CN1274648C - Production and apparatus for producing methane from refuse embedded gas - Google Patents
Production and apparatus for producing methane from refuse embedded gas Download PDFInfo
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- CN1274648C CN1274648C CN 200510004873 CN200510004873A CN1274648C CN 1274648 C CN1274648 C CN 1274648C CN 200510004873 CN200510004873 CN 200510004873 CN 200510004873 A CN200510004873 A CN 200510004873A CN 1274648 C CN1274648 C CN 1274648C
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 84
- 238000001179 sorption measurement Methods 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000010521 absorption reaction Methods 0.000 claims abstract description 21
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 8
- 238000007906 compression Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 238000005516 engineering process Methods 0.000 claims abstract description 6
- 230000009466 transformation Effects 0.000 claims description 14
- 238000011068 loading method Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 230000008929 regeneration Effects 0.000 claims description 5
- 238000011069 regeneration method Methods 0.000 claims description 5
- 229910021536 Zeolite Inorganic materials 0.000 claims description 4
- 230000000274 adsorptive effect Effects 0.000 claims description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 239000010457 zeolite Substances 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 239000003463 adsorbent Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 238000007710 freezing Methods 0.000 claims description 2
- 230000008014 freezing Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000002808 molecular sieve Substances 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 230000007420 reactivation Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 2
- 238000004148 unit process Methods 0.000 claims description 2
- 239000003345 natural gas Substances 0.000 abstract description 3
- 238000004108 freeze drying Methods 0.000 abstract 2
- 230000001172 regenerating effect Effects 0.000 abstract 2
- 239000013064 chemical raw material Substances 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005194 fractionation Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
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Abstract
The present invention relates to a method and a device for preparing methane from garbage landfill gas, which belongs to the field of garbage treatment and regenerative energy sources. The method of the present invention comprises: extracted garbage landfill gas is treated with pretreatment technologies, such as compression, freeze drying, multi-stage filtration and adsorption drying; then the garbage landfill gas is treated with circular production technologies, such as high-pressure absorption, parallel-flow pressure equalizing and normal-pressure regenerative pressure swing adsorption. The device of the present invention comprises a compressing machine, a freeze drying machine, a filtering machine and a drying tower which are orderly connected with each other, and the device also comprises a pressure swing adsorption circulating system composed of 2 to 6 adsorption columns which are connected in parallel with each other. The present invention has the advantages of simple device, convenient technological operation, little investment, small occupation area and good flexibility. Besides garbage landfill gas, various kinds of methane can be used as raw material gas. After being compressed, the product gas can be directly used as vehicle compressed natural gas (CNG). When technological parameters are changed, the product gas can be used for preparing urban gas, chemical raw material gas, etc.
Description
Technical field
The invention belongs to refuse treatment and renewable energy source domain, characteristics relate to the resource utilization method of biogas like garbage loading embeading gas and other the various constituent classes.
Technical background
(Landfill Gas LFG) contains 40～70% CH respectively to landfill gas
4With 30～50% CO
2, its calorific value is about 4500～5500kcal/Nm
3, promptly the energy of every cubic metre of LFG burning generation is about as much as 0.45 liter of diesel oil or 0.6 liter of gasoline, and therefore, it is the higher clean fuel of a kind of utility value.2,200～3,6,000,000 tons of CH from refuse landfill are arranged global every year approximately
4Enter atmosphere, wasted a large amount of renewable energy sources in the time of contaminate environment.With China is example, Chinese city refuse collection amount reached 1.3 hundred million tons in 2000, nearly 20 years statistic data shows the speed increase of Chinese city refuse production with every year 8～10%, and present main processing mode still is sanitary landfill, can infer that in view of the above the generation of Chinese LFG increases day by day.It is predicted, will reach 6,600,000,000 m to the methane generation of Municipal Solid Waste Landfills in China in 2010
3, calculate by utilization ratio 30%, be equivalent to save 2,400,000 t standard coals, amount to into amount of natural gas and be about 22.3 hundred million m
3Therefore, LFG is one of biomass energy of development and use.
Four kinds of main ingredients of landfill gas are CH
4, CO
2, N
2And O
2CH at present purifies from garbage loading embeading gas
4Three kinds of methods can be arranged: absorption extraction, fractionation by adsorption and membrane sepn.Because CO
2Be slightly acidic gas, the employing basic solution is that the absorption extraction of absorption agent can be removed the most of CO in the landfill gas
2But, N
2And O
2Solubleness in solution is then very little, and separating effect is not obvious.Membrane sepn is to utilize film that the different permeability of carbonic acid gas, methane is realized CO
2/ CH
4Separate, but the membrane sepn process need under the high pressure of 1.7～5.5Mpa, finish, the Technological Economy cost is higher.Fractionation by adsorption adopts alternating temperature absorption, and alternating temperature absorption needs heating, and energy consumption is bigger, and it is longer to finish a round-robin cycle, generally is used for small-scale industrial production.
