Series connection type air humidity mixed cooling system, air cooling island system and cooling method

Abstract

The invention discloses a series connection type air humidity mixed cooling system and an air cooling island system in order to solve the problems that in the thermal power generation field, pipelinebackpressure is high, and cooling efficiency is low. The series connection type air humidity mixed cooling system comprises a steam distribution pipeline, a water-steam separation pipeline, a co-flowair cooling heat radiator, a condensation water collection pipeline and a residual air collection pipeline. The invention further discloses a cooling method. The cooling method comprises the air cooling step and the water-steam separation step. The adverse flow area in a traditional air cooling island is omitted, the original adverse flow area is modified into a co-flow area, the heat transfer effect of the air cooling heat radiator is improved, and the resistance of the air cooling heat radiator is reduced; and the structure of the air cooling heat radiator is simplified, the air cooling heatradiator is only provided with a co-flow area pipe bundle, the resistance characteristic of the air cooling heat radiator is improved, and flow resistance distribution of the steam-water side is optimized.

Description

technical field [0001] The present invention relates to the field of thermal power generation, and further relates to the field of steam cooling of thermal power generation, in particular to a serial air-humidity mixed cooling system, an air-cooling island system and a cooling method. Background technique [0002] The air-cooled island system is an important part of the steam-water system of a thermal power plant. It is a mechanism that condenses the steam that has done work in the steam turbine 4 and keeps the steam turbine 4 vacuum through air cooling. [0003] Refer to attached figure 1 , the current common air-cooled island system includes a forward flow radiator 1 and a counterflow radiator 2 connected in series, the forward flow radiator 1 includes a number of parallel flow tube bundles, and the counterflow radiator 2 includes a number of parallel flow tube bundles The countercurrent tube bundle is blown by the axial fan to the two sets of radiators to cool the steam....

AI Technical Summary

Problems solved by technology

[0004] In the existing air-cooled island system, due to the differences in the resistance characteristics and heat transfer characteristics of the pipes in the downstream and counter-flow pipe bundles, coupled with the differences in pipe design, manufacturing, and installation processes, as well as the external environmental wind, axial flow, etc. Due to various factors such as fan operation mode and contamination, when the system is running, the distribution of steam flow field and temperature field is obviously uneven, which leads to an increase in the back pressure of the system and affects the efficiency of the unit

The existing improvement measures in the vacuum system, such as Roots vacuum pump, cannot fundamentally improve the flow field and heat load distribution characteristics of the air-cooled island itself, and the energy-saving effect is not obvious

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