Graded premixing self-adaptive cold and hot air mixing device

Abstract

The invention relates to the technical field of heat energy engineering and fluid mixing, and discloses a graded premixing self-adaptive cold and hot air mixing device which comprises a pipeline component, a hot air pipeline, a cold air pipeline and a mixing component, the mixing component comprises a hot air partition plate, and a hot air channel is installed on one side of the hot air partition plate. Hot air is uniformly distributed into a plurality of hot air channels, and a guide plate is further arranged in each channel so as to promote uniform distribution of the hot air in the height direction. The design can effectively promote uniform mixing of cold and hot air media, the design of the self-adaptive expansion deformation plate aims at solving the problem of stress deformation of the mixing device caused by temperature difference, the expansion plate and the flue bottom plate are connected at the two ends in a plug welding mode, gaps are reserved on the two sides, and the expansion plate and the flue bottom plate are allowed to freely deform along with temperature changes. Due to the design, the deformation of the flow guide piece caused by temperature difference can be absorbed under actual working conditions, so that the overall safety of the mixing device is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of clutch, and in particular to a graded premixed adaptive cold and hot air mixing device. Background Art

[0002] In coal-fired power generation units and other industrial applications, the mixing of hot and cold air media is a common and critical process. These processes usually involve uniformly mixing hot air from different sources with cold air to meet the temperature uniformity requirements of subsequent process equipment. However, in the prior art, there are some significant problems with the mixing of hot and cold air: 1. In most cases, the hot air duct is directly connected to the cold air duct without a special mixing device. This direct connection method leads to serious uneven mixing of hot and cold air, which affects the performance and efficiency of subsequent process equipment; 2. In order to solve the above-mentioned uneven mixing problem, some existing patent concepts propose the use of devices such as mixers or guide plates at the intersection of the two media. Although these devices can improve the mixing effect in theory, they have not been widely verified in practical applications. In addition, these static mixers often bring greater system resistance and increase energy consumption. More importantly, they fail to fully consider the stress deformation problem caused by the temperature difference between the hot and cold air media on the mixing device, which may cause the mixing device to break or even the air duct to rupture, threatening the safe operation of the system; 3. The cold air duct usually has a larger cross-sectional size, while the hot air duct is relatively small. When hot air enters the cold air duct, the temperature difference between the two will cause thermal expansion and contraction effects inside the duct and the mixing device. The stress deformation under the action of this temperature difference may cause structural damage to the mixing device, which in turn may lead to safety hazards; 4. Since the deformation of the guide caused by the temperature difference is not taken into account, the mixing device in the prior art may have serious safety risks in actual use. For example, the breakage of the mixing device may cause the flue to tear, causing the medium to leak, which not only affects production efficiency, but may also cause safety accidents. Summary of the invention

[0003] In view of the problems existing in the above-mentioned existing graded premixed adaptive cold and hot air mixing device, the present invention is proposed.

[0004] Therefore, the purpose of the present invention is to provide a hierarchical premixing adaptive cold and hot air mixing device, which can realize advance distribution, multi-stage premixing structure, and effectively promote the uniform mixing of cold and hot air media; no static mixer is required, and the system resistance is low; the deformation of the guide caused by the temperature difference is absorbed by the deformation of the expansion plate. The safety of equipment such as the mixer is guaranteed during actual use, and safety accidents caused by smoke duct tearing and medium leakage caused by deformation are avoided.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a graded premixed adaptive hot and cold air mixing device includes a pipeline component, including a hot air duct and a cold air duct, a mixing component, including a hot air dividing plate located on one side of the hot air duct, and a hot air channel is installed on one side of the hot air dividing plate.

[0006] As a preferred solution of the graded premixed adaptive hot and cold air mixing device described in the present invention, one side of the hot air duct is an inlet, and the hot air enters the duct from the inlet; one side of the hot air duct is an outlet, and the hot air flows from the outlet to the subsequent duct.

[0007] As a preferred solution of the graded premixed adaptive hot and cold air mixing device of the present invention, wherein: the hot air channel is fixedly connected to the outlet of the hot air duct, and the hot air channel is provided with a plurality of.

