CN102191278A - Technology of producing biogas with biomass straw through anaerobic fermentation - Google Patents

Technology of producing biogas with biomass straw through anaerobic fermentation Download PDF

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Publication number
CN102191278A
CN102191278A CN2011100892236A CN201110089223A CN102191278A CN 102191278 A CN102191278 A CN 102191278A CN 2011100892236 A CN2011100892236 A CN 2011100892236A CN 201110089223 A CN201110089223 A CN 201110089223A CN 102191278 A CN102191278 A CN 102191278A
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China
Prior art keywords
stalk
biogas
technology
biomass straw
pretreatment pool
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CN2011100892236A
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Chinese (zh)
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高立洪
韦秀丽
李萍
蒋祖勤
孙俊环
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Chongqing Academy of Agricultural Sciences
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Chongqing Academy of Agricultural Sciences
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Priority to CN2011100892236A priority Critical patent/CN102191278A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

The invention discloses a technology of producing biogas with biomass straws through anaerobic fermentation. The steps of the technology are: (1) using a chopping and rubbing machine to process the biomass straws into soft filament strips with a length of 1.5 to 2.5 cm; (2) transmitting the straws of soft filament strips into a pretreatment pool through a conveyer, adding the biogas slurry back flowed from an anaerobic reactor into the pretreatment pool, fully stirring, the total solid concentration of the straw material liquid after stirring being 20 percent and retting the straw material liquid in the pretreatment pool for 5 to 7 days; (3) transferring the straw material liquid into the anaerobic reactor installed with a shell-breaking device for fermentation at a temperature of 30 to 40 DEG C to produce biogas.

