Boiler with flue gas heat energy recovery function
By installing reflux pipes and spiral heat exchange tubes in the boiler, the problem of heat energy waste caused by high-temperature flue gas emissions in traditional boilers is solved, and efficient heat energy recovery and utilization are achieved.
Patent Information
- Application Number
- CN202520435380.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-03-13
AI Technical Summary
Traditional boilers generate a large amount of high-temperature flue gas during operation, resulting in the underutilization of thermal energy resources and energy waste.
The boiler structure is designed with reflux tubes and spiral heat exchange tubes to improve thermal energy utilization by recovering high-temperature flue gas and exchanging heat with boiler water multiple times.
Significantly reduce waste of thermal energy resources, improve boiler heating efficiency, and enhance resource utilization.
Smart Images
Figure CN223795304U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of industrial boiler technology, specifically a boiler with flue gas heat recovery. Background Technology
[0002] Industrial boilers are indispensable energy conversion equipment in industrial production and daily life. They mainly generate heat through fuel combustion or electrical energy conversion, thereby providing the steam or hot water required for various application scenarios. As an important source of heat energy, industrial boilers play a key role in many fields such as manufacturing, chemical industry, and heating, effectively promoting the rational use and conversion of energy and meeting the diverse needs of society for heat energy resources.
[0003] However, traditional boilers often produce a large amount of high-temperature flue gas during operation. This flue gas contains abundant thermal energy resources that are not effectively utilized, resulting in a significant waste of energy and indicating room for improvement. Utility Model Content
[0004] To address the shortcomings of existing technologies, this application provides a boiler with flue gas heat recovery, which can recover and reuse the high-temperature flue gas emitted during boiler operation, significantly reducing the waste of heat energy resources, improving the heating efficiency of the boiler, and enhancing the overall resource utilization rate of the boiler. This solves the problem that traditional boilers generate a large amount of high-temperature flue gas emissions during operation, resulting in the underutilization of heat energy resources and the waste of a large amount of energy.
[0005] To achieve the above objectives, this application provides the following technical solution: A boiler with flue gas heat recovery, comprising a main furnace body, a combustion chamber inside the main furnace body, a recirculation chamber fixedly connected to one end of the combustion chamber, the outer surface of the recirculation chamber fixedly connected to the inner wall of the main furnace body, a front smoke box fixedly connected to the end of the main furnace body away from the recirculation chamber, a rear smoke box fixedly connected to the end of the main furnace body near the recirculation chamber, an exhaust pipe fixedly connected to the top of the rear smoke box, a return pipe fixedly connected to the top of the exhaust pipe, a heat exchange tube fixedly connected inside the main furnace body, the heat exchange tube being spiral-shaped, the air inlet end of the heat exchange tube penetrating the rear smoke box, the end of the return pipe away from the exhaust pipe fixedly connected to the air inlet end of the heat exchange tube, the air outlet end of the heat exchange tube penetrating the front smoke box, an exhaust stack fixedly connected to the top of the front smoke box, and the air outlet end of the heat exchange tube fixedly inserted into the interior of the exhaust stack.
[0006] The above solution addresses the issue that traditional boilers generate a large amount of high-temperature flue gas emissions during operation, resulting in underutilization of thermal energy resources and significant energy waste. By installing return pipes and heat exchange pipes, the high-temperature flue gas emitted during boiler operation can be recovered and reused, significantly reducing the waste of thermal energy resources, improving the boiler's heating efficiency, and enhancing the overall resource utilization rate of the boiler.
[0007] Furthermore, a PLC controller, a temperature sensor, and a pressure sensor are provided on the outer surface of the main furnace body.
[0008] Through the above scheme, the temperature sensor can detect the temperature of the boiler water, the pressure sensor can detect the pressure inside the boiler, and the PLC controller, as the central processing unit of the boiler, is responsible for receiving real-time data from the temperature and pressure sensors and monitoring and adjusting the operating status of the boiler according to the preset program logic.
[0009] Furthermore, the main furnace body is internally connected to multiple first smoke pipes, which connect the combustion chamber and the front smoke box. The main furnace body is internally connected to multiple second smoke pipes, which connect the front smoke box and the rear smoke box.
[0010] With the above scheme, the high-temperature flue gas generated during combustion can flow into the front smoke box through the first smoke pipe, then into the rear smoke box through the second smoke pipe, and finally be discharged through the exhaust pipe. When the high-temperature flue gas flows inside the first and second smoke pipes, it will exchange heat with the boiler water, optimize the heating effect of the boiler water, and improve the heating efficiency of the boiler.
