CN104073311A - Purification system for biogas - Google Patents
Purification system for biogas Download PDFInfo
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- CN104073311A CN104073311A CN201410350212.2A CN201410350212A CN104073311A CN 104073311 A CN104073311 A CN 104073311A CN 201410350212 A CN201410350212 A CN 201410350212A CN 104073311 A CN104073311 A CN 104073311A
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- water
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- wash column
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Abstract
The invention discloses a purification system for biogas, which comprises a biogas pressurizing device, an accumulator tank, a water scrubber, a drier, a resolving tower, an air blower and a water storage tank, wherein the biogas enters the water scrubber after being pressurized, water is sprayed downwards from the upper part of the water scrubber body in at least two grades to remove carbon dioxide and hydrogen sulfide in the biogas; purified biogas is discharged from the top of the water scrubber, and dried by the drier for standby use; the water which is rich in carbon dioxide and hydrogen sulfide flows through the resolving tower, blown by gas in the resolving tower, and used in the water scrubber again to remove carbon dioxide and hydrogen sulfide after carbon dioxide and hydrogen sulfide in the water are removed. The purification system is formed according to the scheme that the solvabilities of carbon dioxide, hydrogen sulfide and methane are different in water, and the water scrubber is built according to a physical adsorption process; no filler nor chemosorbent is needed; the purpose of biogas purification is realized; the structure is simple; the energy consumption as well as the cost is low; the environment is protected; the produced biogas is qualified; water resource is saved; emission of three wastes is avoided.
Description
Technical field
The present invention relates to a kind of pressure WATER-WASHING METHOD of utilizing, 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 still be take low-grade thermal utilization as main, but along with centralized biogas engineering development, single methane engineering methane output constantly increases, the middle and high end of biogas utilizes approach constantly to expand, wherein marsh gas purifying purify after for vehicle fuel, to be incorporated to gas distributing system etc. be the important development direction of biogas utilization from now on.Marsh gas purifying need meet compressed natural gas used as vehicle fuel standard (GB 18047-200), namely for methane content>=95%, carbonic acid gas≤3%, hydrogen sulfide≤15mg/m for vehicle fuel after purifying
3.
Yet marsh gas purifying is purified has but increased production cost, has had at present the methane purification technology such as pressure-variable adsorption, chemical absorption, no matter be pressure-variable adsorption or chemical absorption, all the use of sorbent material or absorption agent, troublesome poeration will be related to, system complex, and cost is high, not environmental protection.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, the simple marsh gas purifying purification system of system architecture 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 a kind of simple in structure, do 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 pneumatic outlet of described 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, in described liquid storage section, be also provided with two level window one on the other, the level window that is 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, on every layer of tower body, be also provided with visor body,
Described water discharge valve is communicated with the fluid inlet that is 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 is received 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, on water distributor and the tank connected pipeline of water storage, is provided with pump.
Adopt technique scheme.Purification system of the present invention, by physical absorption process, is realized CO
2and H
2s is separated with methane.Pressure has a significant impact refining effect, and Henry rule: Pi=HCmax is followed in its impact on solubleness.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
Main compound dissolving situation in water in table 1 biogas
When pressure increases, three kinds of gas solubleness in water increases, due to CH
4henry coefficient maximum, its solubleness in water is just minimum, regulates the just good gas such as separation of methane and carbonic acid gas of suitable pressure parameter.
Utilize this point, biogas enters water wash column by the inlet mouth from water wash column after surge tank after by be pressurized to >=2MPa of supercharging device.
Open pump to water-filling in water distributor, water sprays in tower body from waterworks, until water level, during to liquid storage Duan Shangyi level window, opens the water discharge valve of liquid storage section bottom and the vent valve on 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 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.The two counter current contact of water and gas, 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 GB 18047-200 requirement, namely for methane content>=95%, carbonic acid gas≤3%, hydrogen sulfide≤15mg/m
3.The setting of visor body is convenient to observe the distribution situation of aqueous vapor in tower body, adjusts flooding velocity and charge flow rate in good time.Carbonic acid gas water wash column of the present invention does not need sorbent material, does not need filler, Pall ring just can meet GB requirement by purifying biogas, and simple in structure, cost is low.
Secondly, we pass through Analytic Tower by the water that is rich in carbonic acid gas and hydrogen sulfide at the bottom of by water wash column tower, water stays from the top of Analytic Tower, gas blower air blast enters from the bottom of Analytic Tower, and by the carbonic acid gas in water and hydrogen sulfide removal, then water enters in water tank the wash-out for carbonic acid gas and hydrogen sulfide 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, with respect to two waterworkss, are unlikely to again to increase more cost.