[0008] As a preferred solution of the graded premixed adaptive hot and cold air mixing device described in the present invention, the two side plates of the hot air channel are trapezoidal, the oblique side of the hot air channel is in the same direction as the flow direction of the cold air, and each hot air channel is fixedly connected with a plurality of arc-shaped guide plates along the trapezoidal inclined surface.

[0009] As a preferred solution of the graded premixed adaptive hot and cold air mixing device of the present invention, each of the arc guide plates is arranged in parallel, and each of the arc guide plates is arranged at equal intervals along the trapezoidal slope of the hot air channel.

[0010] As a preferred solution of the graded premixed adaptive hot and cold air mixing device described in the present invention, the hot air dividing plate is arched as a whole, a plurality of hot air dividing plates are provided, and the hot air dividing plates are fixedly connected to the hot air channel close to the hot air duct.

[0011] As a preferred solution of the graded premixed adaptive hot and cold air mixing device of the present invention, the two ends of each hot air dividing plate are fixedly connected to the adjacent ends of the hot air channel.

[0012] As a preferred solution of the graded premixed adaptive hot and cold air mixing device of the present invention, the outer wall of the hot air channel is fixedly connected with the cold air duct, and the diameter of the cold air duct is larger than the sum of the diameters of all the hot air channels.

[0013] As a preferred solution of the graded premixed adaptive cold and hot air mixing device described in the present invention, the cold air duct is arranged vertically to the hot air duct, and the cold air of the cold air duct flows from the opposite side of the trapezoidal hypotenuse of the hot air channel to the trapezoidal hypotenuse of the hot air channel.

[0014] As a preferred solution of the graded premixed adaptive hot and cold air mixing device of the present invention, one side of the hot air channel is fixedly connected to the duct wall of the cold air duct through an adaptive expansion deformation plate.

[0015] Beneficial effects of the present invention: The present invention adopts a design of advance distribution and multi-stage premixing. By arranging a hot air dividing plate on the upper part of the mixing device, the hot air is evenly distributed to multiple hot air channels. A guide plate is also arranged in each channel to promote the uniform distribution of the hot air along the height direction. This design can effectively promote the uniform mixing of cold and hot air media. The design of the adaptive expansion deformation plate is to cope with the stress deformation problem caused by the temperature difference on the mixing device. The expansion plate is plug-welded to the flue bottom plate at both ends, but gaps are left on both sides to allow it to deform freely with temperature changes. Such a design can absorb the deformation of the guide caused by the temperature difference under actual working conditions, thereby ensuring the overall safety of the mixing device and preventing safety accidents such as flue tearing or medium leakage caused by deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 work. Among them:

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0019] Figure 3 It is the effect diagram of the present invention before the mixer is installed.

[0020] Figure 4 This is a rendering of the present invention after adding a mixer.

[0021] In the figure:

[0022] 100, duct component; 101, hot air duct; 102, cold air duct; 200, mixing component; 201, hot air dividing plate; 202, hot air channel; 202a, arc guide plate; 202b, adaptive expansion deformation plate. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] Example 1

[0028] Reference Figure 1 , which is the first embodiment of the present invention, provides a graded premixed adaptive hot and cold air mixing device, which includes a duct component 100, including a hot air duct 101 and a cold air duct 102, a mixing component 200, including a hot air dividing plate 201 located on one side of the hot air duct 101, and a hot air channel 202 is installed on one side of the hot air dividing plate 201.

[0029] Specifically, one side of the hot air duct 101 is an inlet, and the hot air enters the duct from the inlet. One side of the hot air duct 101 is an outlet, and the hot air flows from the outlet to the subsequent duct. Both ends of each hot air dividing plate 201 are fixedly connected to the ends of the adjacent hot air channels 202.

[0030] The hot air medium first enters the mixing device through the hot air duct 101. At the top of the mixing device, the hot air dividing plate 201 evenly distributes the hot air to multiple hot air channels 202. A guide plate is provided in each hot air channel 202 to ensure that the hot air is evenly distributed along the height direction. Subsequently, the hot air flows out from these hot air channels 202 and finally flows into the cold air duct 102 to mix with the cold air medium to achieve a uniform temperature effect.

