All-working-condition cooling and anti-freezing system suitable for indirect air-cooling heat supply unit

Abstract

The invention discloses an all-working-condition cooling and anti-freezing system suitable for an indirect air-cooling heat supply unit. The system involves a steam turbine low-pressure cylinder, an indirect air cooling tower, a condenser, a circulating water pump, diverting coolers, steam-water pipeline valves and the like; and the system is characterized in that the independent diverting coolersconnected with the indirect air cooling tower in parallel are additionally arranged on the indirect air-cooling heat supply unit, the pipeline valves from an outlet of the circulating water pump to the diverting coolers are additionally arranged, after the circulating water is cooled by the diverting coolers, the circulating water and circulating water outlet water of the indirect air cooling tower are converged and then enter the condenser together to cool exhaust steam of a steam turbine; and when the unit operates under the pure condensing working condition, the indirect air cooling towerand the diverting coolers operate in parallel, and a corresponding number of diverting coolers can be put in according to unit operation requirements. According to the system, through implementation of the all-working-condition cooling and anti-freezing system suitable for the indirect air-cooling heat supply unit, the annual cooling requirement of the indirect air-cooling heat supply unit can bemet, the anti-freezing purpose under the working condition of small steam exhaust flow can be achieved, and the safety and economical efficiency of unit operation can be improved.

Description

technical field [0001] The invention belongs to the field of power plant boiler and steam turbine systems, and in particular relates to a cooling and antifreezing system suitable for all working conditions of an indirect air-cooled heating unit. Background technique [0002] The electric power industry is not only a large consumer of primary energy, but also consumes a large amount of water resources. China is a country that is very scarce in water resources, and its per capita water resources are less than a quarter of the world's average level. With the optimization of energy structure and the transformation of production and utilization methods, air-cooling technology has gradually attracted attention due to its superior water-saving performance. Especially in my country's coal-rich and water-scarce areas, direct and indirect air-cooling units have developed rapidly. Compared with the direct air-cooling system, the indirect air-cooling system has the advantages of less p...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a cooling and antifreeze system suitable for all working conditions of the indirect air-cooled heating unit. By adding an independent split cooler and related pipeline valves to the indirect air-cooled heating unit in parallel with the indirect air-cooling tower, it can meet the requirements of the indirect air cooling system. The annual cooling demand of the air-cooled heating unit and the solution to the antifreeze problem under the condition of small exhaust steam flow improve the safety and economy of unit operation and have great energy-saving potential

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