Limestone cleaning nozzle with self-cleaning structure and cleaning method thereof

Abstract

The application discloses a limestone cleaning nozzle with a self-cleaning structure and a cleaning method thereof, and belongs to the technical field of limestone nozzles. The nozzle comprises a nozzle main body, a main channel for conveying limestone slurry is arranged in the nozzle main body in an axial direction, at least one lateral flow channel is in communication with the main channel, and a self-cleaning unit is arranged in the lateral flow channel; the self-cleaning unit comprises a side temporary storage channel, one end of the side temporary storage channel is in communication with the main channel, and the other end of the side temporary storage channel is in communication with a temporary power member; the temporary power member has a cavity in the inside, a sliding partition plate is sealingly and slidably arranged in the cavity, the cavity is divided into a temporary storage cavity and a power cavity which are not in communication with each other, the temporary storage cavity is in communication with the side temporary storage channel, and the power cavity is in communication with the main channel through a side power channel.

Description

Technical Field

[0001] This invention belongs to the field of limestone nozzle technology, and relates to a limestone cleaning nozzle with a self-cleaning structure and its cleaning method. Background Technology

[0002] In flue gas desulfurization systems of coal-fired power plant boilers, the limestone-gypsum wet desulfurization process is widely used due to its mature technology, high desulfurization efficiency, and relatively controllable operating costs. The core principle of this process is to use limestone slurry as an absorbent, which reacts chemically with sulfur dioxide in the flue gas within the absorption tower to produce byproducts such as gypsum. During this process, the limestone slurry nozzle, as a key component for slurry atomization, uniformly and finely atomizes the limestone slurry and sprays it into the absorption tower to increase the gas-liquid contact area, thereby improving the mass transfer absorption efficiency of sulfur dioxide. The nozzle's atomization particle size, spray angle, and flow distribution directly determine the uniformity of mixing between the slurry and flue gas and the degree of reaction, thus affecting the overall operating efficiency and emission compliance of the desulfurization system. However, in actual industrial operating environments, limestone slurry is not a homogeneous and stable ideal fluid. The slurry typically contains incompletely ground coarse limestone particles, gypsum crystal particles, rust, gravel, and solid substances such as calcium sulfite and calcium sulfate precipitated due to slurry supersaturation. When these solid particles flow through the internal channels and orifices of the nozzle, they are prone to physical deposition or chemical scaling on the channel walls, vortex zones, or orifice outlets. Specifically, on the one hand, large-diameter solid particles become stuck and accumulate due to inertia in the nozzle constriction section or orifice inlet, forming deposition blockages; on the other hand, at the nozzle outlet, the slurry experiences a sudden pressure drop and water evaporation, leading to supersaturation and precipitation of dissolved salts, forming a hard scale layer at the orifice edge, gradually reducing the effective flow area of ​​the orifice. The superposition of these two blockage mechanisms results in nozzles commonly exhibiting phenomena such as decreased flow rate, uneven atomization, deflected spray direction, or even complete failure after a period of continuous operation.

[0003] Regarding the aforementioned nozzle clogging problem, currently available limestone slurry nozzles do not possess automatic unclogging capabilities. In engineering practice, operators typically rely on periodic inspections or, upon discovering a significant decrease in desulfurization efficiency, to shut down or bypass the absorption tower and manually disassemble the nozzles for cleaning or replacement. This approach has the following inherent drawbacks: First, unplanned shutdowns or reduced-load operation of the desulfurization system can interrupt the flue gas desulfurization process, potentially causing a momentary exceedance of sulfur dioxide emissions, violating environmental emission standards. Second, manual disassembly and cleaning involves operations inside the tower, high-altitude work, and slurry discharge, which are time-consuming and labor-intensive. Frequent disassembly and assembly can damage the nozzle's sealing surface or strip the threads, shortening the lifespan of the nozzles and fittings. Third, manual unclogging is a reactive measure; there is a significant time lag between the occurrence of clogging and its discovery and resolution. During this period, the nozzle atomization effect has continuously deteriorated, the reaction efficiency between the slurry and flue gas has decreased, limestone utilization has declined, and gypsum quality may also be adversely affected. It is evident that the existing limestone slurry nozzles cannot clear blockages on their own during operation, which has become a technical bottleneck restricting the long-term, high-stability, and high-efficiency operation of desulfurization systems. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem that existing limestone slurry nozzles do not have an automatic unclogging function, and to provide a limestone cleaning nozzle with a self-cleaning structure and its cleaning method.

