Circulating combustion auxiliary device of low-nitrogen combustion machine

Abstract

The circulating combustion auxiliary device of the low-nitrogen combustion engine comprises a combustor, the combustor comprises a gas inlet set, a gas mixing cavity, a combustion chamber and a smoke exhaust pipe, the gas output end of the gas inlet set is connected with the gas inlet end of the gas mixing cavity, the output end of the gas mixing cavity is connected with the combustion chamber, and the smoke exhaust pipe is connected with the combustion chamber. The flue gas discharge pipe is located on one side of the combustion chamber, a guide pipe is arranged on the other side of the gas inlet set, the guide pipe is connected with a flue gas guide pipe arranged on the outer side of the flue gas discharge pipe, and a one-way valve is arranged at the joint of the guide pipe and the gas inlet set. According to the invention, the operation cost is reduced, the safety of the system is enhanced, the service life of equipment is prolonged, and by adopting a flue gas recirculation (FGR) system and a catalytic reduction technology, the generation and emission of nitrogen oxides (NOx) in the combustion process are greatly reduced, and the ecological environment is protected.

Description

Technical Field

[0001] The present application relates to the field of combustion technology, and specifically to a circulating combustion auxiliary device for a low-nitrogen burner. Background Art

[0002] With the increasing global awareness of environmental protection, especially the strict restrictions on atmospheric pollutant emissions, reducing NOx generated during the combustion process has become an important challenge for industrial combustion equipment. NOx is one of the main atmospheric pollutants. It not only causes the formation of acid rain but also exacerbates the greenhouse effect and affects human health. Therefore, governments and environmental protection organizations around the world have formulated strict emission standards, requiring industrial combustion equipment to take measures to reduce NOx emissions.

[0003] In the combustion process of traditional combustion equipment, especially under high-temperature conditions, a large amount of NOx is easily generated; because during combustion, nitrogen and oxygen in the air react at high temperatures to form NOx. In addition, incomplete combustion will also lead to the residue of hydrocarbons, increasing the energy consumption and emissions of the combustion system. Summary of the Invention

[0004] The technical problem to be solved by the present application is to overcome the existing defects and provide a circulating combustion auxiliary device for a low-nitrogen burner, which can effectively solve the problems in the background art.

[0005] To achieve the above object, the present application provides the following technical solution: A circulating combustion auxiliary device for a low-nitrogen burner, including a burner, the burner includes an air intake group, a gas mixing chamber, a combustion chamber and a flue gas discharge pipe, the gas output end of the air intake group is connected to the air intake end of the gas mixing chamber, the output end of the gas mixing chamber is connected to the combustion chamber, the flue gas discharge pipe is located on one side of the combustion chamber, a guide pipe is arranged on the other side of the air intake group, the guide pipe is connected to a flue gas conduit arranged outside the flue gas discharge pipe, a one-way valve is arranged at the connection between the guide pipe and the air intake group, and a negative pressure component for promoting secondary combustion of the flue gas is arranged on the guide pipe.

[0006] As a preferred technical solution of the present application, high-temperature resistant sealing rings are arranged at the connections of the air intake group, the gas mixing chamber, the combustion chamber, the flue gas discharge pipe and the guide pipe.

[0007] As a preferred technical solution of the present application, the inner wall of the gas mixing chamber is provided with spirally arranged guide plates.

[0008] As a preferred technical solution of the present application, a filtering group is arranged at the end of the air intake group.

[0009] As a preferred technical solution of the present application, a catalytic group for reducing nitrogen oxidation is arranged in the flue gas discharge pipe.

[0010] Compared with the prior art: The present application can significantly reduce NOx emissions during the combustion process, improve combustion efficiency, reduce operating costs, enhance system safety, and extend equipment life. By adopting a flue gas recirculation (FGR) system and catalytic reduction technology, the generation and emission of nitrogen oxides (NOx) during the combustion process are greatly reduced, protecting the ecological environment. The spiral deflector promotes the full mixing of fuel and air, improves the uniformity and completeness of combustion, reduces unburned hydrocarbons, improves combustion efficiency, and saves energy consumption. The setting of the one-way valve and high-temperature resistant sealing ring ensures the sealing and safety of the combustion system, prevents gas leakage, reduces the risk of fire and explosion, and protects the safety of operators and the surrounding environment. The filter group at the end of the intake group effectively removes impurities in the air, reduces wear of internal parts, extends the service life of the combustion system, and reduces the need for frequent maintenance. Brief Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of the present application;

[0012] Figure 2 is a front view of the present application;

[0013] Figure 3 is Figure 2 a schematic structural diagram of the A-A cross-section in

[0014] In the figure: 1 burner, 2 intake group, 3 gas mixing chamber, 4 combustion chamber, 5 flue gas discharge pipe, 6 guide pipe, 7 flue gas conduit, 8 one-way valve, 9 negative pressure component, 10 high-temperature resistant sealing ring, 11 spiral deflector, 12 filter group, 13 catalytic group. Detailed Description of the Embodiment

[0015] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application (for the convenience of description and understanding, the above is described with the upper side as the upper side). All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. Figure 2 above as the upper side for description).

