Smoke high-temperature dust removal and steam and coal gas recovery system and method for calcium carbide furnace

Abstract

The invention relates to a smoke high-temperature dust removal and steam and coal gas recovery system and a smoke high-temperature dust removal and steam and coal gas recovery method for a calcium carbide furnace. The calcium carbide furnace is connected with an evaporative cooling tower through a water-cooling flue and connected with the bottom of a high-temperature bag-type dust remover; the upper part of the calcium carbide furnace is connected with an afterheat boiler; and the afterheat boiler is connected with the bottom of a radiation chimney and the bottom of a coal gas cooling tower respectively. The method comprises the following steps of: reducing smoke temperature of the calcium carbide furnace to 500 DEG C through the water-cooling flue or cooling the smoke temperature of the calcium carbide furnace through the evaporative cooling tower and controlling the temperature at 500 DEG C or so; purifying the smoke with reduced temperature in the high-temperature bag-type dust remover; recovering steam of the purified coal gas through the afterheat boiler; and pressurizing the coal gas by a fan and sending the coal gas into the coal gas cooling tower through a switching valve, cooling the coal gas and sending the cooled coal gas to a user or sending the coal gas to the radiation chimney through the switching valve for ignition and emptying. In the invention, the high-temperature dust remover which can resist the temperature more than 400 DEG C is adopted and an air cooler is canceled, so that the problem that a filter bag of the bag-type dust remover is burned or pasted due to factors such as the smoke temperature, tar and the like can be solved, the dust removal efficiency is improved and a stable and clean coal gas source can be provided for a gas kiln.

Description

technical field [0001] The invention relates to a high-temperature dust removal and steam recovery system, in particular to a calcium carbide furnace flue gas high-temperature dust removal and steam and gas recovery system and method thereof. Background technique [0002] At present, calcium carbide enterprises are required to adopt large-capacity fully-sealed calcium carbide furnace technology, and calcium carbide furnace flue gas dedusting usually has two types: wet dedusting and dry dedusting. [0003] The wet dedusting process is relatively mature, but it is gradually eliminated due to factors such as large energy consumption and high operation and maintenance costs. [0004] Dry dedusting technologies mainly include: using combustion method to recover steam and then dedusting, or adopting unburned method to dedust and then recover gas. Calcium carbide enterprises need the latter the most, that is, recovering gas as fuel to produce lime and power stone production. Dry ...

AI Technical Summary

Problems solved by technology

[0006] The task of the present invention is to provide a high-temperature dedusting and steam and gas recovery system and method for calcium carbide furnace flue gas. It overcomes the above-mentioned difficulties in the prior art. Solve the problem of filter bag burning or bag sticking caused by factors such as flue gas temperature and tar in the above-mentioned bag filter, improve dust removal efficiency, and provide a stable and clean gas source to the gas-fired kiln; when the waste heat boiler is installed, steam can also be recovered , used for domestic heating, etc.

Images