Built-in heat transfer assembly and fire-tube heating furnace

Abstract

The application discloses a built-in heat transfer assembly and a fire-tube heating furnace, and relates to the technical field of heating furnaces.The built-in heat transfer assembly and the fire-tube heating furnace comprise a fire tube, a dredging assembly, a finned tube and a leakage plugging structure, the fire tube is horizontally arranged in the inside of a cylinder, a plurality of connecting holes are formed in the upper and lower inner walls of the fire tube, and the upper and lower connecting holes are located in the same vertical plane.The built-in heat transfer assembly and the fire-tube heating furnace have the following advantages: the heating medium enters the finned tube through a liquid inlet pipe to perform heat exchange, the diameter of the fire tube is large, the finned tube is inserted into the fire tube, the inner diameter of the finned tube can be increased accordingly, and thus the effective heat exchange area is increased;the finned tube is inserted into the fire tube, the flue gas flows around the finned tube when flowing in the fire tube, and the flue gas can flow around the finned tube to wash the finned tube, so that the contact area between the flue gas and the finned tube is increased, the flow speed is increased, the flow state of the flue gas in the fire tube is changed, the convection heat exchange coefficient of the fire tube is increased, and the thermal efficiency of the heating furnace is improved.

Description

Technical Field

[0001] This invention relates to a heat transfer component, and more particularly to a built-in heat transfer component and a fire-tube type heating furnace. Background Technology

[0002] Oilfield-use fire-tube type heating furnaces (including fire-tube furnaces, two-in-one, four-in-one, etc. heating equipment) basically adopt negative pressure combustion. The combustion air volume mainly relies on the chimney draft, resulting in a high air coefficient and large exhaust losses, making precise air distribution impossible. The designed thermal efficiency is only 80-85%. Because the fire tube structure of the heating furnace is designed for negative pressure combustion, and in order to reduce flue gas flow resistance and ensure sufficient chimney draft, the fire tubes of this type of heating furnace are required to be very thick. Specifically, there are two fire tubes with a diameter of φ800mm and four smoke tubes with a diameter of φ550mm.

[0003] Currently, the main methods used in China to improve heat exchange efficiency are the application of heat pipes or finned tubes. However, heat pipes have poor high-temperature resistance and are only suitable for the ends of flue pipes. Finned tubes are seamless steel tubes with externally wrapped fins. While finned tubes have better high-temperature resistance than heat pipes, in practice, considering the high sand and polymer content of chemical flooding produced fluids, which easily accumulate on the outer wall of fire tubes, they are mostly used on flue pipes. They are inserted into the flue pipe, where the medium flows. They have a small diameter, about 150mm, and are prone to clogging and difficult to clean. Therefore, existing heat transfer modules based on finned tubes, due to unreasonable structural design and application methods, do not achieve ideal results in improving the heat exchange efficiency of heating furnaces. Summary of the Invention

[0004] The purpose of this invention is to provide a built-in heat transfer component and a fire-tube type heating furnace to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a built-in heat transfer assembly, comprising a fire tube, a sludge removal assembly, finned tubes, and a leakage sealing structure. The fire tube is horizontally inserted inside the cylinder. Multiple connection holes are provided on the upper and lower inner walls of the fire tube. The upper and lower connection holes are located on the same vertical plane, and finned tubes are inserted through each of the multiple connection holes. The multiple finned tubes are connected in parallel to form a heat transfer module. The upper and lower ends of the multiple finned tubes are respectively located on the upper and lower sides of the fire tube. A connecting pipe is provided at one end of the left and right finned tubes. The connecting pipe is threadedly connected to the two finned tubes. A leakage sealing structure is provided at the connection points between the connecting pipe and the outer sides of the two finned tubes. The leakage sealing structure comprises an annular sealing plate and thermosetting resin. The annular sealing plate is fixedly connected to the connection point between the connecting pipe and the finned tube. The inner side of the annular sealing plate is tightly fitted to the fire tube, and the thermosetting resin is disposed inside the annular sealing plate.

[0006] As a preferred embodiment of the present invention, sludge removal components are provided on both the upper and lower sides of the finned tube. The sludge removal components include flanges, gaskets, blind flanges, clamps, and sludge removal ports. The sludge removal ports are connected to the connecting pipes, and flanges are fitted onto the outer side of the sludge removal ports.

[0007] As a preferred embodiment of the present invention, the outer side of the flange is fitted with the gasket, the outer side of the gasket is provided with a blind plate, the blind plate is fitted with the gasket, the flange, the gasket and the blind plate are all located inside the clamp, and the clamp is sleeved on the outer side of the connecting pipe.

[0008] As a preferred embodiment of the present invention, a smoke pipe is fixedly connected to the outer side of the upper end of the finned tube on one side, and the end of the smoke pipe away from the finned tube is disposed through the outer side of the cylinder, and the smoke pipe is located above the fire pipe.

