Boiler tiny-oil burner with low NOx generation function

Abstract

The utility model discloses a boiler tiny-oil burner with a low NOx generation function, and relates to the technical field of boiler tiny-oil burners, in particular to the boiler tiny-oil burner with the low NOx generation function. Comprising a main body, a central combustion cylinder, an air box internal fixing seat, a combustion cylinder connecting oil pipe, a pulverized coal equally-distributing device, a combustion-supporting air interface, a cooling air interface, a combustor rotational flow regulator, a regulator fixing device, a combustor outer sleeve, an oil receiving inlet connecting pipe and a compressed air interface. According to the utility model, by optimizing the structure of the combustor and improving the rotational flow regulator of the combustor, the combustion efficiency is obviously improved, and the fuel waste and the generation of NOx are reduced. After transformation, the stability of equipment is enhanced, the operation cost of a denitration system is reduced, pollutant emission is reduced, and the operation efficiency and economic benefits are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler micro-oil burners, in particular to a boiler micro-oil burner with a low NOx generation function. Background Art

[0002] In 2023, the unit load was basically below 580MW and the volatile matter reached 20.2%, and the NOx generation concentration was low. Since 2024, the unit load above 600MW accounted for about 35%, and the volatile matter of the coal entering the furnace dropped significantly to 14%, and the NOx generation concentration increased. The average high-load NOx concentration reached 850mg / Nm 3 . The differential pressure of the air preheater increased successively during the same period, reflecting the high ammonia slip of the denitrification system. Combined with the influence of NOx removal exceeding the design value of the denitrification system and flue gas dust concentration exceeding the design on the denitrification system, it is speculated that the main reason for the high ammonia slip above 600MW is that the NOx removal exceeds the design value of the denitrification system. The existing micro-oil burner has the following disadvantages and needs further improvement.

[0003] 1. Traditional equipment does not adopt the advanced cyclone micro-oil pulverized coal burner design, and the structure of its pulverized coal concentration device and central combustion barrel has not been optimized. Due to the lack of an effective pulverized coal concentration device, the fuel cannot be fully pre-treated before entering the combustion chamber, resulting in uneven distribution of fuel particles and unstable combustion process. In addition, the design of the central combustion barrel part has not fully considered the improvement of combustion efficiency. The central combustion barrel of a traditional burner is often just a simple combustion channel, and the design fails to be optimized using the principles of fluid mechanics, resulting in incomplete combustion, low fuel utilization, and high NOx generation concentration. At the same time, the structural design of traditional burners is prone to problems when running at high loads, such as unstable combustion, flame swing, and fuel waste. These problems not only affect the overall operating efficiency of the boiler, but also increase the emission of pollutants, causing adverse effects on the environment. Therefore, there is an urgent need for a micro-oil burner with an optimized structure.

[0004] 2. Traditional equipment is not equipped with an effective swirl regulator, making it difficult to optimize the combustion process. The role of the swirl regulator is to optimize the combustion process by adjusting the mixing ratio of fuel and air, thereby reducing the generation concentration of NOx. Due to the lack of this key device, the mixing ratio of fuel and air in traditional burners is difficult to control, resulting in excess or insufficient air during the combustion process. Unstable combustion conditions will lead to low fuel utilization, incomplete combustion, and the generation of a large amount of NOx and other pollutants. In addition, the combustion performance of traditional burners under different load conditions is also difficult to adjust, resulting in high NOx generation concentration during high-load operation and unstable combustion during low-load operation. Without a swirl regulator, it is difficult for the burner to adjust according to the real-time operating conditions in actual operation, and the optimal combustion state cannot be achieved. This not only affects the operating efficiency and economy of the boiler, but also increases the risk of environmental pollution. Therefore, there is an urgent need for a micro-oil burner with a swirl regulator. Utility Model Content

[0005] The main purpose of the utility model is to provide a boiler low-oil burner with a low NOx generation function, which can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: there is a boiler low-oil burner with a low NOx generation function, a central combustion barrel is installed below the main body, an internal fixing seat of the bellows is installed below the central combustion barrel, a combustion barrel connecting oil pipe is installed above the main body, a coal powder equalizer is installed above the main body, a combustion-supporting air interface is installed above the combustion barrel connecting oil pipe, a cooling air interface is installed above the combustion barrel connecting oil pipe, a burner swirl regulator is installed above the combustion barrel connecting oil pipe, a regulator fixing device is installed above the combustion barrel connecting oil pipe, and a burner outer sleeve is installed on one side of the main body.

