Mixing and guiding device of variable-diameter section flue and method of mixing and guiding device

Abstract

The invention discloses a mixing and guiding device of a variable-diameter section flue and a method thereof. The mixing and guiding device comprises a flue unit and a guiding unit connected with the flue unit. The variable-diameter section flue has the beneficial effects that by arranging the partition plates between the partitions, airflow can stably flow according to a preset streamline when entering all the partitions, the length and the angle of the partition plates between the partitions are accurately adjusted according to the geometrical shape of the flue, and it is ensured that the airflow is evenly distributed in the whole variable-diameter section flue; the uniformity of a velocity field is greatly improved, the local airflow turbulence phenomenon caused by the non-uniform velocity field is avoided, the airflow mixing effect is further enhanced through the arrangement of the mixer, and the concentration field is also effectively controlled through the simultaneous cooperation of the partition plates in the partitions; therefore, pollutants in the flue gas can be uniformly treated in the denitration process, and the overall efficiency of a denitration system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas flow guiding, in particular to a mixing and guiding device for a flue with a variable diameter cross section and a method thereof. Background Art

[0002] With increasingly stringent environmental protection requirements, coal-fired power plants must undergo strict denitrification treatment before emitting flue gas. However, in the flue, due to problems such as uneven distribution of flue gas velocity and local airflow turbulence, the denitrification efficiency is often reduced, increasing energy consumption and operating costs. Existing flue guide devices are usually difficult to adapt to the complex flow field of variable-diameter flues, and airflow is prone to turbulence, backflow and other undesirable phenomena when passing through variable-diameter flues.

[0003] The denitrification system of coal-fired units has high requirements for flow field uniformity. The large deviation in airflow distribution leads to poor uniformity of the denitrification ammonia injection system and reactor velocity, affecting the denitrification efficiency and nitrogen oxide emission indicators of coal-fired units. Therefore, the relative standard deviation of the velocity distribution entering the denitrification system reactor is required to be less than 15%. Only when the inlet flue flow field of the denitrification system is as uniform as possible can the velocity distribution of the denitrification system reactor meet the index requirements. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a mixing and guide device and method for a variable-diameter cross-section flue, which can ensure the uniformity requirement of the velocity field while producing an effective mixing effect and ensuring the uniformity of the concentration field.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a mixing and flow guiding device for a flue with a variable cross-section, comprising a flue unit and a flow guiding unit connected to the flue unit;

[0008] The flue unit comprises a flue wall, a flue inlet section arranged at one end of the flue wall, and a flue outlet section arranged at one end of the flue wall away from the flue inlet section;

[0009] The guide unit includes several groups of partitions to evenly divide the flue wall in the horizontal direction, several groups of mixers for mixing the airflow in the flue, partition plates in the partitions for evenly distributing the airflow at the flue entrance, and partition partition plates for assisting gas guidance.

[0010] As a preferred solution of the mixing and guiding device of the variable-diameter cross-section flue of the present invention, the flue inlet cross-section and the flue outlet cross-section are evenly divided by partitions, the number of partitions is equal to the value of the flue length / flue width, and the width and length of each flue cross-section in the partition are as similar as possible.

[0011] As a preferred solution of the mixing and guiding device of the variable-diameter cross-section flue of the present invention, the mixing inlet of the mixer is arranged in a partition in the direction of the flue inlet cross-section, and the number of mixers is set according to the mixing effect and resistance requirements.

[0012] As a preferred solution of the mixing and guiding device of the variable-diameter cross-section flue of the present invention, wherein: the partition is connected along the midpoint of the flue inlet cross-section where the partition is located to the midpoint of the flue outlet cross-section to form a virtual center line within the partition, the partition is located at the same side angle of the flue inlet cross-section and the flue outlet cross-section as the virtual line between the partitions, and a mixer arrangement axis is set along the partition close to the flue inlet cross-section and the virtual center line within the partition, the angle formed by the mixer and the mixer arrangement axis within the partition is 30° to 60°, and the mixer is evenly arranged along the mixer arrangement axis within the partition to ensure good mixing effect and uniform flow velocity distribution.

