CN102925219B - Device for resource utilization of circulating fluidized bed coal-gasified discharged ash and use method - Google Patents
Device for resource utilization of circulating fluidized bed coal-gasified discharged ash and use method Download PDFInfo
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- CN102925219B CN102925219B CN201210441315.0A CN201210441315A CN102925219B CN 102925219 B CN102925219 B CN 102925219B CN 201210441315 A CN201210441315 A CN 201210441315A CN 102925219 B CN102925219 B CN 102925219B
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a device for resource utilization of circulating fluidized bed coal-gasified discharged ash. The device comprises a circulating fluidized bed gasification furnace, a primary cyclone separator, a secondary cyclone separator, a first dipleg, a second dipleg, a U-shaped back feeder, an M-shaped back feeder, a primary preheater, a secondary preheater, a third dipleg, a smoke pipe, a rotary furnace and a motor. The circulating fluidized bed gasification furnace is connected with the primary cyclone separator, the primary cyclone separator is connected with the M-shaped back feeder and the secondary cyclone separator, one side of the M-shaped back feeder is connected with the circulating fluidized bed gasification furnace, the other side of the M-shaped back feeder is connected with the rotary furnace, the secondary preheater is connected with the rotary furnace, and the bottom end of the primary preheater is connected inside a cavity of the smoke pipe. The device uses gasified ash content as one of raw materials to prepare cement and achieves comprehensive utilization of the ash content. Simultaneously, the invention discloses a use method of the device. The method is simple, easy to practice and suitable for industrial popularization and application.
Description
Technical field
The present invention relates to the utilization of circulation fluidized bed coal gasifying ash discharge resource, specifically, relate to a kind of device and using method of circulation fluidized bed coal gasifying ash discharge recycling.
Background technology
Coal Gasification Technology refers to reacts with vaporized chemical coal in circulating fluidized bed, thereby produces raw gas, then raw gas purifying is obtained to clean coal gas.This technology has been widely used at present and has developed.In coal gasification course, from angle clean, efficient, recycling, people more and more pay attention to lime-ash how to process its generation.At present a large amount of lime-ash are often still in simple stacking, the state of discharge arbitrarily.Handle these lime-ash well, or even again utilize, turn waste into wealth and just have a very big significance and be worth.
Summary of the invention
Technical problem: technical problem to be solved by this invention is: a kind of device of circulation fluidized bed coal gasifying ash discharge recycling is provided, and this device utilizes the ash content after gasification to produce cement for one of raw material, has realized the comprehensive utilization to ash content.Meanwhile, the present invention also provides the using method of the device of this circulation fluidized bed coal gasifying ash discharge recycling, and the method is simple, is applicable to industrial applying.
Technical scheme: for solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of device of circulation fluidized bed coal gasifying ash discharge recycling, this device comprises circle fluidized-bed gasification furnace, primary cyclone, secondary cyclone, the first dipleg, the second dipleg, U-shaped material returning device, M type material returning device, one-level preheater, secondary preheater, the 3rd dipleg, fume pipe, converter and motor, the lower end of circle fluidized-bed gasification furnace is provided with bunker coal entrance, the bottom of circle fluidized-bed gasification furnace is provided with oxygen and steam-in, the top of secondary cyclone is provided with gas exit, the upper end of one-level preheater is provided with exhanst gas outlet, one side of converter is provided with gas inlet and cement exit,
The top of described circle fluidized-bed gasification furnace is connected with the top of primary cyclone, the bottom of primary cyclone is connected with the top of M type material returning device by the first dipleg, the top of primary cyclone is connected with the top of secondary cyclone, the bottom of secondary cyclone is connected with the top of secondary dipleg, the bottom of secondary dipleg is connected with the bottom of the first dipleg by U-shaped material returning device, M type material returning device both sides are provided with feed back pipe and ash releasing tube, one side of M type material returning device is connected with the bottom of circle fluidized-bed gasification furnace by feed back pipe, the opposite side of M type material returning device is connected by ash releasing tube and converter, the top of secondary preheater is connected with converter by fume pipe, the bottom of secondary preheater is connected with converter by the 3rd dipleg, the top of secondary preheater is connected with the top of one-level preheater by riser tube, riser tube is provided with cement raw material entrance processed, the bottom of one-level preheater is connected in the inner chamber of fume pipe by pipeline.
