Method for measuring sulfate ions in scaled component of water vapor system in power station

Abstract

The invention discloses a method for measuring sulfate ions in a scaled component of a water vapor system in a power station, which overcomes the problems that the error of sulfate ion content is big because of the high content of iron ions, the linearity of test working curve is unsatisfactory, the data repeatability is poor, and the linear correlation coefficient r is difficult to reach 0.999. Besides, the invention perfects the test method to ensure that test data is accurate and reliable. The method comprises the following steps: taking a sulfate working solution; diluting the sulfate working solution; adding a condition agent into the solution, and then adding a barium chloride to enable the solution mixture to react and generate barium sulfate sediment; measuring the absorbance A, wherein blank absorbance A0 with the content of sulfate being 0 is deducted from the absorbance A to acquire absorbance (A-A0); drawing a curve according to the smooth curve relationship between the absorbance (A-A0) and the sulfate ion content m (within the range of 0-1.5mg); within the range, establishing a linear regression equation; taking a scaled sample to be measured, and preparing into a solution to be measured; measuring the A0 and A; substituting the A0 and A into the linear regression equation or checking the working curve, thereby acquiring the sulfate ion content; and finally, calculating the sulfuric anhydride content in the scaled sample to be measured.

Description

technical field [0001] The invention relates to a method for determining sulfate ion in scaling components of a water vapor system in a power plant. Background technique [0002] Sulfate is a harmful ion in the water vapor system of thermal power plants. Most of the various water qualities in the water vapor system of power plants, such as make-up water, condensate water, and steam, etc., contain sulfate radicals. During the operation of the unit, if the water vapor quality is not properly controlled, sulfate will be carried by the steam and deposited on the turbine blades. During the overhaul of some units, it was found that scaling components such as steam drums, steam turbine blades, and water wall tubes contained sulfate. Therefore, it is necessary to correctly analyze the sulfate content in scale samples and corrosion products. By analyzing the data, find out the cause of salt accumulation and scale, so as to take measures to improve thermal efficiency and save energy....

AI Technical Summary

Problems solved by technology

The present invention is by changing precipitation agent barium chloride (BaCl 2 2H 2 O) form and dose, select new measurement wavelength and cuvette length, overcome the difficult problem of poor linearity of test work curve, poor data reproducibility, linear correlation coefficient r is difficult to reach 0.999, improve the test method so that the test data accurate and reliable

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