Multifunctional spray flushing device for boiler air preheater

Abstract

The utility model relates to a multifunctional spray flushing device of boiler air preheater, including air preheater cold end body, still including the top plate of installation in air preheater cold end body upper end surface, top plate upper end is provided with the chassis seat, the pipe frame that is formed by pipeline is installed on the chassis seat, the fixed plate is fixed with along the length direction on the pipe frame upper end, the fixed plate upper end surface is equipped with the rack, the inside of pipe frame is provided with two slide rods in parallel, the slide block is slidably connected on the slide rod, two slide blocks outside are connected with the support plate respectively, two support plates upper end are fixed with two connecting plates, and the cleaning pipe is erected between two connecting plates, and one end of the cleaning head and the conveying telescopic pipe are installed on the cleaning pipe surface, the utility model drives the cleaning pipe reciprocating movement with motor drive gear rack, and the air preheater cold end is flushed with 80-90 DEG C fixed well water without stopping, and the cleaning parameter is accurately adjusted with PLC frequency conversion control, and the annual reduction stop is 240 hours, and the efficiency is improved 10%-15%, and the full load operation is prolonged more than 6 months.

Description

Technical Field

[0001] This utility model relates to the field of air preheater cleaning technology, specifically a multi-functional spray flushing device for boiler air preheaters. Background Technology

[0002] The boiler air preheater flushing device is a system installed in the boiler tail flue, specifically designed for online or offline cleaning of the air preheater's heating surfaces. It typically includes a high-pressure water pump, nozzles, piping, and a control system. Water, steam, or chemical cleaning agents can be used as the cleaning medium, depending on the requirements. During operation, fly ash, ammonium bisulfate (especially after the SCR denitrification system), and oil from the flue gas accumulate on the heat transfer elements, causing: ash blockage: reducing ventilation area and increasing flue gas resistance; decreased heat exchange efficiency: affecting boiler thermal efficiency; and increased corrosion risk: especially low-temperature corrosion. Increased power consumption of induced draft fans / forced draft fans can lead to boiler shutdown and ash removal in severe cases. Therefore, the main function of the flushing device is to remove ash and sticky deposits from the heat storage elements of the air preheater; restore their heat transfer performance and flow capacity; extend equipment life and ensure safe and economical boiler operation.

[0003] Currently, many power plants (especially small and medium-sized or older units) still use offline high-pressure water flushing as the main cleaning method for air preheaters. This method requires the boiler to be completely shut down and the air preheater to be manually or semi-automatically flushed after the flue gas temperature drops to a safe range. Although this mode has a relatively thorough cleaning effect, it brings significant problems in operation economy and dispatch flexibility: the boiler must be shut down before operation; the shutdown period is long (usually 24 to 72 hours); the fuel consumption during start-up and shutdown is huge; and it affects grid dispatch and power generation revenue, which are key factors leading to long downtime.

[0004] Long waiting time for cooling The air preheater is located in the flue at the tail end of the boiler. During normal operation, the flue gas temperature can reach 300~400℃. High-pressure water flushing requires the metal wall temperature to drop below 80℃ (to prevent thermal stress deformation or water hammer damage). Otherwise, cold water contacting high-temperature components will cause: thermal shock leading to deformation of the corrugated plate; local stress concentration causing cracks; and loosening or even collapse of the heat storage element structure. The boiler's natural cooling rate is slow, and forced ventilation cooling is limited by equipment safety regulations, usually requiring more than 12~24 hours to meet the flushing conditions. Rinsing process time: Rinsing must be carried out layer by layer and area by area to ensure full coverage; operations such as moving, positioning, draining, and repeated rinsing rely on manual or semi-automatic equipment; if the ash accumulation is severe (such as ammonium bisulfate clumping, oil and coke mixture), repeated rinsing is required; a single complete rinse often takes 6 to 12 hours.

