CN104910988A - Green environment-friendly biogas resource diversified utilization process - Google Patents
Green environment-friendly biogas resource diversified utilization process Download PDFInfo
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- CN104910988A CN104910988A CN201510252998.9A CN201510252998A CN104910988A CN 104910988 A CN104910988 A CN 104910988A CN 201510252998 A CN201510252998 A CN 201510252998A CN 104910988 A CN104910988 A CN 104910988A
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Abstract
The invention provides a green environment-friendly biogas resource diversified utilization process, and relates to the field of petrochemical engineering. According to the invention, a membrane separation technology, a catalytic combustion technology and a heat recovery system are integrated into an integral whole. Low-grade city gas and vehicle high-end compressed natural gas are separated by a primary two-stage membrane. Through catalytic combustion, residual methane is converted, and greenhouse gas emission is reduced. Through the heat recovery system, by-production of hot water and medium-pressure steam is realized, such that biogas resource green environment-friendly diversified utilization is realized. With the process provided by the invention, a methane yield is higher than 95%; a comprehensive utilization rate is higher than 98%; and product production cost is lower than 0.7yuan/standard volume. According to the invention, a flexible, highly efficient green environment-friendly utilization process with the advantages of low cost, easy operation and easy maintenance is provided for township biogas resources with the characteristics of small scale, large fluctuations and decentralized production. The process has a great significance for promoting the industrialization, scale expansion and commercialization of biogas utilization of our nation.
Description
Technical field
The present invention relates to a kind of Methane Resources diversification utilization technique of environmental protection, belong to petrochemical industry.This separating technology utilizes the low-grade gas of one-level two-segment film separating unit coproduction and automobile-used high end compression Sweet natural gas, catalytic combustion system is utilized to transform methane remaining in tail gas, and by heat recovery system by-product hot water and middle pressure steam, thus environmental protection achieve the diversification utilization of Methane Resources.
Background technology
Due to the sharply increase of energy consumption, and the optimizing and revising of energy structure, the proportion of Sweet natural gas in China's energy expenditure constantly rises.2009, the proportion of Sweet natural gas in China's energy expenditure only had 3.8%, and according to the energy consumption structure adjustment aim of " 12 ", within 2015, this proportion will be increased to 8.3%.Finding the substitute gas product of non-fossil sources, is urgent problem of realizing this goal.At present, the municipal wastes that discharges every year of China more than 300,000,000 tons, human and animal excreta (moisture) about 4,000,000,000 tons, burn the crop material of waste more than 300,000,000 tons.Being transformed by these biomass efficients and can obtain about 2000 billion cubic meter biological methanes, is 2 times of China's gas production in 2010.Obviously, rational exploitation and utilization biomass resource, is translated into biological methane, is the important power-assisted that China advances energy structure optimizing adjustment.In addition, according to Copenhagen agreement, non-fossil energy accounts for the proportion of China primary energy source consumption, also by by 2009 8.3% be increased to 15.0% of the year two thousand twenty.The Appropriate application of biomass energy also will play the part of very important role in the process.
Enter the new millennium, China puts into the fund of biogas engineering every year on average more than 5,000,000,000 yuan.By the end of the year 2011, methane-generating pit for farm household will be more than 4,000 ten thousand, and medium-and-large-sized biogas engineering more than 2.7 ten thousand covers, and continues development with the rate of increase of annual 15% and 27% respectively.Generally, the production capacity of China's biogas engineering reaches the huge size of hundred billion cubes/year, if can these projects of Appropriate application, has vital role to the composition optimizes adjustment of AND ENERGY RESOURCES CONSUMPTION IN CHINA.
Although prospect is very grand, the methane-generating pit for farm household occupying biogas engineering overwhelming majority production capacity proposes challenge to the Appropriate application of these resources.At present, the household biogas in China rural area and the application mode of small-sized plant biogas mainly self-sufficient, domestic gas is provided.Although the biogas excess phenomenon that ubiquity is serious, because these biogas production capacities have small-scale, great fluctuation process and distributed production, be difficult to link directly with the demand of natural gas of industry.Moreover, methane is the very large gas of a kind of greenhouse gases effect, and its GWP value is 25 times of carbonic acid gas.The methane content of the scattered methane-generating pit waste in the whole nation, all directly loss, in air, is equivalent to discharge carbonic acid gas 3.6 hundred million tons every year substantially.
