Automatic deicing control method of cooling tower fan

Abstract

The invention provides an automatic deicing control method of a cooling tower fan, which comprises the following steps: (1) after the timer of a PLC finishes the preparation work for deicing, starting to detect the operating state of the fan, wherein the operating state comprises a high speed running state, a low speed running state and a stop state; (2) if the operating state is the high speed running state, shutting down the fan, delaying for a period of time, and carrying out the next step; if the operating state is the low speed running state, shutting down the fan, delaying for a period of time, and carrying out the next step; if the operating state is the stop state, directly carrying out the next step; (3) carrying out the low-speed reverse rotation deicing for a period of time by using the control system, and carrying out the next step; (4) shutting down the control system, delaying for a period of time and carrying out the next step; (5) switching the control system to the original operating state, and starting the next step; and (6) and while the timer of the PLC waits for the next deicing, returning to step (1). The method can automatically deice for the cooling tower in cold climate, and has the advantage of low cost for operation and maintenance.

Description

technical field [0001] The invention relates to an automatic deicing system for a fan of a cooling tower in a cold area. Background technique [0002] In the iron and steel metallurgy industry, the cooling tower is an indispensable heat exchange equipment in the circulating water treatment system. However, in cold regions, especially in winter, the fan of the cooling tower freezes seriously before operation, which brings many difficulties to safe production and operation and maintenance. In the cold regions of our country, the local freezing period can reach more than 5 months every year, and the lowest temperature can reach minus 40°C. In winter, severe ice builds up on the louvers of the air inlet of the cooling tower, making the entire louver form an ice curtain, which almost closes the air inlet and outlet, resulting in a decrease in the area of ​​the air inlet and outlet, and a decrease in the amount of air in and out, which affects the cooling effect of the tower. In ...

AI Technical Summary

Problems solved by technology

In winter, severe ice builds up on the louvers of the air inlet of the cooling tower, making the entire louver form an ice curtain, which almost closes the air inlet and outlet, resulting in a decrease in the area of ​​the air inlet and outlet, and a decrease in the amount of air in and out, which affects the cooling effect of the tower. In addition, the ice curtain It may be thrown out during the operation of the motor, and there are serious safety hazards

In order to ensure the normal operation and cooling effect of the cooling tower, the usual method is to let the operator dig ice, but it may be damaged together with the shutters during the ice digging process, resulting in a great waste of manpower and material resources

At the coldest time, it will even freeze the filler, which will affect the efficiency of the filler and the cooling effect of the tower after the filler freezes.

What's more, the increased ice load after freezing may cause structural deformation and collapse of the cooling tower

At present, the common anti-icing methods for cooling towers in the market include installing anti-freezing pipes, spray pipes, etc., but these all need to increase the construction, operation and maintenance costs of cooling towers

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