Online monitoring device and method for temperature field of indirect air cooling system

Abstract

The invention discloses an online monitoring device for a temperature field of an indirect air cooling system. The device comprises a plurality of temperature measuring cables,a plurality of temperature measuring sensors,a collecting device and a monitoring host,wherein the temperature measuring cables are arranged on the parts,located on the outer surfaces of pipe bundles of heat dissipating devices of cooling triangles,of the windward faces of the cooling triangles of the indirect air cooling system,one temperature measuring cable is arranged on one windward face of a single cooling triangle,and the temperature measuring cables on two windward faces of a single cooling triangle are arranged on the same horizontal plane,the temperature sensors are correspondingly arranged on a plurality of temperature measuring points of the temperature measuring cables at certain intervals,the collecting device is connected with the temperature measuring cables,and the monitoring host is connected with the collecting device. The invention further discloses an online monitoring method for the temperature field of the indirect air cooling system. The method and the device have the advantages that digital intelligent temperature sensors are used,a bus technology is adopted,an integrated online monitoring device of a temperature field containing multiple temperature measuring points is constructed,the arrangement of multiple points and multiple rows is adopted,and multi-point large-area temperature monitoring is achieved to facilitate the anti-freezing operation of the indirect air cooling system.

Description

technical field [0001] The invention relates to the technical field of indirect air cooling in thermal power plants, in particular to an on-line monitoring device and method for the temperature field of an indirect air cooling system. Background technique [0002] The process flow of the indirect air cooling system is as follows: the circulating water enters the water side of the surface condenser through surface heat exchange, cools the exhaust steam of the steam turbine on the steam side of the condenser, and the heated circulating water is pumped by the circulating water to the air cooling tower, and passed through the air cooling tower. The radiator exchanges heat with the air on the surface, and the circulating water is cooled by the air and then returns to the condenser to cool the exhaust steam of the steam turbine, forming a closed cycle. The indirect air-cooling system can meet the high-quality requirements of large-capacity units for boiler feed water. The system ...

AI Technical Summary

Problems solved by technology

And these areas are cold in winter at the same time, and the air cooling system is prone to freezing during the wintering process

Especially for the indirect air cooling system, the working medium flowing in the tube bundle is liquid water. Once a freezing failure occurs, the cooling tube will inevitably crack and the consequences will be serious.

When the ambient temperature is lower than 0°C in winter, it is easy to freeze, damage the tube bundle, cause leakage, and affect the safety and economy of the unit

[0004] Antifreezing of the indirect air cooling system is a very important task for the operation of the unit. At present, methods such as covering, manual inspection, and increasing back pressure are used, which not only consume manpower and financial resources, but also have poor real-time performance, which affects the efficiency of the unit.

Commonly used temperature measurement methods in the industry include thermocouples and thermal resistances. Due to the complexity of their installation, they are not suitable for multi-point temperature monitoring of indirect air-cooling systems. There are only a few measurement points for inlet and return water temperatures, which do not meet the needs of antifreeze.

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