In technique scheme for the ease of controlling the flow of aqueous vapor and pressure in tower body: on the pipeline that described water jet standpipe is connected with water distributor, be respectively equipped with under meter and flow control valve.On water distributor and the tank connected pipeline of water storage, be also provided with flow control valve, under meter and tensimeter.On the pipeline between surge tank and the inlet mouth of water wash column, be 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, on visor body body, be provided with axial center hole, the aperture of described axial center hole is identical with the internal diameter of tower body, on this visor body body, be also provided with radial direction through hole, on the aperture at the two ends of described radial direction through hole, be separately installed with visible mirror, the position correspondence that visor body is installed on described tower body is provided with radial hole, described visor body inserts in this radial hole, and the medullary ray of the axial center hole of described visor body and the axis of tower body are on same straight 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, according to physical adsorption process, build water wash column, thereby form the purification system of biogas, allow biogas after water wash column, remove carbonic acid gas and hydrogen sulfide wherein, do not need filler, do not need the chemosorbents such as alkali lye, reach the object of purifying biogas, simple in structure, energy consumption is low, cost is low, environmental protection, and gas product meets GB 18047-200 requirement.In addition, the water that is rich in carbonic acid gas and hydrogen sulfide that the present invention discharges water wash column lower end is 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 in water tank again for purifying biogas, and 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 comprised 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, at this, its structure is not repeated.
The pneumatic outlet of biogas supercharging device 1 is communicated with the gas feed of surge tank 2 by pipeline, surge tank 2 comprises tank body, is provided with inlet mouth and pneumatic outlet on tank body, and the top of surge tank is provided with safety valve, its lower end is provided with wash water valve, is also provided with and detects mouth and tensimeter on tank body.
Water wash column comprises that at least two-layer tower body 3-1 is positioned at the demist section 3-6 of top layer tower body 3-1 top and the liquid storage section 3-2 that is positioned at orlop tower body 3-1 lower end, be preferably three layers of tower body 3-1 herein, between every layer of tower body 3-1, by ring flange, connect, between top layer tower body 3-1 and demist section 3-6, by ring flange, connect.
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 that is positioned at Analytic Tower 5 tops by pipeline, and the bottom of Analytic Tower 5 is provided with gas feed, its structure is prior art, at this, does not repeat.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 is received 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.On the pipeline between surge tank 2 and the inlet mouth of water wash column, be provided with gas regulating valve 16, under meter 13 and gas-pressure meter 17.
On liquid storage section 3-2, be also provided with two level window 3-5 one on the other, the level window 3-5 that is 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, 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 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, on the pipeline being connected, is provided with pump 12 at water distributor 11 with water tank 7.On the pipeline that water jet standpipe 8 is connected with water distributor 11, be respectively equipped with under meter 13 and flow control valve 14.On the pipeline being connected with water tank 7 at water distributor 11, be also provided with flow control valve 14, under meter 13 and tensimeter 15.
The top of the tower body 3-1 of the superiors is provided with demist section 3-6, in demist section 2-6, is provided with demist net 18.
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, on 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, on visor body body 10-1, be 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, on this visor body body 10-1, be also provided with radial direction through hole, on the aperture at the two ends of radial direction through hole, be separately installed with visible mirror 10-3, the upper position that visor body 10 is installed of tower body 3-1 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 is on same straight line.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just can design according to the present invention make many modifications and variations without creative work.Therefore, all technician in the art, all should be in the determined protection domain by 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), in described liquid storage section (3-2), be also provided with two level window (3-5) one on the other, the level window (3-5) that is 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 outside tower body (3-1), the top of the superiors' tower body (3-1) is provided with demist section (3-6), the top of described carbonic acid gas water wash column is provided with vent valve (3-7), described vent valve (3-7) is communicated with moisture eliminator (4) by pipeline, on every layer of tower body (3-1), be also provided with visor body (10),
Described water discharge valve (3-3) is communicated with the fluid inlet that is 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) is received 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, on the pipeline being connected, is provided with pump (12) at water distributor (11) with water tank (7).
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: on the pipeline that described water jet standpipe (8) is connected with water distributor (11), be 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 being connected with water tank (7) at water distributor (11), 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: on the pipeline between surge tank (2) and the inlet mouth of water wash column, be 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), on visor body body (10-1), be 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), on this visor body body (10-1), be also provided with radial direction through hole, on the aperture at the two ends of described radial direction through hole, be separately installed with visible mirror (10-3), the upper position that visor body (10) is installed of described tower body (3-1) is provided with radial hole, described visor body (10) inserts in this radial hole, and the axis of the medullary ray of the axial center hole of described visor body (10) and tower body (3-1) is on same straight line.
7. methane purification purification system according to claim 1, is characterized in that: in described demist section (2-6), be provided with demist net (18).
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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| 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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| CN104073311A true CN104073311A (en) | 2014-10-01 |
| CN104073311B CN104073311B (en) | 2016-01-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731494A (en) * | 2016-12-02 | 2017-05-31 | 山东省科学院能源研究所 | The process of desorption 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2014
- 2014-07-23 CN CN201410350212.2A patent/CN104073311B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731494A (en) * | 2016-12-02 | 2017-05-31 | 山东省科学院能源研究所 | The process of desorption air lift coupled and pressurizing absorption purification biogas |
| 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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| Publication number | Publication date |
|---|---|
| CN104073311B (en) | 2016-01-20 |
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