Description

The biomass straw anaerobically fermenting is produced the technology of biogas
Technical field
The present invention relates to a kind of biogas production technology, particularly a kind of technology of utilizing the biomass straw anaerobically fermenting to produce biogas.
Background technology
China will produce about 700,000,000 tons biomass straw every year, comprise straw, maize straw, wheat straw stalk etc., and wherein major part is utilized, and has both caused the wasting of resources, again contaminate environment.It is a kind of effective straw utilization approach that stalk anaerobic fermentation is produced biogas, but stalk but exists fermentation starting time long, factor of created gase is low, raw material availability is low, raw material easily crusts the carrying out of influence fermentation and the problems such as turnover of raw material as main fermentation raw material.This mainly is because the content of xylogen, Mierocrystalline cellulose and the hemicellulose of stalk is higher, and these macromole are entangled to each other, are difficult for degraded, make methanogen be difficult to obtain required small organic molecule, cause fermentation efficiency low, and the cycle is longer.Studies show that the stalk pre-treatment is remarkable to the fermenting process influence, therefore adopting economic and practical pre-treatment is the key of High-efficient Production biogas.
The biomass straw pretreatment mode mainly contains physics, chemistry and carries out a biological disposal upon three kinds, and wherein physical treatment generally is again the prerequisite of chemistry and biological treatment.By prescind, physical treatment such as pulverizing, change the physical aspect of biomass straw, increase surface-area, from and improve the factor of created gase of biomass straw anaerobically fermenting.
At present, the physical treatment of biomass straw is generally adopted and is prescinded, grinding mode, but all exists some problems.Prescind processing merely, general cutting machine power consumption is lower, energy consumption is comparatively reasonable, but the stalk particle diameter is generally about 3-5 cm, and particle diameter is bigger, the stalk dense structure is survivable, organic solid degradation rates such as xylogen, Mierocrystalline cellulose and hemicellulose are not high, when anaerobically fermenting is produced biogas start time long, easy floating crust in reactor, factor of created gase is low, and raw material availability is low.Adopt pulverization process, the stalk particle diameter all can be less than 1cm, the organic solid degradation rate is improved, be difficult for crust, improved factor of created gase, but the less power consumption of pulverizing of pulverizer that causes of particle diameter is generally all bigger, energy consumption is higher, economy is relatively poor, thereby has limited large-scale developing and utilizing of biomass straw.
Existing stalk fermentation all need add the microbial fermentation bacterium in stalk, after fermentation was finished, natural pond liquid and natural pond slag directly discharged or be used to make fertilizer, and natural pond liquid can not make full use of.
Summary of the invention
Purpose of the present invention just is to provide a kind of biomass straw anaerobically fermenting to produce the technology of biogas, and this technology has been accelerated the degradation rate of organic solid, has shortened the start time of anaerobically fermenting, and energy consumption is lower, and natural pond liquid is fully utilized.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of biomass straw anaerobically fermenting is produced the technology of biogas, and the step of this technology is:
(1) with the chopping kneading machine biomass straw is processed into the soft strand that length is 1.5-2.5cm;
(2) stalk of strand shape is delivered to pretreatment pool through transfer roller, and add the natural pond liquid that refluxes from anaerobic reactor in pretreatment pool, fully stir, the total solid concentration that stirs back stalk feed liquid is 20%, then with stalk feed liquid in pretreatment pool stack retting 5-7 days;
(3) the stalk feed liquid is moved in the anaerobic reactor that hulling machine is housed ferment, the biogas of generation, the temperature of fermentation is 30-40 ℃.
Chopping is rubbed with existing and is prescinded processing mode and compare in the technique scheme, and particle diameter is less, makes originally that thick and stiff stalk material becomes tiny softish strand shape, has destroyed xylogen and cellulosic dense structure, reduces cellulosic degree of crystallinity; And the strand shape can further increase the specific surface area of stalk material, thereby has increased stalk organic solid and zymogenic contact area, accelerates the degradation rate of organic solid, is difficult for crust, shortens the start time of anaerobically fermenting, improves the raw material factor of created gase.Compare with existing pulverizing pretreatment mode and since chopping when rubbing the stalk particle diameter generally at 1.5-2.5 cm, littler than the particle diameter of pulverization process, reduced energy consumption, cost performance is higher, helps large-scale developing and utilizing of biomass straw.
Natural pond liquid plays the effect of inoculum in the technique scheme, for stalk fermentation provides microbial pretreatment; The present invention makes full use of the natural pond liquid that the fermentation back produces, and is free from environmental pollution.Broken shell sedimentation device in the anaerobic reactor stirs strand shape stalk and presses down, and solves the floating easy incrustive problem of stalk.
As preferred implementation of the present invention: in the step (1), biomass straw is processed into the soft strand that length is 2cm with the chopping kneading machine.
Compared with prior art, the invention has the advantages that: the present invention adopts the chopping mode of rubbing to handle biomass straw, stalk becomes the strand shape, greatly destroyed the dense structure of stalk complexity, increase specific surface area, thereby organic solid and zymogenic contact area have been increased, degradation rate improves 30%, reduced the difficulty of follow-up other chemistry or biological treatment, shortened anaerobically fermenting start time, the stalk material is difficult for floating crust, and the raw material factor of created gase improves more than 20%, has greatly improved the utilization ratio of biomass straw; Chopping is simultaneously rubbed the stalk particle diameter at 1.5-2.5 cm, and is littler than the particle diameter of pulverization process, so energy consumption reduced more than 20%, helps large-scale developing and utilizing of biomass straw, has higher promotion and application and is worth.
Embodiment
Embodiment 1
Collect stalk 300kg, biomass straw is processed into the soft strand that length is 2cm with the chopping kneading machine; The stalk of strand shape is delivered to pretreatment pool through transfer roller, and in pretreatment pool, add from the natural pond liquid of anaerobic reactor backflow, fully stir, the total solid concentration that stirs back stalk feed liquid is 20%, with stalk feed liquid stack retting 5 days in pretreatment pool, can shorten the residence time of material in anaerobic reactor so then; With pump the stalk feed liquid being moved into the top by transport pipe is equipped with in the anaerobic reactor of hulling machine and ferments, produce biogas, the temperature of fermentation is 40 ℃, and the biogas of generation is through the biogas gas-liquid separation device, be delivered to refining plant, make clean fuel after the purification; After 23 days, anaerobic reaction is finished, and does not promptly have biogas to produce, and after solid-liquid separation, natural pond liquid is back in the pretreatment pool by pipeline strand shape stalk is carried out pre-treatment with the natural pond liquid in the reactor and natural pond slag, and the natural pond slag is used to make fertilizer.
Embodiment 2
Collect stalk 300kg, biomass straw is processed into the soft strand that length is 1.5cm with the chopping kneading machine; The stalk of strand shape is delivered to pretreatment pool through transfer roller, and in pretreatment pool, add from the natural pond liquid of anaerobic reactor backflow, fully stir, the total solid concentration that stirs back stalk feed liquid is 20%, with stalk feed liquid stack retting 7 days in pretreatment pool, can shorten the residence time of material in anaerobic reactor so then; With pump the stalk feed liquid being moved into the top by transport pipe is equipped with in the anaerobic reactor of hulling machine and ferments, produce biogas, the temperature of fermentation is 30 ℃, and the biogas of generation is through the biogas gas-liquid separation device, be delivered to refining plant, make clean fuel after the purification; After 20 days; Anaerobic reaction is finished, and does not promptly have biogas to produce, and after solid-liquid separation, natural pond liquid is back in the pretreatment pool by pipeline strand shape stalk is carried out pre-treatment with the natural pond liquid in the reactor and natural pond slag, and the natural pond slag is used to make fertilizer.
Embodiment 3
Collect stalk 300kg, biomass straw is processed into the soft strand that length is 2.5cm with the chopping kneading machine; The stalk of strand shape is delivered to pretreatment pool through transfer roller, and in pretreatment pool, add from the natural pond liquid of anaerobic reactor backflow, fully stir, the total solid concentration that stirs back stalk feed liquid is 20%, with stalk feed liquid stack retting 6 days in pretreatment pool, can shorten the residence time of material in anaerobic reactor so then; With pump the stalk feed liquid being moved into the top by transport pipe is equipped with in the anaerobic reactor of hulling machine and ferments, produce biogas, the temperature of fermentation is 35 ℃, and the biogas of generation is through the biogas gas-liquid separation device, be delivered to refining plant, make clean fuel after the purification; After 25 days, anaerobic reaction is finished, and does not promptly have biogas to produce, and after solid-liquid separation, natural pond liquid is back in the pretreatment pool by pipeline strand shape stalk is carried out pre-treatment with the natural pond liquid in the reactor and natural pond slag, and the natural pond slag is used to make fertilizer.

