US 12,324,939 B2
Mobile liquid nitrogen fire extinguishing system and method for utility tunnel
Guowei Zhang, Jiangsu (CN); Dong Guo, Jiangsu (CN); Huaxiang Li, Jiangsu (CN); Yinan Sun, Jiangsu (CN); Zheng Li, Jiangsu (CN); Zhiwei Zhang, Jiangsu (CN); Su Yan, Jiangsu (CN); and Junbin Huang, Jiangsu (CN)
Assigned to China University of Mining and Technology, Jiangsu (CN)
Appl. No. 18/003,312
Filed by CHINA UNIVERSITY OF MINING AND TECHNOLOGY, Jiangsu (CN)
PCT Filed Dec. 2, 2020, PCT No. PCT/CN2020/133285
§ 371(c)(1), (2) Date Dec. 23, 2022,
PCT Pub. No. WO2022/011934, PCT Pub. Date Jan. 20, 2022.
Claims priority of application No. 202010685954.6 (CN), filed on Jul. 16, 2020.
Prior Publication US 2023/0241431 A1, Aug. 3, 2023
Int. Cl. A62C 3/02 (2006.01); A62C 27/00 (2006.01); A62C 31/05 (2006.01); A62C 35/02 (2006.01)
CPC A62C 3/0221 (2013.01) [A62C 27/00 (2013.01); A62C 31/05 (2013.01); A62C 35/023 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A mobile liquid nitrogen fire extinguishing system for a utility tunnel, comprising:
a liquid nitrogen production assembly, a fire extinguishing assembly, a monitoring device, a liquid nitrogen conveying tubing, and a controller, wherein
the fire extinguishing assembly is arranged on a mobile platform, and comprises a liquid nitrogen storage tank and a liquid nitrogen booster pump; and a first liquid outlet on the liquid nitrogen storage tank is connected to the liquid nitrogen booster pump, the liquid nitrogen booster pump is provided with a second liquid outlet connected to a reserved interface of the liquid nitrogen conveying tubing, and conveys liquid nitrogen to branch pipes in the utility tunnel through the reserved interface of the liquid nitrogen conveying tubing, and liquid nitrogen injection ports are formed in each of the branch pipes;
the liquid nitrogen production assembly is mobile, and conveys the liquid nitrogen, which is prepared, into the liquid nitrogen storage tank;
the monitoring device comprises a proportional control valve, a first monitoring assembly that comprises a pressure gauge, a pressure regulating valve, a gas outlet device, and a pressure relief valve, and a second monitoring assembly that comprises a flow meter and a safety valve;
and the proportional control valve is located between the liquid nitrogen storage tank and the liquid nitrogen booster pump, the first monitoring assembly is mounted on the liquid nitrogen storage tank, and the second monitoring assembly is located between the liquid nitrogen booster pump and the liquid nitrogen conveying tubing; and
the controller is connected to the first monitoring assembly for pressure display and pressure regulation inside the liquid nitrogen storage tank, the controller is connected to the second monitoring assembly to control a flow of the liquid nitrogen input into the liquid nitrogen conveying tubing, the controller is connected to the proportional control valve to control a flow input into the liquid nitrogen booster pump, the controller is connected to the liquid nitrogen booster pump to control an output pressure, and the controller is connected to the liquid nitrogen production assembly to control opening and closing of the liquid nitrogen production assembly and liquid nitrogen conversion efficiency.