A sootblowing device for plate type air preheater

Abstract

The present application discloses a sootblowing device for a plate-type air preheater, which relates to the field of removal or treatment of combustion products or combustion residues, and solves the problem that the sootblowing efficiency of the prior art sootblower is low or the life of the heat exchange plate is affected. The technical solution to this problem is mainly a sootblowing device for a plate-type air preheater, wherein an inner sleeve is provided inside an outer sleeve, the inner sleeve slides axially relative to the outer sleeve, a second through hole connecting the inner part of the outer sleeve and the inner sleeve is provided on the inner sleeve, a sealing ring is provided on the inner sleeve at the front and rear sides of the second through hole, the inner ring of the sealing ring is fixedly sealed with the outer wall of the inner sleeve, the outer ring of the sealing ring is slidably sealed with the inner wall of the outer sleeve, one end of the inner sleeve is sealed, and the other end is connected to the medium pipe, and an actuator for driving the inner sleeve to move forward and backward is provided outside the casing. The present application is mainly used to solve the problem that the sootblowing efficiency of the sootblower is low or the life of the heat exchange plate is affected.

Description

Technical Field

[0001] The present application relates to the field of removal or treatment of combustion products or combustion residues, and in particular to a soot blowing device for a plate-type air preheater. Background Art

[0002] Plate air preheater (air preheater) is an important equipment in thermal systems such as industrial boilers and power station boilers. Its main function is to use the waste heat of flue gas in the flue at the tail end of the boiler to heat the air that is about to enter the furnace, thereby improving the thermal efficiency of the boiler and reducing energy consumption. By preheating the air, the fuel can be burned more fully, reducing incomplete combustion losses, improving combustion efficiency, and at the same time reducing the exhaust temperature and heat loss. Among them, the wide flow channel corrugated plate air preheater: the wide flow channel corrugated plate sheet is used to form an external wall corrugated wall plate type and an internal fully transparent wide flow channel plate air preheater. The plate air preheater with a wide flow channel has the advantages of reducing dust accumulation, reducing resistance, and improving heat exchange efficiency. Since the flue gas channel formed between the heat exchange plates of the wide flow channel has a wide spacing, it can reduce the accumulation of dust in the flue gas in the channel, but the dust in the gaps of the heat exchange plates is still easy to accumulate.

[0003] During the combustion process of equipment such as boilers, combustion residues will be generated due to incomplete combustion of fuel and the presence of impurities in the fuel. If these residues are not handled in time, they will gradually accumulate in the air preheater, causing a series of problems: the residues accumulate on the heat exchange surface of the air preheater, forming an insulation layer that hinders the heat transfer between the flue gas and the air. This greatly reduces the heat exchange efficiency of the air preheater, resulting in a decrease in the thermal efficiency of the boiler and an increase in energy waste. For example, in power plant boilers, the decrease in heat exchange efficiency may lead to a decrease in power generation efficiency and increase power generation costs. The accumulation of residues will narrow the flue gas flow channel inside the air preheater, thereby increasing the resistance to flue gas flow. This requires a larger fan power to overcome the resistance, resulting in increased energy consumption, and will also increase the operating cost and maintenance difficulty of the equipment. For example, in industrial boilers, the increase in resistance may cause the fan to be overloaded, affecting the stable operation of the equipment.

[0004] Traditional air preheaters mostly use pulse soot blowers, sonic soot blowers and steam soot blowers. Pulse soot blowers use the principle of space oscillation to clean soot, sonic soot blowers use sound waves to produce high acceleration stripping and vibration fatigue crushing effects on accumulated soot, and steam soot blowers use steam pressure to blow away air preheater dust. Steam soot blowing has high injection pressure and fast speed. The rigidity of wide-channel plate air preheater components is relatively poor and is not suitable. It is easy to cause large fatigue losses to the plates and cause a large waste of steam. Pulse soot blowers and sonic soot blowers have a certain blowing range, and the soot blowing effect gradually weakens with the center point. At the same time, in actual operation, their adjustment frequency has a great influence on the soot blowing effect. Summary of the invention

