Flue gas three-return-stroke fuel gas organic heat carrier furnace
By designing a flue gas three-return gas organic heat carrier furnace, using a three-layer coil structure and energy-saving device, the traditional organic heat carrier furnace has solved the shortcomings in thermal efficiency, floor area and stability, and achieved efficient and safe heating effect.
Patent Information
- Application Number
- CN202421727936.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-07-22
AI Technical Summary
Traditional single-back or double-back organic heat carrier furnaces are difficult to meet the needs of modern industrial production in terms of thermal efficiency, floor area and operating stability.
A flue gas three-return gas organic heat carrier furnace is designed, adopting a three-layer coil structure, including an inner coil, a middle coil and an outer coil. The flue gas is fully heat-exchanged in the furnace through a three-return design, and an energy-saving device is equipped to further recover waste heat.
It improves thermal efficiency, reduces heat loss, ensures uniform heat transfer and high-precision temperature control, reduces construction costs, and improves equipment safety and space utilization.
Smart Images
Figure CN223179033U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of boilers, and specifically to a flue gas three - return gas - fired organic heat carrier furnace. Background Art
[0002] In modern industrial production, the heating process is an indispensable part of many technological processes. Although traditional steam boilers are widely used, under certain specific process conditions, such as occasions that require uniform and stable heating with high temperature control requirements, their use is restricted to a certain extent. Steam boilers have problems such as high steam pressure, large heat loss, and complex systems. Moreover, for processes that do not allow direct flame heating, their applicability is further reduced. Therefore, it is particularly important to find a more efficient, safe, and energy - saving heating device.
[0003] As a new type of heating device, the organic heat carrier furnace (also known as the heat - conducting oil furnace) has gradually been widely used in industrial production due to its advantages of low pressure and high temperature, high thermal efficiency, and stable operation. Compared with traditional steam boilers, the organic heat carrier furnace uses heat - conducting oil as the medium and transfers heat energy to the heat - using equipment through liquid - phase circulation. It can not only obtain a higher working temperature under a lower operating pressure but also achieve continuous heat transfer and precise control, meeting the process temperature and high - precision temperature control requirements set in the production process.
[0004] However, with the continuous improvement of the performance requirements of heating equipment in industrial production, traditional single - return or double - return organic heat carrier furnaces are difficult to meet the requirements in terms of thermal efficiency, floor area, and operation stability. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a flue gas three - return gas - fired organic heat carrier furnace to solve the problem that with the continuous improvement of the performance requirements of heating equipment in industrial production, traditional single - return or double - return organic heat carrier furnaces are difficult to meet the requirements in terms of thermal efficiency, floor area, and operation stability as mentioned in the above - mentioned background art.
[0006] To achieve the above purpose, the utility model provides a flue gas three - return gas - fired organic heat carrier furnace, including a furnace body. A burner is installed at one end of the furnace body, an outlet header is installed at the top of one end of the furnace body, and an oil return header is installed at the bottom of the other end of the furnace body. Three layers of coil pipes are arranged inside the furnace body, which are the inner coil pipe, the middle coil pipe, and the outer coil pipe from inside to outside in sequence. A smoke exhaust port is arranged at the top of one end of the furnace body, and a smoke exhaust pipe is connected to the outside of the smoke exhaust port. A first return path is arranged inside the inner coil pipe, a second return path is arranged between the inner coil pipe and the middle coil pipe, and a third return path is arranged between the middle coil pipe and the outer coil pipe.
[0007] Preferably, a base is installed at the bottom of the furnace body.
[0008] Preferably, an explosion-proof door is installed at one end of the furnace body away from the burner.
[0009] Preferably, a heat-insulating layer is provided on the inner wall of the furnace body.
[0010] Preferably, a tee is installed at the outer end of the exhaust pipe. One joint of the tee is connected to a chimney, and the other joint of the tee is connected to an economizer.
[0011] Preferably, the upper ends of the three-layer coils are connected to the outlet header, and the lower ends of the three-layer coils are connected to the return oil header.
[0012] Preferably, the length of the inner coil is less than the length of the middle coil, so that a folding space is formed at one end of the first return stroke near the second return stroke.
[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0014] 1. In this flue gas three-pass gas-fired organic heat carrier furnace, the three-pass design enables the flue gas to be fully heat-exchanged in the furnace, greatly improving the thermal efficiency. Compared with the traditional single-pass or double-pass design, this furnace type can more effectively utilize the waste heat of the flue gas, reduce heat loss, and thus achieve energy conservation and consumption reduction. At the same time, the equipped economizer further recovers and utilizes the heat in the flue gas, further improving the energy utilization rate. Through the liquid-phase circulation heating method, the heat transfer oil flows evenly in the three-layer coils, ensuring the stability and uniformity of heat transfer, and thus meeting the requirements of process temperature and high-precision temperature control in the production process.
