Online pulse cleaning device for air pre-heater

Abstract

The utility model provides an air pre-heater on-line pulse cleaning device which comprises a pipe frame and a medium pipeline, the pipe frame comprises a main pipe, and a nozzle is arranged on the main pipe; the pipe frame is provided with a multi-medium coupler, the multi-medium coupler is connected with the mother pipe, the multi-medium coupler is communicated with the medium pipelines, the multi-medium coupler is used for converging media provided by the medium pipelines, and one or more medium pipelines provide pulse media. The online pulse cleaning device for the air pre-heater has the advantages that the multi-medium coupler is fully and uniformly combined with various cleaning media through the impact force of the pulse media, the confluence effect when the cleaning media are mixed or coupled can be fully exerted, and the overall cleaning effect and cleaning efficiency are improved; and the cleaning media are converged near the nozzles and the mother pipe, so that the occupation of the external space of the air pre-heater is reduced, and the loss of more conveying pressure of the converged cleaning media (particularly pulse media) is avoided.

Description

Technical Field

[0001] This utility model relates to a rotary air preheater cleaning device, specifically, an online pulse cleaning device for an air preheater. Background Technology

[0002] Boilers are widely used as key equipment in many industries such as power and chemical engineering, and air preheaters (hereinafter referred to as air preheaters) are an indispensable and important component of boiler systems. Their main function is to use the waste heat of the flue gas at the tail end of the boiler to heat the air required for combustion, thereby improving the boiler's thermal efficiency, reducing the flue gas temperature, and reducing energy consumption. However, in actual operation, air preheaters face a serious problem of ash accumulation and blockage. Because boilers burn a variety of fuels, such as coal, heavy oil, and biomass co-firing, these fuels produce various impurities and particulate matter during combustion, which flow through the air preheater along with the flue gas. At the same time, water vapor, acidic gases, and other components in the flue gas undergo complex physicochemical reactions with the ash, causing the ash to gradually accumulate on the heat exchange surface of the air preheater. Specifically, the boiler uses SCR for flue gas denitrification. Due to factors such as ammonia escape and high sulfur and high ash content coal, when the SO3 concentration in the flue gas is greater than the escaped NH3 concentration, ammonium bisulfate (ABS) is produced, causing blockage of the air preheater. The production of ammonium bisulfate requires the participation of water. Ammonium bisulfate has a melting point of 147℃ and can be vaporized at high temperature.

[0003] In existing technologies, the cleaning methods for rotary air preheaters that require the use of high-pressure nozzles (or nozzles) mainly include high-pressure water flushing, steam soot blowing, and high-temperature high-pressure air soot blowing. Specifically: high-pressure water flushing devices are mostly only suitable for thoroughly removing sticky ash during shutdown maintenance; the advantage of steam soot blowing devices is their high pressure, which can break up large clumps, but the large amount of water they carry can promote the formation of ammonium bisulfate (ABS), leading to air preheater blockage; high-temperature high-pressure air soot blowing devices are suitable for both cold and hot ends, and their main advantage is that they do not carry more water, can vaporize ammonium bisulfate (ABS), and prevent the formation of ammonium bisulfate (ABS) at the hot end due to the low temperature of the medium, but the pressure of high-temperature high-pressure air may not be as high as that of steam soot blowing devices and high-pressure water flushing devices.

[0004] Therefore, among the online cleaning methods for rotary air preheaters using nozzles (or nozzles), the use of high-temperature and high-pressure air blowing devices has many advantages. However, in order to compensate for the disadvantage that the pressure of high-temperature and high-pressure air blowing devices is not as high as that of steam blowing devices and high-pressure water flushing devices, under certain operating conditions, it is necessary to combine high-temperature and high-pressure air with other media.

