An online soft-sensing method for the air intake volume of the cooling fan section of an indirect air-cooling tower

Abstract

The invention discloses an online soft measurement method for a supply air rate of a cooling fan section of an indirect air-cooling tower. The online soft measurement method comprises the following steps: (1) acquiring heat exchange coefficients k f of a cooling triangular heat sink of an indirect air-cooling system as a researched object; (2) sorting out windward area A n and heat exchange area A o of the fan section according to a structural size provided by a power plant; (3) reading a related temperature such as the temperature after air enters the cooling fan section according to a temperature measuring point; and (4) calculating the wind speed v n, of an inlet of the fan section on the basis of a heat transfer theory mathematical theory model, and then giving out the supply air rate of the fan section. The wind speeds of air inlets of various fan sections of an indirect air-cooling system can be controlled, and the method has quite important practical significance and high practical value on economical and safe running of the whole indirect air-cooling system, particularly prevention of winter freezing accidents of the heat sink of the indirect air-cooling system.

Description

technical field [0001] The invention relates to an online soft measurement method for the air intake volume of a cooling sector of an indirect air cooling tower, in particular to a method for calculating the air volume of air entering each sector of an indirect air cooling system based on a mathematical theoretical model of heat transfer, and belongs to the technical field of online monitoring. Background technique [0002] The indirect air-cooling system has gradually been widely used in my country's "coal-rich and water-shortage" areas due to its characteristics of saving water and electricity, and low unit coal consumption. The operating characteristics of the indirect air-cooling tower determine that it is easily disturbed by the external environment, and a series of problems also occur during operation, such as insufficient cooling output in summer and freezing of radiators in winter, which seriously affect the economy and safety of unit operation. Realizing the online ...

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Problems solved by technology

[0003] In addition, for each cooling segment of an indirect air-cooling tower, the flow field at the inlet of the fan segment is relatively complex, and the flow velocity at a certain point changes frequently and is greatly affected by the change of the flow field. It is difficult to directly and accurately measure the windward wind speed and Air intake

In addition, there are doubts about the layout of the measuring points. Where to arrange the measuring points can best reflect the windward air intake conditions of the sector. It is difficult to measure the windward wind speed or air intake volume of the indirect air cooling tower with existing instruments

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