Online thickness monitoring device and method for accumulated dust in bottom of horizontal flue

Abstract

The invention provides an online thickness monitoring device and method for accumulated dust in the bottom of a horizontal flue. The monitoring device comprises a measuring plate and a reference platehorizontally mounted in the centroids of the lower and upper wall surfaces of the horizontal flue respectively, and the size and heating power of the measuring plate are the same with those of the reference plate correspondingly; the measuring plate comprises a measuring plate sensor, a measuring plate heater, a measuring plate heat insulating plate, a measuring plate compensating heater and a measuring plate compensation temperature sensor from top to bottom; the reference plate comprises a reference plate temperature sensor, a reference plate heater, a reference plate heat insulating plate,a reference plate compensating heater and a reference plate compensation temperature sensor from bottom to top; all the temperature sensors are connected with a signal collection controller. The system structure and algorithm are simple, a measurement result can visually reflected the thickness of accumulated dust in the bottom of the channel, namely, the flue, the method based on temperature difference of the measuring plate can eliminate influence of environment condition and air-flow temperature, and temperature data of a window within a period is used, so that a random error of temperature measurement is avoided, and data is more stable and reliable.

Description

technical field [0001] The invention is a method and device proposed for the on-line monitoring of the ash thickness on the bottom of the horizontal flue of a coal-fired boiler and the catalyst surface of a denitrification device, and relates to the safe, low-resistance and high-efficiency operation of the smoke exhaust system of a coal-fired power plant. The method is also suitable for online monitoring of the deposition thickness of other solid particles at the bottom of the horizontal channel. Background technique [0002] After the coal is burned in the boiler, a large amount of solid particles will be produced. If these particles are not dealt with, they will cause rapid wear of the induced draft fan, and will cause environmental pollution when they are discharged into the atmosphere. Therefore, various dust removal measures will be taken in the flue gas passage of the boiler, such as cyclone dust removal, electrostatic dust removal or bag dust removal. After the exha...

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Problems solved by technology

Among them, the laser ranging method will fail due to the pollution caused by the long-term operation of the transmitting and receiving devices. The ultrasonic ranging method is limited by the resolution, and the environmental interference factors are difficult to exclude, and the influence factors of the airflow pressure difference and the wall stress (strain) signal Too many, unable to meet the needs of online monitoring

[0004] At present, there is no recognized and mature method and device that can be used for on-line monitoring of the thickness of ash deposits in horizontal channels

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