Laminated disc type soot blower, soot blowing system and self-cleaning method of soot blowing system
The stacked disc sootblower achieves efficient wide-area soot cleaning and intelligent anti-clogging through its double-layer disc structure and flow resistance difference design. It solves the clogging problem of boiler sootblowers in high-temperature and high-dust environments, and improves the safety and economy of boiler operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENHUA GUOHUA JIUJIANG POWER GENERATION CO LTD
- Filing Date
- 2025-11-21
- Publication Date
- 2026-04-17
AI Technical Summary
Existing boiler soot blowers are prone to nozzle clogging in high-temperature and high-dust environments, leading to reduced or even ineffective soot removal and failure to effectively remove accumulated ash. Furthermore, traditional soot blowing methods suffer from problems such as dead zones in soot removal, erosion damage, and high maintenance costs.
The stacked disc soot blower adopts a double-layer disc structure and flow resistance difference design to achieve efficient wide-area soot cleaning and intelligent anti-clogging. By utilizing the design that the flow resistance of the upper soot blowing hole is greater than that of the lower hole, the airflow path is automatically switched when clogging occurs, thus achieving a self-cleaning function.
It achieves wide-area ash removal without dead corners or erosion, reduces maintenance costs, improves the safety and economy of boiler operation, and has self-cleaning capabilities, avoiding equipment failure caused by blockage.
Smart Images
Figure CN121876451A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of boiler soot blowing technology, and more specifically, to a stacked disc soot blower, a soot blowing system, and a self-cleaning method for the soot blowing system. Background Technology
[0002] Currently, existing soot removal technologies for horizontal flues and flame deflectors in boilers mostly employ sonic soot blowing, shock wave soot blowing, or steam / compressed air soot blowing. While these methods are widely used, each has significant drawbacks. Sonic soot blowing, with its gentle force, is insufficient to remove hardened, compacted ash and creates blind spots. Shock wave soot blowing, while powerful, carries the risk of impact damage to the flue lining and heat exchange tube bundles, and is accompanied by noise and safety hazards. Traditional steam or compressed air soot blowing is the most common, but relying on concentrated high-speed jets limits the cleaning range, easily creating blind spots in complex flue structures. Furthermore, the high-speed airflow can severely erode and wear down the equipment lining, resulting in high maintenance costs. More commonly, under harsh conditions of high temperature and high dust, the nozzles of these sootblowers are easily clogged by settled ash in the flue gas, leading to a sharp decline in cleaning efficiency or even failure. This not only fails to effectively remove ash but also increases the equipment maintenance burden due to its own blockage. Therefore, there is an urgent need for a soot blowing device that can achieve wide coverage, is erosion-free, and has anti-clogging and self-cleaning capabilities in extreme environments, in order to ensure the safety and economy of boiler operation. Summary of the Invention
[0003] This application aims to at least solve the technical problem in the related technology that, under harsh working conditions of high temperature and high dust, the nozzles of traditional soot blowers are easily blocked by settled ash in the flue gas, resulting in a sharp decline or even failure of the soot blowing efficiency and the inability to effectively remove accumulated ash.
[0004] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, this application provides a stacked disc sootblower, comprising: a base plate with mounting holes; an air guide pipe, one end of which passes through and is fixed to the center of the base plate; a lower sootblowing disc, which covers the base plate and encloses the base plate to form a lower chamber, wherein a plurality of lower sootblowing holes communicating with the lower chamber are evenly opened in the circumferential direction of the lower sootblowing disc; and an upper sootblowing disc, which covers the lower sootblowing disc and encloses the lower sootblowing disc to form an upper chamber, wherein a plurality of upper sootblowing holes communicating with the upper chamber are evenly opened in the circumferential direction of the upper sootblowing disc; wherein the flow resistance of the upper sootblowing holes is greater than that of the lower sootblowing holes, and the outlet end of the air guide pipe is sequentially connected to the upper chamber and the lower chamber.
