High-energy shock wave soot blower

Abstract

This invention discloses a high-energy shockwave soot blowing device, comprising a shockwave generating unit and a stepping shockwave ejection unit connected to the shockwave generating unit. The shockwave generating unit converts high-pressure air into a high-energy shockwave, which is then delivered to the stepping shockwave ejection unit through a pipeline. The high-energy shockwave drives the stepping shockwave ejection unit to rotate and eject, thus achieving the purpose of shockwave soot blowing. This invention utilizes a shockwave generating unit with a specific structure to generate a shockwave airflow containing higher energy, and then uses this high-energy shockwave airflow as a driving source to achieve stepping rotational positioning before ejection. Compared with existing shockwave soot blowing devices, this invention has higher soot blowing efficiency due to its higher shockwave energy content, and the stepping rotational ejection structure ensures stable soot blowing range and effect with a small working blind zone, thereby achieving better soot blowing results.

Description

Technical Field

[0001] This invention relates to a shock wave soot blowing device, specifically a high-energy shock wave soot blowing device that utilizes a high-energy generating valve in conjunction with a stepping rotary soot blowing nozzle to achieve high energy, high efficiency and small blind zone. Background Technology

[0002] When the boiler operates at low load, the low flue gas velocity causes a large amount of ash particles to settle on the preheater tube sheet. When the ash settles on the tube sheet and partially or completely blocks the tube openings, the flow of flue gas through the tube decreases or is interrupted, reducing the heat generated by the high-temperature flue gas to heat the tube wall and causing the tube wall temperature to drop. When the tube temperature falls below the flue gas dew point temperature (136°C), condensation occurs in the flue gas inside the tube. This condensation causes the ash deposited at the tube openings to clump together. At higher temperatures, this clump of ash quickly hardens and adheres firmly to the tube wall, causing blockage. Prolonged low-load operation of the boiler accelerates this process. Furthermore, the use of fuel oil during boiler startup and ignition produces oil residue that adheres to the surface of the tail-end air preheater, also causing ash and scale buildup on the tube surfaces. If this ash and scale is not treated promptly, it may eventually block the tube openings, affecting the normal operation and safety of the boiler.

[0003] To address the aforementioned issues, current boiler systems are equipped with corresponding soot blowers. Soot blowers are categorized into acoustic soot blowers and shock wave soot blowers, which operate on different principles. Acoustic soot blowers have a wide range but low kinetic energy, while shock wave soot blowers have a narrow range but high kinetic energy. Currently, there are two types of shock wave soot blowers: pneumatic and gas explosion types, which utilize high-pressure air in conjunction with a shock wave generating valve to generate shock waves; and gas explosion types, which utilize the shock wave generated by the combustion of fuel gas. Compared to gas explosion types, high-pressure air is more environmentally friendly and has lower operating costs, leading to its increasingly widespread use. However, compared to gas explosion types, high-pressure air shock waves have lower pressure and lower kinetic energy. Specifically, the lower pressure and kinetic energy depend on both the air source pressure and the shock wave generating valve. Current shock wave generating valves are not suitable for generating high-pressure, high-energy shock waves because the valve core, the control component used to open and close the generating valve, is made of rubber. In practice, excessively high air pressure can cause the valve core to deform and leak.

[0004] In addition, to compensate for the shortcomings of shock wave soot blowing, many shock wave soot blowing nozzles currently use a rotary type, that is, the spray angle is rotatable. In order to achieve the above-mentioned rotational action and to be used stably in high temperature environments, such nozzles currently consist of a fixed part and a rotating part rotatably mounted on the fixed part. The shock wave is guided from the fixed part to the rotating part, and the rotating part is provided with at least one shock wave nozzle. At the connection between the rotating part and the fixed part, the rotating part itself has a built-in inclined baffle. When the shock wave passes through the connection position, the shock wave blows the inclined baffle, giving the rotating part an axial driving force, thereby realizing the rotation of the rotating part, and finally realizing the reversal of the shock wave soot blowing.

