Ultra-low nitrogen emission gas burner

Abstract

The present invention discloses an ultra-low nitrogen emission gas burner, wherein the burner body is provided with a bellows, a gas distribution package, a gas nozzle, an air multiple distributor, a gas multiple distributor, and an enhanced combustion chamber, wherein the gas pipeline is connected to the gas distribution package, the gas distribution package is connected to the gas multiple distributor, the gas multiple distributor is provided with gas spray holes, and the openings of the gas spray holes are on the wall of the enhanced combustion chamber; the air pipeline is connected to the bellows, the bellows is connected to the air multiple distributor, the air multiple distributor is provided with air spray holes, and the openings of the air spray holes are on the wall of the enhanced combustion chamber. The present invention can divide the flame into many small torches, mix the combustion flue gas into the secondary air, and then burn it with the remaining gas, so that the temperature generated by each small torch is quickly dissipated, so that the flame temperature is low when the flame is controlled, thereby generating NO X Emissions will be low.

Description

Technical Field

[0001] The invention relates to a combustion device used in an industrial fuel furnace, in particular to an ultra-low nitrogen emission gas burner used in an industrial fuel furnace. Background Art

[0002] Industrial furnaces are divided into two categories according to the heating method: one is the flame furnace (or fuel furnace), which uses the heat from the combustion of solid, liquid or gaseous fuel in the furnace to heat the workpiece; the second is the electric furnace, which converts electrical energy into heat for heating in the furnace.

[0003] According to the national standard GB 13271-2012 "Boiler Air Pollutant Emission Standards": New gas boiler NOx emissions cannot exceed 200mg / m³ (100ppm), and key areas cannot exceed 150mg / m³ (75ppm). Due to the high temperature of the fuel furnace in the metallurgical industry, generally around 1100℃, the old product NO X Emissions are generally (240~300) mg / m 3 With the improvement of national environmental protection requirements for NOx emissions, the original fuel furnace can no longer meet the requirements. Since the fuel is burned in the industrial fuel furnace through the burner installed on the industrial furnace, the performance of the burner is directly related to the NOx emission of the industrial furnace fuel. It is feasible to reduce NOx emissions by improving the burner used in the industrial fuel furnace. Summary of the invention

[0004] The purpose of the present invention is to provide a gas burner for industrial fuel furnaces, which has a simple structure and is easy to maintain. It has no specific size requirements for the combustion furnace space of the industrial fuel furnace, and the final flue gas emission NOX is less than 58mg / m 3 .

[0005] The technical solution adopted by the present invention is: an ultra-low nitrogen emission gas burner, including a burner body, characterized in that: the burner body is a single cylinder, a bellows, a gas distribution package, a gas nozzle, an air multiple distributor, a gas multiple distributor, and an enhanced combustion chamber are arranged in the single cylinder, one end of the single cylinder is connected to a gas pipeline and an air pipeline, the gas pipeline is connected to the gas distribution package, the gas distribution package is an internal hollow structure, the gas distribution package is connected to the gas multiple distributor, the gas multiple distributor is a plurality of gas nozzles arranged in parallel and arranged in a ring, the rear half of the gas nozzle is distributed with gas spray holes with adjustable gas volume, and the opening of the gas spray hole is on the wall of the enhanced combustion chamber; the air pipeline is connected to the bellows, the bellows is connected to the air multiple distributor, the air multiple distributor is the space outside the rear half of the gas nozzle of the gas multiple distributor, the air multiple distributor is distributed with air spray holes, and the opening of the air spray holes is on the wall of the enhanced combustion chamber.

[0006] The gas distribution package of the present invention is welded into a whole with the gas nozzle, the air multiple distributor, the gas multiple distributor and the enhanced combustion chamber, and the wind box exists separately.

[0007] The air spray hole and the gas spray hole of the present invention adopt a concentric circle hole structure, and the air spray hole is outside the gas spray hole.

[0008] The gas spray holes are distributed at equal intervals.