[0005] Some publicly available technical solutions also disclose methods that use a combination of multiple media to clean air preheaters (no prior art data was found on cleaning devices using high-temperature, high-pressure air as the cleaning medium, so the high-pressure hot water flushing device described below is used as an example). For example, the rotary air preheater high-pressure head low-flow non-isolated online cleaning device disclosed in Chinese invention patent CN201610278060.9 uses a chemical addition device to mix the chemical agent with the cleaning medium (hot water). The mixed solution is then pumped by a high-pressure water pump and cleaned using a telescopic soot blower (equipped with nozzles). However, the published document requires additional stirring equipment to mix different media, increasing the external space occupied by the equipment; moreover, the stirring equipment can only be applied to a small number of cleaning media that can be mixed with each other (such as the mixing ratio of high-pressure water and cleaning fluid to form a cleaning solution), and cannot be applied to cleaning media that cannot be mixed with each other (such as water and air, air and cleaning agent, air and steam, etc.), which has limitations; in addition, since the pressure loss of mixed cleaning media in pipelines is usually higher than that of single cleaning media, the scheme of mixing before transportation will lose some of the pressure of the cleaning media, especially for special media (such as pulse media).

[0006] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies and improve upon the problems of existing technologies, such as the inability to fully combine multiple cleaning media, the limitation on the types of cleaning media that can be mixed, and the space occupied by the mixing device. Therefore, this invention provides an online pulse cleaning device for air preheaters that can fully and uniformly combine multiple cleaning media using pulse media, and can reduce the pressure loss of media transportation and reduce the external space occupied by the equipment.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: it includes a pipe rack and a medium pipeline. The pipe rack includes a main pipe, and the main pipe is provided with a nozzle. The pipe rack is provided with a multi-medium coupler, which is connected to the main pipe and communicates with multiple medium pipelines. The multi-medium coupler is used to combine the medium provided by the medium pipelines, and one or more medium pipelines provide pulsed medium.

[0009] Based on the above, the pipe rack includes multiple mother pipes, adjacent mother pipes are connected by connecting pipes, and the multi-medium coupler is connected to one of the middle mother pipes among the multiple mother pipes.

[0010] Based on the above, the multi-medium coupler is provided with a reduced diameter or current-limiting structure.

[0011] Based on the above, the medium pipeline includes a first medium pipe, which is a straight rigid pipe. A portion of the first medium pipe is retractably disposed within a telescopic drive device, and the first medium pipe is extended and retracted by the telescopic drive device.

[0012] Based on the above, the pipe rack also includes a through pipe, which passes through the main pipe to connect the multi-medium coupler and the first medium pipe respectively. The through pipe and the main pipe through which it passes are fixedly connected and independently communicated.

[0013] Based on the above, the medium pipeline includes a second medium pipe, the second medium pipe includes multiple rotating joints, the pipeline between adjacent rotating joints is set as a joint conduit, the joint conduit is a rigid pipe, the rotation axes of the multiple rotating joints are parallel, the rotation axes of the rotating joints are perpendicular to the moving direction of the pipe rack, and the pipe rack moves in a straight line.

[0014] Based on the above, the second dielectric tube provides a pulse medium.

[0015] Based on the above, the end of the joint conduit is designed as a quarter-circle tube.

[0016] Based on the above, it also includes a guide rail and guide wheel assembly. The guide wheel assembly includes a connecting frame and a guide wheel. The guide wheel is rotatably mounted on the connecting frame. The connecting frame is fixedly connected to the pipe frame. The guide wheel is rolled above the guide rail. The guide wheel causes the connecting frame to be mounted on the guide rail.

[0017] Based on the above, the guide wheel assembly also includes a balance wheel, which is elastically connected to the connecting frame. The balance wheel is pushed against the bottom of the guide rail by the elastic force, and the balance wheel and the guide wheel are pushed together by the elastic force to clamp the guide rail.

[0018] This invention has substantial features and advancements compared to existing technologies. Specifically, the online pulse cleaning device for air preheaters of this invention has the following advantages: the multi-medium coupler utilizes the impact force of the pulse medium to fully and uniformly combine multiple cleaning media, which can fully utilize the merging effect when the cleaning media are mixed or coupled, thereby improving the overall cleaning effect and efficiency; moreover, merging the cleaning media near the nozzle and the main pipe reduces the occupation of external space of the air preheater and avoids losing more of the conveying pressure of the merged cleaning media (especially the pulse medium).

