Online monitoring method for scaling thickness on surface of electric heating element of electric boiler

Abstract

The invention relates to an online monitoring method for the scaling thickness on the surface of an electric heating element of an electric boiler, which is characterized by comprising the steps of data acquisition of the electric boiler, calculation for the non-scaling surface temperature of the heating element of the electric boiler, calculation for the average scaling thickness of the electricheating element of the electric boiler, determination for the scaling thickness of different parts of the electric heating element of the electric boiler and the like. The heat flux density on the surface of the electric heating element immersed in the water during the operation of the electric boiler is determined according to the measured water level of the electric boiler and the actual heat exchange capacity of a working medium together, thus the temperature of the non-scaling surface of the electric heating element of the electric boiler is calculated according to a dimensionless correlation formula, which is organized by Rohsenow, of saturated nucleate boiling, then the average scaling thickness of the heating element of the electric boiler is obtained, and the scaling thickness of different parts of the electric heating element of the electric boiler is obtained according to a correction coefficient for the scaling thickness of different parts of the electric heating element, thereby achieving online accurate monitoring for the scaling thickness on the surface of the electric heating element of the electric boiler, and solving a problem that accurate online monitoring cannotbe performed on the scaling thickness of the electric heating element of the electric boiler.

Description

technical field [0001] The invention relates to the field of thermal equipment performance state monitoring and diagnosis, and relates to an online monitoring method for scaling thickness on the surface of an electric heating element of an electric boiler. Background technique [0002] An electric boiler is also called an electric heating boiler. It uses electricity as energy and converts it into heat energy, and then converts it through the boiler to output steam, high-temperature water or organic heat carrier with a certain amount of heat energy. [0003] The electric heating tube of the electric boiler is prone to fouling, which is a fatal flaw of the electric boiler. The impurities in the furnace water will be adsorbed on the electric heating element (electric heating tube and electric heating rod), and the oxygen in the water will also oxidize the electric heating element. Once the electric heating element in the electric boiler is scaled or oxidized, it will seriously ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the current problems and defects that the scaling thickness of the electric heating element of the electric boiler cannot be monitored online in real time. Boiling heat transfer, by monitoring the temperature of the working fluid at the inlet and outlet of the electric boiler, the flow rate of the working fluid, the water level of the electric boiler, and the temperature measurement points on the surface of the electric heating element of the electric boiler, combined with the principle of heat balance, a method that can automatically calculate and accurately monitor the electric boiler is proposed. On-line Diagnosis Method of Scale Thickness on the Surface of Electric Heating Element

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