Method for transforming condensing steam turbine into back-pressure steam turbine

Abstract

The invention discloses a method for transforming a condensing steam turbine into a back-pressure steam turbine. The condensing steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and condensers of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder, wherein the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the condensers of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are sequentially in communication. A rotor penetrates the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder. The method comprises the following technology measures that the rotor of the condensing steam turbine is transformed, andthe part, located in the low-pressure cylinder, of the rotor is treated into a polished shaft rotor; all partition plates of the low-pressure cylinder are dismounted, and an original water spraying cooling device in the low-pressure cylinder is retained; a low-pressure end steam seal ring is newly arranged, and the low-pressure cylinder steam seal gap is adjusted; and a low-pressure cylinder steam cooling system is eliminated, and all exhaust steam of the medium-pressure cylinder is guided into a heat supply pipeline and communicates with a heat consumer for heat supply. According to the method, the old original steam turbine rotor is directly utilized, low-pressure machining transforming is conducted to achieve the polished shaft rotor, the transformation cost is reduced, and the work period is shortened. The low-pressure cylinder steam cooling system commonly arranged in conventional transformation is eliminated, and system arrangement is simplified.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a method for transforming a condensing steam turbine into a back pressure steam turbine. Background technique [0002] The current steam turbine back pressure transformation in thermal power plants mainly adopts the method of directly replacing the original rotor of the steam turbine, and directly replaces the low-pressure rotor with the optical axis rotor; after the transformation and design of the connecting pipe of the medium and low pressure cylinder of the steam turbine, a heating pipe is led out , and then introduce the steam into the heat exchange device of the heat network or the heat user, thereby increasing the heat supply capacity of the unit. After the optical shaft heating transformation, since the gas in the low-pressure cylinder rubs against the rotating optical shaft to generate heat, it needs to be cooled by special steam to ensure the safety of ...

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Problems solved by technology

[0003] In order to solve the shortcomings of the above problems, a method for transforming the condensing steam turbine into a back pressure steam turbine is provided, which can not only increase the heat supply capacity of the unit, ensure that the external heat supply requirements are met, but also solve the problem of the high cost of replacing the new rotor and the Complicated problems of low-pressure rotor cooling system

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