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Preparation method of wheat straw charcoal

A wheat straw and biochar technology, which is applied in the field of biochar preparation, can solve the problem of low utilization rate of wheat straw, and achieve the effects of improving utilization rate and added value, good ecological and social benefits, and broad application prospects.

Inactive Publication Date: 2015-07-08
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the utilization rate of wheat straw is generally not high at present, and only a small part is used for feed or paper making, and most of them are discarded in the field or directly burned or incinerated.

Method used

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  • Preparation method of wheat straw charcoal

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preparation example Construction

[0023] Embodiments of the present invention provide a method for preparing wheat straw biochar, comprising the following steps:

[0024] Wheat straw is pulverized, mixed with water, and then introduced into a hydrothermal reaction kettle for hydrothermal carbonization reaction. The ratio of the mass of the wheat straw to the volume of water is 1kg:5L~1kg:15L; the product of the hydrothermal carbonization reaction is cooled , separated by filtration, and dried to obtain wheat straw biochar.

[0025] In the above technical solution, the present invention realizes the comprehensive utilization of wheat straw, increases the added value, and can fix carbon and reduce emissions, and obtains a product that can be used for environmental pollution restoration, and has better economic and social benefits.

[0026] As a preferred solution, the present invention also includes a pretreatment step of the wheat straw: removing residual roots of the wheat straw, and removing surface soil and ...

Embodiment 1

[0035] Such as figure 1 As shown, wheat straw biochar was prepared according to the following steps:

[0036] Step 1. Recycling and pretreatment of wheat straw: after the wheat is harvested, the remaining wheat straw is recovered, and the soil and sundries on the surface of the wheat straw are removed;

[0037] Step 2, crushing of wheat straw: crushing the wheat straw to obtain small particles and small lumps of raw materials (less than 1 cm in length), storing them for later use;

[0038] Step 3. Hydrothermal carbonization of wheat straw: mix wheat straw with water, introduce into a hydrothermal kettle, ensure that the hydrothermal kettle is airtight, heat for hydrothermal carbonization reaction, and the hydrothermal reaction temperature is 160 o C, reaction time 14 h, wheat straw raw material and water-solid-liquid ratio 1kg:15L;

[0039] Step 4. Filtration and separation of solid and liquid phase products: After the hydrothermal carbonization process, stop heating, and co...

Embodiment 2

[0042] Step 1. Recycling and pretreatment of wheat straw: after the wheat is harvested, the remaining wheat straw is recovered, and the soil and sundries on the surface of the wheat straw are removed;

[0043] Step 2, crushing of wheat straw: crushing the wheat straw to obtain small particles and small lumps of raw materials (less than 1 cm in length), storing them for later use;

[0044] Step 3. Hydrothermal carbonization of wheat straw: mix wheat straw with water, import it into a hydrothermal kettle, ensure that the hydrothermal kettle is airtight, and heat for hydrothermal carbonization reaction. The hydrothermal reaction temperature is 200 o C, reaction time 10 h, wheat straw raw material and water-solid-liquid ratio 1kg:10L;

[0045]Step 4. Filtration and separation of solid and liquid phase products: After the hydrothermal carbonization process, stop heating, and cool the hydrothermal reactor to below 80 o After C, open a still to export reaction solution and solid pha...

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Abstract

The invention discloses a preparation method of wheat straw charcoal. According to the invention, wheat straw is taken as a raw material to prepare the charcoal, the wheat straw is converted to charcoal through a hydrothermal reaction; the invention provides a novel utilization mode of wheat straw, which increases comprehensive utilization rate and economic benefit of the wheat and increases added value. The preparation method has the advantages that process is clean and green, operation is simple, cycle utilization of resource is realized, the preparation method is in favor of fixing carbon, carbon dioxide discharge is reduced, the method has good ecological benefit, in addition, the method has the advantages of less energy consumption, low cost, and good industrial application prospect, can realize carbon sink increase and reduce emission, the prepared product can be used for improving soil and restoring water body environment, and application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of biochar preparation, in particular to a method for preparing wheat straw biochar. Background technique [0002] Biochar is a stable carbon-rich solid formed from biomass under anoxic or anaerobic conditions. Studies have shown that adding biochar to soil can improve soil fertility and promote crop growth. At the same time, the application of biochar to soil can inhibit the release of greenhouse gases, reduce the diffusion of pesticides in the soil and the accumulation in animals and plants. . In addition, biochar can adsorb pollutants, adding biochar to polluted water can improve water quality and repair water pollution. Therefore, carbonizing waste biomass into biochar is considered to be an effective method for carbon sequestration and biomass resource utilization. [0003] Biomass carbonization technology can be divided into pyrolytic carbonization and hydrothermal carbonization. Among them, pyroly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B09B3/00
Inventor 李音杨瑞芹单胜道刘宝鉴
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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