Flow guide structure of exhaust pipe of waste heat boiler

Abstract

The utility model relates to a flow guide structure of a smoke exhaust pipe of a waste heat boiler, which comprises the smoke exhaust pipe, a venturi tube arranged in the smoke exhaust pipe, a plurality of guide pipes arranged on the venturi tube, the venturi tube can accelerate smoke entering the venturi tube, the accelerated smoke is sprayed out through the guide pipes, and the accelerated smoke and smoke which does not enter the venturi tube converge turbulent flow. A jet nozzle is arranged at the gas outlet end of a guide pipe, the jet area of accelerated flue gas is enlarged, the effect of converging turbulent flow of two strands of flue gas is enhanced, a Venturi tube is connected with a supporting ring in an inserted mode and connected with a smoke cap through a hanging rod, and the Venturi tube is connected with the supporting ring in an inserted mode. The suspender is connected with the smoke cap through a bolt, the smoke cap is connected with the smoke exhaust pipe through a bolt, later disassembly and maintenance are facilitated, then the nesting pipe is arranged on the smoke exhaust pipe, connection between the smoke exhaust pipe and the flue is facilitated, and meanwhile the strength and stability of connection between the nesting pipe and the smoke exhaust pipe are improved through the reinforcing ribs.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas pipe technology, specifically relating to a flow guiding structure for a waste heat boiler flue gas pipe. Background Technology

[0002] Waste heat boilers are key equipment for realizing waste heat recovery and utilization. Their working principle is to use the high-temperature exhaust gas generated by the gas generator set to exchange heat with water, converting the heat energy in the exhaust gas into the heat energy of steam, which then drives the steam turbine to generate electricity, thus achieving the recovery and reuse of waste heat. The flue pipe is responsible for guiding the exhaust gas after heat exchange to the outside atmosphere in an orderly manner, ensuring normal gas flow and stable pressure inside the waste heat boiler.

[0003] Currently, most common flue pipes are straight metal pipes directly connected to the tail end of the waste heat boiler, only achieving basic exhaust gas emission. This simple structural design has little effect on the recovery and utilization of waste heat energy from the exhaust gas. In actual operation, the temperature of the exhaust gas discharged from the flue pipe is significantly higher than the ambient temperature, indicating that a large amount of heat energy in the exhaust gas is not being fully utilized. This not only causes energy waste but also generates thermal pollution to the surrounding environment due to heat emissions.

[0004] In conclusion, improving the heat recovery efficiency of waste heat boilers and reducing flue gas temperature are urgent technical problems that need to be solved. Utility Model Content

[0005] In view of the problems existing in the background technology, this utility model provides a flow guiding structure for the flue gas pipe of a waste heat boiler.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a waste heat boiler flue gas pipe guiding structure, including a flue gas pipe, a smoke cap bolted to the upper end of the flue gas pipe, a venturi tube vertically installed inside the flue gas pipe, and multiple guide pipes installed on the upper side wall of the venturi tube. After the flue gas is accelerated through the venturi tube, it is injected downward through the guide pipe and merges with the rising flue gas outside the venturi tube to form a turbulent flow, thereby prolonging the heat exchange time of the flue gas in the waste heat boiler.

[0007] As a further supplement to the above technical solution: a support plate is fixed on the inner wall of the exhaust pipe, a plurality of smoke holes are provided on the support plate, a plug ring is provided in the center hole of the support plate, the lower end of the venturi tube is connected to the support plate through the plug ring, and its upper end is connected to the smoke cap through a hanger rod.

[0008] As a further supplement to the above technical solution: the venturi tube includes a contraction tube, a throat tube, and a diffuser tube, which are connected by bolts. A tube cap is provided on the top of the diffuser tube. The guide tube is welded to the outer wall surface of the tube cap. The contraction tube is installed on the insertion ring. The hanger is connected to the tube cap.

[0009] As a further supplement to the above technical solution: a nested tube is welded to the lower end of the exhaust pipe. The inner diameter of the nested tube is slightly larger than the outer diameter of the exhaust pipe, and it is used to connect the exhaust pipe to the external flue.

[0010] As a further supplement to the above technical solution: a reinforcing rib is provided at the welding point between the exhaust pipe and the nested pipe. The reinforcing rib is distributed in a ring to improve the welding strength and prevent deformation caused by the impact of high-temperature flue gas.

