CN101519668A - Method for preparing marsh gas by fermenting steam-exploded wood fiber straws - Google Patents
Method for preparing marsh gas by fermenting steam-exploded wood fiber straws Download PDFInfo
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- CN101519668A CN101519668A CN200910029203A CN200910029203A CN101519668A CN 101519668 A CN101519668 A CN 101519668A CN 200910029203 A CN200910029203 A CN 200910029203A CN 200910029203 A CN200910029203 A CN 200910029203A CN 101519668 A CN101519668 A CN 101519668A
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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
Abstract
The invention discloses a method for preparing marsh gas by fermenting steam-explosion wood fiber straws, which comprises the following steps: cutting up the straws first and filling the same into an steam-explosion device to perform steam explosion so as to obtain powdered and threadlike steam-explosion straw materials, and putting the steam-explosion straw materials into an anaerobic biogas reactor to perform anaerobic fermentation so as to generate biogases. The content of methane in the biogas prepared by the method is higher with 65 to 75 percent. The method has multiple functions of improving the problem of the structural inhibition of the anaerobic fermentation of the wood fiber straws, obtaining clean energy source, and treats the wood fiber straw wastes in countryside simultaneously.
Description
Technical field
The invention belongs to biogas energy preparation method field, be specifically related to the technology that a kind of lignocellulose stalk anaerobic fermentation produces biogas.
Background technology
Energy and environment are the most important themes in contemporary mankind society and the countries in the world Sustainable development process.The human main energy sources of using from the bavin firewood to coal, oil and natural gas, new forms of energy till now comprise nuclear energy again, sun power, wind energy and bioenergy etc.But current usage quantity is maximum, and the still fossil oil of proportion maximum because a large amount of use fossil oils has produced a large amount of objectionable impuritiess, pollutes and ecological damage thereby produced serious environmental; Simultaneously, because a large amount of exploitations and the world economy develop rapidly and the population sharp increase of fossil energy, the energy consumption index increases substantially, and has caused the deficient day by day of fossil energy.Therefore research and development of new sources of energy is when last megatrend and extremely urgent task.
The organic solid castoff that the rural area produced mainly is the stalk of lignocellulose, as: hydrobiont (Herba Eichhorniae, water peanut etc.), straw, grass etc.Wherein most of the burning or air storage so not only wasted resource, and burning process can be caused topsoil; Air storage can be grown mosquitos and flies in summer, increases the probability of pathophoresis, and the harm people's is healthy.Simultaneously, when stalk burns in the farmland, also can destroy the Soil structure and the eubiosis, cause the decline of soil quality.The lignocellulose straw refuse problem of Rural areas needs to be resolved hurrily, and producing methane through anaerobic fermentation is a up-and-coming technology, yet the restraining effect of the wooden structures of lignocellulose stalk makes the anaerobic fermentation gas production poor effect.Under this situation, the technology of developing a kind of effective processing rural area lignocellulose waste seems particularly urgent.
Summary of the invention
The objective of the invention is to overcome the technology that exists the wood fibre stalk to suppress problem in general anaerobic fermentation technology and the technology and a kind of preparing marsh gas by fermenting steam-exploded wood fiber straws is provided.
Purpose of the present invention can reach by following measure:
A kind of method of preparing marsh gas by fermenting steam-exploded wood fiber straws, packing into behind the straw chopping, it is quick-fried to carry out vapour in the quick-fried equipment of vapour, obtain Powdered and thread steam puffed stalk material, again the steam puffed stalk material is carried out anaerobic fermentation and go out biogas (a kind of is the gas of main combustiblecomponents with methane and hydrogen) in anaerobe solid/liquid/gas reactions device.
Method of the present invention is applicable to various stalks, but through experiment repeatedly, find when one or more of employing maize straw, wheat straw, straw, sorghum stalk, spartina alterniflora loisel, the quick-fried effect of its vapour is better under the quick-fried condition of vapour of the present invention, and the steam puffed stalk material that obtains carries out anaerobically fermenting, can output fine biogas more.Stalk need shred to 2cm～3cm long before vapour is quick-fried.
Above-mentioned lignocellulose straw are packed material into earlier in the steam-explosion jar when vapour is quick-fried, under certain pressure, keep the pressure certain hour, and instant decompression discharges prepared Powdered and thread steam puffed stalk material then.Need meet the following conditions in the quick-fried process of vapour: pressure 1.0MPa～3.0MPa, the too big or too little ferment effect that all can influence the quick-fried material of vapour of time 30s～200s, pressure, the control of time is also particularly important; The quick-fried condition optimization of vapour is: pressure 1.0MPa～2.0MPa, time 60s～120s.A kind of most preferred condition of the present invention is: pressure 1.5MPa, time 90s under this condition, can cooperatively interact with anaerobically fermenting after above-mentioned stalk vapour is quick-fried and reaches best ferment effect.
