System and method for separating xenon-krypton mixed gas by hydrate formation process

A system for separating xenon-krypton mixed gas by hydrate formation process, wherein including a gas hydrate generating unit, a heat exchanging unit and a gas-water separating unit, wherein:

• a main device of the gas hydrate generating unit is a reaction tower, pre-cooled xenon-krypton mixed gas is injected into the tower from a bottom of the reaction tower through a gate valve A and a flow control valve A, a gas-liquid separating membrane is placed at a bottom of a porous tray where the mixed gas contacts first, an interfacial area of the gas-liquid separating membrane is larger than a cross-sectional area of the reaction tower, and the gas-liquid separating membrane is built between the porous tray and the bottom of the tower in an inclined manner to prevent a hydrate slurry from blocking an air inlet of the bottom of the tower, and guiding converging of the hydrate slurry simultaneously;
• when the mixed gas moves upwards in the reaction tower, the xenon gas contacts with water attached to the porous tray to generate a xenon hydrate particle, residual gas is discharged from a top of the reaction tower, and a back-pressure control valve is installed at an outlet of the top of the reaction tower to stabilize an air pressure in the reaction tower, and ensure continuous generation of a xenon hydrate in the tower;
• and pre-cooled water is injected from the top of the tower through a gate valve B and a flow control valve F, which is used to generate the hydrate on one hand, and washes the hydrate particle on the porous tray to a space enclosed by the gas-liquid separating membrane and a tower wall to converge into the hydrate slurry to enter the heat exchanging unit through a flow control valve B on the other hand;
• main devices of the heat exchanging unit are a heat exchanger A and a heat exchanger B, and the hydrate slurry enters the heat exchanging unit through two paths after passing through a fluid diversion device;
• one path of the hydrate slurry enters the heat exchanger B as a cold fluid after being pressurized by a flow control valve C and a delivery pump B, a hot fluid of the heat exchanger B is decomposed water from the gas-water separating unit, the hydrate particle in the slurry is decomposed by absorbing heat carried by the decomposed water through heat exchange between the cold and hot fluids, the hydrate slurry is converted into a gas phase flow and a water phase flow, and enters the gas-water separating unit through a delivery pump E, and the cooled decomposed water is injected into the reaction tower through a delivery pump G and a flow control valve F;
• the other path of the hydrate slurry enters the heat exchanger A as a cold fluid after passing through a flow control valve D and a delivery pump A, a hot fluid of the heat exchanger A is normal-temperature xenon-krypton mixed gas pressurized by a delivery pump D, the hydrate particle in the slurry is decomposed by absorbing heat carried by the normal-temperature mixed gas through heat exchange between the cold and hot fluids, the hydrate slurry is converted into a gas phase flow and a water phase flow, and enters the gas-water separating unit through the delivery pump E, and the cooled mixed gas enters the reaction tower through a delivery pump C and a flow control valve A;
• and
• a main device of the gas-water separating unit is a gas-water separating tower, the gas phase flow and the water phase flow containing the xenon gas are injected from a middle position of the gas-water separating tower after being pressurized by the delivery pump E, under an action of gravity, the xenon gas is separated from the decomposed water, wherein the xenon gas rises to the top of the tower, and is discharged by a flow control valve E after being dehumidified by a drying bed;
• and the decomposed water sinks to the bottom of the tower, and enters the heat exchanger B to participate in the heat exchange after being pressurized by a delivery pump F.