[0005] Structurally, the above structure seems to be able to achieve the rotational reversal of shock wave soot blowing very well. However, in practical use, the above structure has obvious shortcomings. Specifically, firstly, the rotating installation structure itself is prone to jamming due to dust accumulation. Secondly, its rotation has a large degree of randomness and cannot actually rotate in an orderly step-by-step manner. After the shock wave is blown out, many factors such as the position of the baffle and the resistance of the rotation will change the rotation angle each time. This may cause some positions to be blown multiple times, while some positions may not be blown at all due to incomplete rotation. The reliability and stability of the operation are both insufficient.

[0006] In conclusion, current shockwave soot blowing devices are inadequate in both soot blowing efficiency and soot blowing effect, and there is significant room and necessity for improvement. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-energy shock wave blowing device that can generate high-energy shock waves and use the shock waves to drive step-by-step rotating ejection.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a high-energy shock wave blowing device, comprising a shock wave generating unit and a stepping shock wave ejection unit connected to the shock wave generating unit. The shock wave generating unit converts high-pressure air into high-energy shock waves and sends the high-energy shock waves to the stepping shock wave ejection unit through a pipeline. The high-energy shock waves drive the stepping shock wave ejection unit to rotate and then eject, thereby achieving the purpose of shock wave blowing.

[0009] To generate a shock wave, the shock wave generating unit consists of a high-pressure gas source and a shock wave generating valve connected and cooperating with the high-pressure gas source. The shock wave generating valve includes a valve body with dual flow channels, a valve core for sealing the flow channels of the valve body and generating a shock wave, and a valve cover for fixing the valve core to the valve body and sealing one end of the valve body. In the above structure, a top pressure spring is provided between the valve cover and the valve core, and a pressure sensor opposite to the top pressure spring is installed on the valve cover. During operation, the valve core is sealed by the top pressure spring to the two flow channels in the valve body. When the air pressure value in one flow channel exceeds the design threshold, the valve core is opened by the airflow, connecting the two flow channels and instantly generating a shock wave airflow. When the air pressure is lower than the threshold, the valve core closes again, completing the shock wave generating action.

[0010] To cooperate with the shock wave generating unit and achieve rotating ejection, the stepping shock wave ejection unit consists of a main intake pipe, a rotating nozzle, and a stepping rotating mechanism for connecting the main intake pipe and the rotating nozzle. The main intake pipe is connected to the annular intake channel within the shock wave generating unit. The shock wave generated by the shock wave generating unit enters through the main intake pipe, passes through the stepping rotating mechanism, and is ejected from the rotating nozzle. The stepping rotating mechanism consists of a fixed seat with an annular one-way guide groove and a movable seat with guide posts inserted into the annular one-way guide groove. Within the stepping rotating mechanism, the movable seat connected to the rotating nozzle is installed within the fixed seat connected to the main intake pipe, forming an assembly. The movable seat and the fixed seat have a free travel distance in the vertical direction for operation. At least three guide posts evenly distributed on the sides of the movable seat cooperate with the annular one-way guide groove. During operation, when the shock wave enters the movable seat from the fixed seat, the shock wave airflow drives the movable seat to move upward. During this movement, the annular one-way guide groove and the guide posts cooperate to form a preset rotational reversal.

[0011] Furthermore, the valve core component within the shock wave generating unit is a sandwich composite structure, consisting of a rubber component and an inner core fixed within the rubber component. The valve core component is a three-ring structure with a progressively thinning structure consisting of an intake sealing part, an exhaust sealing part, and an elastic deformation part. The exhaust sealing part and the intake sealing part contain the inner core, which is a two-ring structure with a progressively thinning structure. The elastic deformation part is pressed and fixed onto the valve body by the valve cover, sealing the end face of the valve body.

[0012] Furthermore, the two flow channels within the valve body of the shock wave generating unit are a central shock wave flow channel located in the center and connected to the stepping shock wave ejection unit via a pipe, and an annular inlet flow channel located outside the central shock wave flow channel, concentric with the central shock wave flow channel, and connected to the high-pressure gas source via a pipe. The annular inlet flow channel has a two-section structure, including a narrow diameter section that mates with the valve core and a wide diameter channel that connects to the narrow diameter section.

