Low-nitrogen alcohol combustor waste heat exchange equipment and working method thereof

Abstract

The present application relates to burner waste heat utilization technical field, particularly relates to a kind of low nitrogen alcohol burner waste heat heat exchange equipment and working method thereof. Including outer tube, first heat exchange unit and second heat exchange unit are equipped in the outer tube, second water storage tank is communicated on the output end of the outer tube;The second water storage tank includes outer box, first heating cavity is equipped in the outer box.The present application utilizes back wave board fan annular structure to make water flow tumbling, so that water flow position at center and edge is exchanged.Upgrade secondary heating uniformity.After first heating mechanism is heated, water flow is shunted again, a part enters first water cavity, and the rest enters second heating cavity and is further heat exchanged using second medium tube quantity more second heating mechanism. So that cold water can be shunted and heat exchanged at different temperatures without artificial transportation, so as to enrich the functionality of the device.

Description

Technical Field

[0001] This invention belongs to the field of waste heat utilization technology of burners, and specifically relates to a waste heat exchange device for low-nitrogen alcohol burners and its working method. Background Technology

[0002] The characteristic of low-NOx alcohol burners is that they increase energy utilization and reduce unnecessary waste by using other auxiliary equipment, while also reducing the residual heat of low-NOx alcohol burners.

[0003] A search revealed a patent document with citation number CN211650217U, published on October 9, 2020, entitled "Burner and its Environmentally Friendly Low-NOx Alcohol Fuel Combustion Heat Exchange Device." This document includes a fan, a fuel mixer, and a burner nozzle. The fuel mixer contains a fuel mixing chamber. A fuel nozzle is fixedly installed on the fuel mixer, positioned on the inner wall of the mixing chamber. The fuel inlet end of the fuel nozzle is connected to an inlet pipe, which is connected to a booster pump. The fan is connected to one end of the fuel mixing chamber. The above embodiment uses methanol / ethanol as fuel, which is cheaper than natural gas and produces fewer harmful gases and substances after combustion, thus improving environmental performance.

[0004] However, the above embodiments still have the following drawbacks:

[0005] The temperature of the waste heat carrier is fixed after the heat exchange, making it impossible to freely adjust the carrier temperature as needed. This also prevents multi-level heat exchange and diversion at different temperatures, resulting in a limited functionality of the device. Furthermore, the heat conduction mechanism in the above embodiment has a simple structure and short contact time with cold water, leading to reduced heating effect and heating uniformity. Summary of the Invention

[0006] To address the above problems, the present invention provides a waste heat exchange device for a low-nitrogen alcohol burner, comprising an outer tube, wherein a first heat exchange unit and a second heat exchange unit are provided inside the outer tube, and a second water storage tank is connected to the output end of the outer tube.

[0007] The second water storage tank includes an outer casing, inside which is a first heating chamber. Below the first heating chamber is a second heating chamber. The first heating chamber and the second heating chamber are respectively equipped with a first heating mechanism and a second heating mechanism. The first heating mechanism includes an upper corrugated heating plate and a lower corrugated heating plate. Both the upper and lower corrugated heating plates are inclined and together form a sealed cavity. Several sets of return plates are evenly distributed between the upper and lower corrugated heating plates. Several sets of second medium pipes are provided inside the return plates, the upper corrugated heating plates, and the lower corrugated heating plates.

[0008] The second heating mechanism has the same structure as the first heating mechanism, but the second heating mechanism has more second medium tubes than the first heating mechanism; both the first heating cavity and the second heating cavity are connected to the output end of the outer casing.

[0009] Furthermore, a cavity is formed inside the outer tube, and an inner tube is provided inside the cavity. The central axis of the inner tube coincides with that of the outer tube. A heat storage device is provided on the side of the outer tube away from the first drain outlet.

[0010] Both the first heat exchange unit and the second heat exchange unit are located inside the inner tube.

[0011] Furthermore, a water receiving unit is installed on the outer pipe; the water receiving unit includes a ring pipe, which is sleeved on the outer wall of the outer pipe, and the ring pipe is located at the edge of the outer pipe near the heat storage device, and the ring pipe coincides with the central axis of the outer pipe.

