Ultrahigh-temperature low-nitrogen heat accumulating type burner
By designing an ultra-high temperature, low-NOx regenerative burner and employing premixing and external mixing methods, the problems of low-temperature deflaming and high-temperature NOx emissions were solved, achieving efficient and low-pollution combustion.
Patent Information
- Application Number
- CN202422873079.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Conventional high-calorific-value gas single regenerative burners are prone to flameout at low temperatures, leading to gas waste, while premixed combustion produces high concentrations of NOx pollution due to excessively high temperatures.
A high-temperature, low-NOx regenerative burner is designed, employing premixing and external mixing. At low temperatures, premixed coal gas is mixed with hot air for pyrolysis and combustion, while at high temperatures, external mixing combustion is used to reduce the combustion flame temperature and NOx emissions.
At low temperatures, it ensures complete combustion and avoids flameout; at high temperatures, it reduces NOx emissions, achieving efficient combustion and reducing pollution.
Smart Images
Figure CN223649303U_ABST
Abstract
Description
Technical fields:
[0001] This utility model belongs to the field of heating furnace technology, and specifically relates to an ultra-high temperature, low-nitrogen regenerative burner. Background technology:
[0002] High-calorific-value gases such as natural gas need to be cracked before combustion. However, in conventional high-calorific-value gases, the air storage box and gas nozzle of a single regenerative burner are completely separated, which can easily cause flameout. At low temperatures, complete combustion cannot be achieved, resulting in gas waste.
[0003] If the gas is premixed to ensure complete combustion, although the gas can burn fully, the theoretical combustion temperature will rise to over 2000℃, producing a higher concentration of NO. x It pollutes the air.
[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content:
[0005] The purpose of this invention is to provide an ultra-high temperature, low-nitrogen regenerative burner that premixes at low temperatures and externally mixes at high temperatures, thereby overcoming the defects in the prior art.
[0006] To achieve the above objectives, this utility model provides an ultra-high temperature, low-NOx regenerative burner, comprising a shell, a heat storage body, a connecting cover, an air inlet, and a gas pipeline; the shell is provided with an ignition burner mounting hole, and an air pipeline is provided inside the shell; the inner cavity of the shell is divided into a heat storage chamber and a premixing chamber, the air pipeline passes through the heat storage chamber and the premixing chamber, and the air pipeline forms an outlet at the end of the premixing chamber; the gas pipeline is connected to the premixing chamber; a heat storage body is provided inside the heat storage chamber, and the heat storage body is fitted onto the air pipeline; the heat storage chamber is connected to the connecting cover, and an air inlet is provided on the connecting cover; the air inlet, the connecting cover, the air pipeline, and the air outlet form an air intake pipeline, which serves as a high-temperature flue gas exhaust pipeline when discharging flue gas in the reverse direction; the gas pipeline includes a premixed gas pipeline and an externally mixed gas pipeline; the premixed gas pipeline is connected to the air pipeline inside the premixing chamber, and the externally mixed gas pipeline extends outside the premixing chamber, with the externally mixed gas pipeline facing the outlet.
[0007] Preferably, in the technical solution, the gas pipeline includes a premixed gas pipeline, an externally mixed gas pipeline, a main gas pipeline, a premixed regulating valve, and an externally mixed regulating valve. The main gas pipeline is equipped with a premixed regulating valve and an externally mixed regulating valve. The main gas pipeline is connected to the premixed gas pipeline through the premixed regulating valve, and the main gas pipeline is connected to the externally mixed gas pipeline through the externally mixed regulating valve.
[0008] Preferably, in the technical solution, the flow rate of the premixed gas pipeline accounts for 0-30% of the total gas volume, and the flow rate of the externally mixed gas pipeline accounts for 0-100% of the total gas volume.
[0009] Preferably, in the technical solution, the heat storage body stores heat in the high-temperature flue gas emission pipeline and releases heat in the air intake pipeline.
[0010] Preferably, in the technical solution, a guide vane is provided inside the connecting cover to guide the air and flue gas and prevent them from deflecting.
[0011] Preferably, in the technical solution, the air duct at the air outlet has a reduced diameter structure to increase the outlet velocity of hot air and reduce the flow velocity of the return flue gas.
[0012] Preferably, in the technical solution, a wind deflector is provided in the heat storage chamber, and the wind deflector is located in front of the heat storage body to reduce the impact of the backflow flue gas on the heat storage body.
[0013] Compared with the prior art, the present invention has the following beneficial effects:
[0014] At low flow rates or low temperatures, hot air is premixed with the premixed gas in the pipeline. The high temperature of the hot air first cracks the gas before combustion, ensuring no flameout and complete combustion. When the premixing chamber is at high temperatures, hot air is externally mixed with gas outside the nozzle for combustion. This reduces the flame temperature and thus lowers the NO content in the flue gas. x The purpose of emissions. Attached image description:
[0015] Figure 1 This is a front view of the ultra-high temperature, low-nitrogen regenerative burner of this utility model;
[0016] Figure 2 This is a top view of the ultra-high temperature, low-nitrogen regenerative burner of this utility model. Detailed implementation method:
[0017] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.
[0018] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.