Summary of the invention
The objective of the invention is to enter atmosphere for solving landfill gas, wasted the problem of a large amount of energy in the time of contaminate environment, the novel method that a kind of LFG of utilization produces methane is proposed, by LFG is separated, purifying technique is produced methane, make LFG become renewable and clean energy resource, and have simple, characteristics of high efficiency.
A kind of method of utilizing garbage loading embeading gas to produce methane that the present invention proposes comprises pretreatment technology and transformation sorption cycle production technique;
This pretreatment technology may further comprise the steps:
1) the garbage loading embeading gas that extracts is compressed, compression back gaseous tension is 0.08～0.2MPa;
2) will compress back gas and carry out lyophilize and remove portion water steam, freezing temp-10～-25 ℃;
3) gas behind the compression condensation is filtered filtering particulate matter and H wherein
2Various foreign gases such as S;
4) the gas reusing activated alumina after the filtration carries out adsorption dry removal surplus water steam;
Described transformation sorption cycle production technique specifically may further comprise the steps:
5) high pressure absorption will the gas after adsorption dry feeds first absorbing unit and carries out high pressure absorption, and adsorptive pressure is 0.3～0.6Mpa, and adsorption time is 30～120s, obtains the enrich methane product gas, collects from this first absorbing unit outlet valve;
6) co-current and pressure equalization is finished first absorbing unit of high pressure absorption and is closed outlet valve, is communicated with thereafter second absorbing unit again, makes two absorbing unit pressure identical;
7) after normal pressure regeneration, first absorbing unit were finished and all pressed, its outlet valve was opened with atmosphere and is communicated the discharge of the residual gas in it, and introduced product gas from import and carry out blowback, and the blowback flow is 0.8～2.0Nm
3/ h makes the adsorbent reactivation of this absorbing unit;
8) second absorbing unit process of carrying out step 5-7 is successively finished high pressure absorption, co-current and pressure equalization and regeneration, and each absorbing unit carries out the process of step 5-7 successively by that analogy; This adsorption system is finished a transformation sorption cycle.
The present invention also proposes to realize the equipment of aforesaid method, comprises pretreatment unit and coupled productive unit; This pretreatment unit comprises compressor, cooling driers, filter and the drying tower that connects successively; To remove granule foreign, moisture, the H among the LFG
2S gas and other foreign gas, and make gas flow, the pressure-stabilisation that enters productive unit; This productive unit adopts 2～6 adsorption columns formation in parallel transformation sorption cycle system, to realize separation, the purification of methane.
Characteristics of the present invention and effect:
Described pretreatment unit is for removing granule foreign, moisture, the H among the LFG
2S gas and other foreign gas; and make the gas flow that enters productive unit and pressure-stabilisation at certain level; to guarantee follow-up transformation absorption (Pressure SwingAdsorption; PSA) the normal steady running of productive unit (wherein; the alumina adsorption drying is a committed step; the gas that it has guaranteed to enter pressure-swing absorber is exsiccant, when the agent of protection adsorption tower internal adsorption is not damaged, has guaranteed that also product gas reaches in the relevant vehicle CNG standard of country the requirement to water dew point.)；
The adsorption tower of described productive unit can select to fill 3A, 4A, 5A and 13X zeolite and various length carbonaceous molecular sieve; The transformation adsorption time is 30～120s, and adsorptive pressure is 0.3～0.6Mpa; The product gas blowback adsorption tower that utilization is discharged from pressure swing adsorption system, the blowback flow is 0.8～2.0Nm
3/ h; System's gas production rate is 4～10m
3/ h (pressure 0.3MPa).
Pretreatment unit of the present invention is removed granule foreign, moisture, H among the LFG by means such as compression condensation, cascade filtration and alumina adsorption dryings
2S gas and other foreign gas, and make the gas of the system of entering reach stable flow rate and pressure.Productive unit is finished separating of main component methane and carbonic acid gas among the LFG by transformation absorption, the methane product gas of purity more than 96% is provided, and reaches the methane recovery more than 55%.
Present device is simple, easy and simple to handle, reduced investment, occupation of land are few, and has good handiness.It is external that unstripped gas removes refuse embedded gas, can also be various biogas; Product gas is compressed can be directly as compressed natural gas used as vehicle fuel (CNG), but changes also production city combustion gas of processing parameter, material gas etc.
Description of drawings
Fig. 1 is the integrated artistic schema of the inventive method.
Embodiment
Further specify detailed process of the present invention below in conjunction with drawings and Examples.
