A kind of enameled corrugated plate type low temperature economizer deep waste heat recovery device

Abstract

The present invention relates to the technical field of flue gas low-temperature economizers, and in particular to a deep waste heat recovery device for an enameled corrugated plate type low-temperature economizer, comprising a frame, in which a plurality of corrugated plates for heat exchange are arranged, one end of the corrugated plate is connected to a water inlet pipe box and a drain pipe box through an upper end cover, and the end of the corrugated plate away from the upper end cover is fixedly connected to a lower end cover; a plurality of corrugated plates are arranged at equal intervals, and a gap for flue gas circulation is left between two adjacent corrugated plates, and a plurality of spacing sleeves are fixedly connected to the frame. The present invention can effectively reduce the resistance of flue gas flow by installing a plurality of corrugated plates in the frame, so that the flue gas can flow smoothly between two adjacent corrugated plates, and can effectively enhance the flow field of the flue gas.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas low-temperature economizers, and in particular to a deep waste heat recovery device for an enamel corrugated plate type low-temperature economizer. Background Art

[0002] A low-temperature economizer is a heat exchange device that uses the heat from the flue gas at the tail end of the boiler to heat condensate or heat medium water. Since it works in an area with lower flue gas temperature, it recovers the heat from the flue gas, reduces the exhaust gas temperature, and thus improves the boiler efficiency.

[0003] At present, the most commonly used waste heat recovery devices are finned tube low-temperature economizer and vacuum heat pipe low-temperature economizer. The finned tube low-temperature economizer has a poor flue gas flow field; while the vacuum heat pipe low-temperature economizer has a flue gas positive scouring of the cylinder, resulting in a reflux negative pressure area on the leeward side of the cylindrical tube, serious resistance drop, and the flue gas flow field is worse than that of the finned tube.

[0004] Therefore, there is an urgent need for an enameled corrugated plate low-temperature economizer deep waste heat recovery device that can effectively enhance the flow field of flue gas. Summary of the invention

[0005] The object of the present invention is to provide an enameled corrugated plate type low-temperature economizer deep waste heat recovery device to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following scheme: an enameled corrugated plate type low-temperature economizer deep waste heat recovery device, comprising a frame, in which a plurality of corrugated plates for heat exchange are arranged, one end of the corrugated plate is connected to a water inlet pipe box and a drain pipe box through an upper end cover, and the end of the corrugated plate away from the upper end cover is fixedly connected to a lower end cover; a plurality of the corrugated plates are arranged at equal intervals, and a gap for flue gas circulation is left between two adjacent corrugated plates, and a plurality of spacing sleeves are fixedly connected to the frame.

[0007] Preferably, the corrugated plate comprises an upper plate and a lower plate, and a plurality of water passage cavities interconnected with each other are formed on the upper plate and the lower plate through a plurality of welding points.

[0008] Preferably, the water passage cavity close to the water inlet pipe box is connected to the water inlet pipe box through a water inlet pipe.

[0009] Preferably, the water passage cavity close to the drainage pipe box is connected to the drainage pipe box through a drainage pipe.

[0010] Preferably, the upper plate is sealed to the lower plate at its periphery.

[0011] Preferably, the water inlet pipe box is arranged on the drainage pipe box.

[0012] Preferably, a plurality of welding rods are arranged on the corrugated plate, and two adjacent welding rods are staggered.

[0013] Preferably, a plurality of the welding rods are used to allow water to flow from the water inlet pipe along a plurality of the water passage cavities to the drain pipe.

[0014] Preferably, the outer surfaces of the upper plate and the lower plate are formed into a smooth arc shape by a plurality of the welding points.

[0015] Preferably, outer surfaces of the upper plate and the lower plate are coated with an enamel layer.

