A non-powered stack heat recovery device for a boiler

Abstract

The application discloses a boiler unpowered chimney heat recovery device, and belongs to the technical field of heat recovery and utilization devices.The device comprises a double-layer annular heat preservation pipe shell; the double-layer annular heat preservation pipe shell comprises an inner sleeve shell in contact with a chimney and an outer sleeve shell located outside the inner sleeve shell; a fluid channel for medium water flow is formed between the outer sleeve shell and the inner sleeve shell; a plurality of spiral heat conduction pipes extending along the length direction of the fluid channel are circumferentially arranged between the outer sleeve shell and the inner sleeve shell; the two ends of the spiral heat conduction pipes are connected with the outer sleeve shell and the inner sleeve shell respectively; and the spiral heat conduction pipe comprises a base pipe and spiral flow guide fins spirally wound on the outer wall of the base pipe. The device can utilize the chimney waste heat to preheat the cooling water to be discharged to a gas boiler.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat recycling device, and relates to a non-powered chimney heat recycling device for a boiler. BACKGROUND

[0002] Building energy saving is an important part of energy saving and emission reduction, and aims to improve energy utilization efficiency and improve ecological environment quality. Gas boilers are widely used in existing buildings as heat supply and heating, and provide hot water sources. The exhaust gas temperature of the gas boiler chimney is generally greater than 150 DEG C. As high-quality and efficient heat, it is directly discharged into the atmosphere, causing great waste of energy.

[0003] Therefore, a specific chimney heat recycling device is needed, which can use the waste heat of the chimney to preheat the cooling water to be discharged to the gas boiler. CONTENT OF THE INVENTION

[0004] In order to solve the above problems, the application provides a non-powered chimney heat recycling device for a boiler. The specific structure of the device can effectively utilize the waste heat of the chimney to preheat the cooling water to be discharged to the gas boiler.

[0005] The specific technical scheme of the application is as follows:

[0006] On the one hand, the application provides a non-powered chimney heat recycling device for a boiler, which comprises: a double-layer annular heat preservation pipe shell; the double-layer annular heat preservation pipe shell comprises an inner sleeve shell in contact with the chimney and an outer sleeve shell located outside the inner sleeve shell;

[0007] The outer sleeve shell and the inner sleeve shell form a fluid channel for the medium water flow; a plurality of spiral heat conduction pipes extending along the length direction of the fluid channel are arranged circumferentially between the outer sleeve shell and the inner sleeve shell;

[0008] Both ends of the spiral heat conduction pipe are connected with the outer sleeve shell and the inner sleeve shell respectively; the spiral heat conduction pipe comprises a base pipe and a spiral flow guide fin spirally wound on the outer wall of the base pipe;

[0009] The heat recycling device is connected with the water inlet pipe and the water outlet pipe at both ends respectively.

[0010] Optionally, the base pipe and the outer wall provided with the porous structure and the spiral flow guide fin are provided with a plurality of grooves.

[0011] Optionally, the spiral flow guide fin is provided as a multi-layer mesh hollow structure.

[0012] Optionally, the spiral flow guide fin is a winding fin, and the structure shape of the spiral flow guide fin comprises flat fin and corrugated fin.

[0013] Optionally, the height of the spiral flow guide fin is 1 / 10-1 / 6 of the distance between the outer sleeve shell and the inner sleeve shell.

[0014] Optionally, the surface of the spiral flow guide fin is provided with a hydrophilic coating; the material of the hydrophilic coating is a high polymer.

[0015] Further, the thickness of the hydrophilic coating is 0.2-1.2 times the thickness of the fin.

[0016] Optionally, the material of the spiral flow guide fin and the base pipe includes copper and copper alloy.

[0017] Optionally, the spiral heat pipe is provided with a flared shape at the end connected to the chimney; the flared shape includes a trumpet mouth shape.

[0018] Optionally, the end of the heat recovery device is provided with a sealing heat transfer strip; the two ends of the sealing heat transfer strip respectively exceed the outer wall part of the outer shell by 0.1-0.3 cm; the material of the sealing heat transfer strip is heat-conducting silica gel.