[0019] Meanwhile, the multi-media coupler adopts a reduced diameter or flow-limiting structure, which can enhance the pulse effect while pressurizing; the first media pipe is connected to the multi-media coupler through a through pipe to simultaneously realize the functions of connection, linkage and driving, ensuring the structural strength and compactness of the overall pipe rack structure; the second media pipe, as a robotic arm-type pipe with a rotating joint, is suitable for passing pulse media, which facilitates precise control of pulse media parameters, improves the overall cleaning effect and cleaning efficiency, and reduces the pressure loss of pulse media delivery and the impact damage to the pipeline; the guide wheel assembly and guide rail ensure the stability of the pipe rack during movement. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the pipe rack structure of this utility model;

[0022] Figure 3 This is a partial structural schematic diagram of the medium pipeline and pipe support of this utility model;

[0023] Figure 4 This is a schematic diagram of the guide wheel assembly structure of this utility model;

[0024] Figure 5 yes Figure 4 Cross-sectional structural diagram of the central guide wheel assembly;

[0025] Figure 6 This is a schematic diagram of another guide wheel assembly structure of this utility model;

[0026] In the figure, the attached reference numerals are:

[0027] Pipe rack 100, main pipe 10, multi-media coupler 20, connecting pipe 30, through pipe 40;

[0028] First medium tube 200;

[0029] Second medium tube 300, rotary joint 310, joint conduit 320, check valve 330, expansion joint 340;

[0030] Telescopic drive device 400;

[0031] Guide rail 500, angle steel 510;

[0032] Guide wheel assembly 600, connecting frame 610, guide wheel 620, balance wheel 630, arc-shaped tube plate 611, support plate 612, spring sleeve 613, balance wheel bracket 614, telescopic cylinder 615. Detailed Implementation

[0033] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, the online pulse cleaning device for the air preheater in this embodiment includes a pipe rack 100 and a media pipeline. The pipe rack 100 includes a main pipe 10, on which nozzles are provided. The media pipeline provides cleaning media to the main pipe 10 and the nozzles. The pipe rack 100 is a rigid frame that can be moved as a whole, thereby increasing the cleaning range of the nozzles.

[0036] like Figure 2 As shown, in practical applications, for example, multiple nozzles can be arranged on the mother pipe 10 along the length of the mother pipe 10; at the same time, the overall movement direction of the pipe rack 100 is set to be perpendicular to the mother pipe 10 (perpendicular to the middle tangent of the mother pipe 10 when the mother pipe 10 is an arc-shaped pipe), which will further increase the cleaning range of the nozzles.

[0037] In practical applications, for example, the tube rack 100 can be installed inside the air preheater (hereinafter referred to as the air preheater). The medium pipeline provides cleaning medium to the tube rack 100 from the outside of the air preheater. The tube rack 100 can be installed at the cold end or hot end of the air preheater, so that the nozzles can be directed towards the heat storage elements of the air preheater at the cold end or hot end of the air preheater to complete the cleaning of the heat storage elements of the air preheater. The entire tube rack 100 can move radially along the heat storage elements inside the air preheater to achieve efficient coverage cleaning of the heat storage elements of the air preheater (cleaning coverage rate greater than 96%) when the air preheater is working online (when the heat storage elements are rotating).

[0038] The air preheater online pulse cleaning device in this embodiment also includes multiple media pipelines. To achieve the merging of cleaning media in the multiple media pipelines, a multi-media coupler 20 is also provided on the pipe rack 100. The multi-media coupler 20 is connected to the media pipelines, and the main pipe 10 is directly connected to and communicates with the multi-media coupler 20. The media pipelines provide cleaning media to the pipe rack 100 through the multi-media coupler 20, which is used to merge the cleaning media provided by the multiple media pipelines. Generally, the cleaning media typically include high-pressure water, high-pressure air, high-temperature and high-pressure air, high-pressure steam, cleaning fluid, etc.