By the biogas obtained of fermenting, main containing methane (~ 50mol%), carbonic acid gas (~ 45mol%), saturated water vapor (~ 3%) and a small amount of air (<1%), and hydrogen sulfide (50 ~ 1000ppm).The superfluous production capacity of the scattered methane-generating pit in rural area, by separating-purifying deep processing, every year can the higher-grade Sweet natural gas of at least output 7,000,000,000 cubes, such as compressed natural gas used as vehicle fuel, its direct economic benefit is more than 2,000,000,000 yuan.Obviously, the industrialization of rational process for separating and purifying to biological methane is most important.
At present, common biogas process for separating and purifying has the conventional art such as absorption and sorption and low temperature separation process, and emerging gas membrane Seperation Technology.Consider the feature of the small-scale of the household biogas in China rural area and small-sized plant biogas, great fluctuation process and distributed production, conventional art due to scale adaptability and flexibility of operation not enough, be difficult to adapt to this kind of biogas production pattern.Gas membrane Seperation Technology have easy to operate, energy consumption is low, occupation area of equipment is little, etc. advantage, be more suitable for scattered Country Household Using Marsh Gas device and middle-size and small-size evaluation of biogas project on husbandry farms.
However, the membrane sepn methane purification technology that developed at present and great majority are grinding, its productive target often based on production higher-grade Sweet natural gas such as, compressed natural gas used as vehicle fuel, on the one hand, the handiness of producing is inadequate, is difficult to the characteristic adapting to Country Household Using Marsh Gas and small-sized plant biogas, and is not suitable for the demand characteristic of small towns energy market to civilian low-grade gas and automobile-used higher-grade compressed natural gas; On the other hand, separation costs is higher, is unfavorable for investment and the Cash Flow pattern of small-scale production process.Therefore, improve production chains further, reduce biogas deep processing productive expense, become the key point continuing development membrane sepn methane purification technology.In addition, methane purification technology by-product is containing the tail gas of a small amount of methane, and different according to technique, its content fluctuates usually between 1 ~ 5mol%, by the disadvantageous effect that process modification avoids methane losses to cause environment, it is also the problem that continuation development membrane sepn methane purification technology must be considered.
In sum, the deep processing and utilization of China's Country Household Using Marsh Gas and small-sized plant biogas, need the Methane Resources diversification utilization technique that exploitation can realize environmental protection badly, while raising resource utilization, reduction separating energy consumption and separation costs, avoid environmental pollution.
Summary of the invention
The object of the present invention is to provide a kind of Methane Resources diversification utilization technique of environmental protection.This technology utilization one-level two-segment film low-grade gas of separating unit coproduction and automobile-used high end compression Sweet natural gas, catalytic combustion system is utilized to transform methane remaining in tail gas, and by heat recovery system by-product hot water and middle pressure steam, thus realize environmental protection utilization and the diversification utilization of Methane Resources.Effectively prevent existing methane purifying technique problems faced: production chains is low, energy consumption is higher, do not meet small towns energy market demand, be not suitable for middle and small scale biogas engineering.
For achieving the above object, technical scheme provided by the invention is as follows:
A Methane Resources diversification utilization technique for environmental protection,
In pretreatment system 1, biogas removes solid particulate and liquid mist through compressor 1a supercharging, knot screen 1b, is warming up to the operational condition of membrane module, enters film separating system 2 through interchanger 1c;
In film separating system 2, the biogas that pretreatment system 1 exports enters one section of membrane separation apparatus 2a, and per-meate side is the carbonic acid gas containing a small amount of methane, enters catalytic combustion system 3; The low-grade domestic gas of retentate side output, shunts through splitter 2b, and a part exports as product introduction city gas pipe network, and rest part enters two-segment film separator 2c; Produce the product meeting compressed natural gas used as vehicle fuel, index GB18047-2000 at two-segment film separator 2c retentate side, per-meate side is the carbon dioxide enriched circulation gas that methane content is higher, returns biogas in pretreatment system 1 through compressor 1a import.
In catalytic combustion system 3, the per-meate side gas of one section of membrane separation apparatus 2a enters devulcanizer 3a; Gas after desulfurization enters mixing tank 3b together with air, then enters interchanger 3c and is warmed up to point of ignition, catalyzed conversion in catalytic combustion reactor 3d; The high-temperature tail gas that reactor 3d exports, heat of high temperature is reclaimed in interchanger 3f, output 5.0MPa middle pressure steam, the raw material of heatable catalytic combustion reactions in interchanger 3c, temperature is increased to point of ignition, in interchanger 3e, reclaims low-temperature heat quantity, output 70 ~ 90 DEG C of hot water, reclaim low-temperature heat quantity in interchanger 1c in pretreatment system 1, make biogas temperature reach 40 ~ 80 DEG C.