[0019] The application can produce beneficial effects including but not limited to:

[0020] 1. The heat recovery device provided by the application can effectively utilize the chimney waste heat to preheat the cooling water to be discharged to the gas boiler; energy saving and emission reduction are achieved, and energy waste is avoided.

[0021] Specifically, the spiral heat guide fin and the base pipe are connected to the chimney pipe wall through the inner shell wall; the chimney heat is transferred to the spiral heat guide fin and the base pipe through the heat conduction of the metal; and the heat exchange between the fin and the base pipe is further achieved through the water flow in the device.

[0022] The spiral flow guide fin can increase the contact area with the water flow and improve the heat conduction effect; and the one-way spiral flow guide fin can guide the water flow to be more evenly distributed on the fin surface during the flow of the water flow, so that the water flow can fully contact each part of the fin and improve the heat conduction efficiency.

[0023] 2. Further, the outer wall of the base pipe and the spiral flow guide fin is provided with a plurality of grooves; which can further increase the contact area of the water flow with the base pipe and the spiral flow guide fin; and increase the heat conduction effect on the water flow.

[0024] 3. Further, the surface of the spiral flow guide fin is provided with a hydrophilic coating. The material of the hydrophilic coating is a high polymer (selected from any one of polyacrylamide, polyethylene glycol, and polyvinyl alcohol); the hydrophilic coating can make the water flow spread better on the fin surface, reduce the contact angle between the water and the fin, increase the contact area between the water and the fin, and be conducive to heat transfer. At the same time, this coating can also prevent the attachment of scale and other impurities on the fin surface, and maintain the heat conduction performance of the fin. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0026] Figure 1 It is an overall structure schematic diagram of the device in use state of the present application;

[0027] Figure 2 It is an overall structure schematic diagram of the device in non-use / installation state of the present application;

[0028] Figure 3 It is a cross-sectional structure schematic diagram of the device in length direction of the present application;

[0029] Figure 4 It is a cross-sectional structure schematic diagram of the device in width direction of the present application;

[0030] Figure 5 It is a schematic diagram of the structure of a local component of the present application;

[0031] Figure 6 It is another schematic diagram of the structure of a local component of the present application.

[0032] List of components and reference numerals:

[0033] 1 double-layer annular heat preservation pipe shell, 101 outer sleeve shell, 102 inner sleeve shell, 2 medium cavity, 3 chimney passage, 301 gas boiler, 302 boiler water inlet, 4 spiral heat conduction pipe, 401 spiral flow guide fin, 402 base pipe, 501 water inlet pipe, 502 water outlet pipe, 6 groove, 701 valve A, 702 valve B. DETAILED DESCRIPTION

[0034] In order to more clearly explain the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0035] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the following will be further described in detail in combination with the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0036] In the following description, a lot of specific details are set forth in order to facilitate a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0037] In addition, in the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through intermediate medium, or the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] As a specific embodiment, with reference to Figures 1-6 As shown in the drawings, a boiler unpowered chimney heat recovery device, comprising: a double-layer annular heat preservation pipe shell 1; the double-layer annular heat preservation pipe shell 1 includes an inner sleeve shell 102 in contact with the chimney and an outer sleeve shell 101 located outside the inner sleeve shell 102;

[0042] The outer shell 101 and the inner shell 102 form a fluid channel for the medium water flow; a plurality of helical heat-conducting pipes 4 extending along the length direction of the fluid channel are arranged circumferentially between the outer shell 101 and the inner shell 102 (the helical heat-conducting pipes 4 form a medium cavity 2 through which the water flows and is discharged from the water outlet); the two ends of the helical heat-conducting pipes 4 are connected with the outer shell 101 and the inner shell 102 respectively; the helical heat-conducting pipe 4 comprises a base pipe 402 and helical flow guide fins 401 spirally wound on the outer wall of the base pipe 402; the helical heat-conducting fins and the base pipe 402 are connected with the chimney pipe wall through the shell wall of the inner shell 102; the heat recovery device is connected with the water inlet pipe 501 and the water outlet pipe 502 at two ends respectively (so that the water in the water inlet pipe 501 flows out through the water outlet pipe 502 after passing through the fluid channel).

