Boiler waste heat recovery device

Abstract

The utility model discloses a boiler waste heat recovery device which relates to the technical field of waste heat recovery and comprises a box body and an exhaust pipe, the exhaust pipe is arranged in the box body in a penetrating mode, a cooling pipe is arranged in the box body and wraps the outer wall of the exhaust pipe, and cooling liquid is contained in the cooling pipe. The bottom of the cooling pipe is connected with a backflow pipe, the two ends of the cooling pipe are communicated through the backflow pipe, a one-way valve is arranged in the end, close to an air inlet of the exhaust pipe, of the backflow pipe, and a cooling agent is arranged at the bottom of the box body. According to the boiler waste heat recovery device, the cooling pipe is arranged, so that gas in the exhaust pipe is cooled, and damage to the exhaust pipe due to the fact that cooling liquid makes direct contact with the exhaust pipe is reduced; the backflow pipe is arranged and immersed in the cooling agent, so that cooling and recycling of the cooling liquid are achieved; and by arranging the one-way valve, the cooling liquid can only flow from the air outlet end to the air inlet end.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler waste heat recovery technical field especially relates to a boiler waste heat recovery device. BACKGROUND

[0002] With the continuous expansion of industrial production scale, the total amount of waste heat generated in the industrial process is also increasing, and a large amount of waste heat directly discharged into the environment will not only cause waste of energy, but also cause heat pollution to the environment, therefore, the demand for waste heat recovery in the industrial field is increasingly urgent, which promotes the development of waste heat recovery device.

[0003] The waste heat recovery device usually utilizes the principle of heat exchange to transfer the heat in high-temperature exhaust gas, waste water or other waste heat carriers to the working medium.

[0004] However, in the prior art, the exhaust pipe directly contacts the coolant, and the exhaust pipe is easily damaged and deteriorated after a long time, therefore, a boiler waste heat recovery device is proposed. UTILITY MODEL CONTENT

[0005] In view of the problem that the exhaust pipe directly contacts the coolant and is easily damaged and deteriorated after a long time, the utility model is proposed.

[0006] To solve the above technical problems, the utility model provides the following technical scheme: a boiler waste heat recovery device, which comprises a box body and an exhaust pipe, the exhaust pipe is arranged in the box body and penetrates the box body, a cooling pipe is arranged in the box body, the cooling pipe is wrapped on the outer wall of the exhaust pipe, the cooling pipe contains a coolant, the bottom of the cooling pipe is connected with a reflux pipe, the two ends of the cooling pipe are communicated through the reflux pipe, a one-way valve is arranged in the end of the reflux pipe close to the air inlet of the exhaust pipe, and a cooling agent is arranged at the bottom of the box body.

[0007] Preferably, the exhaust pipe and the cooling pipe are arranged in an inverted Z shape.

[0008] Preferably, the reflux pipe is immersed in the cooling agent.

[0009] Preferably, the one-way valve comprises a fixed plate, a cavity, a liquid inlet plate, a door plate, a control ball and a spring, the top outer wall of the cavity is sleeved with the fixed plate, the bottom outer wall of the cavity is sleeved with the liquid inlet plate, the spring is arranged in the cavity, one end of the spring is connected with the door plate, the other end of the spring is provided with the control ball, and the top and bottom of the cavity are respectively provided with a top hole and a bottom hole.

[0010] Preferably, the diameter of the door plate is greater than the inner diameter of the cavity.

[0011] Preferably, the diameter of the control ball is greater than the diameter of the bottom hole.

[0012] Preferably, a tapered hole with a small end and a large end is arranged in the liquid inlet plate, the small end of the tapered hole is smaller than the outer diameter of the cavity and larger than the outer diameter of the bottom of the cavity.

[0013] Preferably, a dust removal pad is arranged on the inner wall of the gas inlet end of the exhaust pipe, a water removal pad is arranged on the side of the dust removal pad close to the inner wall of the box, and a water removal pad is arranged on one end of the gas outlet of the exhaust pipe.

[0014] Preferably, the top of the box is provided with a heat removal pipe.

[0015] The beneficial effects of the present application are as follows:

[0016] 1. The cooling pipe is arranged to cool the gas in the exhaust pipe, reducing the damage of the exhaust pipe caused by direct contact of the cooling liquid with the exhaust pipe.

