CN101104824A - Method and device for producing synthetic natural gas from organic waste water - Google Patents
Method and device for producing synthetic natural gas from organic waste water Download PDFInfo
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- CN101104824A CN101104824A CNA2007101191383A CN200710119138A CN101104824A CN 101104824 A CN101104824 A CN 101104824A CN A2007101191383 A CNA2007101191383 A CN A2007101191383A CN 200710119138 A CN200710119138 A CN 200710119138A CN 101104824 A CN101104824 A CN 101104824A
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- biogas
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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 a method of producing natural gas from organic wastewater, which comprises the following steps: 1. making biogas by anaerobic treating with organic wastewater; 2. pressurizing the gas to 0.01-0.03MPa after collecting, cooling and dehydration; 3. removing impurities like sulfide and carbon dioxide from the compressed gas. Synthetic natural gas with a methane concentration of over ninety percent can be obtained by the technology which can further produce qualified CNG and LNG. The invention plays an important role in fully utilizing resources and increasing economic benefits by reducing pollution to the environment and green house gas emission.
Description
Technical field
The present invention relates to a kind of processing method of utilizing organic waste water production synthetic natural gas, particularly a kind of device of realizing this processing method.Specifically, the present invention relates to a kind of organic waste water that utilizes and comprise industrial organic waste water, ight soil organic waste water, utilize anaerobic ferment process to produce the processing method and the device of biogas and purifying treatment production synthetic natural gas, belong to the synthetic natural gas field.
Background technology
Oil price in recent years significantly rises and fast development of Chinese economy, causes domestic petroleum and Gas Prices constantly to rise, and is example with the Sweet natural gas, and coastal some city every side's Sweet natural gas price reaches 5 yuan in the Eastern China.So energy shortage situation has also been impelled the extensive concern of people to renewable energy utilization.In addition, global climate aggravated unusually in recent years, people are more and more higher to the cry of reduction of greenhouse gas discharge, both can reduce the discharging that environmental pollution can reduce greenhouse gases and utilize anaerobic fermentation technology processing industrial organic waste water and fecal sewage to produce biogas, reclaim biogas and after purifying, can produce synthetic natural gas again, realize the target of environmental protection, environment and economic three incomes simultaneously.The main component of biogas is: methane accounts for 50%, and carbonic acid gas accounts for 50%, and other has impurity such as a small amount of sulfide, oxygen, hydrogen, moisture.
Chinese industrial organic waste water 2006 annual emissions reach 3,000,000,000 tons, mainly come from light industry such as alcohol, beer, yellow rice wine, liquor, starch, monosodium glutamate, citric acid, beverage and papermaking, pharmacy, butcher, flour, vegetables oil, soy sauce, can and rubber industry also have the organic waste water discharging, the livestock culture industry of live pig, poultry and the ox etc. of China also gives off a large amount of organic waste waters every year, these organic waste water serious environment pollutions if can realize that recycling will have huge historic significance and economic benefit.
In sum, the inventor utilizes the organic waste water synthetic natural gas to carry out research in depth, has finished the present invention then.
Summary of the invention
The purpose of this invention is to provide the low processing method of utilizing industrial organic waste water and livestock culture industry waste water production synthetic natural gas of a kind of less energy-consumption, high-recovery, safety, facility investment expense.
The objective of the invention is to realize by following process technology scheme.
A kind of method by organic waste water production synthetic natural gas, it comprises the steps:
(1) utilizes anaerobic treatment process to handle organic waste water and produce biogas;
(2) biogas that produces is carried out being collected in the gas cabinet of pressure-fired after the cooled dehydrated, be forced into 0.01～3.0Mpa;
(3) biogas after will compressing removes impurity such as sulfide and carbonic acid gas by purification system, obtains synthetic natural gas.
The anaerobic treatment process of the production biogas described in the step (1) is upflow anaerobic sludge blanket reactor technology (UASB), full mixed anaerobic technology (CSTR), anaerobic grain sludge expanded bed technology (EGSB), anaerobism internal recycle reaction process (IC), anaerobic filter technology (AF) or anaerobic composite bed technology (UBF).
The method that purification system described in the step (3) removes sulfide and carbonic acid gas is pressure swing adsorption process (PSA) or solvent absorption.
The described solvent that uses in the solvent absorbing method of impurity such as sulfide and carbonic acid gas in the biogas that removes is propylene carbonate (PC) or pure amine solvent.
A kind of optimized technical scheme is characterized in that, the described PSA of utilization removes in the method for impurity such as sulfide and carbonic acid gas in the biogas, and its working pressure is 0.2～0.8Mpa.