Claims (2)

1. a biomass straw anaerobically fermenting is produced the technology of biogas, and it is characterized in that: the step of this technology is:
(1) with the chopping kneading machine biomass straw is processed into the soft strand that length is 1.5-2.5cm;
(2) stalk of strand shape is delivered to pretreatment pool through transfer roller, and add the natural pond liquid that refluxes from anaerobic reactor in pretreatment pool, fully stir, the total solid concentration that stirs back stalk feed liquid is 20%, then with stalk feed liquid in pretreatment pool stack retting 5-7 days;
(3) the stalk feed liquid is moved in the anaerobic reactor that hulling machine is housed ferment, produce biogas, the temperature of fermentation is 30-40 ℃, and fermentation time is 20-25 days.
2. biomass straw anaerobically fermenting according to claim 1 is produced the technology of biogas, it is characterized in that: in the step (1), with the chopping kneading machine biomass straw is processed into the soft strand that length is 2cm.
CN2011100892236A 2011-04-11 2011-04-11 Technology of producing biogas with biomass straw through anaerobic fermentation Pending CN102191278A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102732323A (en) * 2012-07-06 2012-10-17 苗晓 Plant-straw solar gasification and waste-slag and waste-water collection and utilization device
CN105063097A (en) * 2015-09-21 2015-11-18 七台河宝泰隆煤化工股份有限公司 Method for preparing CNG (compressed natural gas) from straws
CN105132058A (en) * 2015-09-21 2015-12-09 七台河宝泰隆煤化工股份有限公司 Method for preparing CNG through biomass
CN105603001A (en) * 2016-02-05 2016-05-25 新疆农业科学院生物质能源研究所 Aerobic-anaerobic coupled semicontinuous feeding methane fermentation method capable of recycling methane liquid
CN107164414A (en) * 2017-06-26 2017-09-15 南京农业大学 A kind of method that degrading straw class raw material anaerobic fermentation produces biogas
CN110079559A (en) * 2019-04-24 2019-08-02 杭州能源环境工程有限公司 A kind of dry yellow stalk pretreatment technique for anaerobic fermentation
CN111172198A (en) * 2019-12-30 2020-05-19 哈尔滨工业大学 Biogas slurry pretreatment method for lignocellulose biomass and method for producing biogas by using biogas slurry pretreatment method
CN111690693A (en) * 2020-08-07 2020-09-22 东营市延旭环保科技有限公司 Environment-friendly biogas power generation biogas production process