[0017] 2. The backflow pipe is arranged to realize the circulation of the cooling liquid.

[0018] 3. The backflow pipe is immersed in the cooling agent to realize the cooling of the cooling liquid.

[0019] 4. The one-way valve is arranged to allow the cooling liquid to flow from the gas outlet end to the gas inlet end. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor. Among them:

[0021] Figure 1 It is a structural schematic diagram of the boiler waste heat recovery device.

[0022] Figure 2 It is a front view of the boiler waste heat recovery device.

[0023] Figure 3 It is a sectional view of the boiler waste heat recovery device.

[0024] Figure 4 It is Figure 3 the enlarged view of A in the middle.

[0025] Figure 5 It is Figure 3 the enlarged view of B in the middle.

[0026] MARKING OF DRAWINGS:

[0027] 1. Housing; 2. Exhaust pipe; 3. Cooling pipe; 4. Return pipe; 5. One-way valve; 51. Fixing plate; 52. Cavity; 53. Liquid inlet plate; 54. Door panel; 55. Control ball; 56. Spring; 6. Dust removal pad; 7. Water removal pad; 8. Heat exhaust pipe. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Reference Figures 1-5 This invention provides a boiler waste heat recovery device, which includes a housing 1 and an exhaust pipe 2. The exhaust pipe 2 is located inside the housing 1 and penetrates the housing 1. A cooling pipe 3 is installed inside the housing 1 and is wrapped around the outer wall of the exhaust pipe 2. The cooling pipe 3 contains coolant. A return pipe 4 is connected to the bottom of the cooling pipe 3. The two ends of the cooling pipe 3 are connected through the return pipe 4. A one-way valve 5 is installed inside the end of the return pipe 4 near the air inlet of the exhaust pipe 2. A cooling agent is installed at the bottom of the housing 1.

[0030] A dust removal pad 6 is provided on the inner wall of the air inlet end of the exhaust pipe 2. A water removal pad 7 is provided on the side of the dust removal pad 6 near the inner wall of the housing 1. This avoids the blockage of the exhaust pipe 2 and improves the dryness of the gas in the exhaust pipe 2. A water removal pad 7 is provided at one end of the air outlet of the exhaust pipe 2, which improves the dryness of the gas discharged from the exhaust pipe 2.

[0031] The exhaust pipe 2 and the cooling pipe 3 are arranged in an inverted Z shape, that is, the upper edge of the air inlet is lower than the lower edge of the air outlet, and the middle is a pipe transition section.

[0032] The return pipe 4 is arranged in a C-shape with the opening facing upwards. The side of the return pipe 4 near the air inlet of the exhaust pipe 2 is lower than the side of the return pipe 4 near the air outlet. The middle part of the return pipe 4 is immersed in the cooling agent.

[0033] It is understandable that the different heights of the two inlets of the return pipe 4 will cause the liquid to flow from the side with the higher liquid level to the side with the lower liquid level, that is, the coolant flows from the side closer to the air outlet to the side closer to the air inlet.

[0034] The one-way valve 5 comprises a fixed plate 51, a cavity 52, an inlet plate 53, a door plate 54, a control ball 55 and a spring 56; the lower part of the cavity 52 is in the shape of a circular truncated cone, the small part of the circular truncated cone is the bottom of the cavity 52, and the top and bottom of the cavity 52 are respectively provided with a top hole and a bottom hole; the outer wall of the top of the cavity 52 is sleeved with the fixed plate 51, and the outer wall of the bottom of the cavity 52 is sleeved with the inlet plate 53, and the middle of the inlet plate 53 is provided with a tapered hole with a small end and a large end, the diameter of the small end of the tapered hole is smaller than the outer diameter of the cavity 52 and larger than the outer diameter of the bottom of the cavity 52, so that the bottom of the cavity 52 can be clamped in the small hole of the tapered hole of the inlet plate 53; the spring 56 is arranged in the cavity 52, one end of the spring 56 is connected with the door plate 54, and the other end of the spring 56 is provided with the control ball 55; the diameter of the door plate 54 is larger than the inner diameter of the cavity 52, and further, the diameter of the door plate 54 is larger than the outer diameter of the cavity 52, so that the door plate 54 can completely cover the cavity 52; the diameter of the control ball 55 is larger than the diameter of the bottom hole, so that the control ball 55 is always in the cavity 52.