[0007] Preferably, an oil inlet pipe is installed above the combustion tube connecting oil pipe, and a compressed air interface is installed above the combustion tube connecting oil pipe.

[0008] Preferably, the exterior of the main body adopts a rounded corner design.

[0009] Preferably, the oil inlet pipe and the compressed air interface have apertures of Φ22 and are symmetrically designed.

[0010] Preferably, the combustion-supporting air interface needs to be connected to a DN80 metal hose and combustion-supporting air.

[0011] Preferably, the cooling air interface aperture is Φ34.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The utility model can effectively solve the problems of unoptimized structure and low combustion efficiency of traditional burners. As the core structure of the equipment, the main body provides a stable platform to ensure that all components can be firmly installed and operate normally. The central combustion barrel is well designed to ensure that the fuel can burn under optimal conditions, improve combustion efficiency and reduce fuel waste. The internal fixing seat of the bellows ensures the stable installation of the combustion barrel, reduces vibration and noise during operation, and further improves the stability of combustion. The combustion barrel is connected to the oil pipe to ensure the smooth transportation of fuel and avoid loss and waste of fuel during transportation. The coal powder divider is responsible for evenly distributing the coal powder into the combustion barrel to ensure that the coal powder can be fully burned, further improve the combustion efficiency and reduce the generation of NOx. Through these structural optimizations, the burner not only improves the combustion efficiency, but also significantly reduces the emission of pollutants, achieving high efficiency and environmental protection effects.

[0014] 2. In the utility model, the addition of a burner swirl regulator and a regulator fixing device solves the problem that the combustion process of the traditional burner is difficult to optimize. The burner swirl regulator optimizes the combustion process by accurately adjusting the mixing ratio of air and fuel, ensuring that the temperature and oxygen content in the combustion process are in the best state, thereby significantly reducing the concentration of NOx generated. The regulator fixing device ensures that the swirl regulator can be firmly installed to ensure that it can still work normally when running at high load. In addition, the combustion air interface and the cooling air interface further optimize the combustion process by providing combustion air and cooling air, avoiding damage to the equipment caused by excessive temperature. The burner outer sleeve not only protects the internal key components, but also provides a good thermal insulation effect, extending the service life of the equipment. The oil inlet pipe and the compressed air interface further optimize the combustion process by accurately controlling the input amount of fuel and air, improving the combustion efficiency and reducing the emission of pollutants. Through the synergistic effect of these components, the burner can maintain a stable and efficient combustion state when running at high load, solving the problems of unstable combustion and high pollutant emissions of traditional burners when running at high load. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the overall structure of the utility model;

[0016] Figure 2 It is a side view of the overall structure of the utility model;

[0017] Figure 3 It is the top view of the overall structure of the utility model.

[0018] In the figure: 1. Main body; 2. Central combustion cylinder; 3. Internal fixing seat of bellows; 4. Combustion cylinder connecting oil pipe; 5. Coal powder divider; 6. Combustion air interface; 7. Cooling air interface; 8. Burner swirl regulator; 9. Regulator fixing device; 10. Burner outer sleeve; 11. Oil inlet pipe; 12. Compressed air interface. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example

[0023] See also Figure 1-3 , the utility model provides a technical solution:

[0024] A boiler micro-oil burner with a low NOx generation function, wherein a central combustion tube 2 is installed below the main body 1, a bellows internal fixing seat 3 is installed below the central combustion tube 2, a combustion tube connecting oil pipe 4 is installed above the main body 1, a coal powder equalizer 5 is installed above the main body 1, a combustion-supporting air interface 6 is installed above the combustion tube connecting oil pipe 4, a cooling air interface 7 is installed above the combustion tube connecting oil pipe 4, a burner swirl regulator 8 is installed above the combustion tube connecting oil pipe 4, a regulator fixing device 9 is installed above the combustion tube connecting oil pipe 4, and a burner outer sleeve 10 is installed on one side of the main body 1.

