Automatic anti-freezing device for power station direct air cooling unit based on louver wind shield

Abstract

The invention relates to an automatic anti-freezing device for a power station direct air cooling unit based on a louver wind shield. The automatic anti-freezing device comprises temperature-measuringcables, temperature measuring points, a data monitoring and processing unit, an automatic executing mechanism and the louver wind shield. The louver wind shield is mounted at an air inlet of an air cooling fan. The multiple temperature-measuring cables are arranged on the air outlet face sides of fin radiating tube bundles, each temperature-measuring cable is internally provided with the three corresponding temperature measuring points at equal distances and connected with an input channel of the data monitoring and processing unit. When the displayed temperature of any one of the temperaturemeasuring points is excessively low, the data monitoring and processing unit judges the specific position immediately, the automatic executing mechanism closes the louver wind shield of a corresponding air cooling unit body, and thus cold air is cut off. The automatic anti-freezing device has the advantages of simple structure, low cost, short stroke time and significant air-blocking effect, theproblem that the fin radiating tube bundles of an air cooling island are frozen in winter can be effectively solved, the back pressure in winter can be reduced by about one KPa, and the heat economy of the unit is improved by 1%-2%.

Description

technical field [0001] The invention relates to an automatic antifreeze device for an air-cooled island of a direct air-cooled unit in winter, which is suitable for the antifreeze field of an air-cooled island of a thermal power plant in a severe cold area, and can also be applied in other related or similar fields. Background technique [0002] my country's three northern regions are rich in coal and lack water. In order to solve the problem of water shortage, many large-capacity direct air-cooling units have emerged. At present, the installed capacity of direct air-cooling units in my country exceeds 200 million kilowatts, and the largest single unit capacity is Huadian Lingwu Power Plant. Critical direct air cooling unit. Compared with conventional wet-cooling units, direct air-cooling units can save more than 70% of water, which greatly alleviates the problem of water shortage in my country. However, the direct air-cooling unit is greatly affected by the environment, and...

AI Technical Summary

Problems solved by technology

In terms of isolating cold air, the methods adopted include: covering the surface of the finned heat dissipation tube bundle with an insulating layer, but this method is cumbersome and difficult to implement repeatedly; installing a rolling door or a folding net at the air inlet of the air-cooling fan, this method can effectively isolate cold air, but Rolling shutter doors and folding nets take a long time to travel; arranging windshields at the air outlet of the finned heat dissipation tube bundle and around them can also effectively isolate cold air, but the investment is large, the construction volume is large, and there is no effective and accurate temperature measurement method; The temperature measurement system is connected with the simple and quick means of wind isolation, and realizes the automatic identification of freezing risk and the automatic opening and closing operation of the windshield, which will more effectively play the antifreeze effect of the air cooling island and further reduce the back pressure of the unit operation, improve the thermal efficiency of the unit

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