Method and apparatus embodiment of the present invention as shown in Figure 1, wherein solid line is represented unstripped gas, dotted line representative products gas, dotted line is represented tail gas, the equipment of present embodiment system for use in carrying constitutes and comprises:
200m
3The off-gas pump import of/h links to each other with the refuse landfill gas gathering system, and outlet is by valve and useful volume 25m
3Gas-holder 2 link to each other, gas-holder 2 outlets link to each other with compressor 3 by valve, compressor 3 power are 500kW, unstripped gas can be compressed to 1MPa, and compressor 3 directly links to each other with cooling driers 4, cooling driers 4 directly links to each other with strainer 5, fill filtrate natural quartz sand in the strainer, filter outlet links to each other with drying tower 6 by under meter, thermometer successively, fills activated alumina in the drying tower 6, drying tower 6 outlets link to each other with adsorption tower 7, and adsorption tower 7 has tail gas outlet and product gas outlet.
The above-mentioned gas-holder 2 of present embodiment, compressor 3, cooling driers 4, strainer 5 directly link to each other, and strainer, all adopt the construction equipment that routinizes with drying tower 6, fill activated alumina in the drying tower; Adsorption tower 7 also belongs to conventional equipment, and the adsorption tower 7 of present embodiment composes in parallel pressure swing adsorption system adsorption column internal diameter 0.30m by two adsorption column A, B, adsorption column internal adsorption agent loading height 0.66m.
The method that adopts present embodiment equipment to produce methane from garbage loading embeading gas may further comprise the steps:
1) off-gas pump 1 is extracted unstripped gas out and is sent into gas-holder 2 bufferings after compressor 3 compresses from the extraction well of refuse landfill, and compression back gaseous tension is 0.08～0.2MPa;
2) gas after the compression is sent into cooling driers 4 lyophilizes and is removed portion water steam, and cooling temperature is-10～-25 ℃ and preferably selects about-15 ℃;
3) gas after the lyophilize is sent into strainer 5 filterings particulate matter and H wherein
2Various foreign gases such as S are filtered impurity granularity＜5 μ m in the gas of back, foreign matter content≤0.03g/Nm
3, H
2S content≤20mg/Nm
3
4) entering drying tower 6 again utilizes the activated alumina in the tower to remove surplus water steam, gas relative humidity＜35% (under the 0.2MPa condition);
5) after pretreated gas enters the adsorption tower 7 that is made of 2 adsorption columns, filling 4A zeolite, at first be high pressure absorption, unstripped gas enters adsorption column A, is forced into more than the 0.3Mpa transformation adsorption time 30s (time that comprises the process of boosting);
6) after adsorption column A high pressure absorption finished, adsorption column A was communicated with adsorption column B and carries out co-current and pressure equalization (pressure of present embodiment adsorption column A is reduced to about 0.15MPa, and the pressure of adsorption column B rises to about 0.15MPa from normal pressure, co-current and pressure equalization time 5s);
7) after co-current and pressure equalization was finished, the outlet valve of adsorption column A communicated with atmosphere, got rid of residual gas in the post, introduced product gas and purged that (present embodiment product gas blowback flow is 0.8Nm
3/ h), finish the normal pressure regeneration of the sorbent material of adsorption column A;
8) at adsorption column A normal pressure regenerated simultaneously, adsorption column B carries out high pressure absorption, and this process is identical with the high pressure absorption of adsorption column A; After adsorption column B finished high pressure absorption, co-current and pressure equalization was carried out in adsorption column A, B connection, finishes a transformation sorption cycle of adsorption tower 7.The gas production rate 4m of system
3/ h.
In another embodiment, system device constitutes same as the previously described embodiments, and adsorption tower 7 composes in parallel pressure swing adsorption system by 4 adsorption columns, fills the 13X zeolite in the adsorption column.Step 2) the cooling driers temperature is-20 ℃, step 5) transformation adsorption time 105s, adsorptive pressure 0.6MPa, product gas blowback flow 2.0Nm
3/ h, the gas production rate 10m of system
3/ h.
Claims (3)
1. a method of producing methane from garbage loading embeading gas is characterized in that, comprises pretreatment technology and transformation sorption cycle production technique;
This pretreatment technology may further comprise the steps:
1) the garbage loading embeading gas that extracts is compressed, compression back gaseous tension is 0.08～0.2MPa;
2) will compress back gas and carry out lyophilize and remove portion water steam, freezing temp-10～-25 ℃;
3) gas behind the compression condensation is filtered filtering particulate matter and H wherein
2Various foreign gases such as S;
4) the gas reusing activated alumina after the filtration carries out adsorption dry removal surplus water steam;
Described transformation sorption cycle production technique specifically may further comprise the steps:
5) high pressure absorption will the gas after adsorption dry feeds first absorbing unit and carries out high pressure absorption, and adsorptive pressure is 0.3～0.6Mpa, and adsorption time is 30～120s, obtains the enrich methane product gas, collects from this first absorbing unit outlet valve;
6) co-current and pressure equalization is finished first absorbing unit of high pressure absorption and is closed outlet valve, is communicated with thereafter second absorbing unit again, makes two absorbing unit pressure identical;
7) after normal pressure regeneration, first absorbing unit were finished and all pressed, its outlet valve was opened with atmosphere and is communicated the discharge of the residual gas in it, and introduced product gas from import and carry out blowback, and the blowback flow is 0.8～2.0Nm
3/ h makes the adsorbent reactivation of this absorbing unit;
8) second absorbing unit process of carrying out step 5-7 is successively finished high pressure absorption, co-current and pressure equalization and regeneration, and each absorbing unit carries out the process of step 5-7 successively by that analogy; This adsorption system is finished a transformation sorption cycle.
