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

A crop straw and biochar technology, applied in the fields of biofuels, special forms of dry distillation, petroleum industry, etc., can solve the problems of air pollution, low biochar yield, low carbonization degree, etc., and achieve high biochar quality and high carbonization degree. , the effect of high production efficiency

Inactive Publication Date: 2015-01-07
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: On-site production of biochar using elephant grass straw as raw material

[0030] The size of the soil pyrolysis pool is 1.2m×1.0m×0.3m, the air-dried elephant grass straw is 15 kg, the stacking size is 1.2m×2.0m×0.8m, the burning time is 2 minutes under the condition of sufficient oxygen, and the soil covering time is 3 minutes, the peak temperature of biomass combustion was 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), while the total smoke output of the control was 2.61×10 8 ±4.67×10 7 smoke pixel ( n =3).

[0033] The obtained biochar has uniform carbonization and high carbonization degree.

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

Embodiment 2

[0035] Example 2: On-site production of biochar using corn grass stalks as raw material

[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 stacking size is 1.2m×1.6m×0.6m, the burning time is 3 minutes under the condition of sufficient oxygen, and the soil covering time is 3 minutes, the peak temperature of biomass combustion was 645°C.

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

[0038] The obtained biochar has uniform carbonization and high carbonization degree.

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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, in particular to a method for large-scale on-site production of biochar by using crop stalks. Background technique [0002] According to the definition of the International Biochar Initiative (IBI), biochar (biochar) is a substance formed by high-temperature pyrolysis of biomass under anoxic conditions, and these substances are applied to the soil to obtain agricultural and environmental benefits. A large number of studies in recent years have shown that the application of biochar in soil can effectively sequester CO in the atmosphere. 2 , and can improve soil quality and crop yield from many aspects (pH, CEC, nutrient use efficiency, water use efficiency, bioavailability of heavy metals and organic pollutants, etc.). It is estimated that the global agricultural soil sequestration of biochar can be as high as 428 billion tons. Therefore, there will be a huge global market demand for biochar for ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/02C10B57/00
CPCY02E50/14Y02E50/10
Inventor 周启发
Owner ZHEJIANG UNIV
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