[0009] As a preferred embodiment of the present invention, a tube platform is welded to the outside of the finned tube, and the outside of the viewing platform is closely fitted with the fire tube.

[0010] As a preferred embodiment of the present invention, a front liquid inlet pipe is fixedly connected to the outer side of the lower end of one side of the finned tube, and a rear liquid inlet pipe is fixedly connected to the outer side of the lower end of the other side of the finned tube.

[0011] As a preferred embodiment of the present invention, sealing rings are fixedly connected to the inner surfaces of the plurality of connecting holes.

[0012] A fire tube type heating furnace includes a head and a cylinder, wherein the head is located at the front end of the cylinder and is welded and fixed to the cylinder, and the middle and rear part of the fire tube is connected to the built-in heat transfer component according to any one of claims 1-7.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention utilizes finned tubes. The heating medium first enters the finned tubes through the liquid inlet pipe for heat exchange. Because the fire tube has a large diameter, and the finned tube is inserted into the fire tube, the inner diameter of the finned tube can also be increased accordingly, thereby increasing the effective heat exchange area. Since the finned tube is inserted into the fire tube, the flue gas must bypass the finned tube as it flows through the fire tube, creating a flow around and scouring effect on the finned tube. This increases the contact area between the flue gas and the finned tube and improves the flow velocity. Simultaneously, it alters the flow state of the flue gas within the fire tube, thereby improving the convective heat transfer coefficient of the fire tube and the thermal efficiency of the furnace. Furthermore, before the adjacent finned tubes and connecting pipes are installed, thermosetting resin in liquid form seeps into the narrow gap at the connection point between the connecting pipe and the finned tube. During subsequent use of the furnace, the thermosetting resin, under high temperature, solidifies at the connection point, reducing the problem of medium leakage at the connection.

[0015] This invention, by setting up a sludge removal component, allows for easy opening of the sludge removal port by simply removing the clamp from the finned tube interface when sludge removal is required. Moreover, the clamp has a simple structure and can be easily opened, disassembled, or installed even when the cleanliness of the medium in polymer flooding, high-concentration polymer flooding, and ternary composite flooding blocks is very poor. For chemical flooding produced fluids with high sand or polymer content, the sludge removal port can be used to clean them at any time, effectively preventing clogging of the finned tubes. Since the chemical flooding produced fluid and other media first enter the finned tubes, it can effectively reduce the accumulation of sludge on the outer wall of the fire tube.

[0016] This invention uses a front-end liquid inlet pipe to allow the heated medium, after being heated by flue gas, to enter the heating furnace chamber. The medium is further heated by the flue pipe and fire pipe until it reaches the desired temperature. After absorbing sufficient heat, the heated medium enters the furnace body through the liquid distribution pipe, where it further exchanges heat with the outer wall of the flue and fire pipes. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of a fire-tube type heating furnace according to an embodiment of this disclosure.

[0018] Figure 2 A cross-sectional structural schematic diagram of a fire-tube type heating furnace according to an embodiment of this disclosure;

[0019] Figure 3 This is a diagram showing the connection relationship between the finned tube and the fire tube according to an embodiment of this disclosure;

[0020] Figure 4 yes Figure 2 A magnified view of part B in the image;

[0021] Figure 5 This is a diagram showing the arrangement of finned tubes or finned tube assemblies according to an embodiment of this disclosure;

[0022] Figure 6 yes Figure 1 A magnified view of part A in the image;

[0023] Figure 7 This is a diagram showing the series connection of finned tube assemblies according to an embodiment of this disclosure;

[0024] Figure 8 This is a schematic diagram of the dredging port structure according to an embodiment of the present disclosure;

[0025] Figure 9 This is a schematic diagram of the dredging port connection component according to an embodiment of the present disclosure.

[0026] In the diagram: 1. End cap; 2. Cylinder; 3. Smoke pipe; 4. Fire pipe; 5. Front liquid inlet pipe; 6. Connecting pipe; 7. Dredging assembly; 71. Flange; 72. Gasket; 73. Blind flange; 74. Clamp; 75. Dredging port; 8. Finned tube; 9. Rear liquid inlet pipe; 10. Pipe platform; 11. Connecting hole; 12. Sealing ring; 13. Leakage sealing structure; 131. Annular sealing plate; 132. Thermosetting resin. Implementation

[0027] 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, and 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.