Further, the device of described circulation fluidized bed coal gasifying ash discharge recycling, also comprises Waste Heat Generation device, and the exhanst gas outlet of described one-level preheater is connected with the gas approach of Waste Heat Generation device.
A using method for the device of above-mentioned circulation fluidized bed coal gasifying ash discharge recycling, the method comprises the following steps:
The first step, drops into coal circle fluidized-bed gasification furnace from the bunker coal entrance of circle fluidized-bed gasification furnace, meanwhile, by oxygen and steam-in, in circle fluidized-bed gasification furnace, passes into oxygen and steam; Coal, oxygen and steam be generating gasification reaction in circle fluidized-bed gasification furnace, and reaction product and unreacted coke rise and enter in primary cyclone;
Second step, in primary cyclone, part of ash separates through primary cyclone with unreacted coke, enters in M type material returning device by the first dipleg; The coke of the ash content that cannot capture in primary cyclone and not complete reaction, through primary cyclone top, is carried secretly and is entered secondary cyclone by the inflammable gas after gasification; Separate through secondary cyclone, isolated raw gas is discharged from gas exit, and ash content and coke import in the first dipleg through the second dipleg, U-shaped material returning device successively, then fall into M type material returning device by the first dipleg;
The 3rd step, solid materials is split into two portions by M type material returning device, and wherein a part of solid materials returns in circle fluidized-bed gasification furnace through feed back pipe, and another part solid materials enters in converter through ash releasing tube;
The 4th step, adds Wingdale and kaolin from cement raw material entrance, after one-level preheater and the preheating of secondary preheater, enter in converter through the 3rd dipleg, enters the ash content acting in conjunction in the solid materials of converter with M type material returning device, makes cement.
Further, the using method of the device of described circulation fluidized bed coal gasifying ash discharge recycling, in the 4th described step, gas inlet to converter passes into air, by the carbon residue after-flame being entered by M type material returning device in the solid materials of converter, the high-temperature flue gas generating enters in secondary preheater via fume pipe, and flue gas is carried Wingdale and kaolin to enter in one-level preheater secretly; In one-level preheater, flue gas carries out heat exchange with Wingdale and kaolin respectively, and then flue gas is discharged from the exhanst gas outlet of one-level preheater, and Wingdale and kaolin fall into fume pipe, and the flue gas of discharging through converter is carried secretly and entered in secondary preheater; In secondary preheater, Wingdale and kaolin carry out heat exchange for the second time with flue gas respectively, and subsequently, flue gas flows in one-level preheater, and Wingdale and kaolin fall into converter through the 3rd dipleg; In converter, burning carbon residue, provides heat for preparing cement, Wingdale, kaolin and entered ash content in the solid materials of converter by M type material returning device and react and make cement clinker, and cement clinker is discharged from the cement exit of converter.
Further, the using method of the device of described circulation fluidized bed coal gasifying ash discharge recycling, also comprises the 5th step, and the flue gas of discharging from exhanst gas outlet is passed into Waste Heat Generation device.
