Homogenized fly ash dry method reactor

Abstract

The utility model belongs to the technical field of waste incineration flue gas treatment, and relates to a homogenized fly ash dry-process reactor, which comprises a U-shaped baffling mixing flue which is arranged from bottom to top along the flowing direction of flue gas, at least one static mixer is arranged in a pipe section, in which the flue gas flows downwards, in the U-shaped baffling mixing flue, and the static mixer is connected with the U-shaped baffling mixing flue. The static mixer is a hollow shell penetrating in the vertical direction, and the inner diameter of the hollow shell is gradually reduced in the flue gas flowing direction, so that the inner diameter of an outlet of the hollow shell is smaller than the inner diameter of an inlet of the hollow shell; the outer diameter of the upper end of the static mixer is matched with the inner diameter of the position, correspondingly provided with the static mixer, in the U-shaped baffling mixing flue, so that the static mixer is connected with the inner wall of the U-shaped baffling mixing flue through the upper end of the static mixer. According to the utility model, the static mixer is arranged at the inlet section of the dry-process reactor, so that the internal flow field of the dry-process reactor is improved, the mixing degree of fly ash in the reactor is improved, the aim of homogenization is fulfilled, and meanwhile, the problem of ash deposition at the bottom of the reactor is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste incineration flue gas treatment, and relates to a homogeneous fly ash dry reactor. Background Technique

[0002] At present, waste incineration has become the mainstream waste disposal method, and the competition among waste incineration plants is extremely fierce. In addition to meeting strict environmental protection indicators, they also need to face huge operating pressures. In this context, the research and development of new technologies is of great significance for enhancing the core competitiveness of enterprises and creating new profit growth. In recent years, the dry desulfurization technology has been rapidly popularized in the foreign waste incineration industry, and the ultra-low emission of acidic gases has been successfully achieved. Its main technical core is the dry desulfurization reactor and the fly ash activation equipment. In order to keep up with the latest development trend of the industry, meet the desulfurization requirements in different scenarios, and break through the technical problems of "choking the neck" of core equipment, it is urgent to independently develop a new dry desulfurization technology. By developing a new dry desulfurization technology, it is not only possible to meet more stringent flue gas emission standards, but also to reduce the operation and investment costs of waste incineration plants and enhance the core competitiveness of enterprises; it has important practical significance and long-term development prospects for promoting the green and efficient development of the waste incineration industry.

[0003] For the dry desulfurization treatment technology of waste incineration flue gas, a dry reactor needs to be set up, and the desulfurization agent such as lime, fly ash or sodium bicarbonate is mixed with the flue gas inside the dry reactor to improve the desulfurization efficiency. Due to the sharp change of the flue gas flow field inside the dry reactor, there are problems such as ash accumulation at the bottom of the dry reactor and uneven mixing of fly ash and flue gas at the outlet. At present, the research on the problems existing in the dry reactor by those skilled in the art is relatively small, and there are few solutions. For example, the Chinese patent with the publication number CN212396369U discloses a dry mixer for waste incineration flue gas treatment. There is no device for improving the flue gas flow inside the dry mixer, and only an air cannon is set at the bottom to solve the problem by forced ash blowing; another example is the Chinese patent with the publication number CN212017381U, which discloses a dry desulfurization reaction device, and a mechanical guide cylinder is set at the bottom of the dry reactor for forced ash removal; another example is the Chinese patent with the publication number CN214809829U, which discloses an ash handling device, a semi-dry desulfurization reactor and a reaction system, and a screw conveyor is set at the bottom of the reactor, and a compressed air pipe is set on the side of the screw conveyor to remove ash by mechanical or pneumatic means.

[0004] It can be seen that the solutions in the prior art are usually passive treatment methods after ash accumulation occurs, and cannot effectively prevent the problem of ash accumulation at the bottom of the reactor. And the existing dry reactors add mechanical or pneumatic devices at the bottom to carry out forced ash cleaning. This method has high energy consumption, cannot completely solve the ash accumulation problem, and the fly ash at the reactor outlet is difficult to be fully mixed with the flue gas, which is not conducive to the continuous and stable operation of the dry reactor. Summary of the Invention

[0005] In view of this, the purpose of the present utility model is to provide a homogenized fly ash dry reactor, in which a static mixer is arranged at the inlet section of the dry reactor to improve the internal flow field of the dry reactor, increase the mixing degree of fly ash inside the reactor, achieve the purpose of homogenization, and at the same time solve the problem of ash accumulation at the bottom of the reactor.

