JP2008238114A - Co2 recovery apparatus and recovery method of co2 absorption solution - Google Patents

Co2 recovery apparatus and recovery method of co2 absorption solution Download PDF

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JP2008238114A
JP2008238114A JP2007085465A JP2007085465A JP2008238114A JP 2008238114 A JP2008238114 A JP 2008238114A JP 2007085465 A JP2007085465 A JP 2007085465A JP 2007085465 A JP2007085465 A JP 2007085465A JP 2008238114 A JP2008238114 A JP 2008238114A
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exhaust gas
demister
washing
recovery
mist
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JP4831834B2 (en
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Yuji Tanaka
裕士 田中
Toru Takashina
徹 高品
Takuya Hirata
琢也 平田
Masaki Iijima
正樹 飯嶋
Takashi Yoshiyama
隆士 吉山
Goji Oishi
剛司 大石
Takahito Yonekawa
隆仁 米川
Tomio Mimura
富雄 三村
Yasuyuki Yagi
靖幸 八木
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Kansai Electric Power Co Inc
Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a CO<SB>2</SB>recovery apparatus for reducing the discharge amount of a CO<SB>2</SB>absorption solution accompanying a CO<SB>2</SB>removal exhaust gas, reducing CO<SB>2</SB>absorption solution components supplied to a lean solution and improving the recovery efficiency of the CO<SB>2</SB>absorption solution further, and a recovery method of CO<SB>2</SB>absorption solution. <P>SOLUTION: The CO<SB>2</SB>recovery apparatus 10A relating to this embodiment has an absorption tower 1006 for removing CO<SB>2</SB>from a CO<SB>2</SB>-containing gas 1002A and a regeneration tower 1007 for regenerating a rich solution 1008 and reuses the lean solution 1009 from which CO<SB>2</SB>is removed in the regeneration tower 1007 in the absorption tower 1006. A demister 1015 for water flush disposed to the absorption tower 1006 is a demister composed of an at least two-layer structure of high pressure loss, and the catching efficiency of CO<SB>2</SB>absorption solution mist and washing water mist accompanying the CO<SB>2</SB>removal exhaust gas 1002B is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ＣＯ2除去排ガスに同伴するＣＯ2吸収液の放出量を軽減しＣＯ2吸収液の回収効率の向上を図ったＣＯ2回収装置及びＣＯ2吸収液回収方法に関する。 The present invention relates to a CO 2 recovery apparatus and a CO 2 absorbing solution recovery method with improved recovery efficiency and reduce emissions of CO 2 absorbing solution accompanying the CO 2 flue gas CO 2 absorbing solution.

近年、地球の温暖化現象の原因の一つとして、ＣＯ2による温室効果が指摘され、地球環境を守る上で国際的にもその対策が急務となってきた。ＣＯ2の発生源としては化石燃料を燃焼させるあらゆる人間の活動分野に及び、その排出抑制への要求が一層強まる傾向にある。これに伴い大量の化石燃料を使用する火力発電所などの動力発生設備を対象に、ボイラの燃焼排ガスをアミン系ＣＯ2吸収液と接触させ、燃焼排ガス中のＣＯ2を除去、回収する方法及び回収されたＣＯ2を大気へ放出することなく貯蔵する方法が精力的に研究されている。 In recent years, the greenhouse effect due to CO 2 has been pointed out as one of the causes of global warming, and countermeasures have become urgent internationally to protect the global environment. The source of CO 2 extends to all human activity fields that burn fossil fuels, and there is a tendency for the demand for emission control to become stronger. Along with this, for a power generation facility such as a thermal power plant that uses a large amount of fossil fuel, a method for removing the CO 2 in the combustion exhaust gas by bringing the combustion exhaust gas of the boiler into contact with the amine-based CO 2 absorbent and recovering it, and A method of storing the recovered CO 2 without releasing it to the atmosphere has been energetically studied.

また、前記のようなＣＯ2吸収液を用い、燃焼排ガスからＣＯ2を除去・回収する工程としては、吸収塔において燃焼排ガスとＣＯ2吸収液とを接触させる工程、ＣＯ2を吸収した吸収液を再生塔において加熱し、ＣＯ2を遊離させると共に吸収液を再生して再び吸収塔に循環して再使用するものが採用されている（例えば、特許文献１参照）。 Moreover, as a process of removing and recovering CO 2 from the combustion exhaust gas using the CO 2 absorption liquid as described above, a process of bringing the combustion exhaust gas and the CO 2 absorption liquid into contact in an absorption tower, an absorption liquid that has absorbed CO 2 Is used in the regeneration tower to liberate CO 2 and regenerate the absorption liquid, which is then recycled to the absorption tower and reused (see, for example, Patent Document 1).

前記従来のＣＯ2回収装置１０００は、図９に示すように、例えばボイラやガスタービン等の産業設備から排出されたＣＯ2を含有するＣＯ2含有排ガス１００２Ａを冷却塔１００４において冷却水１００３によって冷却し、冷却されたＣＯ2含有排ガス１００２Ａを吸収塔１００６においてアルカノールアミンをベースとするＣＯ2吸収液１００５と向流接触し、ＣＯ2含有排ガス１００２Ａ中のＣＯ2はＣＯ2吸収液１００５に吸収され、前記ＣＯ2含有排ガス１００２ＡからＣＯ2を除去する。そして、ＣＯ2を吸収したＣＯ2吸収液（リッチ溶液）１００８は、再生塔１００７においてＣＯ2を放出し、再生塔１００７下部に至る頃には、大部分のＣＯ2が除去され、ＣＯ2吸収液１００５を再生するものである。この再生されたＣＯ2吸収液１００５が再び吸収塔１００６に送給され、再利用されるものである。 As shown in FIG. 9, the conventional CO 2 recovery apparatus 1000 cools CO 2 -containing exhaust gas 1002A containing CO 2 discharged from industrial equipment such as a boiler and a gas turbine with cooling water 1003 in a cooling tower 1004. and, the cooled CO 2 containing exhaust gas 1002A alkanolamine CO 2 absorbing solution 1005 and was brought in countercurrent contact with the base in an absorber 1006, CO 2 in the CO 2 containing exhaust gas 1002A is absorbed into the CO 2 absorbing solution 1005 Then, CO 2 is removed from the CO 2 -containing exhaust gas 1002A. Then, CO 2 absorbent having absorbed CO 2 (rich solution) 1008 releases CO 2 in the regeneration tower 1007, the time to reach the lower regenerator 1007, CO 2 most are removed, CO 2 absorption The liquid 1005 is regenerated. This regenerated CO 2 absorbent 1005 is sent again to the absorption tower 1006 and reused.

この従来のＣＯ2回収装置１０００を用いたＣＯ2回収方法では、まずＣＯ2含有排ガス１００２Ａは、冷却塔１００４において冷却水１００３により冷却された後、前記吸収塔１００６に送給される。 In the CO 2 recovery method using the conventional CO 2 recovery apparatus 1000, the CO 2 -containing exhaust gas 1002A is first cooled by the cooling water 1003 in the cooling tower 1004 and then sent to the absorption tower 1006.

前記吸収塔１００６において、ＣＯ2含有排ガス１００２Ａは、吸収塔１００６の下部側に設けられたＣＯ2回収部１０１０で、液分散器であるノズル１０１１−１から供給されるＣＯ2吸収液１００５と向流接触し、ＣＯ2含有排ガス１００２Ａ中のＣＯ2は、例えば、化学反応（Ｒ−ＮＨ2＋Ｈ2Ｏ＋ＣＯ2→Ｒ−ＮＨ3ＨＣＯ3）によりＣＯ2吸収液１００５に吸収される。そして、ＣＯ2吸収液回収用デミスタ１０１２においてＣＯ2除去後のＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストが除去される。 In the absorption tower 1006, the CO 2 -containing exhaust gas 1002A is directed to the CO 2 absorption liquid 1005 supplied from the nozzle 1011-1 that is a liquid distributor in the CO 2 recovery unit 1010 provided on the lower side of the absorption tower 1006. flow contact, CO 2 in the CO 2 containing exhaust gas 1002A is, for example, is absorbed by the CO 2 absorbing solution 1005 by a chemical reaction (R-NH 2 + H 2 O + CO 2 → R-NH 3 HCO 3). Then, the CO 2 absorbing solution mist in CO 2 flue gas 1002B after CO 2 removal in CO 2 absorbing liquid recovering demister 1012 is removed.

