CN100469888C - Process for purification, pressurized storage, and transportation of marsh gas - Google Patents
Process for purification, pressurized storage, and transportation of marsh gas Download PDFInfo
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- CN100469888C CN100469888C CNB2006100969985A CN200610096998A CN100469888C CN 100469888 C CN100469888 C CN 100469888C CN B2006100969985 A CNB2006100969985 A CN B2006100969985A CN 200610096998 A CN200610096998 A CN 200610096998A CN 100469888 C CN100469888 C CN 100469888C
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- biogas
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- pressurization
- marsh gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention relates to the technique and method of biogas purifying, pressure-storing and transportation. The invention comprises the steps as following: washing with water, washing with mixed liquor of calcined lime and water or sodium hydrate solution, dehydrating, pressure-storing, and transporting. The invention can increase the biogas purity, reduce impurities content such as hydrogen sulfide, carbon dioxide, and water vapor, increase methane concentration to over 70%, maximum to over 95%. As the concentration of hydrogen sulfide is low, it emits no abnormal flavor when the biogas is burnt. The invention can realized the target of stable, long range, and large scale biogas supply, thus it is fit for large-scaled, marketized, and commercialized operation.
Description
Technical field
The present invention relates to marsh gas purifying, pressurization storage and delivery technology method.
Background technology
All kinds of ecological energy pattern engineerings that with biogas are tie are main construction contents of ecology homestead rich people plan.Present biogas engineering mainly contains methane-generating pit for farm household, the large, medium and small biogas engineering of plant and town domestic sewage marsh gas purifying engineering.Whole nation methane-generating pit sum has reached more than 1,000 ten thousand, and wherein domestic methane tank accumulative total reaches more than 700 ten thousand, and the proportion maximum is formula distribution fragmentarily on the layout, concentrate in flakes relatively, and be utilized as purpose with single household, is difficult to form scale and benefit.The biogas of the livestock and poultry farm that scale is bigger slightly mainly is to satisfy self-supporting personally, and unnecessary gas is not because of there being other digestion approach, often have to cause wastes and pollution to airborne release for methane-generating pit and personnel safety.
The biogas that domestic methane tank, middle-size and small-size biogas engineering produced, generally pass through purifying treatment or carry out the just directly use of simple purifying treatment, because impurity (hydrogen sulfide, carbonic acid gas, steam etc.) content height in this biogas, make that combustion heat value is low, peculiar smell is arranged, the kitchen range life-span is short.Even through simple desulfurization, processed, this extensive purification style must cause impurity removal percentage low; While, it was difficult to make sweetening agent, dewatering agent regenerate owing to the maintenance technology level is generally not high, often after desulfurizer, dewatering unit use for some time, will scrap renewal, had increased and had utilized cost.Domestic knowledgeable people also once imagined the dispersive collecting methane, resembled central gas supply liquefied petroleum gas (LPG), the Sweet natural gas.But pressure is low because methane-generating pit is worked off one's feeling vent one's spleen on the one hand, causes and collects difficulty, big because of the low required gas storage holder volume of biogas pressure on the other hand, take up an area of extensively, high-load sour gas is to the gas storage equipment seriously corroded simultaneously, and therefore domestic large scale collection, storage biogas still do not put into practice.Present situation with regard to present China biogas utilization, if do not have breakthrough, innovate in the processing method aspect, obviously can well do not taken on a new look in a short time, this self-produced personal, if utilize the not high situation of small scale, utilization ratio to continue, it is universal greatly to limit wideling popularize of biogas engineering undoubtedly.
Summary of the invention
The objective of the invention is: provide that methane content reaches 70% or more in the biogas of a kind of purification back, the simple marsh gas purifying of technology, pressurization storage and delivery technology method.