[0005] This application provides a stacked disc sootblower that achieves both efficient wide-area cleaning and intelligent anti-clogging functions through the synergistic effect of a unique double-layer disc structure and a flow resistance difference self-cleaning method. In the efficient wide-area cleaning scenario, compressed air first enters the upper chamber through the air duct, then diffuses to the lower chamber, and is ejected in multiple directions as a diffuse high-speed airflow through two circumferentially evenly distributed Laval sootblowing holes. This design transforms the traditional destructive concentrated jet into a uniformly covered diffused airflow field, effectively entraining and lifting accumulated ash to be discharged with the flue gas while completely avoiding erosion damage to the flue lining. In the intelligent anti-clogging self-cleaning scenario, this application creatively adopts a setting where the flow resistance of the upper sootblowing hole is greater than that of the lower sootblowing hole. When the sootblower is not in operation, if dust clogs the lower sootblowing hole with lower flow resistance, upon the next startup, the flow resistance of the lower channel increases sharply due to blockage, forcing the airflow to preferentially exit from the upper sootblowing hole with relatively lower flow resistance. The airflow ejected from the upper hole creates a strong suction effect inside the sootblower, as if it has been "blown away" inside. This effectively removes the dust accumulated in the lower chamber and the lower sootblowing hole until the lower hole is clear, thus achieving self-cleaning of the sootblower and fundamentally solving the clogging problem.
[0006] Secondly, this application proposes a soot blowing system, comprising: a high-pressure driving air source; an air supply header connected to the high-pressure driving air source; a control device for controlling the start and stop of the high-pressure driving air source and the air supply parameters; and multiple stacked disc soot blowers as described above, wherein each stacked disc soot blower is connected in parallel through the air supply header.
[0007] The soot blowing system provided in this application includes the stacked disc soot blower of the above-mentioned scheme, and therefore has all the beneficial effects of the stacked disc soot blower, which will not be repeated here.
[0008] Thirdly, this application proposes a self-cleaning method for a soot blowing system, used in the soot blowing system of the above-mentioned technical solution. The self-cleaning method of the soot blowing system includes the following steps: S1, when the lower soot blowing hole is blocked by accumulated ash in the non-working state of the stacked disc soot blower, the high-pressure driving air source is started; S2, the airflow enters the upper chamber and the lower chamber through the air guide pipe. Due to the increased flow resistance of the lower soot blowing hole, the airflow is preferentially ejected from the upper soot blowing hole; S3, the airflow ejected from the upper soot blowing hole is entrained and removed from the stacked disc soot blower inside the lower chamber and the lower soot blowing hole until the lower soot blowing hole is unobstructed.
[0009] The self-cleaning method for the soot blowing system provided in this application, being used in the soot blowing system described above, possesses all the beneficial effects of the soot blowing system, which will not be elaborated further here.
[0010] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description
[0011] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is one of the structural schematic diagrams of a stacked disc sootblower according to an embodiment of this application; Figure 2 This is a second schematic diagram of the structure of a stacked disc sootblower according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a soot blowing system according to an embodiment of this application; Figure 4 This is a flowchart of a self-cleaning method for a soot blowing system according to an embodiment of this application; Figure 5 This is a single-blow flowchart of a self-cleaning method for a soot blowing system according to an embodiment of this application; Figure 6 This is a flowchart illustrating the programmed soot blowing process of a self-cleaning method for a soot blowing system according to an embodiment of this application.
[0012] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100 Stacked disc soot blower, 110 base plate, 112 mounting hole, 120 air guide pipe, 130 lower soot blowing disc, 132 lower chamber, 134 lower soot blowing hole, 140 upper soot blowing disc, 142 upper chamber, 144 upper soot blowing hole, 150 sonic wave generator, 200 soot blowing system, 210 high-pressure drive air source, 220 air supply main pipe, 230 control device. Detailed Implementation
[0013] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0014] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.
[0015] The following reference Figures 1 to 6 This application describes a stacked disc sootblower 100, a sootblowing system 200, and a self-cleaning method for the sootblowing system provided according to some embodiments of the present application.
[0016] According to the first aspect of this application, Figure 1 and Figure 2As shown, one embodiment of this application provides a stacked disc sootblower 100, comprising: a base 110 with mounting holes 112; an air guide pipe 120, one end of which passes through and is fixed to the center of the base 110; and a lower sootblowing disc 130, which covers the base 110 and forms a lower chamber 132 with the base 110, wherein a plurality of communicating lower chambers 132 are evenly distributed around the lower sootblowing disc 130. The upper layer blowing hole 134 is a lower layer blowing plate 140. The upper layer blowing plate 140 covers the lower layer blowing plate 130 and together with the lower layer blowing plate 130 forms an upper layer chamber 142. The upper layer blowing plate 140 has a plurality of upper layer blowing holes 144 evenly opened in the circumferential direction to connect with the upper layer chamber 142. The flow resistance of the upper layer blowing hole 144 is greater than that of the lower layer blowing hole 134. The air outlet end of the air guide pipe 120 is connected to the upper layer chamber 142 and the lower layer chamber 132 in sequence.
