Device and method for detecting sulfur trioxide or sulfuric acid mist in flue gas

Abstract

The invention discloses a device and a method for detecting sulfur trioxide / sulfuric acid mist in flue gas. The device comprises a detection unit, a flue gas extraction unit and a reaction sampling unit, wherein the detection unit is used for detecting the concentration of carbon monoxide in gas; the flue gas extraction unit comprises a gas extraction pipe, one end of the gas extraction pipe is used for introducing flue gas to be detected, and the other end is connected with the detection unit to detect the concentration of carbon monoxide in the flue gas; the reaction sampling unit comprises a reaction tube filled with calcium oxalate and a heating assembly for heating the reaction tube, one end of the reaction tube is used for introducing flue gas to be detected, and the other end of the reaction tube is connected with the detection unit to detect the concentration of carbon monoxide in the reacted gas. By respectively detecting the carbon monoxide concentration in the flue gas to be detected and the carbon monoxide concentration in the reacted gas, the detection can be completed in a short time, and the detection result can be obtained. The device has the advantages of simple structure, simple and convenient operation process and accurate detection result.

Description

technical field [0001] The invention relates to the technical field of flue gas pollutant detection, in particular to a detection device and method for sulfur trioxide / sulfuric acid mist in flue gas. Background technique [0002] In the process of fuel combustion, the sulfur contained in it will be partially converted into sulfur trioxide, which will further react with water to generate sulfuric acid, which will form sulfuric acid mist when it is discharged with the flue gas. hazardous pollutants. In addition, the flue gas denitration technology will cause sulfur trioxide to react with ammonia gas to form ammonium sulfate, which will cause problems such as blocking the air preheater and endanger the safe operation of the equipment. Therefore, there are requirements for the detection and monitoring of sulfur trioxide or sulfuric acid. The chemical properties of sulfur trioxide and sulfuric acid are relatively active. 2 In comparison, its content in flue gas is relatively l...

AI Technical Summary

Problems solved by technology

[0007] 1) Although there are temperature requirements for the heating quartz sampling tube in the prior art, due to the high flow velocity at the flue gas inlet, a very large temperature gradient is formed, and there is dust deposition, so it cannot be guaranteed that sulfur trioxide, sulfuric acid, etc. can pass through The sampling tube reaches the effective adsorption structure

[0008] 2) The structure of the prior art system is complicated, there are many interfaces, and the leak detection is complicated, etc., which is prone to air leakage, which brings large errors to the test results

[0009] 3) In the later stage of the prior art, after rinsing multiple parts, the solution needs to be analyzed in the laboratory, and the test results cannot be seen immediately

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