Fluoride-fixing fuel and its production process

Abstract

The fluoride-fixing fuel include the following components: fluoride-fixing additive and common coal, and the fluoride-fixing additive is baked dolomite. The weight ratio between the baked dolomite and common coal is 5-50 %. The present invention solves the environmental pollution problem of burning coal to release great amount of fluoride polluting environment and the problem of available stove with incomplete fluoride elimination and provides one new fluoride-fixing way. The said fluoride-fixing fuel has excellent effect of reducing environmental pollution caused by coal burning, and may be used widely in industrial and domestic stoves burning fluoride-containing fuel.

Description

technical field

[0001] The invention relates to a combined fuel and its preparation method, more specifically, the invention relates to a combined fuel with fluorine-fixing performance and its preparation method. 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 fo...

Examples

Embodiment 1

[0029] Weigh 0.2g of coal sample (accurate to 0.0001g) and a certain amount of fluorine-fixing agent and 0.1g of SiO 2 Put the powder in a porcelain boat and mix well. Use a 15mL absorption tube filled with 0.2mol / L sodium hydroxide solution to receive the condensate. Push the front end of the porcelain boat to the low temperature zone (about 600°C) and stay there for 5 minutes to gradually burn the sample completely. Then, push the porcelain boat to a high temperature constant temperature zone (1000°C) and keep it for 10 minutes. Then, remove the absorption tube, take out the porcelain boat, add two drops of phenolphthalein to the absorption tube, neutralize it with 2mol / L nitric acid until neutral, add 10ml of buffer solution, dilute to 50mL with water, shake well, and measure with an ion selective electrode. Fluorine content.

Embodiment 2-29

[0031] The experimental conditions of Examples 2-29 are the same as those of Example 1 except that the proportions of coal samples, fluorine-fixing agent and coal are different. The measured fluorine fixation rate is listed in Table 1.

[0032] Wherein: among Examples 1-14, Examples 1-7 are actually comparative examples; among Examples 15-20, Examples 15-17 are actually comparative examples.

[0033] See Table 1 on next page.

[0034]

technical field

[0001] The invention relates to a combined fuel and its preparation method, more specifically, the invention relates to a combined fuel with fluorine-fixing performance and its preparation method. 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 fo...

Examples

Embodiment 1

[0029] Weigh 0.2g of coal sample (accurate to 0.0001g) and a certain amount of fluorine-fixing agent and 0.1g of SiO 2 Put the powder in a porcelain boat and mix well. Use a 15mL absorption tube filled with 0.2mol / L sodium hydroxide solution to receive the condensate. Push the front end of the porcelain boat to the low temperature zone (about 600°C) and stay there for 5 minutes to gradually burn the sample completely. Then, push the porcelain boat to a high temperature constant temperature zone (1000°C) and keep it for 10 minutes. Then, remove the absorption tube, take out the porcelain boat, add two drops of phenolphthalein to the absorption tube, neutralize it with 2mol / L nitric acid until neutral, add 10ml of buffer solution, dilute to 50mL with water, shake well, and measure with an ion selective electrode. Fluorine content.

Embodiment 2-29

[0031] The experimental conditions of Examples 2-29 are the same as those of Example 1 except that the proportions of coal samples, fluorine-fixing agent and coal are different. The measured fluorine fixation rate is listed in Table 1.

[0032] Wherein: among Examples 1-14, Examples 1-7 are actually comparative examples; among Examples 15-20, Examples 15-17 are actually comparative examples.

[0033] See Table 1 on next page.

[0034]