[0043] The height of the helical flow guide fin 401 in the embodiment is 1 / 10 of the distance between the outer shell 101 and the inner shell 102; the material of the helical heat-conducting pipe 4 is copper.

[0044] The diameter of the inner sleeve in the embodiment is matched with the diameter size of the chimney, which can be adjusted according to the diameter size of the chimney in actual application, and all are within the protection scope of the present application.

[0045] Figure 2 It is a schematic diagram of the overall structure in the unused / installation state; Figure 1 It is a schematic diagram of the overall structure in the used state, and the number of heat recovery devices installed on the chimney pipe is not limited, all of which are within the protection scope of the present application. As shown in Figure 1 , two heat recovery devices are firmly installed on the outer wall of the chimney during use (the water inlet pipe 501 and the water outlet pipe 502 between the heat recovery devices are connected through the water pipe connector), at this time, the inner shell 102 of the double-layer annular heat preservation pipe shell 1 is connected with the outer wall of the chimney (seamless fit); the water inlet pipe 501 and the water outlet pipe 502 at two ends of the heat recovery device are connected with the water pipe of the gas boiler 301.

[0046] At this time, the valve 701 (such as Figure 1 valve 701A and valve 701B) of the boiler is opened, and the water inlet interface of the boiler starts to supply cold water to the gas boiler 301 (the water inlet direction is Figure 1Route a-Route b), after a period of time, the high-temperature flue gas generated by the gas boiler 301 passes through the chimney passage 3, at this time, the high-temperature heat of the flue gas in the chimney is transferred to the spiral heat-conducting pipe 4 (the spiral heat-conducting fin 401 and the base pipe 402); when the medium water (cool water) flows along the fluid passage between the outer sleeve 101 and the inner sleeve 102 (due to the presence of the spiral heat-conducting pipe 4, specifically through the medium cavity 2 between the spiral heat-conducting pipes 4), heat exchange occurs between the spiral heat-conducting fin 401 and the base pipe 402; the water flowing out of the outlet pipe 502 is hot water, which flows into the boiler again along the straight route (the water inlet direction is Figure 1 Route a-Route b) into the boiler; the process is simple and smooth; the chimney waste heat can be effectively utilized to preheat the cool water about to be discharged into the gas boiler 301; energy saving and emission reduction are achieved, and energy waste is avoided.

[0047] In addition, in the embodiment, the medium water in the pipeline is supplied by the water pressure of a tap.

[0048] In the embodiment, the spiral heat-conducting fin can increase the contact area with the water flow and improve the heat conduction effect; on the other hand, the one-way spiral heat-conducting fin can guide the water flow to be more evenly distributed on the fin surface during the flow of the water flow, so that the water flow can fully contact each part of the fin and improve the heat conduction efficiency.

[0049] As a preferred embodiment, as shown in Figure 6 The outer wall of the base pipe 402 and the spiral heat-conducting fin 401 is provided with a plurality of grooves 6; the contact area of the water flow with the base pipe 402 and the spiral heat-conducting fin 401 can be further increased; and the heat conduction effect on the water flow can be increased.

[0050] As a preferred embodiment, the spiral heat-conducting fin 401 is provided in a multi-layer mesh structure. In this way, water can penetrate into the mesh holes, and the pores can provide additional contact area to enhance the heating effect.

[0051] As a preferred embodiment, the spiral heat-conducting fin 401 is a winding fin, and the structure shape of the spiral heat-conducting fin 401 includes flat fins and corrugated fins. The heating area is increased to enhance the heating effect.

[0052] As a preferred embodiment, the height of the spiral heat-conducting fin 401 is 1 / 10-1 / 6 of the distance between the outer sleeve 101 and the inner sleeve 102. At this time, the contact area of the fin with the water flow neither hinders the water flow nor effectively increases the heat conduction effect on the water flow.

