Antifreeze system and method for direct air cooling unit

Abstract

The invention provides an anti-freezing system and method for a direct air-cooling unit. The anti-freezing system comprises a turbine, an electric generator and an air cooling island system. The turbine and the electric generator are connected through a coupler. A steam exhaust opening of the turbine is connected with the air cooling island system. The air cooling island system comprises six rows of air cooling condenser systems of the same structure. By means of the pressure measuring point and the temperature measuring point, automatic control over an air-cooling fan by the super-cooling degree of condensed water is achieved, thus, back pressure of the unit is effectively controlled, after a PID controller is utilized for controlling the rotating speed of the fan, the requirement of the back pressure of the unit and the anti-freezing protection requirement of an air-cooling island can be met, meanwhile, the power consumption rate of the fan can be reduced, the power utilization rate of a power plant is reduced, and the purposes of energy saving and efficiency improving are achieved on the premise of ensuring that the unit is safe and reliable.

Description

technical field [0001] The invention relates to an antifreeze system, in particular to an antifreeze system and method for a direct air cooling unit. Background technique [0002] At present, due to the generally low load rate of thermal power units and their participation in peak regulation and voltage regulation, the operating conditions of the units have further deteriorated. For direct air-cooled units, the reduction in exhaust steam under low-load conditions in winter makes the antifreeze protection of the air-cooled island more and more effective. The more important it is, under the current logic of air-cooling antifreeze protection, many direct air-cooling units in China have suffered accidents such as tube bundle cracking and fin deformation in the air-cooling heat exchange units, and the recovery cycle and other methods have not effectively alleviated the freezing and freezing of air-cooling islands. , the existing antifreeze protection has hysteresis. Due to the an...

AI Technical Summary

Problems solved by technology

[0002] At present, due to the generally low load rate of thermal power units and their participation in peak regulation and voltage regulation, the operating conditions of the units have further deteriorated. For direct air-cooled units, the reduction in exhaust steam under low-load conditions in winter makes the antifreeze protection of the air-cooled island more and more effective. The more important it is, under the current logic of air-cooling antifreeze protection, many direct air-cooling units in China have suffered accidents such as tube bundle cracking and fin deformation in the air-cooling heat exchange units, and the recovery cycle and other methods have not effectively alleviated the freezing and freezing of air-cooling islands. , the existing antifreeze protection has hysteresis, forced by the antifreeze pressure of the air-cooled island, the back pressure control of the direct air-cooled unit is relatively high in winter, and the economic efficiency of the unit has dropped significantly

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