Concrete processing method is as follows:
Marsh gas purifying, pressurization store and the delivery technology method, comprise the steps
A, washing
The inlet mouth of biogas to be clean by the water washing tank bottom fed in the jar, discharge by the air outlet of tank top; The water yield in the described water washing tank is 1/2～2/3 of a tank volume;
B, alkali cleaning
The inlet mouth of biogas to be clean by the caustic treater bottom fed in the jar, discharge by the air outlet of tank top; Alkaline solution amount in the described caustic treater is 1/2～2/3 of a tank volume;
C, dehydration
Biogas to be drained off is fed in the jar by the inlet mouth of water knockout bottom, is discharged by the air outlet of tank top; The multi-layer absorbent sieve plate is arranged in the described water knockout;
D, pressurization store
The compressed machine of dehydration back biogas is pressed into air container, and storage pressures range is 0.1～10MPa;
E, conveying
The biogas that is stored in the container uses to the user through decompression and by pipe-line transportation.
Washing is composed in series multistage water washing cleaning technology for one or more water washing tanks, and promptly the air outlet, top of previous water washing tank is communicated with the inlet mouth of back water washing tank bottom.
The sieve plate material is a paper or for silica gel or for granulated active carbon.
The biogas that pressurization stores is reduced to 0.05MPa～0.4MPa with the pressure of working off one's feeling vent one's spleen of storage vessel and is carried out pipe-line transportation through the one or many step-down, through a step-down, biogas pressure is reduced to 2～5KPa again, can be transported to the biogas burner.
Alkaline solution is the mixed solution of unslaked lime and water, and the mass ratio of unslaked lime and water is 1:3～9.By every cubic metre not purifying marsh gas need 0.6-1.2kg unslaked lime amount calculate needs the unslaked lime amount (with every cubic metre not purifying marsh gas be unit, the volume of removing carbonic acid gas accounts for not that the 20-40% of purifying marsh gas volume and the utilization ratio of calcium oxide are basis by 80%).
Alkaline solution is a sodium hydroxide solution, and the mass ratio of sodium hydroxide and water is 1:2～10.By every cubic metre not purifying marsh gas need the 0.8-1.6kg amount of sodium hydroxide calculate the sodium hydroxide usage quantity (with every cubic metre not purifying marsh gas be unit, the volume of removing carbonic acid gas accounts for not that the 20-40% of purifying marsh gas volume and the utilization ratio of sodium hydroxide are basis by 80%).
Alkali cleaning is multistage alkali cleaning purification process for one or more caustic treaters are composed in series, and promptly the air outlet, top of previous caustic treater is communicated with the inlet mouth of back caustic treater bottom.
Obviously improve through the biogas purity that provides after the present invention's purification, foreign matter contents such as hydrogen sulfide, carbonic acid gas, steam significantly reduce, and methane content increases substantially, methane content can reach more than 70% in the biogas, the highest can reaching more than 95%, because hydrogen sulfide content is low, the burning free from extraneous odour.Simultaneously, because CO
2Removal, also improved the combustion value of unit volume biogas.The every cubic metre of thermal value of biogas that does not purify or simply purify only is 20800～23600 joules, and 30～45% carbon dioxide impurities will be taken away a large amount of heats in the combustion gas simultaneously, cause combustion heat value low, and the flame local temperature is low; Be about 27200～34000 joules through every cubic metre of thermal value of purified marsh gas of the present invention, add that calorific loss is little, combustion heat value height, flame local temperature height.
The present invention will purify back biogas and carry out one or more levels compression storage, then through one or more levels pressure regulation, and by pipe-line transportation to the user maybe will compress the biogas that stores earlier through vehicle-mounted be delivered to the strange land after again through one or more levels pressure regulation, and by pipe-line transportation to the user, this is the invention of a kind of brand-new technology.Make source of the gas concentrate, stablize, can build up cities and towns, the large, medium and small air feed engineering in population center, realize air feed target stable, long-range, mass-producing, thereby be particularly suitable for mass-producing, the marketization, commercial operation.