[0005] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, embodiments of the present invention disclose a limestone cleaning nozzle with a self-cleaning structure, comprising a nozzle body, wherein a main channel for conveying limestone slurry is provided axially inside the nozzle body; and at least one lateral flow channel, wherein the lateral flow channel is connected to the main channel, and a self-cleaning unit is provided in the lateral flow channel; The self-cleaning unit includes: a side temporary storage channel, one end of which is connected to the main channel, and the other end of which is connected to a temporary storage power component; the temporary storage power component has a cavity inside, and a sliding partition is slidably and sealed inside the cavity, the sliding partition dividing the cavity into a temporary storage cavity and a power cavity that are not connected to each other; the temporary storage cavity is connected to the side temporary storage channel; the power cavity is connected to the main channel through a side power channel; when the main channel is blocked, the pressure in the power cavity increases and drives the sliding partition to move towards the temporary storage cavity, forcing the limestone slurry in the temporary storage cavity to be ejected at high speed through the side temporary storage channel to clear the blockage in the main channel.

[0006] Further improvements are made in the following aspects: The lateral flow channel includes: the side power channel, whose inlet end is connected to the upstream section of the main channel and whose outlet end is connected to the power cavity; and the side temporary storage channel, whose inlet end is connected to the upstream or midstream section of the main channel and whose outlet end is connected to the temporary storage cavity.

[0007] The temporary power storage component is located outside or inside the nozzle body, and the outlet end of the side temporary storage channel is connected to the temporary storage cavity through the inlet of the temporary power storage component.

[0008] A sealing element is provided between the outer peripheral wall of the sliding partition and the inner wall of the cavity, and the sliding partition can reciprocate along the axial direction of the cavity.

[0009] The flow cross-sectional area of ​​the side power channel is larger than that of the side temporary storage channel.

[0010] Solenoid valves are respectively installed on the side power channel and the side temporary storage channel to control the opening and closing of the channels.

[0011] When the main channel is under normal operating pressure, the pressure in the power chamber and the pressure in the temporary storage chamber keep the sliding partition balanced or move it to one side of the power chamber. When the main channel is blocked, causing the internal pressure to rise to a preset threshold, the pressure in the power chamber increases and pushes the sliding partition to compress the temporary storage chamber, thereby achieving self-cleaning.

[0012] The nozzle body has a threaded connection at its inlet end for connecting to a limestone slurry supply pipeline, and the axis of the main channel coincides with the axis of the threaded connection.

[0013] Secondly, embodiments of the present invention disclose a cleaning method based on the above-mentioned limestone cleaning nozzle with a self-cleaning structure, comprising: Pre-storage steps: When the nozzle body is spraying limestone slurry normally, a portion of the limestone slurry is stored in the temporary storage chamber through the side temporary storage channel, while a portion of the limestone slurry is stored in the power chamber through the side power channel, and the pressure on both sides of the sliding partition is balanced or the temporary storage chamber is in an energy storage state. Triggering step: When the main channel is blocked, causing the internal pressure to rise, the pressure in the power chamber also rises, creating a pressure difference that drives the sliding partition to move towards the temporary storage chamber. Unblocking step: The movement of the sliding baffle compresses the temporary storage chamber, forcing the limestone slurry stored in the temporary storage chamber to be ejected at high speed through the side temporary storage channel and then enters the main channel in the opposite direction to remove the blockage by hydraulic flushing.

