Flue gas denitration filtering device

Abstract

This invention relates to the field of flue gas filtration technology, and in particular to a flue gas denitrification filtration device, comprising: a modular frame consisting of a column, a cover plate, side plates, and a base plate; multiple arc-shaped brackets, symmetrically arranged within the frame and fixedly connected to the column; and multiple filter units arranged on the arc-shaped brackets, forming at least one set of opposing arc-shaped filter surfaces. This invention, by setting multiple arc-shaped brackets and forming relatively symmetrical arc-shaped filter surfaces, significantly increases the effective flue gas contact area of ​​the filter units within a limited space. Compared to traditional planar arrangements, the arc-shaped structure allows for more thorough contact between the flue gas and the catalyst, thereby greatly improving denitrification efficiency within the same volume, making it particularly suitable for space-constrained gas turbine generator sets.

Description

Technical Field

[0001] This invention relates to the field of flue gas filtration technology, and in particular to a flue gas denitrification filtration device. Background Technology

[0002] With increasingly stringent environmental protection requirements, gas turbine generator sets are widely used due to their high efficiency and cleanliness. However, the limited space in gas turbine units places higher demands on the volume, efficiency, and resistance of denitrification devices. Traditional SCR denitrification catalyst modules mostly adopt a planar arrangement, which is suitable for coal-fired units, but suffers from low space utilization, small flue gas contact area, high resistance, and easy ash accumulation in gas turbine units. Some improved solutions adopt a fan-shaped arrangement, which increases the specific surface area to some extent, but eddies are easily formed at the corners, leading to uneven local flow velocity, increased pressure drop, and severe ash accumulation, affecting denitrification efficiency and device lifespan. Therefore, there is an urgent need for a denitrification filtration device that combines high contact area, low resistance, and low ash accumulation. Summary of the Invention The purpose of this invention is to provide a flue gas denitrification and filtration device that can solve the above-mentioned technical problems.

[0003] This invention provides a flue gas denitrification and filtration device, comprising: A modular frame consisting of columns, cover plates, side plates, and a base plate; Multiple arc-shaped brackets are arranged symmetrically within the frame and are fixedly connected to the column. Multiple filter units are arranged on the arc-shaped bracket to form at least one set of oppositely arranged arc-shaped filter surfaces.

[0004] Preferably, the arc-shaped structure of the arc-shaped bracket is defined by the arc-shaped included angle formed by fixing its two ends to the column, wherein the central angle θ of the arc-shaped included angle is 10° to 160° and the radius of curvature R is 300mm to 1500mm.

[0005] The formation of an arc angle: Assume there is a complete circle, and the arc bracket is just a segment of the arc cut off from this circle. Draw two straight lines from the start and end points of the arc to the center of the circle. The angle formed by these two straight lines at the center of the circle is the arc angle.

[0006] Preferably, the arc length L of the arc bracket is determined by the formula θ=(L / R)×(180 / π), and the arc is a circular arc or an elliptical arc. When it is an elliptical arc, the radius of curvature is the radius of the circle with the largest radius that is inscribed in the fixed point where the arc bracket and the column are connected.

[0007] Preferably, the filter unit has a cuboid structure, adjacent filter units are bonded together with a high-temperature adhesive, and a high-temperature seal is provided between the filter unit and the arc-shaped bracket.

[0008] Preferably, the high-temperature adhesive is a ceramic adhesive, and the high-temperature sealant is a ceramic fiber sealing cotton.

[0009] Preferably, the column, cover plate, side plate, and bottom plate are all made of carbon steel (such as Q235) and have an anti-corrosion coating on the surface.

[0010] Preferably, the column is fixedly connected to the base plate by screws, and the screws are made of 316L stainless steel.

[0011] Preferably, the arc-shaped bracket has notches at both ends for engaging and fixing with the column, and the arc-shaped bracket is made of carbon steel (such as Q235).

[0012] Preferably, the filter units are arranged in multiple groups on the arc-shaped bracket, and adjacent groups are bonded and fixed together by ceramic adhesive to form a continuous arc-shaped filter surface.

[0013] Preferably, the flow channel cross-sectional shape of the filter unit is one of a triangle, a square, a rectangle, or a hexagon. Furthermore, corrugated structural units can be used in the curved surface arrangement described herein.

[0014] Beneficial effects: This invention significantly increases the effective flue gas contact area of ​​the filter unit within a limited space by setting multiple arc-shaped brackets to form relatively symmetrical arc-shaped filter surfaces. Compared with the traditional planar arrangement, the arc structure allows for more thorough contact between the flue gas and the catalyst, thereby greatly improving the denitrification efficiency in the same volume, making it particularly suitable for gas generator sets with limited space. The arc-shaped filter surface design makes the flue gas flow more closely follow the direction of the curved surface, avoiding the eddies and uneven local flow velocity caused by abrupt changes in angles in the traditional fan-shaped arrangement. This streamlined structure reduces energy loss in flue gas flow, significantly reduces the overall pressure drop, helps reduce fan energy consumption, and improves the economic efficiency of unit operation. The relatively set arc surfaces form a smooth airflow channel, making it less likely for dust in the flue gas to accumulate on the surface of the filter unit under the influence of airflow. At the same time, the arc structure itself has good self-cleaning properties, which, combined with the airflow scouring effect, can effectively solve the problem of easy dust accumulation in traditional structures, extend the service life and maintenance cycle of the catalyst, and ensure the long-term stable and efficient operation of the denitrification system. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the filter unit arrangement in this invention.

