CN116689042A - Low-resistance flat plate type catalyst, catalyst unit and application method thereof - Google Patents

Abstract

The invention discloses a low-resistance flat plate catalyst, a catalyst unit and an application method thereof, wherein a plurality of folds are arranged on the low-resistance flat plate catalyst in parallel, the wave angle of the low-resistance flat plate catalyst is 5-45 degrees, the plate width is not higher than 20mm, and the pitch is not higher than 3mm. In the invention, a low-resistance flat plate catalyst is designed firstly, then two low-resistance flat plate catalysts are utilized to manufacture a catalyst unit according to a cross arrangement mode, the catalyst unit is provided with a plurality of cross nodes, the flue gas at the cross nodes can flow downstream only by changing the flow direction, the flue gas can generate at least two-direction flue gas turbulence in the catalyst unit, the turbulence is enhanced, the mass transfer coefficient of the catalyst surface is obviously improved, the catalyst activity is obviously improved, the catalyst resistance is obviously reduced, the overall performance is obviously improved, and the catalyst unit is equivalent to the performance and the resistance of a honeycomb type or corrugated plate type catalyst for a fuel machine under the same condition and is suitable for the application of denitration engineering of the fuel machine.

Description

A low-resistance flat-plate catalyst, catalyst unit and application method thereof

technical field

The invention belongs to the technical field of flat-plate catalysts, and in particular relates to a low-resistance flat-plate catalyst, a catalyst unit and an application method thereof.

Background technique

At present, selective catalytic reduction (SCR) flue gas denitrification technology is the main feasible technology for gas turbine denitrification. Catalyst is the core of SCR denitrification technology. Compared with conventional coal-fired units, denitrification of gas turbine units requires lower resistance and higher efficiency. Therefore, the catalyst mainly adopts imported catalysts with small pore size, high specific surface area and high activity, and honeycomb catalysts with a pitch of 3.0mm and below It is mainly used with corrugated plate catalysts, and the "folding fan" arrangement is used together to reduce catalyst resistance.

GB/T 31584 stipulates the current traditional flat-plate catalyst. By uniformly coating the active component on the surface of the metal mesh, forming folds according to certain specifications, and finally cutting to form a single plate, the catalyst module is formed by fixing and assembling. The flue gas contacts and reacts with the active components on the surface of the catalyst to remove nitrogen oxides. The structure of the flat-plate catalyst is relatively simple, the catalyst resistance is smaller than that of the honeycomb and corrugated plate catalysts, and the production cycle is shorter, and the domestic manufacturing technology is mature. However, the specific surface area of the flat-plate catalyst specified in GB/T 31584 is 300-350m ² / m ³ , according to the current denitrification requirements of gas turbines, the volume of flat-plate catalysts is significantly higher than that of honeycomb and corrugated plate catalysts, and the catalyst resistance is 2 to 4 times that of honeycomb catalysts and corrugated plate catalysts with the same performance, which does not meet the requirements of current gas turbines. Due to the requirement of low resistance, it cannot be used on gas turbines. Therefore, it is of great significance to develop a high-efficiency low-resistance flat-plate catalyst suitable for denitrification of gas turbine units.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is already known in the art to a person of ordinary skill in the art.

Contents of the invention

In order to solve the technical problems in the prior art, the object of the present invention is to provide a low-resistance flat-plate catalyst, a catalyst unit and an application method thereof.

In order to achieve the above object and achieve the above technical effect, the technical solution adopted in the present invention is:

A low-resistance flat-plate catalyst, the low-resistance flat-plate catalyst is provided with several folds in parallel, the wave angle of the low-resistance flat-plate catalyst is 5° to 45°, and the plate width is not higher than 20mm. The pitch is not greater than 3mm.

Further, at least 15 folds are arranged in parallel at equal intervals on the low-resistance flat-plate catalyst.

The invention also discloses a catalyst unit, which includes a plurality of low-resistance flat-plate catalysts stacked from top to bottom. The adjacent low-resistance flat-plate catalysts form several intersection nodes, and the geometric specific surface area of the catalysts in the catalyst unit is not less than 700m ² /m ³ .

Further, the length and width of the catalyst unit are respectively 400-500 mm.

The invention also discloses the application of the above-mentioned catalyst unit in gas turbine denitrification.

The application method of the catalyst unit disclosed in the present invention in gas turbine denitrification comprises the following steps:

The catalyst units are combined according to certain rules to form a module, with the module as the basic unit, combined with the requirements and size of the denitrification reactor, placed in a suitable position of the denitrification reactor, when the flue gas flows through the catalyst module, there will be multiple blows in two different directions Smoke spoiler.