[0014] In the triggering step, when a blockage is detected in the main channel or the pressure in the main channel exceeds a preset threshold, the solenoid valves installed on the side power channel and the side storage channel are opened simultaneously, so that the high pressure in the power chamber is connected to the release path of the storage chamber, thereby realizing the rapid action of the sliding baffle and the reverse injection of high pressure slurry.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a limestone cleaning nozzle with a self-cleaning structure. By incorporating a side storage channel and a side power channel connected to the main channel, and a temporary storage and power component separated into a storage chamber and a power chamber by a sliding baffle, a self-cleaning mechanism driven by the pressure changes of the slurry itself is formed. When the nozzle is operating normally, some slurry can enter the storage chamber and the power chamber respectively, causing the pressure on both sides of the sliding baffle to tend to balance or putting the storage chamber in an energy storage state. Once the main channel becomes blocked, the pressure inside the main channel increases and is transmitted to the power chamber. The pressure in the power chamber increases accordingly and drives the sliding baffle to move towards the storage chamber, thereby pushing the pre-stored limestone slurry in the storage chamber back into the main channel at high speed through the side storage channel, achieving hydraulic flushing and removal of the blockage. This structure allows the nozzle to automatically clear blockages without stopping the system, requiring an external power source, or requiring manual disassembly, significantly improving the continuous operation capability of the desulfurization system and reducing manual maintenance costs. Meanwhile, the sliding baffle can be reset as the pressure recovers after the blockage is cleared, enabling multiple reuses. The blockage clearing response is timely and the effect is stable, effectively avoiding the problems of reduced atomization effect and reduced desulfurization efficiency caused by delayed blockage clearing. It has good economic and engineering practical value.

[0016] Furthermore, connecting the inlet end of the side power channel to the upstream section of the main channel ensures that the power chamber can preferentially obtain a stable and high slurry pressure when the nozzle is working normally, providing a reliable driving force reserve for the sliding baffle. On the other hand, connecting the inlet end of the side storage channel to the upstream or midstream section of the main channel is beneficial for quickly filling the storage chamber with sufficient slurry and maintaining the energy storage state during nozzle operation. At the same time, during unblocking, the high-pressure back-jet slurry can act more directly on the blocked area, improving the targeting and effectiveness of unblocking.

[0017] Furthermore, the temporary power storage component can be flexibly arranged outside or inside the nozzle body according to the nozzle installation space and the internal structure of the absorber tower. This facilitates the upgrading of existing nozzles and the integrated design of compact nozzles, enhancing adaptability to different desulfurization conditions. A sealing element is installed between the outer peripheral wall of the sliding baffle and the inner wall of the cavity, allowing the sliding baffle to reciprocate along the cavity axis. This not only ensures strict isolation between the temporary storage cavity and the power cavity, preventing slurry crossflow and pressure loss, but also ensures that the sliding baffle can smoothly reset and operate reliably for a long time under multiple pressure fluctuations, significantly extending the service life and unclogging stability of the self-cleaning mechanism.

[0018] Furthermore, by designing the flow cross-sectional area of ​​the side power channel to be larger than that of the side storage channel, high-pressure driving force can be established more quickly within the power chamber under the same pressure difference. Meanwhile, the smaller cross-sectional area of ​​the side storage channel significantly increases the flow velocity of the slurry discharged from the storage chamber, forming a high-speed jet that produces a "water jet"-like flushing effect. This allows for stronger hydraulic impact to break down stubborn scale or tightly packed solid particles, further improving the unclogging success rate and response speed. In summary, these additional features work synergistically to substantially improve the limestone cleaning nozzle of this invention in terms of self-cleaning reliability, layout flexibility, durability, and unclogging strength.

[0019] This invention discloses a cleaning method for a limestone cleaning nozzle with a self-cleaning structure. This method dynamically couples the nozzle's self-cleaning process with the pressure changes of the limestone slurry itself through three logically clear steps: pre-storage, triggering, and unblocking. This achieves an automated unblocking process that requires no manual intervention or external power. In the pre-storage step, during normal operation, a certain amount of slurry is stored in the storage chamber to maintain the pressure reserve in the power chamber, essentially pre-establishing "standby" unblocking energy for the nozzle. When a blockage occurs, causing an abnormal increase in the main channel pressure, the triggering step automatically utilizes this pressure change to automatically generate a pressure difference that drives the sliding baffle. This eliminates the need for additional sensors and complex control systems, ensuring timely response and high reliability. In the unblocking step, the sliding baffle compresses the storage chamber, spraying the stored slurry at high speed into the main channel in a reverse direction. This water jet precisely targets the blocked area, resulting in a rapid and effective unblocking process. Furthermore, by setting up solenoid valves and simultaneously opening them on both the side power channel and the side storage channel when blockage or pressure exceeding the threshold is detected, the high pressure in the power chamber and the release path in the storage chamber can be synchronously connected. This ensures that the sliding baffle moves rapidly under maximum pressure difference, while preventing slurry from flowing back through the storage chamber unnecessarily, thus improving the certainty of the unblocking action and the energy utilization efficiency. Compared with the existing technology that requires shutdown and disassembly for cleaning, the method provided by this invention achieves nozzle self-diagnosis and self-repair without interrupting the desulfurization process or increasing energy consumption, significantly reducing operation and maintenance costs and extending the continuous service life of the nozzles. It is particularly suitable for flue gas desulfurization scenarios in coal-fired power plants where system stability requirements are stringent. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a limestone cleaning nozzle with a self-cleaning structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the main channel of a limestone cleaning nozzle with a self-cleaning structure in an embodiment of the present invention.