[0017] Explanation of reference numerals in the attached drawings: 1-Column, 2-Side plate, 3-Base plate, 4-Arc-shaped bracket, 5-Filter unit. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Example 1 A flue gas denitrification filtration device, such as Figure 1As shown, the device is prepared and assembled as follows: The column 1 is vertically installed using 316L stainless steel screws on the base plate 3; the side plate 2 is assembled and fixed to the column 1, and then sealed with a cover plate (the cover plate is positioned opposite the base plate, not shown in the figure) to form a modular frame; the arc-shaped bracket 4 is installed on the aligned column, the central angle θ of the arc-shaped bracket 4 is 32°, the radius of curvature R is 800mm, and the arc length is calculated to be 446.8mm using the formula θ=(L / R)*(180 / π); the cuboid filter units 5 are arranged in an orderly manner on the arc-shaped bracket, as shown... Figure 2 As shown, multiple filter units are bonded together in pairs with ceramic adhesive, and high-temperature ceramic adhesive is filled into the gaps between the units. The contact points between the filter units and the arc-shaped brackets are sealed with ceramic fiber cotton to complete the overall assembly of the device. The dimensions of each component are designed to be adapted to the actual dimensions of the gas turbine reactor chamber.

[0022] When the device of this embodiment was applied to the flue gas denitrification system of a gas turbine unit, the overall pressure drop of the device was 125 Pa. The effective contact area between the flue gas and the catalyst was increased by 35% compared with the traditional planar device, and the denitrification efficiency reached 98.5%. After 30 days of continuous operation, there was no obvious dust accumulation on the inner wall of the device, and the filter unit showed no wear or cracking.

[0023] Example 2 A flue gas denitrification and filtration device, whose overall structure, material and assembly method are basically the same as those in Example 1, the only difference is that: the central angle θ of the arc included angle of the arc bracket is 45°, the radius of curvature R is 540mm, and the arc length is calculated to be 424.1mm according to the formula θ=(L / R)*(180 / π); the thickness of the ceramic fiber sealing cotton is 3mm.

[0024] When the device of this embodiment was applied to the flue gas denitrification system of a gas turbine unit of the same specification, the overall pressure drop of the device was 131 Pa. The effective contact area between the flue gas and the catalyst was increased by 32% compared with the traditional planar device, and the denitrification efficiency reached 98.1%. After 30 days of continuous operation, there was a small amount of floating dust on the inner wall of the device, which was easy to clean.

[0025] Example 3 A flue gas denitrification and filtration device, whose overall structure, materials and assembly method are basically the same as those in Example 1, the only difference is that: the central angle θ of the arc included angle of the arc bracket is 25°, the radius of curvature R is 800mm, and the arc length is calculated to be 349.1mm according to the formula θ=(L / R)*(180 / π); the thickness of the ceramic fiber sealing cotton is 3mm.

[0026] When the device of this embodiment was applied to the flue gas denitrification system of a gas turbine unit of the same specification, the overall pressure drop of the device was 118 Pa. The effective contact area between the flue gas and the catalyst was increased by 28% compared with the traditional planar device, and the denitrification efficiency reached 97.8%. After 30 days of continuous operation, there was no ash accumulation on the inner wall of the device.

[0027] Comparative Example 1 A conventional planar flue gas denitrification filtration device is prepared using the same Q235 material as in Example 1 for the columns, cover plate, side plate, and bottom plate, fixed with 316L stainless steel screws, sealed with ceramic fiber cotton (3mm thick), and bonded with ceramic adhesive. The cubic filter units are arranged in a planar array, and the dimensions of each component are adapted to the same gas turbine reactor cavity as in Example 1.

[0028] When this comparative device was applied to the flue gas denitrification system of a gas turbine unit of the same specification, the overall pressure drop of the device was 185 Pa. The effective contact area between the flue gas and the catalyst was reduced by 35% compared with Example 1, and the denitrification efficiency was only 89.5%. After 30 days of continuous operation, obvious ash accumulation appeared at the right-angle corner of the device.

[0029] Comparative Example 2 A flue gas denitrification and filtration device is basically the same as that in Example 1 in terms of overall structure, material and assembly method. The only difference is that the central angle θ of the arc-shaped bracket is 170°, the radius of curvature R is 200mm, and the arc length is 593.4mm according to the formula.