[0017] Specifically, such as Figure 1 and Figure 2 As shown, the stacked disc sootblower 100 provided in the embodiments of this application includes a base 110, an air guide pipe 120, a lower sootblowing disc 130, and an upper sootblowing disc 140. The base 110 has mounting holes 112; one end of the air guide pipe 120 passes through and is fixed to the center of the base 110; the lower sootblowing disc 130 covers the base 110 and forms a lower chamber 132 with the base 110; a plurality of lower sootblowing holes 134 communicating with the lower chamber 132 are evenly opened on the circumference of the lower sootblowing disc 130; the upper sootblowing disc 140 covers the lower sootblowing disc 130 and forms an upper chamber 142 with the upper sootblowing disc 130; a plurality of upper sootblowing holes 144 communicating with the upper chamber 142 are evenly opened on the circumference of the upper sootblowing disc 140. The upper soot blowing hole 144 has a greater flow resistance than the lower soot blowing hole 134, and the outlet of the air duct 120 is connected to the upper chamber 142 and the lower chamber 132 in sequence.
[0018] In this way, after the compressed air is introduced through the air guide pipe 120, it first enters the upper chamber 142. Due to the greater flow resistance design of the upper soot blowing hole 144 than the lower soot blowing hole 134, under normal operating conditions, most of the airflow will preferentially be ejected through the lower soot blowing hole 134 with lower flow resistance, forming a multi-stream diffusion jet with a wide coverage and moderate impact force, effectively removing ash from the heated surface. The unique double-layer disc structure disperses the concentrated airflow into jets in multiple directions, avoiding the erosion of the flue lining by local high-speed impacts. More importantly, when the lower soot blowing hole 134 becomes blocked by ash accumulation, causing its flow resistance to increase to exceed that of the upper soot blowing hole 144, the main airflow path is intelligently switched, and the compressed air is ejected from the upper soot blowing hole 144. Utilizing the entrainment effect generated inside the sootblower when it is ejected, the accumulated dust inside is automatically removed until the lower hole is cleared, thereby realizing the self-cleaning function of the sootblower and fundamentally solving the technical problem of easy clogging of sootblowers in high-temperature and high-dust environments.
[0019] Compared with existing technologies, the advantages of the stacked disc sootblower 100 provided in this application are as follows: First, through the double-layer disc structure and the design of circumferentially distributed sootblowing holes, the concentrated jet is transformed into a comprehensive diffusion airflow field, ensuring thorough cleaning without dead angles and avoiding erosion damage to the equipment; Second, by utilizing the flow resistance difference design of the upper and lower sootblowing holes, intelligent sensing of the sootblower's blockage status and adaptive switching of the airflow path are achieved, giving it outstanding self-cleaning capabilities; Third, the self-cleaning process is driven by the sootblower's own airflow, requiring no additional power source or complex control, resulting in a simple structure, high reliability, and effectively reducing maintenance costs and failure rates; Fourth, the overall structure is compact and made of high-temperature resistant materials, making it particularly suitable for boiler horizontal flues, flame deflectors, and other space-constrained and harsh environmental conditions, significantly improving the safety and economy of boiler operation.
[0020] Specifically, existing soot removal technologies for horizontal flues and flame deflectors in boilers mostly employ sonic soot blowing, shock wave soot blowing, or steam / compressed air soot blowing. While these methods are widely used, each has significant drawbacks. Sonic soot blowing, with its gentle force, is insufficient to remove hardened, compacted ash and creates blind spots. Shock wave soot blowing, while powerful, carries the risk of impact damage to the flue lining and heat exchange tube bundles, and is accompanied by noise and safety hazards. Traditional steam or compressed air soot blowing is the most common, but relying on concentrated high-speed jets limits the cleaning range, easily creating blind spots in complex flue structures. Furthermore, the high-speed airflow can severely erode and wear down the equipment lining, resulting in high maintenance costs. More commonly, under harsh conditions of high temperature and high dust, the nozzles of these sootblowers are easily clogged by settled ash in the flue gas, leading to a sharp decline in cleaning efficiency or even failure. Not only do they fail to effectively remove ash, but the clogging itself increases the equipment maintenance burden. Therefore, there is an urgent need for a soot blowing device that can achieve wide coverage, is erosion-free, and has anti-clogging and self-cleaning capabilities in extreme environments, in order to ensure the safety and economy of boiler operation.
