Online cleaning device for air pre-heater

Abstract

The utility model provides an air pre-heater on-line cleaning device which comprises a main pipe, a nozzle and a fairing, the nozzle and the fairing are installed on the main pipe, the fairing surrounds the nozzle, and a spray head of the nozzle is arranged in the fairing. The fairing is provided with an injection hole, and the injection hole is used for sucking gas outside the fairing into the fairing through the injection hole by means of the injection effect of the nozzle. The online cleaning device for the air pre-heater has the advantages that the fairing is arranged on the periphery of the nozzle on the main pipe, and the injection hole capable of enabling jet flow of the nozzle to trigger the injection effect is formed in the fairing, so that gas outside the fairing is combined with the jet flow of the nozzle to form mixed jet flow with larger impact force, larger flow and higher temperature; and on the premise of not increasing the cleaning consumption and even reducing the cleaning consumption, the cleaning effect and the cleaning efficiency of the nozzle can be obviously improved.

Description

Technical Field

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

[0003] In existing technologies, the main online cleaning methods for rotary air preheaters include steam soot blowing, high-pressure water flushing, and high-pressure high-temperature air soot blowing. These three cleaning methods, which use nozzles (or spray heads), all suffer from high cleaning costs in terms of energy consumption (such as heating and compression media) or resource usage.

[0004] To address the above issues, some publicly available technical documents offer solutions that improve the spraying method of the nozzles (or spray heads) to enhance cleaning effectiveness and efficiency without unnecessarily increasing cleaning consumption. For example, the portable air preheater cleaning device disclosed in Chinese invention patent CN201810032328.X, and the online air preheater component cleaning device disclosed in Chinese utility model patent CN202323312733.2, both utilize nozzle rotation or oscillation to increase coverage and improve cleaning efficiency and effectiveness. However, these improvements to the nozzle spraying method require additional kinetic energy devices and transmission structures, increasing the burden of subsequent maintenance. Ultimately, they only offer a limited increase in nozzle (or spray head) cleaning effectiveness and efficiency, failing to significantly improve cleaning effectiveness and efficiency without unnecessarily increasing or even appropriately reducing cleaning consumption.

[0005] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing an online cleaning device for air preheaters. This device improves upon the problem that existing technologies cannot significantly enhance the cleaning effect and efficiency of nozzles without increasing cleaning consumption. It enhances the impact force, flow rate, and temperature of the nozzle jet through the "ejection effect" to significantly improve the cleaning effect and efficiency.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: it includes a main pipe, a nozzle, and a shroud. The nozzle and the shroud are mounted on the main pipe, the shroud surrounds the nozzle, and the nozzle head is located inside the shroud. The shroud is provided with an ejector hole, which is used to draw gas outside the shroud into the interior of the shroud through the ejector effect of the nozzle.

[0008] Based on the above, the main pipe is connected to a pipeline that provides a pulse medium to the main pipe.

[0009] Based on the above, the main pipe is an arc-shaped pipe.

[0010] Based on the above, the ejector hole is located near the root of the nozzle.

[0011] Based on the above, the fairing includes two side plates, the length extension direction of the side plates is consistent with the length extension direction of the main tube, the main tube is provided with a plurality of nozzles, the nozzles are disposed between the two side plates, and the ejection port is disposed on the side plate.

[0012] Based on the above, two adjacent nozzles on the main tube are respectively positioned close to the two side plates of the fairing so that the nozzles are staggered.

[0013] Based on the above, the ejector hole corresponding to the nozzle is located on the side plate away from the nozzle, or the ejector hole corresponding to the nozzle is located on the two side plates on both sides of the nozzle.

[0014] Based on the above, a side plate base is fixedly provided on the main tube, and the length extension direction of the side plate base is consistent with the length extension direction of the main tube. The side plate is fixedly provided on the side plate base.

[0015] Based on the above, the side plate is provided with a wing plate or an ear plate, the wing plate or the ear plate is provided with an oblong hole, and the side plate base is provided with a threaded hole. The threaded hole, the oblong hole and the bolt are used to adjust the relative position between the side plate and the nozzle.

[0016] Based on the above, the main tube is provided with a nozzle base plate, the nozzle is mounted on the nozzle base plate, and the length extension direction of the nozzle base plate is consistent with the length extension direction of the main tube.