[0012] Furthermore, the top of the ring pipe is provided with a water inlet pipe; several sets of water delivery pipes are distributed in a ring array on the inner wall of the ring pipe, and the other end of the water delivery pipe extends into the cavity of the inner pipe.

[0013] Furthermore, the first heat exchange unit includes a central rod, which is horizontally arranged on the central axis of the inner tube. Several sets of guide plates are arranged at equal intervals along a spiral path on the central rod. Each set of guide plates has a heat exchange groove on the side wall away from the central rod. Both ends of the heat exchange groove are open structures. A first medium pipe is provided inside the guide plate. The input end of the first medium pipe is connected to the output end of the heat storage device.

[0014] Furthermore, the second heat exchange unit includes a spiral baffle plate, which has a spiral structure and its central axis coincides with the central rod. Several sets of partition plates are arranged at equal intervals along the spiral path on the spiral baffle plate. One side wall of each partition plate is connected to the inner wall of the inner tube, and several diversion channels are arranged at equal intervals along the length of the other side wall. Each diversion channel is composed of two sets of extension plates and one set of diversion plates with a fan-shaped cross-section in side view. Each set of diversion channels is equipped with a diversion heating mechanism.

[0015] Furthermore, the flow-diverting heating mechanism includes several sets of outer crescent tubes, which are arranged at equal intervals along the vertical direction on the inner wall of the flow-diverting channel near the partition plate. Each set of outer crescent tubes has a set of inner crescent tubes on the side away from the partition plate.

[0016] Furthermore, several sets of vertical tubes are arranged at equal intervals in the horizontal direction between two adjacent sets of outer crescent tubes and between two adjacent sets of inner crescent tubes; each set of outer crescent tubes is connected to a set of inner crescent tubes at the same height by several sets of horizontal tubes, and the several sets of horizontal tubes at the same height are arranged at equal intervals in the horizontal direction; each set of outer crescent tubes is connected to an inner crescent tube at an adjacent height by a set of inclined tubes.

[0017] Furthermore, a heat-conducting unit is provided inside the cavity; the heat-conducting unit includes several sets of outer rings evenly distributed along the horizontal direction, and an inner ring is provided on the central axis of each set of outer rings; each set of outer rings is connected to a corresponding set of inner rings by several sets of double-ring pipes, and several sets of intermediate pipes are connected between adjacent sets of outer rings and adjacent sets of inner rings; a heat inlet pipe is connected between the set of outer rings closest to the heat storage device and the output end of the heat storage device.

[0018] A method for operating a waste heat exchange device for a low-nitrogen alcohol burner, the method comprising:

[0019] Inject cold water into the outer pipe;

[0020] The heat medium flows into the first heat exchange unit and the second heat exchange unit;

[0021] Cold water flows along a spiral path. The cold water on the side closer to the inner wall of the outer tube comes into contact with the second heat exchange unit, while the cold water on the side closer to the central axis of the outer tube comes into contact with the first heat exchange unit, and heat exchange occurs to obtain primary heated water.

[0022] After the primary heating water is diverted, a portion enters the second water storage tank;

[0023] The primary heated water entering the second water tank flows into the sealed cavity between the upper corrugated heating plate and the lower corrugated heating plate, flows along the corrugated path, and comes into contact with the heat medium of the upper corrugated heating plate, the lower corrugated heating plate and the return plate for secondary heat exchange.

[0024] The water flow tumbles along the circular path of the wave plate, swapping the positions of the water flow at the center and the water flow at the edge.

[0025] After the water flows into contact with each set of wave return plates, it enters the first heating chamber.

[0026] The water flow is split again, with one portion used for storage and the remainder entering the second heating chamber for further heating.

[0027] The beneficial effects of this invention are:

[0028] 1. Utilizing the corrugated structure of the upper and lower corrugated heating plates, the contact time between the primary heating water and the heat medium is extended. Upon contact with the return plate, its fan-shaped structure causes the water flow to tumble, thus exchanging the positions of the water flow at the center and edges. This improves the uniformity of secondary heating. After heating by the first heating mechanism, the water flow is again divided; part enters the first water-forming chamber, and the remainder enters the second heating chamber for further heat exchange using the second heating mechanism, which has a larger number of second medium pipes. This allows cold water to be divided and exchanged at different temperatures without manual transport, thus enriching the functionality of the device.

