Method and device for detecting SO3 content in flue gas

Abstract

The invention relates to the inspection method and sampling device for the SO3 content of the smoke released by thermal power plant boiler. The sampling device comprises the dust remover, sampling tube, spiral collecting tube and drawing device, with the dust remover at the input end of the sampling tube whose output connected with the input of the spiral collection tube, with the input and output ends of the spiral collection tube on the spiral, and the output connected with the drawing device through hoses. It collects SO3 of the smoke to the spiral collection tube, getting SO42 sample solution after treatment, with arsenazo III as the color developing agent, dropping with barium acetate solution to get the density of SO3. It is accurate, quick, and reliable, with every possible means to avoid heat waste due to improving acid dew point corrosion.

Description

technical field [0001] The invention relates to a detection method of boiler flue gas components in a thermal power plant, in particular to SO in the flue gas of a thermal power plant boiler. 3 Content detection method and device thereof. Background technique [0002] Sulfur-containing fuels in thermal power plants are combusted to generate SO 2 and SO 3 . In 2005, the total amount of sulfur dioxide emissions in the country was 25.49 million tons, exceeding 80% of the capacity of the atmospheric environment. The total amount of sulfur dioxide emissions reached the first place in the world, and about half of them came from thermal power plants, causing acid rain to cover one-third of the country's land area. one. Sulfur dioxide emission is the main reason for the increasing air pollution and acid rain in my country. At present, the most effective way to solve sulfur dioxide pollution is flue gas desulfurization. Limestone-gypsum wet desulfurization technology is the most...

AI Technical Summary

Problems solved by technology

Compared with the gravimetric method, this method is relatively simple to operate, but there are also deficiencies, such as: Ba 2+ The amount of excess has a great influence on the result, when Ba 2+ When the excess is too much, EDTA will 2+ Before complete complexation, chrome black T will change color prematurely, and then excess Ba 2+ Combining with chrome black T again makes the end point very inconspicuous and causes analysis errors

Especially when the sulfate content in the sample fluctuates greatly, Ba 2+ The amount of excess is difficult to grasp in actual operation, which will lead to large errors in the results

BaCl 2 -MgCl 2 The mixed solution is not stable enough, and after a period of time, Mg(OH) is often formed due to the insufficient acidity of the solution. 2 flocculent precipitation, but if the acidity of the mixture is increased, the BaSO 4 Increased solubility leads to lower assay results

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