[0016] The present invention discloses the following technical effects:

[0017] The present invention can effectively reduce the resistance of smoke flow by installing a plurality of corrugated plates in the frame, so that the smoke can flow smoothly between two adjacent corrugated plates, and can effectively enhance the flow field of the smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a front view structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the corrugated plate of the present invention;

[0022] Figure 4 It is a schematic diagram of a partial cross-sectional structure of a corrugated plate of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the present invention when a baffle is installed;

[0024] Figure 6 This is a schematic diagram of the baffle structure of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the positioning block and the first positioning groove of the present invention;

[0026] Among them, 1. corrugated plate; 2. frame; 3. water inlet pipe box; 4. drainage pipe box; 5. upper end cover; 6. lower end cover; 7. wear plate; 8. distance sleeve; 11. upper plate; 12. lower plate; 13. welding point; 14. welding rod; 15. water inlet pipe; 16. drainage pipe; 17. water passage chamber; 21. cross bar; 22. baffle; 23. positioning block; 24. first positioning groove; 25. through hole; 61. long hole; 62. bolt. DETAILED DESCRIPTION

[0027] The possible implementation schemes found in the art are:

[0028] Patent announcement number CN216954081U discloses a low-temperature economizer using external enamel scroll tubes and heat pipes, including a box body, a scroll tube heat pipe, an inlet header, an outlet header, a casing, a middle partition, an inlet flue and an outlet flue. Several groups of heat pipes are connected to the inside of the box body, the inlet of the box body is connected to the inlet flue, the outlet of the box body is connected to the outlet flue, the heat pipes outside the box body are connected by the inside of the casing, and the two sides of the casing are respectively connected to the inlet header and the outlet header, and the middle partition is installed on the outside of the box body.

[0029] This patent applies an externally enameled scroll tube and a heat pipe type low-temperature economizer, and the scroll tube type heat pipe is configured to swing with the fluid sweeping outside the tube.

[0030] This patent applies to the externally enameled scroll tube and heat pipe type low-temperature economizer. The scroll tube type heat pipe adopts enamel coating on the outside of the tube, and is configured to adopt glass-lined coating on the outside of the tube.

[0031] This patent applies an externally enameled vortex tube and a heat pipe type low-temperature economizer. The heat pipe technology is used inside the casing, and a structure is set up to separate the flue gas side and the water side. A single heat pipe exchanges heat independently, and the gas side and the water side are separated, that is, a single heat pipe is perforated.

[0032] This patent can form a complete economizer structure, which has the effect of anti-corrosion and enhanced heat exchange. It is 1 / 4-1 / 3 smaller and lighter than ordinary light tube heat exchangers, and its service life is greatly extended, generally more than 5 years. It has the following effects: enhanced heat exchange; inorganic anti-corrosion and anti-wear; energy and water saving, safe and reliable.

[0033] The patent with the patent announcement number CN218097343U discloses a corrosion-resistant enameled heat pipe type low-temperature economizer, including: a flue gas receiving chamber, a heat exchange fluid receiving chamber, an insulation layer, an enameled heat pipe and a water jacket. Among them: the heat exchange fluid receiving chamber is fixed on the top surface of the flue gas receiving chamber, and the two are thermally isolated by the insulation layer. The enameled heat pipe is a pipe body arranged vertically and closed at both ends, its outer surface is covered with a layer of enamel, and the pipe body contains a heat exchange medium. The lower part of the enameled heat pipe is located in the flue gas receiving chamber, and the upper end of the enameled heat pipe is sealed through the flue gas receiving chamber and the insulation layer in sequence and then extends to the heat exchange fluid receiving chamber. The water jacket is located in the heat exchange fluid receiving chamber, and the water jacket is sealed and sleeved on the outer wall of the enameled heat pipe, and a cavity is formed between the two, so that the heat exchange fluid enters the water jacket to exchange heat with the enameled heat pipe.

[0034] Both the flue gas containing chamber and the heat exchange fluid containing chamber have an inlet and an outlet, and the inlet is located on the opposite side of the outlet, and the enameled heat pipe is located between the inlet and the outlet, so that the flue gas and the heat exchange fluid can exchange heat through the enameled heat pipe.

[0035] The heat insulation layer includes any one of polystyrene board, rock wool board, polyurethane foam board and the like.

[0036] The enameled heat pipe is in a vacuum state, which helps to accelerate the evaporation of the heat exchange medium, speed up heat exchange and improve heat exchange efficiency.

[0037] The thickness of the enamel layer is 0.3±0.05mm, which not only provides a continuous and reliable anti-corrosion effect, but also has little effect on the thermal resistance of heat exchange, ensuring high-efficiency heat transfer of the heat pipe.