[0017] This invention has substantial features and advancements compared to existing technologies. Specifically, the air preheater online cleaning device of this invention has the following advantages: a rectifier is provided on the outer periphery of the nozzle on the main pipe, and an ejector hole is provided on the rectifier to induce an ejection effect in the nozzle jet. This allows the gas outside the rectifier to combine with the nozzle jet to form a mixed jet with greater impact force and flow rate. The ejection effect can also induce a mixing effect between the nozzle jet and the high-temperature gas at the hot end of the air preheater. The ejection effect and the mixing effect increase the overall jet flow rate, jet temperature, and jet impact force. Therefore, without increasing cleaning consumption or even reducing cleaning consumption, the cleaning effect and efficiency of the nozzle can be significantly improved. Moreover, the rectifier restricts the nozzle spray angle and the angle of the ejected gas to improve the cleaning effect and efficiency.

[0018] Meanwhile, the pulse characteristics of the pulse medium ejected from the nozzle can not only directly increase cleaning efficiency and cleaning effect, but also enhance the effect of the ejection effect caused by the ejection orifice; staggered nozzles can effectively enhance the ejection effect; the distance between the side plate and the nozzle can be adjusted by the side plate base; and the arc-shaped main tube can improve the rationality of cleaning. Attached Figure Description

[0019] Figure 1 This is a top view schematic diagram of the main tube structure in this utility model;

[0020] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure along line AA in the middle;

[0021] Figure 3 This is a three-dimensional perspective schematic diagram of the mother tube structure in this utility model;

[0022] Figure 4 This is a top view schematic diagram of the tube frame structure of this utility model;

[0023] In the figure, the attached reference numerals are:

[0024] Main tube 10, nozzle 11, fairing 12, ejector hole 101, side plate 121, waist-shaped hole 102, side plate base 13, nozzle base plate 14, connector 20, connecting pipe 30, pipe rack 100. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0026] Example 1

[0027] The air preheater online cleaning device of this embodiment includes a main pipe 10, on which nozzles 11 are provided. In practical applications, for example, the main pipe 10 can be set at the cold end or hot end inside the air preheater (hereinafter referred to as the air preheater). The nozzles 11 spray cleaning medium from the cold end or hot end of the air preheater toward the heat storage element (or heat exchange element) of the air preheater to complete the cleaning of the heat storage element of the air preheater. The main pipe 10 is connected to a medium pipeline that provides cleaning medium to the main pipe. The medium pipeline provides cleaning medium from the outside of the air preheater to the main pipe 10. The cleaning medium usually includes a combination of one or more of the following media: high-pressure water, high-pressure air, high-temperature and high-pressure air, high-pressure steam, and cleaning liquid.

[0028] The main pipe 10 is also equipped with a shroud 12, which surrounds the nozzle 11. The nozzle head of the nozzle 11 is located inside the shroud 12. The shroud 12 is used to limit the spray angle of the nozzle 11, and thus can improve the cleaning effect and cleaning efficiency. When multiple nozzles 11 are simultaneously limited in angle by the shroud 12, the jets of multiple nozzles 11 will form an air curtain (or water curtain).

[0029] The shroud 12 is provided with an ejector hole 101, which is located near the nozzle 11. The ejector hole 101 is used to draw gas from outside the shroud 12 into its interior through the "ejection effect" when the nozzle 11 is spraying gas. The shroud 12 also limits the flow angle of the ejected gas when the ejector hole 101 exerts its ejection effect. Furthermore, the location of the ejector hole 101 near the root of the nozzle 11 prevents the jet from the nozzle 11 from interfering with it, thus increasing the amount of ejected gas entering through the ejector hole 101. Moreover, multiple ejector holes 101 can be provided on the shroud 12 corresponding to the same nozzle 11 to draw gas into the shroud 12 from different angles and directions.