[0005] In order to overcome the shortcomings of the sootblower in the prior art, such as low sootblowing efficiency or affecting the life of the heat exchange plate, the present application provides a sootblowing device for a plate-type air preheater, which can solve the problem of low sootblowing efficiency of the sootblower or affecting the life of the heat exchange plate.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a sootblowing device for a plate-type air preheater, comprising a casing, a plurality of heat exchange plates spaced along the front-to-back direction are connected to the casing, a flue gas channel is formed between two of the heat exchange plates, an outer sleeve penetrating the heat exchange plates is provided in the casing, a plurality of groups of first through holes connecting the flue gas channel and the inside of the outer sleeve are provided on the outer sleeve, each group of the first through holes corresponds to each flue gas channel, an inner sleeve is provided in the outer sleeve, the inner sleeve slides axially relative to the outer sleeve, and a There is a second through hole connecting the interior of the outer sleeve and the interior of the inner sleeve, and sealing rings are provided on the inner sleeve at the front and rear sides of the second through hole. The inner ring of the sealing ring is fixedly sealed with the outer wall of the inner sleeve, and the outer ring of the sealing ring is slidingly sealed with the inner wall of the outer sleeve. The spacing between the sealing rings is less than or equal to the spacing between two adjacent groups of first through holes. One end of the inner sleeve is sealed, and the other end is connected to the medium pipe. An actuator for driving the inner sleeve to move forward and backward is provided outside the casing, so that the second through hole is connected with each group of first through holes one by one as the inner sleeve moves.

[0007] The specific working process of adopting the above technical scheme is: inserting the inner sleeve provided with the sealing ring into the interior of the outer sleeve, and then conveying the medium to the inner sleeve through the medium pipe, and then the medium enters the interior of the outer sleeve and the space surrounded by the exterior of the inner sleeve and the two sealing rings through the second through hole, and then the smoke channel is cleaned of dust through the first through hole of the group. After cleaning one smoke channel, the inner sleeve continues to move axially relative to the outer sleeve, so that the first through hole of the next group is docked with the above space, so that the medium in the space cleans the dust of another smoke channel from the first through hole of the group, and so on. All smoke channels that need to be cleaned can be cleaned of dust. The present application has the following advantages: compared with the soot cleaner in the prior art, the soot blowing device can perform soot blowing operations on specific smoke channels in a targeted manner through the axial sliding of the inner sleeve in the outer sleeve, and the first through hole and the second through hole are set, which is different from the traditional pulse soot blower and Compared with the sonic soot blower, the present application, especially in the wide-channel plate-type air preheater, can achieve a more precise sootblowing range and a greater sootblowing pressure for the input medium under the same pressure and flow, and the sootblowing effect will not be weakened with the distance from the medium transmission point, thereby greatly improving the sootblowing efficiency. Compared with the steam sootblower, the sootblowing device of the present application can achieve precise sootblowing, thereby reducing energy waste; traditional steam sootblower is not suitable for wide-channel plate-type air preheater elements with relatively poor rigidity due to its high injection pressure and fast speed, because the heat exchange plate close to the steam sootblower is prone to large fatigue loss, while the sootblowing device of the present application adopts a structure of an inner sleeve and an outer sleeve, and blows out the medium through the first through hole to accurately clean the heat exchange plate, and does not require excessive pressure to clean a single heat exchange plate, so it will not generate excessive impact force on the heat exchange plate, thereby effectively protecting the life of the heat exchange plate.

[0008] Furthermore, the actuator includes a motor, a first transmission mechanism, a second transmission mechanism and a third transmission mechanism. The motor is connected to the first transmission mechanism for transmitting power to the second transmission mechanism and the third transmission mechanism. The second transmission mechanism is connected to the outer sleeve to drive the outer sleeve to rotate. The third transmission mechanism is connected to the inner sleeve to drive the inner sleeve to move linearly.

