System and method for clearing graphite on coke oven riser tube and recovering residual heat of raw coke oven gas

Abstract

The invention discloses a system and a method for clearing graphite on a coke oven riser tube and recovering residual heat of raw coke oven gas, and belongs to the technical field of industrial residual heat recovery. The system comprises a riser tube root heat exchange device, a residual heat recovery device, a rotary turbulence scraper and a transmission device, wherein the riser tube root heat exchange device comprises an outer barrel and a heat exchanger; the outer barrel and the outer wall of a raw coke oven gas channel on the root part of the riser tube form an annular space; the heat exchanger is positioned in the annular space; the outer barrel is provided with a working medium outlet; the outlet of the heat exchanger is connected with the residual heat recovery device; after the heat exchanger cools the raw coke oven gas, the working medium is conveyed to the residual heat recovery device; the rotary turbulence scraper comprises a rotating shaft, a turbulence blade and a scraper; the turbulence blade is distributed along the height direction of the rotating shaft; the tail end of the turbulence blade is connected with the scraper; the distance between the scraper and the raw coke oven gas channel, the distance between the scraper and the inner wall of a straight tube segment of the riser tube and the distance between the scraper and the inner wall of an axle tube can be adjusted; the transmission device is connected with the rotating shaft, and can be used for driving the rotating shaft to rotate.

Description

technical field [0001] The invention relates to the technical field of industrial waste heat recovery, in particular to a system and a method for cleaning graphite in a coke oven riser and recovering waste heat from raw coal gas. Background technique [0002] A large amount of high-temperature raw gas is produced during the coke oven production process, the temperature is 750-800°C, and the sensible heat brought out by the raw gas accounts for 36% of the heat expenditure of the coke oven. The current raw gas waste heat utilization technology mainly uses heat transfer oil waste heat utilization system or vaporization cooling system to recover the sensible heat of the straight pipe section of the coke oven riser, lowering the temperature of the raw gas to 500°C, and the recovered raw gas sensible heat is used for heat transfer oil. Raise the temperature or produce saturated steam. When the raw gas temperature is lower than 500°C, a large amount of tar will be precipitated and...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art that the heat of raw gas is wasted in vain, and the raw gas channel at the root of the riser is blocked by graphite, the present invention provides a system for cleaning the graphite

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