[0013] As a preferred solution of the mixing and guiding device of the variable-diameter cross-section flue of the present invention, the number of partitions in the partition is determined according to the angle between the flue wall and the horizontal. When the angle exceeds 45°, 3 to 5 groups of partitions are set; when the angle is less than 45°, 2 to 3 groups of partitions are set. The length of the partition in the partition extends from the flue inlet cross-section to the mixer inlet cross-section. The mixer inlet cross-section is parallel to the mixer arrangement axis and is located on one side of the mixer mixing inlet.

[0014] As a preferred solution of the mixing and guiding device of the variable cross-section flue of the present invention, the length of the partitioning partition is determined according to the airflow streamline and can be extended beyond the mixer outlet section to further optimize the uniformity of the airflow.

[0015] As a preferred solution of the mixing and guiding device of the variable-diameter cross-section flue of the present invention, the partitions within the partitions are parallel to the virtual center lines within the partitions, and the partition partitions are arranged along the virtual lines between the partitions to ensure the reasonable guidance of the airflow within and between the partitions.

[0016] To solve the above technical problems, the present invention provides the following technical solutions: a method for arranging a mixing and flow guiding device of a flue with a variable cross-section, which includes determining the number of partitions and the arrangement axis of the mixers in the partitions according to the sizes of the flue inlet and outlet;

[0017] Determine the number of partitions and auxiliary lines within the partitions;

[0018] Arrange partition panels and partition inner partitions;

[0019] Arrange mixers;

[0020] Adjust the length of the partition spacers.

[0021] As a preferred scheme of the layout method of the present invention, determining the number of partitions and auxiliary lines within the partitions includes determining the number of partitions according to the sizes of the flue inlet and outlet, dividing the flue inlet and outlet into equal number of partitions according to their lengths, connecting the midpoints of the flue inlet and outlet in the partition to form a virtual center line within the partition, and setting a mixer layout axis perpendicular to the virtual center line within the partition at the flue inlet.

[0022] As a preferred scheme of the layout method of the present invention, wherein: arranging the mixer includes arranging the mixer along the mixer layout axis, the mixer is arranged by a rotation angle adjustment method to ensure that the mixer mixing inlet can effectively guide the airflow into the partition, and the layout angle of the partition partition plate and the virtual line between the partitions is optimized and adjusted according to the geometric shape of the variable diameter flue to minimize the flow velocity deviation and ensure that the airflow entering the denitrification system has a high uniformity.

[0023] Beneficial effects of the present invention: The present invention arranges partition partitions so that the airflow can flow smoothly according to the predetermined streamline when entering each partition. The length and angle of the partition partitions are precisely adjusted according to the geometric shape of the flue, ensuring the uniform distribution of the airflow in the entire variable-diameter cross-section flue, greatly improving the uniformity of the velocity field, avoiding local airflow turbulence caused by uneven velocity field, and further enhancing the mixing effect of the airflow through the arrangement of the mixer. The concentration field is also effectively controlled through the cooperation of the partitions in the partitions, thereby ensuring that the pollutants in the flue gas can be evenly treated during the denitrification process, thereby improving the overall efficiency of the denitrification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0025] Figure 1 It is a schematic diagram of the overall layout of the mixing and guide device of the variable-diameter cross-section flue.

[0026] Figure 2 This is the empty flue flow velocity distribution cloud diagram of the mixing and guide device of the variable-diameter cross-section flue.

[0027] Figure 3The flow velocity distribution cloud diagram of the mixer for the conventional setting of the mixing and guide device of the variable-diameter cross-section flue.

[0028] Figure 4 This is the velocity distribution cloud diagram of the mixer only, which is the mixing and flow-guiding device of the variable-diameter flue.

[0029] Figure 5 The velocity distribution cloud diagram of the partition inside the mixer of the mixing and guide device of the variable-diameter cross-section flue.