[0021] To address the shortcomings of existing technologies, such as Figure 1 and Figure 2 As shown, the stacked disc sootblower 100 provided in this application achieves the dual functions of efficient wide-area soot blowing and intelligent anti-clogging through the synergistic effect of a unique double-layer disc structure and a flow resistance difference self-cleaning mechanism. In the efficient wide-area soot blowing scenario, compressed air first enters the upper chamber 142 through the air guide pipe 120, then diffuses to the lower chamber 132, and is ejected in multiple directions through the circumferentially evenly distributed upper and lower Laval soot blowing holes. This design transforms the traditional destructive concentrated jet into a uniformly covered diffused airflow field, effectively entraining and lifting accumulated ash to be discharged with the flue gas while completely avoiding erosion damage to the flue lining. In the intelligent anti-clogging self-cleaning scenario, this application creatively adopts a setting where the flow resistance of the upper soot blowing hole 144 is greater than that of the lower soot blowing hole 134. When the sootblower is not in operation, if dust clogs the lower sootblowing hole 134 with lower flow resistance, the flow resistance of the lower channel will increase sharply upon the next startup due to the blockage. This forces the airflow to preferentially exit from the upper sootblowing hole 144, where the flow resistance is relatively lower. The airflow exiting from the upper hole creates a strong entrainment effect inside the sootblower, effectively "sweeping" the interior and removing the accumulated dust in the lower chamber 132 and the lower sootblowing hole 134 until the lower hole is unobstructed. This achieves self-cleaning of the sootblower and fundamentally solves the clogging problem.
[0022] In some embodiments, optionally, such as Figure 1 As shown, it also includes a sound wave generator 150, which is disposed in the airflow direction of the air duct 120 and is used to generate sound wave oscillations.
[0023] Specifically, such as Figure 1 As shown, the acoustic wave generator 150 is connected in series in the air duct 120. Its interior typically contains a diaphragm and resonant cavity structure that generate self-excited oscillations under airflow. When compressed air, acting as a power source, flows through the acoustic wave generator 150, it drives the diaphragm to vibrate and resonates within the resonant cavity, thereby converting the potential energy of the compressed air into low-frequency, high-energy sound waves. This sound wave energy enters the chamber of the sootblower along with the main airflow and radiates outward through the sootblowing holes. By adding the acoustic wave generator 150, airflow purging and acoustic cleaning are combined. The outwardly radiated sound waves can break down the binding force between ash particles and the pipe wall, as well as between ash particles, loosening the hardened, compacted ash. Subsequently, the airflow ejected from the sootblowing holes can more easily carry away the loosened ash, thus significantly improving the removal efficiency of stubborn ash and achieving a synergistic cleaning effect of "acoustic loosening and airflow purging."
[0024] In some embodiments, the chassis 110, the air duct 120, the lower soot blowing disc 130, and the upper soot blowing disc 140 are optionally made of high-temperature resistant alloy materials.
[0025] Specifically, the high-temperature alloy material can be selected from nickel-based, cobalt-based, or iron-based high-temperature alloys. Due to the extremely harsh operating conditions in the boiler's horizontal flue and flame deflector area, the flue gas temperature typically operates between 800℃ and 1000℃, and may even be higher for short periods, and the flue gas contains corrosive components. The core components of the sootblower, made from such special alloys, possess excellent high-temperature strength, resistance to high-temperature oxidation, and resistance to flue gas corrosion. They can maintain structural integrity, dimensional stability, and mechanical properties over a long period in this high-temperature environment, fundamentally avoiding equipment failure caused by material softening, deformation, or excessively rapid corrosion, thus ensuring the durability and operational reliability of the sootblower throughout the boiler's entire lifespan.
[0026] In specific applications, the heat resistance temperature of the high-temperature alloy material can be set to 1200℃. This can be set according to the actual usage conditions, and will not be elaborated here.
[0027] In some embodiments, optionally, such as Figure 1 As shown, there are 8 lower-layer soot blowing holes 134, with a cross-sectional size of 10mm×10mm, and they are evenly distributed in a 45° circumferential direction.
[0028] Specifically, such as Figure 1 As shown, eight lower-level blowing holes 134 are formed on the lower-level blowing disk 130. These eight holes are evenly distributed at 45-degree angles around the axis of the lower-level blowing disk 130, that is, the central angle between two adjacent blowing holes is 45 degrees. The flow cross-section of each lower-level blowing hole 134 is constructed as a 10mm × 10mm square structure. The circumferential uniform distribution of the eight holes ensures that the compressed air jet ejected from this layer can form a uniform purging force field covering 360 degrees horizontally without dead angles, greatly eliminating the cleaning blind zone. In addition, the specific cross-sectional size of 10mm × 10mm can provide sufficient flow area for the airflow to ensure the required volumetric flow rate under a given system pressure, while also generating a sufficiently high jet velocity, thereby effectively entraining and carrying away accumulated ash.
