Low-pressure cylinder module system of double-back-pressure asymmetric turbine and operation method of low-pressure cylinder module system

Abstract

The invention relates to a dual-backpressure asymmetric steam turbine low-pressure cylinder module system and its operating method. The system includes a low-pressure cylinder installed on the steam turbine platform, a high-backpressure surface condenser connected to the low-pressure cylinder, and a high-backpressure surface condenser installed on the low-pressure cylinder. The internal short final stage blade set is installed on the low-pressure cylinder of the steam turbine platform, the low back pressure surface condenser connected to the low-pressure cylinder, the long final-stage blade set installed inside the low-pressure cylinder, and the medium-low The cylinder pressure connecting pipe, the circulating water pipe installed at the circulating water inlet of the low back pressure condenser, the circulating water pipe installed at the circulating water outlet pipe of the high back pressure condenser; the exhaust steam of the medium pressure cylinder of the steam turbine passes through the medium and low pressure connecting pipe Enter the first low-pressure cylinder and the second low-pressure cylinder respectively, and after doing work in the first low-pressure cylinder and the second low-pressure cylinder, the steam is respectively discharged into the high back pressure surface condenser and the low back pressure surface condenser for surface heat exchange .

Description

technical field [0001] The invention relates to the technical field of energy recovery and utilization of cooling towers, in particular to a dual-backpressure asymmetric steam turbine low-pressure cylinder module system and an operating method thereof. Background technique [0002] For a thermal power generation unit, every 1kPa reduction in the back pressure of the steam turbine will reduce the coal consumption of the unit by about 1.0-3.0g / (kW h), so reducing the back pressure of the steam turbine will significantly improve the power generation efficiency; longer final blades can be applied to lower The exhaust back pressure of the unit can improve the power generation efficiency of the unit. [0003] At present, the low-pressure cylinder modules of thermal power double back pressure units generally adopt a symmetrical system, that is, the low-pressure cylinders are arranged geometrically and symmetrically. Although double back pressure condensers are used, different back...

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Problems solved by technology

For the double back pressure unit, when the same low-pressure cylinder module is used, the final-stage blades of the low-pressure cylinder are symmetrically arranged, and the same length of the last-stage blade group cannot be optimally matched with different back pressures at the same time, because the difference between the double-back pressure units is different. The effect of back pressure cannot be fully exerted

[0005] In addition, when the double back pressure unit adopts the symmetrical low-pressure cylinder module and the final stage blades of the same length grade, it is difficult to balance the working conditions of the final stage blades on both sides, and the working condition of the blade group on one side is prone to deterioration

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