Backpressure steam turbine regenerative system with small steam turbine and design method of thermodynamic equilibrium

Abstract

The invention discloses a backpressure steam turbine regenerative system with a small steam turbine and a design method of thermodynamic equilibrium of the backpressure type steam turbine regenerative system. The backpressure type steam turbine regenerative system at least comprises a backpressure type steam turbine, an auxiliary device which is connected with the backpressure type steam turbine and used for heating and deoxidizing supplemented water and returned water of the regenerative system, a water supply power device used for providing power for the supplemented water and the returned water of the system to enable the the supplemented water and the returned water to circularly flow in the regenerative system, the small steam turbine connected with the back pressure type steam turbine and used for driving the water supply power device, and a condenser connected with the small steam turbine. The condenser serves as steam exhaust condensing equipment of the small steam turbine and further serves as primary deoxidizing and heating equipment of the the supplemented water and the returned water of the whole regenerative system, steam exhaust of the small steam turbine serves as a deoxidizing steam source of the steam condenser and is completely used for deoxidizing and heating the supplemented water and the returned water of the system, the heat exchange temperature difference is reduced, no cold end loss exists, and the system efficiency is improved.

Description

technical field [0001] The invention relates to the field of cogeneration equipment, in particular to a back-pressure steam turbine recuperation system with a small steam turbine and a heat balance design method thereof. Background technique [0002] In the field of petroleum refining and coal chemical industry, the technological process often requires a large amount of high-grade steam. At present, domestic industrial parks of this type are generally equipped with high-power, high-parameter cogeneration backpressure steam turbines during construction. [0003] The existing back-pressure steam turbine generally has a relatively simple recuperation system, and usually adopts the method of replenishing water in the heating system after the exhaust steam is depressurized. This method is low in efficiency; After the steam point, several lower-pressure flow stages are added to make the higher-quality steam continue to work and then go to the heating system to replenish water. Al...

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Problems solved by technology

[0003] The existing back-pressure steam turbine generally has a relatively simple recuperation system, and usually adopts the method of replenishing water in the heating system after the exhaust steam is depressurized. This method is low in efficiency; After the steam point, several lower-pressure flow stages are added to make the higher-quality steam continue to work and then go to the heating system to make up water. Although this method improves the system efficiency, it needs to adjust the exhaust pressure and pressure of the back pressure steam turbine during operation. Monitoring the amount of overflow steam complicates the operation adjustment, which is not conducive to the flexible adjustment and safe operation of the heating load; steam turbine, but its exhaust steam often leads to an independent condenser and is cooled by circulating water. This method does not effectively utilize the heat of the exhaust steam, and there is still a certain loss at the cold end

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