Scale amount measurement system and method for superheater tube sample of thermal power plant

Abstract

The invention relates to a scale amount measurement system and method for a superheater tube sample of a thermal power plant. The system comprises an electrolytic stripping descaling device, an ultrasonic cleaner for conducting degreasing treatment on the superheater tube sample before and after descaling and an electronic scale for weighing the mass of the superheater tube sample before and after descaling. The electrolytic stripping descaling device comprises a direct-current electrolyzer and an electrolytic cell for containing an electrolytic stripper. The direct-current electrolyzer comprises a positive pole and a negative pole. The positive pole and the negative pole are correspondingly connected with a platinum electrode and the superheater tube sample. The platinum electrode and the superheater tube sample are arranged in the electrolytic cell. The direct-current electrolysis is conducted under the effect of the electrolytic stripper, and scale on the superheater tube sample is stripped off. The sale amount measurement system and method have the technical effects that the descaling speed is high, the consumed time is short, and the blank wastage amount of base metal is low; and the damage to the tube sample base metal is small, blank correction is usually not required, the original appearance of the base body of the tube sample under the scale can be retained, and observation of the metal corrosion form of the superheater tube sample under the scale is quite facilitated

Description

technical field [0001] The invention belongs to the technical field of measuring scale amount of a superheater tube sample in a thermal power plant, and in particular relates to a system and method for measuring the scale amount of a superheater tube sample in a thermal power plant. Background technique [0002] The determination of the chemical cleaning interval of the thermal power plant boiler and the evaluation of the boiler water treatment and water chemical operation mode are based on the amount of sediment on the inner surface of the boiler tube (g / m 2 ) or fouling rate (g / (m 2 · a)) is the judgment standard, and the scale amount measured by the chemical determination method stipulated by the industry standard currently adopted is only the average value of the scale amount on the fire side and the back fire side of the furnace tube, and the measurement result is usually low. In addition, because the higher the boiler pressure, the harder the scale and the stronger th...

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Problems solved by technology

[0002] The determination of the chemical cleaning interval of the thermal power plant boiler and the evaluation of the boiler water treatment and water chemical operation mode are based on the amount of sediment on the inner surface of the boiler tube (g / m 2 ) or fouling rate (g / (m 2 · a)) is the judgment standard, and the scale amount measured by the chemical determination method stipulated by the industry standard currently adopted is only the average value of the scale amount on the fire side and the back fire side of the furnace tube, and the measurement result is usually low

In addition, because the higher the boiler pressure, the harder the scale and the stronger the adhesion to the inner wall of the tube, it is difficult to completely remove the scale of the superheater tube even if the cleaning time is prolonged by the usual chemical determination method, or due to excessive cleaning time Long and increase the corrosion loss of the base metal, even if the blank correction method is used, it will still cause a large measurement error

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