Auxiliary structure for reducing temperature of fins and combustor
By installing air baffles and narrow slit structures between the burner fins, the airflow velocity is increased, which solves the problems of increased fin temperature and increased nitrogen oxide emissions, achieving a low-cost environmental improvement effect.
Patent Information
- Application Number
- CN202520284860.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-02-21
AI Technical Summary
Increased burner fin temperature leads to faster combustion and increased nitrogen oxide emissions, making it difficult to meet increasingly stringent environmental protection requirements. Especially under secondary air baffle conditions, fin temperature rise has become a key technical challenge.
An air baffle is installed between adjacent fins, with narrow slits on both sides. The structure is reinforced by reinforcing ribs to divert secondary air, thereby increasing the flow rate and reducing the temperature of the fins and combustion gases.
It effectively reduces fin temperature, improves nitrogen oxide emissions, meets environmental protection requirements, has a simple structure and is easy to install, is low in cost, and does not affect combustion conditions.
Smart Images
Figure CN223782857U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of burner technology, and in particular to an auxiliary structure and burner for reducing fin temperature. Background Technology
[0002] During combustion, the burner fins experience temperature increases due to heat radiation and conduction, especially when a secondary air baffle is installed at the bottom of the burner. This increased fin temperature leads to a rise in the gas temperature at the burner nozzle outlet, accelerating gas propagation and intensifying the combustion reaction. The increased combustion speed causes the flame to decrease in height, further exacerbating heat radiation and conduction to the burner fins, further raising their temperature. Excessive fin temperature rise can result in the combustion rate exceeding the gas flow rate, causing burner backfire, burner malfunction, and discoloration and red-hot discoloration of the burner nozzle metal.
[0003] The increased temperature of the burner fins leads to a rise in the combustion chamber temperature, resulting in increased emissions of nitrogen oxides (NOx). NOx is primarily formed when nitrogen and oxygen in the air react at high temperatures. my country's standards for wall-hung boilers specify NOx emission levels, classifying them into five grades. Grade 5 has the lowest emission level (53 mg / kW·h), while Grade 4 has a lower limit of 100 mg / kW·h. Generally, ordinary gas-fired wall-hung boilers and burners in my country emit NOx at Grade 2. As national environmental protection requirements become increasingly stringent, NOx emission standards will continue to rise.
[0004] To reduce nitrogen oxide emissions, in addition to using fully premixed combustion and low-NOx burners to achieve Level 5 emissions, ordinary burners can be modified to achieve Level 4 emissions. Achieving Level 4 emissions with ordinary burners through modification is cost-effective, and can reduce NOx emissions by two levels without altering the original wall-hung boiler structure. Therefore, Level 4 emissions with ordinary burners is currently the most effective way to reduce NOx emissions.
[0005] However, conventional burners reduce nitrogen oxides mainly by increasing the number of fins, reducing the power of each fin, lowering the flame height, and minimizing the contact time between the flame and oxygen under the same power conditions. Among these methods of reducing nitrogen oxides, the temperature rise of the fins is a critical technical challenge. Utility Model Content
[0006] The purpose of this invention is to provide an auxiliary structure and burner for reducing fin temperature.
[0007] The purpose of this utility model can be achieved through the following technical solution: an auxiliary structure for reducing fin temperature, including an air baffle disposed between adjacent fins, wherein a narrow slit of 1-2 mm is provided between the air baffle and the fin.
[0008] Preferably, the air baffle is provided with reinforcing ribs on both sides.
[0009] More preferably, the reinforcing rib extends downwards.
[0010] More preferably, the reinforcing rib extends downwards by 1.5-2.5 mm.
[0011] Preferably, the fin is provided with an ejector port and a flame port, with the flame port located at the top of the fin and higher than the air baffle.
[0012] A burner including the aforementioned auxiliary structure for reducing fin temperature.
[0013] Preferably, the burner further includes fins, a front baffle, and a rear baffle;
[0014] Multiple fins are arranged in parallel and spaced apart between the front baffle and the rear baffle, and the air baffle is installed on the front baffle and the rear baffle at both ends.
[0015] More preferably, the burner further includes flame transfer plates that can block the air at both ends of the fins.
[0016] More preferably, the front baffle and the rear baffle are provided with a plurality of flame-transmitting plates spaced apart, and the flame-transmitting plates are disposed between adjacent fins.
[0017] More preferably, the air baffle is connected to the front baffle and the rear baffle at both ends via flame transfer plates.