[0038] The enamel layer is distributed only on the portion of the enameled heat pipe located in the flue gas receiving chamber.

[0039] The number of the enameled heat pipes is at least two, and the enameled heat pipes are arranged in parallel, so that after some of the enameled heat pipes are damaged, the other enameled heat pipes can continue to absorb the residual heat in the flue gas.

[0040] Sealing rings are arranged between the enameled heat pipe and the smoke containing cavity, the heat exchange fluid containing cavity and the insulation layer to prevent water and air leakage.

[0041] The width of the cavity between the water jacket and the outer wall of the enamel heat pipe is 20 to 35 cm, thereby increasing the pressure of the heat exchange fluid entering therein and improving the heat exchange efficiency.

[0042] The amount of the heat exchange medium is 30-50% of the inner cavity height of the part of the enamel heat pipe in the smoke containing cavity.

[0043] The patented corrosion-resistant enameled heat pipe type low-temperature economizer uses enameled heat pipes to separate flue gas from heat exchange medium. Since the enameled heat pipe uses phase change heat transfer, the required heat exchange medium reserve is small. Even if the enameled heat pipe is broken and leaked due to long-term scouring of flue gas, only the heat exchange medium in the pipe leaks into the flue gas. Since the amount of heat exchange medium is very small, it is quickly discharged with the flue gas and will not cause too much impact on the exhaust pipe. Moreover, since the surface of the enameled heat pipe also has an enamel layer, it has the advantages of wear resistance and corrosion resistance, making the patented enameled heat pipe difficult to be corroded by flue gas. In addition, since the enamel layer is not easy to accumulate dust, the patented enameled heat pipe is more resistant to fly ash wear, which greatly avoids the leakage problem of the enameled heat pipe.

[0044] The patented corrosion-resistant enamel heat pipe type low-temperature economizer also has a water jacket sleeved on the upper part of the enamel heat pipe, so that the heat exchange fluid first enters the heat exchange fluid receiving cavity and then enters the water jacket, which can effectively increase the pressure of the heat exchange fluid in the water jacket and improve the heat exchange efficiency. At the same time, it can also prevent the enamel heat pipe from being directly impacted by the heat exchange fluid entering the heat exchange fluid receiving cavity, thereby improving the stability of the enamel heat pipe.

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Reference Figure 1-Figure 5 The present invention provides an enameled corrugated plate type low-temperature economizer deep waste heat recovery device, comprising a frame 2, in which a plurality of corrugated plates 1 for heat exchange are arranged, one end of the corrugated plate 1 is connected to a water inlet pipe box 3 and a water discharge pipe box 4 through an upper end cover 5, and one end of the corrugated plate 1 away from the upper end cover 5 is fixedly connected to a lower end cover 6; the plurality of corrugated plates 1 are arranged at equal intervals, and a gap for smoke circulation is left between two adjacent corrugated plates 1, and a plurality of spacing sleeves 8 are fixedly connected to the frame 2.

[0048] The spacing between two adjacent corrugated plates 1 can be made the same by using a plurality of spacing sleeves 8 , thereby preventing the corrugated plates 1 from being deformed due to being too long, thereby preventing the flue gas from flowing along the gaps between the adjacent corrugated plates 1 .

[0049] The present invention can effectively reduce the resistance of smoke flow by installing a plurality of corrugated plates 1 in the frame 2, so that the smoke can flow smoothly between two adjacent corrugated plates 1, and can effectively enhance the flow field of the smoke.

[0050] According to a further optimized solution, the corrugated plate 1 includes an upper plate 11 and a lower plate 12, and a plurality of interconnected water passage chambers 17 are formed on the upper plate 11 and the lower plate 12 through a plurality of welding points 13. Water enters the water passage chamber 17 to exchange heat with the flue gas.

[0051] The upper plate 11 and the lower plate 12 are welded by a numerically controlled laser welding machine to form a plurality of welding points 13 that are equally spaced and staggered. Then, by blowing high-pressure gas between the upper plate 11 and the lower plate 12, a plurality of smooth arcs are formed around the welding points 13, and a plurality of water passage cavities 17 are formed between the upper plate 11 and the lower plate 12; at the same time, the water passage cavities 17 can also be made elliptical, which effectively increases the heat exchange area.

