Salt cavern gas storage brine discharging device and brine discharging method

The salt cavern gas storage brine discharging device comprises a gas injection pipe, a water injection pipe and a brine discharging pipe, and the water injection pipe is inserted into the gas injection pipe and used for adjusting pressure through gas injection; a brine discharging pipe is inserted into the water injection pipe and is used for injecting clear water to dilute brine in the salt cavern; a crystal crusher is arranged in the brine discharging pipe and is used for crushing brine crystals entering the brine discharging pipe. Brine and sediment in the salt cavern are diluted through the dilution cavity and then discharged through the brine discharging pipe, and due to dilution, the brine is not prone to crystallization; meanwhile, crystals can be broken through the crystal breaker, and blockage caused by the crystals can be effectively prevented; by discharging sediment, the available space of the salt cavern can be effectively increased, and the gas storage capacity is effectively increased; the prob