MOBILE LIQUID NITROGEN FIRE EXTINGUISHING SYSTEM FOR COMPREHENSIVE PIPE GALLERY AND FIRE EXTINGUISHING METHOD THEREFOR

摘要

A mobile liquid nitrogen fire extinguishing system for a comprehensive pipe gallery, comprising a nitrogen producing assembly, a fire extinguishing assembly, a monitoring device and a nitrogen conveying pipeline, wherein the mobile fire extinguishing assembly comprises a liquid nitrogen storage tank (3) and a liquid nitrogen booster pump (4), the liquid nitrogen storage tank is connected to the liquid nitrogen booster pump, the liquid nitrogen booster pump conveys liquid nitrogen to branch pipes (73) in a pipe gallery by means of the nitrogen conveying pipeline (7), and nitrogen injection ports (71) are provided on the branch pipes; the nitrogen producing assembly is mobile and conveys the prepared liquid nitrogen to the liquid nitrogen storage tank; the monitoring device comprises a first monitoring assembly and a second monitoring assembly; a controller (5) automatically adjusts the pressure in the liquid nitrogen storage tank by means of the first monitoring assembly and automatically replenishes the liquid nitrogen; and the controller monitors the flow of the liquid nitrogen into the nitrogen conveying pipeline by means of the second monitoring assembly. The fire extinguishing system not only implements the unified process of nitrogen production, nitrogen storage, and nitrogen supply for fire extinguishing, and ensures the sufficient supply of liquid nitrogen and continuous fire extinguishing, but also implements flexible movement, small space occupation, the stable transmission of liquid nitrogen, and higher fire extinguishing efficiency.