そして、ＣＯ2吸収液ミストが除去された後のＣＯ2除去排ガス１００２Ｂは、水洗部１０１３−１でノズル１０１１−２から供給されるＣＯ2吸収液を含む凝縮水１０１４と気液接触して、ＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液１００５が回収される。
また、凝縮水受部１０１７−１で回収されたＣＯ2吸収液を含む凝縮水１０１４は、第一の循環ラインＬ１を介して送給され、水洗部１０１３−１の洗浄水として再利用され、前記ＣＯ2吸収液を含む凝縮水１０１４の余剰分は、吸収塔１００６下部に第一の保留水排出ラインＬ２を介して排出される。 The CO 2 removal exhaust gas 1002B after the CO 2 absorption liquid mist is removed comes into gas-liquid contact with the condensed water 1014 containing the CO 2 absorption liquid supplied from the nozzle 1011-2 in the water washing section 1013-1. CO 2 -absorbing solution 1005 accompanying the CO 2 flue gas 1002B is recovered.
Further, the condensed water 1014 containing the CO 2 absorbing liquid recovered by the condensed water receiving unit 1017-1 is supplied via the first circulation line L1, and is reused as the washing water of the water washing unit 1013-1. A surplus of the condensed water 1014 containing the CO 2 absorbent is discharged to the lower part of the absorption tower 1006 via the first reserved water discharge line L2.

そして、水洗用デミスタ１０１５−１でＣＯ2吸収液除去排ガス１００２Ｃ中の洗浄水ミストが除去される。その後、水洗部１０１３−２で、ＣＯ2吸収液除去排ガス１００２ＣはＣＯ2吸収液回収用水１０１６と気液接触し、ＣＯ2吸収液除去排ガス１００２Ｃ中に残存するＣＯ2吸収液１００５が回収される。 Then, the washing water mist in the CO 2 absorbent removal exhaust gas 1002C is removed by the washing demister 1015-1. Then, in the washing unit 1013-2, the CO 2 absorbing liquid removing gas 1002C is gas-liquid contact with CO 2 absorbing liquid collecting water 1016, the CO 2 absorbing solution 1005 remaining in the CO 2 absorbing solution removed exhaust gas 1002C is recovered .

凝縮水受部１０１７−２で回収されたＣＯ2吸収液を含む凝縮水１０１４は第二の循環ラインＬ３を介して送給され、ＣＯ2吸収液回収用水１０１６として再利用される。また、前記ＣＯ2吸収液を含む凝縮水１０１４の余剰分は、凝縮水受部１０１７−１に第二の保留水排出ラインＬ４を介して送給されＣＯ2吸収液ミストを回収するために利用される。 Condensed water 1014 containing the CO 2 absorbing liquid recovered by the condensed water receiving unit 1017-2 is fed through the second circulation line L 3 and reused as CO 2 absorbing liquid recovery water 1016. Further, the surplus of the condensed water 1014 containing the CO 2 absorbent is supplied to the condensed water receiver 1017-1 through the second reserved water discharge line L4 and used to collect the CO 2 absorbent mist. Is done.

そして、水洗用デミスタ１０１５−２で、ＣＯ2吸収液除去排ガス１００２Ｃ中の洗浄水ミストが除去される。その後、吸収塔１００６の頂部からＣＯ2吸収液１００５の除去されたＣＯ2吸収液除去排ガス１００２Ｃが排出される。 Then, the washing water mist in the CO 2 absorbent removal exhaust gas 1002C is removed by the washing demister 1015-2. Thereafter, the CO 2 absorbent-removed exhaust gas 1002C from which the CO 2 absorbent 1005 has been removed is discharged from the top of the absorption tower 1006.

また、リッチ溶液１００８は、リッチ・リーン溶液熱交換器１０１６において、再生塔１００７で再生されたリーン溶液１００９により加熱され、再生塔１００７に供給される。再生塔１００７内部に供給されたリッチ溶液１００８は、吸熱により、大部分のＣＯ2を放出する。再生塔１００７内で一部のＣＯ2を放出したＣＯ2吸収液１００５は「セミリーン溶液」と呼称される。この図示しないセミリーン溶液は、再生塔１００７底部に至る頃には、大部分のＣＯ2が除去されたリーン溶液１００９となる。このリーン溶液１００９は再生加熱器１０３０で飽和スチーム１０３１により加熱される。 The rich solution 1008 is heated by the lean solution 1009 regenerated in the regeneration tower 1007 in the rich / lean solution heat exchanger 1016 and supplied to the regeneration tower 1007. The rich solution 1008 supplied into the regeneration tower 1007 releases most of CO 2 due to endotherm. The CO 2 absorbent 1005 from which a part of CO 2 has been released in the regeneration tower 1007 is referred to as a “semi-lean solution”. This semi-lean solution (not shown) becomes a lean solution 1009 from which most of the CO 2 has been removed by the time it reaches the bottom of the regeneration tower 1007. The lean solution 1009 is heated by the saturated steam 1031 in the regenerative heater 1030.

一方、再生塔１００７の塔頂部からは塔内においてリッチ溶液１００８及び図示しないセミリーン溶液から水蒸気を伴ったＣＯ2ガス１０２０が放出される。そして、水蒸気を伴ったＣＯ2ガス１０２０は、コンデンサ１０２１により水蒸気が凝縮され、分離ドラム１０２２にて水が分離された後、ＣＯ2ガス１０２３が系外に放出されて回収される。分離ドラム１０２２にて分離された水は再生塔１００７の上部に供給される。また残りの水はＣＯ2吸収液回収用水１０１６として水洗部１０１３−２の頂部に供給され、ＣＯ2吸収液除去排ガス１００２Ｃに残存するＣＯ2吸収液１００５を吸収する。 On the other hand, from the top of the regeneration tower 1007, CO 2 gas 1020 with water vapor is released from the rich solution 1008 and a semi-lean solution (not shown) in the tower. The CO 2 gas 1020 accompanied by water vapor is condensed by the condenser 1021 and water is separated by the separation drum 1022, and then the CO 2 gas 1023 is discharged out of the system and collected. The water separated by the separation drum 1022 is supplied to the upper part of the regeneration tower 1007. The remaining water is fed to the top of the washing unit 1013-2 as the CO 2 absorbing liquid collecting water 1016, to absorb CO 2 absorbing solution 1005 remaining in the CO 2 absorbing liquid removing gas 1002C.

尚、図９中、前記ＣＯ2回収装置１０００は、既設の排ガス源からＣＯ2を回収するために後付で設けられる場合と、新設排ガス源に同時付設される場合とがある。 In FIG. 9, the CO 2 recovery device 1000 may be retrofitted for recovering CO 2 from an existing exhaust gas source, or may be simultaneously attached to a new exhaust gas source.

このように、前記従来のＣＯ2回収装置１０００では、ＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液１００５を回収し、吸収塔１００６から排出されるＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液１００５の放出量を軽減していた。 Thus, the in the conventional CO 2 recovery system 1000, to recover the CO 2 -absorbing solution 1005 accompanying the CO 2 flue gas 1002B, CO 2 absorption in the CO 2 absorbing solution removed exhaust gas 1002C discharged from the absorption tower 1006 The amount of liquid 1005 released was reduced.

