Preparation method of continuous extrusion SCR (Selective Catalytic Reduction) denitration honeycomb catalyst

Abstract

The invention discloses a preparation method of a continuous extrusion SCR (Selective Catalytic Reduction) denitration honeycomb catalyst, and belongs to the field of the catalyst. The method comprises the following steps that raw materials are mixed and then fully and uniformly stirred to obtain a mixed solution; the mixed liquid is piled up in a stale manner after being mixed; then filtered by a pre-extruder and piled up in the stale manner to obtain muds; a wet blank extruded continuously by a mud vacuum extrusion forming machine is cut to obtain the wet blank with an irregular end shape; the wet blank with the irregular end shape is dried and then cut to respectively obtain end wastes and a fixed length dry blank of a regular end surface; the fixed length dry blank of the regular end surface is calcined after being dried to obtain the catalyst; and the end wastes are mixed and recycled after being crushed, pulped and classified. The method generates almost no waste, lowers resource consumption, and reduces impacts on the environment relative to the existing technological process. Furthermore, the method generates almost no waste, lowers resource consumption, and reduces impacts on the environment relative to the existing technological process.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a preparation method of a continuous extrusion SCR denitration honeycomb catalyst. Background technique [0002] China is a country where coal is the main energy source. Coal accounts for 75% of the primary energy, and more than 84% of it is used through combustion. Nitrogen oxides (NOx) released by coal combustion are one of the main sources of air pollution. . Selective Catalytic Reduction (Selective Catalytic Reduction, SCR) is the most common and most effective method for removing nitrogen oxides in boiler exhaust gas, and is widely used in various industrial devices. The main principle is to use ammonia as a reducing agent, mix it with air and spray it into the flue upstream of the SCR denitrification reactor, and react with the nitrogen oxides in the flue gas under the action of the catalyst to generate harmless nitrogen and water discharge system. Most of the cataly...

AI Technical Summary

Problems solved by technology

This part of the irregular catalyst wet embryo unit together with the main body of the catalyst wet embryo enters the first-level drying, the second-level drying until the final calcination section, and then the finished product is cut to length, which consumes additional resources and causes high energy consumption; On the other hand, these cut waste materials can only be added to the raw materials of the catalyst at a ratio of no more than 5% for the next step of molding after being ground into very fine particles through complex crushing and grinding sections. Part of the waste is discarded, which not only wastes resources but also causes environmental pollution

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