An extruder for extruding a honeycomb scr denitrification catalyst

Abstract

The invention relates to a mixing device, in particular to an extruding machine for extruding cellular SCR (Selective Catalytic Reduction) denitration catalyst. The extruding machine comprises a frame, and an upper layer mixing filtering part, a middle layer extruding mechanism and an extruding body which are installed on the frame, wherein the upper layer mixing filtering part and the middle layer extruding mechanism are distributed in a step way from from top to bottom; main body structures of the upper layer mixing filtering part, the middle layer extruding mechanism and the extruding body are the same and comprise screw shafts driven by motors to rotate; the screw shafts are installed inside extruding cavities used for containing materials; a material inlet is connected with the upper part of the extruding cavity of the upper layer mixing filtering part; the outlet of the extruding cavity of the upper layer mixing filtering part is connected with the extruding cavity of the middle layer extruding mechanism; the outlet of the extruding cavity of the middle layer extruding mechanism is connected with the extruding cavity of the extruding body through a vacuum box. The extruding machine is high in extruding pressure, adopts three-layer design, and can effectively filter impurities in raw materials and extrude the high-density cellular SCR denitration catalyst.

Description

technical field [0001] The invention relates to a mixing device, in particular to an extruder for extruding a honeycomb SCR denitration catalyst. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants, coal burning is NO X The main sources of emissions, among which thermal power coal combustion accounts for a large proportion. The Selective Catalytic Reduction (SCR) denitrification technology is the denitrification technology with the highest denitrification efficiency and the most market prospect, and the catalyst is the core of the SCR flue gas denitrification technology. Since the SCR process is mostly arranged in the high ash section between the economizer and the air preheater, the catalyst is in the flue gas with high dust. If the granular catalyst is used, the bed will be blocked, the resistance will increase, and the pressure drop will increase. , the reaction cannot run continuously and stably for a long time, so commercial catalyst...

AI Technical Summary

Problems solved by technology

In the production process of SCR catalyst, the performance of the extruder directly affects the yield of the catalyst. The impurities, water content, and mixing uniformity of the raw materials in the extrusion process will affect the extrusion quality of the catalyst. There is a certain difference in performance, which does not match the extrusion equipment, and there will be problems such as difficult molding and high breakage rate during extrusion

At present, the existing honeycomb ceramic extruders can only extrude fully mixed plastic materials without impurities. Once the raw materials are not mixed uniformly, or there are a few particles of impurities in the raw materials, the product quality will be seriously affected and the product quality will be greatly reduced. Extrusion efficiency

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