特開２００２−１２６４３９号公報JP 2002-126439 A

しかしながら、前記従来のＣＯ2回収装置１０００では、例えば水洗用デミスタ１０１５−１において、ＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液ミスト及び洗浄水ミストが十分に回収されず、ＣＯ2吸収液１００５の損失を非常に低いレベルに低減できない場合があり、吸収塔１００６からＣＯ2吸収液除去排ガス１００２Ｃに同伴して放出されるＣＯ2吸収液１００５の放出量を十分に削減できない場合がある、という問題がある。 However, the in the conventional CO 2 recovery system 1000, for example, in a water washing demister 1015-1, CO 2 absorbing solution mist and washing water mist accompanying the CO 2 flue gas 1002B is not sufficiently recovered, CO 2 -absorbing solution 1005 The loss of CO 2 absorbent 1005 released from the absorption tower 1006 along with the CO 2 absorbent removal exhaust gas 1002C may not be sufficiently reduced. There's a problem.

また、ＣＯ2吸収液除去排ガス１００２Ｃに同伴してＣＯ2吸収液１００５が放出されることで、リーン溶液１００９にアミン等のＣＯ2吸収液１００５を別途更に補う必要がある、という問題がある。 Further, there is a problem that it is necessary to separately supplement the lean solution 1009 with a CO 2 absorbing solution 1005 such as amine separately from the CO 2 absorbing solution 1005C by being discharged with the CO 2 absorbing solution removing exhaust gas 1002C.

本発明は、前記問題に鑑み、ＣＯ2除去排ガスに同伴するＣＯ2吸収液の放出量を軽減する共に、リーン溶液に供給するＣＯ2吸収液成分を軽減し、ＣＯ2吸収液の回収効率を一層向上させたＣＯ2回収装置及びＣＯ2吸収液回収方法を提供することを課題とする。 In view of the above-mentioned problems, the present invention reduces the amount of CO 2 absorbing liquid released along with CO 2 removal exhaust gas, reduces the CO 2 absorbing liquid component supplied to the lean solution, and improves the recovery efficiency of the CO 2 absorbing liquid. It is an object of the present invention to provide a further improved CO 2 recovery device and CO 2 absorbent recovery method.

上述した課題を解決するための本発明の第１の発明は、ＣＯ2を含有する排ガスとＣＯ2吸収液とを接触させて前記排ガス中のＣＯ2を吸収するＣＯ2回収部と、前記ＣＯ2回収部の上段側に配設され、ＣＯ2を除去したＣＯ2除去排ガスを冷却すると共に、同伴するＣＯ2吸収液を回収する少なくとも一つ以上の水洗部と、前記ＣＯ2回収部の上段側に配設され、前記ＣＯ2除去排ガスに同伴するＣＯ2吸収液ミストを除去するＣＯ2吸収液回収用デミスタと、前記水洗部の上段側に配設され、前記ＣＯ2除去排ガスに同伴する洗浄水ミストを除去する少なくとも一つ以上の水洗用デミスタと、前記各水洗部の下方側に配設され、前記各水洗部内の凝縮水を回収する凝縮水受部とを有してなる吸収塔と、ＣＯ2を吸収したリッチ溶液を再生し熱交換する再生塔と、該再生塔でＣＯ2を除去したリーン溶液を前記吸収塔で再利用するＣＯ2回収装置であって、前記吸収塔に配設された前記水洗用デミスタのうち、前記ＣＯ2除去排ガスが最初に通過する水洗部の上段側に配設された水洗用デミスタが、圧力損失の高い少なくとも二層構造からなるデミスタであることを特徴とするＣＯ2回収装置にある。 The first aspect of the present invention to solve the above problems, and CO 2 recovery unit that absorbs CO 2 in the flue gas by contacting the exhaust gas and the CO 2 absorbing solution containing CO 2, the CO It is disposed on the upper side of the second recovery unit, to cool the CO 2 removal exhaust gas to remove CO 2, and at least one washing unit for recovering entrained CO 2 absorbing solution, the upper of the CO 2 recovery unit A CO 2 absorbent recovery demister that is disposed on the side and removes CO 2 absorbent mist that accompanies the CO 2 removal exhaust gas, and is disposed on the upper side of the washing section and accompanies the CO 2 removal exhaust gas. Absorption tower comprising at least one washing demister for removing washing water mist, and a condensed water receiving part disposed below the respective washing parts and for collecting condensed water in each of the washing parts. And regenerate and heat-exchange the rich solution that has absorbed CO 2 And a CO 2 recovery device that reuses the lean solution from which CO 2 has been removed in the regeneration tower, wherein the CO 2 out of the washing demister disposed in the absorption tower. In the CO 2 recovery apparatus, the flush demister disposed on the upper side of the flush section through which the removed exhaust gas first passes is a demister having at least a two-layer structure with a high pressure loss.

第２の発明は、第１の発明において、前記少なくとも二層構造からなるデミスタの下層部がガラス繊維層であると共に、上層部がワイヤメッシュ層であることを特徴とするＣＯ2回収装置にある。 According to a second aspect of the present invention, there is provided the CO 2 recovery apparatus according to the first aspect, wherein a lower layer portion of the demister having at least a two-layer structure is a glass fiber layer and an upper layer portion is a wire mesh layer. .

第３の発明は、第１の発明において、前記少なくとも二層構造からなるデミスタの上層部及び下層部がワイヤメッシュ層であると共に、前記ワイヤメッシュ層の間の中間層がガラス繊維層であることを特徴とするＣＯ2回収装置にある。 According to a third invention, in the first invention, the upper layer portion and the lower layer portion of the demister having the at least two-layer structure are wire mesh layers, and the intermediate layer between the wire mesh layers is a glass fiber layer. It is in the CO 2 recovery device characterized by this.

第４の発明は、第１乃至第３の何れか一つの発明において、前記少なくとも二層構造からなるデミスタの圧力損失が、５０〜２５０ｍｍＨ2Ｏであることを特徴とするＣＯ2回収装置にある。 A fourth invention is the CO 2 recovery apparatus according to any one of the first to third inventions, wherein the pressure loss of the at least two-layer structure demister is 50 to 250 mmH 2 O. .

第５の発明は、第１乃至第４の何れか一つの発明において、前記ＣＯ2除去排ガスが最初に通過する水洗部に水を供給する第一の液分散器と前記少なくとも二層構造からなるデミスタとの間に配設され、前記ＣＯ2除去排ガスが最初に通過する水洗部の上段側に配設された前記水洗部内の凝縮水を回収する凝縮水受部から供給された排水を導入するチムニートレイを具備してなることを特徴とするＣＯ2回収装置にある。 According to a fifth invention, in any one of the first to fourth inventions, the first liquid disperser for supplying water to the water washing section through which the CO 2 removal exhaust gas first passes and the at least two-layer structure are provided. Drainage supplied from a condensed water receiving unit that collects condensed water in the flushing unit disposed between the demister and disposed on the upper side of the flushing unit through which the CO 2 removal exhaust gas first passes is introduced. A CO 2 recovery device comprising a chimney tray.

第６の発明は、請求項１乃至５の何れか一つのＣＯ2回収装置を用いて、排ガス中のＣＯ2を除去したＣＯ2除去排ガスに同伴する洗浄水ミスト及びＣＯ2吸収液を回収することを特徴とするＣＯ2吸収液回収方法にある。 The sixth aspect of the present invention, using any one of the CO 2 recovery apparatus according to claim 1 to 5, to collect the washing water mist and CO 2 absorbing solution accompanying the CO 2 removal flue gas to remove CO 2 in the exhaust gas The CO 2 absorbent recovering method is characterized by the above.

本発明によれば、前記ＣＯ2除去排ガスが最初に通過する水洗部の上段側に配設したデミスタを少なくとも二層構造からなるものとしているため、ＣＯ2除去排ガスに同伴するＣＯ2吸収液の放出量を軽減しＣＯ2吸収液の回収効率を向上させることができる。
また、ＣＯ2吸収液除去排ガスに同伴して放出されるＣＯ2吸収液を削減することで、
リーン溶液に別途更に補うアミン等のＣＯ2吸収液の供給量を軽減することができる。 According to the present invention, since the demister disposed on the upper stage side of the water washing section through which the CO 2 removal exhaust gas first passes has at least a two-layer structure, the CO 2 absorbing liquid accompanying the CO 2 removal exhaust gas The emission amount can be reduced and the recovery efficiency of the CO 2 absorbent can be improved.
In addition, by reducing the CO 2 absorbing liquid released along with the CO 2 absorbing liquid removal exhaust gas,
It is possible to reduce the supply amount of a CO 2 absorbing solution such as amine that is further supplemented to the lean solution.

