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Method for making biomass waste carbonization environmental-friendly briquette coal

A technology of biomass and biomass pyrolysis, which is applied in the field of preparation of environmentally friendly briquettes from biomass waste carbonization, can solve problems such as low energy density, environmental pollution, energy waste, etc., achieve high energy recovery rate and reduce production costs , Good combustion effect

Pending Publication Date: 2019-04-26
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The ineffective use of biomass waste has caused serious energy waste and environmental pollution. Large-scale direct combustion also has problems such as high impurities and low energy density. At the same time, the volatile content of biomass is high, and low-temperature carbonization can effectively improve the thermochemistry of biomass. Performance, improve biomass energy density and energy yield

Method used

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  • Method for making biomass waste carbonization environmental-friendly briquette coal

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preparation example Construction

[0025] Such as figure 1 Shown, the preparation method of biomass carbonization system environment-friendly briquette of the present invention, its steps are:

[0026] a. The raw coal is crushed, screened and graded appropriately. According to the needs, the raw coal used includes low-rank coal, coal slime or high ash coal or mixed with each other. The reversible impact hammer crusher is used to crush and grind at both ends. The process crushes the raw coal to obtain raw coal particles with a particle size of less than 5 mm;

[0027] b. Feed the collected raw coal particles with a diameter of less than 5mm into the raw coal pyrolysis furnace and fill it with inert gas. The raw coal pyrolysis furnace generates a section of heat energy for low-temperature pyrolysis of the raw coal particles. The first section of heat energy is 400-600°C, Raw coal particles are thermally decomposed and converted into volatile gas components, carbonized components and tar components, the volatile ...

example 1

[0035] Example 1: After the crops are harvested, the crop stalks in the field are collected by a baler, and the collected stalks are separated by gravity and magnetic force to remove impurities such as iron and stones. After drying to a suitable moisture content at ℃, it is broken to less than 7mm. The crushed biomass that meets the particle size requirements is pyrolyzed in a nitrogen atmosphere at a temperature of 250-280°C, and the residence time is 20-30min. The low-rank coal is crushed by a reversible hammer crusher and then sieved by a vibrating screen and moderately graded. The graded raw coal is pyrolyzed in a nitrogen atmosphere at 420-540°C with a residence time of 30-40min. The volatile substances produced in the pyrolysis carbonization are collected as raw materials, and the oil can be used for forming and bonding. The carbonized coal and biomass are added to the mixing material stirring device at a mass ratio of 7:3-9:1, and mixed with the material The proportion...

example 2

[0036]Example 2: Remove impurities such as iron and stones by gravity and magnetic separation of wood scraps, and the straw after removal is dried to a suitable moisture content in three stages of low-temperature airflow at 100-120°C and then crushed to less than 5mm . The crushed biomass that meets the particle size requirements is pyrolyzed by heating the second-stage airflow after the pyrolysis coal to a temperature of 280-320°C in a nitrogen atmosphere, and the residence time is 20-30min. The low-rank coal is crushed by a reversible hammer crusher and screened by a vibrating screen. The raw coal is crushed by a reversible hammer crusher and screened by a vibrating screen with 2mm, 1mm, 0.5mm sieve plates and collected -0.5mm, 0.5- Coal with three particle sizes of 1mm and 1-2mm completes the gradation. The graded low-rank coal is pyrolyzed in a nitrogen atmosphere at 400-500°C, with a residence time of 30-40min. The volatile substances produced in the pyrolysis carboniza...

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Abstract

The invention relates to a method for making biomass waste carbonization environmental-friendly briquette coal and is applicable to the field of environment protection. The method comprises the following steps: picking and collecting biomass raw materials; carrying out sorting and decontamination on the biomass raw materials; drying the biomass raw materials; crushing and screening the biomass rawmaterials; carrying out low temperature pyrolysis on the biomass raw materials; crushing and screening crude coal; grading the crude coal; carrying out low temperature pyrolysis on the crude coal; mixing the raw materials; carrying out wheel grinding and pre-pressing; molding briquette coal; recycling waste materials; carrying out drying and packaging. The method can be applied to biomass collection and carbonization and coal molding to make environmental-friendly briquette coal on scale, the briquette coal has less impurities, heat can be utilized at multiple stages, volatile components andimmobilized carbon of the raw materials can be sufficiently utilized, environmental-friendly briquette coal which is good in combustion activity and small in pollutant emission can be made, and technical support is provided for effective utilization of biomass wastes and on-scale operation of environmental-friendly briquette coal making.

Description

technical field [0001] The invention relates to a method for preparing environmentally friendly briquettes, and is particularly suitable for a method for preparing environmentally friendly briquettes by carbonizing biomass waste used in the field of environmental protection. Background technique [0002] With the continuous maturity and development of coal and biomass co-combustion technology, the advantages of co-combustion such as improved energy utilization, good combustion performance and reduced pollutants have been reflected. However, the current co-combustion technology is only used in boilers, the mixing effect is not ideal, and the advantages of co-combustion cannot be fully reflected. Therefore, it is of great significance to develop a solid mixed fuel that has good molding effect, good environmental performance, and can meet different combustion environments. The development of biomass and coal mixed solid fuel can effectively use biomass energy to replace fossil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/04C10L5/10C10L5/44
CPCC10L5/04C10L5/10C10L5/44Y02E50/10Y02E50/30
Inventor 桂夏辉张鹏德
Owner CHINA UNIV OF MINING & TECH
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