[0018] This invention provides a secondary air baffle structure for reducing flame combustion temperature. It is an auxiliary structure designed for ordinary atmospheric negative pressure combustion. With this auxiliary structure, the air is divided into two paths by the air baffle when passing between the fins. The air reaches the burner surface through the narrow slit. As the air is compressed and the flow rate is increased when passing through the narrow slit, the temperature that was originally radiated and conducted to the fin surface by the burner flame is carried away by the air. In this way, the fin surface is cooled and the combustion gas is indirectly cooled, thereby reducing the flame temperature and improving the emission of nitrogen oxides.
[0019] Compared with the prior art, the present invention has the following beneficial effects:
[0020] 1. The auxiliary structure of this utility model can reduce the temperature of the fin surface by increasing the airflow velocity, thereby improving the temperature rise problem of the burner fins;
[0021] 2. The auxiliary structure of this utility model can indirectly reduce the combustion gas temperature by lowering the surface temperature of the fins, thereby reducing the flame temperature, improving nitrogen oxide emissions, and better meeting environmental protection requirements;
[0022] 3. This utility model has a simple structure, is easy to install, and has low modification costs;
[0023] 4. The auxiliary structure of this utility model does not affect the utilization of secondary air, and maintains good combustion conditions while improving the cooling effect of the fins. Attached Figure Description
[0024] Figure 1 This is a schematic diagram illustrating the structure and working principle of the auxiliary structure for reducing fin temperature according to this utility model.
[0025] Figure 2 This is a partially enlarged view of the auxiliary structure for reducing fin temperature according to this utility model;
[0026] Figure 3 This is a schematic diagram of the structure of the rear baffle and the secondary air baffle of this utility model;
[0027] Figure 4 This is a schematic diagram of the structure of the secondary air baffle of this utility model;
[0028] Figure 5 This is a schematic diagram of the structure of the front baffle, secondary air baffle and flame transfer plate of this utility model;
[0029] Figure 6 This is a front view of the burner in Comparative Example 1;
[0030] Figure 7 This is a bottom view of the burner in Comparative Example 1;
[0031] In the diagram: 1-fin, 2-air baffle, 3-slit, 4-front baffle, 5-rear baffle, 6-ignition plate, 7-ordinary secondary air baffle. Detailed Implementation
[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.
[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0034] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0035] Example 1
[0036] An auxiliary structure for reducing fin temperature, such as Figure 1 As shown, it includes multiple parallel air baffles 2 arranged at intervals between adjacent fins 1 of the burner, and each air baffle 2 has a narrow slit 3 with a width of 1-2 mm between its two sides and the fin 1.
[0037] Example 2
[0038] An auxiliary structure for reducing fin temperature, such as Figure 2 As shown, the width of the narrow slit 3 refers to the horizontal distance L between the top of the air baffle 2 and the edge at the corresponding height of the fin 1. In this embodiment, the air baffle 2 has downwardly extending reinforcing ribs on both sides near the fin 1. The rest is the same as in Embodiment 1.
[0039] Example 3
[0040] A burner includes the auxiliary structure for reducing fin temperature as described in Example 2, such as... Figures 3-5 As shown, it also includes fins 1, front baffle 4, rear baffle 5, and flame transfer plate 6.
[0041] Multiple fins 1 are arranged in parallel and spaced apart between the front baffle 4 and the rear baffle 5, and multiple air baffles 2 are arranged in parallel and spaced apart between adjacent fins 1, with both ends mounted on the front baffle 4 and the rear baffle 5 via flame transfer plates 6.
[0042] This embodiment is an improvement on the ordinary atmospheric negative pressure burner. The secondary air baffle originally installed at the bottom of the burner is adjusted to serve as an air baffle 2 between adjacent fins 1.
[0043] The working principle of the burner in this embodiment is as follows: Gas combustion and primary air enter the fin 1 through the injection port, mix, and flow out through the top burner nozzle. They are then ignited by the burner's ignition system to form a uniform combustion flame. Simultaneously, secondary air enters from the bottom of the burner between adjacent fins 1. As it passes between the fins 1, it is divided into two paths by the air baffle 2 and reaches the burner surface through a narrow slit 3. Because the secondary air is compressed and its flow velocity increases as it passes through the narrow slit 3, the heat originally radiated and conducted to the surface of the fins 1 by the burner flame is carried away by the secondary air. This cools the surface of the fins 1, indirectly cooling the gas combustion, thereby reducing the flame temperature and improving nitrogen oxide emissions.