[0013] To elaborate further, the annular unidirectional guide channel within the step-type shock wave ejection unit consists of a lower V-shaped channel and an upper unidirectional guide channel that is misaligned with the V-shaped channel. The V-shaped channel is used for positioning, and the unidirectional guide channel is used for rotation and reversal. During operation, the guide column rotates upward under the guidance of the unidirectional guide channel, and then falls into the V-shaped channel under its own gravity.

[0014] This invention utilizes a shock wave generating unit with a specific structure to generate a shock wave airflow containing higher energy, and then uses this high-energy shock wave airflow as a driving source to achieve step-by-step rotational displacement before ejection. Compared with existing shock wave soot blowing devices, it has higher soot blowing efficiency due to its higher shock wave energy, and the step-by-step rotational ejection structure makes its soot blowing range and effect stable with a small working blind zone, thus achieving better soot blowing effect. Attached Figure Description

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0016] Figure 1 This is a schematic diagram of the structure of Example 1.

[0017] Figure 2 This is a schematic diagram of the shock wave generating unit in Example 1.

[0018] Figure 3 This is a schematic diagram of the internal structure of the shock wave generating valve in the shock wave generating unit in Example 1.

[0019] Figure 4 This is a schematic diagram of the structure of the shock wave generating valve in Example 1.

[0020] Figure 5 This is a schematic diagram of the valve core inside the shock wave generating valve in Example 1.

[0021] Figure 6 This is a schematic diagram of the internal structure of the shock wave generating valve in the open state in Example 1.

[0022] Figure 7 This is a schematic diagram of the stepping shock wave ejection unit in Example 1.

[0023] Figure 8 This is a schematic diagram of the internal structure of the stepping shock wave ejection unit in Example 1.

[0024] Figure 9 This is a partial diagram of the reversing operation of the stepping shock wave ejection unit in Example 1.

[0025] Figure 10 This is a partial diagram of the reversing operation of the stepping shock wave ejection unit in Example 1.

[0026] Figure 11This is a partial diagram of the reversing operation of the stepping shock wave ejection unit in Example 1.

[0027] Figure 12 This is a schematic diagram of the overall structure of Example 2.

[0028] Figure 13 This is a schematic diagram of the internal structure at point A in Example 2.

[0029] Figure 14 This is a schematic diagram of the overall structure of Example 3.

[0030] Figure 15 This is a schematic diagram of the internal structure at point A in Example 3. Implementation

[0031] To facilitate a further understanding of the present invention, embodiments are now described in conjunction with the accompanying drawings to provide a further explanation of the invention.

[0032] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this specification or its application or use.

[0033] 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 discussed further in subsequent figures.

[0034] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0035] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances. Example

[0036] like Figure 1 In the exemplary structural diagram shown, the shock wave generating unit 1 is connected to the stepping shock wave ejection unit 2. When working, the shock wave generating unit 1 generates a high-energy shock wave and sends the shock wave into the stepping shock wave ejection unit 2. Before ejection, the shock wave drives the stepping shock wave ejection unit 2 to rotate one working position.

