CN104073311B - Methane purification purification system - Google Patents
Methane purification purification system Download PDFInfo
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- CN104073311B CN104073311B CN201410350212.2A CN201410350212A CN104073311B CN 104073311 B CN104073311 B CN 104073311B CN 201410350212 A CN201410350212 A CN 201410350212A CN 104073311 B CN104073311 B CN 104073311B
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Abstract
The invention discloses a kind of methane purification purification system, comprise biogas supercharging device, surge tank, water wash column, moisture eliminator, Analytic Tower, gas blower and water tank, biogas enters water wash column after supercharging, moisture be at least two-stage from tower body top Jet with downward flow direction by carbon dioxide in gas and hydrogen sulfide removal, biogas after purification is got rid of from the top of water wash column, for subsequent use after moisture eliminator drying, be rich in the water of carbonic acid gas and hydrogen sulfide through Analytic Tower, blow with gas in Analytic Tower, water after carbonic acid gas wherein and hydrogen sulfide removal is used for removing carbonic acid gas and hydrogen sulfide in water wash column again.The present invention utilizes carbonic acid gas, hydrogen sulfide and the methane different solubility in water, build water wash column according to physical adsorption process, thus form the purification system of biogas, do not need filler, do not need the chemosorbents such as alkali lye, reach the object of purifying biogas, structure is simple, and energy consumption is low, cost is low, environmental protection, gas product is qualified, saving water resource, without the discharge of the three wastes.
Description
Technical field
The present invention relates to one and utilize pressure WATER-WASHING METHOD, according to the difference of carbonic acid gas and hydrogen sulfide and the solubleness of methane in water, by the methane purification purification system of carbon dioxide in methane and hydrogen sulfide removal.
Background technology
Biogas is a kind of inflammable gas with higher thermal value, and main component is methane (CH
4) and carbonic acid gas (CO
2) and a small amount of nitrogen (N
2), hydrogen (H
2), oxygen (O
2), hydrogen sulfide (H
2the gas such as S).At present, a large amount of biogas utilizations is still based on low-grade thermal utilization, but along with centralized biogas engineering development, single methane engineering methane output constantly increases, the middle and high end utilization ways of biogas is constantly expanded, wherein marsh gas purifying purify after for vehicle fuel, be incorporated to the important development direction that gas distributing system etc. is biogas utilization from now on.Marsh gas purifying need meet compressed natural gas used as vehicle fuel standard (GB18047-200) for vehicle fuel, namely for methane content>=95%, carbonic acid gas≤3%, hydrogen sulfide≤15mg/m after purifying
3.
But marsh gas purifying is purified and is but added production cost, there is the methane purification such as pressure-variable adsorption, chemical absorption technology at present, no matter be pressure-variable adsorption or chemical absorption, all will the use of sorbent material or absorption agent be related to, troublesome poeration, system complex, and cost is high, not environmentally.Therefore purification process energy consumption is low, efficiency is high to find one, and high, the environmental protection of methane content in gas, cost are low, system architecture simple marsh gas purifying purification system becomes current people's problem in urgent need to solve.
In addition, existing chemiadsorption, will cause the waste of a large amount of water resourcess.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides that a kind of structure simply, does not need that filler, Pall ring and sorbent material, cost are low, environmental protection, methane purification purification system that energy consumption is low.
To achieve these goals, technical scheme of the present invention is as follows: a kind of methane purification purification system, comprise biogas supercharging device, surge tank, water wash column, moisture eliminator, Analytic Tower, gas blower and water tank, it is characterized in that: the described pneumatic outlet of biogas supercharging device is communicated with the inlet mouth of surge tank, the pneumatic outlet of surge tank is communicated with the inlet mouth of water wash column, described water wash column comprises at least two-layer tower body, the lower end of orlop tower body is provided with liquid storage section, the bottom of described liquid storage section is provided with water discharge valve, the inlet mouth of described water wash column is arranged on the top of liquid storage section, described liquid storage section is also provided with two level window one on the other, the level window being wherein positioned at top is positioned at the below of the inlet mouth of water wash column, top in every layer of tower body is provided with waterworks, described waterworks comprises water jet standpipe and is arranged on the nozzle on water jet standpipe, the water-in of all water jet standpipes stretches out outside tower body, the top of the superiors' tower body is provided with demist section, the top of described carbonic acid gas water wash column is provided with vent valve, described vent valve is communicated with moisture eliminator by pipeline, every layer of tower body has also been provided with visor body,
Described water discharge valve is communicated with the fluid inlet being positioned at Analytic Tower top by pipeline, and the bottom of described Analytic Tower is provided with gas feed, and the air outlet of described gas blower is connected with the gas feed of Analytic Tower by pipeline; The lower end of described Analytic Tower is provided with water outlet, and upper end is provided with venting port, and the water outlet of described Analytic Tower receives water tank by pipeline;
The water-in of described water jet standpipe is connected with water distributor respectively by pipeline, and the water-in of described water distributor is connected to water tank by pipeline, and water distributor and the tank connected pipeline of water storage are provided with pump.