[0022] Wherein: 1- Nozzle body; 2- Main channel; 3- Side power channel; 4- Side temporary storage channel; 5- Temporary power storage component; 6- Cavity; 7- Temporary storage cavity; 8- Power cavity; 9- Sliding partition; 10- Solenoid valve. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention 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 the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 and Figure 2 This invention discloses a limestone cleaning nozzle with a self-cleaning structure, comprising a nozzle body 1, wherein a main channel 2 for conveying limestone slurry is provided axially inside the nozzle body 1; and at least one lateral flow channel, wherein the lateral flow channel is connected to the main channel 2, and a self-cleaning unit is provided in the lateral flow channel. The self-cleaning unit includes: a side temporary storage channel 4, one end of which is connected to the main channel 2, and the other end of which is connected to a temporary storage power component 5; the temporary storage power component 5 has a cavity 6 inside, and a sliding partition 9 is slidably disposed in the cavity 6, the sliding partition 9 dividing the cavity 6 into a temporary storage cavity 7 and a power cavity 8 that are not connected to each other; the temporary storage cavity 7 is connected to the side temporary storage channel 4; the power cavity 8 is connected to the main channel 2 through a side power channel 3; when the main channel 2 is blocked, the pressure in the power cavity 8 increases and drives the sliding partition 9 to move towards the temporary storage cavity 7, forcing the limestone slurry in the temporary storage cavity 7 to be sprayed out at high speed through the side temporary storage channel 4 to clear the blockage in the main channel 2.

[0030] This invention discloses a limestone cleaning nozzle with a self-cleaning structure. By incorporating a side storage channel and a side power channel connected to the main channel, and a temporary storage and power component separated into a storage chamber and a power chamber by a sliding baffle, a self-cleaning mechanism driven by the pressure changes of the slurry itself is formed. When the nozzle is operating normally, some slurry can enter the storage chamber and the power chamber respectively, causing the pressure on both sides of the sliding baffle to tend to balance or putting the storage chamber in an energy storage state. Once the main channel becomes blocked, the pressure inside the main channel increases and is transmitted to the power chamber. The pressure in the power chamber increases accordingly and drives the sliding baffle to move towards the storage chamber, thereby pushing the pre-stored limestone slurry in the storage chamber back into the main channel at high speed through the side storage channel, achieving hydraulic flushing and removal of the blockage. This structure allows the nozzle to automatically clear blockages without stopping the system, requiring an external power source, or requiring manual disassembly, significantly improving the continuous operation capability of the desulfurization system and reducing manual maintenance costs. Meanwhile, the sliding baffle can be reset as the pressure recovers after the blockage is cleared, enabling multiple reuses. The blockage clearing response is timely and the effect is stable, effectively avoiding the problems of reduced atomization effect and reduced desulfurization efficiency caused by delayed blockage clearing. It has good economic and engineering practical value.