Steam puffed stalk material TS concentration in the zymotechnique is 4%～8% (quality), inoculation liquid concentration is 20%～40% (quality), the fermenting process temperature is made as 35 ℃～55 ℃, when carrying out anaerobically fermenting, anaerobe solid/liquid/gas reactions device can adopt one or more in full mixed anaerobic reaction device or the pulling flow type anaerobic reactor.
Methane content is higher in the obtained biogas of method of the present invention, is 65%-75% (volume).
Stalk basal component of the present invention is similar, the raw material that degradation characteristic is close carries out the quick-fried processing of vapour back anaerobically fermenting, can reach the purpose of certain destruction wood fibre structure, improve the biological degradation rate of lignocellulose raw material, thereby reach the purpose that improves anaerobe solid/liquid/gas reactions device energy output capacity.
The present invention is directed to the characteristics of rural area lignocellulose straw refuse and energy crop, the correlation technique in the field of environment protection is organically combined, be applied to control and resource utilization that rural area lignocellulose straw refuse pollutes.The present invention has the multi-functional that improves lignocellulose stalk anaerobic fermentation STRUCTURE DEPRESSION problem, obtains clean energy and handle rural area lignocellulose straw refuse simultaneously.
Description of drawings
Fig. 1 is the change curve of daily output tolerance in embodiment 1 fermenting process.
Fig. 2 is the change curve of cumulative gas production in embodiment 1 fermenting process.
Embodiment
Below in conjunction with the detailed explanation the present invention of embodiment, can reasonably adjust and revise according to different properties and the processing requirements of handling raw material in the actual application.
Embodiment 1
Adopting quick-fried processings of vapour spartina alterniflora loisel is fermentation raw material, and the quick-fried equipment of vapour is the production of Hebi, Henan right way Science and Technology Ltd., and it is 0.00875s that this equipment is produced the valve open time, and the quick-fried condition of vapour is 1.5MPa, the pressure 90s that holds time.Test adopts the batch fermentation mode to carry out, and adopts the 2500mL tap jar as anaerobic reactor, material gross weight 1500g, TS concentration is 6%, inoculum density is 45%, fermentation period 55d, test two parallel.During on-test, in reactor, charge into nitrogen 2min, use rubber stopper seal to drive the air in the reactor, and put it in the incubator, setting and cultivating the temperature inside the box is 35 ℃, adopts drainage to collect biogas, regularly manually shake reactor every day, plays the effect of material in the stirred reactor; Make regular check on the resistance to air loss of reaction unit.
Experimental result shows: bigger in earlier fermentation daily output tolerance, and aerogenesis is stable, has reached the aerogenesis peak period soon, reaches aerogenesis peak 1545ml in 13 days, and methane content is 67.8%; The highest 26425ml of cumulative gas production; And spartina alterniflora loisel's anaerobically fermenting control experiment of the quick-fried processing of vapour does not reach aerogenesis peak 1045ml 16 talentes, and methane content is 62.6%, and cumulative gas production 21486ml is far below the spartina alterniflora loisel's of the quick-fried processing of vapour anaerobic fermentation gas production effect.In the wood fibre configuration aspects, the degree of crystallinity of discovering spartina alterniflora loisel's raw material is 0.57, and the degree of crystallinity of the rice grass of the quick-fried processing of process 1.5MPa vapour is 0.63; The IR atlas analysis is 1630cm as can be known
-1The stretching vibration characteristic peak of the xylogen C=O of place, the spartina alterniflora loisel's peak shape herein after the quick-fried processing of vapour weaken 1510cm than spartina alterniflora loisel raw material
-1Phenomenon has appearred weakening in the stretching vibration peak of place's xylogen phenyl ring too, and this explanation steam explosion is brokenization wood fibre structure to a certain extent, and the hydrolysis that helps follow-up fermentation is carried out.
