Denitration device and ammonia spraying grid assembly thereof

Abstract

The utility model belongs to the technical field of environmental protection equipment, and particularly relates to a denitration device and an ammonia spraying grating assembly thereof, the device comprises an ammonia spraying grating pipeline, an ammonia spraying grating assembly, an ammonia spraying grating assembly and an ammonia spraying grating assembly, the ammonia spraying grating pipeline comprises a main pipe and at least one branch pipe, the branch pipe is communicated with the main pipe, and the main pipe is communicated with an ammonia conveying pipeline; the mounting frame is provided with mounting positions, the number of the mounting positions is matched with that of the branch pipes, and the branch pipes are fixed in the mounting positions through detachable structures; a plurality of threaded holes are formed in the side wall of the flue; wherein the mounting frame is connected with the flue through a flange, the flange is matched with a threaded hole of the flue through a bolt and a nut to form a fastening assembly, and detachable connection of the mounting frame and the flue is achieved. Through the arrangement, only bolts on the flanges need to be dismantled in the whole overhauling process, part of the flue or the catalyst module does not need to be cut and dismantled, operation is easy and convenient, and overhauling time is saved.

Description

Technical Field

[0001] This utility model belongs to the field of environmental protection equipment technology, and in particular relates to a denitrification device and its ammonia injection grid assembly. Background Technology

[0002] Selective catalytic reduction (SCR) denitrification technology is a core process for flue gas treatment in coal-fired power plants and industrial boilers. Its core principle is to evenly distribute a reducing agent (ammonia or urea) into the flue through an ammonia injection grid on the denitrification unit. There, it reacts with nitrogen oxides (NOx) under the action of a catalyst, producing harmless nitrogen and water. The design and operating status of the ammonia injection grid directly affect the uniformity of ammonia distribution, thus determining the denitrification efficiency, ammonia slip rate, and the operational safety of downstream equipment. However, in existing technologies, ammonia injection grids are generally fixedly installed in the flue. The flue space is narrow and often enclosed. With the grid fixed in the middle or top of the flue, maintenance personnel have difficulty entering to inspect for nozzle blockage, wear, or structural deformation. Often, it is necessary to cut and remove parts of the flue or catalyst modules, which is time-consuming and poses certain safety risks.

[0003] Therefore, how to reduce the maintenance time of the ammonia injection grid in the denitrification unit is a technical problem that urgently needs to be solved by those skilled in the art.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0005] This disclosure provides at least one denitrification device and its ammonia injection grid assembly.

[0006] In a first aspect, embodiments of this disclosure provide a denitrification device, comprising:

[0007] An ammonia injection grid pipeline includes a main pipe and at least one branch pipe, wherein the branch pipe is connected to the main pipe and the main pipe is connected to an ammonia gas transmission pipeline.

[0008] The mounting frame has a number of mounting positions matching the number of branch pipes, and the branch pipes are assembled into the mounting positions via a detachable structure.

[0009] The flue has several threaded holes on its side wall;

[0010] The mounting frame is connected to the flue via a flange. The flange is fastened to the threaded holes of the flue via bolts and nuts. The mounting frame is detachably connected to the flue via the fastening assembly.

[0011] In one alternative embodiment, the detachable structure includes a flange plate and a frame flange that mates with the flange plate;

[0012] The flange plate and the branch pipe are connected to form a whole. The frame flange is set at the entrance of the installation position. The branch pipe is detachably assembled in the installation position through the cooperation of the frame flange and the flange plate.

[0013] In one optional embodiment, a support member is provided at the end of the mounting position, and the support member is provided with a groove that matches the shape of the branch pipe.

[0014] In one alternative implementation, the main pipe is connected to the ammonia delivery pipeline via a flange.

[0015] Secondly, embodiments of this disclosure also provide an ammonia injection grid assembly, which is assembled in the flue of a denitrification device, comprising:

[0016] An ammonia injection grid pipeline includes a main pipe and at least one branch pipe, wherein the branch pipe is connected to the main pipe and the main pipe is connected to an ammonia gas transmission pipeline.

[0017] The mounting frame has a number of mounting positions matching the number of branch pipes, and the branch pipes are assembled into the mounting positions via a detachable structure.

[0018] The mounting frame is detachably connected to the flue via fastening components.

[0019] In one optional embodiment, a plurality of threaded holes are provided on the side wall of the flue;

[0020] The fastening assembly includes a flange, bolts, and nuts. The flange is mounted on a mounting frame, which is detachably connected to the flue via bolts, nuts, and threaded holes.

[0021] In one alternative embodiment, the detachable structure includes a flange plate and a frame flange that mates with the flange plate;

[0022] The flange plate and the branch pipe are connected to form a whole. The frame flange is set at the entrance of the installation position. The branch pipe is detachably assembled in the installation position through the cooperation of the frame flange and the flange plate.

[0023] In one optional embodiment, a support member is provided at the end of the mounting position, and the support member is provided with a groove that matches the shape of the branch pipe.

[0024] In one alternative implementation, the main pipe is connected to the ammonia delivery pipeline via a flange.

