Indirect air cooling system and indirect air cooling method for supercritical machine set or ultra-supercritical machine set

Abstract

The invention provides an indirect air cooling system and an indirect air cooling method for a supercritical machine set or an ultra-supercritical machine set. The indirect air cooling system comprises a steel injection type condenser for enabling waste steam and cooling water to perform direct contact mixing and heat exchange with each other, a circulating water pump group for boosting pressure of the heated cooling water so as to obtain pressure-boosting cooling water, a steel radiator, a water turbine and a water supply system running by adopting alkaline water working conditions, wherein the steel radiator is used for performing heat convection cooling to the pressure-boosting cooling water and the air so as to obtain the cooling water; the water turbine is used for performing pressure adjustment to the cooling water during the process of conveying the cooling water to the steel injection type condenser and is used for recycling energy simultaneously; and the water supply system is connected with the steel injection type condenser and is used for supplementing the cooling water. The indirect air cooling system and the indirect air cooling method enable the injection type condenser to adopt ordinary alkaline water, the technical problem that a Heller indirect air cooling system is difficult in application to the supercritical machine set of over 300MW is solved, a water quality control system is simple and practicable, and investment of a water treatment system is reduced.

Description

technical field [0001] The invention relates to a cooling system of a steam turbine generator set, in particular to a JCST (Jet Condenser steel exchangers, jet condenser combined with a steel radiator) used for cooling the end of a steam turbine set in a supercritical or ultra-supercritical thermal power plant ) indirect air cooling system and method. Background technique [0002] The cooling technology of the steam turbine generator set includes wet cooling technology and air cooling technology. The wet cooling technology is that the radiator is mainly cooled by water. According to statistics, the water consumption of a 1000MW wet cooling unit is as high as 2200m3 / h, which limits my country's "three The development of the power industry in the water-scarce areas of the North ″. [0003] The air-cooling technology is that the radiator is mainly cooled by air, which is a new technology with remarkable water-saving effect. If the air-cooling technology is adopted, the thermal ...

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Problems solved by technology

[0012] The object of the present invention is to provide an indirect air cooling system and method for a supercritical unit or an ultra-supercritical unit, which can make the jet condenser use ordinary alkaline water and solve the problem of high water quality and thermal The technical problem of low cycle efficiency

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