[0030] Figure 6 The mixer of the mixing and guide device of the variable-diameter flue is equipped with partition plates and the velocity distribution cloud diagram of the partition plates within the partitions.

[0031] Figure 7 This is the velocity distribution cloud diagram of the final layout of the mixing and guide device of the variable-diameter cross-section flue.

[0032] Figure 8 The figure is a schematic diagram of the overall flow of the arrangement method. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0036] Example 1

[0037] Reference Figures 1 to 7 , which is the first embodiment of the present invention, provides a mixing and guide device for a variable-diameter cross-section flue, which includes a flue unit 100 and a guide unit 200, which can ensure the uniformity requirement of the velocity field while producing an effective mixing effect to ensure the uniformity of the concentration field.

[0038] Specifically, a flue unit 100, and a guide unit 200 connected to the flue unit 100;

[0039] The flue unit 100 includes a flue wall 101, a flue inlet section 102 disposed at one end of the flue wall, and a flue outlet section 103 disposed at one end of the flue wall 101 away from the flue inlet section 102;

[0040] The flow guiding unit 200 includes a plurality of partitions 201 for uniformly dividing the flue wall 101 in the transverse direction, a plurality of mixers 202 for mixing the airflow in the flue, partition plates 203 for uniformly distributing the airflow at the flue entrance, and partition plates 204 for assisting the mixers 202 in gas flow guiding;

[0041] The flue inlet cross section 102 and the flue outlet cross section 103 are respectively divided into a plurality of groups of partitions 201 by connecting a plurality of groups of equally divided points.

[0042] Furthermore, the partition 201 evenly divides the flue inlet cross section 102 and the flue outlet cross section 103, the number of the partitions 201 is equal to the value of the flue length / flue width (rounded off), and the width and length of each flue cross section in the partition 201 are as similar as possible.

[0043] Furthermore, the mixing inlet of the mixer 202 is arranged in the partition 201 in the direction of the flue inlet section 102, and the number of the mixers 202 is set according to the mixing effect and resistance requirements.

[0044] Furthermore, the partition 201 is connected along the midpoint of the flue inlet section 102 where it is located to the midpoint of the flue outlet section 103 to form a virtual center line 201a within the partition, and the angle on the same side of the flue inlet section 102 and the flue outlet section 103 of the partition 201 is connected as a virtual line 201b between the partitions, and a mixer arrangement axis 201c is set along the partition 201 close to the flue inlet section 102 and the virtual center line 201a within the partition, and the angle formed by the mixer 202 and the mixer arrangement axis 201c in the partition 201 is 30° to 60°, and the mixer 202 is evenly arranged along the mixer arrangement axis 201c in the partition 201 to ensure a good mixing effect and uniform flow velocity distribution.

[0045] Furthermore, the number of partitions 203 within the partition is determined according to the angle between the flue wall and the horizontal. When the angle exceeds 45°, 3 to 5 groups of partitions are set; when the angle is less than 45°, 2 to 3 groups of partitions are set. The length of the partition 203 extends from the flue inlet section 102 to the mixer inlet section 203a. The mixer inlet section 203a is parallel to the mixer arrangement axis 201c and is located on the mixing inlet side of the mixer 202.

[0046] Furthermore, the length of the partitioning spacer 204 is determined according to the airflow streamline, and can be extended beyond the outlet cross section of the mixer 202 to further optimize the uniformity of the airflow.

[0047] Furthermore, the partition plate 203 within the partition is parallel to the virtual center line 201a within the partition, and the partition partition plate 204 is arranged along the virtual line 201b between the partitions to ensure the reasonable diversion of the airflow within the partition 201 and between the partitions 201.

[0048] Preferably, when setting the partitions 201, the flue inlet cross-section 102 and the flue outlet cross-section 103 are evenly divided at the same time to ensure that the length of the flue inlet cross-section 102 of each group of partitions 201 is the same, and the flue outlet cross-section 103 is also the same, and the corners on the same side of the flue inlet cross-section 102 and the flue outlet cross-section 103 in the partition 201 are connected as the virtual line 201b between the partitions, and the partition partitions 204 are arranged along the virtual line 201b between the partitions. At this time, since the flue wall 101 has a height difference and is an inclined surface, the setting angle of each group of partition partitions 204 will gradually change along the inclination direction of the flue wall 101, and a number of groups of mixers 202 are arranged in each group of partitions 201 according to the longitudinal width of the flue inlet cross-section 102.

[0049] When in use, when the airflow enters the flue entrance, it passes through the partition inner baffle 203, which is set according to the angle between the flue wall and the horizontal plane. The partition inner baffle 203 evenly distributes the airflow to each partition 201 and evenly distributes it to each group of mixers 202 in each partition 201, thereby avoiding the concentration or dispersion of the airflow when it just enters the flue. Through the guiding effect of the baffle, the airflow can enter each partition 201 at a nearly identical speed and direction. The presence of the partition inner baffle 203 effectively reduces the turbulence of the airflow, especially in the initial stage of the airflow entering the flue. The baffle changes the streamline of the airflow, so that it forms a stable flow in the partition 201, reduces local pressure fluctuations, and thus avoids uneven airflow caused by turbulence.

[0050] Subsequently, after the airflow is initially homogenized, it will enter each partition 201 of the flue and come into contact with the mixer 202. The mixer 202 arranged in each partition 201 further homogenizes the airflow. The design and arrangement of the mixer 202 ensure that the airflow can be fully mixed in the partition 201. Through the rotation and arrangement angle adjustment of the mixer 202, the airflow can be evenly distributed on the cross section, avoiding the flow velocity difference caused by local excessive speed or slowness. Inside the partition 201, the airflow passes through the multiple mixing effects of the mixer 202, and the velocity field and concentration field are significantly homogenized. This not only helps to form a stable flow field in the partition 201, but also allows the airflow to maintain the uniformity of the flow field after entering the flue entrance to cooperate with the partition partition 204 later.

[0051] Finally, after the airflow is homogenized in the partition 201, it will enter the transition area between the partitions 201. At this stage, the length and angle of the partition partition 204 are precisely adjusted to ensure that the airflow will not produce obvious speed fluctuations during the transition between the partitions 201. The partition partition 204 guides the airflow to flow along the set streamline, reducing the turbulence caused by the pressure difference between the partitions 201, thereby further ensuring the uniformity of the airflow and maintaining the uniformity of the gas at the flue outlet section 103 to the greatest extent, effectively improving the overall efficiency of the denitrification system.

[0052] In summary, the present invention sets partition partitions 204 so that the airflow can flow smoothly along the predetermined streamline when entering each partition 201. The length and angle of the partition partitions 204 are precisely adjusted according to the geometric shape of the flue, ensuring the uniform distribution of the airflow in the entire variable-diameter cross-section flue, greatly improving the uniformity of the velocity field, avoiding local airflow turbulence caused by uneven velocity field, and further enhancing the mixing effect of the airflow through the arrangement of the mixer 202. The concentration field is also effectively controlled through the cooperation of the partitions 203 in the partitions, thereby ensuring that the pollutants in the flue gas can be evenly treated during the denitrification process, thereby improving the overall efficiency of the denitrification system.

[0053] Example 2

[0054] Reference Figures 1 to 8 , which is the second embodiment of the present invention, and this embodiment provides a layout method, which includes a layout method, which enables the staff to understand the layout and installation method of the mixing and guide device of the variable-diameter cross-section flue.

[0055] Specifically, according to the size of the flue inlet and outlet, the number of the partitions 201 is determined, and the virtual center line 201a within the partition, the mixer arrangement axis 201c, and the virtual line 201b between the partitions are determined in the partition 201;

[0056] The partition plate 204 is arranged at the flue entrance, and the partition plates 203 in the partition are evenly distributed along the virtual center line 201a in the partition;

[0057] Arrange the mixer 202 on the mixer arrangement axis 201c in the partition 201 according to a predetermined angle and position;

[0058] The length of the partitioning spacer 204 is adjusted to extend beyond the outlet cross section of the mixer 202 to ensure uniform velocity distribution of the airflow at the outlet of the variable-diameter flue.

[0059] Furthermore, determining the number of partitions 201 and auxiliary lines within the partition 201 includes determining the number of partitions 201 according to the sizes of the flue inlet and outlet, dividing the flue inlet and outlet into equal numbers of partitions 201 according to their lengths, connecting the midpoints of the flue inlet and outlet in the partition 201 to form a virtual center line 201a within the partition, and setting a mixer arrangement axis 201c at the flue inlet that is perpendicular to the virtual center line 201a within the partition.

[0060] Further, the mixer 202 is arranged along the mixer arrangement axis 201c, and the mixer 202 is arranged by a rotation angle adjustment method to ensure that the mixing inlet of the mixer 202 can effectively guide the airflow into the partition 201, and the arrangement angle of the partition partition plate 204 and the virtual line 201b between the partitions is optimized and adjusted according to the geometric shape of the variable diameter flue to minimize the flow rate deviation and ensure that the airflow entering the denitration system has a high uniformity;

[0061] When the angle between the mixer 202 and the mixer arrangement axis 201c is smaller, the resistance encountered by the mixer 202 is greater, but the mixing effect is better. When the angle between the mixing zone 202 and the mixer arrangement axis 201c is larger, the resistance encountered is smaller, but the mixing effect is worse. Specific adjustments can be made according to project requirements and actual conditions. The adjustment range is that the angle between the mixing zone 202 and the mixer arrangement axis 201c is between 30° and 60°.

[0062]

[0063]

[0064] Empty flue: When there is no guide device, the velocity distribution of the airflow in the flue is extremely uneven, and the difference between the maximum velocity and the minimum velocity is significant, resulting in a relative standard deviation of the velocity distribution of up to 57.1%.

[0065] Conventional mixer 202 arrangement scheme: The mixers 202 are evenly arranged at the flue inlet. Although the mixing effect is improved, the velocity distribution at the variable-diameter flue outlet cannot be effectively controlled, and the relative standard deviation of the velocity distribution is 42.1%.

[0066] Only the mixer 202: The solution that relies solely on the mixer 202 is not ideal, the uniformity of the velocity field is poor, and the standard deviation is further increased.

[0067] Mixer 202 is added with partitions and internal partitions 203: After adding the partitions and internal partitions 203, the air flow distribution is improved, and the relative standard deviation of the flow velocity distribution is reduced to 33.77%.

[0068] Mixer 202 plus partitioning plate 204 and partitioning inner partition 203: By combining the partitioning plate 204 and the partitioning inner partition 203, the uniformity of the airflow is further improved and easier to maintain to the flue outlet, and the standard deviation is reduced to 27.76%.

[0069] Final layout plan: Combining the partition inner partition baffles 203 and partition spacer 204 with the optimal angle and length, and the optimized layout of the mixer 202, the uniformity of the flow velocity distribution of the airflow in the flue is optimized, and the standard deviation is reduced to 21.2%.

[0070] In summary, the layout method makes it easier for staff to become familiar with the operating steps of the device, facilitates installation and layout, improves work efficiency, and makes it easier for staff to quickly master the usage methods and operating procedures. The optimization points and actual effects are reflected through cloud maps.

[0071] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0072] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0073] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0074] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A mixing and flow guiding device for a flue with a variable cross-section, characterized in that: include, A flue unit (100), and a flow guide unit (200) connected to the flue unit (100); The flue unit (100) comprises a flue wall surface (101), a flue inlet section (102) arranged at one end of the flue wall surface, and a flue outlet section (103) arranged at one end of the flue wall surface (101) away from the flue inlet section (102); The guide unit (200) comprises a plurality of partition groups (201) for evenly dividing the flue wall (101) in the transverse direction, a plurality of mixer groups (202) for mixing the airflow in the flue, partition plates (203) for evenly distributing the airflow at the flue entrance, and partition spacers (204) for assisting gas guide.

