A method for preparing straw biochar by low-temperature and high-efficiency carbonization

A straw biological and high-efficiency technology, applied in the fields of carbon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low production efficiency, high carbonization reaction temperature, complex process, etc., to reduce energy consumption, improve production efficiency, and prepare low cost effect

Active Publication Date: 2019-07-30
河北龙云秸秆制气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is to pyrolyze and carbonize the sludge, and to produce ceramsite with carbon activity through a series of other processes. This method has positive significance for the resource utilization of heavy metal polluted soil, but as far as the biochar product prepared by it is concerned, The preparation process of this product is complicated, the carbonization reaction temperature is high, and the carbon activity of the product is insufficient
[0009] In summary, the existing biochar preparation technologies generally have the disadvantages of high carbonization temperature, long carbonization time, high energy consumption in the carbonization process, low production efficiency, and poor carbon activity of biochar products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing straw biochar by low-temperature and high-efficiency carbonization, the specific preparation steps are as follows:

[0033] Step 1: drying, dehydrating and drying the plant straw, so that the water content of the straw will be reduced to below 15%;

[0034] Step 2: crushing and refining, the plant straw dried in step 1 is crushed in a pulverizer until the particle size is about 5 mm;

[0035] Step 3: catalytic modification, put the dried and pulverized plant straw in step 2 into the reaction kettle, then add the catalytic enzyme cellulase, the added mass accounts for 1% of the mass of the plant straw; add plasticizer Erucamide, the added mass accounts for 3% of the plant straw mass, and the mixture is fully stirred for 2 hours at a temperature of 25-40°C to obtain plasticized plant straw;

[0036] Step 4: Low-temperature carbonization, the plasticized plant straw treated in step 3 is sent into the fluidized bed with nitrogen under high pressure, ...

Embodiment 2

[0040] A method for preparing straw biochar by low-temperature and high-efficiency carbonization, the specific preparation steps are as follows:

[0041] Step 1: drying, dehydrating and drying the plant straw, so that the water content of the straw will be reduced to below 15%;

[0042] Step 2: crushing and refining, the plant straw dried in step 1 is crushed in a pulverizer until the particle size is about 5 mm;

[0043] Step 3: catalytic modification, put the dried and pulverized plant straw in step 2 into the reactor, then add the catalytic enzyme cellulase, the added mass accounts for 2% of the mass of the plant straw; add plasticizer N,N'-methylenebisacrylamide, the added mass accounts for 5% of the mass of the plant straw, and the mixture is fully stirred for 2 hours at a temperature of 25-40°C to obtain plasticized plant straw;

[0044] Step 4: Low-temperature carbonization, the plasticized plant straw treated in step 3 is sent into the fluidized bed with nitrogen unde...

Embodiment 3

[0047] A method for preparing straw biochar by low-temperature and high-efficiency carbonization, the specific preparation steps are as follows:

[0048] Step 1: drying, dehydrating and drying the plant straw, so that the water content of the straw will be reduced to below 15%;

[0049] Step 2: crushing and refining, the plant straw dried in step 1 is crushed in a pulverizer until the particle size is about 5 mm;

[0050] Step 3: catalytic modification, put the dried and pulverized plant straw in step 2 into the reaction kettle, and then add the catalytic enzyme cellulase, the added mass accounts for 3% of the mass of the plant straw; add plasticizer Vinyl bisstearamide, the added mass accounts for 10% of the mass of the plant straw, and the mixture is fully stirred for 2 hours at a temperature of 25-40°C to obtain plasticized plant straw;

[0051] Step 4: Low-temperature carbonization, the plasticized plant straw treated in step 3 is sent into the fluidized bed with nitrogen...

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PUM

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Abstract

The invention provides a method for preparing straw biological carbon by low-temperature efficient carbonization. According to the method, plant straws are crushed, refined and dried, catalyzing enzyme and plasticizers are added, materials are sufficiently stirred, a lot of strong-polar hydroxide radical and phenolic hydroxyl functional groups in cellulose, hemi-cellulose and lignin in the crushed and refined straws can be disordered by the enzyme and the plasticizers, so that carbonization temperature of the straws is reduced, and carbonization and extrusion are performed under the oxygen deficient condition to obtain the straw biological carbon. The biological carbon is produced by the method, carbonation reaction temperature is low, carbonation reaction time is short, energy conservation and emission reduction are facilitated, production cost is reduced, and production efficiency is improved. On the other hand, the carbonation temperature of the biological carbon produced by the method is low, and activity of the biological carbon is better.

Description

technical field [0001] The invention relates to the field of preparation of biochar products, in particular to a method for efficiently carbonizing straw biochar under low temperature conditions. Background technique [0002] Biochar refers to biomass such as agricultural and forestry waste, which is a carbon-rich product formed by pyrolysis under anoxic and certain temperature conditions, which can turn agricultural waste such as straw into treasure. Biochar has excellent adsorption buffer capacity and fertilizer and water retention performance, which can effectively improve soil structure, increase fertility, and solve soil degradation problems, thereby realizing a virtuous cycle of agricultural production. The spokesperson of the Ministry of Agriculture said: This year, it is planned to allocate 600 million yuan of central financial funds to carry out pilot projects for the comprehensive utilization of straw in 60 major corn-producing counties in Northeast China. Strive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324
Inventor 陈庆曾军堂陈兵
Owner 河北龙云秸秆制气科技有限公司
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