Testing device and testing method of sulfur-resisting and water-resisting performance of low-temperature flue gas denitrification catalyst for cement kiln

Abstract

The invention relates to a testing device and testing method of sulfur-resisting and water-resisting performance of a low-temperature flue gas denitrification catalyst for a cement kiln. The testing device comprises a gas distribution system, a catalyst reaction system and a flue gas analysis and tail gas treatment system; a nitrogen gas inlet unit, an oxygen gas inlet unit, a nitric oxide gas inlet unit and a sulfur dioxide gas inlet unit are connected with a gas mixing device respectively; the gas mixing device is connected with a catalyst reactor; the nitrogen gas inlet unit is connected with the catalyst reactor; the nitrogen gas inlet unit is also connected with a water steam generation device; the water steam generation device is connected with the catalyst reactor; the catalyst reaction system comprises the catalyst reactor, a temperature control device and a tubular heating furnace. The testing device can be used for effectively preventing errors caused by catalytic performanceof a stainless steel pipe on a test and the accuracy of a testing result is improved.

Description

technical field [0001] The invention relates to a test device and a test method for the sulfur and water poisoning resistance of a catalyst, in particular to a test device and a test method for the sulfur and water resistance of a low-temperature flue gas denitrification catalyst used in a cement kiln. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere, with NO and NO 2 The largest proportion. Nitrogen oxides can cause great harm to the human body and the environment. The Selective Catalytic Reduction (SCR) process is currently the main technology to control the emission of nitrogen oxides from stationary sources. At present, the most widely used in industry is V with medium temperature (300°C-400°C) activity 2 o 5 -WO 3 / TiO 2 Catalyst, in order to take advantage of flue gas temperature, V 2 o 5 -WO 3 / TiO 2 Catalysts are usually arranged before the dust removal and desulfurization devices, while the low-temperatu...

AI Technical Summary

Problems solved by technology

However, there will be a certain concentration of dust and low concentration of SO in the flue gas 2 , will still poison and deactivate the catalyst, making it difficult to realize industrial application

At present, most of the test devices for denitrification catalysts are activity test devices. Chinese invention patent CN105628858A discloses a catalyst test system, but this system evaluates the denitrification efficiency of denitrification catalysts used in power plants by simultaneously feeding all reaction gases into the catalyst reaction system. , ammonia slip rate and SO 2 / SO 3 conversion, no control for SO 2 The on-off of gas and water vapor in the catalytic reaction process is used to evaluate the anti-sulfur and water poisoning performance of the tested catalyst

At the same time, the characteristics of flue gas from power plants are different. The characteristics of flue gas from cement kilns are large flue gas volume, high dust concentration, fine and sticky dust particles, and the main components of dust are CaO and SiO. 2 and Al 2 o 3 Currently, there is no device and method for testing the anti-poisoning performance of low-temperature denitrification catalysts used in cement kilns by simulating the characteristics of actual cement kiln flue gas.

Images