Method for preparing marsh gas by using lignocellulose

A lignocellulose and biogas technology, applied in the field of biochemical bioenergy, can solve the problems of shortened initial gas production time, cumbersome pretreatment process, time-saving, labor-saving, and economical savings, and increase accessibility and effectiveness location, saving operating costs and time, and improving the efficiency of raw material utilization

Inactive Publication Date: 2010-07-14
NANJING UNIV OF TECH
View PDF2 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Chinese patent CN101519668A discloses a method for steam-exploded lignocellulosic straw fermentation to prepare biogas. In this method, the straw is chopped and loaded into steam-explosion equipment for steam-explosion, and the obtained steam-explosion materials are anaerobically processed in an anaerobic bioreactor. Fermentation produces biogas, which can obtain a higher amount of biological conversion, but the steam explosion treatment method requires high temperature and high pressure conditions, high energy consumption, and the amount of material treatment is difficult to scale up and continuous treatment
Chinese patent CN101560525A discloses a biomass pretreatment method and a method and equipment for producing biogas by anaerobic fermentation of biomass. This process requires cutting the material into short sections of 3-40mm, soaking in warm water and shredding the short sections. Relatively The preprocessing process is more cumbersome
[0010] Chinese patent CN1888073 discloses a biogas fermentation method for pretreatment of straw with compound bacterial agent. Firstly, the raw material of straw is crushed and wetted with water, and then compound bacterial agent and ammonium bicarbonate are added to the wetted straw as a nitrogen source for straw composting And add water, the fermentation speed and gas production speed of the pretreated straw are fast, the initial gas production time is shortened by about 50%, and the gas production rate is increased by more than 30%. In this process, the strains are not easy to obtain and require professional strain preservation technology , the addition of chemical reagents increases the cost of production, and if it is popularized in rural areas, corresponding professional skills are required
Chinese

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Raw materials for extrusion and puffing: combine dry corn stalks with OH - The NaOH solution with a concentration of 0.01mol / L was mixed and soaked according to the ratio of material to liquid 1:5 (kg:L) for 8 hours, and then added to a large twin-screw extruder (Jinan Dayi Extrusion Machinery Co., Ltd.) for extrusion treatment. The operating parameters are: Sleeve temperature 90°C, screw speed 20(r min -1 ), with a moisture content of 20%, steamed and exploded once.

[0031] Mixing inoculation: wet the treated lignocellulosic raw material with water and use dilute H 2 SO 4 The pH is adjusted to 6.0, and the slag water after biogas fermentation is put into the mixed material to obtain a mixed material. The slag water in the mixed material accounts for 50%wt, and the lignocellulose raw material content of anaerobic fermentation biogas production is 5%wt.

[0032] Fermentation gas production: put the uniformly mixed material into a 10L closed reactor for anaerobic ferm...

Embodiment 2

[0034] Raw materials for extrusion and puffing: combine bagasse with H + The HCl solution with a concentration of 0.01mol / L was mixed and soaked for 10 hours according to the ratio of material to liquid 1:15 (kg:L), and then added to a DS322II single-screw extruder (Jinan Saixin Extrusion Machinery Co., Ltd.) for extrusion and puffing. The parameters are: screw speed 180 (r min -1 ), moisture content 70%, steamed and exploded 3 times.

[0035] Mixture inoculation: wet the treated lignocellulosic raw material with water and add Ca(OH) 2 The pH is adjusted to 7.5, and the mixed material of the sludge put into the sewage treatment plant accounts for 20%wt of the sludge, and the content of the lignocellulose raw material for biogas production by anaerobic fermentation is 30%wt.

[0036] Fermentation gas production: put the uniformly mixed material into a 10L closed reactor for anaerobic fermentation at room temperature, collect the biogas generated in the reactor on the 10th day...

Embodiment 3

[0038] Raw materials for extrusion and puffing treatment: Add dry corn stalks directly into the DS322II single-screw extruder (Jinan Saixin Puffing Machinery Co., Ltd.), add water for extrusion and puffing treatment, operating parameters: screw speed 180 (r min -1 ), moisture content 70%, steamed and exploded 3 times.

[0039] Mixing inoculation: wet the treated lignocellulosic raw material with water and use dilute H 2 SO 4 The pH is adjusted to 6.0, and cow dung is put in to obtain a mixed material. The cow dung accounts for 20%wt in the mixed material, and the lignocellulose raw material content of anaerobic fermentation biogas is 25%wt.

[0040] Fermentation gas production: put the uniformly mixed material into a 10L closed reactor for anaerobic fermentation at room temperature, collect the biogas generated in the reactor on the 10th day, measure the volume and composition of the biogas, and use the same biogas as the raw material that has not been extruded and expanded. ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for preparing marsh gas by using lignocellulose, which comprises the following steps: first pre-treating a lignocellulose raw material by an extrusion bulking method, then uniformly mixing the pre-treated lignocellulose raw material and nutrient substances for producing marsh gas bacteria by anaerobic fermentation, and feeding the mixture into an anaerobic fermentation bioreactor to perform anaerobic fermentation to produce the marsh gas. The pre-treating method for the lignocellulose raw material is characterized in that the operation is simple, the method can continuously treat the materials in batch, the biodegradability and the fermentation speed of the treated raw materials are improved, the conversion rate of biomass is greatly improved, and the fermentation residues can be used as agricultural efficient organic fertilizers.

Description

1. Technical field [0001] The invention belongs to the technical field of biochemical bioenergy, and relates to a method for producing biogas by processing lignocellulose, in particular to a method for producing biogas through screw extrusion pretreatment combined with fermentation. 2. Background technology [0002] my country is a large agricultural country. According to statistics, there are about 1 billion tons of crop straw and forestry processing waste in my country every year. A large amount of crop straw is stored in rural areas. Although a small part has been utilized as a resource, there is still a large amount of surplus, which is dumped and burned at will, causing a large number of social problems such as air pollution, soil mineralization, fire accidents, and traffic jams. , economic and ecological issues; at the same time, as a renewable energy source, straw contains huge biomass energy, and its resource utilization is of great significance to energy conservatio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 黄和张红漫林增祥张秋翔赵晶张孟麒
Owner NANJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap