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Forming method for modifying biomass fuel by rapid thermal treatment process

A technology of rapid heat treatment and biomass fuel, applied in the direction of biofuel, waste fuel, fuel, etc., can solve the problems of high cost of biomass briquette fuel, high energy consumption, high energy consumption of crushing, and achieve the suppression of liquid by-products and associated gas Formation, reduction of crushing and molding energy consumption, and improvement of hydrophobic performance

Inactive Publication Date: 2011-04-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the unique fiber structure of biomass leads to difficulties in continuous feeding and high energy consumption for crushing; biomass raw materials have low density and no cohesion, and are usually accompanied by elastic deformation, surface destruction and plastic deformation of the original particles during the pressing process. This process consumes a lot of energy; the variety of biomass raw materials and water content varies widely, resulting in difficulty in molding and variable fuel quality, and large fluctuations in fuel ignition and combustion performance
These factors lead to high cost of biomass briquettes, making it difficult to promote on a large scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Naturally dried and unbroken rice husks are used as raw materials, and their moisture content is about 9.8%. A rapid thermal modification treatment device is used for rapid heat treatment at 320°C and nitrogen atmosphere for 2s, and the heating rate of heat treatment is 800°C. / s, the yields of thermally modified rice husk, liquid and associated gas were 90%, 6% and 4%, respectively.

[0018] The thermally modified rice husk obtained in the experiment is crushed to a particle size of 30mm, the crushed rice husk is mixed with the liquid product and fully stirred evenly; the above-mentioned mixed material is sent to a stamping molding machine and pressed at room temperature with a pressure of 60MPa to form a diameter Cylindrical biomass briquettes with 25mm and 30mm length.

Embodiment 2

[0020] Naturally dried wheat stalks are used as raw materials with a moisture content of about 10.5%. After simple shearing treatment, the height of the particles is about 5 cm; a rapid thermal modification treatment device is used to heat them at 360 °C in an inert gas atmosphere (with Associated gas was used as a protective gas) for rapid heat treatment for 1 s, and the heating rate of heat treatment was 1200 °C / s. The yields of thermally modified wheat straw, liquid and associated gas were 91%, 5% and 4%, respectively.

[0021] The thermally modified wheat straw obtained in the experiment was crushed to a particle size of 40mm, and the crushed wheat straw was mixed with the liquid product and fully stirred evenly; the above-mentioned mixed material was sent to a stamping molding machine and pressed at room temperature with a pressure of 30MPa to form an edge A cuboid biomass briquette with a length of 25×40×100 mm.

Embodiment 3

[0023] Naturally dried cotton stalks are used as raw materials with a moisture content of about 11.3%. After simple shearing treatment, the height of the particles is about 4 cm; using a rapid thermal modification device to heat them at 350°C in an inert gas atmosphere (with Associated gas was used as a protective gas) for rapid heat treatment for 0.5s, and the heating rate of heat treatment was 700°C / s, and the yields of thermally modified cotton stalks, liquid and associated gas were 95%, 3% and 2%, respectively.

[0024] The thermally modified cotton stalks obtained in the experiment were crushed to a particle size of 50 mm, and the crushed cotton stalks were mixed with liquid products and a certain amount of clay (the ratio of thermally modified cotton stalks, liquid by-products, and clay was 95:3:3) Mix and fully stir evenly; send the above-mentioned mixed materials into a stamping molding machine and press at room temperature with a pressure of 30MPa to form a cylindrical...

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Abstract

The invention discloses a forming method for modifying biomass fuel by a rapid thermal treatment process in the technical field of biomass fuel preparation. The preparation method of the forming fuel comprises the following steps: crushing biomass material into particles of which the diameter is less than 1 cm; performing rapid thermal treatment in a condition of limited oxygen supply or without oxygen, and collecting and obtaining thermo-modified biomass; crushing the obtained thermo-modified biomass; and adding binder and mixing in a forming machine to prepare the forming fuel. Through the method disclosed by the invention, the fiber structure of the biomass raw material can be damaged, and the flexibility is reduced so that the biomass raw material is easier to crush and grind; thus, the crushing and forming power consumption is obviously reduced, and the heat value and stability of the forming fuel are remarkably improved; moreover, as the liquid byproduct is used as the binder, heating is not required in the forming agglomeration process, the abrasion of the mechanical equipment is reduced, the durability of the forming fuel is improved, and the preparation cost is effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of biomass fuel preparation, in particular to a molding method for modifying biomass fuel by using a rapid heat treatment process. Background technique [0002] Biomass fuel molding is to compress biomass waste such as straw, rice husk, wood chips, etc. by mechanical pressure, so that the original loose and amorphous raw materials are compressed into a solid molding fuel with a certain shape and high density. Compressed biomass briquettes have the advantages of small size, high density, convenient storage and transportation, high calorific value, and stable combustion. However, the unique fiber structure of biomass leads to difficulties in continuous feeding and high energy consumption for crushing; biomass raw materials have low density and no cohesion, and are usually accompanied by elastic deformation, surface destruction and plastic deformation of the original particles during the pressing process. This...

Claims

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Application Information

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IPC IPC(8): C10L5/44
CPCY02E50/30Y02E50/10
Inventor 董长青陆强张俊姣杨晓初陶君杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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