Adopt technique scheme.Purification system of the present invention, by physical absorption process, realizes CO
2and H
2s is separated with methane.Pressure has a significant impact refining effect, and it follows Henry rule to the impact of solubleness: Pi=HCmax.Wherein: Pi is pressure [Pa], H is Henry coefficient [Pam
3/ mol], Cmax is saturation concentration [mol/m
3].
Carbonic acid gas, hydrogen sulfide and the methane solubleness situation in water is in table 1
In table 1 biogas, main compound dissolves situation in water
When the pressure was increased, the solubleness of three kinds of gases in water increases, due to CH
4henry coefficient maximum, its solubleness in water is just minimum, regulates suitable pressure parameter just can the good gas such as separation of methane and carbonic acid gas.
Utilize this point, biogas by supercharging device be pressurized to >=2MPa after enter water wash column by the inlet mouth from water wash column after surge tank.
Open pump to water-filling in water distributor, water sprays in tower body from waterworks, when water level is to liquid storage Duan Shangyi level window, opens the vent valve on water discharge valve bottom liquid storage section and tower body top, carrys out adjusting tower internal pressure.
Then in surge tank, biogas (now biogas pressure>=2MPa) enters in tower body from gas feed, and biogas charge flow rate is 4-6m
3/ h, moisture is that at least two-stage is from tower body top Jet with downward flow direction, and tower internal pressure is 1.0-1.2Mpa, and the flow of water is 0.6-0.72m
3/ h.Both water and gas counter current contact, purifying biogas is collected after drying from tower top, and equipment operation, after at least 3 minutes, utilizes biogas analysis-e/or determining gas product composition at product gas outlet place.Gas product meets GB18047-200 requirement, namely for methane content>=95%, carbonic acid gas≤3%, hydrogen sulfide≤15mg/m
3.The distribution situation of observing aqueous vapor in tower body is convenient in the setting of visor body, in good time adjustment flooding velocity and charge flow rate.Carbonic acid gas water wash column of the present invention does not need sorbent material, does not need filler, Pall ring just can meet Standard by purifying biogas, and structure is simple, and cost is low.
Secondly, the water being rich in carbonic acid gas and hydrogen sulfide at the bottom of water wash column tower is passed through Analytic Tower by us, the top of water analytically tower stays, the bottom of gas blower air blast analytically tower enters, and by the carbonic acid gas in water and hydrogen sulfide removal, then water enters the wash-out for carbonic acid gas and hydrogen sulfide in water tank again, water saving, cost is low, environmental protection, three-waste free discharge.
In technique scheme: in described tower body, described water wash column comprises three layers of tower body.Three layers of tower body, three waterworkss, make the refining effect of gas product better, are unlikely to again to increase more cost relative to two waterworkss.
For the ease of controlling the flow of aqueous vapor and the pressure in tower body in technique scheme: the pipeline that described water jet standpipe is connected with water distributor is respectively equipped with under meter and flow control valve.Water distributor and the tank connected pipeline of water storage are also provided with flow control valve, under meter and tensimeter.Pipeline between surge tank and the inlet mouth of water wash column is provided with gas regulating valve, under meter and gas-pressure meter.
In technique scheme: described visor body is two-sided visor body, comprise tubular visor body body, visor body body is provided with axial center hole, the aperture of described axial center hole is identical with the internal diameter of tower body, this visor body body is also provided with radial direction through hole, the aperture at the two ends of described radial direction through hole is separately installed with visible mirror, the position correspondence of described tower body being installed visor body is provided with radial hole, described visor body inserts in this radial hole, and the axis of the medullary ray of the axial center hole of described visor body and tower body on the same line.Adopt two-sided visor body, be more convenient for observing.
In technique scheme, for the ease of removing the water smoke in purified gases, in described demist section, be provided with demist net.
