System and method for increasing hydrogen recovery rate in oil refinery styrene dehydrogenation tail gas

The invention discloses a system and method for increasing the hydrogen recovery rate in oil refinery styrene dehydrogenation tail gas, and belongs to the technical field of oil refinery hydrogen recovery. According to the technical scheme, the system comprises a hydrogen production pressure swing adsorption unit and a high-purity hydrogen pressure swing adsorption unit for an oil refinery, the hydrogen production pressure swing adsorption unit is provided with a hydrogen production shift gas inlet, a styrene dehydrogenation tail gas inlet, a desorbed gas outlet and an industrial hydrogen outlet, the styrene dehydrogenation tail gas inlet is connected with a compressor, and the desorbed gas outlet is connected with a fuel gas pipe network; the industrial hydrogen outlet is connected with an industrial hydrogen outlet pipe and an industrial hydrogen transmission pipe; and the high-purity hydrogen pressure swing adsorption unit is provided with a gas inlet, a desorbed gas outlet and a high-purity hydrogen outle