Fluorine capturing fuel with enwrapped stone coal as main material and its production method

Abstract

The invention discloses a fluorine capturing fuel with enwrapped stone coal as main material and its production method, wherein cured and burned dolomitite or burned limestone, anthracite duff and clay are mixed by a finite proportion and coated outside the stone coal, and the end product through further airing. The invention realizes high fluorine-fixing rate, sulfur-eliminating ratio and dust-depositing rate, the problem of air pollution of vast amount of fluoride and sulphide produced by stone coal combustion is solved substantially.

Description

technical field

[0001] The invention relates to a combined fuel and a preparation method thereof, in particular to a combined fuel with fluorine-fixing performance and a preparation method thereof. Background technique

[0002] The flue gas produced by the combustion of high-fluorine coal is the main source of air fluorine pollution. Controlled by geological strata, the fluorine content of high-fluorine coal in my country generally ranges from 100 to 300 mg / kg, with an average fluorine content of 200 mg / kg. This value is much higher than the world average of 80mg / kg. Especially in some Permian coal-measure strata and Cambrian and Silurian coal-measure strata, the fluorine content of coal is even as high as 1000-3000mg / kg. At present, there are quite a few power plants in my country that use high-fluorine coal as fuel. Therefore, in the process of coal mining, processing and utilization, fluorine in coal diffuses into the atmosphere, water and soil in the form of gaseous, ...

Examples

Embodiment 1

[0043] Weigh 83% of the southern Shaanxi stone coal and lay it flat on the cement floor or iron plate, evenly sprinkle 7% of anthracite powder, 6% of No. 1 slaked lime and 4% of clay on it, stir evenly, and sprinkle a small amount of water to make Anthracite coal powder, slaked lime and clay are evenly wrapped on the stone coal block and dried in the air. Select 16 local households with the same ground furnaces, of which 8 households burn the fluorine-fixed fuel treated by the above method, and 8 households burn untreated stone coal. Collect unburned coal and slag after combustion, measure the fluorine content of each household, and calculate the fluorine fixation rate to be 75.0% (see Table 1). Then collect the fluorine content of the air in the two groups of ground furnace rooms respectively, and the fluorine content of the air in the burning fluorine fuel is 0.04625±0.02878mg / m 3 , those who burn untreated stone coal 0.324±0.2591mg / m 3 , The average fluoride removal rate ...

Embodiment 2-17

[0051] Take stone coal block, anthracite powder, matured dolomite or lime and clay according to the proportion of each component in Table 5, stir evenly, sprinkle a small amount of water, make anthracite powder, matured dolomite or lime and The clay is evenly wrapped on the stone coal block and dried in the air. Take part of it and pulverize it, wherein the fluorine is measured by the above-mentioned method for measuring fluorine in fluorine-fixed fuel; part of it is measured by the above-mentioned method for measuring fluorine released by the above-mentioned fluorine-fixed fuel simulating the combustion temperature of a stone coal furnace.

[0052]

technical field

[0001] The invention relates to a combined fuel and a preparation method thereof, in particular to a combined fuel with fluorine-fixing performance and a preparation method thereof. Background technique

[0002] The flue gas produced by the combustion of high-fluorine coal is the main source of air fluorine pollution. Controlled by geological strata, the fluorine content of high-fluorine coal in my country generally ranges from 100 to 300 mg / kg, with an average fluorine content of 200 mg / kg. This value is much higher than the world average of 80mg / kg. Especially in some Permian coal-measure strata and Cambrian and Silurian coal-measure strata, the fluorine content of coal is even as high as 1000-3000mg / kg. At present, there are quite a few power plants in my country that use high-fluorine coal as fuel. Therefore, in the process of coal mining, processing and utilization, fluorine in coal diffuses into the atmosphere, water and soil in the form of gaseous, ...

Examples

Embodiment 1

[0043] Weigh 83% of the southern Shaanxi stone coal and lay it flat on the cement floor or iron plate, evenly sprinkle 7% of anthracite powder, 6% of No. 1 slaked lime and 4% of clay on it, stir evenly, and sprinkle a small amount of water to make Anthracite coal powder, slaked lime and clay are evenly wrapped on the stone coal block and dried in the air. Select 16 local households with the same ground furnaces, of which 8 households burn the fluorine-fixed fuel treated by the above method, and 8 households burn untreated stone coal. Collect unburned coal and slag after combustion, measure the fluorine content of each household, and calculate the fluorine fixation rate to be 75.0% (see Table 1). Then collect the fluorine content of the air in the two groups of ground furnace rooms respectively, and the fluorine content of the air in the burning fluorine fuel is 0.04625±0.02878mg / m 3 , those who burn untreated stone coal 0.324±0.2591mg / m 3 , The average fluoride removal rate ...

Embodiment 2-17

[0051] Take stone coal block, anthracite powder, matured dolomite or lime and clay according to the proportion of each component in Table 5, stir evenly, sprinkle a small amount of water, make anthracite powder, matured dolomite or lime and The clay is evenly wrapped on the stone coal block and dried in the air. Take part of it and pulverize it, wherein the fluorine is measured by the above-mentioned method for measuring fluorine in fluorine-fixed fuel; part of it is measured by the above-mentioned method for measuring fluorine released by the above-mentioned fluorine-fixed fuel simulating the combustion temperature of a stone coal furnace.

[0052]

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