A self-cleaning waste heat recovery device and burner

Abstract

The present invention provides a self-cleaning waste heat recovery device and burner, the waste heat recovery device includes a heat exchange plate, a heat exchange pipe, a ash cleaner and a push-pull cylinder; the push-pull cylinder includes: a cylinder body, a piston, a cylinder rod, a compression spring and a magnetic device; a fuel inlet pipe is arranged at one end of the cylinder body, a fuel outlet pipe is arranged at the other end, and magnetic devices are arranged at both ends of the cylinder body; the piston includes a piston body and a magnetic stopper; the compression spring can push the piston body to perform a reset movement; a third slide groove is provided in the piston body, and the magnetic stopper slides with the third slide groove; a through hole is provided between the two ends of the piston body, and the through hole intersects with the third slide groove; the magnetic stopper can slide to one end of the third slide groove under the action of the magnetic device away from one end of the compression spring, thereby blocking the through hole, and the magnetic stopper can slide to the other end of the third slide groove under the action of the magnetic device at the other end, thereby connecting the through hole. This device overcomes the defect that the existing waste heat recovery device requires additional power to perform the cleaning action.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery of combustion equipment, and in particular to a self-cleaning waste heat recovery device and a burner. Background Art

[0002] Waste heat refers to the sensible heat and latent heat that are not reasonably utilized in the original design of the energy-consuming devices of industrial enterprises that have been put into operation due to the limitations of historical, technical, and conceptual factors. It includes waste heat from high-temperature exhaust gas, waste heat from cooling media, waste heat from waste steam and waste water, waste heat from high-temperature products and slag, waste heat from chemical reactions, and waste heat from combustible waste gas, waste liquid, and waste materials. In the field of combustion equipment, waste heat mostly refers to the part of heat that is not fully utilized after the equipment is burned, and the most important of these is the waste heat from high-temperature exhaust gas. In order to improve energy utilization, equipment for recycling and reusing waste heat from high-temperature exhaust gas has been developed. Among them, plate heat exchangers have been widely used in the field of waste heat recovery because of their high heat exchange area. However, in addition to carrying waste heat, high-temperature exhaust gas often carries flue gas ash associated with combustion. Because the heat exchange surface of the waste heat recovery device is exposed to the flue gas, it will be gradually attached to the soot during operation, which will reduce the heat exchange efficiency of the heat exchange plate. Therefore, the waste heat recovery device needs to be cleaned in time. However, during the cleaning process, the existing cleaning device itself requires an additional power source to perform the cleaning action, so an additional power system has to be set up for the actuator, which increases the complexity of the entire equipment and increases the cost of operation and maintenance. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing waste heat recovery device requires additional power to perform the cleaning action, thereby increasing the overall complexity of the equipment.

[0004] In order to solve the above technical problems, the present application provides a self-cleaning waste heat recovery device, which includes: a heat exchange plate, a heat exchange pipe, a ash cleaner and a push-pull cylinder; the heat exchange pipe is heat-exchangeably connected to the heat exchange plate, and the ash cleaner scrapes the heat exchange plate under the drive of the push-pull cylinder;

[0005] The push-pull cylinder comprises: a cylinder body, a piston cylinder rod, a compression spring and a magnetic device; the cylinder rod passes through the cylinder body and the head end is connected to the ash cleaner; a fuel inlet pipe is arranged at one end of the cylinder body, and a fuel outlet pipe is arranged at the other end of the cylinder body, the fuel inlet pipe is connected to the input end of the external fuel delivery pipeline, and the fuel outlet pipe is connected to the output end of the external fuel delivery pipeline; magnetic devices are arranged at both ends of the cylinder body;

[0006] The piston comprises: a piston body and a magnetic stopper; the piston body is slidably matched with the cylinder body, one end of the piston body is connected with the tail end of the cylinder rod, a compression spring is arranged at the other end of the piston body, and the compression spring is suitable for pushing the piston body to perform a reset movement; a third slide groove is provided in the piston body, the direction of the third slide groove is perpendicular to the sliding direction of the piston body, and the magnetic stopper is slidably matched with the third slide groove; the magnetic pole direction of the magnetic stopper is the same as its own sliding direction; a through hole is provided between the two ends of the piston body, and the through hole and the third slide groove form an intersection; when the magnetic stopper slides to one end of the third slide groove, the through hole can be blocked, and when the magnetic stopper slides to the other end of the third slide groove, the through hole can be connected;

[0007] When the piston body moves to one end of the cylinder body away from the compression spring, the adjacent magnetic device can drive the magnetic stopper to slide to a position blocking the through hole; when the piston body moves to the other end of the cylinder body, the adjacent magnetic device can drive the magnetic stopper to slide to a position allowing the through hole to pass through.