[0029] 2. After entering the inner tube, the cold water moves along the spiral path of the spiral baffles. While the flow-dividing heating mechanism on each set of partitions exchanges heat with the cold water near the inner wall of the inner tube, the cold water near the central rod contacts each set of guide plates. Utilizing the spiral distribution of the guide plates, the water flow within the inner tube always follows the path of the spiral baffles, ensuring smooth water flow. Simultaneously, the first medium pipe in the heat exchange tank heats the cold water away from the inner tube, increasing the contact area between the heat medium and the cold water and improving the heating effect of the primary heat exchange.

[0030] 3. As the cold water moves along the spiral path of the spiral baffle, the cold water near the inner wall of the inner tube flows evenly through the equally spaced distribution channels on the baffle plate and comes into contact with the distribution heating mechanism. This mechanism is a three-dimensional frame structure composed of outer crescent tubes, inner crescent tubes, horizontal tubes, vertical tubes, and inclined tubes. Therefore, regardless of how the cold water flows and tumbles within the distribution channels, it can exchange heat with the heat medium. Furthermore, after being split, the narrower channels accelerate the water flow. This improves both the quality of heat exchange and the flow velocity of the cold water.

[0031] 4. The inner diameter of the water passage near the water inlet end should be larger than that of the other end to prevent backflow of water during tumbling, thereby reducing the impact of water flow on the inner wall of the first heating chamber and thus reducing device shaking and operating noise caused by water flow impact.

[0032] 5. Cold water enters the ring pipe through the inlet pipe, and then enters each group of water delivery pipes. Finally, the water delivery pipes distributed in the ring array are evenly delivered to the inner pipe from different directions. This not only speeds up the delivery of cold water, but also ensures that the flow rate of cold water does not slow down due to excessive concentration.

[0033] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of the structure of a heat exchange device according to an embodiment of the present invention is shown.

[0036] Figure 2 A schematic cross-sectional view of the port of the outer tube according to an embodiment of the present invention is shown.

[0037] Figure 3 A cross-sectional schematic diagram of the outer tube according to an embodiment of the present invention is shown.

[0038] Figure 4 A schematic diagram of the structure of a first heat exchange unit according to an embodiment of the present invention is shown.

[0039] Figure 5 A schematic diagram of the structure of a second heat exchange unit according to an embodiment of the present invention is shown.

[0040] Figure 6 A schematic diagram showing the connection between the spacer and the flow channels of each component according to an embodiment of the present invention is shown.

[0041] Figure 7 A schematic diagram of the structure of the flow-diverting heating mechanism according to an embodiment of the present invention is shown.

[0042] Figure 8 A schematic diagram of the structure of a heat-conducting unit according to an embodiment of the present invention is shown.

[0043] Figure 9 A schematic diagram of the structure of the second water storage tank according to an embodiment of the present invention is shown.

[0044] Figure 10 A cross-sectional schematic diagram of a second water storage tank according to an embodiment of the present invention is shown.

[0045] Figure 11 A schematic diagram of the structure of a first heating mechanism according to an embodiment of the present invention is shown.