2. The mixing and flow guiding device for a flue with a variable cross-section as claimed in claim 1, characterized in that: The partitions (201) evenly divide the flue inlet cross-section (102) and the flue outlet cross-section (103), the number of the partitions (201) is equal to the value of the flue length / flue width rounded off, and the width and length of each flue cross-section of the partition (201) are as similar as possible.

3. The mixing and flow guiding device for a flue with a variable cross-section as claimed in claim 2, characterized in that: The mixing inlet of the mixer (202) is arranged in the partition (201) in the direction of the flue inlet section (102), and the number of the mixers (202) is set according to the mixing effect and resistance requirements.

4. The mixing and flow guiding device for a flue with a variable cross-section as claimed in claim 3, characterized in that: The partition (201) is connected along the midpoint of the flue inlet section (102) where it is located to the midpoint of the flue outlet section (103) to form a virtual center line (201a) within the partition, and the overlapping sections between two groups of the partitions (201) are connected at the equal points of the flue inlet section (102) and the equal points of the flue outlet section (103) as a virtual line (201b) between the partitions. The mixer arrangement axis (201c) is set along the partition (201) near the flue inlet section (102) and the virtual center line (201a) within the partition. The angle formed by the mixer (202) and the mixer arrangement axis (201c) in the partition (201) is 30° to 60°. The mixer (202) is evenly arranged along the mixer arrangement axis (201c) in the partition (201) to ensure a good mixing effect and uniform flow velocity distribution.

5. The mixing and flow guiding device for a flue with a variable cross-section as claimed in claim 4, characterized in that: The number of partition plates (203) is determined according to the angle between the flue wall and the horizontal. When the angle exceeds 45°, 3 to 5 groups are arranged; when the angle is less than 45°, 2 to 3 groups are arranged. The length of the partition plate (203) extends from the flue inlet section (102) to the mixer inlet section (203a). The mixer inlet section (203a) is parallel to the mixer arrangement axis (201c) and is located on one side of the mixing inlet of the mixer (202).

6. The mixing and flow guiding device for a flue with a variable cross-section as claimed in claim 5, characterized in that: The length of the partitioning spacer (204) is determined according to the air flow streamline, and can be extended beyond the outlet cross section of the mixer (202) to further optimize the uniformity of the air flow.

7. The mixing and flow-guiding device for a flue with a variable cross-section as claimed in claim 6, characterized in that: The partition plate (203) within the partition is parallel to the virtual center line (201a) within the partition, and the partition partition plate (204) is arranged along the virtual line (201b) between the partitions to ensure the reasonable diversion of the airflow within the partition (201) and between the partitions (201).

8. A layout method, characterized in that: The mixing and flow-guiding device for a flue of variable cross-section as claimed in any one of claims 1 to 7; and Determining the number of the partitions (201) and the auxiliary lines within the partitions (201); Arranging the partitioning spacer (204) and the partitioning inner spacer (203); Arranging the mixer (202); The length of the partition spacer (204) is adjusted.

9. The arrangement method according to claim 8, characterized in that: Determining the number of the partitions (201) and the auxiliary lines within the partitions (201) includes determining the number of the partitions (201) according to the sizes of the flue inlet and outlet, dividing the flue inlet and outlet into an equal number of partitions (201) according to their lengths, and connecting the midpoints of the flue inlet and outlet in the partition (201) to form a virtual center line (201a) within the partition.

10. The arrangement method according to claim 9, characterized in that: Arranging the mixer includes arranging the mixer (202) along the mixer arrangement axis (201c), and the arrangement of the mixer (202) adopts a rotation angle adjustment method to ensure that the mixing inlet of the mixer (202) can effectively guide the airflow into the partition (201), and the arrangement angle of the partition partition plate (204) and the virtual line (201b) between the partitions is optimized and adjusted according to the geometric shape of the variable diameter flue to minimize the flow velocity deviation and ensure that the airflow entering the denitrification system has a high uniformity.

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