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Additive for low-volatile coal and preparation method thereof

A technology with low volatile content and additives, which is applied in the field of resources and environment, can solve the problems of inconspicuous effect of combustion accelerant, unfavorable popularization and application, troublesome on-site operation, etc., and achieve the effect of abundant reserves, low price and low cost

Inactive Publication Date: 2010-12-01
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combustion enhancers are coal-fired additives that are widely used. Most of them use solid oxidant technologies such as potassium permanganate and sodium nitrate. The combustion-supporting purpose is achieved by generating oxygen in the boiler through coal combustion oxidants. The effect of the oxidizer to generate oxygen in the boiler to improve the combustion efficiency is not obvious
In addition, patents such as Chinese patent ZL90106347.9 and Chinese patent ZL981007116 disclose some coal-fired combustion-supporting agents. Although these combustion-supporting agents can improve the combustion situation, make the coal burn fully, and have good combustion-supporting effects, they all have high production costs and high combustion-supporting effects. time is short
Japanese patent 58-164696 discloses a kind of additive for low-quality coal, which is made by mixing silicon dioxide, iron oxide, sodium nitrate, diatomaceous earth and magnesium oxide, but this additive needs to be heated for a certain period of time in advance Can only be used, consume energy, troublesome on-site operation, not conducive to popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The oil shale is crushed to a particle size of less than 5mm (the oil yield of the oil shale is 7wt%); according to the percentage by weight of each raw material: oil shale 86%, sodium chloride 4%, potassium permanganate 5% , sodium nitrate 2%, potassium chlorate 3%, weigh each raw material; mix each weighed raw material evenly to obtain the additive for low volatile coal.

[0025] 80% (mass) of raw coal with a volatile content of 14.86% and 20% (mass) of this additive are evenly mixed and burned, and the volatile content of the combustion system is increased to 22.23%, which makes the coal easier to ignite, accelerates the combustion speed, and improves coal combustion efficiency.

Embodiment 2

[0027] Crushing the oil shale until the particle size is less than 5mm; according to the percentage by weight of each raw material: 88% of oil shale, 4% of sodium chloride, 3% of potassium permanganate, 2% of sodium nitrate, and 3% of potassium chlorate, weighed Raw materials; mixing the weighed raw materials uniformly to obtain the additive for low volatile coal. The oil yield of the oil shale used was 8 wt%.

[0028] 82% (mass) of raw coal with a volatile content of 13.75% and 18% (mass) of this additive are evenly mixed and burned, and the volatile content of the combustion system is increased to 20.20%, so that the coal is easier to ignite, and the combustion speed is accelerated. coal combustion efficiency.

Embodiment 3

[0030] Crushing the oil shale until the particle size is less than 5mm; according to the percentage by weight of each raw material: oil shale 90%, sodium chloride 3.5%, potassium permanganate 2.5%, sodium nitrate 1.5%, potassium chlorate 2.5%, weigh Raw materials; mixing the weighed raw materials uniformly to obtain the additive for low volatile coal. The oil yield of the oil shale used was 12 wt%.

[0031] 85% (mass) of raw coal with a volatile content of 13.83% and 15% (mass) of the additive are uniformly mixed and burned, and the volatile content of the combustion system is increased to 19.36%.

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Abstract

The invention belongs to the field of resources and environmental technologies, in particular to an additive for low-volatile coal and a preparation method thereof. The additive for the low-volatile coal is characterized by comprising the following raw materials by weight percentage: 86-92% of oil shale, 3-4% of sodium chloride, 2-5% of potassium permanganate, 1-2% of sodium nitrate and 2-3% of potassium chlorate. The invention can improve the combustion efficiency of the low-volatile coal and have simple process and low cost.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to an additive for low volatile coal and a preparation method thereof. Background technique [0002] China is the world's second largest energy consumer next to the United States, and is also the largest coal producer and consumer. It is estimated that China's total coal consumption in 2010 will be between 3.02 billion and 3.3 billion tons, accounting for about 30% of the global coal consumption growth. About 70%. It can be predicted that coal will occupy a very important position in my country's national economy for a long period of time in the future. [0003] The higher the volatile content of coal, the easier it is to catch fire, and the more heat it releases; after the volatile content is precipitated, the coal will become loose and have more pores, increasing the combustion surface area to accelerate the combustion process of coal, so that the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10
Inventor 蔡建严春杰王洪权余洪杰马睿
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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