[0008] Furthermore, a guide groove is provided in the third chute; the guide groove is provided along the entire length of the third chute and intersects with the through hole.

[0009] Furthermore, end plates are provided at both ends of the third slide groove, the end plates are arc-shaped, and the outer surfaces of the end plates are coplanar with the outer surface of the piston body; the two end surfaces of the magnetic stopper in the sliding direction have the same shape that can be fitted with the inner surfaces of the end plates on the corresponding sides; the guide groove is opened on the wall surface of the third slide groove close to the compression spring.

[0010] Furthermore, the piston body is made of non-ferromagnetic material; and the end plate is made of ferromagnetic material.

[0011] Furthermore, the width of the magnetic stopper is more than half of the diameter of the piston body; the through hole is a waist-shaped hole bent around the cylinder rod; and a plurality of guide grooves are arranged in parallel along the width direction of the third slide groove.

[0012] Furthermore, an accumulator is provided on the fuel discharge pipe.

[0013] A burner comprises a combustion head, a fuel delivery pipeline suitable for delivering fuel to the combustion head and the aforementioned self-cleaning waste heat recovery device; the input end of the fuel delivery pipeline is connected to a fuel inlet pipe, and the output end of the fuel delivery pipeline is connected to a fuel discharge pipe; the self-cleaning waste heat recovery device is distributed around the circumference of the combustion head; on the circumferential cross-section of the combustion head, the heat exchange plate is in a V-shaped structure, and the small end of the V-shaped structure of the heat exchange plate points to the combustion head.

[0014] Furthermore, the ash cleaner includes a scraper, a scraper bracket and a tension spring; the scraper bracket includes a bracket body connected to the cylinder rod and wing plates arranged on both sides of the bracket body, two wing plates are arranged in parallel on each side of the bracket body, a first slide groove is formed between the two wing plates on the same side, the scraper slides in cooperation with the first slide groove, the head end of the scraper is provided with a V-shaped opening adapted to the V-shaped structure of the hot plate, the wing plates on both sides of the bracket body together constitute a V-shaped structure suitable for supporting the V-shaped opening of the scraper, the tail end of the scraper extends out of the scraper bracket, and the tension spring is arranged between the scraper bracket and the tail end of the scraper.

[0015] Furthermore, the dust cleaner also includes a connecting plate, and the scraper includes two sub-scrapers that can together form a V-shaped opening of the scraper, the tail ends of the two sub-scrapers are connected to the connecting plate, and there is a space between the two sub-scrapers to accommodate a tension spring, and the tension spring is connected between the bracket body and the connecting plate.

[0016] Furthermore, it also includes a slide rail with a V-shaped cross-section, and the scraper bracket slides with the slide rail; the cylinder rod is located on the inner side of the V-shaped cross-section of the slide rail; the slide rail is arranged at the small end of the V-shaped structure of the heat exchange plate; the small end of the V-shaped structure of the heat exchange plate is a flat end structure; the wall surfaces on the same side of the slide rail and the heat exchange plate are coplanar, thereby forming a complete V shape.

[0017] By adopting the above technical solution, the present invention has the following technical effects:

[0018] The self-cleaning waste heat recovery device provided by the present invention is provided with a push-pull cylinder that is pushed by fuel and reset by a spring, and a valve mechanism containing a magnetic block is provided in the piston, and then cooperates with the magnetic devices provided at both ends of the cylinder body, so as to realize the use of unidirectional fuel flow to drive the push-pull cylinder to complete the reciprocating cleaning action in both directions, and the power of the cleaning device is only the fuel delivery pressure that must exist in the combustion device, and there is no need to add additional power facilities, which is conducive to simplifying the structure of the entire combustion system and reducing the complexity of the system. It is especially suitable for miniaturized equipment application scenarios with high requirements for compactness. While using the fuel delivery pressure to push the push-pull cylinder, the device will not block the fuel supply to the burner, so that online cleaning operations can be performed while the burner is working, and there is no need to wait for the combustion equipment to shut down before cleaning. It does not hinder the normal operation of the combustion equipment and improves the efficiency of the cleaning operation.