[0011] Furthermore, the combustion chamber has a combustion port at the end away from the reburning chamber, and the interior of the front smoke box has a combustion channel that communicates with the combustion port.
[0012] The above scheme allows the burner to be placed through the combustion channel and the combustion chamber to be combusted through the combustion port.
[0013] Furthermore, a water inlet pipe is fixedly connected inside the main furnace body, a valve is provided on the outer circumference of the water inlet pipe, and a water pump is provided at the bottom of the water inlet pipe.
[0014] Through the above scheme, the water pump can provide the necessary power to the water in the inlet pipe, ensuring that the water can smoothly enter the boiler for heating, and the valve on the inlet pipe can control the water flow and speed.
[0015] Furthermore, a drain pipe is fixedly connected inside the main furnace body, the drain pipe passes through the rear smoke box, and a valve is provided on the outer circumference of the drain pipe.
[0016] The above method allows for drainage of the boiler via a drain pipe, and the opening and closing of the drain pipe can be controlled by a valve on the drain pipe.
[0017] Furthermore, a safety valve pipe is provided at the top of the main furnace body, and a steam valve pipe is provided at the top of the main furnace body.
[0018] Through the above scheme, the safety valve pipe can automatically release pressure when the internal pressure of the boiler is too high, preventing the boiler from being damaged due to overpressure, while the steam valve pipe is used to control the discharge of steam, ensuring that steam can be output smoothly when needed.
[0019] Furthermore, the heat exchange tube is made of stainless steel, and its outer surface is coated with an anti-oxidation coating.
[0020] Through the above solution, the stainless steel heat exchange tube has excellent corrosion resistance and high temperature stability, and can maintain stable performance under harsh working conditions for a long time. The anti-oxidation coating further enhances the durability of the heat exchange tube and reduces the performance degradation caused by oxidation.
[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects:
[0022] This boiler, equipped with flue gas heat recovery, can recover and reuse the high-temperature flue gas emitted during boiler operation by setting up return pipes and heat exchange pipes, and then exchange heat with the boiler water again. This significantly reduces the waste of thermal energy resources, improves the heating efficiency of the boiler, and enhances the overall resource utilization rate of the boiler. By setting the heat exchange pipes in a spiral shape, the contact area between the heat exchange pipes and the boiler water is increased, further optimizing the heat exchange effect of the heat exchange pipes. This solves the problem that traditional boilers generate a large amount of high-temperature flue gas emissions during operation, resulting in the underutilization of thermal energy resources and the waste of a large amount of energy. Attached Figure Description
[0023] Figure 1 This is a three-dimensional structural diagram of the entire application;
[0024] Figure 2 This is a partial sectional view of the structure of this application;
[0025] Figure 3 This is a partial cross-sectional front view of the structure of this application;
[0026] Figure 4 This is a structural diagram of the main furnace body of this application.
[0027] In the picture:
[0028] 1. Main furnace body; 2. Combustion chamber; 3. Recirculation chamber; 4. First smoke pipe; 5. Front smoke box; 6. Rear smoke box; 7. Second smoke pipe; 8. Exhaust pipe; 9. Return pipe; 10. Heat exchange pipe; 11. Exhaust stack; 12. PLC controller; 13. Temperature sensor; 14. Pressure sensor; 15. Combustion port; 16. Combustion channel; 17. Water inlet pipe; 18. Drain pipe; 19. Safety valve pipe; 20. Steam valve pipe. Detailed Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0030] Please see Figure 1 , Figure 2 and Figure 4 This embodiment of a boiler with flue gas heat recovery includes a main furnace body 1. The main furnace body 1 has a combustion chamber 2 inside. One end of the combustion chamber 2 is fixedly connected to a recirculation chamber 3. The outer surface of the recirculation chamber 3 is fixedly connected to the inner wall of the main furnace body 1. The end of the main furnace body 1 away from the recirculation chamber 3 is fixedly connected to a front smoke box 5. The end of the main furnace body 1 near the recirculation chamber 3 is fixedly connected to a rear smoke box 6. The top of the rear smoke box 6 is fixedly connected to an exhaust pipe 8. The top of the exhaust pipe 8 is fixedly connected to a return pipe 9. The inside of the main furnace body 1 is fixedly connected to a heat exchange tube 10. The heat exchange tube 10 is spiral in shape. The air inlet end of the heat exchange tube 10 passes through the rear smoke box 6. The end of the return pipe 9 away from the exhaust pipe 8 is fixedly connected to the air inlet end of the heat exchange tube 10. The air outlet end of the heat exchange tube 10 passes through the front smoke box 5. The top of the front smoke box 5 is fixedly connected to an exhaust stack 11. The air outlet end of the heat exchange tube 10 is fixedly inserted into the inside of the exhaust stack 11.