[0009] By adopting the above-mentioned technical solution, the outer sleeve is driven to rotate and the inner sleeve is driven to move linearly respectively by a motor and multiple transmission mechanisms, so that the soot blowing process can be accurately controlled and completely cleaned. Moreover, under the condition of an adjusted transmission ratio, automatic cleaning can be achieved without human observation and control, thus achieving efficient and targeted cleaning.

[0010] Furthermore, when the third actuator drives the inner sleeve to move a distance equal to the spacing between two adjacent groups of first through holes, the second transmission mechanism drives the outer sleeve to rotate greater than or equal to 360°.

[0011] The adoption of the above-mentioned technical solution can ensure that all-round soot blowing operations are carried out on each flue gas channel. Through precise mobile control, each flue gas channel can be carefully cleaned in turn to achieve full coverage of soot blowing. Compared with soot blowing in a single direction, this multi-angle and multi-directional soot blowing method can better break the adhesion of accumulated soot and enhance the soot blowing force.

[0012] Furthermore, the first through hole is a punched hole that is turned outward toward the smoke channel.

[0013] By adopting the above-mentioned technical solution, the punching of the outer flange can prevent the accumulation and clogging of the first through hole to a certain extent. Due to the existence of the flange, the ash is not easy to adhere to the edge of the through hole. Even if there is a small amount of ash accumulation, it is easy to be cleaned up under the impact of the soot blowing medium, ensuring the long-term stable operation of the soot blowing device. The punching design of the outer flange of the flue gas channel can also change the flow direction and diffusion angle of the soot blowing medium when it is ejected from the first through hole, so that the soot blowing medium can be more evenly diffused into the flue gas channel, and the ash on the heat exchange plate is impacted in all directions, thereby improving the soot blowing effect.

[0014] Furthermore, a plurality of the first through holes are arranged in a ring on the side wall of the outer sleeve, and the inclination angles of the first through holes in a group to the axis are different.

[0015] By adopting the above-mentioned technical solution, all-round coverage of the heat exchange plate can be achieved. No matter where the ash is located on the heat exchange plate, there is a high probability that it will be impacted by the soot blowing medium from different angles, which greatly improves the soot blowing effect. The soot blowing medium sprayed from the first through holes at different angles intersects with each other in the flue gas channel, which will produce complex airflow disturbances. This disturbance can break the stability of the ash accumulation and make it easier to be blown away. At the same time, the interaction of the airflows can also increase the kinetic energy of the soot blowing medium and improve the blowing force.

[0016] Furthermore, the inclination angle of the first through hole is 10°≤α≤170°.

[0017] Furthermore, the spacing between the sealing rings is the same as the spacing between two adjacent groups of first through holes; or the spacing between the sealing rings is smaller than the spacing between two adjacent groups of first through holes.

[0018] By adopting the above technical solution, when the spacing of the sealing rings is the same as the spacing of the two adjacent groups of first through holes, more precise sealing and soot blowing control can be achieved. In this case, the sealing rings can correspond to the position of the first through holes, ensuring that the soot blowing medium flows in a specific flue gas channel and avoids leakage to other areas; when the spacing of the sealing rings is smaller than the spacing of the two adjacent groups of first through holes, when the area between the sealing rings is between the two adjacent groups of first through holes, a certain high pressure can be accumulated in the space, so that more stubborn dust can be cleaned, and it is also suitable for some plate-type air preheaters with good rigidity.

[0019] Furthermore, the heat exchange plate is formed by welding two front and rear thin plates through a plurality of welding parts, and the outer sleeve passes through the welding parts.

[0020] By adopting the above-mentioned technical solution, the welding part usually has higher strength and rigidity, and the outer sleeve is arranged here to obtain a more solid support. In addition, arranging the outer sleeve at the welding part can make the structure of the sootblowing device more compact, reduce the occupied space, and avoid affecting the gas flow inside the heat exchange plate.

[0021] Furthermore, a plurality of the welding portions are provided with through holes, the through holes are evenly distributed in the up-down direction, and the outer sleeve is rotatably connected to the through holes.