[0016] Please refer to Figures 1-3 , the present application provides a technical solution: a circulating combustion auxiliary device for a low-nitrogen burner, including a burner 1, the burner 1 includes an intake group 2, a gas mixing chamber 3, a combustion chamber 4, and a flue gas discharge pipe 5. The gas output end of the intake group 2 is connected to the intake end of the gas mixing chamber 3. The output end of the gas mixing chamber 3 is connected to a combustion chamber 4. The flue gas discharge pipe 5 is located on one side of the combustion chamber 4.

[0017] The intake group 2 is responsible for inhaling external air and guiding it to the gas mixing chamber 3, which is a key area for the mixing of air and fuel. The fuel and air are precisely proportioned to ensure complete combustion of the fuel, reducing harmful emissions. By optimizing the mixing process, more efficient combustion and lower NOx generation can be achieved.

[0018] The flue gas discharge pipe 5 is responsible for leading the waste gas (flue gas) generated by combustion out of the combustion system. These flue gases usually contain pollutants such as unburned substances and nitrogen oxides.

[0019] Fresh air is first inhaled through the intake group 2 and then mixed with fuel in the gas mixing chamber 3. The mixed fuel-air mixture enters the combustion chamber 4, where it is ignited and burned. The flue gas generated by combustion is discharged through the flue gas discharge pipe 5.

[0020] On the other side of the intake group 2, a guiding pipe 6 is provided. The guiding pipe 6 is connected to a flue gas conduit 7 arranged outside the flue gas discharge pipe 5. A one-way valve 8 is provided at the connection between the guiding pipe 6 and the intake group 2, and a negative pressure component 9 for promoting the secondary combustion of flue gas is provided on the guiding pipe 6.

[0021] The intake group 2, the guiding pipe 6, the flue gas conduit 7, the one-way valve 8, and the negative pressure component 9 together constitute a flue gas recirculation (FGR) system, which further reduces the generation amount of nitrogen oxides (NOx) during the combustion process.

[0022] The guiding pipe 6 reintroduces a part of the flue gas discharged from the combustion chamber 4 into the intake group 2 to achieve flue gas recirculation. The recirculated flue gas has a lower oxygen concentration and a higher temperature, which helps to reduce the peak temperature in the combustion chamber 4, thereby reducing the formation of NOx.

[0023] The flue gas conduit 7 is located outside the flue gas discharge pipe 5, extracts part of the flue gas from the flue gas discharge pipe 5, and guides it to the guiding pipe 6 to participate in the recirculation process.

[0024] The one-way valve 8 is installed at the connection between the guiding pipe 6 and the intake group 2 to ensure that the flue gas can only flow in one direction, that is, from the flue gas discharge pipe 5 back to the intake group 2 through the guiding pipe 6, and cannot flow in the reverse direction. It can prevent fresh air from accidentally flowing into the flue gas discharge system and maintain the normal operation and safety of the system.

[0025] The negative pressure component 9 is used to generate negative pressure in the guiding pipe 6 to help the flue gas be smoothly sucked from the flue gas conduit 7 into the intake group 2. The generation of negative pressure can be achieved by mechanical means (such as a fan) or thermodynamic effects (utilizing the natural flow characteristics of the flue gas).

[0026] When the burner 1 is operating, the combustion chamber 4 generates high-temperature flue gas. A part of the flue gas is extracted through the flue gas duct 7 and, with the help of the negative pressure component 9, is re-introduced into the intake group 2 through the guiding pipe 6. Since this part of the flue gas contains less oxygen and is at a higher temperature, it dilutes the fresh air entering the combustion chamber 4, reduces the combustion temperature, and thus inhibits the generation of NOx. At the same time, the one-way valve 8 ensures the safety of the system and prevents problems caused by reverse flow.

[0027] Furthermore, high-temperature resistant sealing rings 10 are provided at the joints of the intake group 2, the gas mixing chamber 3, the combustion chamber 4, the flue gas discharge pipe 5, and the guiding pipe 6.

[0028] The high-temperature resistant sealing rings 10 prevent the leakage of gas or flue gas at the joints, maintain the closure of the system, and avoid energy loss and environmental pollution.

[0029] Due to the extreme temperature conditions in the combustion chamber 4 and the flue gas passage, the high-temperature resistant sealing rings 10 must possess excellent heat resistance to prevent the material from softening, melting, or deforming. Good sealing reduces safety hazards caused by leakage, such as the risk of fire or explosion.

[0030] Furthermore, the inner wall of the gas mixing chamber 3 is provided with a spiral deflector 11.

[0031] The spiral deflector 11 can guide the air flow to move in a spiral form, increasing the degree of gas turbulence. Turbulence helps the fuel particles to come into more sufficient contact with oxygen, accelerates the evaporation and decomposition of the fuel, and thus promotes faster and more uniform combustion.