以下、この発明につき図面を参照しつつ詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。また、下記実施例における構成要素には、当業者が容易に想定できるもの、あるいは実質的に同一のものが含まれる。   Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

本発明による実施例１に係るＣＯ2回収装置について、図面を参照して説明する。
図１は、本発明の実施例１に係るＣＯ2回収装置の構成を示す概略図であり、図２は、図１中の水洗用デミスタの要部拡大図である。図中、前記図９に示したＣＯ2回収装置と同一構成には同一符号を付して重複した説明は省略する。
図１、２に示すように、本実施例に係るＣＯ2回収装置１０Ａは、ＣＯ2を含有するＣＯ2含有排ガス１００２ＡとＣＯ2吸収液１００５とを接触させて前記ＣＯ2含有排ガス１００２Ａ中のＣＯ2を吸収するＣＯ2回収部１０１０と、前記ＣＯ2回収部１０１０の上段側に配設され、ＣＯ2を除去したＣＯ2除去排ガス１００２Ｂを冷却すると共に、同伴するＣＯ2吸収液を回収する水洗部１０１３と、前記ＣＯ2回収部１０１０の上段側に配設され、前記ＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液ミストを除去するＣＯ2吸収液回収用デミスタ１０１２と、前記水洗部１０１３の上段側に配設され、前記ＣＯ2除去排ガス１００２Ｂに同伴する洗浄水ミストを除去する水洗用デミスタ１０１５Ａと、前記水洗部１０１３の下方側に配設され、前記水洗部１０１３内の凝縮水を回収する凝縮水受部１０１７とを有してなる吸収塔１００６と、ＣＯ2を吸収したリッチ溶液１００８を再生し熱交換する再生塔１００７と、該再生塔１００７でＣＯ2を除去したリーン溶液１００９を前記吸収塔１００６で再利用するＣＯ2回収装置であって、前記吸収塔１００６に配設された前記水洗用デミスタ１０１５Ａが、圧力損失の高い少なくとも二層構造からなるデミスタである。
ここで、本発明におけるＣＯ2吸収液ミストとは、例えばＣＯ2吸収液がアミンと反応して生成されたアミン化合物等をいう。 A CO 2 recovery device according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing a configuration of a CO 2 recovery device according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged view of a main part of the rinsing demister in FIG. In the figure, the same components as those in the CO 2 recovery apparatus shown in FIG.
As shown in FIG. 1, 2, CO 2 recovery apparatus 10A according to the present embodiment, in the CO 2 containing exhaust gas 1002A contacting the CO 2 containing exhaust gas 1002A and CO 2 absorbing solution 1005 containing CO 2 a CO 2 recovery unit 1010 that absorbs CO 2, is disposed on the upper side of the CO 2 recovery unit 1010, to cool the CO 2 flue gas 1002B removing the CO 2, to recover the entrained CO 2 absorbing solution a washing unit 1013, the disposed on the upper side of the CO 2 recovery unit 1010, a CO 2 absorbing liquid recovering demister 1012 to remove the CO 2 absorbing solution mist accompanying the CO 2 flue gas 1002B, the washing unit 1013 It is disposed on the upper side of the rinsing demister 1015A to remove washing water mist accompanying the CO 2 flue gas 1002B, disposed of the lower side of the washing unit 1013 , The absorption tower 1006 made and a condensed-water receiver 1017 for recovering the condensed water in the washing unit 1013, a regeneration tower 1007 for exchanging heat reproduces the rich solution 1008 having absorbed CO 2, regeneration tower A CO 2 recovery device that reuses the lean solution 1009 from which CO 2 has been removed in 1007 in the absorption tower 1006, wherein the washing demister 1015 A disposed in the absorption tower 1006 includes at least two layers with high pressure loss. It is a demister consisting of a structure.
Here, the CO 2 absorbent mist in the present invention refers to, for example, an amine compound produced by reacting the CO 2 absorbent with an amine.

また、本実施例では、前記水洗用デミスタ１０１５Ａの下層部をガラス繊維層１１とすると共に、上層部をワイヤメッシュ層１２としている。これにより、ガス中のミストの捕集効率を向上させることができるため、ＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液ミスト及び洗浄水ミストを高度に回収することができる。 In this embodiment, the lower layer portion of the washing demister 1015A is the glass fiber layer 11, and the upper layer portion is the wire mesh layer 12. Accordingly, it is possible to improve the collection efficiency of mist in the gas, the CO 2 absorbing solution mist and washing water mist accompanying the CO 2 flue gas 1002B can be highly recovered.

この結果、前記水洗部１０１３でのＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液ミストの濃度を低減し、前記水洗部１０１３に送給されるＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストの流入を防止することができる。 As a result, the concentration of CO 2 absorbing solution mist accompanying the CO 2 flue gas 1002B in the water washing section 1013 reduces, the CO 2 absorbing solution mist in CO 2 flue gas 1002B is fed to the washing section 1013 Inflow can be prevented.

また、ＣＯ2除去排ガス１００２Ｂ中のミストには、例えば０．数μｍ〜数十μｍサイズのものが多く、これらのミストは洗浄水として用いる前記ＣＯ2吸収液を含む凝縮水１０１４では十分に回収されない。本実施例のように、水洗用デミスタ１０１５Ａを圧力損失の高い二層構造とすることにより、特に、数μｍサイズのミストも高度に回収することができ、図９に示すような従来のＣＯ2回収装置１０００では除去できなったＣＯ2吸収液ミストも回収することができるため、ミストの捕集効率を向上させることができる。これにより、前記ＣＯ2吸収液除去排ガス１００２Ｃ中に同伴するＣＯ2吸収液ミストの損失の低減を図ることができる。 The mist in the CO 2 removal exhaust gas 1002B is, for example, 0. Many of these have a size of several μm to several tens of μm, and these mists are not sufficiently recovered by the condensed water 1014 containing the CO 2 absorbent used as washing water. As in this embodiment, the washing demister 1015A has a two-layer structure with a high pressure loss, and in particular, a mist having a size of several μm can be highly recovered, and a conventional CO 2 as shown in FIG. Since the CO 2 absorbent mist that could not be removed by the recovery apparatus 1000 can also be recovered, the efficiency of mist collection can be improved. Thus, it is possible to reduce the loss of CO 2 absorbing solution mist entrained in the CO 2 absorbing solution removed exhaust gas 1002C.

また、本発明においては、前記水洗用デミスタ１０１５Ａの圧力損失としては、前記水洗用デミスタ１０１５Ａの圧力損失によるＣＯ2吸収液ミスト回収による効果、前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストの捕集効率の点から、例えば５０〜２５０ｍｍＨ2Ｏとすることが好ましく、更には例えば７５〜１５０ｍｍＨ2Ｏとすることがより好ましい。 In the present invention, as the pressure loss of the rinsing demister 1015A, the water washing demister 1015A effect CO 2 absorbing solution mist recovery by pressure loss, the CO 2 absorbing solution mist of the CO 2 removing exhaust gas 1002B in terms of collection efficiency, for example, preferably to 50~250mmH 2 O, more and more preferably be, for example 75~150mmH 2 O.

図３、４は、二層構造からなるデミスタの圧力損失に対するＣＯ2吸収液除去排ガスに同伴する吸収液ミストとして存在しているアミン化合物のアミン濃度の割合を示す図である。ここで、図３は、二層構造からなるデミスタの圧力損失とＣＯ2吸収液除去排ガス中の吸収液ミストによるアミン濃度の相対比を示す図である。また、図４は、二層構造からなるデミスタの圧力損失とＣＯ2吸収液除去排ガス中のＣＯ2吸収液ミストによるアミン濃度の低減率を示す図である。 FIGS. 3 and 4 are diagrams showing the ratio of the amine concentration of the amine compound existing as the absorbing liquid mist accompanying the CO 2 absorbing liquid-removed exhaust gas with respect to the pressure loss of the demister having a two-layer structure. Here, FIG. 3 is a diagram showing a relative ratio between the pressure loss of the demister having a two-layer structure and the amine concentration by the absorbent mist in the CO 2 absorbent-removed exhaust gas. Further, FIG. 4 is a diagram showing the reduction rate of the amine concentration by the CO 2 absorbing solution mist pressure loss and the CO 2 absorbing liquid removing flue gas demister having a two-layer structure.