[0052] CNC laser welding machine is a kind of laser welding equipment controlled by computer programming. It can complete various welding methods such as automatic or semi-automatic spot welding, butt welding, lap welding, sealing welding, etc. It can realize complex plane straight line, arc and arbitrary trajectory welding.

[0053] The working principle of CNC laser welding machine is to use high-energy laser pulses to locally heat the material in a small area. The energy of laser radiation diffuses into the interior of the material through heat conduction, melting the material to form a specific molten pool. This welding method is mainly used for welding thin-walled materials and precision parts. It has the advantages of high aspect ratio, small weld width, small heat-affected zone, small deformation, fast welding speed, smooth and beautiful weld, no need for treatment or only simple treatment after welding, and high weld quality.

[0054] With the rapid development of Industry 4.0 and intelligent manufacturing, the intelligence level of laser welding machines is also constantly improving. Modern laser welding machines are usually equipped with high-precision CNC systems that can automatically plan welding paths and achieve precise welding of complex shapes. At the same time, through the built-in intelligent control system, parameters such as laser power and welding speed can be adjusted in real time to ensure the appropriate welding effect. In addition, the multi-axis linkage system enables the laser welding machine to move freely in three-dimensional space to adapt to various complex welding needs.

[0055] In a further optimized solution, the water passage cavity 17 near the water inlet pipe box 3 is connected to the water inlet pipe box 3 through the water inlet pipe 15. Water can enter the water inlet pipe 15 on each corrugated plate 1 through the water inlet pipe box 3, and water enters the water passage cavity 17 through the water inlet pipe 15.

[0056] In a further optimized solution, the water passage chamber 17 near the drainage pipe box 4 is connected to the drainage pipe box 4 through the drainage pipe 16. Through the drainage pipe box 4, the water in each corrugated plate 1 can flow into the drainage pipe box 4 through the drainage pipe 16.

[0057] Water circulates in the corrugated plate 1 through the water inlet pipe box 3 and the water discharge pipe box 4 .

[0058] Further optimization scheme, the upper plate 11 and the lower plate 12 are sealed and connected at their peripheries. That is, the peripheries of the upper plate 11 and the lower plate 12 are welded by a CNC laser welding machine, so that the peripheries of the upper plate 11 and the lower plate 12 can be effectively sealed and connected to avoid water leakage.

[0059] In a further optimized solution, the water inlet pipe box 3 is arranged on the drainage pipe box 4. That is, the water inlet pipe box 3 is arranged on the side of the windward end of the corrugated plate 1, and the drainage pipe box 4 is arranged on the side of the windward end of the corrugated plate 1, so that water forms in the corrugated plate 1 and flows from the windward end of the corrugated plate 1 to the windward end of the corrugated plate 1.

[0060] Further optimization scheme, a plurality of welding rods 14 are arranged on the corrugated plate 1, and two adjacent welding rods 14 are arranged in a staggered manner. By arranging a plurality of welding rods 14, the welding points 13 on the same straight line are welded and connected to form a water flow path, referring to Figure 3 A plurality of welding electrodes 14 are provided.

[0061] Further optimizing the scheme, a plurality of welding rods 14 are used to make water flow from the water inlet pipe 15 along a plurality of water passage chambers 17 to the drain pipe 16. The water inlet pipe box 3 and the drain pipe box 4 can be arranged on the same side, effectively reducing the floor space and the overall volume.

[0062] The scheme is further optimized, and the outer surfaces of the upper plate 11 and the lower plate 12 are formed into a smooth arc through a plurality of welding points 13. The smooth arc can effectively reduce the resistance of the smoke flow and reduce the disturbance of the smoke, and can effectively enhance the flow field of the smoke, which not only increases the heat recovered by the smoke, but also reduces the temperature of the smoke exhaust.

[0063] According to a further optimized solution, the outer surfaces of the upper plate 11 and the lower plate 12 are coated with an enamel layer.

[0064] The enamel layer is a composite material formed by melting and solidifying an inorganic glassy material on a base metal. It can be firmly bonded to the metal and is resistant to erosion, wear and corrosion.

