Backpressure steam turbine drive system with low pressure deaerator mixed heat exchange condensing

Abstract

The invention provides a back pressure type steam turbine driving system capable of mixing heat exchange condensation with a low pressure deaerator. The back pressure type steam turbine driving system capable of mixing heat exchange condensation with the low pressure deaerator comprises a driving steam turbine, a low pressure deaerator, a low pressure water feeding pump and an adjusting system which is required for the operation of the back pressure steam turbine driving system. Extraction steam from a main steam turbine gets into the driving steam turbine and works to drive a fan or a water pump. Exhaust steam of the driving steam turbine gets into the low pressure deaerator directly and is mixed with condensed water which is from the export of a low pressure heater of the main steam turbine. The condensed water is sent back to a low pressure heating system of the main steam turbine through the low pressure water feeding pump after heated by the exhaust steam, so that the recovery of heat can be realized. The system solves the exhaust steam problem of the driving steam turbine, so that when a user uses the driving steam turbine, the forced usage of a straight condensing type steam turbine which is low in efficiency and high in cost can be avoided. The exhaust steam can get into the low pressure deaerator directly, so that the back pressure type steam turbine which is high in heat efficiency can be used.

Description

technical field [0001] The invention belongs to the technical field of steam turbines. Specifically, the invention relates to a back pressure steam turbine drive system with a low-pressure deaerator, mixed heat exchange and condensation. Background technique [0002] Pumps or fans are important auxiliary machines in power plants and are generally driven by electric motors. As the utilization hours of my country's thermal power plants decrease and the load rate of units is low, the demand for speed regulation and energy saving of pumps or fans is increasing. There is power, and the equipment failure rate is high, and the equipment life is limited; while the efficiency of permanent magnet speed regulation is relatively low, and the equipment is expensive. More importantly, these two speed regulation methods are all driven by motors, which cannot solve the inherent contradiction of high power consumption in power plants. The use of steam turbine drive can not only realize auto...

AI Technical Summary

Problems solved by technology

This system not only simply solves the problem of driving steam source, but also reduces the loss of the cold end of the main engine and obtains the benefits of the power consumption rate of the power plant. It is a new system that can save energy and reduce emissions.

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