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Binder-free high-strength fine coal briquetting method

A molding method and high-strength technology, applied in the petroleum industry, solid fuels, fuels, etc., can solve problems such as poor adaptability and strict requirements for pulverized coal, and achieve the effects of improving production efficiency, reducing costs, and avoiding drying and drying processes.

Active Publication Date: 2016-07-20
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a high-strength powdered coal molding method to solve the problems of strict requirements on coal powder and poor adaptability when molding without using a binder in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1), Xinjiang Hami coal is pulverized to coal powder with an average particle size of 29 μm, and sieved, wherein the content of coal powder with a particle size greater than 80 μm is 2.5 wt %; the content of coal powder with a particle size greater than 40 μm is 28 wt %;

[0042] (2), send the pulverized coal obtained in (1) into the feed bin of the briquette forming equipment, and carry out degassing treatment to the material in the feed bin, keep the negative pressure in the feed bin At 2.5kPa~3kPa;

[0043] (3) Keep the temperature of the material in the feeding bin at 50°C to 55°C, and adjust the moisture content to 7wt to 8wt%;

[0044] (4), the material in the feeding bin is sent into the molding equipment through the screw forced feeder for molding, and the linear pressure between the rollers is about 11-12t / cm during molding, so as to obtain the molding briquette (type coal).

[0045] Detect briquette strength, drum strength (GB / T7702.3-2008) 89.2%.

Embodiment 2

[0047] The difference from Example 1 is that the raw coal is a mixture of Xinjiang Hami coal and Heishan mining area longbituminous coal in a mass ratio of 1:1.

[0048] Detect the strength of the briquette, and the strength of the drum (GB / T7702.3-2008) is 91.4%.

Embodiment 3

[0050] (1) Mix Xinjiang Hami coal and Heishan mining area longbituminous coal uniformly at a mass ratio of 1:1, and crush to coal powder with an average particle size of 35 μm, and then sieve, wherein the content of coal powder with a particle size greater than 80 μm is 8.2 wt%; the content of pulverized coal with a particle size greater than 40 μm is 22wt%;

[0051] (2) Send the pulverized coal obtained in (1) into the mixing chamber for stirring and degassing. The top of the mixing chamber is equipped with an air extraction pipeline to make the density of the pulverized coal after stirring reach 0.60-0.65kg / L, and then pass through the star valve The pulverized coal in the mixing bin is sent to the feeding bin of the briquetting equipment.

[0052] (3) Carry out degassing treatment to the material in the feed bin, keep the negative pressure in the feed bin at 2.5kPa~3kPa;

[0053] (4), keeping the temperature of the material in the feeding bin at 80°C to 85°C, and adjusting...

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PUM

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Abstract

The invention discloses a high-strength fine coal briquetting method. The briquetting method comprises the following steps: a. pulverizing feed coal to obtain pulverized coal, wherein the average grain size of the pulverized coal is not less than 20mu m, the content of the pulverized coal with the grain size not more than 80mu m is not less than 90wt%, and the content of the pulverized coal with the grain size of 40-80mu m is not less than 10wt%; b. feeding the pulverized coal obtained in the step a into a feeding bin of briquetting equipment, and degassing the material in the feeding bin; c. adjusting the temperature of the material in the feeding bin to be 50-100 DEG C, and adjusting the moisture content of the material to be 2-8wt%; and d. feeding the material in the feeding bin into the briquetting equipment to be briquetted to obtain briquette. The briquetting method has the advantages that the briquetting method has wide adaptability to coal types; the feed coal is unnecessary to be pulverized into undersize grains; and the briquette product with strength more than 89% can be also prepared without adopting any binder even if the non-binding coal with the greatest briquetting difficulty is used as the feed coal.

Description

technical field [0001] The invention belongs to the field of pulverized coal processing and molding, in particular to a binder-free pulverized coal high-strength molding method. Background technique [0002] Since the industrial revolution, humans have used fossil energy on a large scale, which has had a huge and irreversible adverse impact on our ecological environment. Especially in the new century, the greenhouse effect is becoming increasingly severe, extreme weather emerges in endlessly, and environmental pollution continues to intensify. In this context, countries around the world generally adjust their energy policies and devote themselves to the development of environmentally friendly energy utilization methods. [0003] China's energy problem is even more serious. Although the total amount of energy is abundant, the per capita share is relatively low. China's per capita oil resources are only about 11% of the world average, natural gas is only about 5%, and coal r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/08
CPCC10L5/08C10L2290/28C10L2290/30C10L2290/32
Inventor 许新田赵龙王洪强陆晓东韩晓林张国辉刘晋冀漆涛吴亮亮李晋李建瑞许明喜鲁宗虎申明琪
Owner CHNA ENERGY INVESTMENT CORP LTD
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