図３、４に示すように、前記二層構造からなるデミスタの圧力損失が大きくなるに従って、前記ＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液ミストのアミン濃度は低くなり、前記ＣＯ2吸収液除去排ガス１００２Ｃ中のアミン濃度低減率が増大することが確認された。 As shown in FIGS. 3 and 4, wherein according to the pressure loss of the demister made of two-layer structure is increased, the concentration of amine CO 2 absorbing solution mist of the CO 2 absorbing solution removed exhaust gas 1002C is low, the CO 2 absorption It was confirmed that the amine concentration reduction rate in the liquid removal exhaust gas 1002C increases.

また、前記二層構造からなるデミスタの圧力損失が例えば５０ｍｍＨ2Ｏ未満では、前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストのアミン濃度が高くなり、前記ＣＯ2除去排ガス１００２Ｂ中のアミン濃度低減率が急激に悪化することが確認された。 Further, in the below two-layer structure consisting of the demister of the pressure loss, for example, 50 mm H 2 O, the CO 2 removal, the higher the CO 2 concentration of amine absorbing solution mist in the exhaust gas 1002B, amine concentration of the CO 2 removing exhaust gas 1002B It was confirmed that the reduction rate deteriorated rapidly.

これは、前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストは前記二層構造からなるデミスタによってＣＯ2吸収液ミストは慣性衝突により捕集されるが、このＣＯ2吸収液ミストの粒径別の捕集効率は、圧力損失が小さいと前記二層構造からなるデミスタでのＣＯ2吸収液ミストの捕集効率が低下するためである。
即ち、前記二層構造からなるデミスタでのＣＯ2吸収液ミストの粒径別の捕集効率は、圧力損失に依存し、圧力損失が例えば５０ｍｍＨ2Ｏ未満では、前記二層構造からなるデミスタでのＣＯ2吸収液ミストの捕集効率が急激に悪化するためである。 This is the CO 2 is CO 2 absorbing solution mist in flue gas 1002B is CO 2 absorbing solution mist by the demister made of the two-layered structure is collected by inertial impaction, grain径別the CO 2 absorbing solution mist This is because, when the pressure loss is small, the collection efficiency of the CO 2 absorbent mist in the demister having the two-layer structure is lowered.
That is, the collection efficiency for each particle size of the CO 2 absorbent mist in the demister having the two-layer structure depends on the pressure loss, and when the pressure loss is less than 50 mmH 2 O, for example, This is because the collection efficiency of the CO 2 absorbing liquid mist of the abruptly deteriorates.

また、二層構造からなるデミスタの圧力損失が例えば２５０ｍｍＨ2Ｏを超えると前記ＣＯ2除去排ガス１００２Ｂ中のアミン濃度の減少の効果は低く、前記ＣＯ2吸収液除去排ガス１００２Ｃ中のアミン濃度低減率はそれほど大きく変動しないことが確認された。 Moreover, two-layer pressure loss demister made of the structure and, for example, more than 250mmH 2 O wherein CO 2 effect of reduction in the amine concentration in the flue gas 1002B is low, amine concentration reduction ratio of the CO 2 absorbing solution removed exhaust gas 1002C Was confirmed not to fluctuate so much.

これは、前記二層構造からなるデミスタの圧力損失が上がると、前記二層構造からなるデミスタでの前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストの捕集効率が高くなり、前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストの大部分が回収されているためである。
即ち、前記二層構造からなるデミスタの圧力損失が例えば２５０ｍｍＨ2Ｏを超えると、前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストの大部分が回収されているため、圧力損失をそれ以上昇させても前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストのミスト捕集効率の効果は小さいためである。 This is because when the pressure loss of the demister having the two-layer structure increases, the collection efficiency of the CO 2 absorbent mist in the CO 2 removal exhaust gas 1002B by the demister having the two-layer structure increases, and the CO 2 This is because most of the CO 2 absorbent mist in the removed exhaust gas 1002B is recovered.
That is, when the pressure loss of the demister having the two-layer structure exceeds 250 mmH 2 O, for example, most of the CO 2 absorbing liquid mist in the CO 2 removal exhaust gas 1002B is recovered, so that the pressure loss is further increased. This is because the effect of the mist collection efficiency of the CO 2 absorbent mist in the CO 2 removal exhaust gas 1002B is small.

よって、前記水洗用デミスタ１０１５Ａの圧力損失によるＣＯ2吸収液ミスト回収による効果、前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストの捕集効率の点から、前記水洗用デミスタ１０１５Ａの圧力損失としては、例えば５０〜２５０ｍｍＨ2Ｏとすることが好ましく、更には例えば７５〜１５０ｍｍＨ2Ｏとすることがより好ましい。これにより、前記吸収塔１００６内で前記リーン溶液１００９を用いてＣＯ2を吸収するために補うアミンの添加量を軽減することができる。 Therefore, from the viewpoint of the effect of CO 2 absorbent mist recovery due to the pressure loss of the washing demister 1015A and the collection efficiency of the CO 2 absorbent mist in the CO 2 removal exhaust gas 1002B, the pressure loss of the washing demister 1015A is It is preferably, for example be a 50~250mmH 2 O, more and more preferably be, for example 75~150mmH 2 O. As a result, it is possible to reduce the amount of amine added to absorb CO 2 using the lean solution 1009 in the absorption tower 1006.

また、本実施例においては、水洗用デミスタ１０１５Ａ−１の構成は二層構造に限定されるものではなく、三層以上としてもよい。例えば図５に示すように水洗用デミスタ１０１５Ｂは、水洗用デミスタ１０１５Ｂの上層部及び下層部を二つのワイヤメッシュ層１２とし、二つの前記ワイヤメッシュ層１２の間の中間層をガラス繊維層１１としてもよい。   In the present embodiment, the configuration of the washing demister 1015A-1 is not limited to the two-layer structure, and may be three or more layers. For example, as shown in FIG. 5, the rinsing demister 1015B includes an upper layer portion and a lower layer portion of the rinsing demister 1015B as two wire mesh layers 12, and an intermediate layer between the two wire mesh layers 12 as a glass fiber layer 11. Also good.

また、図６は、本実施例の他の変形例であり、吸収塔に水洗用デミスタを二つ配設したものである。
図６に示すように、本実施例に係るＣＯ2回収装置１０Ｂは、前記吸収塔１００６に水洗部１０１３−１、１０１３−２と、前記水洗用デミスタ１０１５Ａ−１、１０１５−２とをそれぞれ二つ配設している。これら二つの前記水洗用デミスタ１０１５Ａ−１、１０１５−２のうち、前記ＣＯ2除去排ガスが最初に通過する水洗部１０１３−１の上段側に配設された水洗用デミスタ１０１５Ａ−１を圧力損失の高い少なくとも二層構造からなるデミスタを配設してなるものである。 FIG. 6 shows another modification of this embodiment, in which two rinsing demisters are arranged in an absorption tower.
As shown in FIG. 6, the CO 2 recovery apparatus 10B according to the present embodiment includes two water washing units 1013-1 and 1013-3 and two water washing demisters 1015A-1 and 1015-2 in the absorption tower 1006, respectively. One is arranged. Of these two washing demisters 1015A-1 and 1015-2, the washing demister 1015A-1 disposed on the upper side of the washing unit 1013-1 through which the CO 2 removal exhaust gas first passes is reduced in pressure loss. A high demister having at least a two-layer structure is provided.