[0030] Regarding the "ejection effect" of nozzle 11 and ejector hole 101, specifically, when nozzle 11 sprays cleaning medium, a local low-pressure area is formed around nozzle 11 due to the high-speed movement of the sprayed cleaning medium. This local low-pressure area includes the area inside the shroud 12. At this time, the gas outside the shroud 12 is attracted into the local low-pressure area inside the shroud 12 through ejector hole 101, and is accelerated by the cleaning medium sprayed by nozzle 11, flowing along the jet direction of nozzle 11 to form a mixed jet with a larger flow rate, which increases the overall jet flow rate (the jet angle is limited by the shroud, which also further increases the jet flow rate). It can increase the cleaning coverage area without increasing the pressure and flow rate of the cleaning medium, thus reducing the overall cleaning consumption. At the same time, the ejector effect causes airflow in the direction of nozzle 11, reducing the shear stress between the jet of nozzle 11 and the gas in the air preheater. The ejected gas can also have kinetic energy superimposed with the jet of nozzle 11, which reduces the overall jet pressure loss of nozzle 11 and maintains the concentration and impact force of the cleaning medium sprayed by nozzle 11. Thus, the air preheater can be cleaned more efficiently while reducing the overall cleaning consumption. In addition, the turbulence generated at the target position by the ejector effect also helps to enhance the cleaning effect.

[0031] The "ejection effect" can also induce a mixing effect. Specifically, when the tube rack 100 is located at the hot end of the air preheater, the nozzle 11 and the shroud 12 are in a hot gas environment (for example, in the air preheater, the flue gas temperature outside the hot end shroud is 300–400°C). When the ejection effect induced by the nozzle 11, the shroud 12, and the ejector hole 101 draws the hot gas into the suction shroud 12, the hot gas mixes with the cleaning medium, which increases the temperature of the cleaning medium ejected by the nozzle 11. This helps to reduce the heating requirement for the cleaning medium, thereby reducing the overall cleaning consumption. Moreover, the increased temperature of the cleaning medium also helps to soften and pyrolyze the ash, thereby improving the cleaning efficiency. In addition, the increased temperature caused by the mixing effect can also increase the jet volume and thus increase the jet pressure and impact force, significantly improving the cleaning effect.

[0032] It should be noted that in practical applications, for example, this device typically uses high-temperature, high-pressure air as the cleaning medium at both the cold and hot ends of the air preheater. At the cold end, the high-temperature, high-pressure air can vaporize ammonium bisulfate (its melting point is 147°C) through high temperature. At the hot end, it prevents the low-temperature generation of ammonium bisulfate during injection (using a low-temperature cleaning medium would lead to its formation). Specifically, ammonium bisulfate is generated when the boiler uses SCR (Sequencing Controlled Reduction) for flue gas denitrification. Due to ammonia escape and factors such as high sulfur and high ash content in the coal, when the SO3 concentration in the flue gas exceeds the escaped NH3 concentration, ammonium bisulfate (ABS) is generated, causing blockage in the air preheater. The generation of ammonium bisulfate requires water; the main advantage of high-temperature, high-pressure air is that it does not carry more moisture. Based on the above, a shroud 12 is provided on the main pipe 10 at the cold or hot end of the air preheater to limit the spray angle of the nozzle 11. However, when high-temperature and high-pressure air is used as the cleaning medium, no ejector hole 101 is opened on the shroud 12 at the cold end of the air preheater (but when high-temperature and high-pressure air is not used as the cleaning medium, the ejector hole 101 can be opened as appropriate). This is because the temperature of the flue gas at the cold end of the air preheater is generally lower than the temperature of the injected high-temperature and high-pressure air, and the gas flow direction at the cold end of the flue gas is opposite to the injection direction. Opening the hole would reduce the temperature of the high-temperature and high-pressure air, which is not conducive to removing ammonium bisulfate. In addition, the gas flow direction on the hot end of the flue gas side is from top to bottom, and the temperature of the hot end of the flue gas side is higher than that of the high-temperature and high-pressure air. The direction of the cleaning medium is the same as the airflow direction on the flue gas side. Therefore, an ejector hole 101 is opened on the shroud 12 at the hot end of the flue gas side. In this environment, the ejection effect is superimposed with the mixing effect, which is more conducive to increasing the temperature, pressure and flow rate of the gas.