[0006] To achieve the above purpose, the present utility model provides the following technical solutions:

[0007] A homogenized fly ash dry reactor includes a U-shaped baffle mixing flue arranged first downwards and then upwards along the flue gas flow direction. At least one static mixer is provided in the pipe section where the flue gas flows downwards in the U-shaped baffle mixing flue. The static mixer is a hollow shell that penetrates vertically, and the inner diameter of the hollow shell gradually decreases along the flue gas flow direction, so that its outlet inner diameter is smaller than the inlet inner diameter.

[0008] The outer diameter of the upper end of the static mixer matches the inner diameter of the U-shaped baffle mixing flue at the corresponding installation position of the static mixer, so as to be connected to the inner wall of the U-shaped baffle mixing flue through the upper end of the static mixer.

[0009] Further, the outlet end of the U-shaped baffle mixing flue has a section of arc-shaped pipe, and a C-shaped guiding orifice plate is arranged in the middle of the arc-shaped pipe along the flue gas flow direction, and the radian of the C-shaped guiding orifice plate matches the radian of the arc-shaped pipe.

[0010] Further, the C-shaped guiding orifice plate is a square flat plate with a number of through holes after being unfolded.

[0011] Further, the inner diameter of the through holes on the square flat plate is 20 mm, and two adjacent columns of through holes are taken as a group. The interval between the two columns of through holes is 40 mm, the interval between the through holes in the same column is 100 mm, and the through holes in the two columns are arranged staggeredly.

[0012] Further, the U-shaped baffle mixing flue includes a flue gas inlet pipe, a deformation transition pipe, a reduced-diameter pipe, and a square pipe connected in sequence along the flue gas flow direction;

[0013] The flue gas inlet pipe is a circular pipe structure, the deformation transition pipe is a circular-to-square structure to connect the flue gas inlet pipe and the reduced-diameter pipe with a square pipe structure. The side length of the reduced-diameter pipe in the length direction gradually shortens along the flue gas flow direction, so that the cross-sectional area of the reduced-diameter pipe gradually decreases from the inlet to the outlet;

[0014] The square pipe as a whole has a J-shaped bend structure. The cross-section of the square pipe matches the outlet cross-section of the reducer pipe. The flue gas inlet pipe, the deformation transition pipe, and the reducer pipe are all in the downward flowing pipe section of the baffle mixing flue. Part of the square pipe is in the downward flowing part of the baffle mixing flue, and the other part is in the upward flowing part of the baffle mixing flue. The U-shaped baffle structure of the baffle mixing flue from bottom to top is formed by the square pipe with a J-shaped bend structure as a whole.

[0015] Further, two static mixers are provided in the pipe section flowing downward in the U-shaped baffle mixing flue, namely a first static mixer and a second static mixer;

[0016] The first static mixer is arranged at the connection of the flue gas inlet pipe and the deformation transition pipe, and its outer shape is a hollow truncated cone with a larger upper part and a smaller lower part;

[0017] The second static mixer is arranged at the connection of the reducer pipe and the square pipe, and its outer shape is a hollow square convex platform with a larger upper part and a smaller lower part.

[0018] Further, the height of the static mixer is 200 - 500 mm.

[0019] The beneficial effects of the present utility model are as follows:

[0020] A homogenized fly ash dry reactor provided by the present utility model sets a static mixer in the inlet section of the dry reactor (i.e., the pipe section where the flue gas flows downward in the U-shaped baffle mixing flue) to improve the internal flow field of the dry reactor, increase the mixing degree of fly ash inside the reactor, achieve the purpose of homogenization, and at the same time solve the problem of ash accumulation at the bottom of the reactor.

[0021] And a C-shaped guide orifice plate matching the flow channel is arranged at the outlet of the dry reactor, which solves the problem of uneven mixing of fly ash and flue gas at the outlet of the dry reactor.

