CN108654368A - Combustion gas SCR denitration module and the method for reducing combustion gas SCR denitration resistance - Google Patents

Abstract

The invention relates to a gas SCR denitration catalyst module, which includes a frame and a half group of catalyst units arranged on the frame. The half group of catalyst units includes two catalyst units, and the angle between the two catalyst units is greater than 0 degrees and less than 180 degrees. . A method for reducing the resistance of a gas-fired SCR denitrification catalyst comprises arranging a catalyst module in a denitration reactor as the above-mentioned gas-fired SCR denitration catalyst module. The present invention changes the plane layout of conventional catalyst modules, adopts an independent frame structure, is convenient for installation, disassembly and transportation, and has no risk of dust accumulation; increases the contact area and residence time between nitrogen oxides and reducing agents in flue gas and catalysts; The disturbance before and after the flue gas enters the catalyst channel strengthens the reaction effect; reduces the flue gas flow rate and resistance in the catalyst channel, and the resistance of the catalyst layer is reduced by 50%-80%, which improves the efficiency of the unit, reduces energy consumption, and consumes less catalyst.

Description

Gas SCR denitrification catalyst module and the method of reducing the resistance of gas SCR denitrification catalyst method

technical field

The invention relates to a gas SCR denitration catalyst module and a method for reducing the resistance of the gas SCR denitration catalyst.

Background technique

At present, under the situation that coal-fired power plants generally implement ultra-low emission of nitrogen oxides, stricter emission limits for nitrogen oxides have been proposed for natural gas-fired boilers and gas turbines. The goal of controlling the emission concentration within 15mg/m ³ or even 5mg/m ³ . In order to achieve such a strict nitrogen oxide emission target, it is necessary to install SCR flue gas denitrification equipment, and to achieve efficient and economical operation of SCR flue gas denitrification facilities.

In order to prevent dust accumulation and other reasons, the traditional SCR denitrification catalyst modules generally adopt the arrangement of unit bodies on the same plane, as shown in Figure 1. This arrangement has the disadvantages of the catalyst arrangement volume in the denitrification reactor with the same area being small and the resistance Relatively high, the denitrification performance of the catalyst is not fully exerted.

Contents of the invention

One object of the present invention is to provide a gas-fired SCR denitrification catalyst module. The new catalyst module structure is different from the conventional catalyst module planar layout, and adopts a folded or misplaced special-shaped structure layout, which is suitable for dust-free natural gas boilers. And gas turbine unit SCR denitrification.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A gas-fired SCR denitration catalyst module, comprising a frame, a half group of catalyst units arranged on the frame, the half group of catalyst units includes two catalyst units, and the formation between the two catalyst units is greater than 0 degree Angles less than 180 degrees.

Preferably, the catalyst module includes a catalyst unit group, the catalyst unit group includes two catalyst unit half groups, the two catalyst unit half groups are arranged oppositely, and the two catalyst unit A space is formed between the half-groups, that is, the two half-group butt joints of the catalyst units are in the shape of a "roof" as a whole, and the number of catalyst units can be arranged in a limited flue section on site, with a larger volume and more space. High utilization rate.

Further preferably, the two half-groups of catalyst units are sealed and connected.

Further preferably, the catalyst unit groups include multiple groups, and two adjacent groups of the catalyst unit groups are sealed and connected, and the number of the catalyst unit groups is determined according to the size of the module.

Preferably, the two catalyst units in the half-group of catalyst units are sealed and connected, such as being fixed by a steel frame structure.

Further preferably, one side of the two catalyst unit groups in the catalyst unit is connected by an angle steel.

Preferably, an included angle of 30-120 degrees is formed between the two catalyst unit groups.

Preferably, the catalyst unit includes a plurality of catalyst monomers, and the plurality of catalyst monomers are bonded with special high-temperature-resistant materials to ensure a high sealing effect.

Further preferably, a plurality of said catalyst monomers are distributed along the up, down, left, and right directions.

Another object of the present invention is to provide a method for reducing the resistance of the gas-fired SCR denitrification catalyst, which can effectively increase the layout area of the catalyst in the same flue cross-section, reduce the flow rate of the flue gas flowing through the catalyst hole, and reduce the resistance of the catalyst layer.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A method for reducing the resistance of a gas-fired SCR denitrification catalyst comprises arranging a catalyst module in a denitration reactor as the above-mentioned gas-fired SCR denitration catalyst module.

