Consultation on how to achieve unit pressure drop without power consumption

[zasddsgg]

Hello, if I want to reduce the pressure of stream (high pressure) of the reactor outlet to one atm, could I consult you what unit can I use? If the Tank is used, it seems that the pressure drop cannot be achieved, and if the pump is used, it seems that the pump will consume electricity, but the pressure drop can be achieved by opening the reactor in actual production, and no power consumption is required. Could I ask you how to simulate this process?

Thanks for your help. Wish you a good day.