[0025] The following is a specific implementation of the utility model components:

[0026] 1. Subject:

[0027] The main body is the core structure of the boiler micro-oil burner, which is responsible for supporting and connecting all other components. It provides a stable platform to ensure that all components can be installed and operate stably. There are multiple connection points and support structures in the main body for installing key components such as the central combustion cylinder, the internal fixing seat of the wind box, and the combustion cylinder connecting oil pipe.

[0028] 2. Center combustion tube:

[0029] The central combustion barrel is installed below the main body and is mainly used for the combustion process of the fuel. The fuel enters the combustion chamber through the combustion barrel and burns fully at high temperature. The design of the central combustion barrel ensures that the fuel can be evenly distributed and burned fully, improves combustion efficiency, and reduces the generation of pollutants.

[0030] 3. Bellows internal fixing seat:

[0031] The bellows internal fixing base is installed under the central combustion cylinder to fix and support the bellows. It provides stable support so that the bellows can withstand the heat and pressure generated during the combustion process, while ensuring the stability and uniform distribution of the airflow inside the bellows.

[0032] 4. Burner tube connecting oil pipe:

[0033] The combustion barrel connecting oil pipe is installed above the main body and is used to transport the fuel into the combustion barrel. The oil pipe ensures that the fuel can enter the combustion chamber smoothly and burn at high temperature to provide the required heat energy. The design of the connecting oil pipe ensures the stable delivery and combustion efficiency of the fuel.

[0034] 5. Pulverized coal divider:

[0035] The pulverized coal distributor is installed above the main body and is responsible for evenly distributing the pulverized coal into the combustion tube. Through a precise distribution mechanism, the device ensures that the pulverized coal can evenly enter the combustion chamber, fully mix with the air and burn, thereby improving combustion efficiency and stability.

[0036] 6. Combustion air interface:

[0037] The combustion air interface is installed above the oil pipe connecting the combustion cylinder to introduce combustion air. The combustion air enters the combustion chamber through the interface, mixes with the fuel, provides the oxygen required for combustion, ensures that the fuel can be fully burned, and reduces pollutants produced by incomplete combustion.

[0038] 7. Cooling air interface:

[0039] The cooling air interface is installed above the burner connecting oil pipe to introduce cooling air. The cooling air enters the burner through the interface, reducing the high temperature during the combustion process, protecting the internal components of the burner and extending the service life of the equipment.

[0040] 8. Burner swirl regulator:

[0041] The burner swirl regulator is installed above the oil pipe connecting the combustion barrel. It optimizes the combustion process by adjusting the mixing ratio of air and fuel. The regulator ensures that the fuel and air form a stable swirl in the combustion chamber, improves combustion efficiency, and reduces the concentration of NOx.

[0042] 9. Regulator fixing device:

[0043] The regulator fixing device is installed above the combustion barrel connecting oil pipe to fix the burner swirl regulator. This device ensures that the regulator can be firmly installed during high-load operation to avoid vibration and displacement, ensuring the stability and efficiency of the combustion process.

[0044] 10. Burner outer sleeve:

[0045] The burner outer sleeve is installed on the outside of the burner to protect the key internal components and provide insulation and protection. The outer sleeve is reasonably designed to withstand high temperature environments, extend the service life of the equipment, and ensure the safe and stable operation of the burner.

[0046] 11. Oil inlet pipe:

[0047] The oil inlet pipe is installed above the combustion tube connecting oil pipe and is used to connect the fuel delivery system. The pipe ensures that the fuel can smoothly enter the combustion tube and fully burn in the combustion chamber to provide the required heat energy.

[0048] 12. Compressed air interface:

[0049] The compressed air interface is installed above the combustion tube connecting the oil pipe and is used to introduce compressed air. The compressed air enters the combustion chamber through the interface, increasing the oxygen content in the air, promoting the full combustion of the fuel, improving the combustion efficiency and reducing the generation of pollutants.