[0031] Please see Figure 1 The outer surface of the main boiler body 1 is equipped with a PLC controller 12, a temperature sensor 13, and a pressure sensor 14. The temperature sensor 13 can detect the temperature of the boiler water, and the pressure sensor 14 can detect the pressure inside the boiler. The PLC controller 12, as the central processing unit of the boiler, is responsible for receiving real-time data from the temperature sensor 13 and the pressure sensor 14, and monitoring and adjusting the operating status of the boiler according to the preset program logic.
[0032] Please see Figure 2 , Figure 3 and Figure 4Multiple first smoke pipes 4 are fixedly connected inside the main furnace body 1. The first smoke pipes 4 connect the combustion chamber 3 and the front smoke box 5. Multiple second smoke pipes 7 are fixedly connected inside the main furnace body 1. The second smoke pipes 7 connect the front smoke box 5 and the rear smoke box 6. The high-temperature flue gas generated during combustion can flow into the front smoke box 5 through the first smoke pipes 4, then flow into the rear smoke box 6 through the second smoke pipes 7, and finally be discharged through the exhaust pipe 8. When the high-temperature flue gas flows inside the first smoke pipes 4 and the second smoke pipes 7, it will exchange heat with the boiler water, optimize the heating effect of the boiler water, and improve the heating efficiency of the boiler.
[0033] Please see Figure 1 , Figure 2 and Figure 3 The combustion chamber 2 is provided with a combustion port 15 at the end away from the combustion chamber 3. The front smoke box 5 is provided with a combustion channel 16, which is connected to the combustion port 15. The burner can be placed through the combustion channel 16 and the combustion operation can be carried out on the combustion chamber 2 through the combustion port 15.
[0034] Please see Figure 1 The main furnace body 1 is fixedly connected to a water inlet pipe 17. A valve is provided on the outer circumference of the water inlet pipe 17. A water pump is provided at the bottom of the water inlet pipe 17. The water pump can provide the necessary power for the water in the water inlet pipe 17 to ensure that the water can smoothly enter the boiler for heating. The valve on the water inlet pipe 17 can control the water flow and speed.
[0035] Please see Figure 2 and Figure 3 The main furnace body 1 is fixedly connected to a drain pipe 18, which passes through the rear smoke box 6. A valve is provided on the outer circumference of the drain pipe 18, which can be used to drain water from the boiler. The opening and closing of the drain pipe 18 can be controlled by the valve on the drain pipe 18.
[0036] Please see Figure 1 , Figure 2 and Figure 3 The top of the main furnace body 1 is equipped with a safety valve pipe 19 and a steam valve pipe 20. The safety valve pipe 19 can automatically release pressure when the pressure inside the boiler is too high, preventing the boiler from being damaged due to overpressure. The steam valve pipe 20 is used to control the discharge of steam, ensuring that steam can be output smoothly when needed.
[0037] Please see Figure 2 and Figure 3 The heat exchange tube 10 is made of stainless steel and its outer surface is coated with an anti-oxidation coating. The stainless steel heat exchange tube 10 has excellent corrosion resistance and high temperature stability, and can maintain stable performance under harsh working conditions for a long time. The anti-oxidation coating further enhances the durability of the heat exchange tube 10 and reduces the performance degradation caused by oxidation.
[0038] This embodiment of a boiler with flue gas heat recovery, by setting up a return pipe 9 and a heat exchange pipe 10, can recover and reuse the high-temperature flue gas emitted during boiler operation, and exchange heat with the boiler water again, significantly reducing the waste of thermal energy resources and improving the heating efficiency of the boiler, thereby improving the overall resource utilization rate of the boiler. By setting the heat exchange pipe 10 in a spiral shape, the contact area between the heat exchange pipe 10 and the boiler water is increased, further optimizing the heat exchange effect of the heat exchange pipe 10, and solving the problem that traditional boilers generate a large amount of high-temperature flue gas emissions during operation, resulting in the underutilization of thermal energy resources and the waste of a large amount of energy.
