CN101338325A - Process for producing methane by dry-type fermentation of stalks - Google Patents

Process for producing methane by dry-type fermentation of stalks Download PDF

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Publication number
CN101338325A
CN101338325A CNA2008101411778A CN200810141177A CN101338325A CN 101338325 A CN101338325 A CN 101338325A CN A2008101411778 A CNA2008101411778 A CN A2008101411778A CN 200810141177 A CN200810141177 A CN 200810141177A CN 101338325 A CN101338325 A CN 101338325A
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CN
China
Prior art keywords
stalk
biogas
fermentation
technology
stalks
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CNA2008101411778A
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Chinese (zh)
Inventor
何贵忠
何贵新
魏秀生
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河南富城生态能源科技有限公司
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Priority to CNA2008101411778A priority Critical patent/CN101338325A/en
Publication of CN101338325A publication Critical patent/CN101338325A/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
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • 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
    • 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
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/40Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

Abstract

The invention provides a technique for producing biogas by utilizing stalk dry fermentation which includes the steps: I, cracking the stalks into 2 to 8mm by a cracking machine; II, transmitting the cracked stalks into a pre-treatment pool, adding hot water of 40 to 53 DEG C and a stalk fermentation agent in the pre-treatment pool to carry out pre-treatment; the cracked stalks and the biogas slurry refluxed by the anaerobic digester of the pre-treatment pool are mixed according to a proportion of 2 to 1; after stirring, the solid content rate of the stalk liquid is 20 to 35 percent; III, using a mud pump to equally transmit the stalk liquid to the top part of the anaerobic digester with a fermentation temperature of 40 to 53 DEG C; IV, the biogas generated by fermentation is purified to be clean fuel by gas-liquid separation. The technique can lead the stalks of 1.5kg to generate the biogas of 1m<3> (the content of methane is larger or equal to 55 percent); the degrading rate is more than 90 percent. The technique of the invention can continuously feed and discharge; the biogas slurry can be repeatedly used; only biogas slag is discharged; the biogas slag is manufactured into organic fertilizer by processing and can not cause any pollution to the environment.

