A fire extinguishing device and method for a flue gas purification system

Abstract

The invention relates to an extinguishing device and method of a purification system for carbon roasting furnace flue gas and other high-temperature flammable flue gas, belongs to the field of electrolytic aluminum factory roasting furnace flue gas and other flue gas processing, and aims to solve the problem that high-temperature flue gas in a roasting furnace flue gas purification system is easily flammable. A hole is arranged in the top part of a fume exhaust pipeline, an accident water spraying pipe is inserted in the hole, one end of the accident water spraying pipe is fixedly arranged in the fume exhaust pipeline through a positioning pipe, the spout of the accident water spraying pipe is arranged in the middle part of the fume exhaust pipeline, the other end of the accident water spraying pipe is connected to a water supply pipeline of a water supply pipe network, and a firefighting electromagnetic valve is arranged on the water supply pipeline. In a normal state, the firefighting electromagnetic valve is normally closed; when a signal detector detects that the flue gas temperature is higher than the preset value or a flame signal is detected in the fume exhaust pipeline, a processor will automatically open the firefighting electromagnetic valve, thus the accident water spraying pipe will start to spray water, the water is sprayed out from the spout of the accident water spraying pipe and enters the fume exhaust pipeline, and thus the fire is extinguished by water.

Description

technical field [0001] The invention relates to a fire extinguishing device and method for a carbon roasting furnace flue gas and other high-temperature combustible flue gas purification system, belonging to the field of roasting furnace flue gas and other flue gas treatment in electrolytic aluminum plants. Background technique [0002] The carbon roasting furnace is composed of several roasting chambers with the same structure, and the roasting furnace uses natural gas, heavy oil or coal gas as fuel. The asphalt mixed in the raw anode manufacture contains a certain amount of volatile matter. During the roasting process, most of the volatile matter is burned as fuel in the roaster, and the unburned bitumen volatile matter exists in the state of tar and is discharged with the flue gas of the roaster. After a period of operation, asphalt tar will be deposited and adhered to the inner wall of the exhaust pipe from the outlet of the carbon roaster to the purification system of t...

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Problems solved by technology

[0004] Aiming at the problem of high temperature and flammability of flue gas in the flue gas purification system of the existing roaster, the purpose of the present invention is to provide a fire extinguishing device and method for the flue gas purification system, which can quickly extinguish the flame in the flue to meet the requirements of carbon roasting. The purpose of normal production of the furnace and protection of the purification terminal equipment is to improve the safety and reliability of the carbon roasting furnace and the entire purification system

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