[0022] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the following specification. Description of the Drawings

[0023] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail preferably with reference to the accompanying drawings, where:

[0024] Figure 1 It is a schematic structural diagram of a homogenized fly ash dry reactor in the embodiment;

[0025] Figure 2 Schematic three-dimensional structure diagram of the first static mixer in the embodiment;

[0026] Figure 3 Top-view structure diagram of the second static mixer in the embodiment;

[0027] Figure 4 Schematic structure diagram of the C-shaped flow guiding orifice plate in the embodiment;

[0028] Figure 5 is Figure 4 Partial enlarged structure diagram at location A in

[0029] Reference numerals: first static mixer 1, second static mixer 2, C-shaped flow guiding orifice plate 3, flue gas inlet pipe 4, deformation transition pipe 5, reduced-diameter pipe 6, square pipe 7. Detailed implementation manners

[0030] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0031] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0032] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] Please refer to Figures 1 to 5, which is a homogeneous fly ash dry reactor, including a U-shaped baffle mixing flue from bottom to top. The U-shaped baffle mixing flue includes a flue gas inlet pipe 4, a deformation transition pipe 5, a variable diameter pipe 6, and a square pipe 7 connected in sequence along the flue gas flow direction;

[0034] The flue gas inlet pipe 4 is a circular pipe structure, and the deformation transition pipe 5 is a circular-to-square structure to connect the flue gas inlet pipe and the variable diameter pipe 6 with a square pipe structure. The side length of the variable diameter pipe 6 in the length direction gradually shortens along the flue gas flow direction, so that the cross-sectional area of the variable diameter pipe gradually decreases from the inlet to the outlet to connect the square pipe 7 with a smaller cross-sectional area;

[0035] The square pipe 7 is integrally in a J-shaped bend structure. The cross-section of the square pipe 7 matches the outlet cross-section of the variable diameter pipe 6. The flue gas inlet pipe 4, the deformation transition pipe 5, and the variable diameter pipe 6 are all in the downward flowing pipe section of the baffle mixing flue. A part of the square pipe 7 is in the downward flowing part of the baffle mixing flue, and the other part is in the upward flowing part of the baffle mixing flue. The U-shaped baffle structure from bottom to top of the baffle mixing flue is formed by the square pipe 7 integrally in a J-shaped bend structure; a deacidifying agent injection port and an activated carbon injection port are also provided on the flue gas inlet pipe.

[0036] The key of this embodiment is that at least 1 static mixer is provided in the downward flowing pipe section of the U-shaped baffle mixing flue. The static mixer is a hollow shell penetrating in the vertical direction, and the inner diameter of the hollow shell gradually decreases along the flue gas flow direction (from top to bottom), so that its outlet inner diameter is smaller than the inlet inner diameter; the outer diameter of the upper end of the static mixer matches the inner diameter of the U-shaped baffle mixing flue at the corresponding installation position of the static mixer, so as to be connected to the inner wall of the U-shaped baffle mixing flue through the upper end of the static mixer.

[0037] Preferably, the height of the static mixer is 200-500 mm.

[0038] A C-shaped guide orifice plate 3 is provided at the outlet of the square pipe 7. The C-shaped guide orifice plate 3 is arranged in the middle of the square pipe 7 along the flue gas flow direction, and its radian matches the radian at the outlet of the square pipe 7, and the radian is 80-90°. In this embodiment, it is preferably 85°; specifically, the two sides of the C-shaped guide orifice plate 3 are fixedly connected to the middle positions of the inner walls on both sides of the square pipe 7 to fix the C-shaped guide orifice plate in the middle of the outlet of the square pipe 7.

[0039] Preferably, in this embodiment, 2 static mixers are provided in the downward flowing pipe section of the U-shaped baffle mixing flue, namely the first static mixer 1 and the second static mixer 2;

[0040] Such as Figure 1 And Figure 2As shown, the first static mixer 1 is arranged at the connection of the flue gas inlet pipe 4 and the deformed transition pipe 5. Its outer shape is a hollow frustum with a larger upper part and a smaller lower part, and the inner diameter of the inlet is larger than that of the outlet.

[0041] As Figure 1 and Figure 3 shown, the second static mixer 2 is arranged at the connection of the variable-diameter pipe 6 and the square pipe 7. Its outer shape is a hollow square convex platform with a larger upper part and a smaller lower part, and the inner diameter of the inlet is larger than that of the outlet.