[0050] The following is the specific technical logic implementation method of the innovative point of this utility model:

[0051] 1. Solve the problem of unoptimized structure and low combustion efficiency

[0052] Traditional burners have the problem of unoptimized structure, which leads to low combustion efficiency, fuel waste and large pollutant emissions. The utility model solves these problems through the following technical means:

[0053] 1.1 Main body: As the core structure, the main body provides a stable platform, allowing each component to be accurately installed and aligned, thus ensuring the stable operation of the entire system. The design of the main body takes into account the connection and support requirements of each component to ensure structural stability under high temperature and high pressure environments.

[0054] 1.2 Center combustion barrel: The center combustion barrel adopts a sophisticated design, so that the fuel can be evenly distributed after entering the combustion chamber and burn under optimal conditions. By optimizing the internal flow channel and combustion area of ​​the combustion barrel, it ensures that the fuel and air are fully mixed, improves the combustion efficiency, and reduces the emission of unburned fuel.

[0055] 1.3 Bellows internal fixing seat: The bellows internal fixing seat provides stable support to ensure that the central combustion cylinder and other components will not loosen or shift due to vibration during operation. The fixing seat is designed with thermal expansion and mechanical stress in mind, reducing vibration and noise and enhancing combustion stability.

[0056] 1.4 Combustion barrel connecting oil pipe: The combustion barrel connecting oil pipe is precisely designed to ensure that the fuel can be smoothly transported into the combustion chamber. By optimizing the diameter and flow channel design of the oil pipe, the fluid resistance and fuel loss during the transportation process are reduced, ensuring that the fuel can enter the combustion chamber at a stable flow rate.

[0057] 1.5 Coal powder distributor: The coal powder distributor evenly distributes the coal powder into the combustion tube through a precise distribution mechanism. The design of the distributor takes into account the air flow dynamics to ensure that the coal powder can be fully dispersed before entering the combustion chamber and form a uniform combustion mixture after mixing with the air, thereby improving combustion efficiency and reducing the generation of NOx.

[0058] 2. Solve the problem of difficult optimization of combustion process

[0059] The traditional burner has poor control over the mixing ratio and temperature during the combustion process, resulting in unstable combustion and high pollution. The utility model optimizes the combustion process through the following technical means:

[0060] 2.1 Burner swirl regulator: The burner swirl regulator optimizes the combustion process by adjusting the mixing ratio of air and fuel. The design of the regulator allows the air and fuel to form a swirl before entering the combustion chamber to improve the mixing uniformity. By adjusting the swirl intensity, the temperature distribution and oxygen content in the combustion chamber can be controlled to ensure that the combustion process is in the best state, thereby significantly reducing the concentration of NOx generated.

[0061] 2.2 Regulator Fixing Device: The regulator fixing device ensures that the burner swirl regulator can be firmly installed during high-load operation to avoid vibration and displacement. The design of the fixing device takes into account the mechanical stability under high temperature and high pressure environments, ensuring that the regulator can work normally under various working conditions and provide stable swirl control.

[0062] 2.3 Combustion-supporting air interface and cooling air interface: The combustion-supporting air interface introduces combustion-supporting air to increase the oxygen content in the combustion process and ensure full combustion of the fuel. The cooling air interface introduces cooling air to adjust the temperature in the combustion chamber to prevent excessive temperature from damaging the equipment. Precise control of the combustion-supporting air and cooling air further optimizes the combustion process and ensures combustion stability and efficiency.

[0063] 2.4 Burner outer sleeve: The burner outer sleeve protects the key internal components and prevents high temperature from damaging the equipment. The heat insulation design of the outer sleeve effectively reduces heat loss, extends the service life of the equipment, and ensures that the burner can operate stably under various working conditions.

[0064] 2.5 Oil inlet pipe and compressed air interface: The oil inlet pipe and compressed air interface ensure that the fuel and air mixture ratio is always in the best state by accurately controlling the input amount of fuel and compressed air. The interface design takes into account the fluid dynamics and thermodynamics characteristics to ensure that the fuel and air can enter the combustion chamber stably and evenly, improve combustion efficiency and reduce the generation of pollutants.