[0031] The lateral flow channel includes: a side power channel 3, whose inlet end is connected to the upstream section of the main channel 2, and whose outlet end is connected to the power chamber 8; and a side temporary storage channel 4, whose inlet end is connected to the upstream or midstream section of the main channel 2, and whose outlet end is connected to the temporary storage chamber 7. Connecting the inlet end of the side power channel to the upstream section of the main channel ensures that the power chamber can preferentially obtain a stable and high slurry pressure when the nozzle is working normally, providing a reliable driving force reserve for the sliding baffle; while connecting the inlet end of the side temporary storage channel to the upstream or midstream section of the main channel is beneficial for quickly filling the temporary storage chamber with sufficient slurry and maintaining the energy storage state during nozzle operation, and at the same time, it allows the high-pressure back-jet slurry to act more directly on the blocked area during unblocking, improving the targeting and effectiveness of unblocking.

[0032] The temporary storage power component 5 is located outside or inside the nozzle body 1, and the outlet end of the side temporary storage channel 4 is connected to the temporary storage chamber 7 through the inlet of the temporary storage power component 5. A sealing element is provided between the outer peripheral wall of the sliding baffle 9 and the inner wall of the chamber 6, and the sliding baffle 9 can reciprocate along the axial direction of the chamber 6. The flow cross-sectional area of ​​the side power channel 3 is larger than that of the side temporary storage channel 4. The temporary storage power component can be flexibly arranged outside or inside the nozzle body according to the nozzle installation space and the internal structure of the absorption tower, which is convenient for the modification and upgrading of existing nozzles and also facilitates the integrated design of compact nozzles, enhancing the adaptability under different desulfurization conditions. The sealing element between the outer peripheral wall of the sliding baffle and the inner wall of the chamber, and the reciprocating sliding of the sliding baffle along the axial direction of the chamber, not only ensures strict isolation between the temporary storage chamber and the power chamber, preventing slurry crossflow and pressure loss, but also ensures that the sliding baffle can smoothly reset and operate reliably for a long time under multiple pressure fluctuations, significantly extending the service life and unclogging stability of the self-cleaning mechanism.

[0033] Solenoid valves 10 are respectively installed on the side power channel 3 and the side temporary storage channel 4 to control the opening and closing of the channels. When the main channel 2 is under normal operating pressure, the pressure in the power chamber 8 and the pressure in the temporary storage chamber 7 keep the sliding baffle 9 in balance or move it to one side of the power chamber 8; when the main channel 2 is blocked, causing the internal pressure to rise to a preset threshold, the pressure in the power chamber 8 increases and pushes the sliding baffle 9 to compress the temporary storage chamber 7, achieving self-cleaning. The inlet end of the nozzle body 1 is provided with a threaded connection part for connecting to the limestone slurry supply pipeline, and the axis of the main channel 2 coincides with the axis of the threaded connection part.

[0034] This invention also discloses a cleaning method for a limestone cleaning nozzle with a self-cleaning structure, comprising: Pre-storage steps: When the nozzle body 1 is spraying limestone slurry normally, a portion of the limestone slurry is stored in the temporary storage chamber 7 through the side temporary storage channel 4, while a portion of the limestone slurry is stored in the power chamber 8 through the side power channel 3, and the pressure on both sides of the sliding partition 9 is balanced or the temporary storage chamber 7 is in an energy storage state. Triggering Step: When the main channel 2 becomes blocked, causing the internal pressure to rise, the pressure in the power chamber 8 also rises, creating a pressure difference that drives the sliding baffle 9 to move towards the temporary storage chamber 7. When a blockage in the main channel 2 is detected or the pressure in the main channel 2 exceeds a preset threshold, the solenoid valve 10 installed on the side power channel 3 and the side temporary storage channel 4 is simultaneously opened, connecting the high pressure in the power chamber 8 with the release path of the temporary storage chamber 7, thereby achieving rapid movement of the sliding baffle 9 and reverse injection of the high-pressure slurry. Unblocking step: The movement of the sliding baffle 9 compresses the temporary storage chamber 7, forcing the limestone slurry stored in the temporary storage chamber 7 to be ejected at high speed through the side temporary storage channel 4 and then enters the main channel 2 in the opposite direction to remove the blockage by water flushing.