Description

A kind of technology of utilizing stalk dry type fermentation and biogas production
Technical field:
The present invention relates to a kind of production technique of utilizing stalk fermentation to produce biogas, particularly a kind of technology of utilizing stalk dry type fermentation and biogas production, biogas is the inflammable gas that organism produces through microbiological anaerobic digestion.Its characteristic is similar to natural gas, and biogas also can be made the fuel of oil engine and produce industrial chemicals such as methyl alcohol, formalin, tetracol phenixin except that direct burning is used for cooking, oven dry agricultural byproducts, heating, illumination and gas welding etc.
Background technology:
China's agricultural wastes are varied, but be divided into stalk and bird ight soil two big classes by its source, China's agricultural resource is abundant relatively, calculates by the cereal ratio according to China's staple crops output, annual stalk output is 600,000,000 tons, and straw, maize straw, wheat straw stalk account for 77.2% of stalk total amount.Biogas belongs to renewable energy source, is the biomass energy in the renewable energy source.The production of microbial growth breeding, organic decomposition and inversion, biogas is all carried out in anaeroic digestor, and anaeroic digestor is the nucleus equipment of biogas fermentation, so the structure of anaeroic digestor and running condition are the emphasis of a biogas engineering design.Conventional wet fermentation will consume self energy of about 30%, in north cold area winter even can reach 45%, thereby has limited the popularization of biogas technology at north cold area greatly.Conventional wet is fermented, and not only water loss is big, and brings loaded down with trivial details technology for the oven dry composting of natural pond slag again.Biogas sulphur content height, troublesome poeration, the scientific and technological content that the conventional wet fermentation produces is low, the methane gas producing rate is low.
Traditional biogas fermentation all adopts Wet technique, because Wet technique fermentation power consumption is high, a series of shortcomings such as cost height of processing dry-matter, and the scope and the region of having limited its adaptation.From the nineties, Germany has subsidized the research and development of novel intermittent type dry method biogas fermentation technology in a large number, and at the end of the nineties, German intermittent type dry method biogas technology and equipment have passed through pilot scale, produces the technical grade equipment in 2002 and drops into actual motion.Because continuity dry method marsh gas fermentation process is too complicated, cost is too high, therefore fails to obtain to promote.
Summary of the invention:
The objective of the invention is at above problem, and a kind of technology of utilizing stalk dry type fermentation and biogas production of development, this technology has been broken the barrier that can not use pure stalk fermentation, the scope and the region of stalk marsh gas engineering have been widened, the utilization of agricultural waste material makes increasing peasant income, and reaches the purpose of energy-saving and emission-reduction.
The present invention is achieved in that the step of this technology is:
The first step, earlier with pulverizer with crushed stalk to 2-8mm, be crushed straw aggregate, make crushed straw aggregate and microbial reaction abundant, degradation rate is more than 90%;
Second the step, crushed straw aggregate is delivered to pretreatment pool through transfer roller, and the hot water and the stalk marsh gas starter that add 40-53 ℃ in pretreatment pool carry out pre-treatment, the natural pond liquid that the crushed straw aggregate of pretreatment pool and anaeroic digestor reflux, mixed by 2: 1, stir, stirring back stalk feed liquid solid content is 20-35%;
The 3rd goes on foot, with sludge pump the stalk feed liquid is carried in the anaeroic digestor top equally by transport pipe, makes the natural pond slag be not easy crust, carries out thermophilic fermentation then, and leavening temperature is 40-53 ℃;
The biogas that the 4th step, anaeroic digestor produce through fermentation through the biogas gas-liquid separation device, is delivered to refining plant, is made as clean fuel after the purification.
The present invention can be achieved in that this technology can make 1.5kg stalk output 1M 3Biogas (methane content 〉=55%), degradation rate is more than 90%.
Positively effect of the present invention:
1, initial investment of the present invention, operation cost and Environmental costs are all well below Wet technique, use high temp. dry type fermentation, do the fermentation active substance and account for 20%-35%, self energy consumption is low, have characteristics such as sufficient reacting, organic loading rate height, gas efficiency height, factor of created gase be fast, the pond holds air output 〉=1, and degradation rate is more than 90%, self energy consumption is low, only consumes the 10%-15% of self-energy winter.
But 2, not only continuous dry-type fermentation of the present invention can also continuous dosing and discharging, need not reload greatly, and natural pond liquid is back to pretreatment pool and reuses, and only discharges the natural pond slag, can not pollute; Improve waterpower residence time (HRT), improved contacting of material and microorganism, quickened the decomposition of digestion substrate, organic loading rate and factor of created gase have been improved greatly, factor of created gase 〉=1 does not have moving partss such as agitator in the anaeroic digestor, improved the reliability of system.
3, the present invention not only has very high waste treatment rate, can also obtain the fertilizer product of higher fertilizer efficiency, has simplified earlier stage treatment process, has reduced energy consumption; And stalk dry-type anaerobic fermentation technology because of it can handle the advantage of high solid content refuse, and has satisfied the requirement of present agricultural waste material; In addition, dry anaerobic digestion technology has higher organic loading rate and factor of created gase than wet type technology.
Embodiment:
The present invention is described in further detail below in conjunction with embodiment.
Embodiment one:
With experimental project 200M 3Anaeroic digestor is an example: 300kg stalk day by day, through pre-treatment, continuous dosing is at 43-47 ℃ of following daily gas 200M 3
Processing step of the present invention is:
The first step, earlier with pulverizer with the 300kg/d crushed stalk to 3-6mm, be crushed straw aggregate, make crushed straw aggregate and microbial reaction abundant, degradation rate reaches 90%;
Second the step, crushed straw aggregate is delivered to pretreatment pool through transfer roller, and the hot water and the stalk marsh gas starter that add 43-47 ℃ in pretreatment pool carry out pre-treatment, the natural pond liquid that the crushed straw aggregate of pretreatment pool and anaeroic digestor reflux, mixed by 2: 1, stir, stirring back stalk feed liquid solid content is 23-25%;
The 3rd goes on foot, uses sludge pump that the stalk feed liquid is passed through transport pipe, carries equally in the anaeroic digestor top, makes the natural pond slag be not easy crust, carries out thermophilic fermentation then, and leavening temperature is 43-47 ℃;
The 4th step, anaeroic digestor fermentation produce 200M 3/ d biogas through the biogas gas-liquid separation device, is delivered to refining plant, is made as clean fuel after the purification.
The outside polyurethane heat-insulation that adopts of anaeroic digestor of the present invention, (, factor of created gase being improved greatly) for methanobacteria provides suitable living environment.Residuum natural pond slag contains more comprehensive nutrient element and abundant organic substance, makes organic fertilizer through processing, can not cause any pollution to environment.

Claims (4)