[0035] The top of the box body 1 is provided with a heat exhaust pipe, the heat of the cooling agent is discharged from the heat exhaust pipe to the box body 1, and part of the heat of the cooling pipe 3 flows into the return pipe 4 and is cooled by the cooling agent, and the other part is discharged from the heat exhaust pipe to the box body 1.

[0036] The working principle of the one-way valve 5 is as follows:

[0037] 1. During the process that the cooling liquid flows from the side of the gas outlet to the side of the gas inlet, the cooling liquid flows into the tapered hole of the inlet plate 53, lifts up the control ball 55, compresses the spring 56, and the spring 56 makes the door plate 54 away from the fixed plate 51, so that the cooling liquid enters the cavity 52 and then flows to the cooling pipe 3.

[0038] 2. During the process that the cooling liquid flows from the side of the gas inlet to the side of the gas outlet, the cooling liquid impacts the door plate 54 and the fixed plate 51, then the spring 56 presses the control ball 55 to the bottom hole of the cavity 52 to tightly adhere to each other, so as to realize double leakage prevention; thus, the one-way circulation of the cooling liquid is realized.

[0039] During use, the exhaust gas flows from the gas inlet to the gas outlet through the exhaust pipe 2, the cooling pipe 3 around the exhaust pipe 2 cools the exhaust gas, the exhaust gas is discharged through the exhaust port, and the waste heat recovery is completed; in this process, the cooling liquid in the cooling pipe 3 flows from the side close to the gas outlet to the side close to the gas inlet, and the cooling of the cooling liquid is realized in the cooling agent, so as to realize the recycling of the cooling liquid, and the hot gas generated by cooling can be discharged from the box body 1 through the heat exhaust pipe.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A boiler waste heat recovery device comprising a box (1) and an exhaust pipe (2) provided inside and penetrating through the box (1), characterized in that: The box (1) is internally provided with a cooling pipe (3), the cooling pipe (3) is wrapped in the outer wall of the exhaust pipe (2), the cooling pipe (3) contains cooling liquid, the bottom of the cooling pipe (3) is connected with a backflow pipe (4), the two ends of the cooling pipe (3) are communicated through the backflow pipe (4), the backflow pipe (4) is internally provided with a one-way valve (5) near the one end of the air inlet of the exhaust pipe (2), the bottom of the box (1) is provided with a cooling agent.

2. A boiler heat recovery device according to claim 1, characterised in that: The exhaust pipe (2) and the cooling pipe (3) are arranged in inverted Z shape.

3. A boiler heat recovery device according to claim 1, characterized in that: The backflow pipe (4) is immersed in the cooling agent.

4. A boiler heat recovery device according to claim 1, characterized in that: The one-way valve (5) comprises a fixed plate (51), a cavity (52), a liquid inlet plate (53), a door plate (54), a control ball (55) and a spring (56); the top outer wall of the cavity (52) is sleeved with the fixed plate (51), the bottom outer wall of the cavity (52) is sleeved with the liquid inlet plate (53), the cavity (52) is internally provided with the spring (56), one end of the spring (56) is connected with the door plate (54), the other end of the spring (56) is provided with the control ball (55), the top and bottom of the cavity (52) are respectively provided with a top hole and a bottom hole.

5. A boiler heat recovery device according to claim 4, characterised in that: The diameter of the door plate (54) is greater than the inner diameter of the cavity (52).

6. A boiler heat recovery device according to claim 5, characterised in that: The diameter of the control ball (55) is greater than the diameter of the bottom hole.

7. A boiler heat recovery device according to claim 6, characterised in that: The liquid inlet plate (53) is provided with a tapered hole with small top and large bottom, the small end diameter of the tapered hole is smaller than the outer diameter of the cavity (52) and greater than the bottom outer diameter of the cavity (52).

8. A boiler heat recovery device according to claim 1, characterized in that: The inner wall of the air inlet end of the exhaust pipe (2) is provided with a dust removal pad (6), one side of the dust removal pad (6) close to the inner wall of the box (1) is provided with a water removal pad (7), one end of the gas outlet of the exhaust pipe (2) is provided with a water removal pad (7).

9. A boiler heat recovery device according to claim 1, characterized in that: The top of the box (1) is provided with a heat removal pipe (8).

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