[0015] 2. In this flue gas three-pass gas-fired organic heat carrier furnace, the heat-insulating layer design on the inner wall reduces the temperature of the outer surface of the furnace body, improving the safety of operators. The large-diameter combustion chamber ensures the full combustion of fuel and reduces the emission of harmful substances. The design of the three-layer coils makes the furnace body structure more compact, with a small floor area, suitable for installation environments with limited space. This not only saves land resources but also reduces construction costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model;
[0017] Figure 2 is a schematic side view structure diagram of the present utility model;
[0018] Figure 3 is a schematic top view structure diagram of the present utility model.
[0019] The meanings of the various reference numerals in the figures are as follows:
[0020] 1. Furnace body; 11. First return; 12. Explosion-proof door; 13. Heat insulation layer; 14. Smoke exhaust port; 15. Base; 16. Second return; 17. Third return; 2. Burner; 3. Inner coil; 4. Middle coil; 5. Outer coil; 6. Outlet header; 7. Return oil header; 8. Smoke exhaust pipe; 9. Economizer; 10. Chimney. Detailed implementation manners
[0021] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0022] The present utility model provides a flue gas three-return gas-fired organic heat carrier furnace, as Figures 1 - 3 shown, which includes a furnace body 1. A burner 2 is installed at one end of the furnace body 1. An outlet header 6 is installed at the top of one end of the furnace body 1. A return oil header 7 is installed at the bottom of the other end of the furnace body 1. Three layers of coils are arranged inside the furnace body 1, which are the inner coil 3, the middle coil 4 and the outer coil 5 in sequence from inside to outside. A smoke exhaust port 14 is arranged at the top of one end of the furnace body 1. A smoke exhaust pipe 8 is connected to the outside of the smoke exhaust port 14. A first return 11 is arranged inside the inner coil 3. A second return 16 is arranged between the inner coil 3 and the middle coil 4. A third return 17 is arranged between the middle coil 4 and the outer coil 5. The three layers of coils (inner coil 3, middle coil 4, outer coil 5) arranged inside the furnace body and the three-return flue gas flow path (first return 11, second return 16, third return 17) formed therebetween greatly prolong the residence time of the flue gas in the furnace, enabling the heat in the flue gas to be fully transferred to the heat-conducting oil, thereby improving the heat exchange efficiency. This design effectively reduces heat loss and improves the thermal efficiency of the entire heating system.
[0023] The heat-conducting oil circulates in the three layers of coils, and each layer of coil participates in the heat exchange process, ensuring the uniform distribution of heat in the entire system. This design enables the temperature of the heat-conducting oil output from the outlet header 6 to be stable, meeting the strict requirements for temperature control in the production process, especially for process occasions that require high-precision temperature control. The layout of the three layers of coils is compact and reasonable, not only improving the heat exchange efficiency, but also making the overall structure of the furnace body more compact, reducing the floor area. This is particularly important for installation environments with limited space, which can reduce construction costs and improve land utilization rate. The design of the smoke exhaust port 14 and the smoke exhaust pipe 8 at one end of the furnace body ensures the smooth discharge of the flue gas, avoiding potential safety hazards caused by smoke accumulation in the furnace.
[0024] Possible overpressure and overtemperature conditions within the furnace can be monitored and protected in real time by supporting safety protection devices (such as overtemperature alarms and overpressure protection, which are not directly mentioned but may exist in actual applications), ensuring safe and reliable operation of the equipment. The furnace design takes into account convenient maintenance. For example, key components such as the burner 2, outlet header 6, and return oil header 7 are all easily accessible for daily inspection and maintenance. In addition, the three-layer coil structure is relatively simple and straightforward, facilitating troubleshooting and component replacement.
[0025] In this embodiment, a base 15 is installed at the bottom of the furnace body 1 to ensure that the bottom of the furnace body 1 is supported and fixed.
[0026] Specifically, an explosion-proof door 12 is installed at one end of the furnace body 1 away from the burner 2, which has a good explosion-proof effect.
[0027] Furthermore, the inner wall of the furnace body 1 is provided with a heat-insulating layer 13 for heat preservation.
[0028] Furthermore, a tee is installed at the outer end of the smoke exhaust pipe 8, one joint of the tee is connected to the chimney 10, and the other joint of the tee is connected to the economizer 9 for further recovering the heat of the flue gas.
[0029] Furthermore, the upper end of the three-layer coil is connected to the outlet header 6, and the lower end of the three-layer coil is connected to the oil return header 7, which facilitates the input and output of the medium.
[0030] Furthermore, the length of the inner coil 3 is shorter than that of the middle coil 4, so that a turning space is formed near one end of the first return 11 to the second return 16, which facilitates the smooth turning back of the smoke.