[0046] In the diagram: 100, outer pipe; 110, cavity; 120, inner pipe; 130, first drain outlet; 140, second drain outlet; 200, heat storage device; 300, water receiving unit; 310, ring pipe; 320, water inlet pipe; 330, water delivery pipe; 400, first heat exchange unit; 410, central rod; 420, guide plate; 430, heat exchange tank; 500, second heat exchange unit; 510, spiral baffle plate; 520, partition plate; 530, extension plate; 540, flow divider plate; 550, outer crescent tube; 560, inner crescent tube; 570, horizontal pipe; 580, vertical pipe; 590, inclined pipe; 600, heat conduction unit; 610, outer ring; 620 630. Inner ring; 640. Double ring connector; 650. Intermediate pipe; 700. Heat inlet pipe; 800. First water storage tank; 800. Second water storage tank; 810. Outer casing; 811. First heating chamber; 812. Second heating chamber; 813. First water-forming chamber; 814. Connecting water pipe; 815. Water-forming and delivery pipe; 816. Second water-forming chamber; 820. First heating mechanism; 821. Upper corrugated heating plate; 822. Lower corrugated heating plate; 823. Water inlet end; 824. Water outlet end; 825. Reflector plate; 826. Water passage hole; 830. First terminal pipe; 840. Second heating mechanism; 850. Second terminal pipe; 860. Guide water pipe; 870. Water outlet valve. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] This invention provides a waste heat exchange device for a low-nitrogen alcohol burner, exemplarily, such as... Figure 1 , Figure 2 and Figure 3 As shown, the device includes an outer tube 100, a cavity 110 inside the outer tube 100, and an inner tube 120 inside the cavity 110. The central axis of the inner tube 120 coincides with that of the outer tube 100. One end of the inner tube 120 has a first drain outlet 130 and a second drain outlet 140, and a set of first electric ball valves are respectively provided on the first drain outlet 130 and the second drain outlet 140.

[0049] A heat storage device 200 is provided on the side of the outer pipe 100 away from the first drain outlet 130. The model of the heat storage device 200 is, but is not limited to, SC133A1-AGT-03.

[0050] A water receiving unit 300 is installed on the outer pipe 100, and the output end of the water receiving unit 300 is connected to the cavity of the inner pipe 120. The water receiving unit 300 is used to transport external cold water to the inner pipe 120.

[0051] A first heat exchange unit 400 is provided on the central axis of the inner tube 120. A second heat exchange unit 500 is provided on the inner wall of the inner tube 120. Both the first heat exchange unit 400 and the second heat exchange unit 500 are connected to the output end of the heat storage device 200. Both the first heat exchange unit 400 and the second heat exchange unit 500 are used to perform a primary heat exchange operation on the cold water.

[0052] A heat-conducting unit 600 is provided inside the cavity 110. The input end of the heat-conducting unit 600 is connected to the heat storage device 200, and the output end of the heat-conducting unit 600 is connected to the first heat exchange unit 400 and the second heat exchange unit 500, respectively. The heat-conducting unit 600 is used to transport the heat medium to the first heat exchange unit 400 and the second heat exchange unit 500.

[0053] A first water storage tank 700 is connected to the first drain outlet 130, and a second water storage tank 800 is connected to the second drain outlet 140. The second water storage tank 800 is used for secondary heating of hot water.

[0054] For example, such as Figure 2 As shown, the water receiving unit 300 includes a ring pipe 310, which is sleeved on the outer wall of the outer pipe 100. The ring pipe 310 is located at one end edge of the outer pipe 100 near the heat storage device 200, and the central axis of the ring pipe 310 coincides with that of the outer pipe 100. A water inlet pipe 320 is provided at the top of the ring pipe 310. Several sets of water delivery pipes 330 are arranged in a ring array on the inner wall of the ring pipe 310, and the other end of the water delivery pipes 330 extends into the cavity of the inner pipe 120.

[0055] Cold water enters the ring pipe 310 through the inlet pipe 320, and then enters each group of water delivery pipes 330. Finally, the water delivery pipes 330 distributed in a ring array are evenly delivered to the inner pipe from different directions, which not only speeds up the delivery of cold water, but also ensures the uniformity of contact between cold water and heat medium.

[0056] For example, such as Figure 4As shown, the first heat exchange unit 400 includes a central rod 410, which is horizontally arranged on the central axis of the inner tube 120. Several sets of guide plates 420 are arranged at equal intervals along a spiral path on the central rod 410. Each set of guide plates 420 has a set of heat exchange grooves 430 on the side wall away from the central rod 410. Both ends of the heat exchange grooves 430 are open structures. A first medium pipe is provided inside the guide plate 420. The input end of the first medium pipe is connected to the output end of the heat conduction unit 600 and the heat storage device 200.