[0053] As a preferred embodiment, the helical flow guide fin 401 is provided with a hydrophilic coating on its surface. The hydrophilic coating is made of a polymer (selected from any one of polyacrylamide, polyethylene glycol, polyvinyl alcohol); the hydrophilic coating can make the water flow better spread on the fin surface, reduce the contact angle between water and fin, increase the contact area between water and fin, and facilitate heat transfer. At the same time, this coating can also prevent the attachment of scale and other impurities on the fin surface, and maintain the heat conduction performance of the fin.

[0054] As a preferred embodiment, the thickness of the hydrophilic coating is 0.2-1.2 times the thickness of the fin, and the heat conduction effect is relatively best at this thickness.

[0055] As a preferred embodiment, the material of the helical flow guide fin 401 and the base pipe 402 includes copper and copper alloy. Copper has a high thermal conductivity, which can quickly transfer heat from the pipe to the fin surface, and then to the water flow.

[0056] As a preferred embodiment, the helical heat pipe 4 is provided with a flared shape at the end connected / pasted to the chimney. For example, a trumpet shape, which can better fit the inner wall of the chimney to increase the contact area between the two and enhance the heat conduction effect and stability.

[0057] As a preferred embodiment, the heat recovery device is provided with a sealing heat transfer strip at the end; the two ends of the sealing heat transfer strip respectively exceed the outer wall part of the outer shell 101 by 0.1-0.3 cm; the material of the sealing heat transfer strip is heat-conducting silica gel. The sealing heat transfer strip not only can effectively seal the gap that may exist at the connection between the two ends, but also can act as a medium for heat conduction.

[0058] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0059] The above only describes the embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A boiler heat recovery device with a non-powered chimney, characterized in that, include: Double-layered annular insulation pipe shell; The double-layer annular insulation pipe shell includes an inner shell that contacts the chimney and an outer shell located outside the inner shell. A fluid channel for the flow of medium water is formed between the outer shell and the inner shell; a plurality of spiral heat-conducting tubes extending along the length of the fluid channel are arranged circumferentially between the outer shell and the inner shell; the two ends of the spiral heat-conducting tubes are respectively connected to the outer shell and the inner shell; the spiral heat-conducting tube includes a base tube and spiral flow-guiding fins spirally wound around the outer wall of the base tube. The heat recovery device is connected to an inlet pipe and an outlet pipe at both ends.

2. The heat recovery device according to claim 1, characterized in that, The outer wall of the base tube and the spiral guide fins is provided with several grooves.

3. The heat recovery device according to claim 1, characterized in that, The spiral guide fins are configured with a multi-layered mesh hollow structure.

4. The heat recovery device according to claim 1, characterized in that, The spiral guide fins are wound fins, and the structural shapes of the spiral guide fins include flat fins and corrugated fins.

5. The heat recovery device according to claim 1, characterized in that, The height of the spiral guide fins is 1 / 10 to 1 / 6 of the distance between the outer shell and the inner shell.

6. The heat recovery device according to claim 1, characterized in that, The surface of the spiral guide fins is provided with a hydrophilic coating; the hydrophilic coating is made of a high molecular polymer.

7. The heat recovery device according to claim 6, characterized in that, The thickness of the hydrophilic coating is 0.2-1.2 times the thickness of the fin.

8. The heat recovery device according to claim 1, characterized in that, The materials of the spiral guide fins and the base tube include copper and copper alloys.

9. The heat recovery device according to claim 1, characterized in that, The spiral heat pipe is configured with a flared shape at the port connected to the chimney; the flared shape includes a trumpet shape.

10. The heat recovery device according to claim 1, characterized in that, The heat recovery device is provided with a sealing heat transfer strip at its end; both ends of the sealing heat transfer strip extend 0.1-0.3 cm beyond the outer wall of the outer casing; the material of the sealing heat transfer strip is thermally conductive silicone.

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