[0039] It is worth noting that the word "coupling" in the name "multi-media coupler" is not a limitation on the related functions of the multi-media coupler 20. The multi-media coupler 20 can be used for the merging of multiple cleaning media (including pulse media) in either the form of "coupling" or "mixing". The following clarifies the definitions of "coupling" and "mixing" included in "merging" in this embodiment: "Coupling" refers to different cleaning media working together in coordination but maintaining an independent state during the cleaning process, completing the cleaning task together through their respective characteristics, such as the coupled use of high-pressure air (to blow away accumulated dust) and cleaning fluid (to dissolve accumulated dust); "Mixing" refers to different cleaning media being physically combined into a homogeneous mixture to form a new composite medium, such as the mixing ratio of high-pressure water and cleaning fluid to form a cleaning solution.

[0040] The multi-media coupler 20 is installed on the pipe rack 100 and directly connected to the pipe rack 100. The cleaning medium is first transported through the medium pipeline and then reaches the multi-media coupler 20 for merging. After merging, it is directly sent to the main pipe 10 and sprayed out by the nozzle. Since the pressure loss of the merged cleaning medium in the pipeline is usually higher than that of the single cleaning medium, compared with the scheme of setting the multi-media coupler 20 outside the air preheater, it is beneficial to reduce the pressure loss of the cleaning medium, save the overall cleaning consumption, and also reduce the space occupied outside the air preheater, thus saving equipment space.

[0041] In a multi-medium pipeline system, one or more media pipelines provide pulsed media to the pipe rack 100. The pulsed media typically include pulsed compressed air, pulsed high-temperature and high-pressure air, pulsed high-pressure steam, pulsed high-pressure water, etc. The methods for generating the pulsed media (i.e., the methods for providing the pulsed media to the media pipelines) are all existing technologies. For example, pulses can be generated by controlling the opening and closing of a solenoid valve, and the details will not be elaborated further.

[0042] Under certain conditions, when the multi-medium coupler 20 couples the pulse medium with other media, it will help to enhance the pulse effect. For example, the pressure fluctuation phases of the cleaning media provided by multiple media pipelines are matched, or the pulse medium is high-pressure hot air or high-pressure steam with strong compressibility.

[0043] Based on the pulse characteristics, in addition to the good cleaning efficiency and effect brought by the pulse characteristics themselves (such as reducing the flow requirements of continuous media and enhancing the cleaning effect by instantaneous high pressure), when the cleaning media of multiple channels in the multi-media coupler 20 merge, the pulse medium impacts other cleaning media, which is conducive to the full and uniform merging of multiple different media and will produce a synergistic effect of enhancing cleaning efficiency among multiple media.

[0044] Regarding the "mixing" effect in the confluence of the multi-media coupler 20, for example, when pulsed high-pressure water and cleaning agent are mixed in the multi-media coupler 20, the intermittent high-pressure impact of the pulsed high-pressure water on the cleaning agent will produce a cavitation effect, which will allow the cleaning liquid and high-pressure water to be fully mixed, which will also help to enhance the cleaning effect. Different media can be fully mixed without the need to add an additional stirring device.

[0045] Regarding the "coupling" effect of the multi-media coupler 20, for example, when pulsed high-pressure air and cleaning agent are coupled within the multi-media coupler 20, the pulsed high-pressure air intermittently impacts the cleaning agent with high pressure. The air expands rapidly due to the sudden pressure drop and violently combines with the cleaning agent, forming a large number of bubbles. These bubbles undergo a rapid expansion and compression cycle due to pressure fluctuations (pulse characteristics). Moreover, the pulsed high-pressure air can form turbulence, which, when the cleaning agent bubbles are sprayed, improves the cleaning fluid's coverage of complex surfaces (such as threads and grooves). Compared to directly spraying the cleaning agent or mixed solution onto the cleaning target, the coupling of cleaning agent bubbles and pulsed high-pressure air is more conducive to fully contacting the accumulated dirt and grime at the cleaning target and reacting with it, thus enhancing the cleaning agent's effectiveness.

