A heating furnace device for improving thermal efficiency
By employing technologies such as staged combustion structure and internal recirculation, the problems of low thermal energy utilization and high pollutant emissions in traditional heating furnaces have been solved, achieving complete combustion and improved stability of fuel, resulting in efficient and environmentally friendly combustion.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- MENGJIN HONGYUN FORGING EQUIP MFG CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-07-03
AI Technical Summary
Traditional heating furnaces suffer from problems such as low thermal energy utilization, incomplete combustion, and high pollutant emissions. In particular, the flame is unstable and prone to extinguishing when operating at low loads, which affects energy utilization and environmental protection standards.
The burner, which adopts a staged combustion structure, includes a primary air passage and a secondary air passage. Combined with an internal recirculation structure, swirler, swirler nozzle, premixing chamber, and ultrasonic atomization device, it promotes complete fuel combustion, suppresses NOx formation, and improves combustion efficiency and stability through multi-stage air supply and flue gas recirculation.
It achieves complete combustion of fuel, improves thermal efficiency, reduces pollutant emissions, and maintains flame stability, especially under low load, thus improving the safety and environmental performance of the combustion system.
Smart Images
Figure CN224454602U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of heating furnace technology, specifically a heating furnace device for improving thermal efficiency. Background Technology
[0002] Traditional heating furnaces suffer from low thermal energy utilization, incomplete combustion, and high pollutant emissions during fuel combustion, severely hindering the improvement of energy efficiency and the achievement of environmental standards. The low combustion efficiency primarily stems from insufficient fuel-air mixing, crude combustion process control, and the formation of large amounts of nitrogen oxides (NOx) due to localized high temperatures. Furthermore, unstable flames and easy flameout during low-load operation also affect the furnace's safety. Summary of the Invention
[0003] The technical problem to be solved by this application is to overcome the existing defects and provide a heating furnace device with improved thermal efficiency, which can effectively solve the problems in the background art.
[0004] To achieve the above objectives, this application provides the following technical solution: a heating furnace device for improving thermal efficiency, comprising a furnace body, a burner disposed within the furnace body, the burner employing a staged combustion structure, the burner including a primary air channel for supplying primary air, the primary air channel being mixed with fuel at the burner head for preliminary combustion; and a secondary air channel for supplying secondary air, the secondary air channel being disposed in the downstream region of the burner for further completing the combustion process.
[0005] As a preferred technical solution of this application, the burner further includes an internal recirculation structure, which includes a baffle plate disposed inside the burner, located at the end of the burner, and the other end of the baffle plate extending to the beginning of the burner.
[0006] As a preferred embodiment of this application, the burner further includes a swirler, which is installed inside the burner.
[0007] As a preferred embodiment of this application, the burner is also equipped with a nozzle having swirl vanes.
[0008] As a preferred technical solution of this application, the burner front end is provided with a premixing chamber, which is located at the front end of the burner.
[0009] As a preferred technical solution of this application, a fuel distributor is provided on the premixing chamber, and the fuel distributor consists of conveying pipes evenly distributed around the outer end of the premixing chamber.
[0010] As a preferred technical solution of this application, an ultrasonic atomizing device is provided on the outside of the burner, which is located at the front end of the cyclone separator.
[0011] Compared with the prior art, the beneficial effects of this application are as follows: This application divides the combustion process into multiple stages, effectively controls the air supply ratio of different stages, avoids excessively high initial temperature, inhibits NOx formation, and promotes complete combustion of fuel. The internal flue gas recirculation structure uses a flow guiding device to guide some high-temperature flue gas back to the combustion front end, which not only increases the temperature of the combustion initiation zone and enhances ignition and stability, but also inhibits the further formation of NOx by diluting the oxygen concentration. The swirler and the nozzle with swirl vanes work together to improve the uniformity of fuel-air mixing, prevent local rich or lean combustion, and prolong the residence time of fuel in the combustion zone, thereby improving combustion efficiency. The use of the premixing chamber and fuel distributor allows the fuel to be fully mixed with air before entering the main combustion zone, further improving the uniformity of the flame and the ignition success rate. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this application;
[0013] Figure 2 This is the main view of this application;
[0014] Figure 3 This is the left view of this application;
[0015] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA.
[0016] In the diagram: 1 Furnace body, 2 Burner, 3 Primary air duct, 4 Secondary air duct, 5 Guide plate, 6 Cyclone separator, 7 Nozzle, 8 Premixing chamber. Detailed Implementation
[0017] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application (for ease of description and understanding, hereinafter referred to as...), Figure 2 (The above is described above). All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.