Beneficial effect: compared with prior art, tool of the present invention has the following advantages:
(1) prepare cement with ash content, realized the comprehensive utilization to ash content.After gasification, can discharge flyash, the chemical composition of the most of flyash of China according to mass percent is: 40-60%SiO
2; 0.5-2.5%MgO; 15-40%Al
2o
3; ﹤ 2%SO
3; 3-10%Fe
2o
3; ﹥ 60%SiO
2+ Al
2o
3; 25%CaO; The burning lost article of 1-20%, the unburning material (belonging to harmful part) of 1-6%.Using coal ash as one of cement raw material processed and Wingdale (main component is CaCO
3) and kaolin (Al
2o
32SiO
22H
2o) being placed in together cement converter reacts.Kaolin generation dehydration reaction, sloughs chemically-bonded water wherein, becomes unbodied aluminium sesquioxide and silicon-dioxide Al after dehydration
2o
32SiO
22H
2o → Al
2o
3+ 2SiO
2+ 2H
2o.The magnesiumcarbonate being mingled with in calcium carbonate in Wingdale and raw material decomposes: CaCO
3→ CaO+CO
2; MgCO
3→ MgO+CO
2.These raw materials provide character active free calcium oxide, the SiO in it and raw material
2, Al
2o
3, Fe
2o
3carry out solid state reaction, form clinker mineral: tricalcium silicate (C
3s), Dicalcium Phosphate (Feed Grade) (C
2s), tricalcium aluminate (C
3a), tetracalcium aluminoferrite (C
4aF), these are the essential mineral of cement clinker, thereby make cement.The byproduct that coal ash produces as coal gasification course, has obtained again utilizing, and has improved the utilization ratio of coal.
(2) reduce manufacture of cement cost, reduced the energy consumption of producing cement.The present invention has effectively solved the discharge of gasification lime-ash, has reduced manufacture of cement cost, has reduced the energy consumption of producing cement.Bring new benefit can to gasification manufacturing enterprise, both alleviate the environmental stress that gasification ash content is stacked, disposed as solid waste, reduce again production energy consumption, meet resource reutilization, the development trend of circulating resources.
(3) use of M type material returning device, makes apparatus structure compactness, and one side is provided with feed back pipe, and opposite side is provided with ash releasing tube, has both realized the Matter Transfer of fluidized-bed gasification furnace, again for cement rotary kiln provides raw material.In addition, can regulate ash discharge amount by the air quantity of giving of adjusting material returning device, thereby further regulate and control the ash amount in the residence time and the rotary kiln of material in circulating fluidized bed.
(4) use of two-stage preheater, makes thermal exchange more abundant, both preheating cement raw material Wingdale and kaolin, promote cement to generate, utilized again the heat of high-temperature flue gas.The waste heat of final flue gas is produced electricity by waste heat boiler utilization, has realized fully effectively utilizing of resource.
Accompanying drawing explanation
Fig. 1 is the structural representation of device of the present invention.
Fig. 2 is the structural representation of a modification of the present invention device.
In figure, have: circle fluidized-bed gasification furnace 1, primary cyclone 2, secondary cyclone 3, the first dipleg 4, the second dipleg 5, U-shaped material returning device 6, M type material returning device 7, one-level preheater 801, secondary preheater 802, the 3rd dipleg 9, fume pipe 10, converter 11, riser tube 12, Waste Heat Generation device 13, bunker coal entrance 101, oxygen and steam-in 102, gas exit 301, feed back pipe 701, ash releasing tube 702, exhanst gas outlet 803, gas inlet 1101, cement exit 1102.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail.