[0033] In this embodiment, a shroud 12 is provided around the nozzle 11 of the air preheater. The shroud 12 is used to limit the spray angle of the nozzle 11, which is beneficial to the concentration of the jet from the nozzle 11 and thus can improve the cleaning effect and cleaning efficiency. The shroud 12 is also provided with an ejector hole 101 that can induce an ejection effect in the jet from the nozzle 11. The ejection effect causes the gas outside the shroud 12 to combine with the jet from the nozzle 11 to form a mixed jet with greater impact force and flow rate, increasing the overall jet flow rate. Therefore, without increasing the cleaning consumption, or even reducing the cleaning consumption, the cleaning efficiency can be improved. This significantly improves the cleaning effect and efficiency of nozzle 11. Simultaneously, the ejector effect can induce a mixing effect between the jet from nozzle 11 and the high-temperature gas at the hot end of the air preheater. This mixing effect increases the jet temperature and pressure of nozzle 11, which can significantly improve the cleaning effect and efficiency of nozzle 11 without increasing cleaning consumption or even reducing it. Furthermore, when ejecting gas, the rectifier 12 can also limit the flow angle of the ejected gas, making the jet direction of the ejected gas more concentrated, thus improving the cleaning effect and efficiency.

[0034] Example 2

[0035] In this embodiment, the cleaning medium supplied to the main pipe 10 by the medium pipeline connected to the main pipe 10 is a pulse medium. When the nozzle 11 sprays the pulse medium, based on the characteristics of the pulse medium, the cleaning consumption will be reduced and the cleaning effect will be improved. The pulse medium typically includes pulse high-pressure water, pulse compressed air, pulse high-temperature and high-pressure air, pulse high-pressure steam, etc. The methods for generating the pulse medium are all existing technologies. For example, the release of the medium can be controlled by the opening and closing of a solenoid valve to generate a pulse, and the specifics will not be elaborated further.

[0036] When the jet ejected by nozzle 11 is a pulsed jet, its pulse characteristics significantly enhance the entrainment effect, thus better reducing cleaning consumption and enhancing cleaning effectiveness. Specifically, due to the pulsed characteristics of the pulsed cleaning medium, stronger turbulence and pressure fluctuations are generated, thereby promoting the mixing of gas in the air preheater with the jet from nozzle 11. This dynamic disturbance can more effectively entrain the surrounding medium, further enhancing the entrainment effect. At the same time, during the peak phase of the pulse, the flow velocity of the jet from nozzle 11 increases significantly due to the release of high pressure in a short time. The high flow velocity will greatly increase the instantaneous entrainment volume. Therefore, by optimizing the pulse parameters (frequency, duty cycle), energy consumption can be effectively reduced and the cleaning effect enhanced. Moreover, when the main pipe 10 is at the hot end of the air preheater, the combination of the pulsed medium and hot gas can also generate instantaneous high-pressure shock waves to enhance the pulsed cleaning effect.

[0037] In this embodiment, the pulse characteristics of the pulse medium ejected from the nozzle 11 can not only directly increase the cleaning efficiency and cleaning effect, but also enhance the effect of the ejection effect caused by the ejection hole 101, further significantly improving the cleaning effect and cleaning efficiency.

[0038] Example 3

[0039] In this embodiment, the fairing 12 includes two side plates 121, which are fixedly mounted on the outer wall of the main tube 10. The length extension direction of the two side plates 121 is consistent with the length extension direction of the main tube 10, that is, the two side plates are arranged in parallel. The main tube 10 is provided with a plurality of nozzles 11, which are located between the two side plates 121. An ejector hole 101 is provided on the side plate 121. Two end plates are provided at both ends of the two side plates 121. The two side plates 121 and the two end plates are combined to form the fairing 12.

[0040] The side plate 121 extending along the length of the main pipe 10 can surround the multiple nozzles 11 set on the main pipe 10 within the range of the shroud 12. The simple and robust structure can not only play the role of the shroud 12 in limiting the jet angle (including the spray angle of the nozzle 11 and the angle of the entrained gas) but also play a role in the entrainment effect. When the angle of multiple nozzles 11 is limited by the shroud 12 at the same time, the jets of multiple nozzles 11 will form an air curtain (or water curtain), which is beneficial to enhancing the cleaning effect and cleaning efficiency.

[0041] like Figure 1 As shown, two adjacent nozzles 11 on the main tube 10 are staggered and positioned close to the two side plates 121 of the shroud 12. The staggered arrangement and the proximity of the nozzles 11 to the two side plates 121 allow the side plates 121 to not only limit the spray angle of the nozzles 11 but also increase the overall range of the spray jet from the nozzles 11.

