Online monitoring sensor for corrosion depth of heating surface of boiler

Abstract

The invention relates to an online monitoring sensor for the corrosion depth of a heating surface of a boiler. The sensor comprises a piece to be tested, a thermocouple, an air inlet pipe and a hollowcavity. Two ends of the hollow cavity are opened, and one end is arranged in a furnace wall of the boiler through a sealing flange. The air inlet pipe is disposed in the hollow cavity body, one end is opened, the other end which is not opened extends out of the furnace wall through the sealing flange, a part of the air inlet pipe outside the furnace wall is provided with an air inlet, and the sealing flange is provided with an air outlet. The piece to be tested is fixed in a sealed ceramic and is disposed at the opening at the other end of the hollow cavity, two ends of the piece to be testedare connected to a digital microhmmeter set outside the furnace wall through high-temperature resistant wires set in the air inlet piece, a test end of the thermocouple is mounted, the test end protrudes from the sealing ceramic, another end is sealed and fixed by the sealing flange, and the another end extends out of the furnace wall. The online monitoring sensor has the advantages of low cost and convenient and accurate measurement, the safe and stable operation of a heating surface is facilitated, and the nonstop of a unit caused by the corrosion and oxidation of the heating surface can bereduced.

Description

technical field [0001] The invention belongs to the field of boiler combustion diagnosis, and specifically relates to an online monitoring sensor for corrosion depth of a heating surface of a boiler, which is closely related to the safe operation of the boiler and is suitable for realizing the purpose of on-line monitoring of corrosion / oxidation of the heating surface during boiler operation. Background technique [0002] The heating surface of the boiler (water wall, superheater, reheater and economizer, also known as the "four tubes" of the boiler) is the key component in the boiler responsible for recovering the energy of coal-fired flue gas, heating steam, and realizing energy conversion. Among the failure causes of the "four tubes" of high-parameter utility boilers, the flue gas corrosion caused by pulverized coal combustion outside the furnace tube and the high-temperature steam oxidation inside the furnace tube play an important role, and they are also one of the essen...

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Problems solved by technology

[0004] In order to overcome the defects of the prior art, the object of the present invention is to provide an online monitoring sensor for the corrosion depth of the heating surface of the boiler for the problem of high-temperature flue gas corrosion / steam oxidation on the heating surface of the boiler in the power plant, so as to solve the problem that the boiler tubes of different materials cannot be measured. The problem of corrosion thinning can provide a basis for boiler combustion optimization and service performance evaluation of heating surfaces

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