Dirt monitoring device

Abstract

This invention provides one dirty monitoring device in engineer heat physical and energy utilization field, which comprises temperature sensor, pressure sensor and concentration sensor, data collector and display meter, wherein, the temperature sensor is to detect inside wall temperature of tube with 8 to 12 spots measured; the pressure sensor is to measure the pressure loss of the tube section; the concentration sensor is to measure dirty suspension or salt main concentration. The data through A / D conversion are combined with relative data for computing and correcting.

Description

technical field [0001] The patent of the invention belongs to the field of engineering thermophysics and energy utilization, and provides a dirt monitoring device, which is widely used in the thermal equipment industry of fluid transportation and energy transfer. Background technique [0002] Most of the current monitoring models of fouling are formed based on heat exchange theory, and the result of the ratio of temperature difference to heat flow—fouling thermal resistance—is the ultimate goal of monitoring, so as to measure the impact on the heat transfer effect and make decisions. But it also brings some problems. First of all, for the non-heat exchange situation, because the temperature difference is zero, it is obviously impossible to use the dirt thermal resistance to measure the dirt deposition. This situation also exists in many industries, such as power, chemical industry The pipeline transportation of pure multi-phase flow and the isothermal flow of multi-component...

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Problems solved by technology

But it also brings some problems. First of all, for the non-heat exchange situation, because the temperature difference is zero, it is obviously impossible to use the dirt thermal resistance to measure the dirt deposition. This situation also exists in many industries, such as power, chemical industry The pipeline transportation of pure multi-phase flow and the isothermal flow of multi-component flow along the wall surface in air-conditioning projects, etc. The existence of these dirt will sometimes corrode the wall surface, block the pipeline, increase resistance, and reduce the economical efficiency of equipment operation, so we must pay attention to it; secondly , when the temperature difference is used to describe the thermal resistance of the dirt, the specific phenomenon that the thermal resistance of the dirt may be a negative value is found. When the surface roughness with dirt accumulation is very large, the boundary layer is destroyed, the local convective heat transfer coefficient increases and the thermal resistance of the dirt decreases, so a negative value appears

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