[0042] In the two side plates, the ejector hole 101 corresponding to the nozzle 11 is located on the side plate 121 away from the nozzle 11, or the ejector hole 101 corresponding to the nozzle 11 is located on the two side plates 121 on both sides of the nozzle 11. In this way, within the space within the limited fairing 12, there is a larger space between the side plate 121 farther from the nozzle 11 (this side plate is provided with the ejector hole 121 corresponding to the nozzle 11) and the nozzle 11, which allows a larger flow rate of ejected gas to pass through smoothly; moreover, the ejector holes 101 on the two side plates 121 that allow a larger flow rate of ejected gas to pass through are also spaced apart, preventing mutual interference when gas outside the fairing 12 is attracted, which is conducive to the ejection effect attracting more gas outside the fairing 12 to smoothly reach the interior of the fairing 12.

[0043] In this embodiment, by staggering the nozzles 11 along the length of the shroud 12, the ejection effect is enhanced, both from the perspective of allowing a larger flow of ejected gas to pass smoothly through the ejector hole 101 and from the perspective of preventing gas outside the shroud 12 from interfering with each other when passing through the ejector hole 101.

[0044] Example 4

[0045] In this embodiment, a side plate base 13 is fixedly provided on the main tube 10. For example, the side plate base 13 can be an angle steel base. The two limbs (two protruding tips on the cross section) of the angle steel base can be fixed by welding to the main tube 10. The side plate base 13 is set on both sides of the nozzle 11.

[0046] The length extension direction of the side plate base 13 is consistent with the length extension direction of the mother tube 10. The side plate 121 is fixedly mounted on the side plate base 13. For example, the side plate 121 can be fixed on the side plate base 13 by welding.

[0047] The main tube 10 is provided with a nozzle base plate 14, and the nozzle 11 is mounted on the nozzle base plate 14. The length extension direction of the nozzle base plate 14 is consistent with the length extension direction of the main tube 10. The nozzle 11 is usually mounted on the main tube 10 by threads. However, the nozzle base plate 14 can replace the threaded hole on the main tube 10. By welding a nozzle base plate 14 to the main tube 10, the threads on the nozzle 11 and the main tube 10 can be prevented from failing due to impact force, thus reinforcing the nozzle 11.

[0048] The side plate 121 is provided with a wing plate or a lug plate, and the wing plate or lug plate is provided with a waist-shaped hole 102. The side plate base 13 is provided with a threaded hole. The threaded hole, the waist-shaped hole 102 and the bolts are used to adjust the relative position between the side plate 121 and the nozzle 11. This is beneficial to adjust the distance between the side plate 121 and the ejector hole 101 on it and the nozzle 11 according to the required parameters. After the distance is adjusted, the side plate 121 is temporarily fixed to the side plate base 13 by bolts. Then the side plate 121 and the side plate 13 can be fixed by welding.

[0049] In this embodiment, the nozzle 11 can be firmly fixed to the mother tube 10 by the nozzle base plate 14, and the side plate 121 can be firmly fixed to the mother tube 10 by the side plate base 13. Moreover, the distance between the side plate 121 and the nozzle 11 can be adjusted by the waist-shaped hole 102 to maximize the side plate 121's function of limiting the angle and the ejector hole 101's function of ejection.

[0050] Example 5

[0051] In this embodiment, the main pipe 10 is an arc-shaped pipe, the side plate 121 is an arc-shaped plate, the side plate base 13 is an arc-shaped base (such as an angle steel base with an arc), and the nozzle base plate 14 is an arc-shaped plate. The arc design can improve the rationality of cleaning the air preheater heat storage element and avoid the phenomenon of over-cleaning some places and under-cleaning some places.

[0052] Example 6

[0053] like Figure 4 As shown, in this embodiment, multiple mother pipes 10 are included. The multiple mother pipes 10 are on the same plane, and the nozzles 11 on the multiple mother pipes 10 have the same orientation. The multiple mother pipes 10 are interconnected and communicate with each other through connecting pipes 30. One of the multiple mother pipes 10 is provided with a connector 20 for connecting medium pipeline. The mother pipes 10, connectors 20, and connecting pipes 30 form a pipe rack 100.