Beneficial effect: the present invention utilizes carbonic acid gas, hydrogen sulfide and the methane different solubility in water, build water wash column according to physical adsorption process, thus form the purification system of biogas, allow biogas after water wash column, remove carbonic acid gas wherein and hydrogen sulfide, do not need filler, do not need the chemosorbents such as alkali lye, reach the object of purifying biogas, structure is simple, energy consumption is low, cost is low, environmental protection, and gas product meets GB18047-200 requirement.In addition, the water being rich in carbonic acid gas and hydrogen sulfide that water wash column lower end is discharged by the present invention by Analytic Tower, under the effect of gas blower, carbonic acid gas in water and hydrogen sulfide are taken out of, water is got back to again for purifying biogas in water tank, saving water resource, without the discharge of the three wastes.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the enlarged view of water wash column in Fig. 1
Fig. 3 is the structural representation of visor body of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment 1, as Figure 1-3, methane purification purification system of the present invention is made up of parts such as supercharging device 1, surge tank 2, water wash column, moisture eliminator 4, Analytic Tower 5, gas blower 6, water tank 7, water jet standpipe 8, nozzle 9, visor body 10, water distributor 11, pump 12, under meter 13, flow control valve 14, tensimeter 15, gas regulating valve 16, gas-pressure meter 17, demist nets 18.
Biogas supercharging device 1 is prior art, does not repeat at this to its structure.
The pneumatic outlet of biogas supercharging device 1 is communicated with by the gas feed of pipeline with surge tank 2, surge tank 2 comprises tank body, and tank body is provided with inlet mouth and pneumatic outlet, and the top of surge tank is provided with safety valve, its lower end is provided with wash water valve, tank body is also provided with and detects mouth and tensimeter.
Water wash column comprises at least two-layer tower body 3-1 and is positioned at the demist section 3-6 above most top layer tower body 3-1 and is positioned at the liquid storage section 3-2 of orlop tower body 3-1 lower end, be preferably three layers of tower body 3-1 herein, connected by ring flange between every layer of tower body 3-1, most connected by ring flange between top layer tower body 3-1 and demist section 3-6.
The lower end of orlop tower body 3-1 is provided with liquid storage section 3-2, the bottom of liquid storage section 3-2 is provided with water discharge valve 3-3, and water discharge valve 3-3 is communicated with the fluid inlet being positioned at Analytic Tower 5 top by pipeline, and the bottom of Analytic Tower 5 is provided with gas feed, its structure is prior art, does not repeat at this.The air outlet of gas blower 6 is connected with the gas feed of Analytic Tower by pipeline; The lower end of Analytic Tower 5 is provided with water outlet, and upper end is provided with venting port, and the water outlet of Analytic Tower 5 receives water tank 7 by pipeline.
The inlet mouth 3-4 of water wash column is arranged on the top of liquid storage section 3-2, and the gas feed of surge tank 2 is communicated with the inlet mouth 3-4 on liquid storage section 3-2 by pipeline.Pipeline between surge tank 2 and the inlet mouth of water wash column is provided with gas regulating valve 16, under meter 13 and gas-pressure meter 17.
Liquid storage section 3-2 is also provided with two level window 3-5 one on the other, the level window 3-5 being wherein positioned at top is positioned at the below of the inlet mouth 3-4 of water wash column, top in every layer of tower body 3-1 is provided with waterworks, the nozzle 9 that waterworks comprises water jet standpipe 8 and is arranged on water jet standpipe 8, the water-in of all water jet standpipes 8 stretches out outside tower body 3-1, the water-in of water jet standpipe 8 is connected with water distributor 11 respectively by pipeline, the water-in of water distributor 11 is connected to water tank 7 by pipeline, and the pipeline that water distributor 11 is connected with water tank 7 is provided with pump 12.The pipeline that water jet standpipe 8 is connected with water distributor 11 is respectively equipped with under meter 13 and flow control valve 14.The pipeline that water distributor 11 is connected with water tank 7 is also provided with flow control valve 14, under meter 13 and tensimeter 15.
The top of the superiors tower body 3-1 is provided with demist section 3-6, is provided with demist net 18 in demist section 2-6.
