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Process for preparing composite biomass briquettes

A composite briquette and production process technology, which is applied in the field of biomass composite briquette production technology, can solve problems such as poor strength, difficult ignition, black smoke, etc., and achieve the effects of low dust discharge, low cost and high sulfur fixation rate.

Inactive Publication Date: 2006-01-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The uninvented purpose is to process crop straw, forestry processing waste, municipal solid waste and coal into a compound briquette, improve the utilization rate of biomass waste, and reduce the impact of sulfur dioxide and nitrogen oxide on the environment caused by direct coal burning. At the same time, it solves the problems of poor strength of coal briquettes, difficulty in igniting, difficulty in burning out and black smoke.

Method used

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  • Process for preparing composite biomass briquettes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Proportion: 40% biomass + 60% lignite, adding CaO (Ca / S=1.0), Na 2 CO 3 (Na / Cl=1.0) and 0.1% Fe of the total fuel mass 2 o 3 ;

[0024] Molding pressure: 50Mpa; hot pressing temperature 140°C

[0025] Briquette size: diameter 35mm, length 30mm;

[0026] Combustion temperature: 850°C

[0027] 2) Implementation results

[0028] Briquette compressive strength > 20Mpa

[0029] Ignition point: 343°C, calorific value of composite briquette 20198.10Kj / kg;

[0030] Burnout rate = 96%, small thermal expansion during combustion, no automatic fragmentation during combustion, very little fly ash, and no black smoke;

[0031] The sulfur fixation rate is 76%, the chlorine fixation rate is 70%, and the nitrogen oxide emission concentration is less than 100mg.m -3 ;

Embodiment 2

[0033] 1) Implementation conditions

[0034] The characteristics of biomass fuel and lignite are the same as Example 1;

[0035] Proportion: 40% biomass + 60% lignite, reinforced sulfur agent CaO (Ca / S=2.0), 0.15% LSCF-8291, Na 2 CO 3 (Na / Cl=2.0);

[0036] Forming pressure: 50Mpa; hot pressing temperature 150°C

[0037] Briquette size: diameter 35mm, length 30mm;

[0038] Combustion temperature: 850°C;

[0039] 2) Implementation results

[0040] Briquette compressive strength> 20Mpa;

[0041] Ignition point: 332°C, calorific value of composite briquette 20250.06kJ / kg;

[0042] Burnout rate > 95%, ash is not broken, dust emission concentration -3 ;

[0043] Sulfur fixation rate = 87%, chlorine fixation rate 81%, nitrogen oxide emission -3 ;

Embodiment 3

[0045] 1) Implementation conditions

[0046] Proportion: 60% biomass + 40% lignite, adding composite sulfur fixative (CaO), carbide slag, iron series fossils, Ca / S≥1.5), Na 2 CO 3 (Na / Cl=2.0), 0.2% mixed combustion aid (Fe 2 o 3 ):LSCF-8291=1:1)

[0047] Molding pressure: 50Mpa; Molding temperature 150°C

[0048] Briquette size: diameter 35mm, length 30mm;

[0049] Combustion temperature: 850°C;

[0050] 2) Implementation results

[0051] Briquette compressive strength ≥ 22Mpa;

[0052] Ignition point = 320°C, calorific value 18811.87kJ / kg;

[0053] Burnout rate = 97%, dust emission concentration -3 , no obvious black smoke generation; sulfur fixation rate = 92%, chlorine fixation rate = 90%, nitrogen oxide emission does not exceed 90mg.m -3 .

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Abstract

A composite biomass briquette is made up of biomass including stalk or straw, wood leftover, city household garbage and raw coal through crushing, mixing with chlorine fixating agent, sulfur fixating agent and combustion promoter, and hot die pressing. Its advnatages are high compression strength, low combustion point, high combustion efficiency and less environmental pollution.

Description

1. Technical field: [0001] Biomass composite briquette production process is a process that combines agricultural crop straw, forestry processing waste, urban domestic garbage and coal into biomass briquette. 2. Background technology: [0002] Biomass is all renewable substances derived from plants, animals and microorganisms in organic matter except fossil fuels. The biomass resources on the earth are extremely rich. The dry matter produced by photosynthesis in the world is nearly 173 billion tons per year. The annual biomass output in my country is more than 5 billion tons of dry matter, which is equivalent to 2.5 times the total annual energy consumption. The annual stockpiling of garbage has reached 6 billion tons, and the annual output of garbage has exceeded 100 million tons, of which 37.5% is biomass energy that can be used as fuel. At present, the conversion and utilization rate of biomass energy in my country is less than 10%, and more than half of the nearly 700 mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L5/44
CPCY02E50/30Y02E50/10
Inventor 王华何方马文会姚刚包桂荣胡建杭
Owner KUNMING UNIV OF SCI & TECH
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