As shown in Figure 1, the device of a kind of circulation fluidized bed coal gasifying ash discharge recycling of the present invention, this device comprises circle fluidized-bed gasification furnace 1, primary cyclone 2, secondary cyclone 3, the first dipleg 4, the second dipleg 5, U-shaped material returning device 6, M type material returning device 7, one-level preheater 801, secondary preheater 802, the 3rd dipleg 9, fume pipe 10, converter 11 and motor.The lower end of circle fluidized-bed gasification furnace 1 is provided with bunker coal entrance 101.Coal drops in circle fluidized-bed gasification furnace 1 by bunker coal entrance 101.The bottom of circle fluidized-bed gasification furnace 1 is provided with oxygen and steam-in 102.The top of secondary cyclone 3 is provided with gas exit 301.The upper end of one-level preheater 801 is provided with exhanst gas outlet 803.One side of converter 11 is provided with gas inlet 1101 and cement exit 1102.The top of circle fluidized-bed gasification furnace 1 is connected with the top of primary cyclone 2, the bottom of primary cyclone 2 is connected with the top of M type material returning device 7 by the first dipleg 4, the top of primary cyclone 2 is connected with the top of secondary cyclone 3, the bottom of secondary cyclone 3 is connected with the top of secondary dipleg 5, the bottom of secondary dipleg 5 is connected with the bottom of the first dipleg 4 by U-shaped material returning device 6, M type material returning device 7 both sides are provided with feed back pipe 701 and ash releasing tube 702, one side of M type material returning device 7 is connected with the bottom of circle fluidized-bed gasification furnace 1 by feed back pipe 701, the opposite side of M type material returning device 7 is connected with converter 11 by ash releasing tube 702, the top of secondary preheater 802 is connected with converter 11 by fume pipe 10, the bottom of secondary preheater 802 is connected with converter 11 by the 3rd dipleg 9, the top of secondary preheater 802 is connected with the top of one-level preheater 801 by riser tube 12, riser tube 12 is provided with cement raw material entrance 1201 processed, the bottom of one-level preheater 801 is connected in the inner chamber of fume pipe 10 by pipeline.
Further, as a kind of improvement project, as shown in Figure 2, the device of described circulation fluidized bed coal gasifying ash discharge recycling, also comprise Waste Heat Generation device 13, the exhanst gas outlet 803 of described one-level preheater is connected with the gas approach of Waste Heat Generation device 13.Waste Heat Generation device 13 is existing apparatus, for example, press of Tsing-Hua University 2010.11 publishes, the << combustion gas of Duan Qiusheng work---in steam combined cycle Analysis of Thermodynamic Performance theory and calculating >>, introduce Waste Heat Generation device 13.Waste Heat Generation device 13 comprises the parts such as waste heat boiler, steam turbine, generator and condenser.Waste Heat Generation device 13 utilizes the heat of flue gas in waste heat boiler, to produce steam, and steam enters steam turbine from waste heat boiler, drives generator generating.
The using method of said apparatus, comprises the following steps:
The first step, drops into coal circle fluidized-bed gasification furnace 1 from the bunker coal entrance 101 of circle fluidized-bed gasification furnace 1, meanwhile, by oxygen and steam-in 102, in circle fluidized-bed gasification furnace 1, passes into oxygen and steam; Coal, oxygen and steam are in the interior generating gasification reaction of circle fluidized-bed gasification furnace 1, and reaction product and unreacted coke rise and enter in primary cyclone 2.
In the described the first step, coal, oxygen and steam are at 800-1200 ℃ of temperature, and in the interior generating gasification reaction of circle fluidized-bed gasification furnace 1, gasification reaction product comprises CO2, CO, H2, CH4 etc.After gasification reaction, unreacted coke and ash content are also retained.
Second step, in primary cyclone 2, part of ash separates through primary cyclone 2 with unreacted coke, enters in M type material returning device 7 by the first dipleg 4; In primary cyclone 2, the coke of the ash content that cannot capture and not complete reaction, through primary cyclone 2 tops, is carried secretly and is entered secondary cyclone 3 by the inflammable gas after gasification; Separate through secondary cyclone 3, isolated raw gas is discharged from gas exit 301, and ash content and coke import in the first dipleg 4 through the second dipleg 5, U-shaped material returning device 6 successively, then fall into M type material returning device 7 by the first dipleg 4.
The 3rd step, solid materials is split into two portions by M type material returning device 7, and wherein a part of solid materials is in feed back pipe 701 returns to circle fluidized-bed gasification furnace 1, and another part solid materials enters in converter 11 through ash releasing tube 702.
In the 3rd step, the solid materials in feed back pipe 701 returns to circle fluidized-bed gasification furnace 1, continues to participate in gasification reaction.Solid materials in ash releasing tube 702 enters converter 11, for the preparation of cement.