A kind of optimized technical scheme, it is characterized in that, propylene carbonate in the described solvent absorption, it is the solvent that in PC, adds poly-ethyl ether of 0.1～10% morpholinyl hydroxyethyl and/or the poly-ethyl ether of two morpholinyl, wherein the polymerization degree of poly-ethyl ether is 1,2,3 or 4, or glycol system morpholine is high boiling point by-products produced, and its working pressure is 0.8～7.0Mpa.
A kind of optimized technical scheme is characterized in that, the pure amine solvent in the described solvent absorption that removes impurity such as sulfide and carbonic acid gas in the biogas is N methyldiethanol amine (MDEA), and its working pressure is 0.01～0.8Mpa.
A kind of optimized technical scheme is characterized in that, the oxygen concentration in the biogas of described collection is passed through the pressure-controlling of control anaerobic reactor between 0～1%.
Another object of the present invention provides a kind of used device of method that utilizes organic waste water production synthetic natural gas.
Above-mentioned purpose of the present invention reaches by the following technical programs:
A kind of used device of method that utilizes organic waste water production synthetic natural gas, it comprises: anaerobic reactor, collecting methane system, cooling separator, compression system, purification system, Sweet natural gas gathering system, natural pressure compression system etc., it is characterized in that, organic waste water produces biogas by anaerobic reactor and enters cooling separator and carry out after cooled dehydrated separates, collect in the collecting methane system, enter purification system after the compression, remove impurity, produce synthetic natural gas, further handle obtaining compressed natural gas.
A kind of optimized technical scheme is characterized in that, described anaerobic reactor is connected with a pressure controller, with the control oxygen concentration.
A kind of optimized technical scheme is characterized in that, described purification system is pressure-swing absorption apparatus or solvent absorbing tower.
Described collecting methane system is the gas cabinet of a pressure-fired; Pack in the described solvent absorbing tower PC or pure amine solvent.
Organic waste water anaerobic treatment process in the invention can voluminous efficiently biogas, simultaneously the Control for Oxygen Content in the biogas that is produced in low scope as between 0～1%, this makes that follow-up purifying technique operation is safer, productive expense is lower, because during the biogas too high oxygen level if with the PSA methane of purifying, might in purification process, reach the explosive range of methane, cause the hidden danger of keeping the safety in production.Adopt solvent absorption, too high oxygen level easily causes the corrosion of equipment and the degraded of solvent in the biogas.But compare with general membrane separation process, PSA method and solvent absorption remove impurity such as sulfide in the biogas and carbonic acid gas and all have higher methane recovery.
When utilizing the PSA method to separate impurity such as sulfide in the biogas and carbonic acid gas in the present invention, account for 50% content because of carbonic acid gas in the biogas, be save compressed power, should under alap working pressure, move, on the other hand since most biogas production device output at 100～1000m
3Between/the h, too high working pressure makes that gas flow is very little, cause the PSA by-pass valve control to make difficulty, thereby facility investment is significantly risen.When utilizing the methane in the PSA purifying biogas, adopt the low operating pressure of 0.2～0.8Mpa for this reason.
When utilizing solvent absorption to remove impurity such as sulfide in the biogas and carbonic acid gas in the present invention, can use higher working pressure than adopting the PSA method, but for follow-up when synthetic natural gas is changed into natural gas liquids, higher working pressure can save the technology of subsequent compression machine, make the synthetic Sweet natural gas in a suitable temperature range, liquefy, to reduce facility investment and to reduce the production run cost.
When adopting the PC solvent absorption, to compare with other solvent absorption, its solvent reclamation does not need public works such as steam and low-temperature receiver, only needs pressure change and air just can realize regeneration.Add 0.1～10% poly-ethyl ether of morpholinyl hydroxyethyl and/or the poly-ethyl ether of two morpholinyl in the PC solvent, the polymerization degree of wherein poly-ethyl ether is 1,2,3 or 4 or glycol system morpholine high boiling point by-products produced, this additive can be degraded effectively and be removed hydrogen sulfide in the biogas, removal efficiency can improve more than 10 times than the PC method, and the efficient that removes carbonic acid gas remains unchanged substantially.
When impurity such as sulfide in adopting hydramine solvent removal biogas and carbonic acid gas are chemical absorption method because of it, can 0.05～0.8Mpa than carrying out under the low operating pressure, but need steam regeneration lyosorption, can adopt this method if having cheaply and under the condition of the steam that is easy to get for this reason, with save compressed power, reduce the production run cost.
When adopting the MDEA solvent absorption to remove impurity such as sulfide in the biogas and carbonic acid gas, compare with other hydramine method, more efficient, equipment corrosion is lower.