[0019] like Figure 1-2As shown, an ultra-high temperature, low-NOx regenerative burner includes a shell 1, a heat storage body 2, a connecting cover 3, an air inlet 4, and a gas pipeline. The shell 1 has an ignition burner mounting hole 5, into which a flame detector and an ignition burner are inserted. The ignition burner is responsible for ignition. The flame detector monitors the flame at low temperatures and stops detecting and exits at high temperatures. An air pipeline 6 is installed inside the shell 1. The inner cavity of the shell 1 is divided into a heat storage chamber 7 and a premixing chamber 8. The air pipeline 6 passes through the heat storage chamber 7 and the premixing chamber 8, forming an air outlet 9 at the end of the premixing chamber 8. The gas pipeline connects to the premixing chamber 8. A heat storage body 2 is installed inside the heat storage chamber 7, fitted onto the air pipeline 6. The heat storage body 2 stores heat in the high-temperature flue gas exhaust pipeline and releases heat in the air intake pipeline. A windbreak is installed inside the heat storage chamber 7, located in front of the heat storage body 2, to reduce the impact of backflow flue gas on the heat storage body 2. The heat storage chamber 7 is connected to the connecting cover 3. The connecting cover 3 is equipped with an air inlet 4 and a guide plate 15 is installed inside the connecting cover 3 to guide the air and flue gas and prevent deflection. The air inlet 4, the connecting cover 3, the air pipe 6, and the air outlet 9 form an air intake pipe, which serves as a high-temperature flue gas discharge pipe when flue gas is discharged in reverse. The gas pipeline includes a premixed gas pipeline 10, an externally mixed gas pipeline 11, a main gas pipe 12, and a premixed regulating valve 1. 3. External mixing regulating valve 14: A premixing regulating valve 13 and an external mixing regulating valve 14 are installed on the main gas pipe 12. The main gas pipe 12 is connected to the premixed gas pipeline 10 via the premixing regulating valve 13, and to the external mixing gas pipeline 11 via the external mixing regulating valve 14. The premixed gas pipeline 10 is connected to the air pipeline 6 inside the premixing chamber 8. The external mixing gas pipeline 11 extends outside the premixing chamber 8, facing the gas outlet 9. The flow rate of the premixed gas pipeline 10 accounts for 0-30% of the total gas volume, and the flow rate of the external mixing gas pipeline 11 accounts for 0-100% of the total gas volume. The air pipeline 6 at the gas outlet 9 has a narrow diameter structure to increase the outlet velocity of the hot air and reduce the velocity of the return flue gas.
[0020] During operation, cold air enters the connecting hood 3 through the air inlet 4, is diverted by the guide plate 15, and then enters the heat storage chamber 7. The cold air exchanges heat with the heat storage body 2, heating the cold air. The hot air then enters the premixing chamber 8, and the premixing regulating valve 13 is opened. Coal gas enters the air pipeline 6 within the premixing chamber 8 through the premixed coal gas pipeline 10. The coal gas mixes with the hot air, utilizing the high temperature of the hot air to first crack the coal gas before combustion, ensuring no flameout and complete combustion. When the premixing chamber reaches high temperature, the premixing regulating valve 13 is closed, and the external mixing regulating valve 14 is opened. Coal gas is transported to the outside of the outlet 9 through the external mixing coal gas pipeline 11. The hot air mixes with the coal gas outside the nozzle for combustion, which reduces the combustion flame temperature and thus lowers the NO content in the flue gas. x The purpose of emissions is to heat the slag pack and other equipment in the heating furnace to a high temperature of over 1450°C and maintain it using ultra-high temperature, low-NOx regenerative burners.
[0021] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.
Claims
1. A high-temperature, low-nitrogen regenerative burner, characterized in that: The system includes a shell, a heat storage body, a connecting cover, an air inlet, and a gas pipeline. The shell has an ignition burner mounting hole and an air pipeline inside. The shell's inner cavity is divided into a heat storage chamber and a premixing chamber. The air pipeline passes through the heat storage chamber and the premixing chamber, forming an outlet at the end of the premixing chamber. The gas pipeline connects to the premixing chamber. A heat storage body is installed inside the heat storage chamber and is fitted onto the air pipeline. The heat storage chamber is connected to the connecting cover, which has an air inlet. The air inlet, connecting cover, air pipeline, and outlet form an air intake pipeline, which serves as a high-temperature flue gas discharge pipeline when discharging flue gas in the reverse direction. The gas pipeline includes a premixed gas pipeline and an externally mixed gas pipeline. The premixed gas pipeline connects to the air pipeline inside the premixing chamber, and the externally mixed gas pipeline extends outside the premixing chamber, facing the outlet.
2. The ultra-high temperature, low-NOx regenerative burner according to claim 1, characterized in that: The gas pipeline includes a premixed gas pipeline, an externally mixed gas pipeline, a main gas pipeline, a premixed regulating valve, and an externally mixed regulating valve. The main gas pipeline is equipped with a premixed regulating valve and an externally mixed regulating valve. The main gas pipeline is connected to the premixed gas pipeline through the premixed regulating valve, and the main gas pipeline is connected to the externally mixed gas pipeline through the externally mixed regulating valve.
3. The ultra-high temperature, low-NOx regenerative burner according to claim 2, characterized in that: The flow rate of premixed gas pipeline accounts for 0-30% of the total gas volume, and the flow rate of externally mixed gas pipeline accounts for 0-100% of the total gas volume.
4. The ultra-high temperature, low-NOx regenerative burner according to claim 1, characterized in that: The heat storage body stores heat in the high-temperature flue gas emission pipeline and releases heat in the air intake pipeline.
5. The ultra-high temperature, low-NOx regenerative burner according to claim 1, characterized in that: A baffle is installed inside the connecting cover.
6. The ultra-high temperature, low-NOx regenerative burner according to claim 1, characterized in that: The air duct at the air outlet has a reduced diameter structure.
7. The ultra-high temperature, low-NOx regenerative burner according to claim 1, characterized in that: The heat storage chamber is equipped with wind deflectors.