A method for preparing biogas from irradiated pretreatment crop straw

A technology for crop straw and pretreatment, applied in waste fuel, fermentation and other directions, can solve problems such as raw material floating, and achieve the effect of saving energy, improving soil, and enhancing buffer capacity.

Active Publication Date: 2022-03-18
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, and provide a method for producing biogas by irradiating and pretreating crop stalks, which can fully utilize the crop stalks, increase gas production, improve the utilization rate of raw materials, and reduce fermentation time. Reduce the energy consumption of straw crushing, solve the problem of raw material floating in the fermentation process, improve the efficiency of resource utilization, energy utilization and harmlessness of crop straw, and at the same time reduce the difficulty of separation of slag and liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Collect corn straw, cut into a small section of 2-4cm long after dryness; put the chipped corn stalk into the irradiation device, use it under natural room temperature conditions 60 CO-gamma ray irradiation, irradiation dose is 1200 kGy; the corn stalk with irradiation pretreatment is added to the reactor in the ratio of 1: 5 according to the volatile solid concentration (Vs), and then adding to corn stover. And the total weight of the total weight of the inoculum, mix, as a fermentation, control the total solids concentration of the fermentation body of 28%, anaerobic digestion in anaerobic digestion under 35 ° C-39 ° C, digestive time is 22 sky.

[0022]The methane generating rate of this embodiment reaches 250 l / kg vs, the gas gas is stable, and after the drying is dried, it is applied to the ground without "burning seedlings". In this example, the inoculum used is a normal gas-produced biogas tank of the biogas tank mixture, and the total solid material (TS) content o...

Embodiment 2

[0024] Collect rice straw, after natural drying, cut into a small section of 2-4CM long; put the cut rice straw into the irradiation device, use it under natural room temperature 60 The CO-γ ray irradiation, the irradiation dose is 600 kGy; the raw rice straw and inoculum after irradiation, adding the reactor in a ratio of 1: 2 in accordance with the volatile solid concentration (Vs), and then adds to rice straw and The total weight of the inoculum is 6% biomass carbon, mixing as a fermentation, controlling the total solid material (TS) concentration of the fermentation body to 25%, anaerobic digestive biogas, the digestive time is carried out under 35 ° C-39 ° C. 20 days.

[0025] The methane generating rate of this embodiment reaches 212 l / kg vs, the gas production is stable, and the anti-slag is applied to the ground without "burning seedlings". The inoculum used in this example is a normal gas-produced biogas tank, a mixture of biogasic tank, and is determined, and the total...

Embodiment 3

[0027] Collect corn and rice straw, cut into a small section of 2-4CM long after dryness; put the cut straw into the irradiation device in natural room temperature conditions 60 CO-gamma ray irradiation, irradiation dose is 900 kGy; the straw and inoculum after irradiation is added to the reactor in the ratio of 1: 3 according to the volatile solid concentration (Vs), and then adding to straw and The total weight of the inoculum is 8% of the biomass carbon, mixing as a fermentation body, and controls the total solid form (TS) concentration of the fermentation body to 20%, and anaerobic digestion is carried out at 35 ° C - 39 ° C, and the digestive time is 24 days.

[0028] The methane production rate of this embodiment reaches 205 l / kg vs, the gas gas is stable, and the anti-slag is applied to the ground without a "burning seedlings". The inoculum used in this example is the residue after anaerobic digestion of Example 1.

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Abstract

A method for preparing biogas by utilizing irradiation pretreated crop straws, comprising placing the dry cut crop straws in an irradiation device, and irradiating them at a dose of 600kGy-1200kGy. 60 After being irradiated with Co-γ rays, mix with the inoculum at a ratio of 1:1.5-5 according to the volatile solid concentration, add biochar with a total weight of 2%-8% of the total weight of crop straw and inoculum, mix well, and use as fermentation and control the total solid concentration of the fermented body to be between 20% and 28%, and carry out anaerobic digestion at 35℃-39℃ for 20-24 days. The method has the advantages of simple operation, high utilization rate of straw, fast fermentation speed, stable gas production, and methane yield (without CO). 2 ) can reach 200-250L / kgVS, no biogas slurry is produced in the whole process, and the biogas residue is fully fermented.

Description

Technical field [0001] The present invention relates to a method of making biogas using crop straw, specifically a method of irradiating the pretreatment of crop straw to make biogas. Background technique [0002] The amount of crop straw is large, the price is low, and it is easy to collect. It is a very important lignocellulosic biomass material. my country has more than 1.5 billion mu, producing about 700 million tons of straw each year, and these straw are directly returned to the fertilizer and a small part as animal feed, and a large part is directly incinerated, which not only caused serious environmental pollution, but also Wasted valuable resources. Digestion of crop straw anaerobic, not only producing methane as an energy source, but also the fertilizer used as a crop growth as a crop growth, and has become an important way to comprehensively utilize the comprehensive util of crop straw resources around the world. However, the use of straw production biogas currently ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCC12P5/023C12P2201/00C12P2203/00Y02E50/30
Inventor 王锋苏小军李清明
Owner HUNAN AGRICULTURAL UNIV
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