[0019] The burner provided by the invention, in addition to having the corresponding technical effects due to the above-mentioned waste heat recovery device, can also recover waste heat in an open combustion scenario, thereby improving the energy utilization rate of the combustion equipment in the corresponding scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic top view of the structure of a burner embodiment of the present invention;

[0022] Figure 2 It is a schematic front view of the structure of a burner embodiment of the present invention (only the waste heat recovery devices on the left and right sides are shown);

[0023] Figure 3 It is a schematic front view of the structure of an embodiment of the waste heat recovery device of the present invention (the push-pull cylinder and other related structures are not shown);

[0024] Figure 4 A schematic top cross-sectional view of the structure of an embodiment of a waste heat recovery device of the present invention;

[0025] Figure 5 It is a left side view showing the structure of the waste heat recovery device of the present invention;

[0026] Figure 6 It is a schematic front view of the structure of the scraper support of the present invention;

[0027] Figure 7 A schematic top view of the structure of the scraper support of the present invention;

[0028] Figure 8 A schematic top view of the related structure of the scraper and the scraper base of the present invention;

[0029] Fig. 9 It is a schematic front cross-sectional view of the structure of the piston of the present invention when the valve is closed;

[0030] Fig.10 for Fig. 9 Sectional view at AA in the middle;

[0031] Fig.11 This is a schematic front cross-sectional view of the structure of the piston of the present invention when the valve is open.

[0032] Description of reference numerals:

[0033] 1-slide rail, 2-heat exchange plate, 3-heat exchange pipe, 4-ash cleaner, 5-combustion head, 6-scraper, 7-scraper bracket, 8-tension spring, 9-connecting plate, 10-fuel inlet pipe, 11-cylinder body, 12-piston, 13-compression spring, 14-magnetic device, 15-cylinder rod, 16-accumulator, 17-fuel discharge pipe, 18-wing plate, 19-bracket body, 20-first slide groove, 21-second slide groove, 22-piston body, 23-through hole, 24-end plate, 25-magnetic stopper, 26-third slide groove, 27-guide groove. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted in the description of the present invention that the coordinate system used in this specification when describing the orientation is determined by the posture of the corresponding main view, and the naming of the observation angle of the corresponding view is also based on this. Therefore, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. in this specification indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Example 1

[0039] This embodiment provides a waste heat recovery device that can self-clean. Figures 3 to 11As shown, it includes a heat exchange plate 2, a heat exchange pipe 3, a dust cleaner 4 and a push-pull cylinder. The heat exchange pipe 3 is heat-exchangeably connected to the heat exchange plate 2. In this embodiment, only one heat exchange pipe 3 is shown for clarity of structure, but the number of heat exchange pipes 3 provided on each heat exchange plate 2 can be determined according to actual conditions. The dust cleaner 4 is suitable for scraping the heat exchange plate 2 under the drive of the push-pull cylinder.

[0040] The push-pull cylinder includes: a cylinder body 11, a piston 12, a cylinder rod 15, a compression spring 13 and a magnetic device 14. The cylinder rod 15 penetrates the cylinder body 11 and the head end is connected to the ash cleaner 4. A fuel inlet pipe 10 is provided at one end of the cylinder body 11, and a fuel outlet pipe 17 is provided at the other end of the cylinder body 11. In addition, magnetic devices 14 are also provided at both ends of the cylinder body 11. Although the magnetic device 14 can be an electromagnetic device, in order to simplify the energy supply system of the entire device, a permanent magnet should preferably be used. In order to reduce the damage to the permanent magnet caused by the heat that may exist around the cylinder body 11, it is also preferred to provide relevant heat insulation measures for the permanent magnet.

[0041] The piston 12 includes a piston body 22 and a magnetic stopper 25. The piston body 22 is slidably matched with the cylinder body 11, one end of the piston body 22 is connected to the tail end of the cylinder rod 15, and a compression spring 13 is arranged at the other end of the piston body 22, and the compression spring 13 is suitable for pushing the piston body 22 to perform a reset movement; a third slide groove 26 is provided in the piston body 22, and the direction of the third slide groove 26 is perpendicular to the sliding direction of the piston body 22, and the magnetic stopper 25 is slidably matched with the third slide groove 26; the magnetic pole direction of the magnetic stopper 25 is the same as its own sliding direction. A through hole 23 is provided between the two ends of the piston body 22, and the through hole 23 and the third slide groove 26 form an intersection. When the magnetic stopper 25 slides to one end of the third slide groove 26, the through hole 23 can be blocked, and when the magnetic stopper 25 slides to the other end of the third slide groove 26, the through hole 23 can be penetrated.

