Preparation method of rice straw biochar

A technology of rice straw and biochar is applied in the field of preparation of rice straw biochar, which can solve the problem of low utilization rate of rice straw, and achieve the effects of improving comprehensive utilization rate and added value, mild reaction conditions and increasing economic benefits.

Inactive Publication Date: 2015-06-24
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

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

Method used

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  • Preparation method of rice straw biochar

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preparation example Construction

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

[0024] The rice straw is crushed, mixed with water, and then introduced into a hydrothermal reaction kettle for hydrothermal carbonization reaction. The ratio of the mass of the rice straw to the volume of water is 1kg:5L~1kg:20L; the product of the hydrothermal carbonization reaction is cooled , separated by filtration, and dried to obtain rice straw biochar.

[0025] In the above technical solution, the present invention realizes the comprehensive utilization of rice 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 rice straw: removing soil and sundries on the surface of the rice straw.

[0027] As a pre...

Embodiment 1

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

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

[0037] Step 2, crushing of rice straw: crushing the rice 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 rice straw: mix rice 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 150 o C, reaction time 14 h, rice straw raw material and water-solid-liquid ratio 1kg:5L;

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

Embodiment 2

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

[0043] Step 2, crushing of rice straw: crushing the rice 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 rice straw: mix rice straw with water, import it into a hydrothermal kettle, ensure that the hydrothermal kettle is airtight, and heat it for hydrothermal carbonization reaction. The hydrothermal reaction temperature is 200 o C, reaction time 6 h, rice 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 oAfter C, open a still to export reaction solution and solid phase produ...

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Abstract

The invention discloses a preparation method of rice straw biochar. The preparation method has the beneficial effects that rice straws serve as raw materials for preparation of biochar and the rice straws are transformed into biochar through hydrothermal reaction, thus providing a new rice straw utilizing mode, increasing the comprehensive utilization rates of the rice and the economic benefits and increasing the additional value; the preparation method is clean and green in processes, is simple to operate, conduces to achieving cyclic utilization of resources, is beneficial to carbon fixation and reduction of emission of carbon dioxide and has good ecological benefits; besides, the method is low in energy consumption and cost, has good industrial application prospects and can achieve sink increase and emission reduction; the prepared product can be also applied to improving soil and restoring the water environment and has extensive application prospects.

Description

technical field [0001] The invention relates to the technical field of biochar preparation, in particular to a method for preparing rice 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, pyrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B09B3/00
CPCB09B3/00C01B32/05
Inventor 李音单胜道盖希坤杨瑞芹毛建卫
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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