[0018] Please see Figure 1-4 This application provides a technical solution: a heating furnace device with high heating efficiency, including a furnace body 1, a burner 2 disposed in the furnace body 1, the burner 2 adopts a staged combustion structure, the burner 2 includes a primary air channel 3 for supplying primary air, the primary air channel 3 and fuel are mixed in the head of the burner 2 for preliminary combustion; and a secondary air channel 4 for supplying secondary air, the secondary air channel 4 is disposed in the downstream area of the burner 2 for further completing the combustion process.
[0019] The furnace body 1 is the main structure of the entire heating furnace device, which is used to house the burner 2, the fuel combustion process, and the high-temperature flue gas flow space. It provides the sealed space required for fuel combustion; it carries and transfers the heat energy generated by combustion to the heated material or medium, isolates the external environment, and prevents heat loss and leakage of harmful gases. The furnace body 1 is equipped with an insulation layer on the outside to reduce heat loss.
[0020] Burner 2 is responsible for mixing fuel and air in a certain proportion and igniting them to produce a high-temperature flame, providing a stable heat source for furnace body 1. The burner 2 adopts a staged combustion structure, which divides the combustion process into multiple stages to improve combustion efficiency and reduce pollutant emissions.
[0021] Specifically, it includes a primary air passage 3 and a secondary air passage 4. The primary air passage 3 is mainly used to supply the air required in the initial stage of combustion. This part of the air is mixed with the fuel at the head of the burner 2 to form a combustible mixture and participate in the initial combustion reaction. The primary air accounts for 60%-70% of the total combustion air. It is fully mixed with the fuel before the start of combustion to ensure stable ignition.
[0022] The secondary air duct 4 is located downstream of the burner 2 to supplement the oxygen required in the later stage of combustion, promote complete combustion of fuel, reduce unburned carbon and CO emissions, and delay the addition of secondary air to avoid excessively high initial combustion temperature leading to NOx generation. It enters the furnace through the side nozzle to enhance turbulent mixing and plays a key role in the oxidation reaction in the later stage of combustion, thereby improving the overall combustion efficiency.
[0023] Furthermore, the burner 2 also includes an internal recirculation structure, which includes a baffle 5 disposed inside the burner 2, located at the end of the burner 2, with its other end extending to the beginning of the burner 2.
[0024] The guide plate 5 guides some of the high-temperature flue gas from the end of the burner 2 back to the front end of the burner 2 (i.e., the combustion initiation zone), forming an internal flue gas recirculation path.
[0025] The recirculated high-temperature flue gas can increase the temperature in the initial combustion zone, helping the fuel and primary air reach their ignition point more quickly. Under low load or low temperature conditions, the recirculated flue gas provides heat support, prevents flame extinction, and improves combustion stability. Because the recirculated flue gas has a lower oxygen content and a higher proportion of inert gases such as nitrogen and CO2, it can dilute the oxygen concentration in the combustion zone, thereby inhibiting the formation of high-temperature NOx. Some unburned products re-enter the combustion reaction with the flue gas recirculation, improving combustion efficiency.
[0026] Furthermore, the burner 2 also includes a swirler 6, which is installed inside the burner 2.
[0027] The swirler 6 is a component inside the burner 2 used to enhance the uniformity of fuel-air mixing. Through its guiding structure, it causes the airflow entering the burner 2 to rotate, thereby forming a stable swirling field. This improves the mixing efficiency of fuel and air and extends the residence time of fuel in the combustion zone.
[0028] The rotating airflow generated by the cyclone separator 6 can fully mix the fuel with the primary air, improve the mixing uniformity, and avoid local rich or poor combustion. The recirculation zone formed by the rotating airflow can guide the high-temperature flue gas back to the combustion initiation area, which helps ignition and maintain flame stability, especially when operating at low load.
[0029] Furthermore, the burner 2 is also equipped with a nozzle 7 with swirl vanes.
[0030] The swirl vanes in the nozzle 7 break the liquid fuel into smaller droplets, increasing the contact area between the fuel and air, thereby improving combustion efficiency. The rotating airflow generated by the swirl vanes allows the fuel and air to mix more thoroughly, forming a uniform combustible mixture and ensuring stable combustion.
[0031] Nozzle 7 adopts a spiral structure.
[0032] Furthermore, the burner 2 is provided with a premixing chamber 8 at its front end, and the premixing chamber 8 is located at the front end of the burner 2.
[0033] Within the premixing chamber 8, the fuel and primary air have sufficient time and space to undergo preliminary mixing, forming a homogeneous combustible mixture, which helps improve combustion efficiency and ensures more complete combustion.
[0034] A uniformly mixed fuel-air mixture is easier to ignite and has a faster flame propagation speed, thus improving the success rate and stability of ignition.