[0005] Drying and heating restart time After rinsing, a large amount of moisture remains inside the air preheater. If it is ignited directly, it will lead to: accelerated low-temperature corrosion (especially at the cold end); water in the flue gas affecting the subsequent dust removal and desulfurization systems; and overload or abnormal vibration of the induced draft fan. Therefore, hot air drying or preheating of the heater is required, which takes several hours. Afterward, the temperature and pressure need to be increased slowly according to the procedure to avoid excessive thermal stress on the boiler's pressure-bearing components. The entire restart process may take another 12 to 24 hours.

[0006] Analysis of the reasons for high fuel consumption The start-up and shutdown process itself consumes a lot of energy. Cold start of boiler requires a large amount of fuel oil or gas for combustion (especially under the condition of no adjacent boiler heating); a typical cold start of a 300MW unit can consume 20 to 50 tons of fuel oil; even hot start requires additional coal to maintain the heating rate.

[0007] During start-up and shutdown, the boiler operates at low load for extended periods, resulting in thermal efficiency far below design values ​​(potentially as low as 30% to 40%). Auxiliary equipment (such as fans and water pumps) continues to operate at high power, increasing plant power consumption and leading to a significant increase in overall coal consumption.

[0008] High opportunity cost During shutdowns, power generation is impossible, resulting in lost electricity sales revenue; in electricity spot markets or regions with frequent peak shaving, shutdowns for cleaning may lead to penalties for breach of contract or dispatch assessments; to make up for lost electricity, subsequent operation often requires overload, further exacerbating equipment wear and fuel consumption.

[0009] Derivative issues Limited cleaning frequency: Due to the high cost of shutdown, power plants often "delay cleaning as much as possible," resulting in the air preheater operating with defects for a long time, the differential pressure continuously rising, and eventually being forced to shut down unplanned; Accumulated corrosion risk: Ammonium bisulfate that is not removed in time forms an acidic liquid film in a humid environment, accelerating cold-end corrosion; Deterioration of environmental indicators: Air preheater blockage causes the power consumption of the forced draft / induced draft fans to soar, indirectly increasing carbon emissions; at the same time, it may affect the uniformity of ammonia injection for denitrification, causing NOx emissions to exceed the standard. Utility Model Content

[0010] To address the shortcomings of existing technologies, this utility model provides a multi-functional spray flushing device for boiler air preheaters. A motor drives a rack and pinion to move the cleaning pipe back and forth, using 80-90℃ well water to flush the cold end of the air preheater without shutting down the machine. PLC frequency conversion control enables precise and efficient cleaning, solving the problems of common offline high-pressure water flushing requiring 24-72 hours of downtime, long cooling, flushing, and drying times, high fuel consumption during start-up and shutdown, impacting power generation revenue and exacerbating corrosion and emission risks.

[0011] To achieve the above objectives, this utility model provides the following technical solution: a multi-functional spray flushing device for a boiler air preheater, comprising an air preheater cold end body; and a top plate installed on the upper surface of the air preheater cold end body, with a base frame seat at the upper end of the top plate, and a pipe frame consisting of pipes installed on the base frame seat, with a fixing plate fixed along the length direction at the upper end of the pipe frame, and a rack on the upper surface of the fixing plate, with two sliding rods arranged parallel to each other on the inner side of the pipe frame, and sliding blocks slidably connected to the sliding rods, with support plates respectively connected to the outer sides of the two sliding blocks, and two connecting plates fixed at the upper end of the two support plates, with a cleaning pipe installed between the two connecting plates, and a cleaning head and one end of a conveying telescopic pipe installed on the surface of the cleaning pipe, the other end of the conveying telescopic pipe being connected to the water supply pipe of the pipe frame; A motor is installed on the front connecting plate, and the output end of the motor is connected to a drive gear that meshes with the front rack. A driven gear that meshes with the rear rack is rotatably connected to the rear connecting plate. The motor drives the drive gear to roll along the rack, which in turn drives the cleaning pipe to move back and forth along the diameter of the air preheater to achieve online spraying and flushing. The flushing water source introduced by the water supply pipe on the pipe rack is hot water with a temperature between 80℃ and 90℃, which is the boiler's second-phase fixed discharge well water, used to effectively dissolve the deposits and blockages in the air preheater, which are mainly composed of ammonium bisulfate.