[0029] In some embodiments, optionally, such as Figure 1 and Figure 2 As shown, there are 8 upper-layer soot blowing holes 144, with a cross-sectional size of 10mm×5mm, and they are evenly distributed in a 45° circumferential direction.
[0030] Specifically, such as Figure 1As shown, the upper sootblowing disc 140 also has eight upper sootblowing holes 144. These eight holes correspond to the lower sootblowing holes 134 in a staggered manner, and are also circumferentially distributed at equal intervals at a 45-degree angle. The flow cross-section of each upper sootblowing hole 144 is designed as a flat rectangular structure of 10mm × 5mm. Compared with the lower sootblowing hole 134 with a cross-section of 10mm × 10mm, the upper sootblowing hole 144 has a 50% smaller cross-sectional area. According to the principles of fluid dynamics, under the same air intake conditions, its flow resistance is significantly greater than that of the lower layer. During normal soot blowing, the airflow preferentially exits from the lower holes with lower flow resistance to perform the main soot blowing task; when the lower holes are blocked, the system pressure increases, forcing the airflow to turn and exit from the upper holes with relatively lower flow resistance, thus achieving "back-blowing" cleaning of the internal ash accumulation. The uniform distribution of the eight upper holes ensures that the self-cleaning airflow can cover the entire interior of the sootblower, thereby efficiently and reliably restoring the patency of the lower holes.
[0031] In some embodiments, optionally, such as Figure 1 and Figure 2 As shown, both the lower soot blowing hole 134 and the upper soot blowing hole 144 are Laval nozzles.
[0032] Specifically, such as Figure 1 As shown, the channel structures of both the lower soot blowing hole 134 and the upper soot blowing hole 144 are constructed as Laval nozzles (i.e., variable cross-section flow channels that first contract and then expand). When compressed air flows through such nozzles, it reaches a critical state at its throat (the narrowest point), and the airflow velocity is accelerated to the speed of sound. Subsequently, in the expansion section, according to the characteristics of supersonic airflow, the velocity will further increase, and finally it will be ejected in the form of a supersonic jet. This can more effectively impact and entrain the caking ash on the heated surface of the smoke duct, significantly enhancing the soot removal capability. In addition, the supersonic flow characteristics of the Laval nozzle make its outlet airflow insensitive to external pressure fluctuations, with strong anti-interference ability and more stable operation.
[0033] In practical applications, the stacked disc sootblower 100 consists of two layers of sootblowing holes. The lower layer of sootblowing holes has eight Laval jet sootblowing flat holes, which spray sootblowing jets with compressed air in eight directions. The compressed air with a certain pressure and flow rate picks up the accumulated ash, disrupts the original settling equilibrium of the accumulated ash, and forces the accumulated ash into a turbulent state to flow away with the flow of flue gas, thereby achieving the purpose of removing the accumulated ash. The top layer of eight small sootblowing jets are anti-clogging sootblowing holes, with greater flow resistance than the bottom sootblowing holes. When the stacked sootblower is not in operation, settled ash in the flue gas will enter the sootblower through these holes. When settled ash clogs the top and bottom sootblowing holes (134), the pressure increases when the sootblower starts. Due to the increased flow resistance of the bottom sootblowing holes, the flow resistance of the top sootblowing holes decreases. At this time, compressed air is drawn into the sootblower from the top sootblowing holes and ejected, continuously cleaning the dust inside the sootblower until the bottom stacked sootblowing holes are cleared, thus achieving the purpose of self-cleaning the ash accumulation inside the sootblower. This design fully considers various operating conditions of the sootblower, and preliminary verification shows that the sootblowing effect is good.
[0034] In practical applications, the technical parameters of the stacked disc sootblower 100 are set as follows: Height: 75mm; Maximum diameter: 200mm; Airflow interface diameter: Φ68mm×7mm; Lower layer sootblowing holes: 8 jet holes with a cross-section of 10mm×10mm, evenly distributed at 45 degrees; Upper layer sootblowing holes: 8 jet holes with a cross-section of 10mm×5mm, evenly distributed at 45 degrees; Working pressure: 0.1MPa~0.5MPa; Flow rate: 3m³ / h 3 / min~10m 3 / min. Material: High temperature resistant alloy; High temperature resistance: 1200℃.
