Low-temperature flue gas denitration catalyst forming process

Abstract

The invention relates to a low-temperature flue gas denitration catalyst forming process. The low-temperature flue gas denitration catalyst forming process comprises the following steps of adding ammonium metavanadate powder and kapok in deionized water, stirring to form white suspension liquid, then adding monoethanolamine, and heating until the ammonium metavanadate powder is wholly dissolved to form a solution 1; dropwise adding a lactic acid solution in a mixed liquid of silica sol and alumina sol to form a solution 2; adding titanium dioxide, sesbania powder, PEO, CMC, stearic acid and fiber, stirring and uniformly mixing to obtain milk white mixed powder; adding the solution 1, the solution 2 and the deionized water in the mixed powder, and stirring to obtain a wet material mass; and carrying out extrusion moulding on the wet material mass by an extruder, and drying and calcining to obtain the catalyst. With the adoption of the low-temperature flue gas denitration catalyst forming process, as active ingredients of a traditional vanadium-tungsten-titanium catalyst system are hardly modified, and the production process is changed to certain extent, the activity is obviously improved, strip and honeycomb type catalysts are extruded by slightly regulating a formula, and the low-temperature flue gas denitration catalyst forming process can be widely applied to industrial furnaces used for waste incineration and the like with low temperature and complex flue gas conditions and flue gas denitration of a coal-fired power plant in low-temperature arrangement.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide control in environmental protection, in particular to a catalyst forming process for low-temperature flue gas denitrification. Background technique [0002] For NO emissions from stationary sources such as power plants and industrial boilers X , to NH 3 Selective Catalytic Reduction (SCR) as a reducing agent is currently the most researched, most widely used, and most effective flue gas NO X removal technique. The most mature catalyst currently used is V 2 o 5 / TiO 2 or at V 2 o 5 / TiO 2 The main advantages of catalysts modified on the basis of the above are high activity and high sulfur resistance, but such catalysts only have high activity when the operating temperature is higher than 350 °C. For a large number of industrial furnaces and kilns, due to the low exhaust gas temperature (<250°C), such as waste power plants, low-temperature and low-dust methods are mostly feasible ...

AI Technical Summary

Problems solved by technology

For a large number of industrial furnaces and kilns, due to the low exhaust gas temperature (<250°C), such as waste power plants, low-temperature and low-dust methods are mostly feasible in engineering, but the SCR denitrification device in this arrangement requires the use of Heat source, such as using natural gas to reheat the flue gas, consumes a lot of extra energy and is very expensive to operate