Method for preparing biomass carbon based on waste crop straw

A technology of crop straw and biomass charcoal, which is applied in the fields of biofuels, special forms of dry distillation, petroleum industry, etc. the effect

Inactive Publication Date: 2011-03-30
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, although it has been confirmed that many organic substances can be used to effectively prepare biochar, due to various reasons, the production of biochar at this stage is still limited to a small scale and has not been widely used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Cut the collected rice straw into 2-3mm straw particles, wash with water and 1mol / L hydrochloric acid, and then put it into a vacuum oven at 100°C for drying;

[0032] (2) Pack the pretreated and dried stalk particles into the quartz tube of the carbonization furnace, and before heating, feed helium to remove the air in the carbonization furnace, the gas flow rate is 200mL / min, and the duration is 60min;

[0033] (3) In an environment with an inert gas flow rate of 100mL / min, the temperature in the carbonization furnace was heated from room temperature to 550°C at a heating rate of 25°C / min for 2 minutes, and then the heating was stopped, so that the straw particles were heated in helium Cool to room temperature under ambient conditions to obtain a solid;

[0034] (4) The obtained solid is soaked with 1mol / L hydrochloric acid, and then washed several times with 75°C distilled water until the pH value of the final cleaning solution is neutral, and then the washed sol...

Embodiment 2

[0037] (1) Cut the collected wheat straw into 2-3mm straw particles, wash with water and 1mol / L hydrochloric acid, and then put it into a vacuum oven at 100°C for drying;

[0038] (2) Pack the pretreated and dried stalk particles into the quartz tube of the carbonization furnace, and before heating, feed helium to remove the air in the carbonization furnace, the gas flow rate is 150mL / min, and the duration is 30min;

[0039] (3) In an environment with an inert gas flow rate of 100mL / min, the temperature in the carbonization furnace was heated from room temperature to 450°C at a heating rate of 25°C / min for 1 min, and then the heating was stopped, so that the straw particles were heated in helium Cool to room temperature under ambient conditions to obtain a solid;

[0040] (4) The obtained solid is soaked with 1mol / L hydrochloric acid, and then washed several times with 75°C distilled water until the pH value of the final cleaning solution is neutral, and then the washed solid ...

Embodiment 3

[0043] (1) Cut the collected sweet potato stalks into straw particles of 2-3mm, wash with clear water and 1mol / L hydrochloric acid, and then put into a vacuum drying oven at 100°C for drying;

[0044] (2) Pack the pretreated and dried stalk particles into the quartz tube of the carbonization furnace, and before heating, feed helium to remove the air in the carbonization furnace, the gas flow rate is 250mL / min, and the duration is 45min;

[0045] (3) In an environment with an inert gas flow rate of 100mL / min, the temperature in the carbonization furnace was heated from room temperature to 500°C at a heating rate of 25°C / min for 3 minutes, and then the heating was stopped, so that the straw particles were heated in helium Cool to room temperature under ambient conditions to obtain a solid;

[0046] (4) The obtained solid is soaked with 1mol / L hydrochloric acid, and then washed several times with 75°C distilled water until the pH value of the final cleaning solution is neutral, a...

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Abstract

The invention relates to a method for preparing biomass carbon based on waste crop straw. The method comprises the following steps of: (1) cutting the crop straw into straw particles, washing and drying; (2) loading the processed straw particles in a quartz tube of a carbonizing furnace and introducing an inert gas; (3) heating to 350 to 550 DE C from room temperature in an environment with inert gas flow rate of 100mL / min at the heating rate of 25 DEG C / min, maintaining for 1 to 3 minutes, stopping heating, and cooling to the room temperature to obtain solid; and (4) washing and drying the solid obtained in the step (3) to obtain the biomass carbon. The device of the invention is simple in operation, the raw material has low cost and is readily available, and the method is suitable for large-scale industrial production; and the biomass carbon prepared by the method has a high specific area, can be used as a soil modifying agent to improve the fertility of the soil and can also be used as a soil repairing agent to repair the polluted soil, and has good application prospect.

Description

technical field [0001] The invention belongs to the field of biochar preparation, and in particular relates to a method for preparing biochar based on waste crop stalks. Background technique [0002] With the rapid development of the global industrial economy, a large amount of greenhouse gas emissions caused by human activities have led to global warming. How to deal with climate warming, a serious social and environmental problem, has become one of the important challenges facing the global society. . [0003] carbon dioxide (CO 2 ) is one of the components of the atmosphere and can strongly absorb infrared and near-infrared light, so it is considered to be one of the most important greenhouse gases that cause global warming. At present, how to efficiently and quickly reduce atmospheric CO 2 The emissions have become the focus of common attention and research hotspots of experts and scholars at home and abroad. [0004] Ocean water bodies are considered to be a huge ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02C10B57/08C10B57/10
CPCY02E50/14Y02E50/10
Inventor 刘保江高品刘路张士兵
Owner DONGHUA UNIV
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