[0035] According to the second aspect of this application, such as Figure 3 As shown, an embodiment of this application also proposes a soot blowing system 200, including: a high-pressure driving air source 210; an air supply header 220 connected to the high-pressure driving air source 210; a control device 230 for controlling the start and stop of the high-pressure driving air source 210 and the air supply parameters; and multiple stacked disc soot blowers 100 as described above, wherein each stacked disc soot blower 100 is connected in parallel through the air supply header 220.
[0036] Specifically, the soot blowing system 200 includes a high-pressure drive air source 210, an air supply header 220, a control device 230, and multiple stacked disc soot blowers 100. The air supply header 220 is connected to the high-pressure drive air source 210, the control device 230 controls the start / stop of the high-pressure drive air source 210 and its air supply parameters, and the multiple stacked disc soot blowers 100 are connected in parallel via the air supply header 220.
[0037] In this way, multiple stacked disc sootblowers 100 are connected in parallel to the same high-pressure drive air source 210 and control device 230 through the air supply header 220, realizing an integrated sootblowing system 200 with centralized control and zoned operation. The advantages of this design are as follows: First, centralized air supply and unified control ensure the consistency of the operating parameters of all sootblowers, avoiding uneven sootblowing effects caused by pressure or flow fluctuations in individual sootblowers, and ensuring the stability and reliability of the overall sootblowing quality. Second, the parallel arrangement allows each sootblower to work independently, synchronously, or according to a preset program in different areas of the boiler flue (such as the flame deflector ramp and horizontal flue), achieving thorough and complete cleaning of complex structural spaces. Third, this integrated system fully leverages the dual advantages of efficient sootblowing and self-cleaning of individual stacked disc sootblowers 100, amplifying their efficiency to the system level, thereby significantly improving the cleanliness of the entire boiler heating surface, ultimately achieving the comprehensive benefits of improving boiler thermal efficiency, ensuring safe operation, and reducing maintenance costs.
[0038] In some embodiments, optionally, such as Figure 3 As shown, the stacked disc sootblower 100 is divided into two groups, each group including 6 stacked disc sootblower 100, which are symmetrically arranged on the left and right walls of the boiler horizontal flue.
[0039] Specifically, such as Figure 3 As shown, the 12 stacked disc sootblowers 100 in the sootblowing system 200 are divided into two independent sootblower groups. Each group contains 6 sootblowers, which are fixedly installed on the left and right walls of the boiler's horizontal flue in a symmetrical layout. The advantages of this double-sided symmetrical array arrangement are: First, it can form a three-dimensional purging area without dead angles in a horizontal flue that is typically more than 30 meters wide, through the cross-coverage of the jets from the sootblowers on both sides, ensuring that the accumulated ash in the center of the flue and the entire cross-sectional area can be effectively removed. Second, the symmetrical arrangement allows the interference of the airflow on both sides on the mainstream flue gas field in the flue to be balanced, avoiding the adverse effects of flue gas deflection and vortices that may be caused by unilateral purging, thus ensuring the stability of boiler operation. Third, this modular design with symmetrical groups makes it easy to implement differentiated blowing strategies (such as adjusting the blowing frequency or duration) on the left and right sootblower groups through the control device 230 according to the severity of dust accumulation on site, so as to achieve precise and efficient intelligent dust removal, thereby optimizing the energy consumption of compressed air while ensuring the best dust removal effect.
[0040] In practical applications, the soot blowing system 200 provided in this application adopts separate air intakes from the left and right side walls, with one main pipe on each side supplying six soot blowers, for a total of 12 soot blowers. The soot blowing medium is compressed air. A 3-cubic-meter air storage tank and a control box are installed on one side of the furnace. One set of stacked disc soot blowers 100 is installed on each of the left and right side walls. Taking the center of the 34-meter horizontal slope as the boundary, one set of soot blowers is installed on each of the left and right sides. Each set of soot blowers consists of six soot blowers, and the installation positions are as follows... Figure 3 As shown, the actual installation location can be adjusted appropriately based on the area of dust accumulation on site.
[0041] According to the third aspect of this application, such as Figure 4 As shown, the embodiments of this application also propose a self-cleaning method for a soot blowing system, used in the soot blowing system of the above embodiments. The self-cleaning method for the soot blowing system includes the following steps: S1, when the lower soot blowing hole is blocked by accumulated ash in the non-working state of the stacked disc soot blower, the high-pressure driving air source is started; S2, the airflow enters the upper chamber and the lower chamber through the air guide pipe. Due to the increased flow resistance of the lower soot blowing hole, the airflow preferentially exits from the upper soot blowing hole; S3, the airflow exiting the upper soot blowing hole is entrained and removed from the lower chamber and the lower soot blowing hole inside the stacked disc soot blower until the lower soot blowing hole is unobstructed.