前記吸収塔１００６に水洗部１０１３−１、１０１３−２と、前記水洗用デミスタ１０１５Ａ−１、１０１５−２とをそれぞれ二つ配設することにより、更に前記ＣＯ2除去排ガス１００２Ｂ及び前記ＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液ミストの捕集効率を上昇させることができるため、前記ＣＯ2吸収液除去排ガス１００２Ｃ中に同伴するＣＯ2吸収液ミストの損失を低減することができる。 By arranging two washing sections 1013-1 and 1013-2 and two washing demisters 1015A-1 and 1015-2 in the absorption tower 1006, the CO 2 removal exhaust gas 1002B and the CO 2 absorption are further provided. it is possible to increase the collection efficiency of the CO 2 absorbing solution mist in a liquid flue gas 1002C, it is possible to reduce the loss of CO 2 absorbing solution mist entrained in the CO 2 absorbing solution removed exhaust gas 1002C.

また、ＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液ミストのアミン濃度については、従来のＣＯ2回収装置１０００では、前記水洗部１０１３−１から排出されるＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液ミストのアミン濃度が例えば１６ｐｐｍで、前記水洗部１０１３−２から排出されるＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液ミストのアミン濃度は例えば３ｐｐｍであり、前記水洗部１０１３−２で洗浄水として用いられる前記ＣＯ2吸収液を含む凝縮水１０１４中のアミン濃度は、前記水洗部１０１３−１でのＣＯ2吸収液を含む凝縮水１０１４中のアミン濃度に比べて１桁程度低い。このとき、実施例に係るＣＯ2回収装置１０Ｂでは、前記水洗部１０１３−１から排出されるＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液ミストのアミン濃度が例えば９ｐｐｍとなり、前記水洗部１０１３−２から排出されるＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液ミストのアミン濃度が例えば２ｐｐｍとなる。 Also, the amine concentration of the CO 2 absorbing solution mist in CO 2 absorbing solution removed exhaust gas 1002C, the conventional CO 2 recovery system 1000, and the CO 2 absorption liquid removing exhaust gas 1002C discharged from the washing unit 1013-1 CO 2 absorbing solution amine concentration is, for example, 16ppm of the mist, the amine concentration of CO 2 absorbing solution mist is the CO 2 absorbing solution removed exhaust gas 1002C discharged from the washing unit 1013-2 is 3ppm for example, the washing unit 1013 The amine concentration in the condensed water 1014 containing the CO 2 absorbing solution used as the washing water in -2 is one digit compared to the amine concentration in the condensed water 1014 containing the CO 2 absorbing solution in the washing unit 1013-1. About low. At this time, the CO 2 recovery apparatus 10B according to the embodiment, is the CO 2 absorbing solution removed exhaust gas 1002C CO 2 absorbing solution amine concentration is, for example 9ppm next mist in the exhaust from the water-washing section 1013-1, the washing unit 1013 The amine concentration of the CO 2 absorbing liquid mist in the CO 2 absorbing liquid removing exhaust gas 1002C discharged from -2 is 2 ppm, for example.

そのため、従来のＣＯ2回収装置１０００を用いれば吸収塔１００６から排出されるＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液ミストのアミン濃度が例えば３ｐｐｍであったのに対し、本実施例に係るＣＯ2回収装置１０Ｂでは、吸収塔１００６から排出されるＣＯ2吸収液除去排ガス１００２Ｃ中のＣＯ2吸収液ミストのアミン濃度が例えば２ｐｐｍにまで低減することができる。 Therefore, when the conventional CO 2 recovery apparatus 1000 is used, the amine concentration of the CO 2 absorbing liquid mist in the CO 2 absorbing liquid-removed exhaust gas 1002C discharged from the absorption tower 1006 is 3 ppm, for example. in accordance CO 2 recovery apparatus 10B, it is possible that the CO 2 concentration of amine absorbing solution mist in CO 2 absorbing solution removed exhaust gas 1002C discharged from the absorption tower 1006 is reduced for example down to 2 ppm.

本実施例に係るＣＯ2回収装置１０Ｂは、前記水洗用デミスタ１０１５Ａ−１を二層構造からなるデミスタとし、前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストの捕集効率を上昇させることができるため、前記水洗用デミスタ１０１５Ａ−１の圧力損失を例えば７５ｍｍＨ2Ｏとすると、図９に示すような従来のＣＯ2回収装置１０００に比べて、前記ＣＯ2吸収液除去排ガス１００２Ｃ中に同伴するＣＯ2吸収液ミストの損失を例えば４０％程度の低減を図ることができる。 In the CO 2 recovery apparatus 10B according to the present embodiment, the washing demister 1015A-1 is a demister having a two-layer structure, and the collection efficiency of the CO 2 absorbent mist in the CO 2 removal exhaust gas 1002B can be increased. Therefore, if the pressure loss of the rinsing demister 1015A-1 is, for example, 75 mmH 2 O, it is accompanied in the CO 2 absorbent removal exhaust gas 1002C as compared with the conventional CO 2 recovery apparatus 1000 as shown in FIG. The loss of the CO 2 absorbent mist can be reduced by about 40%, for example.

また、本実施例に係るＣＯ2回収装置１０Ｂにおいて、前記水洗用デミスタ１０１５Ａ−１の圧力損失を例えば１７５ｍｍＨ2Ｏとすると、図９に示すような従来のＣＯ2回収装置１０００に比べて、前記ＣＯ2吸収液除去排ガス１００２Ｃ中に同伴するＣＯ2吸収液ミストの損失を例えば８０％程度の低減を図ることができる。 Further, in the CO 2 recovery apparatus 10B according to the present embodiment, when the pressure loss of the rinsing demister 1015A-1 is 175 mmH 2 O, for example, compared to the conventional CO 2 recovery apparatus 1000 as shown in FIG. loss of CO 2 absorbing solution mist entrained in the CO 2 absorbing liquid removing gas 1002C can be achieved, for example, of about 80% reduction.

このように、本実施例に係るＣＯ2回収装置１０Ａ、１０Ｂによれば、前記水洗用デミスタ１０１５Ａ、１０１５Ａ−１の下層部をガラス繊維層１１とし、上層部をワイヤメッシュ層１２とした二層構造からなるデミスタを配設することにより、ＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液ミスト及び洗浄水ミストを高度に回収することができると共に、前記水洗部１０１３−２でのＣＯ2吸収液除去排ガス１００２Ｃに同伴するＣＯ2吸収液ミストの濃度を低減することができる。この結果、前記水洗用デミスタ１０１５Ａ、１０１５Ａ−１のＣＯ2吸収液ミストの捕集効果と前記水洗部１０１３−２でのＣＯ2吸収液ミストの低濃度維持効果との相乗作用により、更に効果的に前記ＣＯ2吸収液除去排ガス１００２Ｃ中に同伴するＣＯ2吸収液の損失の低減を図ることができる。 As described above, according to the CO 2 recovery apparatuses 10A and 10B according to the present embodiment, the two-layer structure in which the lower layer portion of the washing demisters 1015A and 1015A-1 is the glass fiber layer 11 and the upper layer portion is the wire mesh layer 12. By disposing the demister having the structure, the CO 2 absorbent mist and the washing water mist accompanying the CO 2 removal exhaust gas 1002B can be highly recovered, and the CO 2 absorbent in the washing section 1013-2. The concentration of the CO 2 absorbent mist accompanying the removed exhaust gas 1002C can be reduced. As a result, the synergistic effect of the CO 2 absorbing solution mist collecting effect of the washing demisters 1015A and 1015A-1 and the low concentration maintaining effect of the CO 2 absorbing solution mist in the washing unit 1013-2 is further effective. Further, it is possible to reduce the loss of the CO 2 absorbing liquid accompanying the CO 2 absorbing liquid removing exhaust gas 1002C.