[0028] Please see Figure 1-9 This invention provides a technical solution for a built-in heat transfer component and a fire-tube type heating furnace:

[0029] according to Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 7As shown, an internal heat transfer assembly includes a fire tube 4, a sludge removal assembly 7, finned tubes 8, and a leakage sealing structure 13. The fire tube 4 is horizontally inserted inside the cylinder 2. Multiple connection holes 11 are provided on the upper and lower inner walls of the fire tube 4. The upper and lower connection holes 11 are located on the same vertical plane, and finned tubes 8 are inserted through each of the multiple connection holes 11. The upper part of the finned tubes 8 is connected to the fire tube 4 through a tube platform 10. Because the fire tube 4 needs to have a hole larger than the outer diameter of the fins to insert the finned tubes 8, during welding, the tube platform 10 is used to weld the finned tubes 8 first, and then the fire tube 4 is welded to the tube platform 10 to solve the problem of poor welding quality due to the large hole. Multiple finned tubes 8 are connected in parallel to form a heat transfer module, and the upper and lower ends of the multiple finned tubes 8 are respectively located on the upper and lower sides of the fire tube 4. The finned tube groups 8 are inserted into the fire tube 4 with eccentricities of 355mm and 120mm, respectively. Each group of 8 finned tubes consists of 2 finned tubes 8, with a tube spacing of 475mm and a center-to-center distance of 500mm between adjacent groups of 8 finned tubes 8. Each finned tube 8 extends 4250mm above and below the fire tube 4. The portion of the finned tube 8 located inside the fire tube 4 has fins wrapped around its outer edge. The heat exchange area of ​​the entire assembly can be adjusted by increasing or decreasing the number of groups of finned tubes 8. A connecting pipe 6 is provided at one end of the connection position between the two finned tubes 8 on the left and right sides. The connecting pipe 6 is threadedly connected to the two finned tubes 8. Leakage sealing structures 13 are provided at all side connection positions. The leakage sealing structure 13 includes annular sealing plates 131 and thermosetting resin 132. The annular sealing plates 131 are fixedly connected at the connection position between the connecting pipe 6 and the finned tube 8. The fins are 200mm high, 1mm thick, and 6mm apart. The number of turns for each pair of finned tubes 8 are 122 and 178 respectively. The inner side of the annular sealing plate 131 is tightly fitted with the fire tube 4. Thermosetting resin 132 is provided inside the annular sealing plate 131.

[0030] according to Figure 2 , Figure 3 , Figure 4 ,and Figure 6As shown, sludge removal components 7 are provided on both the upper and lower sides of the finned tube 8. Each sludge removal component 7 includes a flange 71, a gasket 72, a blind flange 73, a clamp 74, and a sludge removal port 75. The sludge removal port 75 is connected to the connecting pipe 6. A flange 71 is fitted onto the outside of the sludge removal port 75, and the outside of the flange 71 is in contact with the gasket 72. A blind flange 73 is provided on the outside of the gasket, and the blind flange 73 is in contact with the gasket. The flange 71, gasket 72, and blind flange 73 are all located inside the clamp 74, which is fitted onto the outside of the connecting pipe 6. A smoke pipe 3 is fixedly connected to the outer side of the upper end of one side of the finned tube 8. The end of the smoke pipe 3 away from the finned tube 8 passes through the outer side of the cylinder 2. The smoke pipe 3 is located above the fire pipe 4. A pipe platform is welded to the outside of the finned tube 8. 10. The outer side of the observation platform is tightly fitted with the fire tube 4. The lower outer side of one finned tube 8 is fixedly connected to the front liquid inlet pipe 5, and the lower outer side of the other finned tube 8 is fixedly connected to the rear liquid inlet pipe 9. The inner surface of multiple connection holes 11 is fixedly connected with sealing rings 12. The sludge removal port 75 is connected to the blind plate 73 through clamps 74. First, the flange 71 is connected to the sludge removal port 75. Then, a gasket 72 is placed between the end face of the flange 71 and the blind plate 73. Finally, the blind plate 73 is fixed to the sludge removal port 75 through clamps 74. The clamp 74 has a simple structure and can be easily opened, disassembled or installed even when the cleanliness of the medium in the polymer flooding, high-concentration polymer flooding and ternary composite flooding blocks is very poor.

[0031] according to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, a fire tube type heating furnace includes a head 1 and a cylinder 2. The head 1 is located at the front end of the cylinder 2 and is welded and fixed to the cylinder 2. The middle and rear part of the fire tube 4 is connected to the built-in heat transfer assembly of any one of claims 1-7.