[0022] By adopting the above-mentioned technical solution, the through holes on the multiple welding parts are rotatably connected to the outer sleeve, which is equivalent to adding multiple support points on the heat exchange plate. These support points can disperse the pressure and impact force from the outside, reduce the deformation of the heat exchange plate, and thus improve its rigidity; the outer sleeve itself usually has a certain strength and rigidity. After being connected to the heat exchange plate, it can provide additional support and constraint for the heat exchange plate, further enhancing the overall rigidity of the heat exchange plate.

[0023] Furthermore, one end of the outer sleeve extends into the casing and the other end extends out of the casing. The end surface extending into the casing is open and connected to the smoke channel. When the sealing ring moves to the end surface of the outer sleeve extending into the casing, there are gaps between the outer sleeve and the inner sleeve and the inner wall of the casing; or both ends of the outer sleeve extend out of the casing; the end of the outer sleeve extending out of the casing is connected to a detachable end cover.

[0024] By adopting the above-mentioned technical solution, the movement of the sealing ring can push the dust that enters the outer sleeve. Since it forms a relatively sealed space inside the outer sleeve, the dust will be gradually pushed to the end face of the outer sleeve as the sealing ring moves, and finally pushed out. This process effectively prevents the accumulation of dust inside the sleeve, ensuring the normal operation and efficient work of the sootblowing device. When the inner sleeve is taken out of the outer sleeve, the detachable end cover can cover the outer sleeve in time, which can prevent the dust that enters the outer sleeve from accidentally escaping. If the dust escapes, it will not only pollute the surrounding environment, but may also re-enter the heat exchange plate and other parts, affecting the heat exchange efficiency and normal operation of the equipment. By covering the end cover, the dust can be effectively controlled within a certain range, which is convenient for subsequent cleaning and treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further described below with reference to the accompanying drawings:

[0026] Figure 1 A schematic diagram of a sootblowing device for a plate-type air preheater according to the present application;

[0027] Figure 2 for Figure 1 A direction view;

[0028] Figure 3 for Figure 1 Partial view of the middle and outer sleeve in direction A;

[0029] Figure 4 is a schematic diagram of an inner sleeve and a sealing ring;

[0030] Figure 5 It is a schematic diagram of a sootblowing device embodiment 2 for a plate-type air preheater.

[0031] Description of the drawings: 1. Casing; 11. Smoke channel; 2. Heat exchange plate; 21. Welding part; 22. Through hole; 3. Outer sleeve; 31. First through hole; 4. Inner sleeve; 41. Second through hole; 42. Sealing ring; 5. Actuator; 6. End cover; 7. Medium pipe. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0033] The terms "first", "second", etc. (if any) in the specification and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish before a certain technical feature, it does not necessarily indicate that it has "first". It should be understood that in this application, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in this application, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z" "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0034] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0035] like Figures 1 to 4 As shown, the present application provides a sootblowing device for a plate-type air preheater, comprising a casing 1, wherein a plurality of heat exchange plates 2 spaced apart in a front-to-rear direction are connected to the casing 1, a flue gas passage 11 is formed between two of the heat exchange plates 2, an outer sleeve 3 penetrating the heat exchange plates 2 is provided in the casing 1, a plurality of groups of first through holes 31 connecting the flue gas passage 11 and the interior of the outer sleeve 3 are provided on the outer sleeve 3, each group of the first through holes 31 corresponds to each flue gas passage 11, an inner sleeve 4 is provided in the outer sleeve 3, the inner sleeve 4 slides axially relative to the outer sleeve 3, and a through hole 31 connecting the interior of the outer sleeve 3 is provided on the inner sleeve 4 and a second through hole 41 inside the inner sleeve 4, and sealing rings 42 are provided on the inner sleeve 4 at the front and rear sides of the second through hole 41, the inner ring of the sealing ring 42 is fixedly sealed with the outer wall of the inner sleeve 4, and the outer ring of the sealing ring 42 is slidingly sealed with the inner wall of the outer sleeve 3, and the spacing between the sealing rings 42 is less than or equal to the spacing between two adjacent groups of first through holes 31, one end of the inner sleeve 4 is sealed, and the other end is connected with the medium pipe 7, and an actuator 5 for driving the inner sleeve 4 to move forward and backward is provided outside the casing 1, so that the second through holes 41 are connected with each group of first through holes 31 one by one as the inner sleeve 4 moves.