[0042] When the device is in use, the fuel inlet pipe 10 is first connected to the input end of the fuel delivery pipeline, and the fuel discharge pipe 17 is connected to the output end of the fuel delivery pipeline. The fuel delivery pipeline is a pipeline that delivers fuel to the burner. Because the fuel will inevitably have a certain pressure during delivery, it can be used as a power to drive the push-pull cylinder. The device can be connected to the fuel delivery pipeline in series or in parallel. It is preferred to use a parallel connection, because if the series connection is used, the push-pull cylinder will always work as long as the burner starts working. However, for the cleaning operation, it is not necessary to clean the ash all the time. Generally, it only needs to be performed once every period of time. Therefore, the parallel connection is used and the relevant valves are used. The fuel can be transported by the parallel bypass pipeline at ordinary times, and the push-pull cylinder can be powered when cleaning is needed. The flow rate of the push-pull cylinder can even be adjusted by the diverter valve, thereby adjusting the frequency of the cleaning operation.

[0043] Even if they are connected in series and there is no bypass line to supply fuel to the burner, the device will not block the fuel supply to the burner. Figure 5 and Figures 9 to 11 In the specific implementation mode, when the device is in the initial working state, the piston 12 should be located at the uppermost end of the cylinder 11 under the reset action of the compression spring 13, that is, the piston body 22 is located at the end of the cylinder 11 away from the compression spring 13, and Fig. 9 The magnetic pole of the middle magnetic stopper 25 is the N pole on the left and the S pole on the right, so the magnetic device 14 located above will attract the magnetic stopper 25 (of course, it can also be driven by magnetic repulsion depending on the situation), and finally drive the magnetic stopper 25 to slide to the right side of the piston, that is, Fig. 9 state, thereby blocking the through hole 23. In this state, when the burner is turned on, the fuel enters the cylinder 11 from the fuel inlet pipe 10 and pushes the piston 12 downward. If there is fuel that has flowed through the cylinder 11 before, the residual fuel on the back of the piston will be pushed to the fuel outlet pipe 17 and then reach the burner for combustion; if it is the first time to use, there is no fuel in the cylinder 11, and when the piston body 22 moves to the lower end of the cylinder 11, the magnetic device 14 at the lower end will attract the magnetic stopper 25 to slide to the left side of the piston, that is, Fig.11 The state shown in the figure makes the through hole 23 connected, and the fuel passes through the piston 12 and enters the fuel discharge pipe 17. At this time, because the fuel has a pressure relief passage, it loses the driving force on the piston 12, and the downward movement of the piston 12 compresses the compression spring 13, so that the compression spring 13 can perform a reset movement after the piston 12 loses the driving force of the fuel, and then pushes the piston 12 to move upward. Until the magnetic device 14 located above attracts the magnetic block 25 again to block the through hole 23, the action cycle of the push-pull cylinder is realized.

[0044] This device is provided with a push-pull cylinder that is pushed by fuel and reset by a spring, and a valve mechanism containing a magnetic stopper 25 is provided in the piston 12, and then cooperates with the magnetic device 14 provided at both ends of the cylinder body 11, so as to realize the use of unidirectional fuel flow to drive the push-pull cylinder to complete the reciprocating cleaning action in both directions, and the power of the cleaning device is only the fuel delivery pressure that must exist in the combustion device, and there is no need to add additional power facilities, which is conducive to simplifying the structure of the entire combustion system and reducing the complexity of the system. It is especially suitable for miniaturized application scenarios of equipment with high compactness requirements. While using the fuel delivery pressure to push the push-pull cylinder, the device will not block the fuel supply to the burner, so that online cleaning operations can be performed while the burner is working, and there is no need to wait for the combustion equipment to shut down before cleaning. It does not hinder the normal operation of the combustion equipment and improves the efficiency of the cleaning operation.

[0045] Based on the above implementation, in a preferred implementation, Figures 9 to 11As shown, a guide groove 27 is provided in the third chute 26; the guide groove 27 is arranged along the entire length of the third chute 26 and intersects with the through hole 23. This arrangement is because when the magnetic stopper 25 slides left and right in the piston body 22, a closed cavity is easily formed at the end of the third chute 26, especially at the end away from the through hole 23, which will hinder the movement of the magnetic stopper 25 because there is no release path for its internal pressure. Although if there is a certain amount of air in the closed cavity, the magnetic stopper 25 can be driven by a strong magnetic force to compress or relax the gas to achieve the movement of the magnetic stopper 25, but this requires the configuration of a very strong magnetic device 14, which increases the equipment cost. After the above-mentioned guide groove 27 is set, when the magnetic stopper 25 slides left and right, the fuel can enter or discharge the corresponding cavity through the guide groove 27 to avoid the formation of a closed cavity.