[0012] Furthermore, the cleaning head is a fan-shaped spray nozzle with a spray angle of 100° to 130° and an aperture of 1.2mm to 1.8mm, used to ensure uniform coverage of the heat exchange element surface of the air preheater without any cleaning dead corners.

[0013] Furthermore, the conveying telescopic pipe is a high-temperature resistant stainless steel braided high-pressure hose with a working pressure of not less than 6MPa, and is equipped with an external telescopic steel protective sleeve to ensure stable water supply and prevent damage during the reciprocating motion of the cleaning pipe.

[0014] Furthermore, a linear slide rail structure is provided between the slide rod and the sliding block to reduce frictional resistance and improve the smoothness and positioning accuracy of the reciprocating motion of the cleaning tube.

[0015] Furthermore, the cleaning pipe is equipped with multiple cleaning heads spaced apart along its axial direction. The spray direction of each cleaning head is directed toward the heat exchange channel inlet of the cold end body of the air preheater, which is used for synchronous and efficient flushing of the entire cross-sectional area.

[0016] Furthermore, the motor is a variable frequency speed control type and equipped with a PLC control system, which can automatically adjust the moving speed, step distance and dwell time in critical areas of the cleaning pipe according to the degree of air preheater blockage.

[0017] Furthermore, the pipe rack is welded from seamless 304 stainless steel pipes. The inside of the pipe rack serves as a flushing water header, while the outside serves as a mechanical support structure, combining the functions of water delivery and load bearing.

[0018] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. The cleaning pipe is moved back and forth along the diameter of the air preheater by a gear rack structure driven by a motor. With the help of 80-90℃ constant discharge well water (the temperature range is preferably the constant discharge well water of the second phase of the boiler), the cold end heat exchange elements are fully flushed. The temperature of this hot water can effectively dissolve the deposits and blockages, mainly ammonium bisulfate (experimental data shows that the solubility of ammonium bisulfate can reach 28g / 100mL at 80℃). The cleaning operation can be completed without stopping the machine, reducing downtime per year, extending the full-load operation cycle of the air preheater by more than 6 months, improving heat exchange efficiency and reducing fuel consumption after cleaning. 2. The pipe rack is welded from seamless 304 stainless steel pipes, serving both water supply and load-bearing functions. Internally, it acts as a flushing water header, while externally, it provides mechanical support. It is corrosion-resistant and has strong pressure resistance (working pressure ≥6MPa). The cleaning pipe achieves smooth reciprocating movement through a double-slide rod guide and linear slide rail structure, preventing swaying and jamming. The conveying telescopic pipe uses high-temperature resistant stainless steel braided hose with a steel protective sleeve to ensure reliable long-term mobile liquid supply. Combined with a PLC-controlled variable frequency motor, the cleaning pipe's moving speed (0.1–1.0m / min), step distance (5–20cm), and residence time (5–60s) can be automatically adjusted according to the degree of air preheater blockage, enabling on-demand cleaning, reducing equipment wear and extending service life, while also reducing manual intervention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial three-dimensional structural diagram of the present utility model; Figure 3 This is a three-dimensional structural diagram of the location of the pipe rack of this utility model; Figure 4 This is a three-dimensional structural diagram showing the disassembled location of the pipe rack of this utility model; Figure 5 This is a three-dimensional structural diagram of the location of the cleaning tube in this utility model.

[0020] In the diagram: 1. Air preheater cold end body; 2. Top plate; 3. Base frame; 4. Pipe rack; 5. Fixing plate; 6. Rack; 7. Slide rod; 8. Sliding block; 9. Support plate; 10. Connecting plate; 11. Cleaning pipe; 12. Cleaning head; 15. Motor; 16. Drive gear; 17. Driven gear; 18. Conveying telescopic pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-5 The multi-functional spray flushing device for the boiler air preheater in this embodiment includes an air preheater cold end body 1; it also includes a top plate 2 installed on the upper end face of the air preheater cold end body 1, a base frame 3 is provided on the upper end of the top plate 2, a pipe frame 4 composed of pipes is installed on the base frame 3, a fixing plate 5 is fixed on the upper end of the pipe frame 4 along the length direction, a rack 6 is provided on the upper end face of the fixing plate 5, two sliding rods 7 are arranged parallel to each other on the inner side of the pipe frame 4, sliding blocks 8 are slidably connected on the sliding rods 7, support plates 9 are respectively connected to the outer sides of the two sliding blocks 8, two connecting plates 10 are fixed on the upper end of the two support plates 9, a cleaning pipe 11 is erected between the two connecting plates 10, a cleaning head 12 and one end of a conveying telescopic pipe 18 are installed on the surface of the cleaning pipe 11, and the other end of the conveying telescopic pipe 18 is connected to the water supply pipe of the pipe frame 4.