[0031] When the three-pass flue gas-fired organic heat carrier furnace of this utility model is in use, the high-temperature flue gas first enters the first pass 11, i.e., the space inside the inner coil 3. Here, the flue gas undergoes an initial heat exchange with the thermal oil within the inner coil 3, transferring some of the heat to the thermal oil. As the flue gas flows, its temperature gradually decreases, while the thermal oil is heated and raised.
[0032] After passing through the first pass 11, the flue gas returns to the second pass 16, located between the inner coil 3 and the middle coil 4. Here, the flue gas continues to exchange heat with the thermal oil in the middle coil 4, releasing further heat. The flue gas then returns again to the third pass 17, located between the middle coil 4 and the outer coil 5, for a final heat exchange with the thermal oil in the outer coil 5. This three-pass design significantly extends the flue gas's residence time within the furnace, ensuring sufficient heat transfer.
[0033] During the heat exchange process, the heated heat-conducting oil circulates in the three-layer coiled pipes (inner coiled pipe 3, middle coiled pipe 4, outer coiled pipe 5). Each layer of the coiled pipe participates in the heat exchange, ensuring the uniform distribution of heat in the entire system. The heated heat-conducting oil finally converges at the top outlet header 6 at one end of the furnace body 1 and is transported to the heat-using equipment through pipelines. After completing the heat transfer, the heat-conducting oil returns to the bottom oil return header 7 at the other end of the furnace body 1, forming a closed-loop cycle.
[0034] The low-temperature flue gas after three-pass heat exchange is discharged from the top smoke outlet 14 at one end of the furnace body 1 and enters the pipeline system equipped with a three-way through the smoke exhaust pipe 8. One joint of the three-way is connected to the chimney 10 to discharge the flue gas into the atmosphere; the other joint is connected to the economizer 9 to further recover the waste heat in the flue gas by using the economizer and improve the energy utilization rate.
[0035] The furnace body is internally equipped with safety protection devices (such as over-temperature alarm, over-pressure protection, etc.), which monitor the conditions inside the furnace in real time to ensure the safe and reliable operation of the equipment. At the same time, the design of the furnace body takes into account the convenience of maintenance. Key components such as the burner 2, outlet header 6, and oil return header 7 are all located in easily accessible positions, facilitating daily inspection and maintenance. In addition, the structure of the three-layer coiled pipes is simple and clear, which is conducive to troubleshooting and component replacement.
[0036] Finally, it should be noted that for the burner 2, economizer 9, etc. in this embodiment, the electronic components in the above components are all general standard components or components known to those skilled in the art. Their structures and principles can be learned from technical manuals by those skilled in the art or obtained through conventional experimental methods. At the idle places of this device, all the above electrical components are respectively connected through wires. The specific connection means should refer to the sequence of work among the electrical components in the above working principle to complete the electrical connection, and they are all well-known technologies in the art.
[0037] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. A three-pass flue gas gas-fired organic heat carrier boiler, comprising a furnace body (1), characterized in that: One end of the furnace body (1) is equipped with a burner (2). At the top of one end of the furnace body (1), an outlet header (6) is installed. At the bottom of the other end of the furnace body (1), an oil return header (7) is installed. Inside the furnace body (1), there are three layers of coiled pipes, which are the inner coiled pipe (3), the middle coiled pipe (4), and the outer coiled pipe (5) in sequence from inside to outside. At the top of one end of the furnace body (1), a smoke outlet (14) is provided. Outside the smoke outlet (14), a smoke exhaust pipe (8) is connected. Inside the inner coiled pipe (3), a first return path (11) is provided. Between the inner coiled pipe (3) and the middle coiled pipe (4), a second return path (16) is provided. Between the middle coiled pipe (4) and the outer coiled pipe (5), a third return path (17) is provided; The upper ends of the three layers of coiled pipes are connected to the outlet header (6), and the lower ends of the three layers of coiled pipes are connected to the oil return header (7); The length of the inner coiled pipe (3) is less than the length of the middle coiled pipe (4), so that a folding space is formed at one end of the first return path (11) near the second return path (16).
2. The flue gas three-pass gas-fired organic heat carrier furnace according to claim 1, wherein: A base (15) is installed at the bottom of the furnace body (1).
3. The flue gas three-pass gas-fired organic heat carrier furnace according to claim 1, wherein: An explosion-proof door (12) is installed at one end of the furnace body (1) away from the burner (2).
4. The flue gas three-pass gas-fired organic heat carrier furnace according to claim 1, characterized in that: A heat-insulating layer (13) is provided on the inner wall of the furnace body (1).
5. The flue gas three-pass gas-fired organic heat carrier furnace according to claim 1, characterized in that: A tee is installed at the outer end of the smoke exhaust pipe (8). One joint of the tee is connected to a chimney (10), and the other joint of the tee is connected to an economizer (9).