A high-temperature flue gas waste heat boiler

Abstract

This utility model belongs to the field of flue gas treatment technology, and particularly relates to a high-temperature flue gas waste heat boiler, including an insulated furnace, an S-shaped flue gas guide pipe, a flue gas inlet pipe, and an S-shaped water guide pipe. The chimney is installed inside the insulated furnace, and the top exhaust pipe extends to the outside. The S-shaped flue gas guide pipe is connected to the bottom of the chimney through a first connecting pipe. The flue gas inlet pipe is connected to the S-shaped flue gas guide pipe through a second connecting pipe. The S-shaped water guide pipe is located inside the S-shaped flue gas guide pipe and forms an input end and an output end. Multiple S-shaped flue gas guide pipes and S-shaped water guide pipes are arranged along the circumference of the chimney. The output end and input end of adjacent S-shaped water guide pipes are connected through a third connecting pipe with a valve and a tee joint. The S-shaped design extends the contact time between flue gas and water, increases the total heat transfer per unit time, utilizes the heat transfer of the chimney and the heat insulation furnace to reduce heat dissipation, and improves the thermal energy utilization rate of the flue gas. Furthermore, the valve controls the series connection of adjacent S-shaped water guide pipes, extending the contact time when the output of a single water guide pipe does not reach the required temperature, ensuring the output temperature, and making adjustment convenient.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas treatment technology, and in particular relates to a high-temperature flue gas waste heat boiler. Background Technology

[0002] A high-temperature flue gas waste heat boiler is an energy-saving device that uses the waste heat of high-temperature flue gas emitted during industrial production to heat water or other media, thereby producing steam or hot water. It achieves secondary energy utilization by recovering the heat of flue gas that would otherwise be directly emitted into the environment. It is widely used in metallurgy, chemical industry, power, building materials and other industrial fields, and is one of the key devices for energy conservation and emission reduction.

[0003] Traditional high-temperature flue gas waste heat boilers introduce high-temperature flue gas into the boiler, which contains multiple tube bundles. Heat is conducted through these tube bundles to heat the water inside. However, the short residence time of the flue gas in the tube bundle area reduces the total heat transfer per unit time, resulting in insufficient heat recovery. Furthermore, the exhaust gas temperature remains high, and the waste heat it carries is not utilized, leading to a low overall thermal energy utilization rate. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a high-temperature flue gas waste heat boiler, which increases the contact time between flue gas and water or other media, thereby increasing the total heat transfer per unit time and improving the overall thermal energy utilization rate of the flue gas.

[0005] In view of this, the present invention provides a high-temperature flue gas waste heat boiler, comprising:

[0006] The insulated furnace has an internal chimney, and the top of the chimney has a flue pipe that runs through the insulated furnace and extends to the outside.

[0007] An S-shaped flue is installed on the surface of the chimney, and one end of the flue is connected to the bottom of the chimney via a first connecting pipe.

[0008] The flue gas inlet pipe is installed through the heat insulation furnace at one end, and a second connecting pipe is provided between it and the S-shaped flue gas inlet pipe;

[0009] The S-shaped water guide pipe is installed on the surface of the chimney and located inside the S-shaped flue pipe, forming an input end and an output end at both ends;

[0010] Multiple S-shaped flue pipes and S-shaped water pipes are provided and arranged around the circumference of the chimney surface. Both the output and input ends of two adjacent S-shaped water pipes are equipped with T-joints, and a third connecting pipe is provided between the two T-joints. A valve for opening and closing the pipeline is installed on the third connecting pipe.

[0011] In the above technical solution, further:

[0012] Multiple first baffles are provided on the surface of the chimney along the S-shaped water guide pipe, and the first baffles are penetrated by the S-shaped water guide pipe and fixedly connected to the S-shaped water guide pipe;

[0013] The inner wall of the S-shaped smoke guide pipe is provided with multiple second baffles along the S-shaped water guide pipe, and the second baffles are passed through the S-shaped water guide pipe and fixedly connected to the S-shaped water guide pipe.