If the present invention puts into operation, will change over input cost height, waste is serious, income is low shortcoming, greatly promote the enforcement and the new countryside construction of ecology homestead rich people plan.It is integrated to form the biogas production, supply and sales, the business-like marsh gas engineering of managed operation.
Embodiment
Below in conjunction with embodiment, the present invention is done to describe further.
Embodiment 1:
Marsh gas purifying, pressurization store and the delivery technology method, comprise the steps
A, washing
The inlet mouth of biogas to be clean by the water washing tank bottom fed in the jar, discharge by the air outlet of tank top; The water yield in the described water washing tank is 1/2～2/3 of a tank volume;
Washing is composed in series multistage water washing cleaning technology for one or more water washing tanks, and promptly the air outlet, top of previous water washing tank is communicated with the inlet mouth of back water washing tank bottom.
B, dehydration
Feed in the jar through the inlet mouth of the biogas behind the water washing cleaning, discharge by the air outlet of tank top by the water knockout bottom; The multi-layer absorbent sieve plate is arranged in the described water knockout; The sieve plate material is a paper or for silica gel or for granulated active carbon.
Biogas will make moisture wherein be absorbed, be blocked through the effect of multilayer sieve plate, thereby reaches the purpose of dehydration.Sieve plate can drying in the water knockout (dry, airing or oven dry) back repeat function.
The amount that each water knockout can dewater can be decided by the suction situation of the visual window observation sieve plate of water knockout, can shut down the taking-up sieve plate and carry out drying and prepare against and reuse after all sieve plates suction water.
C, pressurization store
The compressed machine jar of dehydration back biogas is gone into air container, and storage pressures range is 0.1～10Mpa.
D, biogas are carried
Can use after the biogas process one or many step-down that pressurization stores.Biogas in the storage vessel at first passes through the one or many step-down, make the pressure of working off one's feeling vent one's spleen of storage vessel reduce in 0.05MPa～0.4MPa scope, biogas in this pressure range is delivered to surge tank (pressure regulating box) or relief valve through transport pipe, pressure regulation once more through surge tank (pressure regulating box) or relief valve, make and reduce to 2KPa～5KPa in the 0.05MPa～0.4MPa scope of pressure from course of conveying, this pressure biogas enters each user, and makes each user reach needed applying pressure.As the applying pressure that transfers to gas-cooker, gas heater is 2KPa.
In said process, after starting compressor operating, compressor will aspirate biogas in the methane-generating pit, the biogas that produces in the methane-generating pit is sucked up to the tank top from the bottom of water washing tank and comes out like this, making biogas drive the interior water of water washing tank stirs, impel biogas and water thorough mixing, thereby remove impurity such as particulate matter in ammonia, hydrogen sulfide and the biogas.Can reach 70～85% through methane content in the biogas after washing, the dehydration, in the biogas in ammonia, hydrogen sulfide and the biogas impurity such as particulate matter can remove more than 90%.
Because the water consumption in the water washing tank has determined the volume of energy purifying marsh gas; again according to the predetermined pressurized gas speed (flow) of compressor or the gas meter before being installed at compressor specially can calculate purifying marsh gas volume; when the purifying marsh gas volume reaches the biogas volume that can purify, compressor shutdown.At this moment can the fetch boiling water tapping valve of cleaning of evaporator has absorbed the water of biogas impurity in the drainage water cleaning of evaporator, reload the water that has calculated consumption, can carry out the next round washing.
Special requirement: region of interest such as the pipe connection at each position, gate valve will seal in the water washing process, are inhaled in the biogas to prevent outside air.
Cylindrical, spherical or other shape that air container can be designed to.The maximum gas storage water capacity of single air container is determined according to the design needs.Air container can be provided with one or more according to practical situation.Air container has pneumatic outlet to link to each other with the biogas transport pipe.Storage gas in this air container can directly be transported to the user by gas pipe line, also can be used as movably air container, can deliver to the user again after this air container is transported to the strange land with vehicle-mounted.The connection of the design of air container, installation, turnover feed channel and the related request of vehicle-mounted transportation are all carried out with reference to national standard " Code for design of city gas engineering " GB50028-2006.