本発明による実施例２に係るＣＯ2回収装置について、図面を参照して説明する。
図７は、本実施例に係るＣＯ2回収装置の構成を示す概略図であり、図８は、図７中の一方の水洗用デミスタの要部拡大図である。
また、本実施例では、実施例１に係る他の変形例である図６に示すＣＯ2回収装置１０Ｂを用いて説明する。本実施例に係るＣＯ2回収装置は、実施例１に係るＣＯ2回収装置の構成と同様であるため、同一部材には同一の符号を付して重複した説明は省略する。
図７、８に示すように、本実施例に係るＣＯ2回収装置１０Ｃは、実施例１に係るＣＯ2回収装置１０Ｂの前記ＣＯ2除去排ガスが最初に通過する水洗部１０１３−１に水を供給するノズル１０１１−２と前記水洗用デミスタ１０１５Ａ−１との間に、前記水洗部１０１３−２内の凝縮水１０１４を回収する凝縮水受部１０１７−２から供給された排水を導入するチムニートレイ２０を配設してなるものである。 A CO 2 recovery device according to a second embodiment of the present invention will be described with reference to the drawings.
FIG. 7 is a schematic view showing the configuration of the CO 2 recovery device according to the present embodiment, and FIG. 8 is an enlarged view of a main part of one of the water washing demisters in FIG.
Further, in the present embodiment, description will be made using a CO 2 recovery device 10B shown in FIG. 6 which is another modified example according to the first embodiment. Since the CO 2 recovery apparatus according to the present embodiment is the same as the configuration of the CO 2 recovery apparatus according to the first embodiment, the same reference numerals are given to the same members, and duplicate descriptions are omitted.
As shown in FIGS. 7 and 8, the CO 2 recovery apparatus 10C according to the present embodiment supplies water to the water washing section 1013-1 through which the CO 2 removal exhaust gas of the CO 2 recovery apparatus 10B according to the first embodiment first passes. A chimney tray that introduces the wastewater supplied from the condensed water receiving unit 1017-2 that collects the condensed water 1014 in the washing unit 1013-2 between the nozzle 1011-2 to be supplied and the washing demister 1015A-1. 20 is provided.

本実施例に係るＣＯ2回収装置１０Ｃでは、前記ノズル１０１１−２と前記水洗用デミスタ１０１５Ａ−１との間に前記チムニートレイ２０を配設し、前記水洗部１０１３−２内の凝縮水１０１４を回収する凝縮水受部１０１７−２から供給された凝縮水１０１４を凝縮水排出ラインＬ５を介して前記チムニートレイ２０に送給するようにしている。前記チムニートレイ２０に溜めた前記ＣＯ2吸収液を含む凝縮水１０１４とＣＯ2除去排ガス１００２Ｂとを気液接触させることにより、ＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液ミストを回収することができる。これにより、ＣＯ2吸収液ミストの捕集効率を向上させることができる。 In the CO 2 recovery apparatus 10C according to the present embodiment, the chimney tray 20 is disposed between the nozzle 1011-2 and the rinsing demister 1015A-1, and the condensed water 1014 in the rinsing unit 1013-2 is supplied. The condensed water 1014 supplied from the collected condensed water receiving part 1017-2 is fed to the chimney tray 20 via the condensed water discharge line L5. By gas-liquid contact with condensed water 1014 and CO 2 flue gas 1002B containing the CO 2 absorbing liquid that has accumulated in the chimney tray 20, it is possible to recover the CO 2 absorbing solution mist accompanying the CO 2 flue gas 1002B it can. Thus, it is possible to improve the collection efficiency of the CO 2 absorbing solution mist.

本実施例に係るＣＯ2回収装置１０Ｃは、前記チムニートレイ２０で前記ＣＯ2除去排ガス１００２Ｂ中のＣＯ2吸収液ミストの捕集効率を上昇させることができるため、前記水洗用デミスタ１０１５Ａ−１の圧力損失を例えば１１０ｍｍＨ2Ｏとすると、図９に示すような従来のＣＯ2回収装置１０００に比べて前記ＣＯ2吸収液除去排ガス１００２Ｃ中に同伴するＣＯ2吸収液ミストの損失を例えば８０％程度の低減を図ることができ、実施例１に係るＣＯ2回収装置１０Ｂに比べて前記ＣＯ2吸収液除去排ガス１００２Ｃ中に同伴するＣＯ2吸収液ミストの損失を例えば４０％程度の低減を図ることができる。 Since the CO 2 recovery apparatus 10C according to the present embodiment can increase the collection efficiency of the CO 2 absorbent mist in the CO 2 removal exhaust gas 1002B by the chimney tray 20, the washing demister 1015A-1 When the pressure loss e.g. 110mmH 2 O, the CO 2 absorbing solution removed exhaust gas 1002C loss, for example, about 80% of the entrained CO 2 absorbing solution mist in compared with the conventional CO 2 recovery system 1000 as shown in FIG. 9 reduction can be achieved in, achieving the CO 2 absorbing solution removed exhaust gas 1002C entrained CO 2 absorbing solution reduces the loss of, for example, about 40% of the mist in compared to the CO 2 recovery apparatus 10B according to embodiment 1 Can do.

このように、本実施例に係るＣＯ2回収装置１０Ｃによれば、前記ノズル１０１１−２と前記水洗用デミスタ１０１５Ａ−１との間にチムニートレイ２０を配設することにより、ＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液ミスト及び洗浄水ミストを回収することができるため、前記水洗部１０１３−２でのＣＯ2除去排ガス１００２Ｂに同伴するＣＯ2吸収液ミストの濃度を更に低減し、吸収塔１００６から排出されるＣＯ2吸収液ミストの損失の低減を図ることができる。 As described above, according to the CO 2 recovery apparatus 10C according to the present embodiment, the chimney tray 20 is disposed between the nozzle 1011-2 and the rinsing demister 1015A-1, thereby removing the CO 2 removal exhaust gas 1002B. Since the CO 2 absorbent mist and the washing water mist accompanying the water can be recovered, the concentration of the CO 2 absorbent mist accompanying the CO 2 removal exhaust gas 1002B in the water washing section 1013-2 is further reduced, and the absorption tower The loss of the CO 2 absorbent mist discharged from 1006 can be reduced.

以上のように、本発明に係るＣＯ2回収装置及びＣＯ2吸収液回収方法は、ＣＯ2除去排ガスが最初に通過する水洗部の上段側に配設したデミスタを圧力損失の高い少なくとも二層構造からなるものとし、ＣＯ2除去排ガスに同伴するＣＯ2吸収液の回収効率を向上させることができるため、ＣＯ2吸収液除去排ガスに同伴して放出されるＣＯ2吸収液の低減を図ったＣＯ2回収装置のＣＯ2除去排ガス中のＣＯ2吸収液の回収処理に用いて適している。 As described above, the CO 2 recovery device and the CO 2 absorbing liquid recovery method according to the present invention include at least a two-layer structure in which the demister disposed on the upper side of the water washing section through which the CO 2 removal exhaust gas first passes has a high pressure loss. It consisted of, since it is possible to improve the recovery efficiency of the CO 2 absorbing solution accompanying the CO 2 flue gas was thereby reducing the CO 2 absorbing solution discharged by accompanying the CO 2 absorbing solution removed exhaust gas CO 2 Suitable for use in the recovery process of the CO 2 absorbent in the CO 2 removal exhaust gas of the recovery unit.

本発明の実施例１に係るＣＯ2回収装置の構成を示す概略図である。The structure of the CO 2 recovery apparatus according to a first embodiment of the present invention is a schematic diagram showing. 図１中の水洗用デミスタの要部拡大図である。It is a principal part enlarged view of the demister for water washing in FIG. デミスタでの圧力損失とＣＯ2吸収液除去排ガス中のアミン濃度の相対比を示す図である。It is a diagram illustrating the relative ratio of amine concentration in the pressure loss and the CO 2 absorbing solution removed in the exhaust gas in the demister. デミスタでの圧力損失とＣＯ2吸収液除去排ガス中のアミン濃度の低減率を示す図である。It is a diagram showing the reduction rate of the amine concentration of the pressure loss and the CO 2 absorbing solution removed in the exhaust gas in the demister. 水洗用デミスタの他の構成を示す概略図である。It is the schematic which shows the other structure of the demister for water washing. 本発明の実施例１に係るＣＯ2回収装置の他の変形例の構成を示す概略図である。The configuration of another modification of the CO 2 recovery apparatus according to a first embodiment of the present invention is a schematic diagram showing. 本発明の実施例２に係るＣＯ2回収装置の概略図である。It is a schematic diagram of a CO 2 recovery apparatus according to a second embodiment of the present invention. 図７中の一方の水洗用デミスタの要部拡大図である。FIG. 8 is an enlarged view of a main part of one rinsing demister in FIG. 7. 従来のＣＯ2回収装置の構成を示す概略図である。It is a schematic diagram showing the structure of a conventional CO 2 recovery apparatus.

