CN106744956A - A kind of high-pressure washing methane purification carbon dioxide in process recovery process - Google Patents
A kind of high-pressure washing methane purification carbon dioxide in process recovery process Download PDFInfo
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- CN106744956A CN106744956A CN201611194951.2A CN201611194951A CN106744956A CN 106744956 A CN106744956 A CN 106744956A CN 201611194951 A CN201611194951 A CN 201611194951A CN 106744956 A CN106744956 A CN 106744956A
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- gas
- carbon dioxide
- flash tank
- absorption tower
- rectifying column
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/104—Carbon dioxide
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- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to methane purification apparatus field, a kind of high-pressure washing methane purification carbon dioxide in process recovery process is particularly disclosed.It includes absorption tower, primary flash tank, two-stage flash tank, desorber, carbon-dioxide gas compressor, carbon dioxide molecule sieve dehydration device, rectifying column, reboiler, condenser and gas-liquid separator, the recovery repeatedly that the present invention passes through on-condensible gas, the rate of recovery of final methane can reach 99.5%, it is much higher than the 98.5% of conventional recycling processes, while also causing that the cost recovery of carbon dioxide is greatly reduced.
Description
（One）Technical field
The present invention relates to methane purification apparatus field, more particularly to a kind of high-pressure washing methane purification carbon dioxide in process is reclaimed
Technique.
（Two）Background technology
The main component of biogas is methane and CO2, by removing the CO in biogas2The calorific value of biogas can be effectively improved so as to open up
Open up the range of application of biogas.CH4Greenhouse effects be CO221 times, therefore improve CH4The rate of recovery for reduce greenhouse gases
Discharge it is most important.For large-sized biogas engineering, CO in biogas is reclaimed2As product, whole item can be effectively improved
Purpose profitability.
Conventional high-pressure washing Methane decarbonization method is due to CH4And CO2The difference of solubility in water, with conventional natural pond
Gas physical absorption process is similar to, and simply operating parameter is slightly different, as illustrated, biogas after desulfurization and the recirculated water after supercharging
The counter-current absorption in absorption tower, harvests bio-natural gas at the top of absorption tower（Containing the saturation water under operating condition, it is necessary to by
Follow-up dehydration link meets the indices of natural gas）, CO is absorbed under pressure2Recirculated water from the bottom on absorption tower out,
Step-down flash distillation is carried out into flash tank by pressure difference in absorption tower and flash tank, due to CO2And CH4The difference of dissolution law, leads to
Step-down flash distillation is crossed, the most of CH in water can be dissolved in4Preferentially flash off, CO in flash gas2Amount it is relatively fewer, will
The gas for flashing off is back in the biogas before pressure washing, further decarburization, so as to realize CH during Methane decarbonization4Return
The raising of yield, in general, by pressure method for washing, CH4The rate of recovery 98.5% or so, in order to realize following for process water
Ring is used, and the process water after flash distillation enters desorber, the CO for being eliminated as much as being dissolved in water by air stripping2, due to
CO in the technique2Do not consider to reclaim, by the CO after air stripping2Content is 15%（v/v）Left and right, content is relatively low, cost recovery
It is higher.
（Three）The content of the invention
A kind of defect in order to make up prior art of the invention, there is provided the high pressure that recovery rate of CO 2 is high, cost recovery is low
Washing methane purification carbon dioxide in process recovery process.