Compared with prior art, the beneficial effect of the present invention is:

The invention discloses a low-resistance flat-plate catalyst, a catalyst unit and an application method thereof. Several folds are arranged in parallel on the low-resistance flat-plate catalyst, and the wave angle of the low-resistance flat-plate catalyst is 5° to 45°. , the plate width is not higher than 20mm, and the pitch is not larger than 3mm. The low-resistance flat-plate catalyst, the catalyst unit and its application method provided by the present invention firstly design a suitable number of folds, wave angles of suitable size, plate width and pitch to obtain a low-resistance flat-plate catalyst, and then use multiple low-resistance Resistant flat-plate catalysts are made into catalyst units in a cross-arrangement manner, and the fold directions on two adjacent low-resistance flat-plate catalysts are arranged non-parallel. The advantage of this design is that multiple cross nodes are formed in the catalyst unit. The flue gas must change the flow direction to flow downstream, and the disturbance is strengthened. Affected by the wave angle and cross arrangement, the internal flue gas flow is more severe, and the flue gas can have at least two flue gas disturbances in different directions in the catalyst unit. The flue gas turbulence in different directions is continuously superimposed, which further strengthens the disturbance. The superposition of various factors makes the mass transfer coefficient of the catalyst module significantly improved, the catalyst activity is significantly improved, the overall performance is significantly improved, and the volume of the catalyst is greatly reduced. , the catalyst resistance has been significantly reduced. Under the same conditions, it is equivalent to the performance and resistance of traditional honeycomb or corrugated plate catalysts for gas turbines, and is suitable for gas turbine denitrification engineering applications.

Description of drawings

Fig. 1 is the front view structural representation of catalyst I of the present invention;

Fig. 2 is the front view structural representation of catalyst II of the present invention;

Fig. 3 is the three-dimensional structure schematic diagram of catalyst I of the present invention;

Fig. 4 is the three-dimensional structure schematic diagram of catalyst II of the present invention;

Fig. 5 is the front structural representation of catalyst unit of the present invention;

Fig. 6 is the schematic diagram of the three-dimensional structure of the catalyst unit of the present invention;

Fig. 7 is a comparison diagram of the flue gas flow situation between the catalyst module of the present invention and the traditional flat catalyst, wherein, Figure A is the flue gas flow diagram of the catalyst module of the present invention, and Figure B is the flue gas flow situation of the traditional flat catalyst picture.

Detailed ways

The present invention is described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

A brief summary of one or more aspects is presented below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all contemplated aspects and is intended to neither identify key or critical elements of all aspects nor attempt to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

As shown in Figures 1-7, the present invention discloses a low-resistance flat-plate catalyst on which at least 15 folds 100 are arranged in parallel. The plate width 101 of the low-resistance flat-plate catalyst is not higher than 20mm, and the wave angle 102 is 5°-45°, the pitch 103 is not greater than 3mm, the values of plate width 101, wave angle 102, and pitch 103 can be flexibly selected according to actual needs.

The invention also discloses a catalyst unit, the length a and the width b are respectively 400-500 mm, including a plurality of low-resistance flat-plate catalysts stacked from top to bottom, and two adjacent low-resistance flat-plate catalysts are respectively Denoted as Catalyst I11 and Catalyst II12, the wrinkle directions on Catalyst I11 and Catalyst II12 are not parallel, Catalyst I11 and Catalyst II12 have the same structure except for different wrinkle directions, two adjacent low-resistance flat-plate catalysts in the catalyst unit form There are several intersection nodes 20, and the geometric specific surface area of the catalyst in the catalyst unit is not less than 700m ² /m ³ .

The invention also discloses the application of a catalyst unit in gas turbine denitrification.

The application method of the catalyst unit provided by the present invention in gas turbine denitrification comprises the following steps:

Combine the catalyst units in a fixed array in the direction of a×b (length×width) to form a module, take the module as the basic unit, and combine the requirements and dimensions of the denitration reactor, choose an appropriate way to place it in the direction of a×b In the denitrification reactor, when the flue gas flows through the catalyst unit, flue gas turbulence in different directions will occur multiple times, and the flue gas turbulence in different directions can be continuously superimposed to strengthen the disturbance and help to improve the catalyst activity.

Example 1

As shown in Figure 1-7, a low-resistance flat-plate catalyst has 15 folds 100 arranged in parallel at equal intervals. The plate width 101 of the low-resistance flat-plate catalyst is 18 mm, and the wave angle 102 is 30°. The pitch 103 is 3mm.

