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A method and device for producing methane gas and lignin by using straw

A technology of lignin and methane gas, applied in the direction of supporting/immobilizing microorganisms, sterilization methods, gas production bioreactors, etc., can solve the problems of long process flow, high investment, high production cost, etc., and achieve simple process flow , Improve the efficiency of enzymatic hydrolysis and reduce the effect of inhibition

Inactive Publication Date: 2018-07-03
CATECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is long, high investment, large carbon dioxide emissions, and cannot effectively utilize the value of lignin
Furthermore, acid and hydrolytic enzymes are used to treat straw to completely hydrolyze cellulose and hemicellulose to obtain lignin, such as Chinese patent ZL200310121807.2. This method requires the use of a large amount of hydrolytic enzymes, which has high production costs and cannot effectively utilize hydrolysis. Product, straw utilization rate is low

Method used

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  • A method and device for producing methane gas and lignin by using straw

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Using corn stalks as the raw material 1, the corn stalk raw material 1 is first sent to the impurity removal and drying equipment 2 to remove water, soil, ash and other impurities, and the impurities and water 3 are discharged from the lower end. Then the dried and impurity-removed corn stalks are mechanically chopped into small sections of 8 cm and then sent to the gas explosion equipment 4, filled with 1.5 MPa saturated gas explosion steam 5, keeping the internal pressure of the equipment stable for 100 seconds, and opening the gas explosion equipment 4 The pressure relief solenoid valve 6 at the bottom releases the pressure instantly to complete the gas explosion process, and the raw material 1 is crushed into 0.8mm straw particles. The crushed straw is sent into the hydrolysis device 7 by the third vacuum pump, and straw hydrolytic enzyme 8 and hydrolyzed water 9 are added thereto, so that the mass ratio of straw in each hydrolysis tank: straw hydrolytic enzyme: hydro...

Embodiment 2

[0031] The straw raw material 1 is sent to the impurity removal and drying equipment 2 to remove impurities such as moisture, soil and ash, and the impurities and water 3 are discharged from the lower end. Then dry, the rice straw machine after impurity removal is chopped into 5cm segments and then sent to the gas explosion equipment 4, filled with the saturated gas explosion steam 5 of 1.5MPa therein, keeps the pressure in the gas explosion equipment 4 stable for 120s, and opens the gas explosion equipment. The pressure relief electromagnetic valve 6 at the bottom of the explosion device 4 releases the pressure instantaneously to complete the gas explosion process, and the straw raw material 1 is crushed into straw particles with a particle diameter of 0.6 mm. The crushed rice straw is sent into the hydrolysis equipment 4 by the third vacuum pump, and straw hydrolytic enzyme 8 and hydrolysis water 9 are added to each hydrolysis tank in the hydrolysis equipment 4, so that the s...

Embodiment 3

[0034] This embodiment is a preferred scheme of a device for producing methane gas and fiber-containing lignin by utilizing straw, and the reaction of Embodiment 1 or 2 can be carried out in the device of this embodiment. It includes straw removal and drying equipment 2, mechanical shredding device, gas explosion equipment 4, hydrolysis equipment 7, and anaerobic fermentation tank 10. The gas explosion equipment 4 is respectively fed with dried and mechanically chopped straw and gas Explosion steam 5, the outlet is connected to the pressure relief solenoid valve 6 and the third vacuum pump leading to the hydrolysis equipment 7. The hydrolysis equipment is fed with straw powder, hydrolytic enzyme 8 and hydrolyzed water 9 respectively, one path is connected to the first vacuum pump leading to the anaerobic fermentation tank 10 , and the other path is connected to the lignin pulp filter 15 .

[0035] The outlet of the lignin pulp filter 15 is connected to a drying device, anaerob...

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Abstract

The invention discloses a method and device for producing methane gas and lignin from straws. The method comprises the following steps of removing impurities of straws, crushing the straws into straw powder, feeding the straw powder into a hydrolysis device, controlling a hydrolysis degree until all hemicelluloses is hydrolyzed and 20-100% of cellulose is hydrolyzed, feeding an upper hydrolysate into an anaerobic fermentation pool, carrying out fermentation to obtain crude methane gas, discharging lower lignin slurry, and carrying out filtration and drying to obtain lignin powder. Straw hydrolase comprises excision beta glucanase, incision beta glucanase, beta glucosidase and xylanase according to a mass ratio of 1: 1.2-10: 0.8-5: 1.5-8. The culture contains an inducer activator, and in use, the culture is added with a starter. The method and device used by the method fully utilize straws, produce methane gas and lignin, adjust a straw hydrolysis degree, produce marketable products and are suitable for different raw materials.

Description

technical field [0001] The invention relates to a method and a device for producing methane gas and lignin by utilizing straw, and belongs to the field of effective utilization of agricultural waste and environmental protection. Background technique [0002] The amount of agricultural waste in my country is about 700 million tons every year, and a considerable amount of straw is piled up in the fields, yards or burned on the spot, and has not been effectively treated and utilized, resulting in a great waste of resources and environmental pollution. At the same time, the global energy crisis is getting worse day by day, and it is urgent to develop new energy sources that can replace oil and coal, especially renewable energy sources. The main component of crop straw is cellulose-based carbon compounds. Using biorefinery technology to convert agricultural waste such as straw into new materials and energy, not only solves the environmental pollution problem caused by the inciner...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02C08H7/00C12M1/12C12M1/107
CPCY02E50/30
Inventor 李苏安王坤朋邓清宇
Owner CATECH TECH
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