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Predecomposition kiln by pass air relief and coal gangue dewatering technology

A technology of precalcining kiln and bypass ventilation, which is applied in the field of coal gangue dehydration process, and can solve the problems of clinker and cement quality decline, alkali-aggregate reaction, and deterioration of calcination conditions, etc.

Inactive Publication Date: 2006-01-11
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the rapid consumption of mineral resources used in cement production in my country, high-quality raw materials are decreasing day by day, and harmful elements such as alkali, chlorine, and sulfur in cement raw materials are continuously increasing, resulting in deteriorating calcination conditions in the kiln, and the quality of clinker and cement. decline, and even lead to the alkali-aggregate reaction of concrete, which leads to serious engineering accidents

Method used

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  • Predecomposition kiln by pass air relief and coal gangue dewatering technology
  • Predecomposition kiln by pass air relief and coal gangue dewatering technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1, such as figure 1 , the exhaust gas discharged from the primary cyclone separator 2 directly enters the quenching chamber, sprays water and mixes with cold air, and directly enters the electrostatic precipitator after lowering the temperature. The waste gas from the secondary and tertiary cyclone separators 3 and 4, that is, the coal gangue powder cooling system, has a temperature of about 150° C. and can be directly used for coal gangue grinding and drying.

Embodiment 2

[0017] Embodiment 2: as figure 2 , the waste gas discharged from the primary cyclone separator 2 is introduced into the humidification tower 7 for humidification, and after being collected by the electrostatic precipitator 8, it is discharged by the smoke exhaust fan 9 and the chimney 10.

Embodiment 3

[0018] Embodiment 3: as figure 2 , the exhaust gas discharged from the first-stage cyclone separator 2 directly enters the 14th to 15th-stage cyclone connecting pipe of the decomposition kiln, and then enters the preheater system of the precalciner kiln.

[0019] The present invention can also be used for precalcining the hot gas of the grate cooler of the kiln, and other hot gases can also be used.

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Abstract

A process for dewatering the coal gangue by the discharged hot fume of predecomposing kiln includes such steps as introducing said hot fume to preheating-dewatering pipe, introducing cold air for cooling it to proper temp, adding coal gangue powder, thermally converting the kaolin in coal gangue powder to metakaolin, stage-one cyclone separation for separating dewatered coal gangue powder from fume, cooling the powder, stage-two cyclone separation to obtain product, introducing the fume to moistening tower, moistening, electric dusting, and exhausting the air.

Description

technical field [0001] The invention relates to a coal gangue dehydration process, in particular to a precalcining kiln bypass venting and coal gangue dehydration process. Background technique [0002] The precalcining kiln is the most advanced cement calcining equipment in the world today, and it is also the leading kiln type that our country is currently focusing on developing. However, with the rapid consumption of mineral resources used in cement production in my country, high-quality raw materials are decreasing day by day, and harmful elements such as alkali, chlorine, and sulfur in cement raw materials are continuously increasing, resulting in deteriorating calcination conditions in the kiln, and the quality of clinker and cement. Decline, and even lead to the alkali-aggregate reaction of concrete, which leads to serious engineering accidents. On the other hand, because the cement industry is an industrial sector that consumes a lot of raw materials and energy, accord...

Claims

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Application Information

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IPC IPC(8): C04B7/40
Inventor 杨克锐张彩文
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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