[0035] This invention discloses a cleaning method for a limestone cleaning nozzle with a self-cleaning structure. This method dynamically couples the nozzle's self-cleaning process with the pressure changes of the limestone slurry itself through three logically clear steps: pre-storage, triggering, and unblocking. This achieves an automated unblocking process that requires no manual intervention or external power. In the pre-storage step, during normal operation, a certain amount of slurry is stored in the storage chamber to maintain the pressure reserve in the power chamber, essentially pre-establishing "standby" unblocking energy for the nozzle. When a blockage occurs, causing an abnormal increase in the main channel pressure, the triggering step automatically utilizes this pressure change to automatically generate a pressure difference that drives the sliding baffle. This eliminates the need for additional sensors and complex control systems, ensuring timely response and high reliability. In the unblocking step, the sliding baffle compresses the storage chamber, spraying the stored slurry at high speed into the main channel in a reverse direction. This water jet precisely targets the blocked area, resulting in a rapid and effective unblocking process. Furthermore, by setting up solenoid valves and simultaneously opening them on both the side power channel and the side storage channel when blockage or pressure exceeding the threshold is detected, the high pressure in the power chamber and the release path in the storage chamber can be synchronously connected. This ensures that the sliding baffle moves rapidly under maximum pressure difference, while preventing slurry from flowing back through the storage chamber unnecessarily, thus improving the certainty of the unblocking action and the energy utilization efficiency. Compared with the existing technology that requires shutdown and disassembly for cleaning, the method provided by this invention achieves nozzle self-diagnosis and self-repair without interrupting the desulfurization process or increasing energy consumption, significantly reducing operation and maintenance costs and extending the continuous service life of the nozzles. It is particularly suitable for flue gas desulfurization scenarios in coal-fired power plants where system stability requirements are stringent.

[0036] The working principle of this invention is as follows: Before using the self-cleaning limestone cleaning nozzle structure, connect the threaded part at the top of the main channel 2 of the self-cleaning limestone cleaning nozzle structure to the limestone slurry supply equipment. The nozzle can spray limestone slurry to desulfurize the boiler flue gas. When using the self-cleaning limestone cleaning nozzle structure: the limestone slurry supply equipment delivers limestone slurry to the main channel 2 of the nozzle body 1, and then the limestone slurry is sprayed out from the nozzle body 1 to desulfurize the boiler flue gas. During this process, the limestone slurry is delivered through the main channel 2, and only a small amount of limestone slurry enters the side power channel 3 and the side temporary storage channel 4. The solenoid valve at the side power channel 3 is open and the solenoid valve 10 at the side temporary storage channel 4 is closed; a small amount of limestone slurry enters the side power channel 3, and then reaches the temporary power storage component 5 through the side temporary storage channel 4; subsequently, the limestone slurry pushes the sliding baffle 9 to move in the cavity 6, making the volume of the power cavity 8 larger and the volume of the temporary storage cavity 7 smaller. When the nozzle body 1 becomes clogged, and the slurry cannot be ejected from the main channel 2 or can only be ejected in small amounts, both solenoid valves 10 open. The pressure between the limestone slurry in the nozzle body 1 and the side power channel 3 and side temporary storage channel 4 changes, and the pressure of both increases synchronously with the pressure of the liquid in the main channel 2. Since the pipe diameter of the side power channel 3 is much larger than that of the side temporary storage channel 4, the pressure of the limestone slurry in the power chamber 8 increases significantly, which in turn pushes the sliding baffle 9 to move in the opposite direction, reducing the volume of the temporary storage chamber 7. The limestone slurry in the temporary storage chamber 7 flows out rapidly and is discharged through the side temporary storage channel 4. Since the diameter of the side temporary storage channel 4 is much smaller than that of the main channel 2, the pressure provided by the side temporary storage channel 4 is greatly enhanced, thereby clearing the clogged nozzle; the above process continues until the work is completed.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A limestone cleaning nozzle with a self-cleaning structure, characterized in that, The nozzle body (1) includes a main channel (2) for conveying limestone slurry, which is axially formed inside the nozzle body (1); and at least one lateral channel, which is connected to the main channel (2) and is provided with a self-cleaning unit. The self-cleaning unit includes: a side storage channel (4), one end of which is connected to the main channel (2), and the other end is connected to a storage power component (5); the storage power component (5) has a cavity (6) inside, and a sliding partition (9) is slidably disposed inside the cavity (6), the sliding partition (9) dividing the cavity (6) into a non-communicating storage cavity (7) and a power cavity (8); the storage cavity (7) is connected to the side storage channel (4); the power cavity (8) is connected to the main channel (2) through a side power channel (3); when the main channel (2) is blocked, the pressure in the power cavity (8) increases and drives the sliding partition (9) to move towards the side of the storage cavity (7), forcing the limestone slurry in the storage cavity (7) to be ejected at high speed through the side storage channel (4) to clear the blockage in the main channel (2).