Embodiment 2
Adopting the quick-fried processing cornstalk of vapour is fermentation raw material, and the quick-fried equipment of vapour is that Hebi, Henan right way Science and Technology Ltd. produces, and it is 0.00875s that this equipment is produced the valve open time, and the quick-fried condition of vapour is 2.0MPa, the pressure 90s that holds time.Test adopts the batch fermentation mode to carry out, and adopts the 1000mL wide-necked bottle as anaerobic reactor, material gross weight 500g, TS concentration is 6%, inoculum density is 45%, fermentation period 60d, test two parallel.During on-test, in reactor, charge into nitrogen 2min, use rubber stopper seal to drive the air in the reactor, and put it in the incubator, setting and cultivating the temperature inside the box is 35 ℃, adopts drainage to collect biogas, regularly manually shake reactor every day, plays the effect of material in the stirred reactor; Make regular check on the resistance to air loss of reaction unit.
Experimental result shows: smaller in earlier fermentation daily output tolerance, raise gradually to ferment middle, and in 31 days, reach aerogenesis peak 890ml, methane content is 69.2%; The highest 11919ml of cumulative gas production, the TS of unit gas production rate is 397.3ml/g; And the acidifying phenomenon does not appear in the stalk anaerobic fermentation control experiment earlier fermentation of the quick-fried processing of vapour, after adding the damping fluid adjustment, reach aerogenesis peak 625ml 41 talentes, methane content is 59.8%, cumulative gas production 9891ml, the TS of unit gas production rate is 329.7ml/g, all far below the anaerobic fermentation gas production effect of the stalk of the quick-fried processing of vapour.
Claims (8)
1, a kind of method of preparing marsh gas by fermenting steam-exploded wood fiber straws, it is characterized in that packing into behind the straw chopping, it is quick-fried to carry out vapour in the quick-fried equipment of vapour, obtain Powdered and thread steam puffed stalk material, again the steam puffed stalk material is carried out anaerobic fermentation in anaerobe solid/liquid/gas reactions device and go out biogas.
2, the method for preparing marsh gas by fermenting steam-exploded wood fiber straws according to claim 1 is characterized in that described stalk is selected from one or more of maize straw, wheat straw, straw, sorghum stalk, spartina alterniflora loisel.
3, the method for preparing marsh gas by fermenting steam-exploded wood fiber straws according to claim 1 and 2 is characterized in that described straw chopping is long to 2cm～3cm.
4, the method for preparing marsh gas by fermenting steam-exploded wood fiber straws according to claim 1 is characterized in that the quick-fried condition of vapour is: pressure 1.0MPa～2.0MPa, time 60s～120s.
5, the method for preparing marsh gas by fermenting steam-exploded wood fiber straws according to claim 4 is characterized in that the quick-fried condition of vapour is: pressure 1.5MPa, time 90s.
6, according to the method for claim 1 or 4 described preparing marsh gas by fermenting steam-exploded wood fiber straws, the TS content when it is characterized in that steam puffed stalk material anaerobic fermentation gas production is 4%～8%.
7, the method for preparing marsh gas by fermenting steam-exploded wood fiber straws according to claim 1 is characterized in that the steam puffed stalk material when anaerobically fermenting, and inoculation liquid concentration is 20%～40%, and leavening temperature is 35 ℃～55 ℃.
8, the method for preparing marsh gas by fermenting steam-exploded wood fiber straws according to claim 1 is characterized in that the content of methane in the biogas of gained reaches 65%～75%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191278A (en) * | 2011-04-11 | 2011-09-21 | 重庆市农业科学院 | Technology of producing biogas with biomass straw through anaerobic fermentation |
| CN104962332A (en) * | 2015-06-23 | 2015-10-07 | 江苏河海新能源股份有限公司 | System and method of using plant biomass for preparing natural gas |
| CN105132467A (en) * | 2014-06-09 | 2015-12-09 | 宋安东 | Steam-exploded wet-stored corn straw two-phase anaerobic fermentation method |
| CN108384825A (en) * | 2018-05-15 | 2018-08-10 | 何治伟 | A kind of biogas production method |
-
2009
- 2009-04-03 CN CN200910029203A patent/CN101519668A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191278A (en) * | 2011-04-11 | 2011-09-21 | 重庆市农业科学院 | Technology of producing biogas with biomass straw through anaerobic fermentation |
| CN105132467A (en) * | 2014-06-09 | 2015-12-09 | 宋安东 | Steam-exploded wet-stored corn straw two-phase anaerobic fermentation method |
| CN104962332A (en) * | 2015-06-23 | 2015-10-07 | 江苏河海新能源股份有限公司 | System and method of using plant biomass for preparing natural gas |
| CN104962332B (en) * | 2015-06-23 | 2017-09-12 | 江苏河海新能源股份有限公司 | A kind of utilization plant biomass prepares the system and method for natural gas |
| CN108384825A (en) * | 2018-05-15 | 2018-08-10 | 何治伟 | A kind of biogas production method |
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Open date: 20090902 |