[0046] It is worth noting that the cleaning media supplied to the multi-media coupler 20 by the multiple media pipelines can be different types of media, such as pulsed high-temperature and high-pressure air and cleaning agents, or they can be the same type of cleaning media but one of them has pulsed characteristics, such as pulsed high-temperature and high-pressure air and high-temperature and high-pressure air. Of course, they can also be two completely identical cleaning media, such as two media pipelines both supplying pulsed high-temperature and high-pressure air. Of course, "one or more media pipelines supplying pulsed media" is not a limitation on the cleaning media supplied by the media pipelines in this embodiment. The media pipelines in this embodiment may also not supply pulsed media, in which case the multi-media coupler 20 can still achieve the purpose of merging multiple cleaning media.

[0047] In this embodiment, the use of a multi-media coupler 20 installed on the pipe rack 100 is beneficial to reduce the pressure loss of the cleaning medium (especially the pulse medium) and also to reduce the space occupied by the air preheater to save equipment space. The multi-media coupler 20 is connected to the medium pipeline and utilizes the pulse medium to fully and uniformly combine multiple cleaning media, which can give full play to the merging effect when the cleaning media are mixed or coupled, and improve the overall cleaning effect and cleaning efficiency.

[0048] Example 2

[0049] In this embodiment, the pipe rack 100 includes multiple mother pipes 10, and adjacent mother pipes 10 are connected by connecting pipes 30, so that the pipe rack 100 as a whole is a rigid frame, which can be moved as a whole, and the cleaning range is increased when the whole is moved.

[0050] The multi-media coupler 20 is connected to one of the middle parent pipes 10 among the multiple parent pipes 10. After the combined cleaning media formed by the merging of multiple cleaning media is sent into the parent pipe 10, the cleaning media in this parent pipe 10 will flow to the other parent pipes 10 through the connecting pipe 30. Since this parent pipe 10 is located in the middle position among the multiple parent pipes 10, it is also beneficial to reduce the flow path of the cleaning media on the pipe rack 100, so as to reduce the pressure loss of the cleaning media in the pipe rack 100.

[0051] Example 3

[0052] In this embodiment, the multi-medium coupler 20 adopts a reduced diameter or current-limiting structure, which can enhance the pulse effect while increasing the pressure. The reduced diameter and current-limiting structure can be set at the pipeline before the confluence on the multi-medium coupler 20, or at the pipeline after the confluence on the multi-medium coupler 20.

[0053] Example 4

[0054] In this embodiment, the medium pipeline includes a first medium pipe 200, which is a straight rigid pipe. A portion of the first medium pipe 200 is telescopically disposed inside the telescopic drive device 400. The first medium pipe 200 is driven by the telescopic drive device 400 to extend and retract along its length. The relevant structures of the telescopic drive device 400 are all existing technologies. For example, a lead screw and nut structure or a gear and rack structure can be used to extend and retract the first medium pipe 200. Specifically, refer to the relevant structure of "drive device 3" similar to the telescopic drive device 400 shown in Chinese Invention Patent CN201710582916.6. The telescopic drive device 400 can be disposed outside the air preheater, and the first medium pipe 200 passes through the air preheater shell.

[0055] The first medium tube 200 is connected to the multi-medium coupler 20 and to the tube rack 100. When the first medium tube 200 extends or retracts, it will drive the tube rack 100 to extend or retract as well. In practical applications, the first medium tube 200 can be set to be perpendicular to the main tube 10 (the main tube 10 is a straight tube) or perpendicular to the middle tangent of the main tube 10 (the main tube 10 is an arc-shaped tube). In this case, the tube rack 100 moves along the length of the first medium tube 200, which helps to increase the cleaning coverage of the nozzle.

[0056] When the multi-medium coupler 20 is connected to one of the middle mother pipes 10 among the multiple mother pipes 10, in order to realize the connection between the first medium pipe 200 and the multi-medium coupler 20, and at the same time realize the connection between the first medium pipe 200 and the pipe rack 100, the pipe rack 100 is also provided with a through pipe 40; the through pipe 40 passes through the mother pipe 10 to connect the multi-medium coupler 20 and the first medium pipe 200 respectively, and the through pipe 40 and the mother pipe 10 through which it passes are fixedly connected and independently connected.

[0057] In practical applications, for example, reinforcing rings can be provided at the joints between the connecting pipe 30 and the main pipe 10, between the main pipe 10 and the multi-media coupler 20, between the multi-media coupler 20 and the through pipe 40, etc. The reinforcing ring is sleeved on the joint and fully welded to the interface to enhance the overall structural strength of the pipe rack 100.