[0023] In this embodiment, the motor 15 drives the rack and pinion 6 to move the cleaning pipe 11 back and forth along the diameter of the air preheater. Combined with the 80-90℃ boiler secondary blowdown well water (i.e., high-temperature condensate discharged from the boiler's periodic blowdown system at 80-90℃), the cold-end heat exchange elements are fully flushed, effectively dissolving the blockages, primarily ammonium bisulfate. This achieves non-stop cleaning, reducing annual downtime by approximately 240 hours, extending the full-load operation cycle by more than 6 months, and improving heat exchange efficiency by 10%-15%. The pipe rack 4 adopts a 3... 04 Stainless steel seamless steel pipe welding, which serves as both a water supply main pipe and a mechanical support function (pressure bearing ≥6MPa). The cleaning pipe 11 is guided by double slide rods 7 and runs smoothly on a linear slide rail. The conveying telescopic pipe 18 is a high-temperature resistant stainless steel braided hose with a steel protective sleeve. Combined with the PLC-controlled variable frequency motor 15, it can automatically adjust the moving speed (0.1–1.0m / min), step distance (5–20cm), and residence time (5–60s) according to the degree of blockage, so as to achieve precise cleaning on demand and reduce equipment wear and manual intervention.

[0024] Please see Figures 1-5In this embodiment, in order to avoid downtime and reduce fuel consumption, a motor 15 is installed on the front connecting plate 10. The output end of the motor 15 is connected to a drive gear 16 that meshes with the front rack 6. A driven gear 17 that meshes with the rear rack 6 is rotatably connected to the rear connecting plate 10. The drive gear 16 is driven by the motor 15 to roll along the rack 6, which drives the cleaning pipe 11 to move back and forth along the diameter of the air preheater to achieve online spraying and rinsing. The flushing water source introduced by the water supply pipe on the pipe rack 4 is hot water with a temperature between 80°C and 90°C, which is the boiler phase II fixed discharge well water, used to effectively dissolve the deposits and blockages in the air preheater, mainly ammonium bisulfate.

[0025] In this embodiment, the motor 15 is mounted on the front connecting plate 10 to provide driving force. Its output end is connected to the drive gear 16, which meshes with the front rack 6. The rear connecting plate 10 is provided with a driven gear 17, which meshes with the rear rack 6. The motor 15 drives the drive gear 16 to roll along the rack 6, thereby driving the cleaning pipe 11 to move back and forth along the diameter of the air preheater, realizing online spraying and flushing without stopping the machine. This effectively saves downtime and reduces fuel consumption caused by ash accumulation. The flushing water used for the cleaning pipe 11 comes from the water supply pipe on the pipe rack 4. The water source is the boiler phase II constant discharge well water with a temperature of 80 to 90 degrees Celsius, which can efficiently dissolve the deposits and blockages in the air preheater, mainly ammonium bisulfate, significantly improving heat exchange efficiency and extending the continuous operation cycle of the equipment.

