190kW shaft output power from the expander is very large. Working on a isentropic efficency of around 0.6 ish, enthalpy change will be around 66kJ/kg and therefor mass flow will be around 2.88kg/s giving a volume flow at the expander inlet of around 2.88cum/s and around 26.5cum/s at the outlet. With these sorts of flow you have no option but to go for turbo compressors/expanders and large ones as well.