[0039] It should be noted that the bottom of the main furnace body 1 is equipped with a support frame, which can provide stable support for the entire boiler.
[0040] The working principle of the above embodiments is as follows:
[0041] During boiler operation, the high-temperature flue gas generated by combustion inside combustion chamber 2 passes sequentially through combustion chamber 3, first flue pipe 4, front smoke box 5, and second flue pipe 7, and finally enters rear smoke box 6. It is then discharged from exhaust pipe 8 at the top of rear smoke box 6. As the high-temperature flue gas flows inside first flue pipe 4 and second flue pipe 7, it exchanges heat with boiler water, optimizing the heating effect of the boiler water. The high-temperature flue gas discharged from exhaust pipe 8 enters heat exchange tube 10 through return pipe 9. The high-temperature flue gas entering heat exchange tube 10 will re-circulate into the interior of main furnace body 1 and follow the spiral heat exchange tube 10 in a spiral flow, exchanging heat with boiler water again, reducing the waste of thermal energy resources, further optimizing the boiler heating effect, improving boiler heating efficiency, and thus increasing the heating speed of boiler water. Finally, the high-temperature flue gas that has been reheated by heat exchange tube 10 will be discharged to the outside through exhaust stack 11.
[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0043] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents. Through these designs, the boiler achieves higher thermal efficiency during combustion, effectively improving energy efficiency while reducing environmental pollution.
Claims
1. A boiler with flue gas heat recovery, comprising a main boiler body (1), characterized in that: The main furnace body (1) is provided with a combustion chamber (2) inside. One end of the combustion chamber (2) is fixedly connected to a reburning chamber (3). The outer surface of the reburning chamber (3) is fixedly connected to the inner wall of the main furnace body (1). The end of the main furnace body (1) away from the reburning chamber (3) is fixedly connected to a front smoke box (5). The end of the main furnace body (1) near the reburning chamber (3) is fixedly connected to a rear smoke box (6). The top of the rear smoke box (6) is fixedly connected to an exhaust pipe (8). The top of the exhaust pipe (8) is fixedly connected to a return pipe. (9) A heat exchange tube (10) is fixedly connected inside the main furnace body (1). The heat exchange tube (10) is spiral. The air inlet end of the heat exchange tube (10) passes through the rear smoke box (6). The end of the return pipe (9) away from the exhaust pipe (8) is fixedly connected to the air inlet end of the heat exchange tube (10). The air outlet end of the heat exchange tube (10) passes through the front smoke box (5). An exhaust pipe (11) is fixedly connected to the top of the front smoke box (5). The air outlet end of the heat exchange tube (10) is fixedly inserted into the interior of the exhaust pipe (11).
2. A boiler with flue gas heat recovery according to claim 1, characterized in that: The outer surface of the main furnace body (1) is provided with a PLC controller (12), a temperature sensor (13), and a pressure sensor (14).
3. A boiler with flue gas heat recovery according to claim 1, characterized in that: The main furnace body (1) is fixedly connected to a plurality of first smoke pipes (4), which are connected to the combustion chamber (3) and the front smoke box (5). The main furnace body (1) is fixedly connected to a plurality of second smoke pipes (7), which are connected to the front smoke box (5) and the rear smoke box (6).
4. A boiler with flue gas heat recovery according to claim 1, characterized in that: The combustion chamber (2) is provided with a combustion port (15) at one end away from the reburning chamber (3), and the interior of the front smoke box (5) is provided with a combustion channel (16), which is connected to the combustion port (15).
5. A boiler with flue gas heat recovery according to claim 1, characterized in that: The main furnace body (1) is fixedly connected to a water inlet pipe (17), and a valve is provided on the outer circumference of the water inlet pipe (17). A water pump is provided at the bottom of the water inlet pipe (17).
6. A boiler with flue gas heat recovery according to claim 1, characterized in that: The main furnace body (1) is fixedly connected to a drain pipe (18), which passes through the rear smoke box (6), and a valve is provided on the outer circumference of the drain pipe (18).
7. A boiler with flue gas heat recovery according to claim 1, characterized in that: The top of the main furnace body (1) is provided with a safety valve pipe (19) and a steam valve pipe (20).
8. A boiler with flue gas heat recovery according to claim 1, characterized in that: The heat exchange tube (10) is made of stainless steel, and the outer surface of the heat exchange tube (10) is coated with an anti-oxidation coating.