Intelligent deposited ash sampling device and method for online measurement of effective thermal conductivity of deposited ash

Abstract

The invention discloses an intelligent deposited ash sampling device and method for the online measurement of effective heat conductivity of deposited ash, and belongs to the technical field of deposited ash collection and heat conductivity measurement of a power plant boiler tail flue. The device comprises a supporting body outer sleeve, a sampling probe connected with one end of the supporting body outer sleeve, a temperature measuring unit and an intelligent accumulated ash purging unit; the thickness of an ash deposition layer on the surface of the probe can be monitored on line in real time through an ultrasonic thickness gauge; the temperatures of the outer wall and the inner wall of the sampling probe can be measured in real time through a first thermocouple and a second thermocouple, and the real-time temperature of the ash deposition layer on the surface of the probe can be iteratively solved through an iterative method, so that the effective thermal conductivity of the ash deposition layer on the surface of the probe can be accurately measured on line in real time. By the adoption of the technical scheme, the real-time online monitoring can be conducted on the effective heat conductivity of the ash deposition layer while sampling is conducted, so that intelligent sweeping control over the ash deposition layer is facilitated, and the meaningful reference and guidance are brought to the ash removal of an actual boiler.

Description

technical field [0001] The invention belongs to the technical field of ash collection and thermal conductivity measurement of a tail flue of a power plant boiler, and more specifically relates to an intelligent ash sampling device and method for online measurement of the effective thermal conductivity of deposited ash. Background technique [0002] my country's coal resources are widely distributed, with large proven reserves and low mining costs, so they are widely used as the main fuel in power production. When the boiler burns coal, the heating surface of each part of the boiler is accompanied by mineral deposits to varying degrees, and a considerable part of the steam coal is not high in quality, contains high ash or high alkali metal content, and is prone to Serious dust accumulation problem occurs on the heating surface. The occurrence of these problems will lead to deterioration of the heat transfer conditions of the heat exchange tubes, corrosion of the tube walls, ...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the shortcomings of using the existing ash sampling device which has a single function and cannot realize the real-time on-line monitoring of the thermal conductivity of the ash and the research on intelligent cleaning control, and provides an online method for measuring the effective thermal conductivity of the deposited ash Intelligent dust sampling device and method

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