Drying and calcination process of a new type of one-piece extruded denitrification catalyst for diesel vehicles

Abstract

The invention discloses a novel drying and calcining process for an integrated extrusion type diesel vehicle denitration catalyst. The novel drying and calcining process comprises primary drying and calcining, during primary drying, intensive type air intake and intensive type air discharge are adopted, so shat uniform and stable air current circulation can be guaranteed, and therefore, a uniform moisture removal effect is achieved; during calcining, a calcining furnace adopts wind-cone-form air intake, and radioactive cone-shaped air with a uniform temperature is formed through a specific cone-shaped air inlet, so that uniformity of hot air can be controlled, and seasoning cracks due to the fact that the catalyst is directly blown by hot air are avoided; and on the premise of reaching indexes such as strength and physical defects of the diesel vehicle denitration catalyst, the percent of pass of finally obtained products is guaranteed.

Description

technical field [0001] The invention belongs to the field of catalytic materials for denitrification of diesel vehicle tail gas, and relates to a drying and calcining process of a novel integrated extruding diesel vehicle denitrification catalyst. Background technique [0002] With the implementation of my country's National IV regulations on diesel vehicle exhaust emissions in early 2015, many domestic diesel vehicle manufacturers are facing the update and upgrade of exhaust emission devices, and the most important and core of them is the catalyst. [0003] At present, there are three mainstream technologies for internal combustion engine exhaust gas treatment in China: [0004] A three-way catalytic device, the basic principle is that carrier ceramics are combined with three-way catalyst materials, and its manufacturing process is divided into vacuum adsorption type and active impregnation type; it is mainly used in the gasoline vehicle industry; due to its carrier ceramic...

AI Technical Summary

Problems solved by technology

However, the current honeycomb denitrification catalyst adopts a combination of primary drying, secondary drying and calcination, while the diesel vehicle denitrification catalyst is integrally formed, and has high requirements for the strength and physical defect indicators of the catalyst. Therefore, the honeycomb denitrification catalyst The calcination process is far from reaching the expected effect, and the qualified rate of finished products is very low

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