The methane content that described one section of membrane separation apparatus 2a oozes residual air is 80 ~ 90mol%, and it is >=97% that two-segment film separator 2c oozes residual air methane content;
After in described catalytic combustion system 3, tail gas carries out harmless treatment, methane content is down to below 100ppm.
Advantage of the present invention and beneficial effect:
The invention provides a kind of Methane Resources diversification utilization technique of environmental protection, take into full account raw material composition, the features such as product actual demand and energy distribution, by membrane sepn is become an organic whole with process set such as catalyticcombustions, and the mutually promoting of multiple technologies, mutual improvement, step purifying marsh gas and step heat recuperation, achieve the civilian biological methane of economic Environmentally-frielow-energy-consumptipolycarboxylic low-energy-consumptipolycarboxylic simultaneously needed for production small towns and automobile-used biological methane, co-production 70 DEG C of hot water and 5.0MPa middle pressure steam, owing to adopting the technique of membrane separation process and catalytic combustion method coupling in the present invention, make this technique compared with traditional biogas membrane sepn purifying technique, not only there is the advantages such as simple to operation and equipment volume is little, and also reduce separating-purifying energy consumption, improve economic benefit, and realize tail gas hazard-free and produce the diversification methane product meeting small towns Gas Market characteristic simultaneously, be more suitable for being applied to the biogas separating-purifying in the scattered household biogas project in small towns and evaluation of biogas project on husbandry farms.
Accompanying drawing explanation
Accompanying drawing is the principle flow chart of environmental type Methane Resources diversification utilization technique.
In figure: 1 pretreatment system; 1a compressor; 1b knot screen; 1c interchanger; 2 film separating systems; 2a mono-section of membrane separation apparatus; 2b splitter; 2c mono-section of membrane separation apparatus; 3 catalytic combustion system; 3a devulcanizer; 3b mixing tank; 3c interchanger; 3d catalyticreactor; 3e interchanger; 3f interchanger.
Embodiment
Below by way of specific examples, technical scheme of the present invention is described.
Embodiment 1:
Handling object: the biogas of large-scale evaluation of biogas project on husbandry farms, gas production rate is 500Nm
3/ h.
Biogas composition mol%:
| CH 4 | 53 | CO 2 | 44 | H 2O | 2 |
| O 2 | 0.2 | N 2 | 0.7 | H 2S | 800ppm |
The operational condition of one section of membrane separation apparatus 2a is: temperature 60 C, and pressure is 2.5MPa, and membrane area is 116m
2.
The operational condition of two-segment film separator 2c is: temperature 52 DEG C, and pressure is 2.48MPa, and membrane area is 140m
2.
Pressurized air volumetric flow rate is: 200Nm
3/ h
In this embodiment, civilian biological methane output is 2.4 × 10
5nm
3/ a, automobile-used biological methane output is 1.7 × 10
6nm
3/ a, 70 DEG C of hot water output is 3543t/a, 5.0MPa middle pressure steam output is 315t/a, and economic benefit is 3,100,000 yuan/a, and this technique can the biogas of the abundant large-scale evaluation of biogas project on husbandry farms of Multi-class propagation.
Embodiment 2:
Handling object: the biogas of the household biogas project of centralized recovery, yield is 1000Nm
3/ h.
Biogas composition mol%:
| CH 4 | 50 | CO 2 | 45 | H 2O | 3 |
| O 2 | 0.78 | N 2 | 1.04 | H 2S | 800ppm |
The operational condition of one section of membrane separation apparatus 2a is: temperature 60 C, and pressure is 2.5MPa, and membrane area is 240m
2.
The operational condition of two-segment film separator 2c is: temperature 52 DEG C, and pressure is 2.48MPa, and membrane area is 286m
2.
Pressurized air volumetric flow rate is: 500Nm
3/ h
In this embodiment, civilian biological methane output is 6.37 × 10
5nm
3/ a, automobile-used biological methane output is 3.05 × 10
6nm
3/ a, 70 DEG C of hot water output is 9688t/a, 5.0MPa middle pressure steam output is 670t/a, and economic benefit is 5,830,000 yuan/a, and this technique effectively can utilize the biogas of small towns household biogas project surplus.