[0026] It should be noted that the cleaning head 12 is a fan-shaped spray nozzle with a spray angle of 100° to 130° and an aperture of 1.2mm to 1.8mm. It is used to ensure uniform coverage of the heat exchange element surface of the air preheater without any cleaning dead corners. The conveying telescopic pipe 18 is a high-temperature resistant stainless steel braided high-pressure hose with a working pressure of not less than 6MPa. It is equipped with an external telescopic steel protective sleeve to ensure stable water supply and prevent damage during the reciprocating motion of the cleaning pipe 11. The pipe frame 4 is welded from 304 stainless steel seamless steel pipe. The inside serves as a flushing water main pipe for stable hot water delivery, while the outside serves as a mechanical support structure to bear the load of the cleaning components. It has both water delivery and load-bearing functions, effectively improving the overall strength and corrosion resistance of the device. A linear slide rail structure is provided between the slide rod 7 and the sliding block 8, which can reduce the frictional resistance of the movement, improve the smoothness and positioning accuracy of the reciprocating movement of the cleaning pipe 11, ensure long-term reliable operation, and reduce maintenance requirements.

[0027] Please see Figures 1-5In this embodiment, the pipe frame 4 is made of 304 stainless steel seamless steel pipe, which can both transport water and bear weight. The pipe frame 4 in this embodiment is welded from 304 stainless steel seamless steel pipe. The inside of the pipe frame 4 is used as a flushing water main pipe, and the outside is used as a mechanical support structure, which has the dual functions of water transport and load bearing. A linear slide rail structure is provided between the slide rod 7 and the slide block 8 to reduce frictional resistance and improve the smoothness and positioning accuracy of the reciprocating motion of the cleaning pipe 11.

[0028] In this embodiment, the pipe frame 4 is welded from seamless 304 stainless steel pipes. The inside serves as a flushing water main pipe to achieve stable water supply, while the outside serves as a support structure to bear mechanical loads. It has both water conveyance and load-bearing functions, effectively improving corrosion resistance and structural reliability. The slide rod 7 and the sliding block 8 are combined with a linear slide rail structure to reduce motion friction resistance, improve the smoothness and positioning accuracy of the reciprocating movement of the cleaning pipe 11, ensure smooth long-term operation, and reduce maintenance frequency.

[0029] It should be noted that the cleaning pipe 11 is provided with multiple cleaning heads 12 at intervals along its axial direction. The spray direction of each cleaning head 12 is towards the heat exchange channel inlet of the cold end body 1 of the air preheater, which is used for synchronous and efficient flushing of the entire cross-sectional area. The motor 15 is a variable frequency speed control type and is equipped with a PLC control system, which can automatically adjust the moving speed, step distance and residence time in the critical area of ​​the cleaning pipe 11 according to the degree of air preheater blockage.

[0030] The working principle of the above embodiments is as follows: During use and operation, boiler phase II constant discharge well water with a temperature of 80 to 90 degrees Celsius is first introduced through the flushing water header inside the pipe frame 4. This hot water is stably transported to the cleaning pipe 11 through the conveying telescopic pipe 18. Multiple fan-shaped spray cleaning heads 12 are arranged axially along the cleaning pipe 11, with a spray angle of 100 to 130 degrees and an aperture of 1.2 to 1.8 mm, to ensure uniform coverage of the surface of the cold end heat exchange element of the air preheater without any cleaning dead corners. Subsequently, the variable frequency speed control motor 15 installed on the front connecting plate 10 starts, and its output end drives the drive gear 16 to rotate. The drive gear 16 meshes with the front rack 6, and at the same time, the driven gear 17 on the rear connecting plate 10 meshes with the rear rack 6, forming a double-sided synchronous drive structure, so that the entire cleaning pipe 11 moves smoothly back and forth along the diameter direction of the air preheater under the guidance of the linear slide rail composed of the slide rod 7 and the sliding block 8. During the movement, the PLC control unit automatically adjusts the speed of motor 15 according to the actual degree of blockage in the air preheater, thereby precisely controlling the moving speed, stepping distance and dwell time of the cleaning pipe 11 in key areas to achieve on-demand cleaning. High-temperature hot water is continuously sprayed out through the cleaning head 12, effectively dissolving the deposits and blockages, mainly composed of ammonium bisulfate. The cleaned dirt is discharged with the flue gas or drainage path. The entire process does not require shutdown, ensuring continuous and efficient operation of the boiler. Because the pipe frame 4 is welded from seamless 304 stainless steel pipes, it serves as both a water supply channel and a mechanical load-bearing structure. The conveying telescopic pipe 18 is made of high-temperature resistant stainless steel braided high-pressure hose and equipped with a steel protective sleeve. It can maintain stable and reliable water supply during long-term reciprocating motion, ensuring smooth operation of the whole machine, low maintenance frequency, significantly extending the full-load operation cycle of the air preheater, improving heat exchange efficiency, reducing downtime every year, and lowering fuel consumption.