[0014] The first and second baffles are staggered and form a first tortuous channel inside the S-shaped smoke guide pipe.

[0015] In the above technical solution, further:

[0016] Both the first and second baffles are tilted downwards.

[0017] In the above technical solution, further:

[0018] Ash baffles are provided on the side of the first baffle away from the chimney surface and on the side of the second baffle close to the first baffle. The top of the ash baffle is rotatably connected to the S-shaped smoke guide pipe. When it hangs down naturally, it can prevent the smoke and dust on the first baffle and the second baffle from falling. After the smoke and dust accumulates enough weight, it will be pushed away by the accumulated smoke and dust, allowing the smoke and dust to fall.

[0019] In the above technical solution, further:

[0020] The vertical height of the dust baffle is much smaller than the vertical height of the first tortuous passage.

[0021] In the above technical solution, further:

[0022] Multiple third baffles are staggered along the vertical direction inside the chimney, and these multiple third baffles form a second tortuous channel inside the chimney.

[0023] In the above technical solution, further:

[0024] The S-shaped flue includes multiple vertically arranged tubes, with heat dissipation fins between each pair of adjacent tubes, and the heat dissipation fins are connected to the surface of the chimney.

[0025] In the above technical solution, further:

[0026] A filter screen is installed between the top of the chimney and the exhaust pipe.

[0027] The beneficial effects of this utility model are as follows:

[0028] 1. By using an S-shaped flue gas duct with an S-shaped water duct inside, the contact time between flue gas and water is extended, thereby increasing the total heat transfer per unit time. After the flue gas and water come into contact and transfer heat, the flue gas is then guided into the chimney, where it transfers heat into the S-shaped flue gas duct. Combined with the insulated furnace, this reduces the heat loss of the flue gas from the S-shaped flue gas duct to the outside, further ensuring the heat transfer effect between the flue gas and water, and improving the overall thermal energy utilization rate of the flue gas.

[0029] 2. By using a T-joint to connect two adjacent S-shaped water pipes, when the hot water or steam generated when flowing through a single S-shaped water pipe does not reach the required temperature, the two adjacent S-shaped water pipes can be connected in series by opening and closing the valve, which prolongs the contact time between the flue gas and the batch of water, ensuring that the generated hot water or steam reaches the required temperature, and is easy to adjust.

[0030] 3. By using multiple first and second baffles, the residence time of flue gas in the S-shaped flue gas duct is further extended to improve the heat transfer effect. It can also provide a fixed support for the S-shaped water duct, improving structural stability. Furthermore, the rotating dust baffle can cause the dust carried in the flue gas to stay briefly on the surfaces of the multiple first and second baffles, thereby allowing the heat carried in the dust to be conducted to the S-shaped water duct through the multiple first and second baffles, improving the heat recovery from the dust and further increasing the heat recovery rate.

[0031] 4. By setting up the third baffle, the residence time of flue gas in the chimney can be increased, thereby ensuring the recovery rate of heat energy in the flue gas. In addition, the heat dissipation fins set on the surface of the chimney can improve the heat conduction of the flue gas inside the chimney to the S-shaped flue pipe side, reducing the heat loss of the S-shaped flue pipe. At the same time, the filter screen can intercept the dust in the flue gas, avoiding environmental problems caused by the discharge of dust. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0034] Figure 3 This is a top view of the present invention;

[0035] Figure 4 This is a utility model Figure 3 Sectional view at point AA;

[0036] Figure 5 This is a utility model Figure 3 Sectional view at point BB;

[0037] Figure 6 This is a utility model Figure 3 Sectional view at CC;

[0038] Figure 7 This is a utility model Figure 6 Enlarged view at point D;

[0039] The markings in the diagram represent: 1. Insulated furnace; 2. Chimney; 3. Exhaust pipe; 4. S-shaped flue pipe; 5. First connecting pipe; 6. Flue gas inlet pipe; 7. Second connecting pipe; 8. S-shaped water pipe; 80. Input end; 81. Output end; 9. T-joint; 10. Third connecting pipe; 11. Valve; 12. First baffle; 13. Second baffle; 14. Ash baffle; 15. Third baffle; 16. Heat dissipation fins; 17. Filter screen. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0041] Example 1:

[0042] This embodiment provides a high-temperature flue gas waste heat boiler, including:

[0043] The heat insulation furnace 1 has a chimney 2 installed inside, and the top of the chimney 2 is provided with a flue pipe 3 that runs through the heat insulation furnace 1 and extends to the outside.

