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A kind of method for reducing the acid value of biomass molding fuel pyrolysis tar

A briquette fuel and biomass technology, which is applied in the field of pyrolysis of biomass briquette fuel, can solve problems such as unsuitable fuel use, and achieve the effects of promoting efficient utilization, convenient production, and high calorific value

Inactive Publication Date: 2018-12-14
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The calorific value of tar is only 24.68kJ·g -1 About, and coal tar (35.7 ~ 39kJ g -1 ) is much smaller than that, not suitable for direct use as fuel

Method used

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  • A kind of method for reducing the acid value of biomass molding fuel pyrolysis tar
  • A kind of method for reducing the acid value of biomass molding fuel pyrolysis tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The invention relates to a pyrolysis method of biomass briquette fuel, which is suitable for the production process of preparing briquette charcoal by pyrolyzing stick-shaped fuel made of pine wood chips, fir wood chips and hard miscellaneous wood chips as raw materials under oxygen-containing ambient conditions. Process using mixed pyrolysis medium (air+carbon dioxide) (V co2 :V 空气 =(1-3):100), to pyrolyze the biomass briquette fuel, the final pyrolysis temperature is 600-850°C, the slow pyrolysis process is adopted, and the heating rate is controlled to be 5-15°C / hour. This pyrolysis method can significantly change the composition of biomass briquette pyrolysis tar, in which the acid value is greater than 70 mg KOH g- 1 Reduced to 20-30mg KOH·g- 1 , the calorific value of pyrolysis tar is changed from 25kJ·g -1 Increased to 28-32kJ·g -1 , significantly reducing the corrosiveness of biomass briquette fuel pyrolysis tar and correspondingly increasing the calorific v...

Embodiment 2

[0016] The invention relates to a pyrolysis method of biomass briquette fuel, which is suitable for the production process of preparing briquette charcoal by pyrolyzing stick-shaped fuel made of pine wood chips, fir wood chips and hard miscellaneous wood chips as raw materials under oxygen-containing ambient conditions. The process of using mixed pyrolysis medium (air + carbon dioxide) in the production process (V co2 :V 空气 =1:100), to pyrolyze the biomass briquette fuel, the final pyrolysis temperature is 600°C, the slow pyrolysis process is adopted, and the heating rate is controlled to be 5°C / hour. This pyrolysis method can significantly change the composition of biomass briquette pyrolysis tar, in which the acid value is greater than 70 mg KOH g- 1 reduced to 20mg KOH·g- 1 , the calorific value of pyrolysis tar is changed from 25kJ·g -1 Increased to 28kJ·g -1 .

Embodiment 3

[0018] The invention relates to a pyrolysis method of biomass briquette fuel, which is suitable for the production process of preparing briquette charcoal by pyrolyzing stick-shaped fuel made of pine wood chips, fir wood chips and hard miscellaneous wood chips as raw materials under oxygen-containing ambient conditions. Process using mixed pyrolysis medium (air+carbon dioxide) (V co2 :V 空气 =3:100), to pyrolyze the biomass briquette fuel, the final pyrolysis temperature is 850°C, the slow pyrolysis process is adopted, and the heating rate is controlled to be 15°C / hour. This pyrolysis method can significantly change the composition of biomass briquette fuel pyrolysis tar, wherein the acid value is greater than 70mgKOH g- 1 reduced to 30mg KOH g- 1 , the calorific value of pyrolysis tar is changed from 25kJ·g -1 Increased to 32kJ·g -1 .

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Abstract

The invention discloses a method for reducing the acid value of biomass briquette pyrolysis tar, which is suitable for the production technology for pyrolyzing rod-like fuel prepared by pressing the raw materials, namely pine sawdust, China fir sawdust and hardwood sawdust in an oxygen-containing environment to prepare moulding charcoal. By adopting a technology of mixing pyrolysis media air and carbon dioxide in which the volume ratio of the CO2 to air is (1-3):100, the biomass briquette is pyrolyzed, and the final pyrolysis temperature is 600-850 DEG C; and a slow pyrolysis technology is adopted, and the heating rate is controlled to 5-15 DEG C per hour. Through the pyrolysis method, the composition of the biomass briquette pyrolysis tar obviously changes, wherein the acid value is reduced from over 70mg KOH / g to (20-30)mg KOH / g, and the heat value of the pyrolysis tar is increased from 25 kJ / g to (28-32) kJ / g; and the corrosivity of the biomass briquette pyrolysis tar is obviously reduced while the heat value of the pyrolysis tar is correspondingly increased.

Description

technical field [0001] The invention relates to a pyrolysis method of biomass briquette fuel, in particular to a pyrolysis method for preparing briquette charcoal by pyrolyzing rod-shaped fuel made of pine wood chips, Chinese fir wood chips and hard miscellaneous wood chips as raw materials under oxygen-containing ambient conditions craft. Background technique [0002] my country has abundant biomass resources, and the annual output of solid briquette fuel made from wood chips is about 150,000 tons. It can be further pyrolyzed to produce briquette briquettes, and the resulting tar by-products are about 50,000 tons per year. Ten thousand tons, biomass briquette fuel pyrolysis tar is a kind of black viscous liquid containing complex organic compounds, the development and utilization of tar by-products in the process of briquette carbon preparation is a good thing to turn waste into treasure. At present, the conventional process for preparing shaped carbon (only using hot air a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L5/44C10B53/02C10B49/00
CPCC10B49/00C10B53/02C10L5/442C10L2290/02Y02E50/10Y02E50/30
Inventor 刘石彩黄丽杨华邓先伦蒋剑春
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY