Online monitoring method for freezing state of air-cooling island

Abstract

The invention provides an online monitoring method for the freezing state of an air-cooling island. The online monitoring method comprises an air-cooling island freezing state monitoring system and anair-cooling unit freezing prediction method, wherein a hardware part of the air-cooling island freezing state monitoring system comprises a steam turbine exhaust pipeline, each air cooling unit temperature measuring point system, a monitoring data measuring device, a data processing server and a monitoring platform; and a software part of the air-cooling island freezing state monitoring system comprises freezing coefficients and the parameter real-time computing of the condensed water subcooling degree. The invention provides a supply and demand heat transfer balance-based freezing coefficient computing method based on a freezing state online monitoring system of an air cooling unit. By comparing the heat transfer capability of a heat release side and a heat absorption side, the tendencyand degree of freezing of a heat exchange tube bundle can be predicted in essence; and a composite freezing pre-warning system based on the freezing coefficients of supply and demand heat transfer balance, the condensed water subcooling degree and the vacuum pumping temperature of a countercurrent section effectively improves the accuracy and operational flexibility of the anti-freezing adjustmentof a unit and guarantees the safety and high efficiency of the operation of the unit in winter.

Description

technical field [0001] The invention relates to the technical field of energy and power, in particular to an online monitoring method for the freezing state of an air-cooled island. Background technique [0002] At present, large-scale direct air-cooled generating units have been widely used in northern China, and direct air-cooled condensers mostly use axial flow fans to drive ambient air to cool the exhaust steam of steam turbines. In most parts of northern my country, there is a huge difference in temperature between winter and summer and between day and night, and the lowest temperature in winter can be as low as minus 40°C. Since many power plants select a large cooling area of ​​the condenser at the beginning of the design in order to ensure the full power generation of the unit in summer, this brings great challenges to the anti-freezing operation in winter, especially when the unit is started, shut down and low-load in winter. During operation, the condenser tube bu...

AI Technical Summary

Problems solved by technology

However, it often occurs that when the temperature measuring instrument of the existing system shows that the temperature of the monitoring part is abnormal, the cooling tube bundle has been severely frozen, and it is impossible to accurately and quickly provide real-time information on the freezing condition of the condenser.

Moreover, the existing direct air-cooling system has limited temperature measuring points, and the arrangement of measuring points is not targeted, so it seems powerless to monitor the partial freezing of individual air-cooling units in the air-cooling island

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