[0046] Based on the above implementation, in a preferred implementation, Figures 9 to 11 As shown, end plates 24 are provided at both ends of the third slide groove 26. The end plates 24 are arc-shaped, and the outer surfaces of the end plates 24 are coplanar with the outer surface of the piston body 22. The two end surfaces of the magnetic stopper 25 in the sliding direction have the same shape that can fit with the inner surface of the end plate 24 on the corresponding side. The guide groove 27 is provided on the wall surface of the third slide groove 26 close to the compression spring 13. The end plates 24 arranged in this way can provide the magnetic stopper 25 with as large a sliding distance as possible in the third slide groove 26, and then increase the size of the through hole 23 as the sliding range of the magnetic stopper 25 expands, which is ultimately beneficial to increase the flow rate of fuel through the piston 12 and ensure the fuel supply of the burner. In addition, after the magnetic stopper 25 moves to the corresponding side, it can fit with the corresponding inner surface of the end plate 24, so that the fuel originally located in this end cavity can be completely emptied, for example, from Figures 9 to 11 As for the change process, the fuel in the left cavity of the third chute 26 is squeezed out, and then the static pressure thrust on the left end face of the magnetic stopper 25 is lost. However, because there is a static pressure thrust generated by the fuel at the other end of the magnetic stopper 25, Fig.11The magnetic stopper 25 is pushed to the left as a whole, so that the magnetic stopper 25 can always be kept in the proper position to avoid its self-movement after being disturbed by external force, especially when the piston 12 slowly approaches the magnetic device 14, the magnetic stopper 25 will be attracted by the slowly increasing magnetic force and gradually displaced if it is not restrained. In this way, the stopper mechanism is equivalent to a valve that is slowly opened or closed, which not only makes the action of the push-pull cylinder not be executed in place, but also makes the pressure of the fuel unstable in a long time span, which is ultimately not conducive to the burner flame to maintain a stable shape and affects the combustion effect. The reason why the guide groove 27 is chosen to be opened on the wall surface of the third chute 26 close to the compression spring 13 is that this side is the relatively low-pressure side of the fuel flow, because the above-mentioned unilateral static pressure of the fuel is conducive to the magnetic stopper 25 to maintain its position, but it increases the magnetic strength requirement for driving the magnetic stopper 25 to move. The use of fuel on the low-pressure side can provide static pressure and appropriately reduce the requirement for high magnetic force.

[0047] Based on the above-mentioned embodiment, in a preferred embodiment, the piston body 22 is made of non-ferromagnetic material, such as plastic or ceramic; the end plate 24 is made of ferromagnetic material, such as iron and nickel. The piston body 22 is made of non-ferromagnetic material, which can avoid the problem of increased friction caused by the magnetic attraction of the magnetic stopper 25 on the piston body 22. In addition, although the aforementioned unilateral static pressure of the fuel can keep the magnetic stopper 25 in its position after movement, if the entire device is placed in a horizontal state due to the need of use, so that the magnetic stopper 25 moves vertically, the above-mentioned static pressure is often difficult to overcome the self-weight of the magnetic stopper 25, and thus additional positioning measures are required. If the end plate 24 is made of ferromagnetic material, suction will be generated after the magnetic stopper 25 moves to the adjacent position, thereby maintaining the position of the magnetic stopper 25. And because magnetic force is a force that decays rapidly with the square of the distance, a magnetizable end plate 24 is provided between the magnetic device 14 and the magnetic stopper 25, which is conducive to enhancing the magnetic attraction force on the magnetic stopper 25 and reducing the magnetic force requirements on the magnetic device 14. In addition, when the magnetic stopper 25 is attracted by the magnetic device 14 on the other side and leaves the end plate 24 on this side, the magnetic force decays rapidly with the distance, thereby achieving a slingshot-like effect, so that the magnetic stopper 25 that leaves the end plate 24 on this side and moves to the other side quickly completes the action, thereby improving the action execution speed of the valve body.

[0048] Based on the above implementation, in a preferred implementation, Fig.10As shown, the width of the magnetic stopper 25 is more than half of the diameter of the piston body 22; the through hole 23 is a waist-shaped hole bent around the cylinder rod 15; and multiple guide grooves 27 are arranged in parallel along the width direction of the third slide groove 26. The through holes 23 arranged in this way can maximize the flow cross-section and reduce the impact on the fuel flow. As the width of the magnetic stopper 25 increases, the cavity generated in the third slide groove 26 after the magnetic stopper 25 slides off also increases. If only a single guide groove 27 is used, on the one hand, the action speed of the magnetic stopper 25 may be reduced due to the small flow cross-section. On the other hand, when the fuel is filled from a single point into a wider cavity, the action speed of the magnetic stopper 25 will also be reduced due to the low filling rate. The above problems can be solved by setting multiple guide grooves 27 along the width, thereby improving the reaction and execution speed of the magnetic stopper 25.

