CN220496005U

CN220496005U - Ammonia spraying grille adopting diamond-section ammonia spraying pipeline

Info

Publication number: CN220496005U
Application number: CN202321823984.4U
Authority: CN
Inventors: 夏怀鹏; 王凯亮; 吴冲; 汪洋; 王争荣; 耿宣; 张锡乾; 王毅成
Original assignee: China Huadian Engineering Group Co Ltd; Huadian Environmental Protection Engineering and Technology Co Ltd
Current assignee: China Huadian Engineering Group Co Ltd; Huadian Environmental Protection Engineering and Technology Co Ltd
Priority date: 2023-07-12
Filing date: 2023-07-12
Publication date: 2024-02-20
Anticipated expiration: 2033-07-12

Abstract

The utility model provides an ammonia spraying grid adopting an ammonia spraying pipeline with a diamond-shaped cross section, which comprises a plurality of ammonia spraying pipelines which are arranged in parallel, wherein the ammonia spraying pipelines are horizontally fixed on the inner wall of a flue, each ammonia spraying pipeline comprises a full diamond pipeline and a half diamond pipeline, the cross section of each full diamond pipeline is of a diamond structure, the cross section of each half diamond pipeline is of a half diamond structure identical to the lower half part of each full diamond pipeline, the middle part of each full diamond pipeline is divided into an upper part and a lower part which are identical through a middle baffle plate, a plurality of first nozzles are sequentially and alternately arranged on two sides of the top of each full diamond pipeline, and a plurality of second nozzles are sequentially and alternately arranged on two sides of the top of each half diamond pipeline. The diamond-shaped pipeline replaces the ammonia spraying pipeline with the circular section, and can greatly reduce the blocking area of flue gas under the condition that the sectional areas are completely equal, thereby ensuring the deamination efficiency of the system, effectively reducing the resistance of the system, increasing the path and area of mass transfer and improving the deamination efficiency.

Description

Ammonia spraying grille adopting diamond-section ammonia spraying pipeline

Technical Field

The utility model relates to the technical field of denitration ammonia spraying devices, in particular to an ammonia spraying grid adopting an ammonia spraying pipeline with a diamond-shaped cross section.

Background

At present, in the flue gas denitration project of a power plant, urea is adopted to replace liquid ammonia for flue gas denitration, an ammonia spraying grid is arranged at the vertical section of a denitration reactor and is used for spraying ammonia gas, and nitrogen oxides are reacted in the reactor to be removed. The existing ammonia spraying grille is made of round steel pipes, holes are formed in the round pipes, and nozzles with different angles are welded in a crossing mode so as to achieve spraying coverage of ammonia.

After urea replaces liquid ammonia, because the temperature of urea is higher, original ammonia spraying grid need be changed into the pipeline that the diameter is bigger just can satisfy the efficiency of denitration. The ammonia injection grids are arranged in parallel side by side in the flue, and generally are arranged in two layers in a staggered manner for the uniformity of injection. The ammonia spraying grille of each layer consists of two pipelines which are welded together in parallel, wherein one pipeline is responsible for spraying and covering half of the width of the flue, and the other pipeline is responsible for spraying and covering the other half of the flue.

The projection area of the pipeline of the ammonia injection grid with the structure almost occupies more than half of the cross-sectional area of the whole flue, the effective cross section of the flue gas passing through is reduced, and the resistance and the energy consumption of the system are greatly increased. In order to reduce the system resistance and energy consumption, the wind shielding area of an ammonia spraying pipeline is reduced as much as possible on the premise of not influencing the ammonia spraying effect, so that the system resistance is reduced, the system efficiency is improved, and the accurate energy conservation and consumption reduction are realized.

Disclosure of Invention

The utility model aims to provide an ammonia spraying grid adopting an ammonia spraying pipeline with a diamond section, which reduces the resistance of a system by adopting the pipeline with the diamond section, optimizes the flow field of flue gas, reduces the flow velocity of the flue gas, and increases the mass transfer efficiency and the denitrification efficiency.

According to the purpose of the utility model, the ammonia spraying grid adopting the diamond-shaped cross-section ammonia spraying pipeline comprises a plurality of ammonia spraying pipelines which are arranged in parallel, wherein two ends of each ammonia spraying pipeline are respectively and horizontally fixed on the inner wall of a flue, each ammonia spraying pipeline comprises a full diamond pipeline and a half diamond pipeline, the cross section of each full diamond pipeline is of a diamond structure, the cross section of each half diamond pipeline is of a half diamond structure identical to the lower half part of each full diamond pipeline, the middle part of each full diamond pipeline is divided into an upper part and a lower part which are identical through a middle baffle, a plurality of first nozzles are alternately arranged on two sides of the top of each full diamond pipeline in sequence, and a plurality of second nozzles are alternately arranged on two sides of the top of each half diamond pipeline in sequence.