[0065] The following is a description of the construction scheme of this utility model:

[0066] 1. Completely isolate the external pipelines such as the oil pipe, compressed air pipe, combustion-supporting air pipe, etc. connecting the central combustion cylinder of the cyclone micro-oil pulverized coal burner.

[0067] 2. Remove the oil pipes, compressed air pipes, combustion-supporting air pipes and other external pipelines and measuring points connected to the central combustion tube of the cyclone micro-oil pulverized coal burner.

[0068] 3. Pull out the micro-oil gun and ignition gun from the central combustion tube of the cyclone micro-oil pulverized coal burner.

[0069] 4. Cut off the oil gun combustion tube fixing device at the coal powder inlet pipe and inner tube of the cyclone micro-oil coal powder burner, and pull the oil gun combustion tube out of the burner.

[0070] 5. Install the burner swirl regulator pull rod fixing device at the coal inlet pipe of the cyclone micro-oil coal powder burner, and ensure that the holes are coaxial during installation.

[0071] 6. Install the burner swirl regulator on the cyclone micro-oil pulverized coal burner, and make two burner swirl regulator fixing devices on the outer tube of the burner.

[0072] 7. Adjust the burner swirl regulator position.

[0073] 8. Check and replace the deformed and damaged outer sleeve of the micro-oil burner.

[0074] The following are the material configuration parameters of this utility model (amount for one boiler):

[0075]

[0076] The following are the effects of the implementation of this utility model:

[0077] After the transformation, the NOx generation concentration is reduced, the denitrification system does not exceed the design value, the equipment stability is improved, and the ammonia escape is reduced. After the transformation, the unit's high-load capacity is improved, which is beneficial for the unit to strive for high peak subsidies: reducing ammonia escape, reducing the blockage of air preheater heat storage elements, and facilitating differential pressure control; improving the quality of by-products.

[0078] After the transformation, the NOx generation concentration was reduced, the amount of ammonia sprayed in the denitrification system was reduced, and the urea unit consumption was reduced. Based on the annual power generation of 3.2 billion kWh / year, the urea unit price is 2,800 yuan / ton, the NOx generation concentration dropped by 50mg, the urea unit consumption dropped by about 12 tons / 100 million kWh, and the urea cost was saved by about 1.075 million yuan / year.

[0079] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A boiler low-oil burner with low NOx generation function, comprising a main body (1), characterized in that: A central combustion tube (2) is installed below the main body (1), an internal fixing seat (3) of a wind box is installed below the central combustion tube (2), a combustion tube connecting oil pipe (4) is installed above the main body (1), a coal powder equalizer (5) is installed above the main body (1), a combustion air interface (6) is installed above the combustion tube connecting oil pipe (4), a cooling air interface (7) is installed above the combustion tube connecting oil pipe (4), a burner swirl regulator (8) is installed above the combustion tube connecting oil pipe (4), a regulator fixing device (9) is installed above the combustion tube connecting oil pipe (4), and a burner outer sleeve (10) is installed on one side of the main body (1).

2. A boiler low-oil burner with low NOx generation function according to claim 1, characterized in that: An oil inlet pipe (11) is installed above the combustion tube connecting oil pipe (4), and a compressed air interface (12) is installed above the combustion tube connecting oil pipe (4).

3. A boiler low-oil burner with low NOx generation function according to claim 1, characterized in that: The exterior of the main body (1) is designed with rounded corners.

4. A boiler low-oil burner with low NOx generation function according to claim 2, characterized in that: The oil inlet pipe (11) and the compressed air interface (12) both have a hole diameter of Φ22 and are symmetrically designed.

5. The boiler low-oil burner with low NOx generation function according to claim 1 is characterized in that: The combustion-supporting air interface (6) needs to be connected to a DN80 metal hose and combustion-supporting air.

6. A boiler low-oil burner with low NOx generation function according to claim 1, characterized in that: The aperture of the cooling air interface (7) is Φ34.

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