Sampling and collecting system of SO3 in wet method desulphurization system tail flue gas

Abstract

The invention discloses a sampling and collecting system of SO3 in wet method desulphurization system tail flue gas. The system includes a probe for acquiring wet flue gas, a heating device connected with the probe and used for heating the wet flue gas, a dedusting device connected with the heating device and used for removing solid particles comprising dusts and the like in the flue gas, a condensing device connected with the dedusting device and used for condensing sulfuric acid steam in the flue gas, an examining device connected with the condensing device and used for examining whether the sulfuric acid steam collected in the condensing device reaches saturation and collecting the sulfuric acid steam in the flue gas when the saturation is realized, a drier connected with the examining device and used for removing water in the flue gas, an adjusting valve connected with the drier and used for adjusting the flow velocity of the flue gas to ensure that sampling is constant speed sampling, a vacuum pump connected with an outlet of the adjusting valve and used for pumping the flue gas, and a wet gas meter connected with an outlet of the vacuum pump and used for determining the flow, temperature and pressure of the flue gas and discharging the flue gas.

Description

technical field [0001] The invention relates to the field of pollutant measurement and treatment in coal-fired power plants, in particular to a method for SO in tail flue gas of wet desulfurization system 3 sample collection system. Background technique [0002] As of the end of 2010, the installed capacity of desulfurization devices in my country's coal-fired power plants exceeded 600 million KW, of which wet desulfurization devices accounted for about 90%. The SO 3 The removal efficiency is generally between 30% and 50%, and the unremoved SO 3 After the wet system, almost all with H 2 SO 4 Existing in the form of sulfuric acid aerosol, it will seriously pollute the environment and human health through chimney emission in the state of sulfuric acid aerosol. Therefore, effective measures must be taken to control SO 3 emissions. [0003] Thanks to SO 3 It is easy to combine with water vapor in the flue gas to form sulfuric acid vapor, which condenses on the heating surf...

AI Technical Summary

Problems solved by technology

At present, no flue gas analyzer has been found to measure SO 3 content of this function, which is mainly due to SO 3 It will condense or adhere to the transmission pipeline in the form of sulfuric acid vapor or sulfuric acid mist during transmission to the measurement terminal of the instrument, resulting in sampling errors and strong corrosion to the instrument, so it is difficult to collect and measure

Although for SO 3 Some researchers have proposed their own measurement measures, but the measurement errors are very large, and it has not been found that it can accurately measure SO 3 content measure

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