[0031] It should be noted that the control method of this utility model is controlled by a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The power supply is also common knowledge in the field. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail here.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multifunctional spray washing device for a boiler air preheater, comprising an air preheater cold end body (1); characterized in that: It also includes a top plate (2) installed on the upper surface of the cold end body (1) of the air preheater. A base frame (3) is provided on the upper end of the top plate (2). A pipe frame (4) made of pipes is installed on the base frame (3). A fixing plate (5) is fixed on the upper end of the pipe frame (4) along the length direction. A rack (6) is provided on the upper surface of the fixing plate (5). Two sliding rods (7) are arranged parallel to each other on the inner side of the pipe frame (4). A sliding block (8) is slidably connected on the sliding rod (7). A support plate (9) is connected to the outer side of the two sliding blocks (8). Two connecting plates (10) are fixed on the upper end of the two support plates (9). A cleaning pipe (11) is installed between the two connecting plates (10). A cleaning head (12) and one end of a conveying telescopic pipe (18) are installed on the surface of the cleaning pipe (11). The other end of the conveying telescopic pipe (18) is connected to the water supply pipe of the pipe frame (4). A motor (15) is installed on the front connecting plate (10). The output end of the motor (15) is connected to the drive gear (16) that meshes with the front rack (6). The rear connecting plate (10) is rotatably connected to the driven gear (17) that meshes with the rear rack (6). The drive gear (16) is driven by the motor (15) to roll along the rack (6), which drives the cleaning pipe (11) to move back and forth along the diameter of the air preheater to achieve online spraying and rinsing. The flushing water source introduced by the water supply pipe on the pipe rack (4) is hot water with a temperature between 80°C and 90°C. It is the boiler phase II fixed discharge well water, which is used to effectively dissolve the deposits and blockages in the air preheater, which are mainly composed of ammonium bisulfate.

2. The multi-functional spray flushing device for boiler air preheaters according to claim 1, characterized in that: The cleaning head (12) is a fan-shaped spray nozzle with a spray angle of 100° to 130° and an aperture of 1.2 mm to 1.8 mm, used to ensure uniform coverage of the heat exchange element surface of the air preheater without cleaning dead corners.

3. The multi-functional spray flushing device for boiler air preheater according to claim 1, characterized in that: The conveying telescopic pipe (18) is a high-temperature resistant stainless steel braided high-pressure hose with a working pressure of not less than 6MPa and an external telescopic steel protective sleeve to ensure stable water supply and prevent damage during the reciprocating motion of the cleaning pipe (11).

4. The multi-functional spray flushing device for boiler air preheater according to claim 1, characterized in that: A linear slide rail structure is provided between the slide rod (7) and the sliding block (8) to reduce frictional resistance and improve the smoothness and positioning accuracy of the reciprocating motion of the cleaning tube (11).

5. The multi-functional spray flushing device for boiler air preheater according to claim 1, characterized in that: The cleaning pipe (11) is provided with multiple cleaning heads (12) spaced apart along its axial direction. The spray direction of each cleaning head (12) is directed toward the heat exchange channel inlet of the cold end body (1) of the air preheater, which is used for synchronous and efficient flushing of the entire cross-sectional area.

6. The multi-functional spray flushing device for boiler air preheater according to claim 1, characterized in that: The motor (15) is a variable frequency speed control type and is equipped with a PLC control system, which can automatically adjust the moving speed, step distance and dwell time of the cleaning pipe (11) in the critical area according to the degree of blockage of the air preheater.

7. The multi-functional spray flushing device for boiler air preheater according to claim 1, characterized in that: The pipe frame (4) is made of seamless 304 stainless steel pipe. The inside of the pipe frame (4) is used as a flushing water main pipe, and the outside is used as a mechanical support structure, which has the dual functions of water supply and load bearing.

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