NH3 concentration online sampling measurement equipment of SCR reactor and method

Abstract

The invention discloses NH3 concentration online sampling measurement equipment. The equipment comprises a coupling catalytic reaction device, a SCR inlet flue sampling module and a SCR outlet flue sampling module; the SCR inlet flue sampling module communicates with the coupling catalytic reaction module; the SCR outlet flue sampling module communicates with the coupling catalytic reaction module; the coupling catalytic reaction module is used for mixing sample gas extracted by the SCR inlet flue sampling module and the sample gas extracted through the SCR outlet flue sampling module, and themixed sample gas is imported into a NOx analyzer through two channels; a selective reduction catalyst is configured in the first channel, and the second channel is a straight channel. The equipment disclosed by the invention can precisely measure the NH3 concentration at the SCR reactor outlet, so that a user can comprehensively understand the internal condition of the SCR reactor. The inventionfurther discloses a NH3 concentration online sampling measurement method of the SCR reactor, and the NH3 concentration at the outlet of the SCR reactor can be measured.

Description

technical field [0001] The invention relates to the technical field of flue gas detection, and more specifically, relates to an online sampling and measuring device for NH3 concentration of an SCR reactor, and also relates to an online sampling and measuring method for NH3 concentration of an SCR reactor. Background technique [0002] With the development of society, people pay more and more attention to environmental protection. Coal-fired power plants have x Emission concentration requirements are getting higher and higher. At present, denitrification devices in coal-fired power plants mainly use SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) reactors. conditions and other factors, the flow field in the flue and the NO x The concentration field is unevenly distributed, causing the ammonia / nitrogen molar ratio in some areas to be too large, ammonia cannot fully participate in the reaction, and the escape of ammonia at the outlet of the SCR reactor exce...

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Problems solved by technology

At present, denitrification devices in coal-fired power plants mainly use SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) reactors. conditions and other factors, the flow field in the flue and the NO x The concentration field is unevenly distributed, causing the ammonia / nitrogen molar ratio in some areas to be too large, ammonia cannot fully participate in the reaction, and the escape of ammonia at the outlet of the SCR reactor exceeds the limit. At the same time, there is a lack of effective continuous online monitoring means, and it is impossible to fully understand the interior of the SCR reactor However, it cannot provide a reliable basis for fine control of ammonia injection, resulting in a low level of operation and management of the SCR reactor, serious blockage of the air preheater, increased energy consumption of the induced draft fan and ammonia consumption, serious dust collection on the electrode plate of the electrostatic precipitator, and reduced dust removal Efficiency, serious operation unit safe and reliable economical operation

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