Movable liquid nitrogen fire extinguishing system and fire extinguishing method for comprehensive pipe gallery

Abstract

The invention discloses a movable liquid nitrogen fire extinguishing system for a comprehensive pipe gallery. The movable liquid nitrogen fire extinguishing system comprises a nitrogen making assembly, a fire extinguishing assembly, a monitoring device and a nitrogen conveying pipeline. The movable fire extinguishing assembly comprises a liquid nitrogen storage tank and a liquid nitrogen booster pump, the liquid nitrogen storage tank is connected with the liquid nitrogen booster pump, the liquid nitrogen booster pump conveys liquid nitrogen to a branch pipe in the pipe gallery through the nitrogen conveying pipeline, and a nitrogen injection opening is formed in the branch pipe; the nitrogen making assembly is movable and is used for conveying the prepared liquid nitrogen to the liquid nitrogen storage tank; and the monitoring device comprises a first monitoring assembly and a second monitoring assembly, a controller automatically adjusts the pressure in the liquid nitrogen storage tank through the first monitoring assembly and automatically supplements liquid nitrogen, and the controller monitors the flow of the liquid nitrogen introduced into the nitrogen conveying pipeline through the second monitoring assembly. The movable liquid nitrogen fire extinguishing system for the comprehensive pipe gallery is simple in structure, not only achieves unified nitrogen production, nitrogen storage and nitrogen supply fire extinguishing and guarantees sufficient supply and continuous fire extinguishing of liquid nitrogen, but also achieves flexible movement, is small in occupied space, stable in liquid nitrogen conveying and higher in fire extinguishing efficiency.

Description

technical field [0001] The invention relates to the field of fire extinguishing in a pipe gallery, in particular to a mobile liquid nitrogen fire extinguishing system for a comprehensive pipe gallery and a fire extinguishing method thereof. Background technique [0002] The fire prevention and extinguishing system of domestic urban underground comprehensive pipe gallery mainly adopts dry powder fire extinguishing system, water spray fire extinguishing system and fine water mist fire extinguishing system, but there are certain deficiencies in all of them. For example, in the fire extinguishing system used in the existing integrated pipe gallery, the dry powder fire extinguishing system has high requirements for starting current and relatively low reliability, and it will also bring secondary disasters, and because the interior of the underground cabin is humid, the moment when the dry powder is sprayed is easy to cause damage. Condensation under the influence of water vapor l...

AI Technical Summary

Problems solved by technology

[0004] The method of direct injection of liquid nitrogen is mostly used for fire fighting in mines. Usually, a large amount of liquid nitrogen needs to be poured into the fire fighting. However, the preset system has no nitrogen storage equipment and nitrogen production equipment, so it needs to temporarily deploy liquid nitrogen tank trucks, which cannot guarantee the continuous supply of liquid nitrogen. , if the fire extinguishing operation lasts for a long time, the demand for liquid nitrogen is large, and long-distance transportation will lead to delays in fire extinguishing time and increased risks; and when used as an auxiliary fire extinguishing agent for cooling, liquid nitrogen usually needs to go through a long period of time before injection. The pipeline is used to increase the cooling effect of the main fire extinguishing agent, resulting in a large amount of gasification of liquid nitrogen. And the property of easy gasification and expansion may lead to the failure of the main fire extinguishing agent or blockage of the pipeline, poor reliability, and it is difficult to meet the fire prevention requirements of the integrated pipe gallery

In addition, the traditional supporting fire extinguishing equipment is usually set in a fixed way according to the protected area, which cannot be moved in real time, and has problems such as poor flexibility and large space occupation.

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