Method for large-scale on-site production of biochar from crop straws

A technology of crop straw and biochar, which is applied in the direction of biofuel, special dry distillation, coke oven, etc., can solve the problems of air pollution, low biochar output, and low carbonization degree, and achieve high quality biochar and high carbonization degree , the effect of high production efficiency

Inactive Publication Date: 2013-08-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Biochar can also be obtained by the traditional biomass combustion method, but its biochar yield is low, carbonization is uneven, the degree of carbonization is generally not high, and a large amount of smoke is produced, which seriously pollutes the atmospheric environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Using elephant grass straw as raw material to produce biochar on site

[0030] The size of the soil pyrolysis pool is 1.2m×1.0m×0.3m, 15 kg of air-dried elephant grass straw, and the stack size is 1.2m×2.0m×0.8m. The burning time is 2 minutes under sufficient oxygen conditions and the soil covering time is 3 Minutes, the peak temperature of biomass combustion is 676°C.

[0031] The yield of biochar is 18.1±1.4kg / 100kg ( n =12).

[0032] The total smoke emission of this method is 1.17×10 7 ±7.28×10 6 Smoke pixel ( n =3), and the total smoke emission of the control is 2.61×10 8 ± 4.67×10 7 Smoke pixel ( n =3).

[0033] The obtained biochar is uniformly carbonized and has a high degree of carbonization.

[0034] The obtained biochar has a high C / H ratio and a large surface area, so the degree of carbonization is high.

Embodiment 2

[0035] Example 2: Using corn straw as raw material to produce biochar on site

[0036] The size of the soil pyrolysis pool is 1.2m×1.0m×0.3m, the air-dried elephant grass straw is 10 kg, the stack size is 1.2m×1.6m×0.6m, the burning time is 3 minutes under the sufficient oxygen condition, and the soil covering time is 3 Minutes, the peak temperature of biomass combustion is 645°C.

[0037] The output of biochar is 19.0±1.8kg / 100kg ( n =12).

[0038] The obtained biochar is uniformly carbonized and has a high degree of carbonization.

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PUM

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Abstract

The invention discloses a method for large-scale on-site production of biochar from crop straws. The method comprises the following steps of building a soil pyrolysis tank in an open space, stacking air-dried crop straws on the soil pyrolysis tank according to a certain dimension, burning the crop straws under the condition of enough oxygen in a short time, and fast covering the burning area by soil so that the fire is extinguished completely, wherein by heat produced by combustion of a small part of biomass, under the conditions of low oxygen content and thermal resistance caused by soil covering, the rest of the biomass can be fast pyrolyzed into high-quality biochar. The biochar obtained by the method has the advantages of high yield, good charing uniformity, high charing level and low smoke production amount.

Description

Technical field [0001] The invention belongs to the field of biomass energy, and particularly relates to a method for large-scale on-site production of biochar by using crop straw. Background technique [0002] According to the definition of the International Biochar Initiative (IBI), biochar is a substance formed by the pyrolysis of biomass under hypoxic conditions. These substances are applied to the soil to obtain agricultural and environmental benefits. A large number of studies in recent years have shown that applying biochar in the soil can effectively store CO in the atmosphere 2 And it can improve soil quality and increase crop yield from many aspects (pH, CEC, nutrient utilization rate, water utilization rate, biological availability of heavy metals and organic pollutants, etc.). It is estimated that the global storage of biochar in agricultural soils can reach 428 billion tons. Therefore, there will be a huge market demand for biochar used in agriculture in the future....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02C10B57/00
CPCY02E50/10
Inventor 周启发
Owner ZHEJIANG UNIV
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