[0058] In this embodiment, the main pipe 10, the multi-media coupler 20, the connecting pipe 30, and the through pipe 40 form a rigid pipe rack 100. The first medium pipe 200 is connected to the multi-media coupler 20 through the through pipe 40. The first medium pipe 200 achieves the effects of connection, connection, and drive through the through pipe 40. The entire pipe rack 100 can be in a plane. The first medium pipe 200 is connected to the through pipe 40 and drives the pipe rack 100 to move linearly (move on the plane where the pipe rack 100 can be located), ensuring the compactness and functionality of the overall structure of the pipe rack 100.

[0059] Embodiment 5

[0060] In this embodiment, the medium pipeline includes a second medium pipe 300. The second medium pipe 300 includes a plurality of rotating joints 310. The pipeline between adjacent rotating joints 310 is set as a joint conduit 320. The joint conduit 320 is made of a rigid pipe. Both ends of the joint conduit 320 are set as bent pipes to connect the rotating joints 310. The rotation axes of the plurality of rotating joints 310 are parallel, and the rotation axis of the rotating joint 310 is perpendicular to the moving direction of the pipe rack 100. The pipe rack 100 moves linearly. When the pipe rack 100 moves linearly, it drives the joint conduit 320 to move and causes the two ends of the rotating joint 310 to rotate relatively, resulting in relative movement between the head and tail ends of the second medium pipe 300. Specifically, the end of the second medium pipe 300 (i.e., the connection end with the multi-media coupler 20) can move with the movement of the pipe rack 100, and the head end is set at a fixed position. Generally, the head end of the second medium pipe 300 (i.e., the end far from the multi-media coupler 20) is fixedly provided on the outer shell of the air preheater, and a plurality of rotating joints 310 are all arranged inside the air preheater to achieve the relevant function that the end of the second medium pipe 300 can move relative to the head end. When the pipe rack 100 moves, the second medium pipe 300 can continuously provide cleaning medium for the pipe rack 100. Combining with the above-mentioned Embodiment 4, when the pipe rack 100 moves along the length direction of the first medium pipe 200, the rotation axis of the rotating joint 310 can be perpendicular to the axis of the first medium pipe 200.

[0061] Based on the characteristics of the second medium tube 300, when it moves with the tube rack 100, only the rotation joint 310 rotates, without any coiling or lengthening of the tube body. The overall length of the second medium tube 300 remains constant, which is beneficial for calculating the pulse pressure loss when the pulse medium passes through the second medium tube 300. This allows for more accurate control of the relevant parameters of the pulse medium reaching the multi-medium coupler 20. Therefore, the second medium tube 300 is suitable for providing pulse medium to precisely control the parameters of the pulse medium and improve the overall cleaning effect and cleaning efficiency.

[0062] In order to reduce the pressure loss of the cleaning medium in the second medium pipe 300 and reduce the impact of the pulse medium on the pipeline, the ends of the joint conduit 320 are all set as quarter-circular pipes, which refer to a circular pipe bent at 90 degrees (that is, the outlet and inlet of the quarter-circular pipe are at 90 degrees).

[0063] In addition, a check valve 330 can be installed at the connection between the second medium pipe 300 and the multi-medium coupler 20 to reduce the impact of the pulse medium on the second medium pipe 300; specifically, it can be set as a wafer check valve to reduce the volume occupied by the check valve.

[0064] In addition, an expansion joint 340 can be provided near the fixing point of the first end of the second medium tube 300 (i.e. the end away from the multi-medium coupler 20) to reduce stress deformation of the second medium tube 300 when it moves with the tube rack 100.

[0065] In this embodiment, the second medium pipe 300 is configured as a robotic arm type pipe with a rotating joint 310, which can change the position of the first and last ends as the pipe rack 100 moves. Because its length is constant and it is a rigid pipe, it is suitable for passing pulsed media, so as to reduce the pressure loss of pulsed media and the impact damage to the pipe.

