Clean and efficient gradient screening internal thermal fluidized bed coal moisture control process

Abstract

The invention discloses a clean and efficient gradient screening internal thermal fluidized bed coal moisture control process.An internal thermal fluidized bed dryer serves as a main device; in the coal moisture control procedure, a coal particle diameter gradient screening procedure, a selective smashing procedure and a coal fly ash recovering and pelleting procedure are included; step-by-step screening of coal particle diameters is realized in the mode of mechanical screening through a low-temperature variable speed fluidized bed, orderly control over coal particle smashing and drying and coal dust is ensured, repeated processing of coal materials is reduced, and energy is reasonably input in the technological process.Air with strong moisture carrying capacity and high-temperature hot water with high thermal capacity are selected as a fluidizing medium and a heat transfer medium respectively according to the physical properties of the air and the high-temperature hot water.Compared with a traditional fluidized bed coal moisture control process, the functions of a heat carrier, a moisture carrier and the fluidizing medium in the coal moisture control process are separated, flexible control and precise processing can be achieved in terms of control and regulation, and the process is particularly suitable for moisture control over dryness of high-humidity coal materials.

Description

technical field [0001] The invention relates to the technical field of coking in the coking industry, in particular to a clean and efficient cascade screening built-in thermal fluidized bed coal humidity control process. Background technique [0002] Coal humidity control process (CMC) refers to the process of "moisture control of coal for coking and charging furnace". It is developed on the basis of dry coal coking technology. , dehydration, to achieve the adjustment and control of coal moisture. According to the current coking process requirements, the moisture in coal is controlled at about 6%, so as to reduce the energy consumption of the coking process, ensure the stability of the coke oven operation, improve the quality of coke or increase the weak The purpose of adding the amount of caking coal and reducing the amount of coking sewage. At the same time, the moisture content of the coking coal in the furnace is reduced, and the bulk density of the coal is increased, w...

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Problems solved by technology

[0004] In order to solve the problem of waste heat recovery and utilization of the current coke oven system and the clean discharge of pollutants, the present invention provides a clean and efficient cascade screening built-in thermal fluidized bed coal humidity control process, a coal blending process based on the existing coking coal Refine the coal preparation process according to the requirements and material characteristics. In the coal preparation process, the coal particle size step screening, selective crushing and coal fly ash recovery and granulation processes are embedded; the coal humidity control process uses a built-in thermal fluidized bed dryer. Mainly; the main heat source in the above process is coke oven flue gas with low-grade energy

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