A kind of antifreeze control method of indirect air cooling system

Abstract

The invention relates to an antifreezing control method of an indirect air cooling system. The antifreezing control method is characterized in that a fiber bragg grating temperature detecting device (3) is additionally arranged on cooling triangles (1-1), so that each cooling triangle (1-1) is provided with a plurality of grating sensors (3-2); the water outlet temperature value of each louver action unit is calculated after the water outlet temperature detecting values of the cooling triangles (1-1) are collected; and when the water outlet temperature values are smaller than or equal to the minimum water outlet temperature specified value, an antifreezing protection program is started. Water temperature control over an existing cooling sector is changed to water temperature control over the louver action units (the one or two cooling triangles 1-1), the uniformity of the water outlet temperatures of the whole air cooling system is improved, and the operation back pressure of a steam turbine condenser is reduced under the condition that the winter antifreezing requirement is met.

Description

technical field [0001] The invention provides an antifreeze control method for an indirect air cooling system, which is mainly used for the control of the indirect air cooling systems of thermal power plants and chemical enterprises. Background technique [0002] In thermal power generation or chemical enterprises, the steam (also known as exhaust steam) after working in the steam turbine (or turbine) needs to be discharged into the condenser to condense into water, and then returned to the boiler for recycling. The system (device) that takes away the heat of the condenser through the circulating water, makes the circulating water exchange heat with the cold air in the air-cooled radiator, and finally releases the heat to the atmosphere, which is called an indirect air-cooling system. The indirect air cooling system is widely used in our country, mainly composed of air cooling radiator, cooling tower body, louvers and drive. The size of the indirect air-cooling system requi...

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Problems solved by technology

[0004] There are deficiencies in the existing antifreeze control methods: one cooling sector has multiple (much more than two) cooling triangles, and they share a set of water inlet and outlet pipes. The average outlet water temperature of the circulation level, all cooling triangular shutters are controlled only according to this outlet water temperature value, and the opening of all shutters is the same; however, affected by factors such as ambient wind and water distribution uniformity, the temperature of each cooling triangle in the entire cooling sector The difference in water temperature is too large; in order to avoid freezing accidents of the air-cooled radiator, the outlet water temperature of the cooling sector has to be increased, which eventually leads to an increase in the back pressure of the steam turbine and an increase in the coal consumption of the generator set

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