[0042] Specifically, the self-cleaning method for a soot blowing system provided in this application includes the following steps: S1. When the lower layer soot blowing hole is blocked by accumulated ash while the stacked disc soot blower is not in operation, start the high-pressure drive air source. S2. The airflow enters the upper and lower chambers through the air guide tube. Due to the increased flow resistance of the lower soot blowing hole, the airflow is preferentially ejected from the upper soot blowing hole. S3. The airflow ejected from the upper soot blowing hole is drawn into and removes the accumulated dust in the lower chamber and the lower soot blowing hole inside the stacked disc soot blower until the lower soot blowing hole is unobstructed.
[0043] Specifically, such as Figure 4 As shown, in step S1, when the sootblower is not in operation, the dust in the boiler flue gas will naturally settle under gravity. Since the lower sootblower holes serve as the main airflow channel during normal operation, their openings are directly exposed to the flue environment, making them most susceptible to partial or complete blockage by settled ash. At this time, activating the high-pressure drive air source provides initial power for the self-cleaning process and establishes working pressure inside the sootblower.
[0044] In step S2, after the airflow exits the air guide pipe, it first fills the upper chamber and attempts to flow simultaneously to both the upper and lower soot blowing holes. Because the lower soot blowing holes are blocked by accumulated ash, their effective flow area is drastically reduced, resulting in a significant increase in flow resistance through this channel, potentially even exceeding the already high design resistance of the upper soot blowing holes. Based on the principle that fluids "prefer to flow along the path of least flow resistance," most of the compressed air will no longer attempt to clear the blocked lower holes, but will naturally change direction and be concentrated and ejected from the upper soot blowing holes. This process achieves fully automatic, passive switching of the airflow path.
[0045] In step S3, the high-speed airflow ejected from the upper sootblower creates a localized low-pressure zone (i.e., a suction effect) in the lower chamber behind it and at the blocked lower sootblower inlet as it leaves the sootblower body. This low-pressure zone generates a strong suction force, acting like a built-in "vacuum cleaner," continuously agitating, lifting, and entraining loose dust accumulated in the lower chamber and blocked in the lower sootblower into the main airflow, which is eventually discharged from the upper sootblower along with the airflow. This process continues, the blockage in the lower sootblower is continuously cleared, its effective flow area gradually recovers, and the flow resistance decreases accordingly. Until the flow resistance relationship between the upper and lower layers returns to the design state, the main airflow path automatically switches back to the lower sootblower, marking the completion of the self-cleaning process and the sootblower returning to normal operation. Thus, the self-cleaning method of this application utilizes the airflow generated by the sootblower itself during operation as the cleaning medium and, based on the simple physical flow resistance principle, achieves intelligent perception and autonomous repair of blockage faults. The entire process requires no external control components such as sensors or actuators, nor any manual intervention, demonstrating extremely high reliability and economy. It fundamentally solves the industry problem of sootblowers failing due to blockage under harsh operating conditions, ensuring the continuity and stability of the sootblowing system and boiler operation.
[0046] In some embodiments, optionally, such as Figure 5 and Figure 6 As shown, the control device supports single-point purging mode and cruise purging mode. Cruise purging mode includes cyclically starting each group of soot blowers in a preset order, with each group's purging time being T1, the purging cycle being T2, and the number of purging cycles being C.
[0047] Specifically, such as Figure 5 and Figure 6As shown, the control device has two preset operating modes to adapt to different dust removal needs. The single-point purging mode allows operators to manually select and start any specified single or group of sootblowers through the control interface. This mode is mainly used in specific scenarios such as equipment debugging, targeted intensive purging of severely dusty areas, or functional testing during maintenance, providing high operational flexibility. The cruise purging mode, on the other hand, is an automated, periodic dust removal method used during normal system operation. In this mode, the control device cyclically starts each group of sootblowers according to a preset logical sequence. Its control logic includes three key time parameters: single-group purging time T1, which refers to the duration of continuous operation of each group of sootblowers, ensuring sufficient time to effectively remove dust from the area; purging cycle T2, which refers to the time interval between completing one full system cycle purging and the start of the next cycle; and stage purging count C, which refers to the number of times the system executes the above cyclic sequence within a complete purging cycle. By rationally setting the three parameters T1, T2, and C, the actual operating conditions and ash accumulation characteristics of the boiler can be precisely matched, achieving fully automatic, intelligent, and most economical and efficient ash removal operations. This prevents insufficient ash removal and avoids energy waste and excessive equipment wear. The coordinated operation of these two modes gives the sootblowing system both the flexible ability to handle special situations and the fully automatic management capability to ensure long-term stable operation, greatly improving the system's practicality and intelligence.