[0057] For example, such as Figure 5 and Figure 6 As shown, the second heat exchange unit 500 includes a spiral baffle 510, which has a spiral structure and whose central axis coincides with the central rod 410. Several sets of spacer plates 520 are arranged at equal intervals along the spiral path of the spiral baffle 510. One side wall of each spacer plate 520 is connected to the inner wall of the inner tube 120, and several diversion channels are arranged at equal intervals along the length of the other side wall. Each diversion channel is composed of two sets of extension plates 530 and one set of diversion plates 540 with a fan-shaped cross-section in side view. Each set of diversion channels is equipped with a diversion heating mechanism.

[0058] For example, such as Figure 7 As shown, the flow-dividing heating mechanism includes several sets of outer crescent tubes 550. These sets of outer crescent tubes 550 are arranged at equal intervals along the vertical direction on the inner wall of the flow-dividing channel near the partition plate 520. Each set of outer crescent tubes 550 has a set of inner crescent tubes 560 on the side away from the partition plate 520. Several sets of vertical tubes 580 are arranged at equal intervals along the horizontal direction between adjacent sets of outer crescent tubes 550 and between adjacent sets of inner crescent tubes 560. Each set of outer crescent tubes 550 is connected to a set of inner crescent tubes 560 at the same height by several sets of horizontal tubes 570, which are arranged at equal intervals along the horizontal direction. Each set of outer crescent tubes 550 is connected to an inner crescent tube 560 at an adjacent height by a set of inclined tubes 590.

[0059] After entering the inner tube 120, the cold water moves along the spiral path of the spiral baffle 510. While the flow-dividing heating mechanism on each set of partition plates 520 exchanges heat with the cold water near the inner wall of the inner tube 120, the cold water near the central rod 410 contacts each set of guide plates 420. Utilizing the spiral distribution of the guide plates 420, the water flow within the inner tube 120 always follows the path of the spiral baffle 510, ensuring smooth water flow. Simultaneously, the first medium pipe within the heat exchange tank 430 heats the cold water away from the inner tube 120, increasing the contact area between the heat medium and the cold water and improving the heating effect of the primary heat exchange.

[0060] As the cold water moves along the spiral path of the spiral baffle 510, the cold water near the inner wall of the inner tube 120 flows evenly through the equally spaced distribution channels on the partition plate 520 and comes into contact with the distribution heating mechanism. This distribution heating mechanism is a three-dimensional frame structure composed of outer crescent tubes 550, inner crescent tubes 560, horizontal tubes 570, vertical tubes 580, and inclined tubes 590. Therefore, regardless of how the cold water flows and tumbles within the distribution channels, it can exchange heat with the heat medium. Furthermore, after being split, the narrower channels accelerate the water flow. This improves both the quality of heat exchange and the flow velocity of the cold water.

[0061] For example, such as Figure 8 As shown, the heat-conducting unit 600 includes several sets of outer rings 610 evenly spaced along the horizontal direction, and each set of outer rings 610 has an inner ring 620 on its central axis. Each set of outer rings 610 is connected to a corresponding set of inner rings 620 by several sets of double-ring pipes 630, and several sets of intermediate pipes 640 are connected between adjacent sets of outer rings 610 and adjacent sets of inner rings 620. A heat inlet pipe 650 is connected between the set of outer rings 610 closest to the heat storage device 200 and the output end of the heat storage device 200.

[0062] The heat transfer medium first enters the cylindrical three-dimensional frame composed of outer rings 610, inner rings 620, double-ring connectors 630, and intermediate pipes 640 through the heat storage device 200. This three-dimensional frame then evenly distributes the heat transfer medium to the first heat exchange unit 400 and the second heat exchange unit 500. Because the environmentally friendly low-NOx alcohol burner has a high thermal energy utilization rate, the waste heat is reduced, resulting in a decrease in the waste heat storage within the heat storage device 200. Therefore, when the burner is idle and cannot further increase waste heat, the waste heat in the heat storage device 200 cannot support heat exchange operations for an extended period. The heat transfer medium within the three-dimensional pipe frame of the heat conduction unit 600 can then store additional heat energy after the heat storage device 200, thereby extending the heat exchange time. This improves the compatibility of the device with the environmentally friendly low-NOx alcohol burner.

