Full natural-circulating air cooling tower

Abstract

The invention relates to a heat exchange device, in particular to a full natural circulation air cooling tower used in an atmospheric pressure nuclear heat supply reactor. The full natural circulation air cooling tower includes a tower body and heat transfer tubes arranged in the tower body, a chimney is arranged on the upper part of the tower body, and an ascending pipe connected with the heat pipe section of the secondary loop of the atmospheric pressure reactor is also arranged in the tower body, and the top of the ascending pipe An expansion tank is provided, the expansion tank is connected to the heat transfer tube, the lower part of the heat transfer tube is connected to a water tank, and the lower part of the water tank is connected to the cold pipe section of the secondary circuit of the atmospheric pressure reactor. The structural features of the present invention effectively increase the natural circulation capacity of the water side to ensure that the decay heat of the primary circuit is brought out at a fast enough speed, and at the same time improve the reasonable natural circulation capacity of the air side to ensure that the heat is brought to the atmosphere for a long time middle.

Description

technical field [0001] The invention relates to a heat exchange device, in particular to a full natural circulation air cooling tower used in an atmospheric pressure nuclear heat supply reactor. Background technique [0002] With the rapid development of the world economy, the lack of water resources has caused widespread concern in the world, and it is an advisable way to use the inexhaustible seawater resources as a supplement to human water resources for survival. For this reason, countries all over the world have begun to use nuclear energy for seawater desalination research and exploration for many years, but it has not yet been widely used commercially. It is safe to pay high construction and operation costs and expensive seawater desalination facilities using special materials, so that the price of freshwater production cannot compete with the market, which restricts its development. At present, a certain-scale low-temperature multi-effect distillation seawater desal...

AI Technical Summary

Problems solved by technology

Traditional cooling towers are mostly used to cool water or steam at higher temperatures, and adopt forced circulation and add spraying devices. The equipment is complex and expensive

For water with a cooling temperature of about 100°C (such as atmospheric reactors, industrial boilers, etc.), the conventional cooling tower design will not be able to meet the requirements of practical industrial applications.

The reasons are mainly manifested in two aspects: First, the heat transfer tubes of conventional air cooling towers are mostly arranged at the bottom of the tower body, and the air side circulation power is to increase the wind speed through power equipment such as fans, and increase the air humidity through spraying to enhance heat transfer , the water side circulation can only provide the dynamic pressure head through the pump. The disadvantage of this design structure is that it not only increases the equipment and thus increases the cost, but also cannot meet the passive characteristic requirements required by the atmospheric pressure reactor; the second is that for normal temperature and pressure As far as the stack is concerned, due to the low temperature of the water, the traditional cooling tower design structure will cause the heat transfer area in the cooling tower to be too large and the volume of the cooling tower will be too large, resulting in high cost and unable to meet the cost requirements of commercial operation

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