Anti-freezing device for air cooling island in power station

Abstract

The invention relates to exhaust-steam cooling equipment for a steam turbine in the power industry, in particular to an anti-freezing device for an air cooling island in a direct air cooling unit of a power station. The device includes an air cooling island condensation water header (1), a steam calandria radiator (2) and a steam distributing pipe device (3). The device is characterized in that fixed wind shields (5) and (6) are mounted on the periphery at an air outlet side of the air cooling island steam calandria radiator, and a louver-type shield device (4) is mounted above the steam calandria radiator. The device is characterized in that the structure is simple, the adjustment is flexible and convenient, and the response speed is high, solves the defects that the present air cooling island is incapable of adjusting heat preservation manually and the switch response speed of an electric rolling door is lower, further can prevent the problem that the windward side of the air cooling island is frozen easily in freeze-up, and completely solves the difficulties that the air cooling island is frozen to damage and the heat impact causes equipment damage when the standby equipment in freeze-up is put into operation.

Description

Technical field [0001] The invention relates to exhaust steam cooling equipment for steam turbines in the electric power industry, in particular to an antifreeze device for an air-cooled island of a direct air-cooled unit in a power station. Background technique [0002] In the water-deficient areas in northern my country, the method of direct air cooling steam turbine exhaust steam has been widely adopted by various power stations. This requires the construction of several rows of air-cooled islands according to the capacity of the generator set, and each row of air-cooled islands usually uses a steam pipe radiator. The working principle of the air-cooled island is that the exhaust steam discharged from the steam turbine is distributed to the steam distribution pipe devices of each row of air-cooled islands after passing through the steam exhaust main pipe, and is shunted by the latter into the steam-pipe radiator of the air-cooled island. The outside air flows through the...

AI Technical Summary

Problems solved by technology

Measures 1 and 2 have defects such as high labor intensity, easy to be blown off by the wind, and inability to adjust

Measure 2 is more flexible, but because it is suspended in the air, it is very inconvenient to install, repair, operate and maintain; and because the length and width of the rolling shutter door are about 10m, it takes a long time to fully open to fully close, and the response speed is slow. It cannot meet the operation requirements of some special working conditions of the unit; Another potential problem of measure 2 is that during the severe cold period and strong wind, the air on the windward side of the air-cooled island is easy to flow back and then flow out from the leeward side, and the actual cooling air volume of the air-cooled island is relatively large, which is prone to freezing Phenomenon

Measure 3 Because the diameter of the exhaust steam access pipeline is usually large, the tightness of the large-diameter steam isolation valve installed on the pipeline cannot be guaranteed technically, so it is often faced with steam leaking into the air-cooling island and freezing, resulting in steam pipe type Radiator freezing problem

In addition, the temperature of the air-cooled island shut down by measure 3 is very low during the severe cold period, and the metal brittleness increases. Once the unit needs to be put into operation quickly, the metal temperature rises rapidly, and it is easy to cause steam distribution due to excessive expansion and uneven expansion. Fractures at the ends of the tanks or steam distribution pipes, which have occurred several times in the plant concerned

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