The present invention is achieved through the following technical solutions：
A kind of high-pressure washing methane purification carbon dioxide in process recovery system, it is characterized in that, including absorption tower, primary flash
Tank, two-stage flash tank, desorber, carbon-dioxide gas compressor, carbon dioxide molecule sieve dehydration device, rectifying column, reboiler, condensation
The upper end of device and gas-liquid separator, wherein absorption tower sets bio-natural gas outlet, and the bottom connection desulfurizer on absorption tower is inhaled
The lower end for receiving tower connects the top of primary flash tank by pipeline, and the upper end of primary flash tank is connected to biogas entrance by pipeline
Place, the circulating water outlet of primary flash tank lower end connects the water inlet on two-stage flash tank top by pipeline, two-stage flash tank
Lower end connects the top of desorber, and the bottom of desorber connects air inlet pipe, and the lower end of desorber is connected to absorption by circulating pump
The top of tower, the upper end of desorber sets blow-down pipe, and the gas vent of the upper end of the two-stage flash tank is connected to carbon dioxide
Suction port of compressor, carbon-dioxide gas compressor outlet is connected to carbon dioxide molecule sieve dehydration device entrance, carbon dioxide molecule sieve
The outlet of dehydration device is connected to the gas phase entrance of rectifying column, the top connection gas-liquid separator of rectifying column, rectifying column and gas-liquid
Condenser is connected between separator, the gas vent on gas-liquid separator top is connected to biogas porch, gas-liquid point by pipeline
Condensation-water drain from device lower end is connected on rectifying column, the bottom connection liquid carbon dioxide outlet of rectifying column, liquid dioxy
It is connected on rectifying column by reboiler again on the pipeline for changing carbon outlet.
The two-stage flash tank is vacuum flasher or atmospheric flashing tank.
Its recovery process is：Biogas after desulfurization and the recirculated water after the supercharging counter-current absorption in absorption tower, on absorption tower
Top harvests bio-natural gas, under pressure the recirculated water of absorbing carbon dioxide from the bottom on absorption tower out, by absorption tower with
The interior pressure difference of primary flash tank carries out step-down flash distillation into primary flash tank, the gas after flash distillation again return to absorption tower continue into
Row counter-current absorption process, the recirculated water after flash distillation is entered from the circulating water outlet of primary flash tank by the water inlet of two-stage flash tank
Entering two-stage flash tank carries out atmospheric flashing or vacuum flashing, and the gas after the recirculated water after flash distillation is distilled into desorber is passed through
Blow-down pipe is discharged, and liquid returns to absorption tower interior circulation and uses, and the gas that two-stage flash tank is flashed off is from two-stage flash tank
The outlet at end enters by rectifying column after sequentially entering carbon-dioxide gas compressor and carbon dioxide molecule sieve dehydration device dehydration, again boils
The carbon dioxide rectifying tower of device, condenser and gas-liquid separator composition carries out gas-liquid separation, the liquid carbon dioxide separated
Exported from liquid carbon dioxide and discharged, gas is returned carries out secondary recovery in absorption tower.
The pressure is 0.6-1.6Mpa.
The beneficial effects of the invention are as follows：
The recovery repeatedly that the present invention passes through on-condensible gas, the rate of recovery of final methane can reach 99.5%, be much higher than conventional returning
The 98.5% of skill of knocking off, while also causing that the cost recovery of carbon dioxide is greatly reduced.
（Four）Brief description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings：
Fig. 1 is attachment structure schematic diagram of the invention.
In figure, 1 desulfurizer, 2 biogas entrances, 3 absorption towers, the outlet of 4 bio-natural gas, 5 primary flash tanks, 6 two grades of sudden strains of a muscle
Steaming pot, 7 carbon-dioxide gas compressors, 8 carbon dioxide molecules sieve dehydration device, 9 rectifying columns, 10 reboilers, 11 condensers, 12 gas-liquids
Separator, 13 air inlet pipe, the outlet of 14 liquid carbon dioxides, 15 desorbers, 16 blow-down pipes, 17 circulating pumps.