2. an equipment of producing methane from garbage loading embeading gas is characterized in that: comprise pretreatment unit and coupled productive unit; This pretreatment unit comprises compressor, cooling driers, filter and the drying tower that connects successively; To remove granule foreign, moisture, the H in the landfill gas
2S gas and other foreign gas, and make gas flow, the pressure-stabilisation that enters productive unit; This productive unit adopts 2～6 adsorption columns formation in parallel transformation sorption cycle system, to realize separation, the purification of methane.
3. according to the described equipment of claim 2, it is characterized in that: the weighting material in the described pressure-swing absorber is selected one or more of 3A, 4A, 5A, 13X zeolite and length carbonaceous molecular sieve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510004873 CN1274648C (en) | 2005-02-03 | 2005-02-03 | Production and apparatus for producing methane from refuse embedded gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510004873 CN1274648C (en) | 2005-02-03 | 2005-02-03 | Production and apparatus for producing methane from refuse embedded gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1680222A CN1680222A (en) | 2005-10-12 |
| CN1274648C true CN1274648C (en) | 2006-09-13 |
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ID=35067107
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|---|---|---|---|
| CN 200510004873 Expired - Fee Related CN1274648C (en) | 2005-02-03 | 2005-02-03 | Production and apparatus for producing methane from refuse embedded gas |
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| CN (1) | CN1274648C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353207A (en) * | 2013-07-18 | 2013-10-16 | 杭州凯德空分设备有限公司 | Device for purifying methane liquid from purified landfill gas |
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| CN101544920B (en) * | 2009-05-07 | 2012-09-19 | 北京溯希至清科技有限公司 | Process for preparing compressed natural gas by deodorizing and purifying landfill gas |
| CN101817715B (en) * | 2009-08-06 | 2013-06-26 | 四川亚连科技有限责任公司 | Method for extracting methane gas from marsh gas |
| CN102154046B (en) * | 2011-03-07 | 2013-07-17 | 罗东晓 | Method for processing and utilizing methane in refuse landfill |
| CN102380286B (en) * | 2011-11-28 | 2014-05-07 | 广西大学 | Method for separating and purifying marsh gas and carbon dioxide through variable frequency and variable pressure adsorption |
| CN102585953A (en) * | 2012-03-09 | 2012-07-18 | 广西大学 | Efficient variable-frequency and variable-pressure adsorptive separation and purification method for methane and carbon dioxide |
| CN103508829A (en) * | 2012-06-25 | 2014-01-15 | 张文波 | Method for purifying methane from biogas |
| CN103055532B (en) * | 2012-12-06 | 2015-08-12 | 江苏三木集团有限公司 | Polyalcohol acrylate reclaims the device of cyclohexane in producing |
| CN102989257A (en) * | 2012-12-11 | 2013-03-27 | 雷学军 | Comprehensive utilization device and method of biomass landfill gas |
| CN103056145B (en) * | 2012-12-24 | 2015-03-18 | 北京时代桃源环境科技有限公司 | Kitchen waste processing method |
| CN106590788A (en) * | 2016-12-30 | 2017-04-26 | 北京健坤伟华新能源科技有限公司 | Ultralow-pressure swing adsorption biogas purifying device |
| KR101900031B1 (en) * | 2018-03-28 | 2018-09-18 | 에코바이오홀딩스 주식회사 | Pre-treament method for biogas purifying |
| CN111440645B (en) * | 2020-04-20 | 2021-05-14 | 广东石油化工学院 | Biogas purification method and device based on vacuum freezing technology |
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2005
- 2005-02-03 CN CN 200510004873 patent/CN1274648C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353207A (en) * | 2013-07-18 | 2013-10-16 | 杭州凯德空分设备有限公司 | Device for purifying methane liquid from purified landfill gas |
| CN103353207B (en) * | 2013-07-18 | 2015-02-25 | 杭州凯德空分设备有限公司 | Device for purifying methane liquid from purified landfill gas |
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| CN1680222A (en) | 2005-10-12 |
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