The 4th step, Wingdale and kaolin are added from cement raw material entrance 1201, after one- level preheater 801 and 802 preheatings of secondary preheater, enter in converter 11 through the 3rd dipleg 9, the ash content entering in the solid materials of converter 11 with M type material returning device 7 burns jointly, makes cement.
In the 4th described step, gas inlet 1101 to converter 11 passes into air, by the carbon residue after-flame being entered by M type material returning device 7 in the solid materials of converter 11, for ash discharge, Wingdale and kaolin cement baking provide heat, the high-temperature flue gas generating enters in secondary preheater 802 via fume pipe 10, and flue gas is carried Wingdale and kaolin to enter in one-level preheater 801 secretly; In one-level preheater 801, flue gas carries out heat exchange with Wingdale and kaolin respectively, then flue gas is discharged from the exhanst gas outlet 803 of one-level preheater 801, and Wingdale and kaolin fall into fume pipe 10, and the flue gas of discharging through converter 11 is carried secretly and entered in secondary preheater 802; In secondary preheater 802, Wingdale and kaolin carry out heat exchange for the second time with flue gas respectively, and subsequently, flue gas flows in one-level preheater 801, and Wingdale and kaolin fall into converter 11 through the 3rd dipleg 9; In converter 11, burning carbon residue, provides heat for preparing cement, Wingdale, kaolin and entered ash content in the solid materials of converter 11 by M type material returning device 7 and react and make cement clinker, and cement clinker is discharged from the cement exit 1102 of converter 11.
Said process is for the preparation of cement.
Further, the method also comprises the 5th step, and flue gas, from exhanst gas outlet 803 is discharged, enters in Waste Heat Generation device 13.The heat generation steam that utilizes flue gas, steam enters steam turbine from waste heat boiler, drives generator generating.This step is for generating.
In said process, converter 11 is in tilted layout, and constantly revolution, and the solid materials in converter 11 is moved to cement exit 1102 directions of converter 11 continuously.This is convenient to cement clinker and discharges from the cement exit 1102 of converter 11.
Claims (6)
1. the device of a circulation fluidized bed coal gasifying ash discharge recycling, it is characterized in that, this device comprises circle fluidized-bed gasification furnace (1), primary cyclone (2), secondary cyclone (3), the first dipleg (4), the second dipleg (5), U-shaped material returning device (6), M type material returning device (7), one-level preheater (801), secondary preheater (802), the 3rd dipleg (9), fume pipe (10), converter (11) and motor, the lower end of circle fluidized-bed gasification furnace (1) is provided with bunker coal entrance (101), the bottom of circle fluidized-bed gasification furnace (1) is provided with oxygen and steam-in (102), the top of secondary cyclone (3) is provided with gas exit (301), the upper end of one-level preheater (801) is provided with exhanst gas outlet (803), one side of converter (11) is provided with gas inlet (1101) and cement exit (1102),
The top of described circle fluidized-bed gasification furnace (1) is connected with the top of primary cyclone (2), the bottom of primary cyclone (2) is connected with the top of M type material returning device (7) by the first dipleg (4), the top of primary cyclone (2) is connected with the top of secondary cyclone (3), the bottom of secondary cyclone (3) is connected with the top of secondary dipleg (5), the bottom of secondary dipleg (5) is connected with the bottom of the first dipleg (4) by U-shaped material returning device (6), M type material returning device (7) both sides are provided with feed back pipe (701) and ash releasing tube (702), one side of M type material returning device (7) is connected with the bottom of circle fluidized-bed gasification furnace (1) by feed back pipe (701), the opposite side of M type material returning device (7) is connected by ash releasing tube (702) and converter (11), the top of secondary preheater (802) is connected with converter (11) by fume pipe (10), the bottom of secondary preheater (802) is connected with converter (11) by the 3rd dipleg (9), the top of secondary preheater (802) is connected with the top of one-level preheater (801) by riser tube (12), riser tube (12) is provided with cement raw material entrance processed (1201), the bottom of one-level preheater (801) is connected in the inner chamber of fume pipe (10) by pipeline.
