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Method for preparing biomass carbon by utilizing agricultural and forestry waste

A technology of agricultural and forestry waste and biochar, which is applied in the field of carbon material preparation and biomass resource utilization, can solve the problems of high cost, complex process, unsustainable source, etc., achieve high carbon content and calorific value, and simple preparation method , Conducive to the effect of industrialization promotion

Inactive Publication Date: 2012-07-18
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a method for preparing biochar from agricultural and forestry wastes, using agricultural and forestry waste resources as raw materials for preparation, so as to solve the unsustainable source and complicated process caused by the current carbon material preparation using wood and coal as raw materials , the problem of high cost

Method used

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  • Method for preparing biomass carbon by utilizing agricultural and forestry waste
  • Method for preparing biomass carbon by utilizing agricultural and forestry waste

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Preparation of biochar by using agricultural waste corn stalks.

[0027] (1) Cut the collected agricultural waste corn stalks into small pieces, dry them in an oven at 60°C for 16 hours, pulverize them with a pulverizer and collect 40-60 mesh components;

[0028] (2) Fully mix the powdery raw materials and deionized water at a mass ratio of 1:10, and let stand for 4 hours. Then the mixture was transferred to a high-pressure reactor, under the protection of nitrogen, the temperature was raised to 250°C at a rate of 4°C per minute, and the reaction was carried out for 4 hours. The pressure of the reactor was 4.0MPa, and the rotation speed of the reactor was 150 rpm;

[0029] (3) After the reaction, the autoclave was cooled to room temperature. Then the obtained solid residue was vacuum filtered, washed with hot water, and dried in an oven at 60° C. for 16 hours to obtain biochar.

[0030] In the biochar prepared in this example, the yield of biochar is 35.48%...

Embodiment 2

[0031] Example 2: Preparation of biochar by utilizing forestry waste shrub tamarisk.

[0032] (1) The collected forestry waste shrub red willow was cut into small pieces, dried in an oven at 60° C. for 16 hours, pulverized with a pulverizer and collected 40-60 mesh components.

[0033] (2) Fully mix wood flour and deionized water in a mass ratio of 1:10, and let stand for 4 hours. Then the mixture was transferred to a high-pressure reactor, and under the protection of nitrogen, the temperature was raised to 250° C. at a rate of 4° C. per minute, and the reaction was carried out for 4 hours. The pressure of the reactor was 4.0 MPa, and the rotation speed of the reactor was 150 rpm.

[0034] (3) After the reaction, the autoclave was cooled to room temperature. Then the obtained solid residue was vacuum filtered, washed with hot water, and dried in an oven at 60° C. for 16 hours to obtain biochar.

[0035] In the biochar prepared in this example, the biochar yield rate is 38.1%, ...

Embodiment 3

[0036] Example 3: Preparation of biochar by using forestry waste eucalyptus, a broad-leaved wood.

[0037] (1) The collected forestry waste eucalyptus broad-leaved wood raw material was cut into small pieces, dried in an oven at 60° C. for 16 hours, pulverized with a pulverizer and collected 40-60 mesh components.

[0038] (2) Fully mix wood powder and deionized water in a mass ratio of 1:16, and let stand for 5 hours. Then the mixture was transferred to a high-pressure reactor, and under the protection of nitrogen, the temperature was raised to 250° C. at a rate of 4° C. per minute, and the reaction was carried out for 2 hours. The pressure of the reactor was 4.0 MPa, and the rotation speed of the reactor was 150 rpm.

[0039] (3) After the reaction, the autoclave was cooled to room temperature. Then the obtained solid residue was vacuum filtered, washed with hot water, and dried in an oven at 60° C. for 16 hours to obtain biochar.

[0040] In the biochar prepared in this e...

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Abstract

The invention relates to a method for preparing biomass carbon by utilizing agricultural and forestry waste, belonging to the technical fields of preparation of carbon materials and utilization of biomass resources. The method comprises the following steps of: adopting agricultural and forestry waste as raw materials; under the condition of subcritical water, fully mixing dried biomass materials and deionized water according to the proportion of 1:(10-30); under the protection of inert atmosphere, carbonizing for 2-6 hours at the temperature of 220-250 DEG C; and then carrying out vacuum filtration and hot-water cleaning, and drying to obtain the biomass carbon. The biomass carbon prepared by the invention is coaly carbon material with an aromatic-ring structure, is high in carbon content and calorific value and large in specific surface area, and can be used as a soil conditioner or an absorbent. The method has the advantages that the materials are low in cost and easy to obtain, the process is simple, the operation is convenient, the manufacturing cost is low, the industrial promotion is convenient, and the application range and the application value of biomass resources are further expanded in the aspect of carbon materials.

Description

technical field [0001] The invention relates to a method for preparing biochar from agricultural and forestry waste, in particular to a method for preparing biochar with high carbon content and high calorific value from agricultural and forestry waste, which belongs to the preparation of carbon materials and the utilization of biomass resources technology field. Background technique [0002] With the shortage of energy and resources and the increasingly serious environmental pollution, the research on the utilization of biomass resources has attracted extensive attention. Biomass resources such as agricultural waste, forestry biomass, energy plants, aquatic plants, etc. are renewable resources and have become substitutes for petroleum resources, and most biomass resources are rich in carbon elements, so they have become a good choice for the preparation of various carbon materials. Rich raw materials. These renewable biomass resources can be converted into biomass fuels an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B09B3/00C01B32/05
CPCY02W30/78
Inventor 肖领平孙润仓许凤史正军
Owner BEIJING FORESTRY UNIVERSITY
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