符号の説明Explanation of symbols

１０Ａ〜１０Ｃ ＣＯ2回収装置
１１ ガラス繊維層
１２ ワイヤメッシュ層
２０ チムニートレイ
１００２Ａ ＣＯ2含有排ガス
１００３ 冷却水
１００４ 冷却塔
１００５ ＣＯ2吸収液
１００６ 吸収塔
１００７ 再生塔
１００８ リッチ溶液
１００９ リーン溶液
１０１０ ＣＯ2回収部
１０１１−１〜１０１１−３ ノズル
１０１２ ＣＯ2吸収液回収用デミスタ
１０１３、１０１３−１、１０１３−２ 水洗部
１０１４ ＣＯ2吸収液を含む凝縮水
１０１５Ａ、１０１５Ａ−１、１０１５Ｂ 第一の水洗用デミスタ
１０１５−２ 第二の水洗用デミスタ
１０１６ ＣＯ2吸収液回収用水
１０１７−１、１０１７−２ 凝縮水受部
１０１８ リーン溶液供給ライン
Ｌ１ 第一の循環ライン
Ｌ２ 第一の保留水排出ライン
Ｌ３ 第二の循環ライン
Ｌ４ 第二の保留水排出ライン
Ｌ５ 凝縮水排出ライン 10A to 10C CO 2 recovery apparatus 11 Glass fiber layer 12 Wire mesh layer 20 Chimney tray 1002A CO 2 -containing exhaust gas 1003 Cooling water 1004 Cooling tower 1005 CO 2 absorbent 1006 Absorption tower 1007 Regeneration tower 1008 Rich solution 1009 Lean solution 1010 CO 2 recovery Part 1011-1 to 1011-3 Nozzle 1012 CO 2 absorbent recovering demister 1013, 1013-1, 1013-2 Washing part 1014 Condensed water containing CO 2 absorbent 1015A, 1015A-1, 1015B First water washing demister 1015-2 Second washing demister 1016 CO 2 absorbent recovery water 1017-1, 1017-2 Condensate receiver 1018 Lean solution supply line L1 First circulation line L2 First reserved water discharge line L3 Second Circulation line L4 2nd Pending water discharge line L5 condensate drain line

Claims (6)

ＣＯ2を含有する排ガスとＣＯ2吸収液とを接触させて前記排ガス中のＣＯ2を吸収するＣＯ2回収部と、前記ＣＯ2回収部の上段側に配設され、ＣＯ2を除去したＣＯ2除去排ガスを冷却すると共に、同伴するＣＯ2吸収液を回収する少なくとも一つ以上の水洗部と、前記ＣＯ2回収部の上段側に配設され、前記ＣＯ2除去排ガスに同伴するＣＯ2吸収液ミストを除去するＣＯ2吸収液回収用デミスタと、前記水洗部の上段側に配設され、前記ＣＯ2除去排ガスに同伴する洗浄水ミストを除去する少なくとも一つ以上の水洗用デミスタと、前記各水洗部の下方側に配設され、前記各水洗部内の凝縮水を回収する凝縮水受部とを有してなる吸収塔と、ＣＯ2を吸収したリッチ溶液を再生し熱交換する再生塔と、該再生塔でＣＯ2を除去したリーン溶液を前記吸収塔で再利用するＣＯ2回収装置であって、
前記吸収塔に配設された前記水洗用デミスタのうち、前記ＣＯ2除去排ガスが最初に通過する水洗部の上段側に配設された水洗用デミスタが、圧力損失の高い少なくとも二層構造からなるデミスタであることを特徴とするＣＯ2回収装置。 And the CO 2 recovery unit that absorbs CO 2 in the flue gas by contacting the exhaust gas and the CO 2 absorbing solution containing CO 2, is disposed on the upper side of the CO 2 recovery unit to remove CO 2 CO with a 2 removed exhaust gas cools, and at least one washing unit for recovering entrained CO 2 absorbing liquid, is disposed on the upper side of the CO 2 recovery unit, the CO 2 absorbing entrained to the CO 2 removing exhaust gas A CO 2 absorbing liquid recovery demister that removes liquid mist, and at least one rinsing demister that is disposed on the upper side of the water washing section and removes the washing water mist accompanying the CO 2 removal exhaust gas, An absorption tower that is disposed below each washing section and has a condensed water receiving section that collects condensed water in each washing section, and a regeneration tower that regenerates and heat-exchanges the rich solution that has absorbed CO 2. When the lean solution obtained by removing CO 2 in the regeneration tower A CO 2 is reused in serial absorption tower,
Of the washing demisters arranged in the absorption tower, the washing demister arranged on the upper side of the washing unit through which the CO 2 removal exhaust gas first passes has at least a two-layer structure with high pressure loss. A CO 2 recovery device characterized by being a demister. 請求項１において、
前記少なくとも二層構造からなるデミスタの下層部がガラス繊維層であると共に、上層部がワイヤメッシュ層であることを特徴とするＣＯ2回収装置。 In claim 1,
A CO 2 recovery device, wherein a lower layer portion of the demister having at least a two-layer structure is a glass fiber layer, and an upper layer portion is a wire mesh layer. 請求項１において、
前記少なくとも二層構造からなるデミスタの上層部及び下層部がワイヤメッシュ層であると共に、前記ワイヤメッシュ層の間の中間層がガラス繊維層であることを特徴とするＣＯ2回収装置。 In claim 1,
The CO 2 recovery device, wherein the upper layer and the lower layer of the at least two-layer demister are wire mesh layers, and the intermediate layer between the wire mesh layers is a glass fiber layer. 請求項１乃至３の何れか一つにおいて、
前記少なくとも二層構造からなるデミスタの圧力損失が、５０〜２５０ｍｍＨ2Ｏであることを特徴とするＣＯ2回収装置。 In any one of Claims 1 thru | or 3,
A CO 2 recovery apparatus, wherein the pressure loss of the demister having at least a two-layer structure is 50 to 250 mmH 2 O. 請求項１乃至４の何れか一つにおいて、
前記ＣＯ2除去排ガスが最初に通過する水洗部に水を供給する第一の液分散器と前記少なくとも二層構造からなるデミスタとの間に配設され、
前記ＣＯ2除去排ガスが最初に通過する水洗部の上段側に配設された前記水洗部内の凝縮水を回収する凝縮水受部から供給された排水を導入するチムニートレイを具備してなることを特徴とするＣＯ2回収装置。 In any one of Claims 1 thru | or 4,
Disposed between a first liquid disperser for supplying water to a water washing section through which the CO 2 removal exhaust gas first passes and a demister having at least a two-layer structure;
A chimney tray for introducing drainage supplied from a condensate receiving unit that collects condensed water in the flushing unit disposed on the upper side of the flushing unit through which the CO 2 removal exhaust gas first passes; Characteristic CO 2 recovery device. 請求項１乃至５の何れか一つのＣＯ2回収装置を用いて、排ガス中のＣＯ2を除去したＣＯ2除去排ガスに同伴する洗浄水ミスト及びＣＯ2吸収液を回収することを特徴とするＣＯ2吸収液回収方法。 Using any one of the CO 2 recovery apparatus according to claim 1 to 5, and recovering the washing water mist and CO 2 absorbing solution accompanying the CO 2 removal flue gas to remove CO 2 in the exhaust gas CO 2 Absorbent recovery method.
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