Back-pressure turbine refers to a turbine where the exhaust steam pressure is greater than atmospheric pressure.
Back-pressure steam turbines can be used for heating, drying, sterilization, and other processes. When a back-pressure turbine is used to supply steam to existing medium and low-pressure turbines, replacing the medium and low-pressure boilers of old power plants, it is also known as a preliminary turbine. This not only increases the power generation capacity of the existing power plant but also improves its thermal economy. The design pressure of the exhaust steam from heating back-pressure turbines varies depending on the specific heating purpose; the back pressure of preliminary turbines is usually greater than 5 MPa, depending on the steam parameters of the original unit. After the exhaust steam is utilized in the heating system, it condenses into water, which is then pumped back to the boiler as make-up water. Generally, the condensate from a heating system cannot be fully recovered, and make-up water is required.
Turbine structural characteristics
Structural Form: Quick-assembly Multi-Stage Steam Turbine
Arrangement: Single-layer or double-layer
Mechanical Speed Control: Full hydraulic adjustment; Imported TG series mechanical speed controller;
Electronic Speed Control (Domestic or Imported): DEH Electro-hydraulic Speed Regulator, 505 Digital Hydraulic Speed Regulator
Over-speed Protection: Mechanical hammer protection and electromagnetic valve electronic intelligent control
Gasket Type: Aluminum carbon spring compensated seal with no gap, stainless steel blade labyrinth gas seal, honeycomb contact gas seal
Main Valve: Integrated Automatic Main Valve (Quick Close and Regulation Combination Valve)
Main shaft assembly: Multi-speed impeller blades, sleeve fit rotor and impeller套装
Lubrication System: Oil lubrication (supplied with a joint lubrication station)
Thermal Expansion Compensation: Front bearing support with sliding thermal compensation
Electrical Configuration: Complete control cabinets, protection cabinets, main control cabinets, and matching domestic generators (voltage range: 400-6300-10050V).
Handwheel operation