Claims (3)
1. a Methane Resources diversification utilization technique for environmental protection, is characterized in that,
In pretreatment system (1), biogas removes solid particulate and liquid mist through compressor (1a) supercharging, knot screen (1b), be warming up to the operational condition of membrane module through interchanger (1c), enter film separating system (2);
In film separating system (2), the biogas that pretreatment system (1) exports enters one section of membrane separation apparatus (2a), and per-meate side is the carbonic acid gas containing a small amount of methane, enters catalytic combustion system (3); The low-grade domestic gas of retentate side output, through splitter (2b) shunting, a part exports as product introduction city gas pipe network, and rest part enters two-segment film separator (2c); The product meeting compressed natural gas used as vehicle fuel is produced at two-segment film separator (2c) retentate side, index (GB18047-2000), per-meate side is the carbon dioxide enriched circulation gas that methane content is higher, returns biogas in pretreatment system (1) through compressor (1a) import;
In catalytic combustion system (3), the per-meate side gas of one section of membrane separation apparatus (2a) enters devulcanizer (3a); Gas after desulfurization enters mixing tank (3b) together with air, then enters interchanger (3c) and is warmed up to point of ignition, catalyzed conversion in catalytic combustion reactor (3d); The high-temperature tail gas that reactor (3d) exports, heat of high temperature is reclaimed in interchanger (3f), output 5.0MPa middle pressure steam, the raw material of heatable catalytic combustion reactions in interchanger (3c), temperature is increased to point of ignition, in interchanger (3e), reclaims low-temperature heat quantity, output 70 ~ 90 DEG C of hot water, reclaim low-temperature heat quantity in interchanger (1c) in pretreatment system (1), make biogas temperature reach 40 ~ 80 DEG C.
2. Methane Resources diversification utilization technique according to claim 1, it is characterized in that, the methane content that one section of described membrane separation apparatus (2a) oozes residual air is 80 ~ 90mol%, and it is >=97% that two-segment film separator (2c) oozes residual air methane content.
3. Methane Resources diversification utilization technique according to claim 1 and 2, is characterized in that, after in described catalytic combustion system (3), tail gas carries out harmless treatment, methane content is down to below 100ppm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106281524A (en) * | 2016-08-31 | 2017-01-04 | 胜利油田孚瑞特石油装备有限责任公司 | A kind of recoverying and utilizing method of non-combustible oil field gas |
| CN106430864A (en) * | 2016-12-20 | 2017-02-22 | 大连爱特流体控制有限公司 | Sewage treatment device capable of generating hydrogen |
| CN107998841A (en) * | 2017-12-24 | 2018-05-08 | 杨正山 | A kind of rubbish landfill gas UF membrane couples microalgae carbon sequestration technique |
| CN109593582A (en) * | 2018-12-03 | 2019-04-09 | 中国船舶重工集团公司第七〇九研究所 | Biogas film purifies integrating device and its methane purification method |
| CN113766962A (en) * | 2019-03-08 | 2021-12-07 | 日立造船爱诺瓦公司 | Biogas device and biogas treatment |
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| CN101973523A (en) * | 2010-10-28 | 2011-02-16 | 四川亚联高科技股份有限公司 | Method for preparing hydrogen gas by taking marsh gas as raw material |
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Patent Citations (2)
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| CN101584960A (en) * | 2008-05-22 | 2009-11-25 | 青岛生物能源与过程研究所 | Separator and separation and purification method of gas-liquid phase absorbing membrane |
| CN101973523A (en) * | 2010-10-28 | 2011-02-16 | 四川亚联高科技股份有限公司 | Method for preparing hydrogen gas by taking marsh gas as raw material |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106281524A (en) * | 2016-08-31 | 2017-01-04 | 胜利油田孚瑞特石油装备有限责任公司 | A kind of recoverying and utilizing method of non-combustible oil field gas |
| CN106430864A (en) * | 2016-12-20 | 2017-02-22 | 大连爱特流体控制有限公司 | Sewage treatment device capable of generating hydrogen |
| CN107998841A (en) * | 2017-12-24 | 2018-05-08 | 杨正山 | A kind of rubbish landfill gas UF membrane couples microalgae carbon sequestration technique |
| CN109593582A (en) * | 2018-12-03 | 2019-04-09 | 中国船舶重工集团公司第七〇九研究所 | Biogas film purifies integrating device and its methane purification method |
| CN113766962A (en) * | 2019-03-08 | 2021-12-07 | 日立造船爱诺瓦公司 | Biogas device and biogas treatment |
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