Advantage of the present invention is, it is big to adopt anaerobic treatment process to produce the biogas ability in the present invention to organic waste water, and oxygen level is low in the biogas, and when using PSA to remove in the biogas impurity such as sulfide and carbonic acid gas, compression power consumption is low, the level of automation height.When adopting solvent method to remove above-mentioned impurity, when propylene carbonate was made solvent, solvent reclamation did not need steam, do not need cold, thereby facility investment was little yet, can remove hydrogen sulfide better behind the interpolation auxiliary agent.And when adopting N methyldiethanol amine to make solvent,, can under lower working pressure, carry out save compressed power although solvent reclamation needs steam.All can produce methane concentration by above-mentioned technology and reach synthetic natural gas more than 90%, further can produce qualified CNG and LNG.Therefore the present invention not only can reduce environmental pollution but also can reduce the discharging of greenhouse gases, played a very important role to realizing making full use of resource and improving economic return.
Description of drawings
Fig. 1 is the process flow sheet of the industrial organic waste water synthetic natural gas of production starch
Fig. 2 is the process flow sheet of the industrial organic waste water synthetic natural gas of production alcohol
Fig. 3 is the process flow sheet of the industrial organic waste water synthetic natural gas in paper mill
Fig. 4 is the process flow sheet of aquaculture sewage synthetic natural gas
Below by description of drawings and embodiment the utility model is described further, but and does not mean that restriction the utility model protection domain.
Embodiment
Embodiment 1
With the cassava is the industrial organic waste water of raw material production starch, produces biogas with the UASB method, daily output biogas 50000m
3, wherein, CH
450%, CO
245%, H
2S 300ppm, the biogas of production is extracted out from airtight anaerobic jar by blower fan, enters in the biogas gas holder control O after the cooled dehydrated
20.1%, the compressed machine of biogas that goes out gas holder is compressed to 1.0Mpa and enters PC solvent method refining plant, removes sulfide and carbonic acid gas in the biogas, the synthetic natural gas of output 0.8～0.9Mpa, CH
4＞95%, tolerance 2.5 ten thousand NM
3/ d, methane recovery＞97%.Be pressurized to 25Mpa once more through high pressure compressor, produce qualified CNG.
Embodiment 2
The organic waste water anaerobic technique of producing alcohol adopts the CSTR method to produce biogas, wherein, and CH
449%, CO
250%, H
2S 1000ppm, the biogas of production is extracted out from airtight anaerobic jar by blower fan, enters the biogas cabinet after the cooled dehydrated, control O
20.3%, the compressed machine of biogas that goes out gas holder is compressed to 0.4Mpa and enters the PSA device, produces the synthetic natural gas of 0.3～0.35Mpa, CH
4＞95%, methane recovery＞90% further is pressurized to 0.6Mpa and enters gas ductwork.
Embodiment 3
Paper mill organic waste water anaerobic technique adopts the EGSB method to produce biogas, wherein, and CH
445%, CO
253%, H
2S 800ppm, the biogas of production is extracted out from airtight anaerobic jar by blower fan, enters the biogas gas holder after the cooled dehydrated, control O
20.9%, the compressed machine of biogas that goes out gas holder is compressed to 0.1Mpa, enters MDEA method refining plant, removes sulfide and carbonic acid gas in the biogas, produces the synthetic natural gas of 0.05～0.08Mpa, CH
4＞98%, methane recovery＞97% is produced LNG after the supercharging refrigeration.
Embodiment 4
Large-scale cattle farm cow dung sewage is produced biogas with the UASB method, wherein, and CH
451%, CO
247%, H
2S2000ppm, the biogas of producing enter the biogas gas holder after extracting cooled dehydrated by blower fan out from airtight anaerobic jar, control O
20.7%, the compressed machine of biogas that goes out gas holder is compressed to 2.5Mpa and enters PC solvent method refining plant; Add 1% the poly-ethyl ether of morpholinyl hydroxyethyl in the PC solvent, the synthetic natural gas of output 2.2～2.4Mpa behind purification sulfide and the carbonic acid gas, CH
4＞97%, methane recovery＞95%.Be pressurized to 25Mpa once more through high-pressure unit, produce qualified CNG.
Claims (10)
1. method by organic waste water production synthetic natural gas, it comprises the steps:
(1) utilizes anaerobic treatment process to handle organic waste water and produce biogas;
(2) biogas that produces is carried out being collected in the gas cabinet of pressure-fired after the cooled dehydrated, is forced into 0.01～3.0Mpa:
(3) biogas after will compressing removes impurity such as sulfide and carbonic acid gas by purification system, obtains synthetic natural gas.
