CN201815314U - Honeycombed catalyst provided with regular hexagonal internal pore passage structure and used for SCR denitration technology - Google Patents

Abstract

The utility model relates to a honeycomb catalyst for SCR denitrification technology with a regular hexagonal inner pore structure. in between. The flow rate of the reaction gas in the inner channel of the catalyst is relatively uniform, and the catalyst solid layer around the inner channel has a uniform and equal thickness "Y" shape structure, and the strength of the solid skeleton layer is improved. Its structure is as follows: it includes a catalyst skeleton, and a number of honeycomb-shaped flue gas circulation inner channels are arranged in the catalyst framework, and the cross-section of the inner channels is a regular hexagon.

Description

Honeycomb catalyst for SCR denitrification technology with regular hexagonal inner pore structure

technical field

The utility model relates to a honeycomb catalyst for SCR denitrification technology with a regular hexagonal inner pore structure.

Background technique

With the promulgation and implementation of the "Emission Standards for the Control of Air Pollutants from Thermal Power Plants" and the "Law on the Prevention and Control of Air Pollution", my country's control of NOx emissions has become increasingly stringent. It is estimated that since 2010, there will be at least 200 million kW generating units that need to build denitrification systems. Selective catalytic reduction denitrification technology (SCR technology for short) uses a catalyst to selectively reduce _NOx with reducing agents (such as ammonia and urea) to generate nitrogen and water. The catalyst accounts for a considerable proportion in the construction cost of the SCR denitrification system and needs to be replaced periodically.

At present, there are mainly two types of catalysts commonly used in SCR technology: honeycomb type and flat plate type. The honeycomb catalyst is integrally formed without any other materials as a carrier. The catalyst as a whole has a catalytic effect and has a relatively long service life. Flat-plate catalysts use wire mesh as a carrier, and their effective catalytic components are evenly spread on the metal carrier. Due to the small amount of effective catalytic components per unit volume, the life of flat-plate catalysts is relatively short. In engineering applications, both types of catalysts are packaged into modules, placed in the SCR reactor according to requirements, and can be replaced modularly. At present, honeycomb catalysts are used on a large scale due to the advantages of more active components per unit volume, high catalytic efficiency, and easy modular use.

At present, most of the commonly used honeycomb catalysts are integrally formed, and the effective catalytic components of the catalyst and molding additives are fully mixed and then sent to the molding die to be extruded into a honeycomb catalyst with a regular pore structure. At present, the pores of honeycomb catalysts are mostly circular pores and square pores. This arrangement of pores makes the flow distribution of flue gas more uniform when passing through the catalyst, which is conducive to better adsorption on the surface of the catalyst for reduction reaction when the gas passes through. In addition, circular Regular figures such as squares and squares are more conducive to the production of catalysts. For catalysts with a square inner pore structure, the pore area per unit volume is large, which is conducive to improving the SCR reaction efficiency, but when the gas passes through the square inner pore, the cross-sectional flow velocity is uneven, and the flow velocity at the four corners is low, resulting in the catalyst being unable to be fully utilized; Shaped inner pore structure, the gas flow rate distribution is uniform, but the thickness of the solid reaction layer between the pores is uneven, and the pore area in the unit volume of the catalyst is small, which reduces the utilization rate of the catalyst.

Contents of the invention

The purpose of this utility model is to solve the above problems. A honeycomb catalyst for SCR denitrification technology with a regular hexagonal inner channel structure is proposed. It combines the advantages of square inner channels and circular inner channels, and its fluid flow rate uniformity and The pore area per catalyst cross-sectional area is between the two. The flow rate of the reaction gas in the inner channel of the catalyst is relatively uniform, and the catalyst solid layer around the inner channel has a uniform and equal thickness "Y" shape structure, and the strength of the solid skeleton layer is improved.

The utility model adopts the following technical solutions:

A honeycomb catalyst for SCR denitrification technology with a regular hexagonal inner pore structure, which includes a catalyst skeleton, and a number of honeycomb-shaped flue gas circulation inner holes are arranged in the catalyst skeleton, and the cross-section of the inner holes is a regular hexagon .

The catalyst skeleton is a cube, a cylinder or a polygon.

The catalyst with regular hexagonal internal channel structure of the utility model still adopts a honeycomb shape as a whole, but the flue gas circulation channel on the cross section adopts a regular hexagonal structure. The honeycomb catalyst mold with regular hexagonal inner channel structure is produced by wire cutting. The height of the mold depends on the engineering requirements. It is installed on the equipment for making catalyst modules, and the catalyst reaction components, carriers, additives, etc. are formed by stamping or extrusion. The raw material made of ingredients is made into a honeycomb catalyst with a regular hexagonal inner pore structure.

The beneficial effects of the utility model are:

The honeycomb catalyst adopts a regular hexagonal inner pore structure, and the flow rate of the reaction gas in the inner pore is relatively uniform. At the same time, the regular hexagonal perimeter is long, close to the circular inner pore, which ensures the reaction area when the flue gas passes through, and the surrounding area of the pore The solid layer of the catalyst has a "Y"-shaped structure with uniform thickness, which improves the strength of the catalyst, increases the life of the catalyst, improves the utilization rate of the catalyst, and reduces the operating cost and maintenance cost of the boiler flue gas SCR denitrification system.

Description of drawings

Fig. 1 cube catalyst plan view;

Figure 1a is a perspective view of Figure 1;

Fig. 2 is a plan view of a hexagonal prism catalyst;

FIG. 2a is a perspective view of FIG. 2 .

Among them, 1 inner channel, 2 catalyst skeleton.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Example 1:

In Fig. 1 and Fig. 1a, the cross-section of the honeycomb catalyst skeleton 2 is a square, and the regular hexagonal internal channels 1 are neatly arranged in rows and columns. The side triangles are arranged, and the solid skeleton layer formed between the regular hexagons is a "Y"-shaped structure of equal thickness.

Example 2:

In Fig. 2 and Fig. 2a, the cross-section of the honeycomb catalyst skeleton 2 is a regular hexagon, and the inner channels 1 of the regular hexagon are arranged neatly in rows and columns. Arranged in an equilateral triangle, the solid skeleton layer formed between the regular hexagons is a "Y"-shaped structure of equal thickness.

Claims (2)

1. the SCR denitration technology honeycombed catalyst of a regular hexagon inner duct structure, it comprises catalyst backbone, is provided with the flue gas circulation inner duct of several cellular distributions in the catalyst backbone, it is characterized in that the cross section of described inner duct is a regular hexagon.

2. the SCR denitration technology honeycombed catalyst of regular hexagon inner duct structure as claimed in claim 1 is characterized in that, described catalyst backbone is cube or cylinder or gengon.

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