SNCR (Selective Non-Catalytic Reduction) denitrification technology test bench

Abstract

The invention provides an SNCR (Selective Non-Catalytic Reduction) denitrification technology test bench. The SNCR denitrification technology test bench comprises a gas distribution and intake system,a plunger flow reactor system and a sampling and testing system, wherein the plunger flow reactor system comprises a furnace tube with an electric heater arranged outside; a fan for air extraction isconnected to the bottom of the furnace tube; the gas distribution and intake system comprises a gas distribution cylinder consisting of two groups of gas cylinders; the first group comprises a nitrogen cylinder, an oxygen cylinder, a carbon dioxide cylinder and a nitric oxide cylinder; the gas outlet of each gas cylinder is connected with a pressure relief valve and a mass flowmeter in sequence,and then connected in parallel with a metering steam generator to the inlet of a mixed gas preheater; the outlet of the mixed gas preheater is connected with the furnace tube through a mixed samplinggun; the second group comprises a nitrogen cylinder and an ammonia cylinder of which the gas outlets are connected with the pressure relief valve and the mass flowmeter in sequence respectively, and then connected with the furnace tube through an ammonia gas sampling gun; and the sampling test system is connected with the furnace tube, and used for measuring the concentration of ammonia in flue gas after denitrification. By simulation of the flue gas with gas distribution, the flue gas composition can be stabilized, and the test conditions are highly repeatable.

Description

technical field [0001] The invention belongs to the field of flue gas pollutant purification, and relates to a SNCR denitrification technology test bench. Background technique [0002] Nitrogen oxides (NOx) are produced during the combustion of fossil fuels such as coal, oil, and natural gas. Such substances are discharged into the atmosphere and are one of the main causes of acid rain. There are three main ways to generate NOx in the combustion process: (1) thermal type, the air blown into the fuel combustion contains nitrogen, which is oxidized at high temperature to produce nitrogen oxides; (2) rapid type, produced by the fuel combustion process CH atom hits N 2 Molecules, to generate CN compounds, and then further oxidized to generate nitrogen oxides; (3) fuel type, nitrogen-containing organic compounds in the fuel are volatilized, released, oxidized and decomposed into nitrogen oxides during the combustion process. [0003] In order to remove NOx generated during the ...

AI Technical Summary

Problems solved by technology

The generation method of flue gas in this type of test bench is the same as the actual production, but because the fuel properties are not easy to maintain constant, it will affect the repeatability of the test

At the same time, when the existing test bench is performing the SNCR denitrification test, the measurement accuracy of the concentration of ammonia in the flue gas after denitrification is not high, which affects the accuracy of the test

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