The top of carbonic acid gas water wash column is provided with vent valve 3-7, and vent valve 3-7 is communicated with moisture eliminator 4 by pipeline, and every layer of tower body 3-1 has also been provided with visor body 10; Visor body 10 is two-sided visor body, comprise tubular visor body body 10-1, visor body body 10-1 is provided with axial center hole 10-2, the aperture of axial center hole 10-2 is identical with the internal diameter of tower body 3-1, this visor body body 10-1 is also provided with radial direction through hole, the aperture at the two ends of radial direction through hole is separately installed with visible mirror 10-3, the position of tower body 3-1 installing visor body 10 is provided with radial hole, visor body 10 inserts in this radial hole, and the axis of the medullary ray of the axial center hole of visor body 10 and tower body 3-1 on the same line.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (7)
1. a methane purification purification system, comprise biogas supercharging device (1), surge tank (2), water wash column, moisture eliminator (4), Analytic Tower (5), gas blower (6) and water tank (7), it is characterized in that: the pneumatic outlet of described biogas supercharging device (1) is communicated with the inlet mouth of surge tank (2), the pneumatic outlet of surge tank (2) is communicated with the inlet mouth of water wash column, described water wash column comprises at least two-layer tower body (3-1), the lower end of orlop tower body (3-1) is provided with liquid storage section (3-2), the bottom of described liquid storage section (3-2) is provided with water discharge valve (3-3), the inlet mouth of described water wash column is arranged on the top of liquid storage section (3-2), described liquid storage section (3-2) is also provided with two level window (3-5) one on the other, the level window (3-5) being wherein positioned at top is positioned at the below of the inlet mouth of water wash column, top in every layer of tower body (3-1) is provided with waterworks, described waterworks comprises water jet standpipe (8) and is arranged on the nozzle (9) on water jet standpipe (8), the water-in of all water jet standpipes (8) stretches out tower body (3-1) outward, the top of the superiors' tower body (3-1) is provided with demist section (3-6), the top of described water wash column is provided with vent valve (3-7), described vent valve (3-7) is communicated with moisture eliminator (4) by pipeline, every layer of tower body (3-1) has also been provided with visor body (10),
Described water discharge valve (3-3) is communicated with the fluid inlet being positioned at Analytic Tower (5) top by pipeline, the bottom of described Analytic Tower (5) is provided with gas feed, and the air outlet of described gas blower (6) is connected with the gas feed of Analytic Tower by pipeline; The lower end of described Analytic Tower (5) is provided with water outlet, and upper end is provided with venting port, and the water outlet of described Analytic Tower (5) receives water tank (7) by pipeline;
The water-in of described water jet standpipe (8) is connected with water distributor (11) respectively by pipeline, the water-in of described water distributor (11) is connected to water tank (7) by pipeline, and the pipeline that water distributor (11) is connected with water tank (7) is provided with pump (12).
2. methane purification purification system according to claim 1, is characterized in that: described water wash column comprises three layers of tower body (3-1).
3. methane purification purification system according to claim 2, is characterized in that: the pipeline that described water jet standpipe (8) is connected with water distributor (11) is respectively equipped with under meter (13) and flow control valve (14).
4. methane purification purification system according to claim 1, is characterized in that: on the pipeline that water distributor (11) is connected with water tank (7), be also provided with flow control valve (14), under meter (13) and tensimeter (15).
5. methane purification purification system according to claim 1, is characterized in that: the pipeline between surge tank (2) and the inlet mouth of water wash column is provided with gas regulating valve (16), under meter (13) and gas-pressure meter (17).
6. methane purification purification system according to claim 1, it is characterized in that: described visor body (10) is two-sided visor body, comprise tubular visor body body (10-1), visor body body (10-1) is provided with axial center hole (10-2), the aperture of described axial center hole (10-2) is identical with the internal diameter of tower body (3-1), this visor body body (10-1) is also provided with radial direction through hole, the aperture at the two ends of described radial direction through hole is separately installed with visible mirror (10-3), the upper position of installing visor body (10) of described tower body (3-1) is provided with radial hole, described visor body (10) is inserted in this radial hole, and the medullary ray of the axial center hole of described visor body (10) and the axis of tower body (3-1) are on the same line.
7. methane purification purification system according to claim 1, is characterized in that: be provided with demist net (18) in described demist section (2-6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410350212.2A CN104073311B (en) | 2014-07-23 | 2014-07-23 | Methane purification purification system |
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|---|---|---|---|
| CN201410350212.2A CN104073311B (en) | 2014-07-23 | 2014-07-23 | Methane purification purification system |
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| CN104073311A CN104073311A (en) | 2014-10-01 |
| CN104073311B true CN104073311B (en) | 2016-01-20 |
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| CN106731494B (en) * | 2016-12-02 | 2019-10-08 | 山东省科学院能源研究所 | Desorb the process of air lift coupled and pressurizing absorption purification biogas |
| CN110172368A (en) * | 2019-06-26 | 2019-08-27 | 毅康科技有限公司 | A kind of integrated apparatus purified and remove pernicious gas in biogas |
| CN111925850A (en) * | 2020-09-08 | 2020-11-13 | 重庆市环卫集团有限公司 | Marsh gas pressure washing purification clean system |
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| CN202558833U (en) * | 2012-05-16 | 2012-11-28 | 北京健坤伟华新能源科技有限公司 | Integrated methane purification system |
| CN203411519U (en) * | 2013-02-01 | 2014-01-29 | 王仕华 | Biogas purifying system |
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