A back-pressure steam turbine is a rotary-drive device that converts the magnetic fluid power of steam into mechanical energy. It consists of a rotor (the rotating part, collectively comprising the main shaft bearing, centrifugal impeller, blades, coupling, and associated components) and a stator (the stationary part, collectively comprising the cylinder, steam inlet assembly, exhaust assembly, condenser, pump sealing system, bearings, and trip mechanism, among others). Primarily used as a power-generation drive, it can also directly drive various pumps, centrifugal fans, refrigeration compressors, and ship or aircraft propellers. Moreover, the exhaust steam or intermediate extraction from a back-pressure steam turbine can be utilized to meet heating demands for both industrial production and residential use.
3. Back-pressure steam turbines are used to drive various boiler feedwater pumps and centrifugal fans with installed capacities of 100 MW or less. Currently, our company offers eight series comprising more than 30 different models of back-pressure steam turbines. Back-pressure steam turbines possess unique advantages that no other type of drive can replace: they can meet customers’ requirements for both power generation and steam consumption, while achieving high overall energy utilization and low power generation costs. Moreover, they can also handle sudden power outages in the power grid without disrupting the operation of process equipment, which is a critical requirement for many industrial processes.
Fourth, backpressure steam turbines can be used in power plant cooling-water heating systems. In winter, the cooled circulating water is utilized entirely for district heating, thereby generating significant economic benefits for the power plant. However, when the circulating pumps at the power plant are replaced with high-head pumps (typically by adding such pumps), energy consumption increases. On the other hand, in the North China region, relying solely on cooled circulating water for heating results in somewhat lower heating temperatures, often necessitating the addition of fresh steam to raise the heating temperature further. Under these circumstances, if small- and medium-sized backpressure steam turbines are employed during system upgrades and renovations to drive the circulating pumps, and the steam after doing work is used to heat the cooled circulating water, the heating system can simultaneously save energy consumed by the pumps and increase the temperature of the circulating water—achieving a win-win outcome.
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