2. The limestone cleaning nozzle with a self-cleaning structure according to claim 1, characterized in that, The lateral flow channel includes: the side power channel (3), whose inlet end is connected to the upstream section of the main channel (2), and whose outlet end is connected to the power cavity (8); the side temporary storage channel (4), whose inlet end is connected to the upstream or midstream section of the main channel (2), and whose outlet end is connected to the temporary storage cavity (7).

3. The limestone cleaning nozzle with a self-cleaning structure according to claim 2, characterized in that, The temporary power unit (5) is located outside or inside the nozzle body (1), and the outlet end of the side temporary storage channel (4) is connected to the temporary storage cavity (7) through the inlet of the temporary power unit (5).

4. The limestone cleaning nozzle with a self-cleaning structure according to claim 1, characterized in that, A sealing element is provided between the outer peripheral wall of the sliding partition (9) and the inner wall of the cavity (6), and the sliding partition (9) can slide back and forth along the axial direction of the cavity (6).

5. The limestone cleaning nozzle with a self-cleaning structure according to claim 1, characterized in that, The flow cross-sectional area of ​​the side power channel (3) is larger than that of the side temporary storage channel (4).

6. The limestone cleaning nozzle with a self-cleaning structure according to claim 1, characterized in that, Solenoid valves (10) are respectively provided on the side power channel (3) and the side temporary storage channel (4) to control the opening and closing of the channels.

7. The limestone cleaning nozzle with a self-cleaning structure according to claim 1, characterized in that, When the main channel (2) is under normal operating pressure, the pressure in the power chamber (8) and the pressure in the temporary storage chamber (7) cause the sliding partition (9) to remain in balance or move toward the power chamber (8). When the main channel (2) is blocked, causing the internal pressure to rise to a preset threshold, the pressure in the power chamber (8) increases and pushes the sliding partition (9) to compress the temporary storage chamber (7), thereby achieving self-cleaning.

8. The limestone cleaning nozzle with a self-cleaning structure according to claim 1, characterized in that, The nozzle body (1) has a threaded connection at its inlet end for connecting to a limestone slurry supply pipeline, and the axis of the main channel (2) coincides with the axis of the threaded connection.

9. A cleaning method based on a limestone cleaning nozzle with a self-cleaning structure as described in any one of claims 1-8, characterized in that, include: Pre-storage steps: When the nozzle body (1) sprays limestone slurry normally, a portion of the limestone slurry is stored in the temporary storage chamber (7) through the side temporary storage channel (4), while a portion of the limestone slurry is stored in the power chamber (8) through the side power channel (3), and the pressure on both sides of the sliding partition (9) is balanced or the temporary storage chamber (7) is in an energy storage state. Triggering step: When the main channel (2) is blocked, causing the internal pressure to rise, the pressure in the power chamber (8) will rise accordingly, forming a pressure difference that drives the sliding partition (9) to move toward the temporary storage chamber (7). Unblocking step: The movement of the sliding baffle (9) compresses the temporary storage chamber (7), forcing the limestone slurry stored in the temporary storage chamber (7) to be ejected at high speed through the side temporary storage channel (4) and enter the main channel (2) in the opposite direction to remove the blockage by water flushing.

10. The cleaning method for a limestone cleaning nozzle with a self-cleaning structure according to claim 9, characterized in that, In the triggering step, when the main channel (2) is detected to be blocked or the pressure in the main channel (2) exceeds the preset threshold, the solenoid valve (10) set on the side power channel (3) and the side temporary storage channel (4) is opened at the same time, so that the high pressure of the power chamber (8) is connected to the release path of the temporary storage chamber (7), thereby realizing the rapid action of the sliding partition (9) and the reverse injection of high pressure slurry.

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