[0054] In practical applications, for example, the tube rack 100 can be set at the upper end (generally the hot end) or the lower end (generally the cold end) of the heat storage element of the rotary air preheater. The nozzle 11 faces the heat storage element of the rotary air preheater. The tube rack 100 moves in a reciprocating linear motion along the radial direction of the heat storage element of the air preheater. During the movement, the cleaning work of the heat storage element of the air preheater is completed. In conjunction with Embodiment 5, the arc design can improve the rationality of cleaning the heat storage element of the air preheater.

[0055] In conjunction with the above embodiments, the air preheater online cleaning device of this utility model has a rectifier 12 provided on the outer periphery of the nozzle 11 on the main pipe 10. The rectifier 12 is provided with an ejector hole 101 that allows the jet from the nozzle to induce an ejection effect, so that the gas outside the rectifier 12 combines with the jet from the nozzle 11 to form a mixed jet with greater impact force and flow rate, increasing the overall jet flow rate. Therefore, without increasing cleaning consumption or even reducing cleaning consumption, it can significantly improve the cleaning effect and efficiency of the nozzle. Moreover, the rectifier restricts the spray angle of the nozzle and the angle of the ejected gas to improve the cleaning effect and efficiency. At the same time, the pulse characteristics of the pulse medium ejected from the nozzle 11 can not only directly increase the cleaning efficiency and cleaning effect, but also enhance the effect of the ejection effect induced by the ejector hole 101; the staggered nozzles 11 can effectively enhance the ejection effect; the distance between the side plate 121 and the nozzle 11 can be adjusted by the side plate base 13; the arc-shaped design of the main pipe 10 can improve the rationality of cleaning.

[0056] 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 online cleaning device for an air preheater, characterized in that, The device includes a main pipe (10), a nozzle (11), and a shroud (12). The nozzle (11) and the shroud (12) are mounted on the main pipe (10). The shroud (12) surrounds the nozzle (11). The nozzle head of the nozzle (11) is located inside the shroud (12). The shroud (12) is provided with an ejector hole (101). The ejector hole (101) is used to draw gas outside the shroud (12) into the interior of the shroud (12) through the ejector effect of the nozzle (11).

2. The on-line air-preheater cleaning device of claim 1, wherein, The main pipe (10) is connected to a conduit that provides a pulse medium to the main pipe (10).

3. The on-line air-preheater cleaning device of claim 1, wherein, The main tube (10) is an arc-shaped tube.

4. The on-line air-preheater cleaning device of claim 1, wherein, The ejector hole (101) is located near the root of the nozzle (11).

5. The on-line cleaning device for air preheaters as claimed in claim 1 or 2 or 3 or 4 wherein, The fairing (12) includes two side plates (121), the length extension direction of the side plates (121) is consistent with the length extension direction of the main tube (10), the main tube (10) is provided with a plurality of nozzles (11), the nozzles (11) are located between the two side plates (121), and the ejector hole (101) is located on the side plate (121).

6. The on-line air preheater cleaning device of claim 5, wherein, The two adjacent nozzles (11) on the main tube (10) are respectively close to the two side plates (121) of the fairing (12) so that the nozzles (11) are staggered.

7. The on-line air-preheater cleaning device of claim 6, wherein, The ejector hole (101) corresponding to the nozzle (11) is located on the side plate (121) away from the nozzle (11), or the ejector hole (101) corresponding to the nozzle (11) is located on the two side plates (121) on both sides of the nozzle (11).

8. The on-line air-preheater cleaning device of claim 5, wherein, A side plate base (13) is fixedly provided on the main tube (10). The length extension direction of the side plate base (13) is consistent with the length extension direction of the main tube (10). The side plate (121) is fixedly provided on the side plate base (13).

9. The on-line air-preheater cleaning device of claim 8, wherein, The side plate (121) is provided with a wing plate or an ear plate, and the wing plate or the ear plate is provided with a waist-shaped hole (102). The side plate base (13) is provided with a threaded hole. The threaded hole, the waist-shaped hole (102) and the bolt are used to adjust the relative position between the side plate (121) and the nozzle (11).

10. The air preheater online cleaning device according to claim 1, 2, 3, or 4, characterized in that, The main tube (10) is provided with a nozzle base plate (14), and the nozzle (11) is installed on the nozzle base plate (14). The length extension direction of the nozzle base plate (14) is consistent with the length extension direction of the main tube (10).

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