[0066] Example 6

[0067] In this embodiment, the pipe rack 100 is movably mounted on the guide rail 500 via the guide wheel assembly 600. The guide wheel assembly 600 includes a connecting frame 610 and a guide wheel 620. The connecting frame 610 can be a U-shaped frame, and the guide wheel 620 is rotatably mounted on the connecting frame 610, specifically within the U-shaped groove of the U-shaped frame. The connecting frame 610 is fixedly connected to the pipe rack 100, and the guide wheel 620 is rotatably mounted above the guide rail 500, thus enabling the connecting frame 610 to be mounted on the guide rail 500.

[0068] In practical applications, for example, the guide rail 500 can be configured as a double-row guide rail. At the same time, the guide rail 500 can be configured as a suspended guide rail, with one end located inside the air preheater and the other end located on the air preheater shell. The tube support 100 is mounted on the guide rail 500 via the guide wheel assembly 600. In order to prevent the guide rail from blocking the nozzle spray, when the tube support 100 needs to be set at the hot end of the air preheater, it is generally set below the guide rail 500 with the nozzle facing downwards. When the tube support 100 needs to be set at the cold end of the air preheater, it is generally set above the guide rail 500 with the nozzle facing upwards.

[0069] In practical applications, for example, the connecting frame 610 can be connected to the connecting pipe 30 on the pipe rack 100. Compared to the connecting mother pipe 10, the connecting frame 610 can be fixed around the outer wall of the connecting pipe 30 using the arc-shaped tube plate 611 without affecting the nozzle's spraying function, making the connection between the pipe rack 100 and the connecting frame 610 more stable. When the pipe rack 100 needs to be set at the hot end of the air preheater, the arc-shaped tube plate 611 is set at the lower end of the connecting frame 610, at which time the connecting frame 610 is used to suspend the pipe rack 100; when the pipe rack 100 needs to be set at the cold end of the air preheater, the arc-shaped tube plate 611 is set at the upper end of the connecting frame 610, at which time the connecting frame 610 is used to support the pipe rack 100.

[0070] In practical applications, for example, the guide rail 500 can be made of I-beams, with reinforcing ribs between the web and flanges of the I-beams; an angle steel 510 can be fixedly installed above the guide rail 500, with reinforcing ribs between the two equal sides of the angle steel 510; the two equal sides of the angle steel 510 are fixedly welded to the top of the guide rail 500, and the guide wheel 620 is set as a concave guide wheel and travels on the angle steel 510, which can prevent the guide wheel 620 from slipping when dust accumulates on the guide rail 500.

[0071] In this embodiment, the guide wheel assembly 600 also includes a balance wheel 630, which is elastically connected to the connecting frame 610. Specifically, a support plate 612 can be fixedly installed below the connecting frame 610. The support plate 612 has a through groove, and a spring sleeve 613 and a spring are fixedly installed in the through groove. The balance wheel 630 is rotatably installed on the balance wheel bracket 614. The telescopic cylinder 615 at the bottom of the balance wheel bracket 614 is slidably installed in the spring sleeve 613 and is elastically pushed by the spring. The balance wheel 630 is pushed by the elastic force to abut against the bottom of the guide rail 500. The balance wheel 630 and the guide wheel 620 are pushed by the elastic force to clamp the guide rail 500, so that the tube frame 100 can be closely attached to the guide rail 500 during movement, preventing the "tilting" phenomenon and further preventing the guide wheel 620 from slipping.

[0072] In this embodiment, the guide wheel assembly 600 and the guide rail 500 ensure the stability of the pipe rack 100 when it moves, thereby enhancing the stability of the pipe rack 100 when cleaning the target, preventing the pipe rack 100 from shaking due to the backflow of the pulse medium, and ensuring that the expected cleaning effect is achieved.

[0073] In conjunction with the above embodiments, the online pulse cleaning device for air preheaters of this utility model, with the multi-medium coupler 20, utilizes the impact force of the pulse medium to fully and uniformly combine multiple cleaning media, which can give full play to the merging effect when the cleaning media are mixed or coupled, improve the overall cleaning effect and cleaning efficiency, and also reduce the occupation of the external space of the air preheater and the pressure loss of the cleaning medium (especially the pulse medium) during delivery.

