Coal gas filtering device suitable for annealing furnace

Abstract

The invention provides a coal gas filtering device suitable for an annealing furnace. The device comprises a coal gas pipeline and a filtering device; the coal gas pipeline is arranged between a maincoal gas inlet pipe and the annealing furnace and is used for conveying coal gas to a nozzle in the annealing furnace; the filtering device is arranged on the coal gas pipeline and is used for filtering the coal gas; the filtering device comprises a shell and a filtering containing cavity formed in the shell; the filtering containing cavity is communicated with an air inlet and an air outlet of the shell; a filter element is arranged in the filtering containing cavity; the filter element is of a cylinder structure with the two ends open and the surface provided with a plurality of filtering holes; one end of the filter element is communicated with the air inlet, the other end of the filter element is detachably connected with a sealing cover movably mounted on the shell; the coal gas enters the annealing furnace through the gas inlet, the filter element and the gas outlet in sequence. Impurities such as tar in the coal gas can be effectively filtered out, blockage of the impurities ina coal gas electromagnetic valve and a nozzle is avoided, only the filtering device needs to be cleaned during cleaning, and the coal gas electromagnetic valve does not need to be frequently disassembled.

Description

technical field [0001] The invention relates to the technical field of gas filtering equipment, in particular to a gas filtering device. Background technique [0002] There are many impurities such as tar, water and other impurities in the blast furnace and coke oven mixed gas used in the annealing furnace of the common plate continuous retreat unit. Although a filter device is installed on the gas main pipe, the impurities in the gas branch pipe before the nozzle after long-term use are on the gas solenoid valve. Accumulation leads to reduced gas flow from nozzles and insufficient heating capacity. In response to this problem, in order to ensure the heating capacity of the furnace area, the gas solenoid valve needs to be cleaned frequently on site. After a long time of cleaning, the gas solenoid valve may be damaged, and the cleaning time of the gas solenoid valve is long, which affects the production progress. SUMMARY OF THE INVENTION [0003] In order to solve the abov...

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Problems solved by technology

[0002] The mixed gas of the blast furnace and coke oven used in the annealing furnace of the general board continuous annealing unit contains a lot of tar, water and other impurities. Although a filter device is installed on the gas main pipe, the impurities in the gas branch pipe in front of the nozzle after long-term use are on the gas solenoid valve. Accumulation leads to reduced nozzle gas flow and insufficient heating capacity

To solve this problem, in order to ensure the heating capacity of the furnace area, the gas solenoid valve needs to be cleaned frequently on site. After cleaning for a long time, the gas solenoid valve is easy to be damaged, and the cleaning of the gas solenoid valve takes a long time, which affects the production progress.

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