Coal low-temperature carbonization system and method

A low-temperature, dry distillation technology, applied in the field of dry distillation, to achieve the effect of shortening the residence time, reducing the secondary cracking reaction, and reducing the difficulty of type selection

Active Publication Date: 2014-12-03
SHENWU TECH GRP CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to solve some problems existing in the existing coal low-temperature carbonization technology, and to provide a coal low-temperature carbonization system and method

Method used

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  • Coal low-temperature carbonization system and method

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Embodiment

[0034] The rotary bed retort unit adopts the isolated flue gas radiant tube to heat the rotary bed retort furnace, with a processing scale of 1 million tons per year, taking the pyrolysis of long-flame coal as an example.

[0035] (1) The crushed raw coal enters the rotary bed carbonization unit. The carbonization conditions are final temperature of 650°C, cloth thickness of 180mm, reaction time of one revolution of 90min, semi-coke at 650°C from the side of the furnace, and oil gas at 650°C from the top of the furnace , 351,000 tons / year of high-temperature oil, gas and water are produced from the top of the furnace.

[0036] (2) The extracted high-temperature oil, gas, and water go through the gas washing and tar capture unit to purify the gas and collect the tar. The temperature of the gas and tar drops to 30°C. The circulating clean gas is introduced into the gas CDQ unit through the convection fan, as As the cooling medium of semi-coke, the collected tar and clean gas are...

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Abstract

The invention provides a coal low-temperature carbonization system and method. The system comprises a revolving bed carbonization unit, a raw gas washing unit, a tar trapping unit, a gas convection unit and a gas dry quenching unit, wherein the revolving bed carbonization unit is sequentially connected with the raw gas washing unit, tar trapping unit, gas convection unit and gas dry quenching unit. The system and method shorten the oil-gas retention time in the furnace, reduce the secondary cracking reaction and enhance the tar yield.

Description

technical field [0001] The invention relates to dry distillation technology, in particular to a low-temperature dry distillation technology of coal. Background technique [0002] At present, coal dry distillation refers to the process in which coal is heated under air-isolated conditions and thermally decomposed to produce coke (semi-coke), coal tar, gas and pyrolysis water. The low-temperature dry distillation of coal refers to the pyrolysis reaction of coal at a lower heating final temperature. It is generally believed that the final temperature of low-temperature dry distillation is 500-700°C. [0003] The low-temperature dry distillation of coal is divided into internal heat type and external heat type according to the heating method. Most of the traditional carbonization furnaces are externally heated. The thermal efficiency of the externally heated carbonization furnace is low, the material is heated unevenly, and the secondary cracking of volatile products is very se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C10B53/04
Inventor 吴道洪郭启海丁力
Owner SHENWU TECH GRP CO LTD
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