A Rotary Pressure Expander

  Use the Quasiturbine as a rotary pressure regulator for energy recovery.

  A Quasiturbine could be used to recover pressure energy from high pressure gas pipelines at local distribution stations.

  Because conventional turbines can not be widely modulated in rpm and load, they are not suitable for gas flow and pressure control, however a Quasiturbine is essentially a closed valve at zero rpm, and has high efficiency at all torques and all flow rates.

  Instead of using a conventional pressure regulator (which is an energy dissipative device), a pneumatic Quasiturbine could be made to rotate under the pressure differential of a gas pipeline pressure reduction station.
  The flow rate of the expanding gas could be controlled by the rpm of the Quasiturbine, which itself could be controlled by the torque applied on the Quasiturbine shaft.

  In this way, a Quasiturbine could act as a dynamic active rotary valve, and transform the pressure differential into useful mechanical work.
This rotary energy could be used to run a pump, a compressor, or a ventilator.
It could also be used for generate electricity locally or could be converted into high grade heat, which could be used to pre-heat the gas before expansion.
This would avoid any residual condensation, as is done with conventional regulators.
(Producing high value mechanical or electrical energy is preferable even if some of the gas has to be burnt to avoid excessive expansion cooling.)
  With such a system, any heat added before the Quasiturbine expands the gas will increase the available volumetric flow with the result that this heat is converted in mechanical energy with a very high efficiency.

  Ignoring gas expansion and considering only the gas pressure flow, a 36 inches diameter gas pipeline at 700 psi will typically have a pressure power in excess of 30MW.

This essentially zero pollution energy system could be placed in the heart of cities or industrial parks.