Direct air cooling temperature field on-line monitoring device and method

Abstract

The invention discloses a direct air cooling temperature field on-line monitoring device. The device comprises a plurality of temperature measuring cables A,a temperature measuring cable B,a pluralityof temperature sensors,a collector and a monitoring host,wherein the temperature measuring cables A are arranged on the outer side face of an air condenser at certain intervals and located on the outer surface of a direct system cooler pipe bundle connected with a direct air cooling system steam distributing pipe,the temperature measuring cable B is arranged at the outlet of a direct air coolingsystem fan on the inner side of the air condenser,the temperature measuring sensors are arranged on the temperature measuring cables A and the temperature measuring cable B at certain intervals,the collector is connected with the temperature measuring cables A and the temperature measuring cable B,and the monitoring host is connected with the collector. The invention also provides a direct air cooling temperature field on-line monitoring method. The direct air cooling temperature field on-line monitoring device and method have the advantages that by using the digital intelligent temperature sensors and adopting the bus technology,the integrated temperature field on-line monitoring device including a plurality of temperature measuring points is constructed,multi-point large-area temperaturemonitoring is realized,and the direct air cooling system anti-freezing work is facilitated.

Description

technical field [0001] The invention relates to the technical field of direct air cooling in thermal power plants, in particular to an online monitoring device and method for direct air cooling temperature field. Background technique [0002] The direct air cooling system is that the exhaust steam of the steam turbine is sent to the air-cooled condenser arranged outdoors through a thick exhaust pipe, and the axial flow cooling fan makes the air flow through the outer surface of the radiator, cooling the exhaust steam into water, and the condensed water is passed through The condensate is pumped back to the recuperation system of the steam turbine. The advantages of the direct air cooling system are less equipment, simple system, less infrastructure investment, less land occupation, and flexible air volume adjustment. The disadvantage is that it is difficult to seal the thick exhaust pipe during operation, it is difficult to maintain the vacuum in the exhaust pipe, and it ta...

AI Technical Summary

Problems solved by technology

The disadvantage is that it is difficult to seal the thick exhaust pipe during operation, it is difficult to maintain the vacuum in the exhaust pipe, and it takes a long time to vacuumize when starting

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

The antifreeze of the direct 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. The manual inspection workload is heavy, which not only consumes manpower and financial resources, but also has poor real-time performance, which affects the efficiency of the unit.

The 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 direct air cooling systems.

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