Method for preparing medium-low temperature SCR denitration catalyst and catalyst prepared by same

Abstract

The invention discloses a method for preparing a medium-low temperature SCR denitration catalyst and the catalyst prepared by the method. The preparation method comprises the following steps: impregnating a catalyst base material into an introduced component impregnation liquid having a series concentration, heating the impregnated sample to detect the content of a target component, and drawing a relation curve of the concentration of the impregnation liquid and the content of the corresponding component; calculating the concentration of the impregnation liquid at the required content of the target component according to the relation curve; then, treating the base material by an impregnation method the same as that in the impregnation curve drawing stage; and finally, heating the catalyst to obtain a finished product. The method can be used for solving the conflict problem between the introduced component and the catalyst formula, treating a catalyst module, modifying an inactivated traditional catalyst into a medium-low temperature catalyst in a regenerating process, and is easy to operate and simple in equipment. The prepared catalyst has a good denitration activity at 250-420 DEG C, and has a SO2 oxidation rate less than 1 percent at high temperature. The method and the catalyst have a relatively high industrial application level.

Description

Technical field [0001] The invention relates to the technical field of denitration catalysts, in particular to a method for preparing a medium-low temperature (generally considered to be lower than 300°C as low temperature and 300-420°C as medium temperature) SCR denitration catalyst and the prepared catalyst. Background technique [0002] In the context of the country's vigorous development of clean coal-burning technology and the promotion of ultra-low emissions, the country has strengthened its control of pollutant emissions from coal-fired units. It has become an inevitable requirement for coal-fired power plants to achieve full-load denitrification, and a new SCR denitrification catalyst suitable for variable load conditions in coal-fired power plants has become one of the main methods to solve the problem. Affected by the new economic normal, the power consumption of domestic industrial enterprises has dropped significantly, and the utilization hours of thermal power genera...

AI Technical Summary

Problems solved by technology

Domestic universities and scientific research institutes have achieved important results in the research of medium and low temperature SCR denitrification catalysts. However, the traditional catalyst formula is relatively mature, and the introduction of new components may react with the materials in the original formula, resulting in difficulty in mud mixing. It has a great impact on the plasticity and water content of the mud, and affects the apparent activity of the catalyst. In severe cases, it will lead to sandy mud and cannot be extruded.

In order to solve the above problems, a large number of raw material screening, formula adjustment and process adjustment experiments can be carried out, but the research process will consume a lot of manpower and material resources, which seriously limits the industrialization of scientific and technological achievements, and the final production process may be different from the existing process. There is a large deviation, and the ideal research results may not be obtained

[0004] The impregnation method is an effective method to solve the above problems. However, the traditional impregnation process generally can only obtain the catalyst with a certain fixed content of the loaded component, but in the actual flue gas application, the amount of the loaded component needs to be adjusted; the catalyst impregnated generally introduced The process can only be used for the treatment of catalyst monomers. The strength of the treated monomers is obviously reduced due to the increase of water content, etc. Improper handling will easily lead to a decline in product qualification rate and low production efficiency.

[0005] It should be noted that the invention patent of CN102658155A authorized by Han Kuihua of Shandong University and others has obtained a supported denitration catalyst with a wide denitration temperature window, but it is not a monolithic catalyst, and the catalyst preparation process is complicated and the cycle time longer

In CN102000562A invention patent published by Feng Ziping, Guangzhou Institute of Energy Research, Chinese Academy of Sciences, titanium oxysulfate (TiOSO 4 ) as additives to improve the dispersion of vanadium and tungsten, and in monolithic catalyst loading, TiOSO 4 The existence of the catalyst will cause a large loss of the specific surface area of ​​the catalyst, and it is difficult for the catalyst to obtain the ideal modification effect

The invention patent of "A Soaked Low-temperature Honeycomb Flue Gas Catalyst and Its Preparation Method" applied by Zhu Yudong et al. 2 o 5 、WO 3 The oxide is directly impregnated on the surface of the catalyst, and the active components and additives are difficult to disperse at the molecular level. The key is that the published catalyst temperature range (100°C-190°C) is limited

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