[0036] The specific working process of the above technical solution is as follows: the inner sleeve 4 with the sealing ring 42 is inserted into the inner sleeve 3, and then the medium is transported to the inner sleeve 4 through the medium pipe 7. The medium then enters the space surrounded by the inner sleeve 3, the outer sleeve 4 and the two sealing rings 42 through the second through hole 41, and then the dust accumulation in the flue gas channel 11 is cleaned through the first through hole 31 of the group. After cleaning one flue gas channel 11, the inner sleeve 4 continues to move axially relative to the outer sleeve 3, so that the first through hole 31 of the next group is aligned with the above space. Then, the medium in the space is used to clean the dust accumulation in another flue gas channel 11 through the first through hole 31 of the group, and so on, all the flue gas channels 11 that need to be cleaned can be cleaned for dust accumulation, or, the actuator 5 pushes the inner sleeve 4 to continue to extend, and in the process of pushing, the dust cleaning medium is continuously entered into the corresponding flue gas channel 11 through the first through hole 31 for dust cleaning; the present application has the following advantages: compared with the dust cleaner in the prior art, the dust blowing device is realized by the axial sliding of the inner sleeve 4 in the outer sleeve 3, and the first through hole 3 is set 1 and the second through hole 41, soot blowing operation can be carried out on a specific flue gas channel 11 in a targeted manner. Compared with the traditional pulse soot blower and the sonic soot blower, the present application can achieve a more accurate soot blowing range and a greater soot blowing pressure for the input medium under the same pressure and flow rate, and the soot blowing effect will not be weakened with the distance from the medium transmission point, thereby greatly improving the soot blowing efficiency. Compared with the steam soot blower, the soot blowing device of the present application can achieve accurate soot blowing, so it can reduce energy waste; the traditional steam soot blower is not suitable for the wide flow plate air preheater element with relatively poor rigidity due to its high injection pressure and fast speed, because the heat exchange plate 2 close to the steam soot blower is prone to cause greater fatigue loss, while the soot blowing device of the present application adopts the structure of the inner sleeve 4 and the outer sleeve 3, and blows out the medium through the first through hole 31 to accurately clean the heat exchange plate 2, and does not require excessive pressure to clean a single heat exchange plate 2, so it will not generate excessive impact force on the heat exchange plate 2, thereby effectively protecting the life of the heat exchange plate 2.

[0037] Specifically, the air preheater can also be a plate-type air preheater with a wide flow channel; the outer sleeve 3 penetrates the heat exchange plate 2 and extends in the front-to-back direction; the outer sleeve 3 and the inner sleeve 4 are cylindrical shapes with the same center, such as round or square, and the axial direction refers to the direction of the virtual axis of the center; the soot blowing medium can use compressed air or relatively low-pressure steam. In some special environments (such as after dust removal of a biomass boiler, the flue gas contains a large amount of NH4CL, which may cause ammonium chloride to condense on the metal surface), pressurized water can also be used to clean the crystalline salt that is easily soluble in water.

[0038] Preferably, the outer sleeve 3 and the inner sleeve 4 are two coaxial sleeves after installation; the outer sleeve and the inner sleeve are continuously active during the cleaning operation to ensure the cleaning efficiency when using the cleaning medium for cleaning.

[0039] Furthermore, the actuator 5 includes a motor, a first transmission mechanism, a second transmission mechanism and a third transmission mechanism. The motor is connected to the first transmission mechanism for transmitting power to the second transmission mechanism and the third transmission mechanism. The second transmission mechanism is connected to the outer sleeve 3 to drive the outer sleeve to rotate. The third transmission mechanism is connected to the inner sleeve 4 to drive the inner sleeve 4 to move linearly.

