Method for preparing carbocoal by thermally cracking raw coal with external-heat horizontal rotary charring furnace

Abstract

The invention provides a method for preparing carbocoal by thermally cracking raw coal with an external-heat horizontal rotary charring furnace. The method comprises the following steps of: drying and desorbing the raw coal in a drying section of the rotary charring furnace at the temperature of between 100 and 300 DEG C; delivering the dried raw coal into a dry distillation section of the rotary charring furnace; thermally cracking the raw coal for 1 to 5 hours at the temperature of between 500 and 700 DEG C of materials; obtaining the carbocoal, tar and coal gas after the thermal cracking; allowing the generated carbocoal to pass through a coke quenching furnace and a coke sieving device to obtain a carbocoal finished product; and allowing the generated tar and coal gas to pass through a coal gas separating and purifying device to obtain a high-quality tar finished product and a high-calorific-value coal gas finished product. The method can reduce the granularity of the raw coal, improve the utilization rate of the raw coal, additionally improve the calorific value of the coal gas and greatly improve the utilization value of the coal gas. The method improves the quality of the carbocoal, saves energy resources and reduces harmful gas by adopting a dry coke quenching and continuous decoking method. The method has the advantages of single reactant in the technical process and no discharge of waste gas, waste water or waste residue, and belongs to a project of environmental protection.

Description

technical field [0001] The invention relates to a new process for industrialized production of blue charcoal - a process for preparing blue charcoal by thermally cracking raw coal in an externally heated horizontal rotary carbonization furnace, which belongs to the technical field of coal chemical industry. Background technique [0002] Blue charcoal, also known as semi-coke, is a kind of solid substance with high fixed carbon content produced by the Jurassic non-sticky weakly sticky coal as raw material and produced by medium and low temperature dry distillation process. Coke oven gas. Blue charcoal can be widely used in production and living fields such as calcium carbide, ferroalloy, chemical fertilizer gas production, blast furnace injection and clean coal for urban residents; tar has a wide range of uses and can be used to produce clean fuel oil. Important raw materials for organic chemicals such as pesticides, medicines, and high temperature resistant materials; coke ...

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Problems solved by technology

[0004] The disadvantages of the above method are: when the dry distillation is burned, the heat used in the dry distillation is mainly mixed with the returned furnace gas and air in the fire channel, and then blown into the dry distillation section by the blower through the burner for combustion. Therefore, the particle size of the raw coal required by it is relatively large , the requirement is 20-80mm. In actual coal mine production, such lump coal is only 30% to 40%, and there is a shortage of raw materials; due to the use of internal heat dry distillation, the furnace contains a large amount of air, so the generated gas has a low calorific value. The content of hydrogen and methane is low, and the content of nitrogen is too high, which cannot meet the requirements of chemical industry utilization. It can only be used as fuel instead of chemical raw materials; its tar recovery rate is low; Coke consumes a part of the latent heat of semi-coke, which affects the quality of semi-coke, and the product has a high water content, which limits the use of semi-coke and increases transportation costs.

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