[0025] The beneficial effects of this utility model are that, by setting an installation frame in the flue, the ammonia injection grid pipe is assembled in the installation frame. The installation frame is detachably assembled in the flue via flanges. If the entire ammonia injection grid pipe needs to be inspected, the installation frame can be directly disassembled from the flue for inspection. In addition, the branch pipes of the ammonia injection grid are detachably assembled in the installation frame. If the branch pipes of the ammonia injection grid need to be inspected separately, the branch pipes of the ammonia injection grid can be disassembled separately for inspection. The entire inspection process does not require cutting or removing parts of the flue or catalyst module, which is simple to operate and saves inspection time.

[0026] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and drawings.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 A structural diagram of a denitrification device and its ammonia injection grid assembly provided in this disclosure embodiment;

[0030] Figure 2 A schematic diagram of the assembly of an ammonia injection grid and a mounting frame for a denitrification device provided in an embodiment of this disclosure;

[0031] Figure 3 A front view of a denitrification device mounting frame provided in an embodiment of this disclosure;

[0032] Figure 4 This is a top view of an ammonia injection grid and mounting frame of a denitrification device provided in an embodiment of this disclosure.

[0033] In the picture:

[0034] 100. Ammonia injection grid pipe; 110. Main pipe; 120. Branch pipe; 200. Ammonia gas transmission pipe; 300. Mounting frame; 310. Mounting position; 320. Support component; 321. Groove; 400. Fastening assembly; 410. Flange; 420. Bolt; 430. Nut; 500. Flue; 600. Demountable structure; 610. Flange plate; 620. Frame flange. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0037] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0038] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0039] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0040] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0041] Research has revealed the following drawbacks of existing technologies: In existing technologies, ammonia injection grilles are generally fixedly installed in flues. The flue space is narrow and mostly has a closed structure. The ammonia injection grilles are fixed in the middle or top of the flue, making it difficult for maintenance personnel to enter the interior to check for nozzle blockage, wear, or structural deformation. Often, it is necessary to cut and remove part of the flue or catalyst module, which is time-consuming and poses certain safety risks.

[0042] Based on the above research, this disclosure provides a denitrification device and its ammonia injection grid assembly, which solves the above problems by detachably assembling the ammonia injection grid pipe to the mounting frame, and the mounting frame being detachably assembled in the flue.

[0043] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0046] See Figure 1 This disclosure provides a denitrification device, including: a flue 500, in which an installation frame 300 is provided, flanges 410 are provided on both sides of the installation frame 300, and a plurality of threaded holes are provided on the side wall of the flue 500. The flanges 410 are fastened to the threaded holes of the flue 500 by bolts 420 and nuts 430, and the installation frame 300 is detachably connected to the flue 500 by the fastening assembly 400.

[0047] See also Figure 1 An ammonia injection grid pipe 100 is installed within the mounting frame 300. The ammonia injection grid pipe 100 includes a main pipe 110 and at least one branch pipe 120. The branch pipe 120 is connected to the main pipe 110, and the main pipe 110 is connected to the ammonia gas conveying pipe 200. The mounting frame 300 has a number of mounting positions 310 matching the number of branch pipes 120. The branch pipes 120 are mounted in the mounting positions 310 via a detachable structure 600. With this configuration, when maintenance of the entire ammonia injection grid pipe 100 is required, the mounting frame 300 can be directly disassembled from the flue 500, thus enabling maintenance of the entire ammonia injection grid pipe 100. Furthermore, since the branch pipes 120 of the ammonia injection grid are detachably mounted within the mounting frame 300, if individual maintenance of the branch pipes 120 is required, they can be disassembled and maintained separately. The entire maintenance process does not require cutting or removing any part of the flue 500 or the catalyst module, simplifying the operation and saving maintenance time.

[0048] See also Figure 1 and Figure 2 In some embodiments, the detachable structure 600 includes a flange plate 610 and a frame flange 620 that mates with the flange plate 610. The flange plate 610 is welded to the branch pipe 120, making the branch pipe 120 and the flange plate 610 an integral unit. The frame flange 620 is located at the inlet of the mounting position 310. The frame flange 620 and the flange plate 610 can be connected by bolts 420, but are not limited to this connection. The branch pipe 120 is detachably assembled within the mounting position 310 through the mate between the frame flange 620 and the flange plate 610. If separate maintenance is required on the branch pipe 120 of the ammonia injection grid, simply unscrew the bolts 420 on the frame flange 620 to remove the ammonia injection grid branch pipe 120 from the mounting frame for maintenance.

[0049] See Figure 3 and Figure 4In some embodiments, a support member 320 is provided at the end of the mounting position 310. The support member 320 is provided with a groove 321 that matches the shape of the branch pipe 120. It is suitable for supporting the tail of the branch pipe 120 and also serves as a positioning function, which facilitates the disassembly and installation of the branch pipe 120.

[0050] See Figure 1 In some embodiments, the main pipe 110 is connected to the ammonia delivery pipe 200 via a flange. When the ammonia injection grid pipe 100 needs maintenance, it can be easily removed from the flue 500 by simply removing the connecting bolts 420 of the flange on the ammonia delivery pipe 200 and the flue 500.