[0049] Based on the above implementation, in a preferred implementation, Figure 5 As shown, an accumulator 16 is provided on the fuel discharge pipe 17. Although the present device can ensure the continuity of the fuel supply to the burner, in some cases, the fuel pressure may be unstable, which is particularly evident when the piston 12 is switched and the piston valve body is opened and closed. After the accumulator 16 is provided, when the fuel flow passage remains open, that is, when the piston 12 valve is open, the fuel will be replenished into the accumulator 16, and after the passage is closed, the fuel with normal pressure in the accumulator 16 will re-enter the fuel discharge pipe 17, thereby compensating for the fuel pressure loss and keeping the burner flame shape stable.

[0050] Example 2

[0051] This embodiment provides a burner such as Figure 1 and 2As shown, it includes a burner head 5, a fuel delivery pipeline suitable for delivering fuel to the burner head 5, and a self-cleaning waste heat recovery device of Example 1. The input end of the fuel delivery pipeline is connected to the fuel inlet pipe 10, and the output end of the fuel delivery pipeline is connected to the fuel discharge pipe 17; the self-cleaning waste heat recovery device is distributed around the circumference of the burner head 5. On the circumferential section of the burner head 5, the heat exchange plate 2 is in a V-shaped structure, and the small end of the V-shaped structure of the heat exchange plate 2 points to the burner head 5. In many combustion equipment, the burner itself is not provided with a waste heat recovery device, but the burner is located in the combustion chamber, and after the flue is connected, a waste heat recovery device is set in the flue, which is conducive to the centralized recovery of waste heat. However, for burners that do not have a closed combustion chamber and are in an open space for combustion, in order to improve fuel utilization, attention should also be paid to waste heat recovery. For burners used in an open environment, most of them are placed horizontally and the flame burns upward. In this way, the flame is blocked by the container to be heated above and spreads in all directions, and the hot air that is not fully utilized also spreads in all directions. Therefore, the device sets a waste heat recovery device around the burner head 5, so that the waste heat recovery device can not only serve as a support for the vessel, but also recover waste heat. Although the recovered waste heat is not as much as the centralized recovery, it can still be used for preheating fuel or air, thereby improving the overall combustion efficiency. The heat exchange plate 2 has a V-shaped structure with the tip facing the burner head 5, which can reduce the obstruction and disturbance of the flame shape and the hot air flow, ensuring that the flame always maintains an efficient heat exchange shape.

[0052] Based on the above implementation, in a preferred implementation, Figures 4 to 7As shown, the dust cleaner 4 includes a scraper 6, a scraper bracket 7 and a tension spring 8; the scraper bracket 7 includes a bracket body 19 connected to the cylinder rod 15 and wing plates 18 arranged on both sides of the bracket body 19, two wing plates 18 are arranged in parallel on each side of the bracket body 19, and a first slide groove 20 is formed between the two wing plates 18 on the same side. The scraper 6 slides in cooperation with the first slide groove 20, and the head end of the scraper 6 is provided with a V-shaped opening adapted to the V-shaped structure of the heat exchange plate 2. The wing plates 18 on both sides of the bracket body 19 together form a V-shaped structure suitable for supporting the V-shaped opening of the scraper 6. The tail end of the scraper 6 extends out of the scraper bracket 7, and the tension spring 8 is arranged between the scraper bracket 7 and the tail end of the scraper 6. Since the heat exchange plate 2 of the present device adopts a relatively unconventional V-shaped structure, how to effectively and efficiently clean the heat exchange plate 2 with a V-shaped structure becomes a problem. The dust cleaner 4 of the device is arranged as above, so that the scraper 6 with the same V-shaped opening is inserted and abutted from the small end to the large end of the heat exchange plate 2, and then the wall panels on both sides of the heat exchange plate 2 are cleaned at the same time, thereby improving the cleaning efficiency and simplifying the complexity of the mechanism. In addition, in order to ensure effective contact between the scraper 6 and the heat exchange plate 2, the scraper 6 is slidably matched with the bracket body 19, and a tension spring 8 is arranged between the scraper bracket 7 and the tail end of the scraper 6, so that the scraper 6 can always contact the wall panels on both sides of the heat exchange plate 2 under the tension of the tension spring 8, and even if the scraper 6 is worn, compensation can be formed under the continued pulling of the tension spring 8, thereby ensuring effective and long-term contact between the scraper 6 and the heat exchange plate 2, and avoiding the reduction of the dust cleaning effect due to poor contact.