[0048] The soot blowing system and its self-cleaning method proposed in this application, through the application of a stacked disc soot blower and its unique self-cleaning method, achieve effective online removal of ash accumulation in horizontal flues, especially in high-temperature reheating areas. On the one hand, this fundamentally alleviates the problem of high-temperature ash corrosion caused by ash accumulation, thus effectively ensuring the material strength and service life of high-temperature and high-temperature reheating pipes; on the other hand, it keeps the boiler heating surfaces clean, significantly improving heat transfer efficiency. This not only directly improves the boiler's thermal efficiency and reduces energy consumption, but also effectively reduces the weight of ash and slag carried by the furnace flame deflector, eliminating potential structural safety risks. Ultimately, this leads to increased equipment reliability and reduced maintenance costs.
[0049] In the description of this application, the term "multiple" refers to two or more. Unless otherwise expressly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0050] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0051] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A stacked disc soot blower, characterized in that, include: The chassis has mounting holes. An air duct, one end of which passes through and is fixed to the center of the chassis; The lower soot blowing disc is mounted on the base plate and forms a lower chamber with the base plate. The lower soot blowing disc has a plurality of lower soot blowing holes that are evenly opened in the circumference of the lower chamber. An upper soot blowing plate is placed on top of the lower soot blowing plate and together with the lower soot blowing plate to form an upper chamber. The upper soot blowing plate has a plurality of upper soot blowing holes that are evenly opened in the circumference of the upper soot blowing plate and communicate with the upper chamber. The upper soot blowing hole has a greater flow resistance than the lower soot blowing hole, and the outlet of the air guide pipe is connected to the upper chamber and the lower chamber in sequence.
2. The stacked disc soot blower according to claim 1, characterized in that, It also includes a sound wave generator, which is positioned in the airflow direction of the air duct to generate sound wave oscillations.
3. The stacked disc soot blower according to claim 1, characterized in that, The chassis, air duct, lower soot blowing plate, and upper soot blowing plate are all made of high-temperature resistant alloy material.
4. The stacked disc soot blower according to claim 1, characterized in that, The lower layer has 8 blowing holes, each with a cross-sectional dimension of 10mm × 10mm, and they are evenly distributed circumferentially at a 45° angle.
5. The stacked disc soot blower according to claim 1, characterized in that, The upper layer has 8 blowing holes with a cross-sectional size of 10mm × 5mm, which are evenly distributed in a 45° circumferential direction.
6. The stacked disc soot blower according to claim 1, characterized in that, Both the lower and upper air blowing holes are Laval nozzles.
7. A soot blowing system, characterized in that, include: High-pressure drive air source; The main gas supply pipe is connected to the high-pressure drive gas source; A control device is used to control the start / stop and gas supply parameters of the high-pressure drive gas source; Multiple stacked disc soot blowers as described in any one of claims 1 to 6, wherein each of the stacked disc soot blowers is connected in parallel via the air supply header.
8. The soot blowing system according to claim 7, characterized in that, The stacked disc sootblower is divided into two groups, each group including 6 stacked disc sootblowers, which are symmetrically arranged on the left and right walls of the boiler horizontal flue.
9. A self-cleaning method for a soot blowing system, characterized in that, For a soot blowing system as described in claim 7 or 8, the self-cleaning method of the soot blowing system includes the following steps: S1. When the lower layer soot blowing hole is blocked by accumulated ash while the stacked disc soot blower is not in operation, the high-pressure drive air source is activated. S2. The airflow enters the upper chamber and the lower chamber through the air guide pipe. Due to the increased flow resistance of the lower soot blowing hole, the airflow preferentially exits from the upper soot blowing hole. S3. The airflow ejected from the upper soot blowing hole is drawn into and removes the accumulated dust in the lower chamber and the lower soot blowing hole inside the stacked disc soot blower until the lower soot blowing hole is unobstructed.
10. The self-cleaning method for the soot blowing system according to claim 9, characterized in that, The control device supports single-point purging mode and cruise purging mode. The cruise purging mode includes cyclically starting each group of soot blowers in a preset order, with each group having a purging time of T1, a purging cycle of T2, and a stage purging count of C.