[0042] For key reference, Figure 4 and Figure 5 , the developed view of the C-shaped flow guiding orifice plate 3 is a square flat plate with a number of through holes. The inner diameter of the through holes on this square flat plate is 20 mm, and taking two adjacent columns of through holes as a group, the interval between the two columns of through holes is 40 mm, the interval between the through holes in the same column is 100 mm, and the through holes in the two columns are arranged staggeredly.

[0043] In another embodiment, the inner diameter of the through holes and the arrangement position of the through holes can also be adjusted adaptively according to actual needs.

[0044] Embodiment 2

[0045] The difference between this embodiment and Embodiment 1 is that the U-shaped baffle mixing flue can also be set to other structures, such as a full-section circular pipe or a full-section square pipe, or the cross-sectional area of the full-section pipeline is the same without variable diameter and deformation, or it can be changed from a square pipe to a circular pipe. The key of this application is that at least 1 static mixer is provided in the pipe section flowing downward in the U-shaped baffle mixing flue.

[0046] Preferably, the outlet end of the U-shaped baffle mixing flue has a section of arc-shaped pipeline, and a C-shaped flow guiding orifice plate 3 is arranged in the middle of this arc-shaped pipeline along the flue gas flow direction.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A homogenized fly ash dry reactor, comprising a U-shaped baffled mixing flue arranged in a downward and upward direction along the flue gas flow direction, characterized in that: At least one static mixer is provided in the pipe section where the smoke flows downward in the U-shaped baffled mixing flue, and the static mixer is a hollow shell that penetrates in the vertical direction, and the inner diameter of the hollow shell gradually decreases along the direction of smoke flow, so that the inner diameter of its outlet is smaller than the inner diameter of its inlet; The outer diameter of the upper end of the static mixer matches the inner diameter of the corresponding location of the static mixer in the U-shaped baffle mixing flue, so that the upper end of the static mixer is connected to the inner wall of the U-shaped baffle mixing flue.

2. The homogenized fly ash dry reactor according to claim 1, characterized in that: The outlet end of the U-shaped baffle mixing flue has a section of arc-shaped pipe, and a C-shaped guide hole plate is arranged in the middle of the arc-shaped pipe along the flue gas flow direction, and the curvature of the C-shaped guide hole plate matches the curvature of the arc-shaped pipe.

3. The homogenized fly ash dry reactor according to claim 2, characterized in that: The C-shaped guide hole plate is a square flat plate with a plurality of through holes after being unfolded.

4. The homogenized fly ash dry reactor according to claim 3, characterized in that: The inner diameter of the through holes on the square plate is 20 mm, and two adjacent rows of through holes form a group, the interval between the two rows of through holes is 40 mm, the interval between the through holes in the same row is 100 mm, and the through holes in the two rows are arranged in a staggered manner.

5. The homogenized fly ash dry reactor according to claim 1, characterized in that: The U-shaped baffled mixing flue comprises a flue gas inlet pipe, a deformation transition pipe, a diameter reducing pipe and a square pipe which are sequentially connected along the flue gas flow direction; The smoke inlet pipe is a round tube structure, and the deformation transition pipe is a round-to-square structure, so as to connect the smoke inlet pipe and the reducer pipe with a square tube structure, and the side length of the reducer pipe in the length direction is gradually shortened along the smoke flow direction, so that the cross-sectional area of ​​the reducer pipe is gradually reduced from the inlet to the outlet; The square tube has a J-shaped bend structure as a whole, and the cross-section of the square tube matches the outlet cross-section of the reducer. The flue gas inlet pipe, the deformation transition pipe and the reducer are all in the downward flowing section of the baffled mixing duct. A part of the square tube is in the downward flowing part of the baffled mixing duct, and the other part is the upward flowing part of the baffled mixing duct. The square tube with a J-shaped bend structure as a whole forms a U-shaped baffle structure of the baffled mixing duct that first goes down and then up.

6. The homogenized fly ash dry reactor according to claim 5, characterized in that: Two static mixers are provided in the downwardly flowing pipe section in the U-shaped baffled mixing flue, namely a first static mixer and a second static mixer; The first static mixer is arranged at the connection between the smoke inlet pipe and the deformation transition pipe, and its shape is a hollow frustum with a larger top and a smaller bottom; The second static mixer is arranged at the connection between the reducer and the square tube, and its appearance is a hollow square boss that is larger at the top and smaller at the bottom.

7. The homogenized fly ash dry reactor according to claim 1, characterized in that: The height of the static mixer is 200-500 mm.

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