[0040] By adopting the above-mentioned technical solution, the outer sleeve 3 is driven to rotate and the inner sleeve 4 is driven to move linearly through a motor and multiple transmission mechanisms respectively, so that the soot blowing process can be accurately controlled and completely cleaned. Moreover, automatic cleaning can be achieved under the condition of an adjusted transmission ratio without the need for human observation and control, thereby achieving efficient and targeted cleaning.

[0041] Specifically, one type of the first transmission mechanism and the second transmission mechanism is a gear set transmission, a group of transmission teeth in the gear set drives the outer sleeve 3 to rotate, and the third transmission mechanism is a rack transmission, one of the output teeth of the gear set is engaged with the rack to drive the inner sleeve to move.

[0042] Another type of first transmission mechanism and second transmission mechanism is a sleeve coaxially connected to the motor, which is coaxially connected to the outer sleeve to drive the rotation. The third transmission mechanism is a threaded transmission in which the internal thread in the sleeve and the external thread of the inner sleeve 4 cooperate. Since the sleeve is axially fixed, the inner sleeve will be moved during the threaded transmission.

[0043] There is also a type of planetary roller screw transmission mechanism in which the first transmission mechanism and the second transmission mechanism are rotating parts and the third transmission mechanism is the moving part.

[0044] The two transmission mechanisms described above that are capable of dividing the rotational power of the motor into the rotation of the outer sleeve 3 and the linear motion of the inner sleeve 4 both fall within the scope of protection requested by the present application.

[0045] Furthermore, when the single moving distance of the inner sleeve 4 is equal to the distance between two adjacent groups of first through holes, the second transmission mechanism drives the outer sleeve 3 to rotate greater than or equal to 360°.

[0046] The adoption of the above-mentioned technical solution can ensure that all-round soot blowing operations are carried out on each flue gas channel 11. Through precise movement control, each flue gas channel 11 can be carefully cleaned in turn to achieve full coverage of soot blowing. Compared with soot blowing in a single direction, this multi-angle and multi-directional soot blowing method can better break the adhesion of accumulated soot and enhance the soot blowing force.

[0047] Furthermore, the first through hole 31 is a punched hole that is turned outwardly toward the smoke channel 11 .

[0048] By adopting the above-mentioned technical solution, the punching of the outer flange can prevent the accumulation and clogging of the dust at the first through hole 31 to a certain extent. Due to the existence of the flange, the dust is not easy to adhere to the edge of the through hole, and even if there is a small amount of dust accumulation, it is easy to be cleaned up under the impact of the soot blowing medium, ensuring the long-term stable operation of the soot blowing device. The punching design of the outer flange of the flue gas channel 11 can also change the flow direction and diffusion angle of the soot blowing medium when it is ejected from the first through hole 31, so that the soot blowing medium can be more evenly diffused into the flue gas channel 11, and the dust on the heat exchange plate 2 is impacted in all directions, thereby improving the soot blowing effect.

[0049] Furthermore, a plurality of the first through holes 31 are provided and arranged in a ring on the side wall of the outer sleeve 3 , and the inclination angles of the first through holes 31 in a group to the axis are different.

[0050] By adopting the above-mentioned technical solution, all-round coverage of the heat exchange plate 2 can be achieved. No matter where the ash is located on the heat exchange plate 2, there is a high probability that it will be impacted by the soot blowing medium from different angles, which greatly improves the soot blowing effect. The soot blowing medium sprayed from the first through holes 31 at different angles intersects with each other in the flue gas channel 11, which will produce complex airflow disturbances. This disturbance can break the stability of the ash accumulation and make it easier to be blown away. At the same time, the interaction of the airflows can also increase the kinetic energy of the soot blowing medium and improve the blowing force.

[0051] Furthermore, the inclination angle of the first through hole 31 is 10°≤α≤170°.

[0052] Furthermore, the spacing between the sealing rings 42 is the same as the spacing between two adjacent groups of first through holes 31 .