[0037] In terms of specific structure, such as Figure 2-6In the diagram shown, the shock wave generating unit 1 consists of a high-pressure air source 3 and a shock wave generating valve 4 connected and cooperating with the high-pressure air source 3. Generally, the high-pressure air source 3 is selected as an air storage tank equipped with an air pump to generate high-pressure air. The valve body 401 inside the shock wave generating valve 4 consists of an annular outer tube 402 and an inner tube 403 fixed inside the outer tube 402 and concentric with the outer tube 402. The inner tube 403 is used to form a central shock wave channel 404. The fitting gap between the inner tube 403 and the outer tube 402 forms an annular inlet that communicates with the high-pressure air source 3. The airflow channel 405, annular inlet airflow channel 405, is connected to the stepping shock wave ejection unit 2 via a pipe; the valve core 406, used to seal the annular inlet airflow channel 405 and the central shock wave channel 404, consists of an exhaust sealing part 407, an inlet sealing part 408, and an elastic deformation part 409 made of rubber, from the inside out. An inner core 410 is sandwiched within the exhaust sealing part 407 and the inlet sealing part 408. The inner core 410 is used to strengthen the structural strength of the exhaust sealing part 407 and the inlet sealing part 408 to meet the sealing requirements of higher air pressure applications. The elastic deformation part 409 in the valve core 406 is pressed and fixed to the end face of the outer pipe fitting 402 by the valve cover 411, so that the valve core 406 completely seals the end face of the outer pipe fitting 402. A pressure spring 412 is provided inside the valve cover 411 to press against the valve core 406. To monitor the occurrence of the shock wave, the pressure spring 412 is aligned and cooperates with a pressure sensor 413. Figure 6 In the operating state shown, the high-pressure airflow from the high-pressure air source 3 enters the annular inlet channel 405. Due to the air intake sealing part 408 in the valve core 406, the high-pressure airflow accumulates and has nowhere to be released. When the pressure of the high-pressure airflow increases to exceed the design elastic force of the compression spring 412, the valve core 406 is lifted. At this time, correspondingly, the air intake sealing part 408 opens the central shock wave channel 404. With both channels open, since the elastic deformation part 409 is still sealed with the end face of the outer pipe 402, the high-pressure airflow enters the central shock wave channel 404 from the narrow diameter section 413 in the annular inlet channel 405 and enters the wide-narrow section 414, which further compresses the airflow. After entering the central shock wave channel 404, the volume increases rapidly and the airflow accelerates rapidly, thereby generating a high-speed, high-energy shock wave.

[0038] In terms of specific structure, such as Figure 7-8As shown, the main intake pipe 201 in the stepping shock wave ejection unit 2 is connected to the fixed base 203 in the stepping rotating mechanism 202. The main intake pipe 201 sends the shock wave emitted by the external shock wave generating unit 1 into the stepping rotating mechanism 202. The movable base 204 in the stepping rotating mechanism 202 is installed in the fixed base 203. Both the fixed base 203 and the movable base 204 are circular and of suitable size. The movable base 204 is connected to the rotating nozzle 209, and the rotation of the rotating nozzle 209 is driven by the stepping rotating mechanism 202. The movable base 204 and the fixed base 203 have a free stroke reserved in the vertical direction for working. Due to the existence of the above-mentioned free stroke, each time the main intake pipe 201 is connected to the fixed base 203, the shock wave emitted by the external shock wave generating unit 1 is sent into the stepping rotating mechanism 202. The shock wave airflow delivered by the intake pipe 201 propels the movable seat 204 to move a certain distance relative to the fixed seat 203. The fixed seat 203 has an annular one-way guide groove 206 on its side, and the movable seat 204 has three guide posts 207 that are inserted into the annular one-way guide groove 206 on its side. That is, a guide post 207 is set on the movable seat 204 at a radial interval of 120 degrees. The guide post 207 cooperates with the annular one-way guide groove 206. Under the push of the shock wave, when the movable seat 204 moves relative to the fixed seat 203, the movable seat 204 moves a preset position relative to the fixed seat 203. Since each secondary shock wave rotates one position, its rotation is stable and reliable, rather than random, and it is not easy to generate a dust blowing blind zone.

[0039] from Figure 9-11 In the given schematic diagram of the working principle, the fixed seat 203 and the movable seat 204 are not fixedly connected, but rather a movable connection with a limited free travel in the vertical direction. Based on this movable connection, when the shock wave enters from the main intake pipe 201, the shock wave first impacts the movable seat 204, causing the movable seat 204 to move upward. During the upward movement, due to the design of the annular one-way guide groove 206 inside the fixed seat 203, the guide post 207 connected to the movable seat 204 is guided by the annular one-way guide groove 206, causing the movable seat 204 to rotate by one position. After the shock wave passes, the movable seat 204 moves downward under the action of gravity and slides into the V-groove, completing the rotational displacement. Example

[0040] like Figure 12 , 13 The image shows a high-energy shock wave blowing device implemented by a single high-pressure air source 5 in conjunction with multiple shock wave generating units 6. The high-pressure air source 5 is a high-pressure air tank, and the multiple shock wave generating units 6 are fixed inside the high-pressure air tank. Each shock wave generating unit 6 is connected and cooperates with a corresponding stepping shock wave ejection unit 7. Example