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CN101519668A (en) * 2009-04-03 2009-09-02 南京大学 Method for preparing marsh gas by fermenting steam-exploded wood fiber straws
CN101818173A (en) * 2010-03-23 2010-09-01 河南农业大学 Process for producing biogas from crop straw by dry fermentation
CN101828631A (en) * 2009-05-14 2010-09-15 广东海洋大学 Banana planting by-product fermented feed and processing method thereof

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CN1388249A (en) * 2002-06-12 2003-01-01 冼嘉惠 Mixed fermenting marsh gas material and its production process
CN101519668A (en) * 2009-04-03 2009-09-02 南京大学 Method for preparing marsh gas by fermenting steam-exploded wood fiber straws
CN101828631A (en) * 2009-05-14 2010-09-15 广东海洋大学 Banana planting by-product fermented feed and processing method thereof
CN101818173A (en) * 2010-03-23 2010-09-01 河南农业大学 Process for producing biogas from crop straw by dry fermentation

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102732323A (en) * 2012-07-06 2012-10-17 苗晓 Plant-straw solar gasification and waste-slag and waste-water collection and utilization device
CN102732323B (en) * 2012-07-06 2014-08-27 苗晓 Plant-straw solar gasification and waste-slag and waste-water collection and utilization device
CN105063097A (en) * 2015-09-21 2015-11-18 七台河宝泰隆煤化工股份有限公司 Method for preparing CNG (compressed natural gas) from straws
CN105132058A (en) * 2015-09-21 2015-12-09 七台河宝泰隆煤化工股份有限公司 Method for preparing CNG through biomass
CN105603001A (en) * 2016-02-05 2016-05-25 新疆农业科学院生物质能源研究所 Aerobic-anaerobic coupled semicontinuous feeding methane fermentation method capable of recycling methane liquid
CN105603001B (en) * 2016-02-05 2019-10-25 新疆农业科学院生物质能源研究所 A kind of aerobic anaerobism of biogas slurry reuse couples semicontinuous feed supplement biogas fermentation method
CN107164414A (en) * 2017-06-26 2017-09-15 南京农业大学 A kind of method that degrading straw class raw material anaerobic fermentation produces biogas
CN110079559A (en) * 2019-04-24 2019-08-02 杭州能源环境工程有限公司 A kind of dry yellow stalk pretreatment technique for anaerobic fermentation
CN111172198A (en) * 2019-12-30 2020-05-19 哈尔滨工业大学 Biogas slurry pretreatment method for lignocellulose biomass and method for producing biogas by using biogas slurry pretreatment method
CN111690693A (en) * 2020-08-07 2020-09-22 东营市延旭环保科技有限公司 Environment-friendly biogas power generation biogas production process

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Application publication date: 20110921

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