[0053] By adopting the above-mentioned technical solution, when the spacing between the sealing rings 42 is the same as the spacing between two adjacent groups of first through holes 31, more precise sealing and sootblowing control can be achieved. In this case, the sealing ring 42 can correspond to the position of the first through hole 31 to ensure that the sootblowing medium flows in a specific flue gas channel 11 to avoid leakage to other areas.

[0054] Furthermore, the heat exchange plate 2 is formed by welding two front and rear thin plates through a plurality of welding portions 21 , and the outer sleeve 3 passes through the welding portions 21 .

[0055] By adopting the above-mentioned technical solution, the welding part 21 usually has higher strength and rigidity, and the outer sleeve 3 is arranged here to obtain a more solid support, and the outer sleeve 3 is arranged at the welding part 21 to make the structure of the sootblowing device more compact, reduce the occupied space, and avoid affecting the gas flow inside the heat exchange plate 2.

[0056] Furthermore, a plurality of the welding portions 21 are provided with through holes 22 , and the through holes 22 are evenly distributed in the up-down direction, and the outer sleeve 3 is rotatably connected to each of the through holes 22 .

[0057] By adopting the aforementioned technical solution, the through holes 22 on the multiple welding parts 21 are rotatably connected to the outer sleeve 3, which is equivalent to adding multiple support points on the heat exchange plate. These support points can disperse the pressure and impact force from the outside, reduce the deformation of the heat exchange plate, and thus improve its rigidity; the outer sleeve 3 itself usually has a certain strength and rigidity. After being connected to the heat exchange plate, it can provide additional support and constraint for the heat exchange plate, further enhancing the overall rigidity of the heat exchange plate.

[0058] Furthermore, one end of the outer sleeve 3 extends into the casing 1 and the other end extends out of the casing 1. The end face extending into the casing 1 is open and connected to the smoke channel 11. When the sealing ring 42 moves to the end face of the outer sleeve 3 extending into the casing 1, there are gaps between the outer sleeve 3 and the inner sleeve 4 and the inner wall of the casing 1. The end of the outer sleeve 3 extending out of the casing 1 is connected to a detachable end cover 6.

[0059] By adopting the above-mentioned technical scheme, the movement of the sealing ring 42 can push the dust entering the inner part of the outer sleeve 3. The outer sleeve is generally installed in the air preheater and is not disassembled. Therefore, during operation, there is a possibility that dust in the flue gas channel will enter the outer barrel. When operating, the inner and outer sleeves usually move from the end outside the casing to the end open inside the casing. Therefore, the dust in the outer sleeve will be gradually pushed to the end face of the outer sleeve 3 as the sealing ring 42 moves, and finally pushed into the flue gas channel. This process effectively prevents the accumulation of dust inside the sleeve, ensuring the normal operation and efficient operation of the soot blowing device. When the inner sleeve 4 is taken out of the outer sleeve 3, the detachable end cover 6 can cover the outer sleeve 3 in time, which can prevent the dust entering the outer sleeve 3 from accidentally escaping. If the dust escapes, it will not only pollute the surrounding environment, but may also re-enter the heat exchange plate 2 and other parts, affecting the heat exchange efficiency and normal operation of the equipment. By covering the end cover 6, the dust can be effectively controlled within a certain range, which is convenient for subsequent cleaning and treatment.

[0060] Example 2: Figure 5 As shown, both ends of the outer sleeve 3 extend out of the casing 1 , and the end of the outer sleeve 3 extending out of the casing 1 is connected to a detachable end cover 6 .

[0061] By adopting the above-mentioned technical solution, compared with the situation where one end is inside the casing 1, both ends of the outer sleeve 3 extend out of the casing 1, so that the dust in the outer sleeve 3 can be collected after the sealing ring 42 pushes it out, preventing the risk of secondary dust accumulation caused by re-entering the smoke channel.

[0062] Embodiment 3: The spacing between the sealing rings 42 is smaller than the spacing between two adjacent groups of first through holes 31 .