[0063] For example, such as Figure 9 and Figure 10As shown, the second water storage tank 800 includes an outer casing 810. A water guide pipe 860 is connected to the input end of the outer casing 810, and the input end of the water guide pipe 860 is connected to a second drain outlet 140. A first heating chamber 811 is formed inside the outer casing 810, and a second heating chamber 812 is located directly below the first heating chamber 811. A water supply pipe 815 is connected to one side of each of the first and second heating chambers 811 and 812, respectively. The other ends of the two water supply pipes 815 are connected to a first water-forming chamber 813 and a second water-forming chamber 816, respectively. Each of the two water supply pipes 815 is equipped with a second electric ball valve. A first terminal pipe 830 and a second terminal pipe 850 are connected to the first water-forming chamber 813 and the second water-forming chamber 816, respectively. A third electric ball valve is installed inside each of the first terminal pipe 830 and the second terminal pipe 850. A water outlet valve 870 is provided on one side wall of the outer casing 810, and the output ends of the first terminal pipe 830 and the second terminal pipe 850 are both connected to the water outlet valve 870.

[0064] For example, the first heating chamber 811 is provided with a first heating mechanism 820, and the input end of the first heating mechanism 820 is connected to the output end of the water guide pipe 860.

[0065] For example, such as Figure 11 As shown, the first heating mechanism 820 includes an upper corrugated heating plate 821 and a lower corrugated heating plate 822. Both the upper corrugated heating plate 821 and the lower corrugated heating plate 822 have a corrugated structure, and their sidewalls are tightly fitted to the inner walls of the first heating cavity 811. The upper corrugated heating plate 821 and the lower corrugated heating plate 822 are inclined, and the two sets together form a sealed cavity. The higher end of the sealed cavity has a water inlet 823, and the lower end has a water outlet 824. Several sets of wave-return plates 825 are evenly distributed between the upper corrugated heating plate 821 and the lower corrugated heating plate 822. The side view of the wave-return plate 825 is a fan-shaped structure, and the upper and lower ends of the wave-return plate 825 are respectively installed on the upper corrugated heating plate 821 and the lower corrugated heating plate 822. The wave plate 825 has several sets of water passage holes 826 evenly distributed on it. The inner diameter of the water passage hole 826 near the water inlet end 823 is larger than that of the other end.

[0066] For example, the second heating chamber 812 is provided with a second heating mechanism 840, the structure of the second heating mechanism 840 is the same as that of the first heating mechanism 820, and a connecting water pipe 814 is connected between the water inlet 823 of the second heating mechanism 840 and the first heating chamber 811, and a fourth electric ball valve is provided in the connecting water pipe 814.

[0067] Furthermore, the corrugated plate 825, the upper corrugated heating plate 821 and the lower corrugated heating plate 822 are each provided with a number of second medium tubes, and the number of second medium tubes in the second heating mechanism 840 is greater than the number of second medium tubes in the first heating mechanism 820.

[0068] Preferably, the second water storage tank 800 may further include a third heating chamber, a fourth heating chamber, etc. Here, the first heating chamber 811 and the second heating chamber 812 are selected as preferred embodiments.

[0069] The primary heated water, after being heated by the first heat exchange unit 400 and the second heat exchange unit 500, enters the first water storage tank 700 and the second water storage tank 800 respectively through the first drain outlet 130 and the second drain outlet 140. The primary heated water in the first water storage tank 700 first enters the sealed cavity formed by the upper corrugated heating plate 821 and the lower corrugated heating plate 822, and flows towards the outlet 824 along its inclined direction. During the flow, the corrugated structure of the upper and lower corrugated heating plates 821 and 822 allows for a longer contact time between the primary heated water and the heat medium. Upon contact with the return plate 825, its fan-shaped structure causes the water flow to tumble, thus exchanging the positions of the water flow at the center and the edge. Furthermore, the larger inner diameter of the water passage 826 near the water inlet 823 prevents backflow during turbulence, thus reducing the impact of the water flow on the inner wall of the first heating chamber 811. This improves the uniformity of secondary heating while reducing noise caused by impact. After heating by the first heating mechanism 820, the water flow is split again, with one portion entering the first water-forming chamber 813 and the remainder entering the second heating chamber 812 for further heat exchange using the second heating mechanism 840, which has more second medium pipes. This allows cold water to be split and exchanged at different temperatures without manual transport, thereby enriching the functionality of the device.

