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Method for coupling biogas preparation by means of maize straw with power generation waste-heat utilization

A corn stover, biogas power generation technology, applied in fermentation, mechanical equipment, biosynthesis and other directions, can solve the problems of reducing the efficiency of hydrothermal treatment, reducing the direct contact area of ​​steam with refractory cellulose and lignin structures, etc. The effect of preparation efficiency, shortening fermentation cycle and improving efficiency

Active Publication Date: 2015-11-11
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the presence of soluble sugars and easily biodegradable hemicellulose in raw materials will reduce the direct contact area between steam and refractory cellulose and lignin structures, thereby reducing the treatment efficiency of hydrothermal treatment

Method used

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  • Method for coupling biogas preparation by means of maize straw with power generation waste-heat utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In July, collect 50 tons of green corn stalks that have just been harvested from green corn (corn in the milk ripening stage). The solid content (TS) of the corn stalks is 20%, and the volatile solid content (VS) is 18%. Diameter ≤ 10mm; add 50 tons of biogas slurry from the solid-liquid separation of the high-temperature fermentation residue at the back end, mix it with corn stalks, adjust the total solid mass percentage of the mixed material to 10%, and the temperature of the mixed material is about 25°C , through mud-water heat exchange to recover the heat of the high-temperature fermentation residue at the rear end, and use the heat in the form of hot water to increase the temperature of the above-mentioned mixed material to 30°C; Fermentation, the heat of cooling water (50°C) and cylinder jacket water (85°C) in the biogas generator set is recovered through water-water heat exchange, and the heat is used in the form of hot water to increase the temperature and heat p...

Embodiment 2

[0041] In September, collect 30 tons of corn stalks that have just harvested dry corn (fully mature corn), the solid content (TS) of corn stalks is 35%, the volatile solid content (VS) is 30%, and it is crushed to a particle size of ≤ 10mm; add 57.5 tons of biogas slurry from the solid-liquid separation of the high-temperature fermentation residue at the back end, mix it with corn stalks, and adjust the total solid mass percentage of the mixed material to 12%. At this time, the temperature of the mixed material is about 20°C. -Water heat exchange recovers the heat from the high-temperature fermentation residue at the back end, and uses the heat in the form of hot water to increase the temperature of the above-mentioned mixture to 28°C; -Water heat exchange recovers the heat of the cooling water (55°C) and cylinder jacket water (90°C) in the biogas generator set, and uses the heat in the form of hot water to increase the temperature of the medium-temperature fermentation materia...

Embodiment 3

[0043] In December, 11 tons of dried corn stalks were collected after being air-dried and stored in the sun. The solid content (TS) of the corn stalks was 90%, and the volatile solid content (VS) was 82%. 55 tons of biogas slurry after the solid-liquid separation of the high-temperature fermentation residue at the back end is mixed with corn stalks, and the total solid mass percentage of the mixed material is adjusted to 15%. At this time, the temperature of the mixed material is about 15°C, and it is recovered through mud-water heat exchange The heat of the high-temperature fermentation residue at the back end is used in the form of hot water to increase the temperature of the above-mentioned mixed material, and the temperature is increased to 25°C; Recover the heat of the cooling water (60°C) and cylinder jacket water (95°C) in the biogas generator set, and use the heat in the form of hot water to increase the temperature and heat preservation of the medium-temperature fermen...

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Abstract

The invention relates to a method for coupling biogas preparation by means of maize straw with power generation waste-heat utilization. The method comprises the first step of maize straw smashing, the second step of thermal refining and heating, the third step of middle temperature fermentation, the fourth step of solid-liquid separation, the fifth step of hydro-thermal treatment, the six step of high temperature fermentation, the seventh step of heat exchange of fermentation residues and the solid-liquid separation, the eighth step of biogas residue drying and the ninth step of biogas power generation and waste-heat utilization. Compared with the prior art, the biogas preparation technology of combining the middle temperature fermentation and the hydro-thermal treatment with the high temperature fermentation is adopted, the biogas yield of raw materials is improved, and the fermentation period is shortened; the biogas preparation technology including the middle temperature fermentation, the hydro-thermal treatment and the high temperature fermentation is combined with waste-heat comprehensive utilization of the biogas power generation, the biogas preparation efficiency of the maize straw is improved, the comprehensive energy consumption of a system is reduced, gradient comprehensive utilization is conducted according to grades of waste heat sources of the biogas power generation, and the heat utilizing efficiency of the system is higher.

Description

technical field [0001] The invention relates to the field of renewable energy development, in particular to a method for preparing corn stalk biogas coupled with power generation waste heat utilization. Background technique [0002] China is a large agricultural country, which produces about 800 million tons of crop straw every year, of which corn straw produces the largest amount, accounting for 40.6% of the total straw production. Using biogas fermentation technology to process and utilize corn stalks can not only produce efficient, clean and high-grade energy, but also produce biogas residue and biogas slurry can be directly used as organic fertilizers, which is an effective way out. Biogas fermentation technology itself is a very mature technology. Using this technology to convert straw into new energy can alleviate the shortage of conventional energy in my country and improve the quality of life of rural people; on the other hand, it can also solve the problem of crop s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02F02G5/02
CPCY02E20/14Y02E50/30Y02P20/129Y02P20/59Y02T10/12
Inventor 李东刘晓风袁月祥闫志英李志东
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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