In addition: in the actual biogas course of conveying, if it is far away or because of the river that biogas produces ground and user's distance, landform such as mountains and rivers intercept or because of certain cause specific should not biogas purify with producing compress storage biogas directly by pipe-line transportation to the user, can build an air container in addition on all ground of user, to be transported to the on-site air container of user place in the air container that biogas contains purifying marsh gas with producing with the method for vehicle-mounted transportation, by pipeline these two air container are coupled together, like this can be in the on-site air container of user with the biogas unloading of vehicle-mounted transportation, pass through pressure regulation again, make the pressure of working off one's feeling vent one's spleen of user location air container reduce to and be delivered to surge tank (pressure regulating box) or relief valve in 0.05MPa～0.4MPa scope, pass through the pressure regulation of surge tank (pressure regulating box) or relief valve again, make and reduce to 2KPa～5KPa in the 0.05MPa～0.4MPa scope of pressure from course of conveying, this pressure biogas enters each user, and make each user reach needed applying pressure, as transfer to natural gas range, the applying pressure of Sweet natural gas water-heater is 2KPa.
Every requirement of selection, connection, installation and the vehicle-mounted transportation air container of the gas pipe line in the course of conveying, surge tank (pressure regulating box), relief valve etc. is all carried out with reference to national standard " Code for design of city gas engineering " GB50028-2006.
Embodiment 2:
Marsh gas purifying, pressurization store and the delivery technology method, comprise the steps
A, washing
Washing process is with embodiment 1.
Biogas after the washing feeds alkali cleaning in the caustic treater by the inlet mouth of caustic treater bottom.
B, alkali cleaning
Biogas after washing is handled is fed in the caustic treater by the inlet mouth of caustic treater bottom, is discharged by the venting port at caustic treater top, enters water knockout again; Alkaline solution amount in the caustic treater is 1/2～2/3 of a tank volume; Alkaline solution is the mixed solution of unslaked lime and water, and the mass ratio of unslaked lime and water is 1:3～9.By every cubic metre not purifying marsh gas need 0.6-1.2kg unslaked lime amount calculate needs the unslaked lime amount (with every cubic metre not purifying marsh gas be unit, the volume of removing carbonic acid gas accounts for not that the 20-40% of purifying marsh gas volume and the utilization ratio of calcium oxide are basis by 80%).
If adopt more than 1 caustic treater during purifying marsh gas, some caustic treaters can be together in series, biogas after the washing enters from first caustic treater bottom, come out to enter the 2nd caustic treater bottom again from the top, biogas is successively by a plurality of caustic treater alkali cleanings, last caustic treater air outlet links to each other with the inlet mouth of water knockout, and the water knockout air outlet links to each other with compressor inlet and gets final product.
C, dehydration
Dewatering process is with embodiment 1
D, pressurization store
The pressurization storage process is with embodiment 1.
E, biogas are carried
Delivery technology is with embodiment 1.
In above-mentioned technological process, compressor is with the biogas in the pump up water cleaning of evaporator after starting compressor, biogas after the washing is sucked up to the tank top at the bottom of the caustic treater and comes out like this, make biogas drive milk of lime and in caustic treater, stir and further mix, thereby remove impurity such as carbonic acid gas in the biogas, hydrogen sulfide with biogas.Methane content can reach 80～90% in washing-alkali cleaning-dewatering process purified marsh gas, in the biogas in ammonia, hydrogen sulfide and the biogas impurity such as particulate matter can remove more than 95%.