[0035] The premix chamber 8 effectively reduces the generation of pollutants such as CO and nitrogen oxides (NOx) by optimizing the fuel-air mixing ratio, especially by avoiding local fuel-rich or oxygen-deficient zones.
[0036] Furthermore, a fuel distributor is provided on the premixing chamber 8, which consists of conveying pipes evenly distributed around the outer end of the premixing chamber 8.
[0037] The fuel distributor is an assembly used to uniformly deliver fuel to the premixing chamber 8. Through multiple delivery pipes evenly distributed along the outer circumference of the premixing chamber 8, uniform spatial diffusion of fuel is achieved, ensuring a more even mixing of fuel and air.
[0038] Multiple delivery pipes are arranged in a circle around the premixing chamber 8, injecting fuel into the premixing chamber 8 from multiple directions to avoid the problem of local fuel concentration being too high or too low.
[0039] Evenly distributed fuel mixes more easily with primary air to form a uniform combustible mixture, which helps stabilize combustion and improve combustion efficiency.
[0040] Furthermore, an ultrasonic atomizing device is provided on the outside of the burner 2, which is located at the front end of the cyclone separator 6.
[0041] Ultrasonic atomizing devices use high-frequency vibrations to break liquid fuel into micron-sized droplets, greatly increasing the surface area of the fuel and facilitating faster and more complete evaporation and combustion.
[0042] Efficiently atomized fuel is easier to ignite, reducing the energy required for ignition, improving the response speed and stability of the combustion system, and avoiding localized fuel-rich or oxygen-deficient zones, thereby effectively reducing the formation of incomplete combustion products (such as CO) and nitrogen oxides (NOx).
[0043] During operation: Turn on the external fan to pre-purge air into the furnace body 1. The purging time is generally 3-5 minutes, set according to the volume of the furnace body 1. This removes any combustible gases that may be present in the furnace chamber to prevent ignition and deflagration. Start the fuel supply system, and the liquid fuel enters the ultrasonic atomizing device. The ultrasonic atomizing device breaks the high-viscosity fuel into micron-sized droplets, increasing the evaporation rate. The atomized fuel is transported to the premixing chamber 8 through the fuel distributor and then delivered into the premixing chamber 8 by multiple evenly distributed circumferential delivery pipes. The primary air channel 3 is opened, supplying approximately 60%-70% of the primary air. The atomized fuel and primary air are fully mixed in the premixing chamber 8 to form a combustible mixture. The mixed gas enters the burner head 2. Ignition is achieved by an ignition device; the initial flame rapidly expands and stabilizes in the rotating airflow generated by the cyclone separator 6; the guide plate 5 guides some of the high-temperature flue gas backflow, increasing the temperature of the combustion zone and enhancing ignition stability; the secondary air channel 4 opens with a delay to delay the addition of gas and avoid NOx generation due to excessively high initial temperature; the secondary air enters the furnace chamber of the furnace body 1 through the side nozzle, enhancing turbulent mixing and promoting complete combustion; the cyclone separator 6 continues to work, enhancing the mixing effect between air and fuel; the nozzle 7 with swirl vanes further refines the fuel droplets, forming a uniform flame shape; the internal recirculation structure continuously draws back high-temperature flue gas through the guide plate 5, maintaining combustion stability under low load; thus achieving complete combustion of fuel and improving combustion efficiency.
[0044] 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.
Claims
1. A heating furnace device for improving thermal efficiency, comprising a furnace body (1), a burner (2) arranged in the furnace body (1), characterized in that, The burner (2) adopts a staged combustion structure. The burner (2) includes a primary air passage (3) for supplying primary air, which mixes with fuel at the head of the burner (2) for initial combustion; a secondary air passage (4) for supplying secondary air, which is located in the downstream area of the burner (2) for further combustion. The burner (2) also includes an internal recirculation structure, which includes a baffle (5) located at the end of the burner (2) and its other end extending to the head of the burner (2).
2. A heating furnace device for improving thermal efficiency according to claim 1, wherein The burner (2) also includes a swirler (6) which is installed inside the burner (2).
3. The heating furnace device for improving thermal efficiency according to claim 2, characterized in that, The burner (2) is also equipped with a nozzle (7) with a swirl vane.
4. A heating furnace device for improving thermal efficiency according to claim 1, wherein The burner (2) is provided with a premixing chamber (8) at the front end, and the premixing chamber (8) is located at the front end of the burner (2).
5. A heating furnace apparatus for improving thermal efficiency according to claim 4, wherein A fuel distributor is provided on the premixing chamber (8), which consists of conveying pipes evenly distributed around the outer end of the premixing chamber (8).
6. A heating furnace apparatus for improving thermal efficiency according to claim 1, wherein An ultrasonic atomizing device is provided on the outside of the burner (2), which is located at the front end of the cyclone separator (6).