System and method for testing reaction kinetics parameters of ultra-low concentration gases in inert channel

Abstract

The invention relates to a system and a method for testing reaction kinetics parameters of ultra-low concentration gases in an inert channel, and belongs to the technical field of gas utilization. Thesystem comprises a gas source and flow regulating system I, a uniform blending system II, a preheating and reaction system III, and an analyzing and testing system IV which are sequentially connected. The gas source and flow regulating system comprises an air compressor, a dehydration drying device, a pressure reducing valve, a needle shaped regulating valve, a methane gas cylinder, a high-pressure pressure reducing valve, a low-pressure pressure reducing valve, and a flowmeter. The uniform blending system comprises a gas mixing section, an air release valve, a flowmeter, and a methane concentration sensor. The preheating and reaction system comprises a heater, a reactor, a telescoping thermocouple, a pressure gauge, and a thermocouple. The analyzing and testing system comprises a water cooling section, a water pump, a water tank, an air release valve, an infrared spectrometer, a gas chromatograph, a pressure gauge, a thermocouple, and a methane concentration sensor. According to thesystem and the method for testing the reaction kinetics parameters of the ultra-low concentration gases in the inert channel, the mathematical model of the heat storage oxidation device used for guiding the industrial amplification design can be obtained.

Description

technical field [0001] The invention belongs to the technical field of gas utilization, and relates to an ultra-low concentration gas reaction kinetic parameter test system and method in an inert channel. Background technique [0002] Methane is second only to carbon dioxide as a greenhouse gas, and its greenhouse effect is 20 times that of the same concentration of carbon dioxide. Emission of a large amount of methane into the atmosphere is also a waste of energy resources. However, the concentration of exhaust gas is low (usually less than 1%) and unstable, so it cannot be burned in conventional ways. The use of this low-grade energy has become a challenge for the whole world. [0003] At present, systems commonly used in exhaust gas, such as gas thermal storage and oxidation devices, provide a heat storage layer with an operating temperature exceeding 800°C (beyond the ignition temperature of methane). Because the self-heat balance of methane reaction in regenerative ox...

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Problems solved by technology

However, there are large differences in the reaction products and kinetic parameters in the existing research results. Because the reaction mechanism is directly related to the accuracy of the mathematical model of the thermal storage oxidation device and the accuracy of the numerical simulation results to guide the industrial design, it is necessary to carry out Experimental research has obtained the oxidation reaction mechanism of methane with a volume concentration of about 1% in the inert heat storage channel, and conducted simplified research to obtain a mathematical model of the heat storage oxidation device that can be used to guide industrial scale-up design, which has important application value

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