[0032] By forcing the gas to flow along a spiral path, the deflector 11 increases the time and space for gas mixing, enabling the fuel and air to reach the optimal mixing state before entering the combustion chamber 4. This helps to improve the sufficiency and completeness of combustion.

[0033] The spiral deflector 11 can also control the speed of the combustion process. Appropriate turbulence intensity and mixing rate can regulate the combustion rate, avoid local high-temperature problems caused by too fast combustion, and thus reduce the generation of nitrogen oxides (NOx).

[0034] More sufficient mixing and more uniform combustion mean that the hydrocarbons in the fuel can be more thoroughly converted into carbon dioxide and water, reducing the unburned residues and improving the combustion efficiency and environmental performance.

[0035] Furthermore, a filter group 12 is provided at the end of the intake group 2.

[0036] The filter group 12 removes impurities such as dust, sand grains, and other fine particles from the air entering the combustion chamber 4 or the engine. If the impurities enter the system untreated, they may wear the internal parts of the engine and reduce its performance and lifespan.

[0037] Clean air is crucial for ensuring the efficient operation of the engine or combustion system. The filter group 12 protects the entire system from corrosion and wear by blocking contaminants and preventing them from causing damage inside the system.

[0038] The filter group 12 is replaceable or washable so that maintenance or replacement can be carried out when the filtering effect deteriorates, maintaining the continuous efficient operation of the system.

[0039] Furthermore, a catalytic group 13 for reducing nitrogen oxidation is provided inside the flue gas discharge pipe 5.

[0040] In the SCR system, the catalyst is usually a honeycomb structure coated with precious metals or metal oxides. When the flue gas flows through the catalyst, ammonia (NH3) is injected into the flue gas as a reducing agent. On the surface of the catalyst, ammonia undergoes a chemical reaction with NOx, converting NOx into harmless nitrogen (N2) and water (H2O).

[0041] The catalytic group 13 provides a suitable reaction site for the NOx in the flue gas to react with the reducing agent or other components in the flue gas, thereby reducing the NOx content in the final emissions.

[0042] During use: Fresh air is purified by the filter group 12 of the intake group 2 to remove possible dust and impurities, ensuring the cleanliness and efficiency of the subsequent combustion process. The filtered air enters the gas mixing chamber 3 and mixes with the fuel. The spiral guide plate 11 causes the air flow to move in a spiral form, increasing the degree of turbulence and promoting the full mixing of fuel and air. The mixed gas enters the combustion chamber 4 and starts to burn after ignition. The flue gas generated by combustion is discharged through the flue gas discharge pipe 5. A part of the flue gas will be recycled. A part of the flue gas generated in the combustion chamber 4 is extracted through the flue gas conduit 7, and is sent back to the intake group 2 via the guide pipe 6 and the one-way valve 8 to mix with the fresh air; this process reduces the oxygen concentration entering the combustion chamber 4, slows down the combustion speed, thereby reducing the combustion temperature, maintaining the optimal combustion state and emission standards, reducing NOx generation. The catalytic group 13 inside the flue gas discharge pipe 5 further processes the remaining NOx. In the SCR system, ammonia reacts with NOx on the surface of the catalyst to be converted into N2 and H2O, significantly reducing the NOx content in the final emissions.

[0043] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A circulating combustion auxiliary device for a low-nitrogen burner, comprising a burner (1), the burner (1) comprising an air intake group (2), a gas mixing chamber (3), a combustion chamber (4) and a smoke exhaust pipe (5), the gas output end of the air intake group (2) is connected to the air intake end of the gas mixing chamber (3), the output end of the gas mixing chamber (3) is connected to the combustion chamber (4), the smoke exhaust pipe (5) is located on one side of the combustion chamber (4), and is characterized in that: A guide tube (6) is provided on the other side of the gas mixing chamber (3), and the guide tube (6) is connected to a smoke duct (7) provided on the outside of the smoke exhaust pipe (5). A one-way valve (8) is provided at the connection between the guide tube (6) and the air intake group (2), and a negative pressure component (9) for promoting secondary combustion of smoke is provided on the guide tube (6).

2. The circulating combustion auxiliary device of a low-nitrogen burner according to claim 1, characterized in that: High temperature resistant sealing rings (10) are provided at the connection points of the air intake group (2), the gas mixing chamber (3), the combustion chamber (4), the smoke exhaust pipe (5) and the guide pipe (6).

3. The circulating combustion auxiliary device of a low-nitrogen burner according to claim 1, characterized in that: The inner wall of the gas mixing chamber (3) is arranged on a spirally arranged flow guide plate (11).

4. The circulating combustion auxiliary device of a low-nitrogen burner according to claim 1, characterized in that: A filter group (12) is provided at the end of the air intake group (2).

5. The circulating combustion auxiliary device of a low-nitrogen burner according to claim 1, characterized in that: A catalytic group (13) for reducing nitrogen oxidation is arranged in the flue gas exhaust pipe (5).

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