A catalyst unit, including a plurality of low-resistance flat-plate catalysts placed from top to bottom, the length a and width b of the catalyst unit are respectively 464 mm, and two adjacent low-resistance flat-plate catalysts are respectively denoted as catalyst I11, catalyst II12, the wrinkle directions on the catalyst I11 and the catalyst II12 are not parallel, the structure of the catalyst I11 and the catalyst II12 is completely the same except for the wrinkle direction, and several intersection nodes 20 are formed on two adjacent low-resistance flat-plate catalyst veneers, The geometric specific surface area of the catalyst in the catalyst unit is not less than 700m ² /m ³ .

This embodiment discloses the application of the above-mentioned catalyst unit in gas turbine denitrification.

The application method of the catalyst unit provided in this embodiment in gas turbine denitrification includes the following steps:

Combine the catalyst units in a fixed array (2×4) in the a×b direction to form a module, take the module as the basic unit, and combine the requirements and dimensions of the denitration reactor, choose an appropriate way to place it in the a×b direction In the denitrification reactor, the flue gas 31 flowing through the catalyst unit will have flue gas disturbance in two different directions, specifically: flue gas disturbance I 32, flue gas disturbance II 33, and the flue gas disturbance in different directions can be continuously Superposition strengthens the disturbance and makes the internal smoke flow more intense. In addition, due to the existence of multiple intersection nodes 20, the smoke at the intersection node 20 must change the flow direction to flow downstream, which further strengthens the disturbance, and multiple factors are superimposed The mass transfer coefficient on the surface of the catalyst module is obviously improved.

The formula for calculating the activity k of the known catalyst is:

Among them, K _chem is the chemical activity coefficient, h _m is the mass transfer coefficient. K _chem is controlled by the chemical composition, and it is a fixed value when the formula is determined. The exchange between the catalyst surface and the flue gas is relatively stable, so the mass transfer coefficient h _m of the catalyst module is higher than that of the traditional flat-plate catalyst, so that the activity k of the catalyst module has been significantly improved, which is better than the activity of the traditional flat-plate catalyst .

Comparative example 1

A commercially available honeycomb catalyst is used.

Comparative example 2

A corrugated plate catalyst purchased in the market is used.

The performance of the catalysts in Example 1 and Comparative Examples 1-2 were tested in the laboratory according to the method specified in DL/T 1286 "Technical Specifications for Detection of Catalysts for Flue Gas Denitration in Thermal Power Plants". The test results are shown in Table 1.

Table 1

It can be seen from Table 1 that the catalyst designed by the present invention has the same performance and resistance as honeycomb or corrugated plate catalysts, and realizes high efficiency, low resistance, economical and reliable operation of gas turbine denitrification, and is suitable for gas turbine denitrification engineering applications.

The parts or structures not specifically described in the present invention can adopt the prior art or existing products, and will not be repeated here.

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the content of the description of the present invention, or directly or indirectly used in other related technical fields, shall be The same reasoning is included in the patent protection scope of the present invention.

Claims (6)

1. A low-resistance flat-plate catalyst is characterized in that several folds are arranged in parallel on the low-resistance flat-plate catalyst, and the wave angle of the low-resistance flat-plate catalyst is 5°～45°. The width is not higher than 20mm, and the pitch is not larger than 3mm. 2. A low-resistance flat-plate catalyst according to claim 1, characterized in that at least 15 folds are arranged in parallel at equal intervals on the low-resistance flat-plate catalyst. 3. A catalyst unit, characterized in that it comprises a plurality of low-resistance flat-plate catalysts stacked from top to bottom, and the fold directions on two adjacent low-resistance flat-plate catalyst veneers are not parallel, and the catalyst Adjacent low-resistance flat-plate catalysts in the unit form several intersection nodes, and the geometric specific surface area of the catalyst in the catalyst unit is not less than 700m ² /m ³ . 4. A catalyst unit according to claim 3, characterized in that the length and width of the catalyst unit are respectively 400-500 mm. 5. The application of a catalyst unit according to claim 3 in gas turbine denitrification. 6. The application method of a catalyst unit in gas turbine denitrification according to claim 5, characterized in that it comprises the following steps: The catalyst units are combined according to certain rules to form a module, with the module as the basic unit, combined with the requirements and size of the denitrification reactor, placed in a suitable position of the denitrification reactor, when the flue gas flows through the catalyst module, there will be multiple blows in two different directions Smoke spoiler.