[0044] An S-shaped flue pipe 4S is installed on the surface of the chimney 2, and one end of the pipe is connected to the bottom of the chimney 2 by a first connecting pipe 5.

[0045] The flue gas inlet pipe 6 is installed through the heat insulation furnace 1 at one end, and is connected to the S-shaped flue gas inlet pipe 4S by a second connecting pipe 7.

[0046] S-shaped water guide pipe 8S is installed on the surface of chimney 2 and located inside S-shaped flue pipe 4S, with an input end 80 and an output end 81 at both ends;

[0047] Multiple S-shaped flue pipes 4S and S-shaped water pipes 8S are provided and arranged around the circumference of the surface of the chimney 2. The output end 81 and input end 80 of two adjacent S-shaped water pipes 8S are provided with a three-way connector 9, and a third connecting pipe 10 is provided between the two three-way connectors 9. A valve 11 for opening and closing the pipeline is installed on the third connecting pipe 10.

[0048] Among them, the heat-insulating furnace 1 can be made by setting heat-insulating material on the inner wall, which is an existing mature technology. It is known to those skilled in the art from traditional furnaces / barrels / cauldrons and other devices that provide heat insulation, and will not be described in detail here.

[0049] The exhaust pipe 3 can be connected to the waste gas treatment equipment, and the flue gas inlet pipe 6 can be connected to the equipment that generates flue gas. The input end 80 and the output end 81 of the S-shaped water guide pipe 8S are both equipped with valves 11 for controlling the opening and closing of the pipe. Both the valve 11 and the valve 11 on the third connecting pipe 10 are valves 11 that can be remotely controlled. The specific type of valve 11 used can be selected by those skilled in the art as needed, and this application will not elaborate further.

[0050] As can be seen from this embodiment, by setting an S-shaped water pipe 8S inside the S-shaped flue gas pipe 4S, the contact time between flue gas and water is extended, thereby increasing the total heat transfer per unit time. After the flue gas and water come into contact and transfer heat, they are introduced into the chimney 2, and heat is transferred into the S-shaped flue gas pipe 4S through the chimney 2. In conjunction with the heat insulation furnace 1, the heat loss of flue gas in the S-shaped flue gas pipe 4S to the outside can be reduced, further ensuring the heat transfer effect between flue gas and water, and improving the overall thermal energy utilization rate of flue gas.

[0051] Furthermore, a three-way connector 9 is used to connect two adjacent S-shaped water pipes 8S. When the hot water or steam generated when flowing through a single S-shaped water pipe 8S does not reach the required temperature, the two adjacent S-shaped water pipes 8S can be connected in series by opening and closing the valve 11 to extend the contact time between the flue gas and the batch of water, ensuring that the generated hot water or steam reaches the required temperature, and the adjustment is convenient.

[0052] Example 2:

[0053] This embodiment provides a high-temperature flue gas waste heat boiler, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0054] Multiple first baffles 12 are provided on the surface of the chimney 2 along the S-shaped water guide pipe 8S, and the first baffles 12 are penetrated by the S-shaped water guide pipe 8S and are fixedly connected to the S-shaped water guide pipe 8S.

[0055] Multiple second baffles 13 are provided on the inner wall of the S-shaped smoke guide pipe 4S along the S-shaped water guide pipe 8S, and the second baffles 13 are passed through the S-shaped water guide pipe 8S and are fixedly connected to the S-shaped water guide pipe 8S.

[0056] The first baffle 12 and the second baffle 13 are staggered and form a first tortuous channel within the S-shaped smoke guide pipe 4S;

[0057] Meanwhile, the first baffle 12 can be welded to the chimney 2 and the S-shaped water guide pipe 8S, the second baffle 13 can be welded to the S-shaped water guide pipe 8S, and can be bolted to the S-shaped smoke guide pipe 4S.