[0041] like Figure 14-15The figure shows another high-energy shock wave blowing device for realizing high-energy shock wave blowing. In the figure, the high-pressure air source 8 is also a high-pressure air tank. The shock wave generating unit 9 is installed outside the high-pressure air tank and connected to the high-pressure air tank. The high-pressure air tank provides high-pressure air to the shock wave generating unit 9. The shock wave generating unit 9 converts the high-pressure air into a high-speed, high-energy shock wave and sends it into the stepping shock wave ejection unit 10 to realize shock wave blowing.

[0042] The two units of the present invention work together to not only generate a high-energy shock wave, but also to use the high-energy shock wave to achieve step-by-step rotation, which significantly improves the effect and efficiency of shock wave blowing.

[0043] The various embodiments of this specification have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technological improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.

Claims

1. A high-energy shock wave soot blowing device, characterized in that: The system consists of a shock wave generating unit and a stepping shock wave ejection unit connected to the shock wave generating unit. The shock wave generating unit converts high-pressure air into a high-energy shock wave, which is then delivered to the stepping shock wave ejection unit through a pipeline. The high-energy shock wave drives the stepping shock wave ejection unit to rotate and eject, achieving the purpose of shock wave soot blowing. The shock wave generating unit consists of a high-pressure air source and a shock wave generating valve connected and cooperating with the high-pressure air source. The shock wave generating valve includes a valve body with dual flow channels, a valve core for sealing the flow channels of the valve body and generating a shock wave, and a valve cover for fixing the valve core to the valve body and sealing one end of the valve body. A pressure spring is provided between the valve cover and the valve core, and a pressure sensor is installed on the valve cover opposite to the pressure spring. The stepping shock wave ejection unit consists of a main air inlet pipe, a rotating nozzle, and a nozzle for connecting to the main air inlet pipe. The shock wave generator unit is composed of a stepping rotating mechanism and a main intake pipe connected to an annular intake channel within the shock wave generator unit. The shock wave generated by the shock wave generator unit enters through the main intake pipe, passes through the stepping rotating mechanism, and then exits from the rotating nozzle. The stepping rotating mechanism consists of a fixed seat with an annular unidirectional guide groove and a movable seat with guide posts inserted into the annular unidirectional guide groove. Within the stepping rotating mechanism, the movable seat connected to the rotating nozzle is installed within the fixed seat connected to the main intake pipe, forming an assembly. The movable seat and the fixed seat have a free travel distance in the vertical direction for operation. At least three guide posts evenly distributed on the sides of the movable seat cooperate with the annular unidirectional guide groove. The valve core component within the shock wave generator unit is a sandwich composite structure, consisting of a rubber component and an inner core fixed within the rubber component. The valve core consists of a three-ring structure with a progressively thinner stepped design, comprising an exhaust sealing section, an intake sealing section, and an elastic deformation section. The exhaust sealing section and the intake sealing section contain an inner core with a similar progressively thinner stepped design. The elastic deformation section is pressed and fixed to the valve body by the valve cover, sealing the end face of the valve body. The annular unidirectional guide groove within the step-type shock wave ejection unit consists of a lower V-shaped groove and an upper unidirectional guide groove that is misaligned with the V-shaped groove. The V-shaped groove is used for positioning, and the unidirectional guide groove is used for rotational reversal. During operation, the guide column rotates upwards under the guidance of the unidirectional guide groove and then falls into the V-shaped groove under its own gravity.

2. The high-energy shock wave soot blowing device as described in claim 1, characterized in that: The two flow channels inside the valve body of the shock wave generating unit are a central shock wave flow channel located in the center and connected to the high-pressure gas source through a pipeline, and an annular inlet flow channel located outside the central shock wave flow channel and concentric with the central shock wave flow channel. The annular inlet flow channel, which is connected to the stepping shock wave ejection unit through a pipeline, has a two-section structure, including a narrow diameter section that cooperates with the valve core and a wide diameter channel that connects to the narrow diameter section.

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