Dry quenching cooled coal waste heat utilization-based coking coal fluidized drying grading technology

Abstract

The invention discloses a dry quenching cooled coke waste heat utilization-based coking coal fluidized drying grading technology. The technology comprises the following steps: crushing coking coal by a crusher, sent 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 coal particles into a coke oven, coking the coarse coal particles to obtain red coke, quenching the red coke by a dry quenching furnace to obtain cooled coke, sending the cooled coke into a heat exchanger, carrying out heat exchange cooling on the cooled coke and circulating smoke, and discharging the cooled coke from the bottom of the heat exchanger; and combusting the circulating smoke discharged from the upper portion of the heat exchanger through a detonation elimination combustor to consume oxygen and parts of coke dusts, sending the crushed coking coal into a fluidized bed drier to dry the crushed coking coal, allowing the dried crushed coking coal to enter a settlement chamber or a cyclone dust collector for dedusting and to enter a dehydrator for dehydration, sending the dedusted and dehydrated dried crushed coking coal into the heat exchanger, and exchanging heat with the cooled coke. The technology has the advantages of simplicity, effective recovery of low temperature waste heat of the coke, effective drying of the coking coal, great reduction of flue dust discharge, and environmental protection.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a coking coal fluidization drying and grading process based on the utilization of waste heat of CDQ cold coke. Background technique [0002] CDQ technology refers to a coke quenching method that uses inert gas to cool red coke: red coke is loaded from the top of the CDQ furnace, and low-temperature inert gas is blown into the CDQ furnace by a circulating fan to cool the red coke. The high-temperature inert gas that absorbs sensible heat is discharged from the bottom of the CDQ furnace, and the coarse powder coke is removed by dust removal once, and then enters the waste heat boiler for heat exchange, and the boiler generates steam for power generation. The cooled inert gas is subjected to secondary dust removal to remove fine particles of coke, then pressurized by a circulating fan, cooled to about 130°C by a feed water preheater, and then blown into the dry quenching furnac...

AI Technical Summary

Problems solved by technology

The moisture content of the incoming coal in most coking plants mainly depends on controlling the moisture content of the raw coal entering the plant, and through accumulation and mixing in the coal yard to form relatively stable coking coal moisture for coking into the furnace, there is almost no means of moisture control in the actual operation process

Moreover, in the coking coal drying process, if the coking coal is dried before crushing, although the amount of dust can be reduced, the drying effect is limited, and the moisture content of the coal can only be controlled at 7-8%; The coking coal will produce a lot of dust when it is dried (the lower the moisture content is controlled, the greater the amount of dust will be). These dusts are mixed with flue gas and then discharged after simple treatment, which has a serious impact on the environment and is the main cause of PM2.5. one of the contributors

[0005] Existing preheating, drying and dehumidification of coking coal not only utilizes part of the coke oven flue gas waste heat, but also requires supplementary fuel to provide hot flue gas. At the same time, the flue gas after drying coking coal is discharged to form a new emission source of particulate matter

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