H2S corrosivity and adsorption-desorption characteristic synchronous monitoring system

Abstract

According to the H2S corrosivity and adsorption-desorption characteristic synchronous monitoring system provided by the invention, H2S gases with different concentrations are proportioned through a mass flow meter and are introduced into an anti-corrosion gas chamber and an anti-adsorption gas chamber, different porous metal materials can be put into the anti-corrosion gas chamber, and different adsorption materials are put into a quartz spiral tube of the anti-adsorption gas chamber; the gas chambers are communicated with a TDLAS-based high-precision H2S on-line measurement system to monitor the concentration change of H2S in the gas chambers in real time, and by changing the temperature, humidity, pressure and other conditions of the two gas chambers, the research on the H2S corrosion mechanism and adsorption-desorption characteristics can be synchronously realized, the combination of static monitoring and dynamic monitoring is realized, a compensation model is established, and the measurement accuracy is improved. And a foundation is laid for high-fidelity pretreatment and on-line monitoring of the H2S gas near the wall surface of the water cooling wall of the pulverized coal fired boiler.

Description

technical field [0001] The invention relates to the technical field of gas monitoring, in particular to a H 2 S synchronous monitoring system for corrosion and adsorption analysis characteristics. Background technique [0002] In recent years, my country's coal-fired power plants have comprehensively implemented ultra-low emission and energy-saving transformation. Coal-fired units have adopted "low-nitrogen combustion" and "anoxic combustion" to suppress the formation of nitrogen oxides, so as to achieve ultra-low emission standards. Better implement the "ultra-low emission" policy, launch a series of subsidy policies such as "near zero emission" to give back to power plants, and reduce the economic burden of power plants in the short term, but with the steady advancement of the "ultra-low emission" policy, such as "Intractable diseases" such as air preheater blockage and air preheater blockage began to affect the operation of the unit, but the sulfur in the pulverized coal o...

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Problems solved by technology

[0005] 1. Pulverized coal boiler furnace water wall near the wall surface H 2 The S online monitoring system adopts the extractive sampling method, because the H 2 S has strong corrosive and adsorption characteristics, and is soluble in water. It puts forward higher requirements for the traditional extraction sampling pretreatment monitoring system. At present, the cold-dry method of the monitoring system mostly uses high-temperature heat-tracing polytetrafluoroethylene tubes combined with condensing devices for sampling pretreatment. High-fidelity sample gas cannot be guaranteed;

[0006] 2. The sampling pretreatment system does not have H 2 S gas establishes an empirical model of temperature, humidity, etc., surface corrosion rate and corrosion depth, and analyzes the adsorption capacity of different materials and materials at different temperatures and humidity. It is impossible to determine the optimal material and the best set temperature, and H has not been established. 2 S adsorption analytical compensation model to accurately and quantitatively analyze loss

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