[0044] Example 4
[0045] An auxiliary structure and burner for reducing fin temperature are disclosed. The auxiliary structure includes a secondary air baffle 2 disposed between adjacent fins 1 of the burner. The size B of the secondary air baffle 2 is determined according to the spacing of the fins 1. Generally, the width of the narrow gap 3 between the fins 1 is kept at 1-2 mm. Too large or too small a gap will affect the combustion conditions and fin cooling effect.
[0046] To prevent the secondary air baffle 2 between the fins 1 from deforming due to high temperature during burner operation, this embodiment adds side reinforcing ribs with a dimension A of 1.5-2.5mm on both sides of dimension B.
[0047] To ensure the ignition speed, this embodiment includes a ignition plate 6 that blocks the air at both ends of the fin 1, preventing excessive wind speed from affecting the ignition speed.
[0048] Figure 3 The function of the rear baffle 5 is to block the air passage at the rear of the burner, so that the air is diverted to the lower part of the burner and enters the burner, increasing the air flow velocity in the narrow slit 3. At the same time, the rear baffle 5 is also a bracket for fixing the air baffle 2, which can be fixed to the rear bracket of the burner with screws.
[0049] Figure 5 The function of the front baffle 4 is to block the air passage at the front of the burner, so that the air is diverted to the lower part of the burner and enters the burner, increasing the air flow velocity through the narrow slit 3. At the same time, the front baffle 4 is also a bracket for fixing the air baffle 2, which can be fixed to the front bracket of the burner with screws.
[0050] In this embodiment, the air is divided into two paths by the air baffle 2 when passing between the fins 1, and reaches the burner surface through the narrow slit 3. As the air is compressed and its flow rate increases when passing through the narrow slit 3, the temperature that was originally radiated and conducted to the surface of the fins 1 by the burner flame is carried away by the air. In this way, the surface of the fins 1 is cooled, and the gas is also indirectly cooled, thereby reducing the flame temperature and improving the emission of nitrogen oxides.
[0051] Comparative Example 1
[0052] A type of burner, such as Figures 6-7 As shown, this is a common atmospheric negative pressure burner. Its ordinary secondary air baffle 7 is installed at the bottom of the burner. Because the air flow rate between the fins is relatively slow, the cooling efficiency of the burner fins is low, and less heat is carried away by the air. The high combustion temperature easily increases the emission of nitrogen oxides.
[0053] After using the air baffle of this invention, under the same conditions, the fin temperature can be reduced from the original 250-400℃ to below 100℃, and the nitrogen oxide emissions can be reduced to 80-90 mg / kw.h. The original structure emitted 95-120 mg / kw.h of nitrogen oxides, demonstrating that the nitrogen reduction effect of this invention is very significant.
[0054] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.
Claims
1. An auxiliary structure for reducing fin temperature, characterized in that, It includes an air baffle (2) disposed between adjacent fins (1), and a narrow slit (3) 1-2 mm wide is provided between the air baffle (2) and the fin (1).
2. The auxiliary structure for reducing fin temperature according to claim 1, characterized in that, The air baffle (2) is reinforced on both sides.
3. The auxiliary structure for reducing fin temperature according to claim 2, characterized in that, The reinforcing rib extends downwards.
4. The auxiliary structure for reducing fin temperature according to claim 3, characterized in that, The reinforcing rib extends downwards by 1.5-2.5mm.
5. The auxiliary structure for reducing fin temperature according to claim 1, characterized in that, The fin (1) is provided with an ejector port and a flame port, with the flame port located at the top of the fin (1) and higher than the air baffle (2).
6. A burner, characterized in that, Includes the auxiliary structure for reducing fin temperature as described in any one of claims 1 to 5.
7. The burner according to claim 6, characterized in that, It also includes fins (1), a front baffle (4) and a rear baffle (5); Multiple fins (1) are arranged in parallel and spaced apart between the front baffle (4) and the rear baffle (5), and the air baffle (2) is installed on the front baffle (4) and the rear baffle (5) at both ends.
8. The burner according to claim 7, characterized in that, It also includes a flame transfer plate (6) that can block the air at both ends of the fin (1).
9. The burner according to claim 8, characterized in that, Multiple flame-transmitting plates (6) are spaced apart on the front baffle (4) and the rear baffle (5), and the flame-transmitting plates (6) are arranged between adjacent fins (1).
10. The burner according to claim 8, characterized in that, The air baffle (2) is connected to the front baffle (4) and the rear baffle (5) at both ends via fire transfer plates (6).