[0032] In practical use, the built-in heat transfer component and fire tube type heating furnace of this invention allow the heated medium to enter the heating furnace through the inlet and then enter the finned tube 8 or finned tube 8 group in the heat transfer module through the rear liquid inlet pipe 9. The medium then flows in a tortuous manner within the flow channel of the finned tube 8 or finned tube 8 group. The heated medium flows within the finned tube 8, which is located within the fire tube 4. The flue gas in the fire tube 4 washes over the finned tube 8, exchanging heat with it. The heated medium, after being heated by the flue gas, then enters the heating furnace cavity through the front liquid inlet pipe 5, where it is further heated by the flue pipe 3 and the fire tube 4 to reach the required temperature. The flue gas flowing within the fire tube 4 must bypass the finned tube 8, creating a flow around and washing effect on the finned tube 8, thereby increasing the heat transfer efficiency. The finned tube 8 increases the contact area and flow velocity, while changing the flow state of the flue gas in the fire tube 4, thereby improving the convective heat transfer coefficient of the fire tube 4 and the thermal efficiency of the heating furnace. After the heated medium fully absorbs heat, it enters the furnace body through the liquid distribution pipe and further exchanges heat with the outer wall of the fire tube 4. The heated medium leaves the heating furnace directly through the liquid outlet pipe according to the equipment function, or enters the buffer section through the weir plate, settles and buffers, and then leaves the heating furnace. In addition, the finned tube 8 is connected to the sludge removal port 75. For chemical flooding produced fluid with high sand content and high polymer content, it can be cleaned at any time through the sludge removal port 75, effectively avoiding the clogging of the finned tube 8. Because the chemical flooding produced fluid and other media first enter the finned tube 8, the accumulation on the outer wall of the fire tube 4 can be effectively reduced.

[0033] In the description of this invention, only preferred embodiments are described, but the scope of protection of this invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this invention, based on the technical solution and inventive concept of this invention, should be covered within the scope of protection of this invention.

Claims

1. A built-in heat transfer assembly, comprising a fire tube (4), a sludge removal assembly (7), a finned tube (8), and a leakage sealing structure (13), characterized in that: The fire tube (4) is horizontally inserted inside the cylinder (2). Multiple connection holes (11) are provided on both the upper and lower inner walls of the fire tube (4). The upper and lower connection holes (11) are located on the same vertical plane, and finned tubes (8) are inserted through each of the multiple connection holes (11). The multiple finned tubes (8) are connected in parallel to form a heat transfer module. The upper and lower ends of the multiple finned tubes (8) are respectively located on the upper and lower sides of the fire tube (4). A connecting pipe (6) is provided at one end of each of the left and right finned tubes (8). 6) Threaded connection with two finned tubes (8), the connecting pipe (6) and the two finned tubes (8) are provided with a leakage sealing structure (13) at the connection position on the outside. The leakage sealing structure (13) includes an annular sealing piece (131) and thermosetting resin (132). The annular sealing piece (131) is fixedly connected at the connection position between the connecting pipe (6) and the finned tube (8). The inner side of the annular sealing piece (131) is tightly fitted with the fire tube (4). Thermosetting resin (132) is provided inside the annular sealing piece (131). The finned tube (8) is provided with sludge removal components (7) on both the upper and lower sides. The sludge removal components (7) include a flange (71), a gasket (72), a blind flange (73), a clamp (74), and a sludge removal port (75). The sludge removal port (75) is connected to the connecting pipe (6), and a flange (71) is sleeved on the outside of the sludge removal port (75). A front liquid inlet pipe (5) is fixedly connected to the outer side of the lower end of one side of the finned tube (8), and a rear liquid inlet pipe (9) is fixedly connected to the outer side of the lower end of the other side of the finned tube (8). The heated medium enters the heating furnace through the inlet, enters the finned tube (8) in the heat transfer module through the rear liquid inlet pipe (9) to exchange heat with the flue gas in the fire tube (4), and then enters the heating furnace cavity through the front liquid inlet pipe (5).

2. The built-in heat transfer component according to claim 1, characterized in that: The flange (71) is fitted to the gasket (72) on the outside. A blind plate (73) is provided on the outside of the gasket (72). The blind plate (73) is fitted to the gasket. The flange (71), gasket (72) and blind plate (73) are all located inside the clamp (74). The clamp (74) is sleeved on the outside of the connecting pipe (6).

3. The built-in heat transfer component according to claim 2, characterized in that: A smoke pipe (3) is fixedly connected to the outer side of the upper end of the finned tube (8) on one side. The end of the smoke pipe (3) away from the finned tube (8) is disposed through the outer side of the cylinder (2). The smoke pipe (3) is located above the fire pipe (4).

4. The built-in heat transfer component according to claim 1, characterized in that: The finned tube (8) is welded to a tube platform (10), and the outside of the tube platform (10) is closely fitted with the fire tube (4).

5. The built-in heat transfer component according to claim 1, characterized in that: A sealing ring (12) is fixedly connected to the inner surface of each of the multiple connecting holes (11).

6. A fire-tube type heating furnace, comprising a head (1) and a cylinder (2), characterized in that: The end cap (1) is located at the front end of the cylinder (2), and the end cap (1) is welded and fixed to the cylinder (2), and the cylinder also includes the built-in heat transfer component as described in any one of claims 1-5.

Images