[0031] Example 2

[0032] Reference Figures 1-2, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: a hot air channel 202 is fixedly connected to the outlet of the hot air duct 101, and the hot air channel 202 is provided with a plurality of plates. The two side plates of the hot air channel 202 are trapezoidal, and the oblique side of the hot air channel 202 is in the same direction as the flow direction of the cold air. Each hot air channel 202 is fixedly connected with a plurality of arc guide plates 202a along the trapezoidal inclined surface.

[0033] Furthermore, each arc guide plate 202a is arranged in parallel, and each arc guide plate 202a is arranged at equal intervals along the trapezoidal slope of the hot air channel 202. The hot air dividing plate 201 is arched as a whole. There are several hot air dividing plates 201, and the hot air dividing plates 201 are fixedly connected to the hot air channel 202 near the hot air duct 101.

[0034] The hot air channels 202 are evenly distributed at the air outlet of the hot air duct 101. This layout helps to evenly distribute the hot air medium. Inside each hot air channel 202, a plurality of arc-shaped guide plates 202a are fixedly connected at equal intervals along the trapezoidal slope, and these guide plates are arranged in parallel. The purpose of this design is to enable the hot air medium to enter the cold air duct 102 in layers and evenly.

[0035] Among them, one end of the arc guide plate 202a close to the trapezoidal slope is parallel to the cold air duct 102, so that when the hot air flows out of the hot air channel 202, the arc guide plate 202a will change the flow direction of the hot air to make it consistent with the flow direction of the cold air medium, thereby promoting the effective mixing of the two media. The hot air dividing plate 201 is located between two adjacent hot air channels 202, and the top is arched, which helps the hot air medium to flow smoothly from the hot air duct 101 into each hot air channel 202. Through this structural design, it is ensured that the hot air medium can enter the cold air duct 102 evenly and orderly, thereby achieving an efficient mixing effect.

[0036] Example 3

[0037] Reference Figures 1 to 4 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the outer wall of the hot air channel 202 is fixedly connected with a cold air duct 102, and the diameter of the cold air duct 102 is larger than the sum of the diameters of all the hot air channels 202.

[0038] A hot air channel 202 is fixedly connected to the side wall of one side of the cold air duct 102, and the entire hot air channel 202 is completely placed inside the cold air duct 102. The diameter of the cold air duct 102 is greater than the sum of the diameters of all hot air channels 202, and such a design facilitates effective mixing of hot air medium and cold air medium in the cold air duct 102.

[0039] Furthermore, the cold air duct 102 is arranged vertically to the hot air duct 101, and the cold air of the cold air duct 102 flows from the opposite side of the trapezoidal hypotenuse of the hot air channel 202 to the trapezoidal hypotenuse of the hot air channel 202, and one side of the hot air channel 202 is fixedly connected to the duct wall of the cold air duct 102 through an adaptive expansion deformation plate 202b.

[0040] The flow directions of the cold air and the hot air are designed to be the same, so that the two media can contact and mix more fully when they meet. After the hot air medium flows out of the hot air channel 202, it flows along the direction of the guide plate, while the cold air enters from the opposite direction. The two flow in the same direction, avoiding the disturbance of the two fluids and thus reducing the flow rate, thereby improving the mixing uniformity.

[0041] By arranging an adaptive expansion deformation plate 202b on one side of the hot air channel 202 and fixing it to the pipe wall of the cold air duct 102, the deformation of the guide caused by temperature change can be absorbed in actual operation. The design of the adaptive expansion deformation plate 202b can be deformed freely under the action of temperature difference to prevent the mixing device or flue from being broken due to stress concentration. This not only protects the equipment itself, but also avoids potential safety risks such as medium leakage, thereby improving the safety performance of the entire system.