Further, one end of the full diamond pipeline, which is close to the half diamond pipeline, is provided with a plugging plate.

Further, the ammonia spraying pipeline is formed by welding steel plates.

Further, the ammonia spraying pipeline is connected with an ammonia spraying main pipe, and a check valve is arranged on the ammonia spraying main pipe.

Further, the short diagonal line of the ammonia spraying pipeline is perpendicular to the flow direction of the flue gas in the flue, and the long diagonal line of the ammonia spraying pipeline is parallel to the flow direction of the flue gas in the flue.

Further, the length ratio of the long diagonal to the short diagonal is A, and A is more than 1.01 and less than or equal to 20.

Further, protection plates are respectively arranged below the first nozzle and the second nozzle.

Further, the first nozzle and the second nozzle are obliquely arranged on the ammonia spraying pipeline, and an included angle between the central lines of the first nozzle and the second nozzle and the vertical plane is 35-50 degrees.

Further, the first nozzle and the second nozzle comprise a diffusion pipe, a rotary cap and rotary blades, the diffusion pipe is fixed on the ammonia spraying pipeline through threads, the diffusion pipe is fixedly connected with the rotary cap through a connecting frame, one end of the connecting frame is fixedly connected with the diffusion pipe, and the other end of the connecting frame is rotationally connected with the central position of the rotary cap.

Further, the number of the ammonia spraying grids is multiple, and the ammonia spraying grids are oppositely arranged in the flue in pairs along the flow direction of the flue gas in the flue.

According to the technical scheme, the diamond-section pipeline is used for replacing the circular-section ammonia spraying pipeline, and under the condition that the sectional areas are completely equal, the ammonia spraying flow of the system is unchanged, and the effect of removing nitrogen oxides can be ensured; the blocking area of the flue gas can be greatly reduced, the deamination efficiency of the system is ensured, the system resistance is effectively reduced, the mass transfer path and area are increased, and the deamination efficiency is improved. Meanwhile, the bending resistance of the diamond-shaped ammonia spraying pipeline is better than that of a circular pipeline with the same cross section, and the deformation is smaller.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic structural diagram of the F direction in FIG. 1 according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of D-D of FIG. 1 in accordance with an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of E-E of FIG. 1 in accordance with an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a layout structure of a grille according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a nozzle according to an embodiment of the present utility model;

in the figure: 1. an ammonia spraying pipeline; 101. a full diamond pipe; 102. a semi-diamond pipe; 103. an intermediate baffle;

2. the inner wall of the flue; 3. an ammonia spraying main pipe; 4. a check valve; 5. a short diagonal; 6. a long diagonal; 7. a first nozzle; 8. a second nozzle; 9. a protective plate; 10. a diffusion tube; 11. rotating the cap; 12. rotating the blades; 13. a plugging plate; 14. and a connecting frame.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, 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", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in figures 1-6 of the drawings,

an ammonia spraying grid adopting diamond-section ammonia spraying pipelines comprises a plurality of ammonia spraying pipelines 1 which are arranged in parallel, wherein the ammonia spraying pipelines 1 can be formed by welding steel plates, and two ends of the plurality of ammonia spraying pipelines 1 are respectively and horizontally fixed on the inner wall 2 of a flue.

Specifically, during installation, angle steel can be welded at the end part of the ammonia spraying pipeline 1, and holes are formed in the angle steel, so that the angle steel is connected with a fixed beam on the inner wall 2 of the flue through bolts. The ammonia injection pipes 1 are connected to an ammonia injection main pipe 3, ammonia gas is supplied to each ammonia injection pipe 1 through the ammonia injection main pipe 3, and a check valve 4 is provided in the ammonia injection main pipe 3.

Each ammonia spraying pipeline 1 comprises a full-diamond pipeline 101 and a half-diamond pipeline 102 which are fixedly connected together and communicated with each other, the cross section of the full-diamond pipeline 101 is of a diamond structure, and the cross section of the half-diamond pipeline 102 is of a half-diamond structure identical to the lower half part of the full-diamond pipeline 101. The side wall of the bottom of the ammonia spraying pipeline 1 with the diamond structure forms a flue gas air deflector for guiding flue gas. The middle part of the full diamond-shaped pipeline 101 divides the full diamond-shaped pipeline 101 into an upper part and a lower part through a middle baffle 103, and the lower half part of the full diamond-shaped pipeline 101 and the half diamond-shaped pipeline 102 are mutually fixed and communicated into a whole. And a plugging plate 13 is welded at the extreme end of the full diamond pipeline 101 for plugging.