[0065] At the same time, the enamel layer can protect the base metal from corrosion and increase its service life in corrosive environments; the smooth surface of the enamel layer helps to reduce airflow resistance and can reduce dust adhesion on it, effectively improving heat transfer efficiency; the enamel layer not only has high hardness characteristics, reducing dust erosion and wear; the enamel layer also has good thermal stability and can maintain stable heat transfer performance when the temperature changes.

[0066] In order to improve the heat transfer coefficient of the enamel layer, a medium with good thermal conductivity is used to make the enamel layer.

[0067] Working process:

[0068] The whole of the present invention is installed in the flue, and the water inlet pipe box 3 is connected with the water supply pipe, and the drainage pipe box 4 is connected with the water outlet pipe. Water flows from the water inlet pipe box 3 into the water inlet pipe 15, and the water flows into the water chamber 17 through the water inlet pipe 15. The water in the water chamber 17 flows to the drainage pipe 16 along the path formed by the welding rod 14, and vertically passes through the drainage pipe 16 to enter the drainage pipe box 4. The water in the drainage pipe box 4 flows into the water outlet pipe, forming a water circulation. When the smoke flows through the gap between two adjacent corrugated plates 1, the smoke can flow along the smooth arc formed by the outer surface of the water chamber 17. The smooth arc can effectively reduce the resistance to the smoke flow, reduce the disturbance to the smoke, and effectively enhance the flow field of the smoke, which not only increases the heat recovered by the smoke, but also reduces the temperature of the smoke exhaust.

[0069] Embodiment 2

[0070] The difference between this embodiment and the first embodiment is that, since the flue gas contains a large amount of dust, in order to avoid damage to the windward end of the corrugated plate 1 and extend the service life of the corrugated plate 1, the corrugated plate 1 needs to be protected at the air inlet end. In order to protect the service life of the windward end of the corrugated plate 1, an anti-wear plate 7 is installed on the windward end of the corrugated plate 1. The anti-wear plate 7 is sleeved on the windward end of the corrugated plate 1, so that the dust in the flue gas impacts the anti-wear plate 7, which effectively avoids damage to the windward end of the corrugated plate 1 caused by the dust in the flue gas, and can effectively improve the service life of the windward end of the corrugated plate 1.

[0071] Embodiment 3

[0072] Reference Figure 5-Figure 6The difference between this embodiment and the first embodiment is that, since the enamel layer is easily damaged by bumps during transportation and installation, the corrugated plate 1 needs to be protected during transportation and installation. In order to prevent hard particles from falling into the gap between two adjacent corrugated plates 1, causing scratches on the enamel layer on the surface of the corrugated plate 1, affecting the service life and heat exchange efficiency of the corrugated plate 1, two adjacent horizontal plates on the frame 2 are respectively provided with slide grooves on opposite sides, and a plurality of baffles 22 are slidably connected in the slide grooves. The baffles 22 are slidably connected with elongated holes 61, which are provided on the lower end cover 6, and the elongated holes 61 are connected with the slide grooves. By inserting the baffle 22 into the elongated holes 61 and pushing the baffle 22, the baffle 22 enters the slide groove through the elongated holes 61, and then the next baffle 22 is inserted into the elongated holes 61, and the baffle 22 drives the previous baffle 22 to move. The plate 22 moves along the slide groove. When the last baffle plate 22 is inserted into the long hole 61, the end of the last baffle plate 22 away from the previous baffle plate 22 is flush with the long hole 61. At this time, a plurality of bolts 62 are threadedly connected to the circumference of the lower end cover 6. The end of the bolt 62 extending into the long hole 61 is slidably connected to the through hole 25. The through hole 25 is opened on the last baffle plate 22. The bolt 62 penetrates the through hole 25, so that the last baffle plate 22 can effectively limit the previous baffle plate 22 to prevent the baffle plate 22 from moving. By installing the baffle plates 22 on each surface of the frame 2, the enamel layer of the corrugated plates 1 on both sides can be effectively prevented from being collided through the baffle plates 22. At the same time, it can also effectively prevent hard particles from falling into the gap between two adjacent corrugated plates 1. The baffle plates 22 can effectively protect the corrugated plates 1 from being damaged during transportation and lifting.

