| abstract |
The invention discloses a turbine expansion system for grouped low-temperature gas liquefaction, which comprises: the system comprises a cold box, turbo-expansion units and oil supply stations, wherein each turbo-expansion unit is connected with the cold box through a pipeline, each oil supply station is connected with the corresponding turbo-expansion unit through an oil supply pipe and an oil return pipe, every two adjacent turbo-expansion units are combined into a unit, when the number of the remaining turbo-expansion units is three, the remaining three units are combined into a unit, two oil supply pipes corresponding to the two units of the turbo-expansion units are connected through a pipeline with a valve, and two oil return pipes corresponding to the unit are connected through a pipeline with a bidirectional pump; three oil supply pipes that the unit that turboexpander set quantity is three corresponds communicate each other through the pipeline of taking the valve, and three return oil pipes that this unit corresponds communicate each other through the pipeline of taking the two-way pump, still include: and a central controller. The system can ensure that each turboexpander set can reliably and stably operate. |