2. according to the device of circulation fluidized bed coal gasifying ash discharge recycling claimed in claim 1, it is characterized in that, also comprise Waste Heat Generation device (13), the exhanst gas outlet (803) of described one-level preheater is connected with the gas approach of Waste Heat Generation device (13).
3. a using method for the device of circulation fluidized bed coal gasifying ash discharge recycling claimed in claim 1, is characterized in that, the method comprises the following steps:
The first step, drops into coal circle fluidized-bed gasification furnace (1) from the bunker coal entrance (101) of circle fluidized-bed gasification furnace (1), meanwhile, by oxygen and steam-in (102), in circle fluidized-bed gasification furnace (1), passes into oxygen and steam; Coal, oxygen and steam be generating gasification reaction in circle fluidized-bed gasification furnace (1), and reaction product and unreacted coke rise and enter in primary cyclone (2);
Second step, in primary cyclone (2), part of ash separates through primary cyclone (2) with unreacted coke, enters in M type material returning device (7) by the first dipleg (4); The coke of the ash content that cannot capture in primary cyclone (2) and not complete reaction, through primary cyclone (2) top, enters secondary cyclone (3) by the gas entrainment after gasification; Separate through secondary cyclone (3), isolated raw gas is discharged from gas exit (301), ash content and coke import in the first dipleg (4), then fall into M type material returning device (7) by the first dipleg (4) through the second dipleg (5), U-shaped material returning device (6) successively;
The 3rd step, solid materials is split into two portions by M type material returning device (7), and wherein a part of solid materials is in feed back pipe (701) returns to circle fluidized-bed gasification furnace (1), and another part solid materials enters in converter (11) through ash releasing tube (702);
The 4th step, Wingdale and kaolin are added from cement raw material entrance (1201), after one-level preheater (801) and secondary preheater (802) preheating, enter in converter (11) through the 3rd dipleg (9), enter the ash content acting in conjunction in the solid materials of converter (11) with M type material returning device (7), make cement.
4. the using method of the device of circulation fluidized bed coal gasifying ash discharge recycling according to claim 3, it is characterized in that, in the 4th described step, gas inlet (1101) to converter (11) passes into air, to enter the carbon residue after-flame in the solid materials of converter (11) by M type material returning device (7), the high-temperature flue gas generating enters in secondary preheater (802) via fume pipe (10), and flue gas is carried Wingdale and kaolin to enter in one-level preheater (801) secretly; In one-level preheater (801), flue gas carries out heat exchange with Wingdale and kaolin respectively, then flue gas is discharged from the exhanst gas outlet (803) of one-level preheater (801), Wingdale and kaolin fall into fume pipe (10), and the flue gas of discharging through converter (11) is carried secretly and entered in secondary preheater (802); In secondary preheater (802), Wingdale and kaolin carry out heat exchange for the second time with flue gas respectively, and subsequently, flue gas flows in one-level preheater (801), and Wingdale and kaolin fall into converter (11) through the 3rd dipleg (9); In converter (11), burning carbon residue, provide heat for preparing cement, Wingdale, kaolin and entered ash content in the solid materials of converter (11) by M type material returning device (7) and react and make cement clinker, cement clinker is discharged from the cement exit (1102) of converter (11).
5. the using method of the device of circulation fluidized bed coal gasifying ash discharge recycling according to claim 4, is characterized in that, also comprises the 5th step, and the flue gas of discharging from exhanst gas outlet (803) is passed into Waste Heat Generation device (13).
6. the using method of the device of circulation fluidized bed coal gasifying ash discharge recycling according to claim 3, it is characterized in that, described converter (11) is in tilted layout, and constantly revolution, moves the solid materials in converter (11) continuously to cement exit (1102) direction of converter (11).
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