[0070] Based on the aforementioned waste heat exchange device for a low-nitrogen alcohol burner, this embodiment of the invention also proposes a working method for the heat exchange device. Exemplarily, the working method includes:

[0071] Cold water enters into groups of water supply pipes arranged in a ring array, and then is evenly injected into the inner pipe from different directions by each group of water supply pipes;

[0072] The heat medium in the heat storage device flows to the first heat exchange unit and the second heat exchange unit via the heat conduction unit;

[0073] Cold water flows along the spiral path of the spiral baffle. The cold water on the side closer to the inner wall of the inner tube comes into contact with the second heat exchange unit, and the cold water on the side closer to the central axis of the inner tube comes into contact with the first heat exchange unit, and heat exchange occurs to obtain primary heated water.

[0074] The heated water is diverted through the first drain outlet and the second drain outlet to enter the first water storage tank and the second water storage tank respectively;

[0075] The primary heated water entering the second water tank flows into the sealed cavity between the upper corrugated heating plate and the lower corrugated heating plate, flows along the corrugated path, and comes into contact with the heat medium of the upper corrugated heating plate, the lower corrugated heating plate and the return plate for secondary heat exchange.

[0076] The water flow tumbles along the circular path of the wave plate, swapping the positions of the water flow at the center and the water flow at the edge.

[0077] After the water flows into contact with each set of wave return plates, it enters the first heating chamber.

[0078] The water flow is split again, with one portion used for storage and the remainder entering the second heating chamber for further heating.

[0079] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste heat exchange device for a low-nitrogen alcohol burner, comprising an outer tube (100), wherein a first heat exchange unit (400) and a second heat exchange unit (500) are provided inside the outer tube (100), characterized in that: The output end of the outer pipe (100) is connected to a second water storage tank (800). The second water storage tank (800) includes an outer casing (810), a first heating chamber (811) is provided inside the outer casing (810), a second heating chamber (812) is provided below the first heating chamber (811), a first heating mechanism (820) and a second heating mechanism (840) are respectively provided in the first heating chamber (811) and the second heating chamber (812), the first heating mechanism (820) includes an upper corrugated heating plate (821) and a lower corrugated heating plate (822), the upper corrugated heating plate (821) and the lower corrugated heating plate (822) are both inclined and together form a sealed cavity; a number of sets of return plates (825) are evenly distributed between the upper corrugated heating plate (821) and the lower corrugated heating plate (822), and a number of sets of second medium pipes are provided in the return plates (825), the upper corrugated heating plate (821) and the lower corrugated heating plate (822); The second heating mechanism (840) has the same structure as the first heating mechanism (820), but the second heating mechanism (840) has more second medium tubes than the first heating mechanism (820); the first heating chamber (811) and the second heating chamber (812) are both connected to the output end of the outer casing (810); The outer tube (100) has a cavity (110) inside, and an inner tube (120) is provided inside the cavity (110). The central axis of the inner tube (120) coincides with that of the outer tube (100). A heat storage device (200) is provided on the side of the outer tube (100) away from the first drain outlet (130). Both the first heat exchange unit (400) and the second heat exchange unit (500) are located in the inner tube; The first heat exchange unit (400) includes a central rod (410), which is horizontally arranged on the central axis of the inner tube (120). Several sets of guide plates (420) are arranged at equal intervals along a spiral path on the central rod (410). Each set of guide plates (420) has a set of heat exchange grooves (430) on the side wall away from the central rod (410). Both ends of the heat exchange grooves (430) are open structures. A first medium pipe is provided inside the guide plate (420). The input end of the first medium pipe is connected to the output end of the heat storage device (200). The second heat exchange unit (500) includes a spiral baffle (510), which has a spiral structure and its central axis coincides with the central rod (410). Several sets of partition plates (520) are arranged at equal intervals along the spiral path of the spiral baffle (510). One side wall of the partition plate (520) is connected to the inner wall of the inner tube (120), and several sets of diversion channels are arranged at equal intervals along the length direction of the other side wall. The diversion channel is composed of two sets of extension plates (530) and a set of diversion plates (540) with a fan-shaped cross section in side view. Each set of diversion channels is provided with a diversion heating mechanism.