（Five）Specific embodiment
Accompanying drawing is specific embodiment of the invention.As shown in figure 1, this kind of high-pressure washing methane purification carbon dioxide in process is reclaimed
Technique, including absorption tower 3, primary flash tank 5, two-stage flash tank 6, desorber 15, carbon-dioxide gas compressor 7, carbon dioxide point
Son sieve dehydration device 8, rectifying column 9, reboiler 10, condenser 11 and gas-liquid separator 12, the wherein upper end on absorption tower 3 sets life
Thing gas outlet 4, the bottom on absorption tower 3 connects desulfurizer 1 by biogas entrance 2, and the lower end on absorption tower 3 is connected by pipeline
The top of primary flash tank 5 is connect, the upper end of primary flash tank 5 is connected at biogas entrance 2 by pipeline, under primary flash tank 5
The circulating water outlet at end connects the water inlet on the top of two-stage flash tank 6, the lower end connection desorber of two-stage flash tank 6 by pipeline
15 top, the bottom connection air inlet pipe 13 of desorber 15, the lower end of desorber 15 is connected to absorption tower 3 by circulating pump 17
Top, the upper end of desorber 15 sets blow-down pipe 16, and the gas vent of the upper end of two-stage flash tank 6 is connected to carbon dioxide compression
The entrance of machine 7, the outlet of carbon-dioxide gas compressor 7 is connected to the carbon dioxide molecule sieve entrance of dehydration device 8, and carbon dioxide molecule sieve is de-
The outlet of water installations 8 is connected to the gas phase entrance of rectifying column 9, the top connection gas-liquid separator 12 of rectifying column 9, the He of rectifying column 9
Condenser 11 is connected between gas-liquid separator 12, the gas vent on the top of gas-liquid separator 12 is connected to biogas entrance by pipeline
At 2, the condensation-water drain of gas-liquid separator lower end is connected on rectifying column 9, and the bottom connection liquid carbon dioxide of rectifying column 9 goes out
Mouth 14, is connected on rectifying column 9 by reboiler 10 again on the pipeline of liquid carbon dioxide outlet 14；Wherein, two-stage flash tank 6
It is vacuum flasher or atmospheric flashing tank, it is also possible to which the two is used in combination, if only setting atmospheric flashing tank, typically can be by biogas
In about 65% or so CO2Liquefaction is reclaimed, if increasing vacuum desorption, about 80% or so CO in biogas2Liquefaction is reclaimed, often
Pressure flash tank and Vacuum solutions cucurbitula can be separately provided, and can also merge into a device, disclosure satisfy that technological requirement.
Its recovery process is：Biogas after desulfurization and the recirculated water after the supercharging counter-current absorption in absorption tower 3, on absorption tower
3 top harvesting bio-natural gas, the recirculated water of absorbing carbon dioxide goes out from the bottom on absorption tower 3 under the pressure of 0.6-1.6Mpa
Come, step-down flash distillation is carried out into primary flash tank 5 by the interior pressure difference of absorption tower 3 and primary flash tank 5, the gas after flash distillation is again
Return to absorption tower 3 and proceed counter-current absorption process, the recirculated water after flash distillation passes through from the circulating water outlet of primary flash tank 5
The water inlet of two-stage flash tank 6 carries out atmospheric flashing or vacuum flashing into two-stage flash tank 6, and the recirculated water after flash distillation enters solution
Inhale the gas after tower 15 is distilled to be discharged through blow-down pipe 16, liquid returns to the interior circulation of absorption tower 3 and uses, and secondary flash tank dodges
98% or so, remaining impurity is mainly methane to carbon dioxide in gas content after steaming, and micro hydrogen sulfide, oxygen etc.,
The outlet of these gases from two-stage flash tank 6 sequentially enters carbon-dioxide gas compressor 7 and carbon dioxide molecule sieve dehydration device 8 takes off
Enter the carbon dioxide rectifying tower 9 being made up of rectifying column 9, reboiler 10, condenser 11 and gas-liquid separator 12 after water and enter promoting the circulation of qi
Liquid is separated, and the liquid carbon dioxide separated is discharged from liquid carbon dioxide outlet 14, can be used as the liquid dioxy of technical grade
Change carbon products, in the on-condensible gas separated, in 15%-50% or so, remaining main component is carbon dioxide to methane content, no
Solidifying gas returns to absorption tower 3, further reclaims methane, and after reclaiming repeatedly, the rate of recovery of methane can further improve
More than 99.5%.
In addition to technical characteristic described in specification, remaining technical characteristic is technology known to those skilled in the art.