Because the milk of lime consumption in the caustic treater has determined the volume of energy purifying marsh gas; again according to the predetermined pressurized gas speed (flow) of compressor or the gas meter before being installed at compressor specially can calculate purifying marsh gas volume; when the purifying marsh gas volume reaches the biogas volume that can purify, compressor shutdown.At this moment can open the tapping valve of caustic treater, discharge the milk of lime that has absorbed biogas impurity in the caustic treater, reload new milk of lime, can carry out the next round alkali cleaning.
Region of interest such as the pipe connection at each position, gate valve all will seal in the whole alkaline cleaning procedure, are inhaled in the biogas to prevent air.
Embodiment 3:
Marsh gas purifying, pressurization store and the delivery technology method, comprise the steps
A, washing
Washing process is with embodiment 1.
Biogas after the washing feeds alkali cleaning in the caustic treater by the inlet mouth of caustic treater bottom.
B, alkali cleaning
Biogas after washing is handled is fed in the caustic treater by the inlet mouth of caustic treater bottom, is discharged by the venting port at caustic treater top, enters water knockout again; Alkaline solution amount in the caustic treater is jar molten long-pending 1/2～2/3; Alkaline solution is a sodium hydroxide solution, and the mass ratio of sodium hydroxide and water is 1:2～10.By every cubic metre not purifying marsh gas need the 0.8-1.6kg amount of sodium hydroxide calculate the sodium hydroxide usage quantity (with every cubic metre not purifying marsh gas be unit, the volume of removing carbonic acid gas accounts for not that the 20-40% of purifying marsh gas volume and the utilization ratio of sodium hydroxide are basis by 80%).
If adopt more than 1 caustic treater during purifying marsh gas, some caustic treaters can be together in series, biogas after the washing enters from first caustic treater bottom, come out to enter the 2nd caustic treater bottom again from the top, biogas is successively by a plurality of caustic treater alkali cleanings, last caustic treater air outlet links to each other with the inlet mouth of water knockout, and the water knockout air outlet links to each other with compressor inlet and gets final product.
C, dehydration
Dewatering process is with embodiment 1
D, pressurization store
The pressurization storage process is with embodiment 1.
E, biogas are carried
Delivery technology is with embodiment 1.
In above-mentioned technological process, compressor is with the biogas in the pump up water cleaning of evaporator after starting compressor, biogas after the washing is sucked up to the tank top at the bottom of the caustic treater and comes out like this, make biogas drive sodium hydroxide solution and in caustic treater, stir and further mix, thereby remove impurity such as carbonic acid gas in the biogas, hydrogen sulfide with biogas.Methane content can reach 85～95% in washing-alkali cleaning-dewatering process purified marsh gas, in the biogas in ammonia, hydrogen sulfide and the biogas impurity such as particulate matter can remove more than 98%.
Because the sodium hydroxide solution consumption in the caustic treater has determined the volume of energy purifying marsh gas; again according to the predetermined pressurized gas speed (flow) of compressor or the gas meter before being installed at compressor specially can calculate purifying marsh gas volume; when the purifying marsh gas volume reaches the biogas volume that can purify, compressor shutdown.At this moment can open the tapping valve of caustic treater, discharge the sodium hydroxide solution that has absorbed biogas impurity in the caustic treater, reload new sodium hydroxide solution, can carry out the next round alkali cleaning.
Region of interest such as the pipe connection at each position, gate valve all will seal in the whole alkaline cleaning procedure, are inhaled in the biogas to prevent air.
