Fire extinguishing and explosion proofing equipment employing liquid nitrogen as fire extinguishing agent

Abstract

The invention discloses fire extinguishing and explosion proofing equipment employing liquid nitrogen as a fire extinguishing agent and belongs to the technical field of fire extinguishing and explosion proofing. The fire extinguishing and explosion proofing equipment is composed of a storage tank, an evaporator, an ultralow temperature liquid pump, an electric self-control valve group, a heat insulation pipe, a nozzle and a control system, wherein the storage tank is a cylindrical tank body, the wall of the tank body is divided into three layers, the tank body is formed by welding stainless steel materials, interlayers are filled with thermal insulation materials, and the tank body is provided with a pressure gauge, a liquid level meter, a safety valve, a tank emptying valve, an evaporator valve, a prefill valve, a purification valve and an ultralow-temperature pump valve; the evaporator and the ultralow-temperature liquid pump are arranged; the electric self-control valve group comprises the evaporator valve, the ultralow-temperature pump valve, a pump emptying valve and a diverter valve; and the control system comprises a temperature detector, a smoke detector, a gas detector, an alarm, a CRT display system, a linkage controller and a fire extinguishing control panel. The tank body is good in thermal insulation effect, nitrogen is not leaked when the liquid nitrogen resists the pressure of 0.8 MPa at the temperature of -196 DEG C, fire extinguishing and explosion proofing are automatically monitored, a fire is rapidly cooled, fire extinguishing is rapid, the environment is not polluted, materials in a fire place are not damaged, the fire extinguishing and explosion proofing equipment can control the gas concentration when used underground, and personal and property losses caused by explosion are avoided.

Description

technical field [0001] The invention belongs to the field of fire-fighting and explosion-proof technology, and in particular relates to a fire-extinguishing and explosion-proof equipment using liquid nitrogen as a fire extinguishing agent. Background technique [0002] At present, the fire extinguishing agents used for fire extinguishing at home and abroad mainly include water, foam, haloalkane series, and high and low pressure carbon dioxide. The use of these fire extinguishing agents will cause serious pollution and damage to important secretarial files and valuables. Haloalkane series fire extinguishing agents are harmful to the atmosphere. The ozone layer also has a destructive effect and has been gradually eliminated globally; high and low pressure carbon dioxide has a certain impact on the atmospheric greenhouse effect. The use of liquid nitrogen as a fire extinguishing agent can absorb a large amount of heat during the gasification process, so that the fire can be qui...

AI Technical Summary

Problems solved by technology

However, because the heat insulation treatment of ordinary liquid nitrogen storage tanks is not well solved, the heat insulation performance is poor, and the liquid will leak seriously after long-term storage. When a fire occurs, the performance of the storage tank often does not meet the specified requirements, and it is not a special emergency rarely used

So far, there is no precedent for using liquid nitrogen as a fire extinguishing agent for explosion protection, especially the frequent explosion accidents caused by underground gas in coal mines. If the fire extinguishing and explosion-proof equipment using liquid nitrogen as a fire extinguishing agent is used, it will be of great significance to underground safety and reduce losses. major

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