Method for preparing biochar by taking organic solid wastes of agriculture and forestry as raw materials in wet thermal cracking manner

A technology of organic solids and biochar, applied in the fields of biofuels, special forms of dry distillation, petroleum industry, etc., can solve the problems of low yield of biochar, and achieve the effect of reducing carbon emissions, increasing production added value, and low energy consumption

Inactive Publication Date: 2014-10-08
ANHUI SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, slow pyrolysis or multi-stage temperature-controlled pyrolysis technology is mostly used in the biochar preparation process, such as patents 201310643730.9 and 201410120785.6, but the yield of biochar in these preparation processes is still low

Method used

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  • Method for preparing biochar by taking organic solid wastes of agriculture and forestry as raw materials in wet thermal cracking manner
  • Method for preparing biochar by taking organic solid wastes of agriculture and forestry as raw materials in wet thermal cracking manner

Examples

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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, a method for preparing biochar by wet pyrolysis using agricultural and forestry organic solid waste as raw material, including the following steps: after cleaning the wheat straw raw material from impurities such as sediment, washing it with deionized water, air-drying naturally, and crushing through a 60-mesh sieve . Prepare a concentration of 0.20 mol / L zinc chloride solution, mix and stir wheat straw and zinc chloride solution at a ratio of 1:10, let stand for 24 hours, then filter with quantitative filter paper, absorb the surface water of wheat straw with absorbent paper, and place In a tubular atmosphere furnace, nitrogen was used as a protective gas for thermal cracking. Nitrogen flow rate is 0.1m 3 / h, in the first stage, the temperature is raised rapidly to 200°C, and then kept for 10 minutes, with a heating rate of 50°C / min; the second stage is a sub-slow heating process, with a heating rate of 5°C / min, heated to 350°C, and kept f...

Embodiment 2

[0028] Such as figure 1 As shown, a method for preparing biochar by wet thermal cracking of agricultural and forestry organic solid waste as raw material, comprising the following steps: after cleaning the corncob raw material from impurities such as sediment, washing it with deionized water, air-drying naturally, and crushing through a 60-mesh sieve . Prepare a concentration of 0.20 mol / L zinc chloride solution, mix corncob and zinc chloride solution at a ratio of 1:10, let stand for 24 hours, then filter with quantitative filter paper, dry the surface water of corncob with absorbent paper, and place In a tubular atmosphere furnace, nitrogen was used as a protective gas for thermal cracking. Nitrogen flow rate is 0.1m 3 / h, in the first stage, the temperature is raised rapidly to 200°C, and then kept for 10 minutes, with a heating rate of 50°C / min; the second stage is a sub-slow heating process, with a heating rate of 5°C / min, heated to 350°C, and kept for 1 hour; In the ...

Embodiment 3

[0030] Such as figure 1 As shown, a method for preparing biochar by wet pyrolysis using agricultural and forestry organic solid waste as raw material comprises the following steps: after cleaning the sawdust raw material from impurities such as sediment, washing it with deionized water, air-drying naturally, and crushing through a 60-mesh sieve. Prepare a concentration of 0.20 mol / L zinc chloride solution, mix and stir the sawdust and zinc chloride solution at a ratio of 1:10, let it stand for 24 hours, then filter it with quantitative filter paper, absorb the water on the surface of the sawdust with absorbent paper, and place it in a tube In a type atmosphere furnace, nitrogen is used as a protective gas for heating and cracking. Nitrogen flow rate is 0.1m 3 / h, in the first stage, the temperature is raised rapidly to 200°C, and then kept for 10 minutes, with a heating rate of 50°C / min; the second stage is a sub-slow heating process, with a heating rate of 5°C / min, heated t...

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Abstract

The invention relates to a method for preparing biochar by taking organic solid wastes of agriculture and forestry as raw materials in a wet thermal cracking manner. The method comprises the following steps: cleaning, airing, crushing and screening raw materials, and then mixing and stirring the raw materials with 0.20mol/L zinc chloride solution according to the ratio of 1 to 10, and filtering the mixture after standing for 24 hours, wherein the moisture content of the raw materials is controlled between 45.23% and 69.65%; then putting the raw materials into a tubular atmosphere furnace, and carrying out heating cracking by taking nitrogen of which the flow rate is 0.1m<3>/h as a protective gas, wherein at the first stage, quick heating to 200 DEG C, and then heat preservation for 10 minutes are performed, and the heating rate is 50 DEG C/min; the second stage is a slow heating process, the heating rate is 5 DEG C/min, and heating to 350 DEG C and heat preservation for an hour are performed; the third stage is a slow heating stage, the heating rate is 1 DEG C/min, and heat preservation is performed for 2 hours after heating to 400 DEG C; finally screening the solid substances by a 200-mesh sieve; rinsing and baking into constant weight, so as to obtain a biochar product. The method is wide in raw material source, simple in process, and high in biochar yield; the produced biochar has excellent adsorptive property; the production additional value can be increased by tar, smoke and the like generated in the preparation process; the production cost is reduced.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste and preparation of new carbon materials, in particular to a method for preparing biochar by wet thermal cracking using agricultural and forestry organic solid waste as raw materials and a biochar product prepared according to the method. Background technique [0002] People from the black soil in the middle of the Amazon Basin in South America ( Terra Preta de Indio ) research, gradually recognized the important role of biochar as a carbon dioxide capture and carbon sequestration agent, making biochar become the focus of global scientific research and media attention. Biochar is rich in organic carbon and has strong water absorption capacity. It can be applied to soil as a fertilizer carrier and water-retaining agent, which can significantly increase soil organic carbon content and soil water content; biochar contains certain mineral nutrients and its own alkaline characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02
CPCY02E50/10
Inventor 谢越马万征李飞跃汪建飞肖新李孝良王艳
Owner ANHUI SCI & TECH UNIV
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