[0058] As can be seen from this embodiment, by using multiple staggered first baffles 12 and second baffles 13, the residence time of flue gas in the S-shaped flue gas pipe 4S is further extended to improve the heat transfer effect. It can also provide a fixed support for the S-shaped water pipe 8S, thereby improving the structural stability.

[0059] Example 3:

[0060] This embodiment provides a high-temperature flue gas waste heat boiler, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0061] Both the first baffle 12 and the second baffle 13 are inclined downwards.

[0062] As can be seen from this embodiment, by setting the first baffle 12 and the second baffle 13 downwardly, the part of the smoke dust intercepted in the flue gas can slide off and will not accumulate on the multiple first baffles 12 and the second baffle 13, thus ensuring the heat transfer effect between the flue gas and the multiple first baffles 12 and the second baffle 13.

[0063] Example 4:

[0064] This embodiment provides a high-temperature flue gas waste heat boiler, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0065] Dust baffles 14 are provided on the side of the first baffle 12 away from the surface of the chimney 2 and on the side of the second baffle 13 close to the first baffle 12. The top of the dust baffle 14 is rotatably connected to the S-shaped smoke guide pipe 4S. When it hangs down naturally, it can block the smoke and dust on the first baffle 12 and the second baffle 13 from falling. After the smoke and dust accumulates enough weight, it will be pushed away by the accumulated smoke and dust, allowing the smoke and dust to fall.

[0066] The dust baffle 14 has a shaft at its top, and the inner wall of the S-shaped smoke guide pipe 4S has a round hole that matches the shaft. The shaft and the inner wall of the round hole are fitted with a clearance so that the dust baffle 14 can rotate freely.

[0067] As can be seen from this embodiment, the dust baffle 14 connected by rotation can make the dust carried in the flue gas stay briefly on the surfaces of multiple first baffles 12 and second baffles 13, so that the heat carried in the dust can be conducted to the S-shaped water pipe 8S through multiple first baffles 12 and second baffles 13, thereby improving the heat recovery in the dust and further improving the heat recovery rate.

[0068] Example 5:

[0069] This embodiment provides a high-temperature flue gas waste heat boiler, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0070] The vertical height of the dust baffle 14 is much smaller than the vertical height of the first tortuous channel.

[0071] As can be seen from this embodiment, by setting the height of the baffle plate 14 in the vertical direction as described above, the obstruction of the first tortuous channel can be avoided to the greatest extent, ensuring the flow of flue gas and avoiding obstruction of the flow of flue gas.

[0072] Furthermore, with both the first baffle 12 and the second baffle 13 inclined downwards, the baffle 14 can also create a certain backflow effect, thereby further increasing the heat transfer time between flue gas and water, and thus improving the heat transfer effect.

[0073] Example 6:

[0074] This embodiment provides a high-temperature flue gas waste heat boiler, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0075] Multiple third baffles 15 are staggered along the vertical direction inside the chimney 2, and the multiple third baffles 15 form a second tortuous channel inside the chimney 2;

[0076] Among them, multiple third baffles 15 can be welded to the chimney 2.

[0077] As can be seen from this embodiment, by setting the third baffle 15, the residence time of flue gas in the chimney 2 can be increased, thereby ensuring the recovery rate of heat energy in the flue gas.

[0078] Example 7:

[0079] This embodiment provides a high-temperature flue gas waste heat boiler, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0080] The S-shaped flue duct 4S includes multiple vertically arranged tubes, and heat dissipation fins 16 are provided between two adjacent tubes, and the heat dissipation fins 16 are connected to the surface of the chimney 2.

[0081] The heat dissipation fins 16 and the chimney 2 can be welded together.

[0082] As can be seen from this embodiment, the heat dissipation fins 16 provided on the surface of the chimney 2 can improve the heat conduction of the flue gas inside the chimney 2 to the S-shaped flue duct 4S side, and reduce the heat loss of the S-shaped flue duct 4S to the outside.