[0030] When this comparative device was applied to the flue gas denitrification system of a gas turbine unit of the same specification, the test results showed that due to the small radius of curvature and the large central angle, the flue gas flow was locally turbulent, the overall pressure drop of the device reached 240Pa, the flue gas distribution was uneven, the filter units in some areas had insufficient contact with the flue gas, and some areas were subjected to excessive airflow impact. The denitrification efficiency was only 90.2%, and after 15 days of continuous operation, ash accumulation occurred.

[0031] Comparative Example 3 A folding fan-shaped flue gas denitrification and filtration device is provided. The components are made of the same material as in Example 1. The filtration unit is arranged in a straight fan-shaped folded corner, replacing the arc structure of the present invention with multiple folds. The fold angle is 35°. The size of each component is adapted to the reactor cavity of the same gas turbine unit.

[0032] When this comparative device was applied to the flue gas denitrification system of a gas turbine unit of the same specification, the overall pressure drop of the device was 152 Pa. The flue gas formed a vortex at the corner, and the effective contact area was reduced by 18% compared with Example 1. The denitrification efficiency was 93.5%. After 30 days of continuous operation, ash accumulation appeared at the corner, making ash removal difficult.

[0033] The denitrification filtration performance of the devices in Examples 1-3 and Comparative Examples 1-3 is compared in the table below.

[0034] This invention employs a unique arc-shaped design (with a specific central angle θ), overcoming the problem of traditional right-angle or acute-angle flow channels easily generating severe vortices and large local negative pressures when flue gas changes direction. This allows for a smooth transition in the flue gas flow trajectory and a gradual change in airflow direction, significantly reducing vortex formation, lowering local resistance, and consequently reducing the overall pressure drop of the device. Furthermore, the arc-shaped structure effectively disperses the concentrated airflow at the inlet, resulting in a more uniform flue gas velocity distribution across the entire filtration cross-section. This avoids excessively high or low local velocities. Simultaneously, combined with an optimized radius of curvature, the flue gas flows along the tangential direction of the arc, avoiding energy loss caused by fluid impacting the wall surface and ensuring the safe and economical operation of the power plant.

[0035] The arc-shaped structure of this invention increases the specific surface area within a limited space, reducing localized coating wear of the filter unit caused by airflow scouring and ensuring long-term high-efficiency operation. Furthermore, the uniform flow field and large contact area ensure more sufficient and balanced contact time between the flue gas and the active components of the catalyst, thereby improving activation performance.

[0036] The curved surface of this invention reduces dust deposition, preventing dust from accumulating at corners, thus lowering the risk of catalyst blockage and reducing the frequency of dust removal. Simultaneously, the fly ash particles in the flue gas move smoothly along the streamline, reducing direct erosion of specific areas and minimizing equipment wear and tear.

[0037] The arc-shaped design of this invention allows for flue gas diversion within a smaller reactor volume, simplifies the reactor structure, and reduces the floor space required.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flue gas denitrification and filtration device, characterized in that, include: A modular frame consisting of columns, cover plates, side plates, and a base plate; Multiple arc-shaped brackets are arranged symmetrically within the frame and are fixedly connected to the column. Multiple filter units are arranged on the arc-shaped bracket to form at least one set of oppositely arranged arc-shaped filter surfaces.

2. The flue gas denitrification and filtration device according to claim 1, characterized in that, The arc-shaped structure of the arc-shaped bracket is defined by the arc-shaped included angle formed by its two ends being fixed to the column. The central angle θ of the included angle is 10° to 160°, and the radius of curvature R is 300mm to 1500mm.

3. The flue gas denitrification and filtration device according to claim 2, characterized in that, The arc length L of the arc-shaped bracket is determined by the formula θ=(L / R)×(180 / π), and the arc is a circular arc or an elliptical arc.

4. The flue gas denitrification and filtration device according to claim 1, characterized in that, The filter unit has a cuboid structure, and adjacent filter units are bonded together with a high-temperature adhesive. A high-temperature seal is provided between the filter unit and the arc-shaped bracket.

5. The flue gas denitrification and filtration device according to claim 4, characterized in that, The high-temperature adhesive is a ceramic adhesive, and the high-temperature sealant is a ceramic fiber sealing cotton.

6. The flue gas denitrification and filtration device according to claim 1, characterized in that, The columns, cover plates, side plates, and base plates are all made of carbon steel and have an anti-corrosion coating on the surface.

7. The flue gas denitrification and filtration device according to claim 1, characterized in that, The column is fixedly connected to the base plate by screws, which are made of 316L stainless steel.

8. The flue gas denitrification and filtration device according to claim 1, characterized in that, The arc-shaped bracket has notches at both ends for engaging and fixing with the column. The arc-shaped bracket is made of carbon steel.

9. The flue gas denitrification and filtration device according to claim 5, characterized in that, The filter units are arranged in multiple groups on the arc-shaped bracket, and adjacent groups are fixed together by ceramic adhesive to form a continuous arc-shaped filter surface.

10. The flue gas denitrification and filtration device according to claim 1, characterized in that, The flow channel cross-sectional shape of the filter unit is one of the following: triangle, square, rectangle, or hexagon.

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