[0042] When in use, the hot air medium is connected to the cold air duct 102 through the hot air duct 101. At the upper part of the mixing device, the hot air medium is evenly distributed to a plurality of hot air channels 202 through the hot air dividing plate 201, and a guide plate is arranged in the channel. Through the above structure, the hot air medium is evenly distributed along the height direction. The cold air medium flows through the interval channel outside the hot air channel 202. The two streams of medium meet and mix after the mixing device to achieve a uniform temperature effect.

[0043] Since the hot air channel 202 circulates hot air medium, and the cold air medium circulates in the gap between the cold air duct 102 and the hot air channel 202, the wall plate of the hot air channel 202 will expand and contract under the temperature difference. The bottom of the hot air channel 202 is connected to the flue bottom plate at both ends by plug welding through an adaptive expansion deformation plate 202b. The thermal deformation can be absorbed by the deformation in the height direction to ensure the overall safety of the mixing device.

[0044] From the data provided, before the mixer was installed, the highest temperature was 608K, the lowest temperature was 482K, the temperature distribution range after cold and hot mixing was 126K, and the relative standard deviation was 7.6%; after the mixer of the present invention was installed, the highest temperature was 583K, the lowest temperature was 527K, the range was 56K, and the relative standard deviation was reduced to 1.9%. This significantly improves the temperature uniformity after the cold and hot air are mixed, and improves the mixing effect.

[0045] 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.

[0046] 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.

[0047] 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 graded premixed adaptive cold and hot air mixing device, characterized in that: include, The duct component (100) comprises a hot air duct (101) and a cold air duct (102). The mixing component (200) comprises a hot air dividing plate (201) located on one side of the hot air duct (101), and a hot air channel (202) is installed on one side of the hot air dividing plate (201).

2. The hierarchical premixed adaptive cold and hot air mixing device according to claim 1 is characterized in that: One side of the hot air duct (101) is an inlet, and hot air enters the duct from the inlet. One side of the hot air duct (101) is an outlet, and hot air flows from the outlet to the subsequent duct.

3. The hierarchical premixed adaptive cold and hot air mixing device according to claim 2 is characterized in that: The hot air channel (202) is fixedly connected to the outlet of the hot air duct (101), and a plurality of hot air channels (202) are provided.

4. The hierarchical premixed adaptive cold and hot air mixing device according to claim 3 is characterized in that: The two side plates of the hot air channel (202) are trapezoidal, the oblique sides of the hot air channel (202) are in the same direction as the flow direction of the cold air, and each hot air channel (202) is fixedly connected inside with a plurality of arc-shaped guide plates (202a) along the trapezoidal oblique surfaces.

5. The hierarchical premixed adaptive cold and hot air mixing device according to claim 4 is characterized in that: Each of the arc-shaped guide plates (202a) is arranged in parallel, and each of the arc-shaped guide plates (202a) is arranged at equal intervals along the trapezoidal slope of the hot air channel (202).

6. The hierarchical premixed adaptive cold and hot air mixing device according to any one of claims 1 to 5, characterized in that: The hot air dividing plate (201) is arched as a whole, a plurality of the hot air dividing plates (201) are provided, and the hot air dividing plates (201) are fixedly connected to the hot air channel (202) on a side close to the hot air duct (101).

7. The hierarchical premixed adaptive cold and hot air mixing device according to claim 6 is characterized in that: Both ends of each of the hot air dividing plates (201) are fixedly connected to the adjacent ends of the hot air channels (202).

8. The hierarchical premixed adaptive cold and hot air mixing device according to claim 7 is characterized in that: The outer wall of the hot air channel (202) is fixedly connected to the cold air duct (102), and the diameter of the cold air duct (102) is greater than the sum of the diameters of all the hot air channels (202).

9. The hierarchical premixed adaptive cold and hot air mixing device according to claim 8, characterized in that: The cold air duct (102) is arranged perpendicularly to the hot air duct (101), and the cold air of the cold air duct (102) flows from the opposite side of the trapezoidal oblique side of the hot air channel (202) to the trapezoidal oblique side of the hot air channel (202).

10. The hierarchical premixed adaptive cold and hot air mixing device according to claim 9, characterized in that: One side of the hot air channel (202) is fixedly connected to the duct wall of the cold air duct (102) via an adaptive expansion deformation plate (202b).

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