[0083] Example 8:

[0084] This embodiment provides a high-temperature flue gas waste heat boiler, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0085] A filter screen 17 is installed between the top of the chimney 2 and the exhaust pipe 3;

[0086] The material of the filter screen 17 can be selected according to the specific flue gas, which is a standard choice for technicians in the relevant technical field, and will not be elaborated here.

[0087] As can be seen from this embodiment, by setting up the filter screen 17, the smoke and dust in the flue gas can be intercepted, thus avoiding environmental problems caused by the discharge of smoke and dust.

[0088] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A high temperature flue gas heat recovery boiler, characterized in that, include: The insulated furnace (1) has a chimney (2) installed inside, and the top of the chimney (2) is provided with a flue pipe (3) that runs through the insulated furnace (1) and extends to the outside. An S-shaped flue pipe (4) is installed on the surface of the chimney (2), and a first connecting pipe (5) is provided between one end and the bottom of the chimney (2); The flue gas inlet pipe (6) is installed through the heat insulation furnace (1) at one end, and is connected to the S-shaped flue gas inlet pipe (4) by a second connecting pipe (7); S-shaped water pipe (8) is installed on the surface of the chimney (2) and located inside the S-shaped flue pipe (4), and forms an input end (80) and an output end (81) at both ends. Among them, multiple S-shaped smoke guide pipes (4) and S-shaped water guide pipes (8) are provided and arranged around the circumference of the surface of the chimney (2). The output end (81) and input end (80) of two adjacent S-shaped water guide pipes (8) are provided with tee joints (9), and a third connecting pipe (10) is provided between the two tee joints (9). A valve (11) for opening and closing the pipeline is installed on the third connecting pipe (10).

2. The high-temperature flue gas waste heat boiler according to claim 1, characterized in that: The surface of the chimney (2) is provided with a plurality of first baffles (12) along the S-shaped water guide pipe (8), and the first baffles (12) are penetrated by the S-shaped water guide pipe (8) and fixedly connected to the S-shaped water guide pipe (8); The inner wall of the S-shaped smoke guide pipe (4) is provided with multiple second baffles (13) along the S-shaped water guide pipe (8), and the second baffles (13) are penetrated by the S-shaped water guide pipe (8) and fixedly connected to the S-shaped water guide pipe (8); The first baffle (12) and the second baffle (13) are staggered and form a first tortuous channel in the S-shaped smoke guide pipe (4).

3. The high-temperature flue gas waste heat boiler according to claim 2, characterized in that: The first baffle (12) and the second baffle (13) are both inclined downwards.

4. The high-temperature flue gas waste heat boiler according to claim 3, characterized in that: The first baffle (12) is provided with a baffle plate (14) on the side away from the surface of the chimney (2) and the second baffle (13) is provided with a baffle plate (14) on the side close to the first baffle (12). The top of the baffle plate (14) is rotatably connected to the S-shaped smoke guide pipe (4). When it hangs down naturally, it can block the smoke and dust on the first baffle (12) and the second baffle (13) from falling. After the smoke and dust accumulates enough weight, it will be pushed away by the accumulated smoke and dust, allowing the smoke and dust to fall.

5. The high-temperature flue gas waste heat boiler according to claim 4, characterized in that: The vertical height of the dust baffle (14) is much smaller than the vertical height of the first tortuous channel.

6. The high-temperature flue gas waste heat boiler according to claim 1, characterized in that: Multiple third baffles (15) are staggered along the vertical direction inside the chimney (2), and the multiple third baffles (15) form a second tortuous channel inside the chimney (2).

7. The high-temperature flue gas waste heat boiler according to claim 1, characterized in that: The S-shaped smoke guide pipe (4) includes multiple vertically arranged pipe bodies, and heat dissipation fins (16) are provided between two adjacent pipe bodies, and the heat dissipation fins (16) are connected to the surface of the chimney (2).

8. The high-temperature flue gas waste heat boiler according to claim 1, characterized in that: A filter screen (17) is provided between the top of the chimney (2) and the exhaust pipe (3).

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