Backstop device for preventing oil slurry from reverse flow, preparation technology thereof and air inlet and stock feeding distributor

The invention relates to the field of petroleum refining, in particular to a backstop device for preventing the oil slurry from reverse flow, a preparation technology thereof and an air inlet and stock feeding distributor. The backstop device for preventing oil slurry from reverse flow is used for preventing the oil slurry from reversely flowing into the slurry bed gas and stock feeding distributor, which comprises a nozzle component, a first connecting pipe, a second connecting pipe and a one-way valve, wherein the one-way valve is arranged between the first connecting pipe and the second connecting pipe, the first connecting pipe and the second connecting pipe are respectively connected with the one-way valve, and the second connecting pipe is connected with the nozzle component. When the gas supply of the gas and stock feeding distributor is interrupted, the one-way valve effectively inhibits the oil slurry from reversely flowing to the branch air inlet pipe and the annular pipe ofthe gas and stock feeding