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Method for burning chromium salt calcium-free roasting coal powder

A combustion method, calcium-free roasting technology, applied in furnaces, gas emission reduction, lighting and heating equipment, etc., can solve problems such as long reaction time

Inactive Publication Date: 2009-06-03
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The reaction time of materials in chromium salt calcium-free roasting process is long, so the problem of the length of the high temperature zone must be solved when using pulverized coal as fuel

Method used

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  • Method for burning chromium salt calcium-free roasting coal powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The coal injection volume of the φ3×48m rotary kiln is adjusted to 1t / h, and the air volume of the coal injection fan is 5m 3 / min, the flow rate of the secondary air distribution fan is 15m 3 / min, the temperature of the high temperature zone of the rotary kiln is detected to be 1000°C, and the farthest point of the high temperature zone is away from the kiln mouth 11m， After roasting, the clinker contains 11.06% soluble hexavalent chromium, and the conversion rate is 70.2%.

Embodiment 2

[0026] The coal injection volume of the φ3×48m rotary kiln is adjusted to 1.5t / h, and the air volume of the coal injection fan is 5m 3 / min, the flow rate of the secondary air distribution fan is 15m 3 / min, the detected temperature in the high temperature zone of the rotary kiln is 1056°C, and the farthest point of the high temperature zone is 11.2m away from the kiln mouth. After roasting, the clinker contains 12.04% of soluble hexavalent chromium, and the conversion rate is 76.7%.

Embodiment 3

[0028] The coal injection volume of the φ3×48m rotary kiln is adjusted to 1.5t / h, and the air volume of the coal injection fan is 10m 3 / min, the flow rate of the secondary air distribution fan is 15m 3 / min, the detected temperature in the high temperature zone of the rotary kiln is 1080°C, and the farthest point of the high temperature zone is 13.5m away from the kiln mouth. After roasting, the clinker contains 12.87% of soluble hexavalent chromium, and the conversion rate is 77.4%.

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Abstract

The invention discloses a method for burning chromium salt calcium-free roasting coal powder. The invention adopts low sulfur coal as fuel and provides heat source to a rotary kiln through jet fire of a burner. The farthest point of the high temperature reaction zone of the rotary kiln has a distance of 11 to 19 m to the kiln port; and the burning temperature is 1,000 to 1,150 DEG C, which belongs to a strong oxidation atmosphere. The invention provides heat source to the chromium salt rotary kiln through the burning of the multi air ducts, which substitutes for light fuels such as heavy oil, liquefied gas, natural gas, etc. required to be adopted in chromium salt calcium-free roasting technology, so that the roasting cost reduced by 60% and the raw coal storage is safe, thereby specially suiting the use on any occasions. The technology is easy to improve and has remarkable effect, and can be widely applied to chromium salt production.

Description

technical field [0001] The invention relates to a chromium salt calcium-free roasting process, specifically a method of using coal as fuel. Background technique [0002] Roasting plays a very important role in the production process of chromium salts. The reaction of materials in the calcium-free roasting process of chromium salt industry is highly sensitive to silicon. In order to avoid the entry of silicon, light fuels are selected in various patent reports, such as heavy oil, Natural gas, liquefied petroleum gas. However, with the gradual escalation of the global oil supply crisis, the choice of high-value fuels will have a negative impact on the development of the chromium salt industry. Especially in my country, oil resources cannot be self-sufficient, and fluctuate greatly with the fluctuation of the international oil market. Therefore, choosing my country's relatively abundant coal resources as fuel for chromium salt calcium-free roasting has far-reaching significanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B7/34
CPCY02P10/143
Inventor 韩登仑张忠元张天任张红军何喜善杨昆山许延生张承国
Owner GANSU JINSHI CHEM
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