Pack-level and space-level liquid nitrogen fire suppression linkage system and method for energy storage power station

A pack-level and space-level liquid nitrogen fire suppression linkage system for an energy storage power station, comprising an energy storage cabin,

• wherein inside the energy storage cabin, energy storage rooms in which battery clusters are stored are provided, each energy storage room forms an independent fire protection subarea;
• a fan, a plurality of combined detectors, and a control valve are provided in each fire protection subarea, and an audible and visual alarm and an emergency start-stop switch are provided on an outside surface of each energy storage room;
• two circular holes are formed on an upper side of a panel of each pack in each battery cluster, with one circular hole for mounting a fire detector and another circular hole for laying a pack-level liquid nitrogen fire suppression branch pipe;
• an automatic quick opening valve is provided at a middle part of each pack-level liquid nitrogen fire suppression branch pipe, and a fire extinguishing nozzle is provided at a tail end of each pack-level liquid nitrogen fire suppression branch pipe;
• two fire suppression cylinder rooms are provided on two opposite sides within the energy storage cabin respectively, and a liquid nitrogen explosion and fire suppression device is provided in each fire suppression cylinder room;
• a nitrogen cylinder and a liquid nitrogen tank are provided in the liquid nitrogen explosion and fire suppression device;
• a gas inlet, a liquid outlet, and a liquid replenishing port are provided at a top of the liquid nitrogen tank;
• an end of a gas outlet pipe is connected to a top of the nitrogen cylinder, and another end of the gas outlet pipe is connected to an end of a pressure relief valve;
• another end of the pressure relief valve is connected to an end of a first solenoid valve, and another end of the first solenoid valve is connected to the gas inlet at the top of the liquid nitrogen tank;
• the liquid outlet at the top of the liquid nitrogen tank is connected to an end of a liquid nitrogen fire suppression main pipe of a corresponding fire protection subarea;
• the liquid nitrogen fire suppression main pipe comes out of a top of the liquid nitrogen explosion and fire suppression device and has another end connected to an end of a second solenoid valve, and another end of the second solenoid valve is connected to a first end of a diversion valve;
• a second end of the diversion valve is connected to a space-level liquid nitrogen fire suppression pipe and a third end of the diversion valve is connected to a pack-level liquid nitrogen fire suppression main pipe, and a plurality of fire extinguishing nozzles are provided on the space-level liquid nitrogen fire suppression pipe;
• a space-level liquid nitrogen fire suppression pipe and a pack-level liquid nitrogen fire suppression main pipe of a fire protection subarea of the fire protection subareas are connected with a space-level liquid nitrogen fire suppression pipe and a pack-level liquid nitrogen fire suppression main pipe of an adjacent fire protection subarea of the fire protection subareas respectively, via respective third solenoid valves being provided at connections;
• the combined detectors, fire detector, and liquid nitrogen explosion and fire suppression devices are connected to a fire alarm host;
• and the combined detectors and the fire detector have a graded warning mechanism.