[0073] Embodiment 4

[0074] Reference Figure 7The difference between this embodiment and the third embodiment is that, in order to prevent adjacent baffles 22 from being dislocated due to collision and causing the baffles 22 to collide with the corrugated plate 1, one end of the baffle 22 is fixedly connected with a plurality of positioning blocks 23, and the end of the baffle 22 away from the positioning blocks 23 is provided with a plurality of first positioning grooves 24, and the positioning blocks 23 are arranged in a one-to-one correspondence with the first positioning grooves 24, and a plurality of second positioning grooves are provided on the end of the upper end cover 5 facing the baffle 22, and the second positioning grooves are arranged in a one-to-one correspondence with the positioning blocks 23, and through the connection of two adjacent baffles 22, that is, the positioning block 23 of the first installed baffle 22 is inserted into In the second positioning groove on the upper end cover 5, the positioning block 23 of the next baffle 22 is inserted into the first positioning groove 23 on the previous baffle 22, and the two adjacent baffles 22 are connected in sequence through the positioning blocks 23 and the first positioning grooves 24. When any baffle 22 is hit, the positioning blocks 23 are limited by the first positioning grooves 24 or the second positioning grooves, which effectively avoids the baffle 22 from hitting the corrugated plate 1, so that the baffle 22 can effectively protect the corrugated plate 1 during transportation and installation, and effectively avoids the damage caused by the collision of the corrugated plate 1 with the baffle 22.

[0075] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 should not be understood as a limitation on the present invention.

[0076] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An enamel corrugated plate type low-temperature economizer deep waste heat recovery device, characterized in that: It comprises a frame (2), wherein a plurality of corrugated plates (1) for heat exchange are arranged in the frame (2), one end of the corrugated plate (1) is connected to a water inlet pipe box (3) and a water discharge pipe box (4) via an upper end cover (5), and one end of the corrugated plate (1) away from the upper end cover (5) is fixedly connected to a lower end cover (6); A plurality of the corrugated plates (1) are arranged at equal intervals, and a gap for smoke circulation is left between two adjacent corrugated plates (1). A plurality of spacing sleeves (8) are fixedly connected to the frame (2).

2. The enamel corrugated plate type low-temperature economizer deep waste heat recovery device according to claim 1 is characterized by: The corrugated plate (1) comprises an upper plate (11) and a lower plate (12), and a plurality of water passage cavities (17) which are interconnected are formed on the upper plate (11) and the lower plate (12) through a plurality of welding points (13).

3. The enamel corrugated plate type low-temperature economizer deep waste heat recovery device according to claim 2 is characterized by: The water passage chamber (17) close to the water inlet pipe box (3) is connected to the water inlet pipe box (3) through a water inlet pipe (15).

4. The enamel corrugated plate type low-temperature economizer deep waste heat recovery device according to claim 2 is characterized by: The water passage chamber (17) close to the drainage pipe box (4) is connected to the drainage pipe box (4) through a drainage pipe (16).

5. The enamel corrugated plate type low-temperature economizer deep waste heat recovery device according to claim 2 is characterized by: The upper plate (11) and the lower plate (12) are sealed at their peripheries.

6. The enamel corrugated plate type low-temperature economizer deep waste heat recovery device according to claim 1, characterized in that: The water inlet pipe box (3) is arranged on the water discharge pipe box (4).

7. The enamel corrugated plate type low-temperature economizer deep waste heat recovery device according to claim 2 is characterized by: A plurality of welding rods (14) are arranged on the corrugated plate (1), and two adjacent welding rods (14) are arranged in a staggered manner.

8. The enamel corrugated plate type low-temperature economizer deep waste heat recovery device according to claim 7, characterized in that: The plurality of welding rods (14) allow water to flow from the water inlet pipe (15) along the plurality of water passage chambers (17) toward the drain pipe (16).

9. The enamel corrugated plate type low-temperature economizer deep waste heat recovery device according to claim 7, characterized in that: The outer surfaces of the upper plate (11) and the lower plate (12) are formed into a smooth arc shape through a plurality of welding points (13).

10. The enamel corrugated plate type low-temperature economizer deep waste heat recovery device according to claim 7, characterized in that: The outer surfaces of the upper plate (11) and the lower plate (12) are coated with an enamel layer.

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