A powdered coal forming, drying and dry distillation integrated molding coke process

Abstract

The present invention provides an integrated coke manufacturing process of pulverized coal forming, drying and retorting, including pulverized coal blending, molding, drying, retorting and coke quenching; 100 parts of bituminous coal powder, 0-300 parts of non-adhesive and / or weakly cohesive coal powder and / or 0-300 parts of coke powder; Preliminary drying at a temperature below 12%, such as 7-10%, and then deep drying at a temperature of 150-320°C, to reduce the moisture to below 2%. The treatment steps of preliminary drying and deep drying overcome the short board that the strength of the molding material is not high enough in some stages of the retort process, and reduce the deformation and powder loss of the molding material in the vertical retort furnace, so that the process can adopt 10m The vertical retort furnace with a material layer height of left and right can also use a vertical retort furnace with a material layer height of 15-30m.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical industry, and relates to an integrated molding coke manufacturing process of pulverized coal molding, drying and distillation. Background technique [0002] In the mechanized mining and washing process of coal mines, a large amount of pulverized coal will inevitably be produced; the production of molded coke through pulverized coal blending, molding, and dry distillation is an important way for the rational utilization of pulverized coal. The form coke has high carbon content and calorific value, has certain dimensions, strength and thermal stability, is convenient for storage, transportation and use, and its production cost and price are lower than those of coke and blue coke produced by dry distillation of lump coal. Carbon also has high specific resistance, fixed carbon content, chemical activity, high specific surface area, and low content of sulfur, phosphorus, ash, and volatile m...

AI Technical Summary

Problems solved by technology

[0003] At present, coal blending of molded coke usually uses coal powder plus 2-5% starch, or 5-15% tar and coal liquefaction residue. obtain and widely apply

[0004] Using cohesive bituminous coal powder, non-adhesive and / or weakly cohesive coal powder such as lignite powder and anthracite powder as coal blending raw materials for coke has advantages in terms of raw material cost and availability, There have been researches and applications on the production of molded coke through pulverized coal blending, molding, drying at a temperature below 150°C, and carbonization. However, there is a problem that the strength of the molding material in some stages of the carbonization process is not high enough, and it is only used for about 10m material layer. High vertical retort furnace, so the production capacity of a single furnace is not large, and it is difficult to exceed 100,000 tons / year. It is necessary to combine porous retort furnaces side by side to form a production scale of more than 1 million tons / year, so the investment and operation of retort furnaces The cost is high, and the process control of feeding and discharging materials, raw gas collection and temperature conditions of the retort furnace is relatively complicated, so that the process has not been widely used

If the molding material is used in a vertical retort furnace with a material bed height of about 30m, the deformation and powder loss will be large, and the deformation of the molding material will mainly cause the inconsistency of the air resistance of the material layer and the drop of the material layer, which improves the efficiency of the retort furnace. design requirements, investment costs, and difficulty in operation control; in addition to reducing the molded coke yield, the higher powder loss mainly makes it difficult to purify raw gas, which increases the design requirements and investment costs of the gas purification process.

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