[0053] Based on the above implementation, in a preferred implementation, Figure 5 and 8 As shown, the dust cleaner 4 also includes a connecting plate 9, and the scraper 6 includes two sub-scrapers with a V-shaped opening that can together form the scraper 6. The tail ends of the two sub-scrapers are connected to the connecting plate 9. There is a space between the two sub-scrapers to accommodate the tension spring 8, and the tension spring 8 is connected between the bracket body 19 and the connecting plate 9. After this arrangement, the two sub-scrapers are only connected by the relatively thin connecting plate 9, so that Figure 8 As shown, it has a certain degree of opening and closing deformation ability in the left and right directions. In this way, when manufacturing the scraper 6, the shape of its V-shaped opening is slightly sharper than the V-shape of the heat exchange plate 2. Therefore, after the scraper 6 contacts the heat exchange plate 2, the front end of the bevel of the sub-scraper will contact the heat exchange plate 2, and the rear end of the bevel of the sub-scraper will form a gap with the heat exchange plate 2. At this time, combined with the tension of the tension spring 8, the front end of the bevel of the sub-scraper forms a larger force arm on the connecting plate 9, thereby driving the connecting plate 9 to produce corresponding elastic deformation. From a comprehensive perspective of both sides, the V-shaped opening of the scraper 6 is slightly expanded, so that it can fit tightly with the V-shaped wall of the heat exchange plate 2, ensuring effective contact. In addition, the space between the two sub-scrapers can be used to accommodate the tension spring 8, so that Figure 5From the perspective of direction, the tension spring 8 and the scraper 6 are at the same horizontal position, which can reduce the overall thickness of the ash cleaner 4 and reduce its adverse effects on the flame shape and hot air flow when scraping ash.

[0054] Based on the above implementation, in a preferred implementation, Figures 1 to 7 As shown, the burner also includes a slide rail 1 with a V-shaped cross section, and the scraper bracket 7 slides with the slide rail 1 through a corresponding V-shaped second slide groove 21; the cylinder rod 15 is located on the inner side of the V-shaped cross section of the slide rail 1; the slide rail 1 is arranged at the small end of the V-shaped structure of the heat exchange plate 2; the small end of the V-shaped structure of the heat exchange plate 2 is a flat end structure; the wall surfaces on the same side of the slide rail 1 and the heat exchange plate 2 are coplanar, thereby forming a Figure 4 The complete V-shape with a pointed end is shown. Because the cylinder rod 15 is a relatively long component, there may be a certain degree of swing during the extension and retraction process, which is especially so when there is hot air around and the equipment is significantly affected by thermal expansion and contraction. If the swing amplitude of the cylinder rod 15 is too large, it may cause a gap in the contact between the scraper 6 at the head end and the heat exchange plate 2, which reduces the cleaning effect. The addition of the slide rail 1 can effectively fix the relative position between the scraper 6 and the heat exchange plate 2 to avoid poor contact caused by the swing of the slender rod. As a component around the heat exchange plate 2, the slide rail 1 will also interfere with the burner flame to a certain extent. Therefore, the slide rail 1 is made into a V shape and placed at the small end of the heat exchange plate 2, and the wall panels of the two are made coplanar to form a complete V shape, which can minimize the adverse effects of the addition of the slide rail 1 on the flame shape and hot air flow.

[0055] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A self-cleaning waste heat recovery device, characterized in that: include: A heat exchange plate (2), a heat exchange pipe (3), a dust cleaner (4) and a push-pull cylinder; the heat exchange pipe (3) is heat exchangeably connected to the heat exchange plate (2), and the dust cleaner (4) scrapes the heat exchange plate (2) under the drive of the push-pull cylinder; The push-pull cylinder comprises: a cylinder body (11), a piston (12), a cylinder rod (15), a compression spring (13) and a magnetic device (14); the cylinder rod (15) passes through the cylinder body (11) and the head end is connected to the ash cleaner (4); a fuel inlet pipe (10) is provided at one end of the cylinder body (11), and a fuel outlet pipe (17) is provided at the other end of the cylinder body (11); the fuel inlet pipe (10) is connected to the input end of an external fuel delivery pipeline, and the fuel outlet pipe (17) is connected to the output end of an external fuel delivery pipeline; magnetic devices (14) are provided at both ends of the cylinder body (11); The piston (12) comprises: a piston body (22) and a magnetic stopper (25); the piston body (22) is slidably matched with the cylinder body (11); one end of the piston body (22) is connected to the rear end of the cylinder rod (15); a compression spring (13) is arranged at the other end of the piston body (22); the compression spring (13) is suitable for pushing the piston body (22) to perform a reset movement; a third slide groove (26) is provided in the piston body (22); the direction of the third slide groove (26) is perpendicular to the piston body (22). In the sliding direction of the piston body (22), the magnetic stopper (25) and the third slide groove (26) are slidably matched; the magnetic pole direction of the magnetic stopper (25) is the same as its own sliding direction; a through hole (23) is provided between the two ends of the piston body (22), and the through hole (23) and the third slide groove (26) form an intersection; when the magnetic stopper (25) slides to one end of the third slide groove (26), the through hole (23) is blocked, and when the magnetic stopper (25) slides to the other end of the third slide groove (26), the through hole (23) is connected; When the piston body (22) moves to one end of the cylinder body (11) away from the compression spring (13), the adjacent magnetic device (14) can drive the magnetic block (25) to slide to a position blocking the through hole (23); when the piston body (22) moves to the other end of the cylinder body (11), the adjacent magnetic device (14) can drive the magnetic block (25) to slide to a position allowing the through hole (23) to penetrate.