Claims (7)
1, marsh gas purifying, pressurization storage and delivery technology method is characterized in that: comprise the steps
A, washing
The inlet mouth of biogas to be clean by the water washing tank bottom fed in the jar, discharge by the air outlet of tank top; The water yield in the described water washing tank is 1/2～2/3 of a tank volume;
B, alkali cleaning
The inlet mouth of biogas to be clean by the caustic treater bottom fed in the jar, discharge by the air outlet of tank top; Alkaline solution amount in the described caustic treater is 1/2～2/3 of a tank volume;
C, dehydration
Biogas to be drained off is fed in the jar by the inlet mouth of water knockout bottom, is discharged by the air outlet of tank top; The multi-layer absorbent sieve plate is arranged in the described water knockout;
D, pressurization store
The compressed machine of dehydration back biogas is pressed into air container, and storage pressures range is 0.1～10MPa;
E, conveying
The biogas that is stored in the container uses to the user through decompression and by pipe-line transportation;
Described alkaline solution is a sodium hydroxide solution, and the mass ratio of sodium hydroxide and water is 1:2～10, or the mixed solution of unslaked lime and water, and the mass ratio of unslaked lime and water is 1:3～9.
2, marsh gas purifying according to claim 1, pressurization store and the delivery technology method, it is characterized in that: described washing is multistage water washing cleaning technology for one or more water washing tanks are composed in series, and promptly the air outlet, top of previous water washing tank is communicated with the inlet mouth of back water washing tank bottom.
3, marsh gas purifying according to claim 1, pressurization store and the delivery technology method, it is characterized in that: described sieve plate material is a paper or for silica gel or be granulated active carbon.
4, marsh gas purifying according to claim 1, pressurization store and the delivery technology method, it is characterized in that: the biogas that described pressurization stores is through the one or many step-down, the pressure of working off one's feeling vent one's spleen of storage vessel is reduced to 0.05MPa～0.4MPa carry out pipe-line transportation, again through a step-down, biogas pressure is reduced to 2～5KPa, can be transported to the biogas burner.
5, marsh gas purifying according to claim 1, pressurization store and the delivery technology method, it is characterized in that: described unslaked lime and water blended alkaline solution need 0.6-1.2kg unslaked lime amount to calculate by purifying every cubic metre of biogas.
6, marsh gas purifying according to claim 1, pressurization store and the delivery technology method, it is characterized in that: described sodium hydroxide and water blended alkaline solution need the 0.8-1.6kg amount of sodium hydroxide to calculate by purifying every cubic metre of biogas.
7, according to claim 5 or 6 described marsh gas purifyings, pressurization storage and delivery technology method, it is characterized in that: described alkali cleaning is multistage alkali cleaning purification process for one or more caustic treaters are composed in series, and promptly the air outlet, top of previous caustic treater is communicated with the inlet mouth of back caustic treater bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100969985A CN100469888C (en) | 2006-10-24 | 2006-10-24 | Process for purification, pressurized storage, and transportation of marsh gas |
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| CNB2006100969985A CN100469888C (en) | 2006-10-24 | 2006-10-24 | Process for purification, pressurized storage, and transportation of marsh gas |
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| CN1966692A CN1966692A (en) | 2007-05-23 |
| CN100469888C true CN100469888C (en) | 2009-03-18 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306801B (en) * | 2008-01-31 | 2011-08-31 | 日照金禾博源生化有限公司 | Process for recovering hydrogen sulfide form anaerobic fermentation methane |
| CN101659889B (en) * | 2008-08-25 | 2012-09-26 | 来铁路 | Methane purifying comprehensive utilization technology |
| CN102321672B (en) * | 2010-06-04 | 2014-06-18 | 陈乃富 | Preacidizing method for steam-exploded material washing liquid for biogas production by anaerobic fermentation |
| CN102382698A (en) * | 2011-04-29 | 2012-03-21 | 王嘉兴 | Method for producing calcium carbonate during marsh gas purification |
| CN103883870B (en) * | 2014-04-10 | 2015-11-11 | 刘舰林 | A kind of membrane type biogas storage device |
| CN112626131B (en) * | 2021-02-05 | 2023-03-24 | 江西正合环保工程有限公司 | Multi-stage gradient methane centralized gas supply method |
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2006
- 2006-10-24 CN CNB2006100969985A patent/CN100469888C/en not_active Expired - Fee Related
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| 《沼气技术及应用》. 张全国，252-300，化学工业出版社. 2005 |
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