[0051] See also Figure 1 Some embodiments also provide an ammonia injection grid assembly, which is assembled in the flue 500 of a denitrification device, including: an ammonia injection grid pipe 100, including a main pipe 110 and at least one branch pipe 120, the branch pipe 120 being connected to the main pipe 110, and the main pipe 110 being connected to an ammonia gas conveying pipe 200; an installation frame 300, which is provided with a number of installation positions 310 matching the number of branch pipes 120, the branch pipes 120 being assembled in the installation positions 310 via a detachable structure 600; wherein, the installation frame 300 is detachably connected to the flue 500 via a fastening assembly 400.

[0052] See also Figure 1 In some embodiments, the sidewall of the flue 500 is provided with a plurality of threaded holes; the fastening assembly 400 includes a flange 410, a bolt 420 and a nut 430, the flange 410 is assembled on the mounting frame 300, and the mounting frame 300 is detachably connected to the flue 500 through the cooperation of the bolt 420, the nut 430 and the threaded holes.

[0053] In summary, this denitrification device uses an installation frame 300 installed in the flue 500 to assemble the ammonia injection grid pipe 100 within the installation frame 300. The installation frame 300 is detachably installed in the flue 500 via flanges. If maintenance of the entire ammonia injection grid pipe 100 is required, the installation frame 300 can be directly removed from the flue 500 for maintenance. In addition, the branch pipe 120 of the ammonia injection grid is detachably installed in the installation frame 300. If individual maintenance of the branch pipe 120 of the ammonia injection grid is required, the branch pipe 120 of the ammonia injection grid can be disassembled and maintained separately. The entire maintenance process does not require cutting or removing any part of the flue 500 or the catalyst module, making the operation simple and saving maintenance time.

[0054] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0055] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0056] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0057] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0058] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A denitration device characterized by comprising: include: The ammonia injection grid pipe (100) includes a main pipe (110) and at least one branch pipe (120), the branch pipe (120) being connected to the main pipe (110), and the main pipe (110) being connected to the ammonia delivery pipe (200); The mounting frame (300) is provided with a number of mounting positions (310) matching the number of the branch pipes (120), and the branch pipes (120) are fixed in the mounting positions (310) by a detachable structure (600); The flue (500) has several threaded holes on its side wall; The mounting frame (300) is connected to the flue (500) via a flange (410). The flange (410) is fitted with the threaded holes of the flue (500) via bolts (420) and nuts (430) to form a fastening assembly (400). The mounting frame (300) is detachably connected to the flue (500) via the fastening assembly (400).

2. The denitrification device as described in claim 1, characterized in that, The detachable structure (600) includes a flange plate (610) and a frame flange (620) that mates with the flange plate (610). The flange plate (610) and the branch pipe (120) are connected to form a whole. The frame flange (620) is set at the entrance of the installation position (310). The branch pipe (120) is detachably assembled in the installation position (310) through the frame flange (620).

3. The denitrification device as described in claim 1, characterized in that, The end of the mounting position (310) is provided with a support member (320), and the support member (320) is provided with a groove (321) that matches the shape of the branch pipe (120).

4. The denitrification device as described in claim 1, characterized in that, The main pipe (110) is connected to the ammonia delivery pipe (200) via a flange.

5. An ammonia injection grid assembly characterized by, It is installed in the flue (500) of the denitrification unit, including: The ammonia injection grid pipe (100) includes a main pipe (110) and at least one branch pipe (120), the branch pipe (120) being connected to the main pipe (110), and the main pipe (110) being connected to the ammonia delivery pipe (200); The mounting frame (300) is provided with a number of mounting positions (310) matching the number of the branch pipes (120), the branch pipes (120) being assembled in the mounting positions (310) by means of a detachable structure (600); The mounting frame (300) is detachably connected to the flue (500) via a fastening assembly (400).

6. The ammonia injection grid assembly as described in claim 5, characterized in that, The flue (500) has several threaded holes on its side wall; The fastening assembly (400) includes a flange (410), bolts (420) and nuts (430). The flange (410) is mounted on a mounting frame (300), which is detachably connected to the flue (500) by means of bolts (420), nuts (430) and threaded holes.

7. The ammonia injection grid assembly as described in claim 5, characterized in that, The detachable structure (600) includes a flange plate (610) and a frame flange (620) that mates with the flange plate (610). The flange plate (610) and the branch pipe (120) are connected to form a whole. The frame flange (620) is set at the entrance of the installation position (310). The branch pipe (120) is detachably assembled in the installation position (310) through the frame flange (620).

8. The ammonia injection grid assembly as described in claim 5, characterized in that, The end of the mounting position (310) is provided with a support member (320), and the support member (320) is provided with a groove (321) that matches the shape of the branch pipe (120).

9. The ammonia injection grid assembly as described in claim 5, characterized in that, The main pipe (110) is connected to the ammonia delivery pipe (200) via a flange.

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