2. The self-cleaning waste heat recovery device according to claim 1, characterized in that: A guide groove (27) is provided in the third slide groove (26); the guide groove (27) is arranged along the entire length of the third slide groove (26) and intersects with the through hole (23).

3. The self-cleaning waste heat recovery device according to claim 2, characterized in that: End plates (24) are provided at both ends of the third slide groove (26); the end plates (24) are arc-shaped, and the outer surface of the end plates (24) is coplanar with the outer surface of the piston body (22); the two end surfaces of the magnetic stopper (25) in the sliding direction have the same shape that can be fitted with the inner surface of the end plate (24) on the corresponding side; and the guide groove (27) is opened on the wall surface of the third slide groove (26) close to the compression spring (13).

4. The self-cleaning waste heat recovery device according to claim 3, characterized in that: The piston body (22) is made of non-ferromagnetic material; the end plate (24) is made of ferromagnetic material.

5. The self-cleaning waste heat recovery device according to claim 4, characterized in that: The width of the magnetic stopper (25) is greater than half the diameter of the piston body (22); the through hole (23) is a waist-shaped hole bent around the cylinder rod (15); and a plurality of guide grooves (27) are arranged in parallel along the width direction of the third slide groove (26).

6. The self-cleaning waste heat recovery device according to any one of claims 1 to 5, characterized in that: An accumulator (16) is arranged on the fuel discharge pipe (17).

7. A burner, characterized in that: It comprises a combustion head (5), a fuel delivery pipeline suitable for delivering fuel to the combustion head (5), and a self-cleaning waste heat recovery device as claimed in any one of claims 1 to 6; the input end of the fuel delivery pipeline is connected to a fuel inlet pipe (10), and the output end of the fuel delivery pipeline is connected to a fuel discharge pipe (17); the self-cleaning waste heat recovery device is distributed around the combustion head (5); on the circumferential cross-section of the combustion head (5), the heat exchange plate (2) is in a V-shaped structure, and the small end of the V-shaped structure of the heat exchange plate (2) points to the combustion head (5).

8. The burner according to claim 7, characterized in that The ash cleaner (4) comprises a scraper (6), a scraper bracket (7) and a tension spring (8); the scraper bracket (7) comprises a bracket body (19) connected to a cylinder rod (15) and wing plates (18) arranged on both sides of the bracket body (19); two wing plates (18) are arranged in parallel on each side of the bracket body (19); a first slide groove (20) is formed between the two wing plates (18) on the same side; the scraper (6) and the first slide groove (20) are slidably matched; a V-shaped opening matching the V-shaped structure of the heat exchange plate (2) is provided at the head end of the scraper (6); the wing plates (18) on both sides of the bracket body (19) jointly form a V-shaped structure suitable for supporting the V-shaped opening of the scraper (6); the tail end of the scraper (6) extends out of the scraper bracket (7); and the tension spring (8) is arranged between the scraper bracket (7) and the tail end of the scraper (6).

9. The burner according to claim 8, characterized in that The dust collector (4) further comprises a connecting plate (9), the scraper (6) comprises two sub-scrapers which can together form a V-shaped opening of the scraper (6), the tail ends of the two sub-scrapers are connected to the connecting plate (9), there is a space between the two sub-scrapers for accommodating a tension spring (8), and the tension spring (8) is connected between the bracket body (19) and the connecting plate (9).

10. The burner according to any one of claims 7 to 9, characterized in that: It also includes a slide rail (1) with a V-shaped cross section, a scraper bracket (7) and the slide rail (1) slidingly matched; the cylinder rod (15) is located on the inner side of the V-shaped cross section of the slide rail (1); the slide rail (1) is arranged at the small end of the V-shaped structure of the heat exchange plate (2); the small end of the V-shaped structure of the heat exchange plate (2) is a flat end structure; the wall surfaces on the same side of the slide rail (1) and the heat exchange plate (2) are coplanar, thereby forming a complete V shape.

Images