[0074] Meanwhile, the multi-medium coupler 20 adopts a reduced diameter or flow-limiting structure, which can enhance the pulse effect while increasing pressure; the first medium pipe 200 is connected to the multi-medium coupler 20 through the through pipe 40 to simultaneously realize the functions of connection, connection and drive, ensuring the structural strength and compactness of the overall pipe rack 100; the second medium pipe 300, as a robotic arm-type pipe with a rotating joint 310, is suitable for passing pulse media, which can conveniently and accurately control the parameters of the pulse media to improve the overall cleaning effect and cleaning efficiency, and reduce the pressure loss of pulse media and the impact damage to the pipeline; the guide wheel assembly 600 and the guide rail 500 ensure the stability of the pipe rack 100 when it moves.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. An on-line pulse cleaning device for air preheaters, characterized in that, The device includes a pipe rack (100) and media pipelines. The pipe rack (100) includes a main pipe (10) with nozzles. The pipe rack (100) is equipped with a multi-media coupler (20) connected to the main pipe (10) and connected to multiple media pipelines. The multi-media coupler (20) is used to combine the media provided by the media pipelines, and one or more media pipelines provide pulsed media.

2. The on-line pulse cleaning device for air preheaters as claimed in claim 1 wherein, The pipe rack (100) includes multiple mother pipes (10), adjacent mother pipes (10) are connected by connecting pipes (30), and the multi-medium coupler (20) is connected to one of the middle mother pipes (10) among the multiple mother pipes (10).

3. The on-line pulse cleaning device for air preheaters as claimed in claim 1 wherein, The multi-medium coupler (20) is provided with a reduced diameter or current limiting structure.

4. The on-line pulse cleaning device for air preheaters as claimed in claim 1 or 2 or 3 wherein, The medium pipeline includes a first medium pipe (200), which is a straight rigid pipe. A portion of the first medium pipe (200) is telescopically disposed within a telescopic drive device (400), and the first medium pipe (200) is telescopically extended and retracted by the telescopic drive device (400).

5. The on-line pulse cleaning device for air preheaters as claimed in claim 4 wherein, The pipe rack (100) also includes a through pipe (40), which passes through the main pipe (10) to connect the multi-medium coupler (20) and the first medium pipe (200) respectively. The through pipe (40) and the main pipe (10) through which it passes are fixedly connected and independently communicated.

6. The on-line pulse cleaning device for air preheaters as claimed in claim 1 or 2 or 3 wherein, The medium pipeline includes a second medium pipe (300), which includes multiple rotating joints (310). The pipeline between adjacent rotating joints (310) is set as a joint conduit (320). The joint conduit (320) is a rigid pipe. The rotation axes of the multiple rotating joints (310) are parallel. The rotation axes of the rotating joints (310) are perpendicular to the moving direction of the pipe rack (100). The pipe rack (100) moves in a straight line.

7. The on-line pulse cleaning device for air preheaters as claimed in claim 6 wherein, The second medium tube (300) provides the pulse medium.

8. The on-line pulse cleaning device for air preheaters as claimed in claim 7 wherein, The end of the joint conduit (320) is a quarter-circle tube.

9. The on-line pulse cleaning device for air preheaters as claimed in claim 1 or 2 or 3 wherein, It also includes a guide rail (500) and a guide wheel assembly (600). The guide wheel assembly (600) includes a connecting frame (610) and a guide wheel (620). The guide wheel (620) is rotatably mounted on the connecting frame (610). The connecting frame (610) is fixedly connected to the pipe rack (100). The guide wheel (620) is rolled above the guide rail (500). The guide wheel (620) causes the connecting frame (610) to be mounted on the guide rail (500).

10. The on-line pulse cleaning device for air preheaters as claimed in claim 9 wherein, The guide wheel assembly (600) also includes a balance wheel (630), which is elastically connected to the connecting frame (610). The balance wheel (630) is pushed by the elastic force against the bottom of the guide rail (500), and the balance wheel (630) and the guide wheel (620) are pushed by the elastic force to clamp the guide rail (500).

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