Method and system for comprehensively utilizing steam turbine dead steam latent heat

Abstract

The invention belongs to the technical field of heat energy comprehensive utilization, and particularly relates to a method and system for comprehensively utilizing steam turbine dead steam latent heat. The method comprises the steps that dead steam is exhausted through a steam turbine, and the dead steam exhausted through the steam turbine is transmitted to a waste-heat utilization condensation system which carries out latent heat and condensate the dead steam into water through the dead steam to finish the Rankine cycle. The system comprises the steam turbine and the waste-heat utilization condensation system which is connected with the steam turbine to carry out latent heat and condensate the dead steam through the dead steam to finish the Rankine cycle. A condenser utilizing the waste heat can be a specially-designed low-temperature and multi-effect evaporation sea water desalting plant and can also be a single-effect lithium bromide absorption air conditioner unit. According to the method and system, the low-pressure dead steam latent heat can be efficiently utilized under the condition that the generating efficiency of a turboset is high.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of heat energy, and in particular relates to a method and a system for comprehensive utilization of latent heat of exhaust steam of a steam turbine. Background technique [0002] The use of traditional steam turbines to generate electricity has a history of more than 100 years. Usually, in these systems, heat energy is used to generate high-temperature and high-pressure steam, and the steam drives the rotor to rotate through the steam turbine, and converts the heat energy of the high-pressure steam into mechanical energy to do work. The mechanical energy can be used directly or generated by a generator. In order to obtain a higher (30-45%) thermoelectric conversion efficiency, the pressure of the exhaust exhaust gas discharged from the steam turbine outlet must be as low as possible; usually water cooling or air cooling is used, and the condensation pressure of the exhaust gas is...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this structure is that the power generation efficiency will be significantly reduced - usually the power generation efficiency of the back pressure steam turbine is only 10% or even lower

Therefore, it is necessary to provide a method and system to overcome the traditional method of wasting the low-temperature latent heat of steam turbine exhaust steam, and to efficiently utilize the latent heat of low-pressure exhaust steam while maintaining high thermal power generation efficiency

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