Generally, there are three types of expanders, namely, low-pressure expander, medium pressure expander and liquid expander. For a certain type of gas expander, the greater the volume flow of working medium, the higher the efficiency. Generally, the efficiency of the low-pressure expander with a flow of more than 8000nm is 85 ∽ 88%, and the efficiency of the expander with a flow of less than 3000 ∽ 8000nm will be as low as 70 ∽ 80%.
In view of the problems existing in No. 1 TRT turbine unit of medium and thick plate company of Tangshan Iron and Steel Co., Ltd., measures such as turbine transformation, shaft end seal optimization and top pressure regulation control program optimization were taken to ensure the long-term safe and