The short diagonal 5 of the ammonia spraying pipeline 1 is vertical to the flow direction of the flue gas in the flue, and the long diagonal 6 of the ammonia spraying pipeline 1 is parallel to the flow direction of the flue gas in the flue.

In this embodiment, the ratio of the length of the long diagonal 6 to the short diagonal 5 is A,1.01 < A.ltoreq.20. On the premise of ensuring the bending resistance of the ammonia injection pipeline 1, the longer the long diagonal line 6 is, the shorter the short diagonal line 5 is, and on the premise of ensuring the bending resistance of the ammonia injection pipeline 1, the longer the A value is, the longer the long diagonal line 6 is, and the shorter the short diagonal line 5 is, preferably, used.

Under the premise that the diamond-shaped cross-sectional area of the ammonia spraying pipeline 1 is equal to the circular cross-sectional area in the prior art, namely under the condition that the ammonia spraying flow is unchanged, as the short diagonal line 5 is perpendicular to the flow direction of the flue gas, under the premise that the length of the ammonia spraying pipeline 1 is unchanged, the projection area of the ammonia spraying pipeline 1 is the product of the length of the short diagonal line 5 and the length of the ammonia spraying pipeline 1, the blocking area of the flue gas can be greatly reduced, the deamination efficiency of a system is ensured, the system resistance is effectively reduced, the path and the area of mass transfer are increased, and the deamination efficiency is improved. The reduction of the system resistance can realize energy conservation; the ammonia removal efficiency can be improved, and the using amount of urea can be saved. Meanwhile, the bending resistance of the diamond ammonia spraying pipeline 1 is better than that of a circular pipeline with the same cross section, and the deformation is smaller. In addition, due to the diamond shape, the flow of the flue gas can be guided, the flue gas flows smoothly, and the abrasion to the ammonia spraying pipeline 1 is small.

A plurality of first nozzles 7 are alternately arranged on two sides of the top of the full diamond pipeline 101 in sequence, and a plurality of second nozzles 8 are alternately arranged on two sides of the top of the half diamond pipeline 102 in sequence. The lower parts of the first nozzle 7 and the second nozzle 8 are respectively provided with an anti-abrasion and anti-blocking protection plate 9, and the protection plate 9 is fixed on the side wall of the ammonia injection pipeline 1.

The first nozzle 7 and the second nozzle 8 are arranged on the ammonia spraying pipeline 1 in an inclined manner, and the first nozzle 7 and the second nozzle 8 are arranged on the ammonia spraying pipeline 1 in an inclined manner, so that the range of ammonia spraying is wider, and the deamination efficiency can be improved.

The included angle between the central line of the first nozzle 7 and the second nozzle 8 and the vertical plane is B, the included angle is more than or equal to 35 degrees and less than or equal to 50 degrees, and the vertical plane is a plane in which the long diagonal 6 is located and is perpendicular to the cross section.

The first nozzle 7 and the second nozzle 8 comprise a diffusion pipe 10, a rotary cap 11 and a rotary blade 12, one end of the diffusion pipe 10 is provided with external threads, a plurality of screw holes are formed in the ammonia spraying pipeline 1, the diffusion pipe 10 is fixed on the ammonia spraying pipeline 1 through the external threads at one end, the detachable connection between the nozzle and the ammonia spraying pipeline 1 is realized through a threaded connection mode, and maintenance and replacement between the pipeline and the nozzle are realized.

The other end of the diffusion tube 10 is fixedly connected with a rotary cap 11 through a connecting frame 14, one end of the connecting frame 14 is fixedly connected with the diffusion tube 10, and the other end of the connecting frame 14 is rotationally connected with the central position of the rotary cap 11, so that the rotary cap 11 can freely rotate. The rotary cap 11 is of a truncated cone structure, and a plurality of rotary blades 12 distributed in a thread shape are fixed on the outer surface wall of the rotary cap 11. Ammonia gas is sprayed out through the first nozzle 7 and the second nozzle 8, and air pressure impacts the rotating blades 12 to drive the rotating cap 11 to rotate, so that the ammonia gas is split into various directions.

As shown in fig. 5, in this embodiment, the number of ammonia injection grids disposed in the flue is plural, and the ammonia injection grids are disposed in the flue in a pair by pair along the flue gas flowing direction in the flue. The nozzles on the ammonia spraying pipelines 1 of the ammonia spraying grids are alternately arranged upwards and downwards in turn, so that the mixing and turbulent flow of the flue gas and the ammonia gas are further enhanced.