[0063] When the spacing between the sealing rings 42 is smaller than the spacing between two adjacent groups of first through holes 31, when the area between the sealing rings 42 is between two adjacent groups of first through holes 31, a certain high pressure can be accumulated in the space so that more stubborn dust can be cleaned, and it is also suitable for some plate-type air preheaters with better rigidity.

[0064] In addition to the above-mentioned preferred embodiments, the present application also has other implementation modes. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present application.

Claims

1. A sootblowing device for a plate-type air preheater, comprising a casing, wherein a plurality of heat exchange plates spaced apart in a front-to-rear direction are connected to the casing, and a flue gas channel is formed between two of the heat exchange plates, characterized in that: An outer sleeve penetrating the heat exchange plate is provided in the casing, and a plurality of first through holes connecting the flue gas channel and the interior of the outer sleeve are provided on the outer sleeve, and each group of the first through holes corresponds to each flue gas channel. An inner sleeve is provided in the outer sleeve, and the inner sleeve slides axially relative to the outer sleeve. A second through hole connecting the interior of the outer sleeve and the interior of the inner sleeve is provided on the inner sleeve, and sealing rings are provided on the inner sleeve at the front and rear sides of the second through holes. The inner ring of the sealing ring is fixedly sealed with the outer wall of the inner sleeve, and the outer ring of the sealing ring is slidingly sealed with the inner wall of the outer sleeve. The spacing between the sealing rings is less than or equal to the spacing between two adjacent groups of first through holes. One end of the inner sleeve is sealed, and the other end is connected with the medium pipe. An actuator for driving the inner sleeve to move forward and backward is provided outside the casing, so that the second through holes are connected with each group of first through holes in a one-to-one correspondence as the inner sleeve moves.

2. A sootblowing device for a plate-type air preheater according to claim 1, characterized in that: The actuator includes a motor, a first transmission mechanism, a second transmission mechanism and a third transmission mechanism. The motor is connected to the first transmission mechanism for transmitting power to the second transmission mechanism and the third transmission mechanism. The second transmission mechanism is connected to the outer sleeve to drive the outer sleeve to rotate. The third transmission mechanism is connected to the inner sleeve to drive the inner sleeve to move linearly.

3. A sootblowing device for a plate-type air preheater according to claim 2, characterized in that: When the single moving distance of the inner sleeve is the spacing between two adjacent groups of first through holes, the second transmission mechanism drives the outer sleeve to rotate greater than or equal to 360°.

4. A sootblowing device for a plate-type air preheater according to claim 1, characterized in that: The first through hole is a punched hole that is turned outwardly toward the smoke channel.

5. A sootblowing device for a plate-type air preheater according to claim 4, characterized in that: A plurality of the first through holes are arranged in a circle on the side wall of the outer sleeve, and the inclination angles of the first through holes in a group to the axis are different.

6. A sootblowing device for a plate-type air preheater according to claim 5, characterized in that: The inclination angle of the first through hole is 10°≤α≤170°.

7. A sootblowing device for a plate-type air preheater according to claim 1, characterized in that: The spacing between the sealing rings is the same as the spacing between two adjacent groups of first through holes; or the spacing between the sealing rings is smaller than the spacing between two adjacent groups of first through holes.

8. A sootblowing device for a plate-type air preheater according to claim 1, characterized in that: The heat exchange plate is formed by welding two front and rear thin plates through a plurality of welding parts, and the outer sleeve passes through the welding parts.

9. A sootblowing device for a plate-type air preheater according to claim 8, characterized in that: A plurality of the welding parts are provided with through holes, the through holes are evenly distributed in the up-down direction, and the outer sleeves are rotatably connected in the through holes.

10. A sootblowing device for a plate-type air preheater according to claim 1, characterized in that: One end of the outer sleeve extends into the casing and the other end extends out of the casing. The end face extending into the casing is open and connected to the smoke channel. When the sealing ring moves to the end face of the outer sleeve extending into the casing, there are gaps between the outer sleeve and the inner sleeve and the inner wall of the casing, or both ends of the outer sleeve extend out of the casing; a detachable end cover is connected to the end of the outer sleeve extending out of the casing.

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