Small turbine system in power plant and thermal cycle system in power plant containing same

Abstract

The invention provides a small turbine system in a power plant for recovering the exhaust steam heat to the thermal cycle system in the power plant. The system comprises a backheating-type small turbine unit and a driven device driven by the backheating-type small turbine unit. The backheating-type small turbine unit comprises a small turbine, a small turbine admission pipe system and a small turbine exhaust pipe system. The small turbine admission pipe system is arranged on the upstream of the small turbine and receives steam source from the thermal cycle system in the power plant; the small turbine exhaust pipe system is arranged on the downstream of the small turbine; the exhaust steam of the small turbine exhaust pipe system enters to the backheating unit of the thermal cycle system in the power plant so that the exhaust heat is recovered. The invention further provides a backheating system and a thermal cycle system in the power plant containing the small turbine system in the power plant. The systems can greatly improve the power supply efficiency of the unit.

Description

technical field [0001] The invention relates to a power plant system, in particular to a small steam turbine system in a power plant and a thermal cycle system of a power plant containing the system. Background technique [0002] At present, my country's power supply demand is increasing day by day, and the installed capacity is also increasing rapidly year by year. While greatly increasing the parameters of the unit to improve the efficiency of power generation, how to improve the efficiency of power consumption, that is, reduce the power consumption rate of the plant, is getting more and more attention. [0003] At present, the way to greatly reduce the power consumption rate of the plant is mainly to change the large-scale equipment of the power plant from the drive of the electric motor to the drive of the small steam turbine, so that the large-capacity motor can be eliminated, so as to achieve the purpose of greatly reducing the power consumption of the plant. The "smal...

AI Technical Summary

Problems solved by technology

but either figure 1 or figure 2 In the system shown, the small steam turbines are all of the condensing type, and the exhaust steam is condensed into condensed water through circulating water (cold source), so that only the working fluid of the exhaust steam can be recovered, but the heat of the exhaust steam (this heat accounts for More than half of the heat of the source steam) will be discharged with the circulating water, so that the entire cycle efficiency is not high

[0005] Moreover, in the above-mentioned traditional condensing small steam turbine drive technology, since the efficiency of the small steam turbine is much lower than that of the main steam turbine, after some large equipment is driven by a small steam turbine instead of an electric motor, it can only reduce the power consumption of the plant. purpose, the power supply efficiency of the entire power plant is reduced

Images