Column-by-column anti-freezing cooling unit capable of realizing air-side flow self-equalizing for indirect cooling tower

Abstract

The invention discloses a column-by-column anti-freezing cooling unit capable of realizing air-side flow self-equalizing for an indirect cooling tower. Shutters, flow equalizing flat plates and heat dissipating and cooling columns form two air flow passages. A first flow equalizing flat plate is inserted into a cavity of the cooling unit, has a reserved certain distance away from an inner end point thereof and outwards extends along a symmetry plane thereof; a second flow equalizing flat plate and a third flow equalizing flat plate are respectively arranged at inner side inflection points of outer end surfaces of two cooling columns and outwards extend to a radial straight line of the indirect cooling tower through outer side inflection points of outer end surfaces of corresponding cooling columns; two shutters are respectively hinged to air inlets of the two air flow passages of the cooling unit. The column-by-column anti-freezing cooling unit capable of realizing air-side flow self-equalizing for the indirect cooling tower has the advantages that the adverse influence of inlet air deviation on a certain cooling column in the cooling unit is reduced by using the flow equalizing flat plates through two structurally symmetrical air flow passages with air inlet volume which can be separately adjusted, the ventilation amount of the two cooling columns is balanced, the overall performance of the cooling unit is improved, the separate adjustment is realized by using a certain shutter, the certain cooling column is prevented from being partially super-cooled, frozen or frost-cracked, and the operating safety of the cooling unit is guaranteed.

Description

technical field [0001] The invention belongs to the field of indirect air cooling in thermal / nuclear power plants, and in particular relates to a split-column anti-freezing cooling unit for an indirect cooling tower with self-equalizing flow on the gas side. Background technique [0002] As my country's water resources management system becomes increasingly strict, indirect air cooling towers, as a cooling method for thermal / nuclear power plants, are gradually used in arid and water-scarce regions such as Northwest my country and North China. Usually, the circulating water in the indirect air cooling tower transfers heat to the ambient air through the cooling triangular radiator in the form of convective heat exchange. Therefore, its cooling limit is the dry bulb temperature of the ambient air, and its cooling capacity is relatively low, especially in hot summer conditions, which can easily lead to insufficient output of indirect air-cooled power plants. At the same time, b...

AI Technical Summary

Problems solved by technology

According to the results of the air flow field structure and outlet water temperature distribution of the third sector 17 under the above-mentioned 4m / s ambient crosswind, in the second sector and the fourth sector with large air intake deviation in the cooling triangle, the 4m The / s ambient crosswind will also be at θ -1 The air inlet side of the cooling column 9 causes a low-speed air vortex area, which in turn reduces its air inlet velocity and reduces its ventilation volume, thereby weakening θ -1 cooling performance of the cooling column 9, and ultimately cause θ -1 The tower water temperature of the cooling column 9 rises obviously, which also weakens the overall cooling performance of the corresponding cooling triangle

[0009] Due to the imbalance of the outlet water temperature of the two cooling columns in the same cooling unit caused by the side wind of the environment, it is very easy for a certain cooling column in the cooling unit to be partially overcooled and cause the cooling tube bundle to freeze under the condition of low ambient temperature in winter

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