1, a kind of technology of utilizing stalk dry type fermentation and biogas production, it is characterized in that: the step of this technology is:
The first step, earlier with pulverizer with crushed stalk to 2-8mm, be crushed straw aggregate, make crushed straw aggregate and microbial reaction abundant, degradation rate is more than 90%;
Second the step, crushed straw aggregate is delivered to pretreatment pool through transfer roller, and the hot water and the stalk marsh gas starter that add 40-53 ℃ in pretreatment pool carry out pre-treatment, the natural pond liquid that the crushed straw aggregate of pretreatment pool and anaeroic digestor reflux, mixed by 2: 1, stir, stirring back stalk feed liquid solid content is 20-35%;
The 3rd goes on foot, uses sludge pump that the stalk feed liquid is passed through transport pipe, carries equally in the anaeroic digestor top, makes the natural pond slag be not easy crust, carries out thermophilic fermentation then, and leavening temperature is 40-53 ℃;
The biogas that the 4th step, anaeroic digestor produce through fermentation through the biogas gas-liquid separation device, is delivered to refining plant, is made as clean fuel after the purification.
2, a kind of technology of utilizing stalk dry type fermentation and biogas production according to claim 1 is characterized in that: this technology can make 1.5kg stalk output 1M 3Biogas, its methane content 〉=55%, degradation rate is more than 90%.
3, a kind of technology of utilizing stalk dry type fermentation and biogas production according to claim 1 is characterized in that: the hot water and the stalk marsh gas starter that add 43-47 ℃ in the pretreatment pool carry out pre-treatment.
4, a kind of technology of utilizing stalk dry type fermentation and biogas production according to claim 1, it is characterized in that: the leavening temperature of anaeroic digestor is 43-47 ℃.
CNA2008101411778A 2008-08-28 2008-08-28 Process for producing methane by dry-type fermentation of stalks CN101338325A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101973682A (en) * 2010-10-22 2011-02-16 东北农业大学 Wet and dry coupling anaerobic fermentation process method
CN102162000A (en) * 2010-12-10 2011-08-24 刘达苏 Method and device for applying methane to industrial hating furnace
CN102174380A (en) * 2011-03-11 2011-09-07 黑龙江省科学院科技孵化中心 Raw material pretreatment device and system for realizing methane collection by utilizing device
CN102206028A (en) * 2011-03-28 2011-10-05 上海百泉生物技术有限公司 Full-automatic device of producing and purifying biogas and its application
CN101591677B (en) * 2009-07-13 2011-11-09 唐山明仁生物能开发有限公司 Pure straw stackretting-free feeding methane fermentation method
CN101637778B (en) * 2009-08-25 2012-07-04 云南昆船设计研究院 Comprehensive processing technology of organic wastes
CN103045570A (en) * 2013-01-15 2013-04-17 熊鹏 Simple method for replenishing cellulosic raw material reversely
CN104561120A (en) * 2015-02-04 2015-04-29 河南省高新技术实业总公司 Method for preparing biogas through straw three-stage anaerobic fermentation
CN105018344A (en) * 2015-08-04 2015-11-04 常州亚环环保科技有限公司 Biological-chemical circulating biogas fermentation device capable of continuously feeding straws
CN105950446A (en) * 2016-05-13 2016-09-21 安徽金农惠民生物技术有限公司 Device for treating dewatered algae ooze and straw mixture by utilizing high-temperature dry-type anaerobic digestion treatment
CN103226790B (en) * 2013-04-09 2017-10-31 四川大学 Methane gas producing amount querying method and system
CN109136287A (en) * 2018-08-31 2019-01-04 同济大学 The method of macro comminution pretreatment raising stalk wet type anaerobic digestion gas production performance

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101591677B (en) * 2009-07-13 2011-11-09 唐山明仁生物能开发有限公司 Pure straw stackretting-free feeding methane fermentation method
CN101637778B (en) * 2009-08-25 2012-07-04 云南昆船设计研究院 Comprehensive processing technology of organic wastes
CN101973682A (en) * 2010-10-22 2011-02-16 东北农业大学 Wet and dry coupling anaerobic fermentation process method
CN102162000A (en) * 2010-12-10 2011-08-24 刘达苏 Method and device for applying methane to industrial hating furnace
CN102174380A (en) * 2011-03-11 2011-09-07 黑龙江省科学院科技孵化中心 Raw material pretreatment device and system for realizing methane collection by utilizing device
CN102206028B (en) * 2011-03-28 2013-01-02 上海百泉生物技术有限公司 Full-automatic device of producing and purifying biogas and application thereof
CN102206028A (en) * 2011-03-28 2011-10-05 上海百泉生物技术有限公司 Full-automatic device of producing and purifying biogas and its application
CN103045570B (en) * 2013-01-15 2014-06-11 熊鹏 Simple method for replenishing cellulosic raw material reversely
CN103045570A (en) * 2013-01-15 2013-04-17 熊鹏 Simple method for replenishing cellulosic raw material reversely
CN103226790B (en) * 2013-04-09 2017-10-31 四川大学 Methane gas producing amount querying method and system
CN104561120A (en) * 2015-02-04 2015-04-29 河南省高新技术实业总公司 Method for preparing biogas through straw three-stage anaerobic fermentation
CN105018344A (en) * 2015-08-04 2015-11-04 常州亚环环保科技有限公司 Biological-chemical circulating biogas fermentation device capable of continuously feeding straws
CN105950446A (en) * 2016-05-13 2016-09-21 安徽金农惠民生物技术有限公司 Device for treating dewatered algae ooze and straw mixture by utilizing high-temperature dry-type anaerobic digestion treatment
CN109136287A (en) * 2018-08-31 2019-01-04 同济大学 The method of macro comminution pretreatment raising stalk wet type anaerobic digestion gas production performance

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