2. The waste heat exchange device for a low-nitrogen alcohol burner according to claim 1, characterized in that: A water receiving unit (300) is installed on the outer pipe (100); the water receiving unit (300) includes a ring pipe (310), which is sleeved on the outer wall of the outer pipe (100). The ring pipe (310) is located at one end edge of the outer pipe (100) near the heat storage device (200), and the ring pipe (310) coincides with the central axis of the outer pipe (100).

3. The waste heat exchange device for a low-nitrogen alcohol burner according to claim 2, characterized in that: The top of the ring pipe (310) is provided with a water inlet pipe (320); a number of water delivery pipes (330) are arranged in a ring array on the inner wall of the ring pipe (310), and the other end of the water delivery pipe (330) extends into the cavity of the inner pipe (120).

4. The waste heat exchange device for a low-nitrogen alcohol burner according to claim 1, characterized in that: The diversion heating mechanism includes several sets of outer crescent tubes (550). The several sets of outer crescent tubes (550) are arranged at equal intervals in the vertical direction on the inner wall of the diversion channel near the partition plate (520). Each set of outer crescent tubes (550) has a set of inner crescent tubes (560) on the side away from the partition plate (520).

5. The waste heat exchange device for a low-nitrogen alcohol burner according to claim 4, characterized in that: Between two adjacent sets of outer crescent tubes (550) and between two adjacent sets of inner crescent tubes (560), several sets of vertical tubes (580) are arranged at equal intervals in the horizontal direction; each set of outer crescent tubes (550) is connected to a set of inner crescent tubes (560) at the same height by several sets of horizontal tubes (570), and the several sets of horizontal tubes (570) at the same height are arranged at equal intervals in the horizontal direction; each set of outer crescent tubes (550) is connected to an inner crescent tube (560) at an adjacent height by a set of inclined tubes (590).

6. The waste heat exchange device for a low-nitrogen alcohol burner according to claim 1, characterized in that: The cavity (110) is provided with a heat-conducting unit (600); the heat-conducting unit (600) includes several sets of outer rings (610) evenly distributed in the horizontal direction, and each set of outer rings (610) has a set of inner rings (620) on its central axis; each set of outer rings (610) is connected to a corresponding set of inner rings (620) by several sets of double-ring pipes (630), and several sets of intermediate pipes (640) are connected between adjacent sets of outer rings (610) and adjacent sets of inner rings (620); a set of outer rings (610) near the heat storage device (200) is connected to the output end of the heat storage device (200) by a heat inlet pipe (650).

7. A method of operating the waste heat exchange device of the low-nitrogen alcohol burner according to any one of claims 1-6, characterized in that: The working method includes: Inject cold water into the outer pipe; The heat medium flows into the first heat exchange unit and the second heat exchange unit; Cold water flows along a spiral path. The cold water on the side closer to the inner wall of the outer tube comes into contact with the second heat exchange unit, while the cold water on the side closer to the central axis of the outer tube comes into contact with the first heat exchange unit, and heat exchange occurs to obtain primary heated water. After the primary heating water is diverted, a portion enters the second water storage tank; The primary heated water entering the second water tank flows into the sealed cavity between the upper corrugated heating plate and the lower corrugated heating plate, flows along the corrugated path, and comes into contact with the heat medium of the upper corrugated heating plate, the lower corrugated heating plate and the return plate for secondary heat exchange. The water flow tumbles along the circular path of the wave plate, swapping the positions of the water flow at the center and the water flow at the edge. After the water flows into contact with each set of wave return plates, it enters the first heating chamber. The water flow is split again, with one portion used for storage and the remainder entering the second heating chamber for further heating.

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