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

1. Adopt an independent frame structure, which is convenient for on-site installation, disassembly and transportation, and has no risk of dust accumulation;

2. Greatly increased the contact area of nitrogen oxides in the flue gas and the reducing agent ammonia with the catalyst and the residence time in the catalyst pores;

3. The disturbance before and after the flue gas enters the catalyst channel is intensified, so that the flue gas flows through the catalyst channel more in a "turbulent flow" mode, and the denitrification reaction effect is strengthened;

4. Significantly reduces the flue gas flow rate in the catalyst channel and reduces the resistance of the catalyst layer. Under the same operating conditions of the unit, the resistance of the catalyst layer is reduced by 50%-80% compared with the traditional module structure, which can effectively improve the efficiency of the unit and reduce energy consumption;

5. In the case of achieving the same denitrification performance, the amount of catalyst is smaller.

Description of drawings

Accompanying drawing 1 is the structural representation of prior art;

Accompanying drawing 2 is the structure diagram in this embodiment.

Among them: 1. Frame; 2. Catalyst unit group; 20, 21. Catalyst unit half group; 200, 210. Catalyst unit; 22. Catalyst unit.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

A gas-fired SCR denitration catalyst module as shown in Figure 1 includes a frame 1 and a catalyst unit group 2 set on the frame 1. The number of catalyst unit groups 2 is determined according to the size of the module (three groups in the figure) , the sealing connection between two adjacent groups of catalyst unit groups 2 . The size of the catalyst module can be designed according to the needs of on-site flue layout and denitrification performance, for example, 2m×1m×0-500mm.

The catalyst unit group 2 includes two catalyst unit half groups 20, 21, the two catalyst unit half groups 20, 21 are arranged oppositely, and a space is formed between the two catalyst unit half groups 20, 21, that is, the two catalyst unit half group pairs The buckle is in the shape of a "roof" as a whole, and the two catalyst unit half groups 20, 21 are also sealed and connected.

Catalyst unit half group 20,21 comprises two catalyst units 200,210, forms an included angle between two catalyst units 200,210, and the preferred range of included angle is 30-120 degree, and seals between two catalyst units 200,210 Connections, such as structural (angle iron) fixings with steel frames.

Catalyst units 200 and 210 include a plurality of catalyst units 22 of the same specification (cross-section 150mm×150mm×0-300mm), and the plurality of catalyst units 22 are distributed along the up, down, left, and right directions. The material is bonded to ensure a high sealing effect.

A method for reducing the resistance of gas-fired SCR denitrification catalysts, changing the arrangement of catalyst modules in the denitrification reactor from a conventional single planar structure to a folded multi-planar structure in this embodiment, effectively increasing the size of the catalyst in the same flue section. The layout area is large, the flow rate of flue gas through the catalyst pores is reduced, and the resistance of the catalyst layer is reduced.

The above-mentioned embodiments are only to illustrate the technical conception method and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. a kind of combustion gas SCR denitration module, it is characterised in that：Including frame, the catalysis being arranged on the frame Half group of agent unit, half group of the catalyst elements are including two catalyst elements, shape between the catalyst elements described in two At the angle for being less than 180 degree more than 0 degree.

2. combustion gas SCR denitration module according to claim 1, it is characterised in that：The catalyst module packet Catalyst elements group is included, the catalyst elements group includes half group of catalyst elements described in two, the catalysis described in two Half group of agent unit is oppositely arranged, and forms space between half group of the catalyst elements described in two.

3. combustion gas SCR denitration module according to claim 2, it is characterised in that：Catalyst list described in two It is tightly connected between half group of member.

4. combustion gas SCR denitration module according to claim 2, it is characterised in that：The catalyst elements group Including multigroup, it is tightly connected between the catalyst elements group described in two adjacent groups.

5. combustion gas SCR denitration module according to claim 1, it is characterised in that：The catalyst elements half It is tightly connected between the catalyst elements described in two in group.

6. combustion gas SCR denitration module according to claim 5, it is characterised in that：In the catalyst elements Two described in catalyst elements groups pass through Bolted angle connection on one side.

7. combustion gas SCR denitration module according to claim 1, it is characterised in that：Catalyst list described in two The angle of 30-120 degree is formed between tuple.

8. combustion gas SCR denitration module according to claim 1, it is characterised in that：The catalyst elements packet Include multiple catalyst monomers.

9. combustion gas SCR denitration module according to claim 8, it is characterised in that：Multiple catalyst lists Vertically left and right directions is distributed body.

10. a kind of method reducing combustion gas SCR denitration resistance, it is characterised in that：By the catalyst in Benitration reactor Module arrangement is at the combustion gas SCR denitration module described in any one of claim 1 to 9 claim.