2. the method by the organic waste water synthetic natural gas according to claim 1 is characterized in that, the method that the purification system described in the step (3) removes sulfide and carbonic acid gas is pressure swing adsorption process (PSA) or solvent absorption.
3. the method by the organic waste water synthetic natural gas according to claim 1 and 2 is characterized in that the described PSA of utilization removes the method for impurity such as sulfide and carbonic acid gas in the biogas, and working pressure is 0.2～0.8Mpa.
4. according to claim 1 or 2 each described methods, it is characterized in that the solvent that uses in the described solvent absorbing method is propylene carbonate (PC) or pure amine solvent by the organic waste water synthetic natural gas.
5. the method by the organic waste water synthetic natural gas according to claim 4, it is characterized in that, propylene carbonate in the described solvent absorption is the solvent that adds poly-ethyl ether of 0.1～10% morpholinyl hydroxyethyl and/or the poly-ethyl ether of two morpholinyl in PC, wherein the polymerization degree of poly-ethyl ether is 1,2,3 or 4, or glycol system morpholine is high boiling point by-products produced, and its working pressure is 0.8～7.0Mpa
6. the method by the organic waste water synthetic natural gas according to claim 4 is characterized in that, the pure amine solvent in the described solvent absorption is N methyldiethanol amine (MDEA), and its working pressure is 0.01～0.8Mpa.
7. the method by the organic waste water synthetic natural gas according to claim 1 is characterized in that the oxygen concentration in the biogas of the collection described in the step 2 is controlled between 0～1%.
8. according to claim 1 by the used device of the method for organic waste water synthetic natural gas, it comprises: anaerobic reactor, collecting methane system, cooling separator, compression system, purification system, Sweet natural gas gathering system, natural pressure compression system, it is characterized in that, organic waste water produces biogas by anaerobic reactor and enters cooling separator and carry out after cooled dehydrated separates, collect in the Sweet natural gas gathering system by the blower fan extraction, enter purification system after the compression, after removing impurity, produce synthetic natural gas, further handle obtaining compressed natural gas.
9. according to claim 8ly it is characterized in that by the used device of the method for organic waste water synthetic natural gas described anaerobic reactor is connected with a pressure controller, with the control oxygen concentration.
10. according to claim 8ly it is characterized in that by the used device of the method for organic waste water synthetic natural gas described purification system is pressure-swing absorption apparatus or solvent absorbing tower.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101191383A CN101104824A (en) | 2007-07-16 | 2007-07-16 | Method and device for producing synthetic natural gas from organic waste water |
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|---|---|---|---|
| CNA2007101191383A CN101104824A (en) | 2007-07-16 | 2007-07-16 | Method and device for producing synthetic natural gas from organic waste water |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074136A (en) * | 2013-01-16 | 2013-05-01 | 东莞新奥燃气有限公司 | System and process method for producing natural gas by beer biogas |
| CN103212183A (en) * | 2013-05-11 | 2013-07-24 | 桂林理工大学 | Method for effectively neutralizing lime waste |
| CN104560252A (en) * | 2013-10-28 | 2015-04-29 | 中国石油化工股份有限公司 | Natural gas desulfurization and decarbonization agent |
| CN106693639A (en) * | 2017-01-03 | 2017-05-24 | 北京首钢朗泽新能源科技有限公司 | Treatment method and system for waste gas and waste liquid in bio-fermentation production of fuel ethanol |
-
2007
- 2007-07-16 CN CNA2007101191383A patent/CN101104824A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074136A (en) * | 2013-01-16 | 2013-05-01 | 东莞新奥燃气有限公司 | System and process method for producing natural gas by beer biogas |
| CN103212183A (en) * | 2013-05-11 | 2013-07-24 | 桂林理工大学 | Method for effectively neutralizing lime waste |
| CN104560252A (en) * | 2013-10-28 | 2015-04-29 | 中国石油化工股份有限公司 | Natural gas desulfurization and decarbonization agent |
| CN104560252B (en) * | 2013-10-28 | 2017-02-01 | 中国石油化工股份有限公司 | Natural gas desulfurization and decarbonization agent |
| CN106693639A (en) * | 2017-01-03 | 2017-05-24 | 北京首钢朗泽新能源科技有限公司 | Treatment method and system for waste gas and waste liquid in bio-fermentation production of fuel ethanol |
| CN106693639B (en) * | 2017-01-03 | 2019-06-25 | 北京首钢朗泽新能源科技有限公司 | The processing method and system of waste gas and waste liquid in the production of biological fermentation process preparing fuel ethanol |
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Open date: 20080116 |