Dry quenching process based on water gas preparation and circulation

Abstract

The invention discloses a dry quenching technology based on water gas preparation and cycle. The technology comprises the following steps: crushing coking coal, sending the crushed coking coal into a fluidized bed, fluidizing, drying and grading the crushed coking coal, separating coarse coal particles and fine coal powder, sending the coarse coke particles to a coke oven, coking the coarse coke particles to form red coke, cooling the red coke through a dry quenching furnace to obtain cooled coke, sending the cooled coke into a coke-wet coal rotary kiln, carrying out mixing and heat exchange on the cooled coke and coking coal, crushing the coking coal, sending the cooled coal discharged from the rotary kiln and the crushed coking coal into a coal-coke separation screen, separating the coke, crushing the separated coke coal, and sending the crushed coke coal and the coke powder into the fluidized bed. The technology has the advantages of simplicity, effective recovery of waste heat, effective drying of the coking coal, prolongation of the service life of devices, great reduction of flue dust discharge, environmental protection and obtaining of gas as a byproduct.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a coke dry quenching process based on water gas preparation and circulation. Background technique [0002] Dry quenching refers to a coke quenching method that uses inert gas to cool red coke. In the CDQ process, red coke is loaded from the top of the CDQ furnace, and the low-temperature inert gas is blown into the red coke layer in the cooling section of the CDQ furnace by a circulating fan to absorb the sensible heat of the red coke, and the cooled coke is discharged from the bottom of the CDQ furnace. Exhaust, the high-temperature inert gas from the annular flue of the CDQ furnace flows through the CDQ boiler for heat exchange, the boiler generates steam, and the cooled inert gas is re-blown into the CDQ furnace by the circulating fan, and the inert gas is in a closed system recycle. CDQ can improve coke strength and reduce coke reactivity, which is beneficial to blast ...

AI Technical Summary

Problems solved by technology

In addition, the residual volatile matter of coke is always precipitated, and the H produced by pyrolysis of coke 2 , CO, CH 4 etc. are also flammable and explosive components. These flammable components will be added to the circulating inert gas, and will be partially discharged with the inert gas on a regular basis. This discharge behavior is not only a waste of energy, but also a source of pollution;

[0006] (3) The leakage of the waste heat boiler leads to the increase of moisture in the circulating gas, and the water gas generated by the water vapor in the high-temperature area of ​​the coke layer is burned and discharged, which further leads to energy waste;

[0007] (4) Furnace top coke charging flue gas has a large dust content and high temperature, and the sensible heat carried by the flue dust cannot be effectively recycled

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