According to the manufacturing method of the ammonia spraying pipeline 1, firstly, the sectional area of the required ammonia spraying grid pipeline is calculated according to the technological requirements, then the lengths of the long axis and the short axis of the diamond are converted according to the principle of equal area, the diamond section of the front half section of the grid is determined according to the total area, the full diamond pipeline 101 is formed through welding steel plates, a baffle plate is welded in the middle of the full diamond pipeline 101, the section of the full diamond pipeline 101 is divided into two equal parts, sealing is welded between the two parts, and a plugging plate 13 is welded at the extreme end of the full diamond pipeline 101 for plugging. The two side walls of the lower half side of the full diamond pipe 101 and the baffle plate extend to the flue inner wall 2 to form a half diamond pipe 102.

According to the utility model, after urea is transformed to replace liquid ammonia, the original ammonia spraying grid is transformed, a diamond-section pipeline is used to replace a circular-section ammonia spraying pipeline 1, two pipelines on the same layer are combined, and an anti-abrasion and anti-blocking protection plate 9 is locally arranged at the nozzle. Under the condition that the sectional areas are completely equal, the ammonia spraying flow of the system is unchanged, and the effect of removing nitrogen oxides can be ensured; the long axis of the diamond-shaped pipeline is parallel to the direction of the flow velocity of the flue gas, the short axis of the diamond-shaped pipeline is perpendicular to the flow velocity of the flue gas, and under the arrangement, the projection area of the ammonia spraying pipeline 1 can be greatly reduced, so that the resistance of a system is reduced, the flow field of the flue gas is optimized, the flow velocity of the flue gas is reduced, and the mass transfer efficiency and the denitrification efficiency are improved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. The ammonia spraying grid is characterized by comprising a plurality of ammonia spraying pipelines which are arranged in parallel, wherein the ammonia spraying pipelines are horizontally fixed on the inner wall of a flue, each ammonia spraying pipeline comprises a full-diamond pipeline and a half-diamond pipeline, the cross section of each full-diamond pipeline is of a diamond structure, the cross section of each half-diamond pipeline is of a half-diamond structure identical to the lower half of each full-diamond pipeline, the middle part of each full-diamond pipeline is divided into an upper part and a lower part which are identical through a middle baffle, a plurality of first nozzles are sequentially and alternately arranged on two sides of the top of each full-diamond pipeline, and a plurality of second nozzles are sequentially and alternately arranged on two sides of the top of each half-diamond pipeline; the first nozzle and the second nozzle comprise a diffusion pipe, a rotary cap and rotary blades, the diffusion pipe is fixed on the ammonia spraying pipeline through threads, the diffusion pipe is fixedly connected with the rotary cap through a connecting frame, one end of the connecting frame is fixedly connected with the diffusion pipe, and the other end of the connecting frame is rotationally connected with the central position of the rotary cap.

2. The ammonia injection grid adopting the diamond-section ammonia injection pipeline according to claim 1, wherein a plugging plate is arranged at one end of the full diamond pipeline close to the half diamond pipeline.

3. The ammonia injection grid employing diamond-section ammonia injection pipes according to claim 1, wherein the ammonia injection pipes are formed by welding steel plates.

4. The ammonia injection grid adopting the diamond-shaped cross-section ammonia injection pipeline according to claim 1, wherein the ammonia injection pipeline is connected with an ammonia injection main pipe, and a check valve is arranged on the ammonia injection main pipe.

5. The ammonia injection grid employing diamond-section ammonia injection pipes according to claim 1, wherein the short diagonal of the ammonia injection pipe is perpendicular to the flow direction of the flue gas in the flue, and the long diagonal of the ammonia injection pipe is parallel to the flow direction of the flue gas in the flue.

6. The ammonia injection grid employing diamond-section ammonia injection pipes according to claim 5, wherein the length ratio of the long diagonal to the short diagonal is a, and 1.01 < a is equal to or less than 20.

7. The ammonia injection grid using the diamond-section ammonia injection pipeline according to claim 1, wherein protection plates are respectively arranged below the first nozzle and the second nozzle.

8. The ammonia injection grid employing an ammonia injection pipeline with a diamond-shaped cross section according to claim 1, wherein the first nozzle and the second nozzle are obliquely arranged on the ammonia injection pipeline, and an included angle between a central line of the first nozzle and the second nozzle and a vertical plane is 35-50 °.

9. The ammonia injection grid adopting the diamond-shaped cross-section ammonia injection pipeline according to claim 1, wherein the number of the ammonia injection grids is multiple, and the ammonia injection grids are oppositely arranged in the flue in pairs along the flow direction of the flue gas in the flue.