[0011] As a further supplement to the above technical solution: a spray nozzle is inserted into the air outlet end of the guide pipe. The spray nozzle has a conical design to expand the spray area and enhance the flue gas turbulence effect.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. This utility model, through the design of the venturi tube and the guide tube, allows some of the flue gas inside the exhaust pipe to accelerate its upward speed and then change direction to be ejected from the guide tube, where it merges and flows turbulently with the flue gas that has not entered the venturi tube. This slows down the upward speed of the flue gas, increases the heat exchange time of the flue gas, improves the utilization rate of waste heat, and reduces the exhaust temperature.

[0014] 2. This utility model features a nested tube on the exhaust pipe, which facilitates the connection between the exhaust pipe and the flue. Furthermore, the strength and stability of the connection between the nested tube and the exhaust pipe are improved by reinforcing ribs.

[0015] 3. This utility model has a spray nozzle at the air outlet end of the guide pipe to expand the spray area and enhance the effect of the convergence and turbulence of the two streams of smoke.

[0016] 4. When installing this utility model, the venturi tube is inserted into the support ring and connected to the smoke cap through the hanger rod. The hanger rod and the smoke cap are connected by bolts, and the smoke cap is connected to the exhaust pipe by bolts, which facilitates disassembly and maintenance in the later stage. Attached Figure Description

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of the exhaust pipe according to an embodiment of the present utility model;

[0019] Figure 3 This is a cross-sectional view of the venturi tube according to an embodiment of the present invention.

[0020] In the diagram: 1. Exhaust pipe; 2. Smoke cap; 3. Venturi tube; 301. Shrink tube; 302. Throat tube; 303. Diffuser tube; 304. Tube cap; 4. Guide tube; 5. Support plate; 501. Smoke hole; 502. Insertion ring; 6. Hanger rod; 7. Nested tube; 8. Reinforcing rib; 9. Nozzle. Detailed Implementation

[0021] To further illustrate the technical solution of this utility model, the following description is in conjunction with the appendix. Figures 1 to 3 The present invention will be further described in detail through three embodiments. Example 1

[0022] As attached Figures 1 to 2 As shown, this embodiment provides a waste heat boiler flue gas pipe guiding structure, including a flue gas pipe 1, the upper end of which is connected to a smoke cap 2 by bolts. A venturi tube 3 is vertically installed inside the flue gas pipe 1, and multiple guide pipes 4 are provided on the upper side wall of the venturi tube 3. After the flue gas is accelerated through the venturi tube 3, it is injected downward through the guide pipes 4 and merges with the rising flue gas outside the venturi tube 3 to form turbulence, thereby prolonging the heat exchange time of the flue gas in the waste heat boiler. Example 2

[0023] Based on Example 1, as shown in the appendix Figure 2 As shown, we fix a support plate 5 on the inner wall of the exhaust pipe 1. Multiple smoke holes 501 are opened on the support plate 5. A plug ring 502 is set in the center hole of the support plate 5. The lower end of the venturi tube 3 is connected to the support plate 5 through the plug ring 502, and its upper end is connected to the smoke cap 2 through the hanger 6. The hanger 6 and the smoke cap 2 are connected by bolts.

[0024] The Venturi tube 3 specifically includes a contraction tube 301, a throat tube 302, and a diffuser tube 303, which are connected by bolts. A tube cap 304 is provided on the top of the diffuser tube 303. The guide tube 4 is welded to the outer wall surface of the tube cap 304. The contraction tube 301 is installed on the insertion ring 502. The hanger 6 is connected to the tube cap 304. Example 3

[0025] Based on Embodiment 1 and Embodiment 2, as shown in the appendix Figures 2 to 3 As shown, a nested tube 7 is welded to the lower end of the exhaust pipe 1. The inner diameter of the nested tube 7 is slightly larger than the outer diameter of the exhaust pipe 1, and it is used to connect the exhaust pipe 1 to the external flue. Simultaneously, reinforcing ribs 8 are provided at the weld between the exhaust pipe 1 and the nested tube 7. These reinforcing ribs 8 are arranged in a ring to improve the welding strength and prevent deformation caused by the impact of high-temperature flue gas. A nozzle 9 is inserted into the outlet end of the guide pipe 4. The nozzle opening 9 has a conical design to expand the spray area and enhance the flue gas turbulence effect.