Claims (4)
1. a kind of high-pressure washing methane purification carbon dioxide in process recovery system, it is characterized in that, including absorption tower（3）, one-level
Flash tank（4）, two-stage flash tank（6）, desorber（15）, carbon-dioxide gas compressor（7）, carbon dioxide molecule sieve dehydration device
（8）, rectifying column（9）, reboiler（10）, condenser（11）And gas-liquid separator（12）, wherein absorption tower（3）Upper end set life
Thing gas outlet（4）, absorption tower（3）Bottom connection desulfurizer（1）, absorption tower（3）Lower end by pipeline connect one
Level flash tank（5）Top, primary flash tank（5）Upper end biogas entrance is connected to by pipeline（2）Place, primary flash tank
（5）The circulating water outlet of lower end connects two-stage flash tank by pipeline（6）The water inlet on top, two-stage flash tank（6）Lower end
Connection desorber（15）Top, desorber（15）Bottom connection air inlet pipe（13）, desorber（15）Lower end by circulation
Pump（17）It is connected to absorption tower（1）Top, desorber（15）Upper end set blow-down pipe（16）, the two-stage flash tank（6）
The gas vent of upper end be connected to carbon-dioxide gas compressor（7）Entrance, carbon-dioxide gas compressor（7）Outlet is connected to titanium dioxide
Carbon molecular sieve dehydration device（8）Entrance, carbon dioxide molecule sieve dehydration device（8）Outlet be connected to rectifying column（9）Gas phase
Entrance, rectifying column（9）Top connection gas-liquid separator（12）, rectifying column（9）And gas-liquid separator（12）Between connect condensation
Device（11）, gas-liquid separator（11）The gas vent on top is connected to biogas entrance by pipeline（2）Place, gas-liquid separator（11）
The condensation-water drain of lower end is connected to rectifying column（9）On, rectifying column（9）Bottom connection liquid carbon dioxide outlet（14）, liquid
State carbon dioxide outlet（14）Pipeline on again pass through reboiler（10）It is connected to rectifying column（9）On.
2. high-pressure washing methane purification carbon dioxide in process recovery system according to claim 1, it is characterized in that, it is described
Two-stage flash tank（6）It is vacuum flasher or atmospheric flashing tank.
3. the technique that carbon dioxide recovery is carried out using the recovery system described in claim 1 or 2, it is characterized in that, after desulfurization
Biogas and supercharging after recirculated water in absorption tower counter-current absorption, bio-natural gas are harvested at the top of absorption tower, under pressure absorb
From the bottom on absorption tower out, the interior pressure difference by absorption tower and primary flash tank enters primary flash to the recirculated water of carbon dioxide
Tank carries out step-down flash distillation, and the gas after flash distillation again returns to absorption tower and proceeds counter-current absorption process, the recirculated water after flash distillation
Atmospheric flashing or true is carried out into two-stage flash tank by the water inlet of two-stage flash tank from the circulating water outlet of primary flash tank
Sky flash distillation, the gas after the recirculated water after flash distillation is distilled into desorber is discharged through blow-down pipe, and liquid returns to absorption tower
Interior circulation is used, and the outlet of the gas that two-stage flash tank is flashed off from two-stage flash tank upper end sequentially enters carbon dioxide compression
Enter what is be made up of rectifying column, reboiler, condenser and gas-liquid separator after machine and carbon dioxide molecule sieve dehydration device dehydration
Carbon dioxide rectifying tower carries out gas-liquid separation, and the liquid carbon dioxide separated is exported from liquid carbon dioxide and discharged, gas
Returning carries out secondary recovery in absorption tower.
4. the technique of carbon dioxide recovery according to claim 3, it is characterized in that, the pressure is 0.6-1.6Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611194951.2A CN106744956A (en) | 2016-12-22 | 2016-12-22 | A kind of high-pressure washing methane purification carbon dioxide in process recovery process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611194951.2A CN106744956A (en) | 2016-12-22 | 2016-12-22 | A kind of high-pressure washing methane purification carbon dioxide in process recovery process |
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| CN110094634A (en) * | 2019-04-09 | 2019-08-06 | 同济大学 | A kind of negative carbon emission biomass produces the system and method for biogas |
| CN114231328A (en) * | 2021-12-23 | 2022-03-25 | 江苏泓润生物质能科技有限公司 | Biogas purification method |
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Application publication date: 20170531 |