System and method for preventing freezing of coal-fired wet cooling unit in winter and reducing back pressure of coal-fired wet cooling unit in summer

Abstract

The invention discloses a system and a method for preventing freezing of a coal-fired wet cooling unit in winter and reducing back pressure of the coal-fired wet cooling unit in summer. The system is characterized in that a new cooling system is connected in parallel in an original cooling system, so that the cooling system of the cooling unit has multiple modes to choose. A new cooling circulation system is mainly added, and a low-power circulating water pump is adopted, so that the cooling water flow is reduced, the lift of the low-power circulating water pump is ensured to be consistent with the lift of an original circulating water pump, and the cooling water temperature is increased; and meanwhile, when the heat load entering a condenser rises, the tower feeding mode is changed, and a cooling tower is fed again. After the system is adopted, the freezing prevention problem can be solved, part of circulating cooling water can enter the mechanical draft cooling tower when the environment temperature and the unit load are high in summer, the water spraying density of an original natural draft cooling tower is reduced, the temperature of water flowing out of the tower is reduced, the back pressure of the unit is reduced, and the economical efficiency of the unit is improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of energy saving and consumption reduction of coal-fired units, and in particular relates to a system and method for preventing freezing in winter and reducing back pressure in summer for coal-fired wet-cooling units. 【Background technique】 [0002] Winter antifreeze is a common problem for wet-cooled units in low-temperature areas in the north, especially for units with heating and low-pressure cylinders with zero output in winter. In the extreme cold region of Northeast China, the antifreeze problem of wet-cooled units cannot be completely solved. At the same time, the traditional antifreeze cannot further reduce the circulating water volume, resulting in high power consumption of the circulating pump in winter. A single antifreeze pipe does not have enough water to heat the cold air. In winter, the air inlet of the natural ventilation cooling tower freezes seriously. On the other hand, it is difficult t...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a system and method for antifreezing in winter and reducing back pressure in summer for coal-fired wet-cooling units, so as to solve the problem of serious freezing of natural ventilation cooling towers and high circulating water volume in the prior art. , the problem that the natural draft cooling tower is difficult to meet the cooling demand of the unit in summer

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