[0026] Its installation process and working principle:

[0027] Construction workers hoisted the exhaust pipe 1 onto the waste heat boiler flue, connecting it to the flue via a nested pipe 7, and then sealed it with sealing mud to ensure the airtightness of the exhaust pipe 1. Next, the contraction pipe 301, throat pipe 302, and diffuser pipe 303 were sequentially bolted together to form a venturi pipe 3. Then, the venturi pipe 3 was hoisted onto the support plate 5, and the contraction pipe 301 was connected to the support plate 5 via a plug ring 502. Finally, the smoke cap 2 was hoisted to the upper end of the exhaust pipe 1, and the smoke cap 2 was connected to the hanger 6 and the exhaust pipe 1 with bolts to complete the installation.

[0028] When the waste heat boiler is in operation, the flue gas discharged through the flue rises into the flue pipe 1. Then, part of the flue gas A enters the venturi tube 3 through the contraction tube 301, while another part of the flue gas B continues to rise in the space outside the venturi tube 3 through the flue hole 501. Then, the flow velocity of the flue gas A is accelerated by the venturi tube 4, and then it is ejected through the nozzle 9 through the guide pipe 3. The ejected flue gas A and flue gas B converge and flow turbulently, thereby slowing down the speed of gas rise, prolonging the heat exchange time of the waste heat boiler, and reducing the temperature of the flue gas discharge.

[0029] The foregoing has shown and described the main features and advantages of this utility model. It will be apparent to those skilled in the art that the specific embodiments of this utility model are not limited to the details of the exemplary embodiments described above. Furthermore, without departing from the spirit or essential characteristics of this utility model, the inventive concept and design ideas of this utility model can be implemented in other specific forms, and these should be equivalently included within the protection scope disclosed in the technical solution of this utility model. Therefore, in all respects, the embodiments should be considered exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this utility model.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waste heat boiler flue gas pipe guide structure, comprising a flue gas pipe (1), a smoke cap (2) is bolted at the upper end of the flue gas pipe (1), characterized in that: A venturi tube (3) is vertically installed inside the flue pipe (1). Multiple guide tubes (4) are installed on the upper side wall of the venturi tube (3). After the flue gas is accelerated through the venturi tube (3), it is injected downward through the guide tubes (4) and merges with the rising flue gas outside the venturi tube (3) to prolong the heat exchange time of the flue gas in the waste heat boiler.

2. The exhaust gas pipe guide structure of a waste heat boiler according to claim 1, characterized in that: A support plate (5) is fixed on the inner wall of the exhaust pipe (1). Multiple smoke holes (501) are opened on the support plate (5). A plug ring (502) is provided in the center hole of the support plate (5). The lower end of the venturi tube (3) is connected to the support plate (5) through the plug ring (502), and its upper end is connected to the cigarette cap (2) through the hanger (6).

3. The exhaust gas pipe flow guide structure of a waste heat boiler according to claim 2, characterized in that: The Venturi tube (3) includes a contraction tube (301), a throat tube (302), and a diffuser tube (303), which are connected by bolts. A tube cap (304) is provided on the top of the diffuser tube (303). The guide tube (4) is welded to the outer wall surface of the tube cap (304). The contraction tube (301) is installed on the plug ring (502). The hanger (6) is connected to the tube cap (304).

4. The exhaust gas pipe flow guide structure of a waste heat boiler according to any one of claims 1 to 3, characterized in that: A nested tube (7) is welded to the lower end of the exhaust pipe (1). The inner diameter of the nested tube (7) is slightly larger than the outer diameter of the exhaust pipe (1), and it is used to connect the exhaust pipe (1) to the external flue.

5. The exhaust gas pipe flow guiding structure of a waste heat boiler according to claim 4, characterized in that A reinforcing rib (8) is provided at the welding point between the exhaust pipe (1) and the nested pipe (7). The reinforcing rib (8) is arranged in a ring to improve the welding strength and prevent deformation caused by the impact of high-temperature flue gas.

6. The exhaust gas pipe guide structure of a waste heat boiler according to claim 5, characterized in that: A nozzle (9) is inserted into the outlet end of the guide pipe (4). The nozzle (9) is tapered to expand the spray area and enhance the flue gas turbulence effect.

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