[0009] The key innovations of the present invention are: 1. The flame is divided and burned through the gas nozzle. 2. The flue gas is recycled in the enhanced combustion chamber. 3. The flame is divided into many small torches under the oxygen-deficient condition. The flue gas generated by the flame at the root of the burner is mixed with the secondary air and then burned with the remaining gas, so that the temperature generated by each small torch is quickly dissipated. In this way, the flame is controlled to keep the flame temperature low, so that the NO generated is reduced. X Emissions will be low. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the present invention;

[0011] Figure 2 is a gas and air flow diagram of the present invention;

[0012] In the figure, 1. air duct; 2. bellows; 3. air multi-distributor; 4. gas duct; 5. gas distribution package; 6. gas multi-distributor; 7. enhanced combustion chamber. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0014] The structures of the various components of the present invention are all independent, and the various components are connected in a split combination manner, and sufficient space is left between the air multiple distributor and the gas distribution package for mixing air and gas in proportion. The structure of the present invention unifies the air and gas into the same channel intensified combustion chamber, and completes the secondary combustion in the intensified combustion chamber, thereby optimizing the process in which other general low-nitrogen burners must first allow the gas and air to enter the furnace or a special combustion chamber before they can be re-proportioned for combustion. Therefore, the structure of the present invention has fully met the environmental use requirements required by the user when the combustion is completed and enters the equipment, and the purpose of efficient energy saving and consumption reduction is achieved in advance under corresponding circumstances.

[0015] The structure and layout features of the present invention are further described below:

[0016] from Figure 1It can be seen that the present invention provides an ultra-low nitrogen emission gas burner, including a burner body, the burner body is a single cylinder, the single cylinder is provided with a bellows 2, a gas distribution package 5, a gas nozzle, an air multiple distributor 3, a gas multiple distributor 6, and an enhanced combustion chamber 7, one end of the single cylinder is connected to a gas pipeline 4 and an air pipeline 1, the gas pipeline is connected to the gas distribution package, the gas distribution package is an internal hollow structure, the gas distribution package is connected to the gas multiple distributor, the gas multiple distributor is a plurality of gas nozzles arranged in parallel and arranged in a ring, the rear half of the gas nozzle is distributed with gas spray holes with adjustable gas volume, and the opening of the gas spray hole is on the wall of the enhanced combustion chamber; the air pipeline is connected to the bellows, the bellows is connected with the air multiple distributor, the air multiple distributor is the space outside the rear half of the gas nozzle of the gas multiple distributor, the air multiple distributor is distributed with air spray holes with adjustable gas volume, and the opening of the air spray hole is on the wall of the enhanced combustion chamber. The air spray hole and the gas spray hole of the present invention adopt a concentric circle hole structure, and the air spray hole is outside the gas spray hole.

[0017] All components of the burner of the present invention are formed by welding, and the overall product appearance is a single cylindrical shape, without any complex external components, with a simple and beautiful appearance and strong practicality; at the same time, the internal gas distribution package and the gas nozzle, air multi-distributor, gas multi-distributor, and enhanced combustion chamber are all connected into a whole by welding, and the bellows exists separately.

[0018] from Figure 2 It can be seen that the combustion-supporting air passes through the air pipe 1 and the bellows 2 into the air multiple distributor 3, and enters the enhanced combustion chamber 7 from the air nozzle. The gas enters the gas distribution package 5 through the gas pipe 4 and is distributed to the gas nozzle of the gas multiple distributor 6 to enter the enhanced combustion chamber 7. When the gas and air enter the enhanced combustion chamber through their respective nozzles, the gas is first burned with part of the air, and the flue gas generated by the combustion is mixed with the secondary air distributed by the air multiple distributor and then mixed with the unburned gas for combustion. Since each small torch has a certain distance, the high temperature generated is cooled by the secondary air dilution heat. The secondary air is mixed with the flue gas and then burns twice with the remaining gas. In this way, the flame temperature of the entire combustion process is controlled, and the NOX generated by the high temperature is controlled accordingly.

[0019] The embodiments described in the present invention are merely descriptions of the preferred implementation modes of the invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have all been recorded in the claims.

Claims

1. An ultra-low nitrogen emission gas burner, comprising a burner body, characterized in that: The burner body is a single cylinder, in which a bellows, a gas distribution package, a gas nozzle, an air multiple distributor, a gas multiple distributor, and an enhanced combustion chamber are arranged. One end of the single cylinder is connected to a gas pipeline and an air pipeline, the gas pipeline is connected to the gas distribution package, the gas distribution package is an internal hollow structure, the gas distribution package is connected to the gas multiple distributor, the gas multiple distributor is a plurality of gas nozzles arranged in parallel and arranged in a ring, the rear half of the gas nozzle is distributed with gas spray holes with adjustable gas volume, and the openings of the gas spray holes are on the wall of the gas nozzle; the air pipeline is connected to the bellows, the bellows is connected to the air multiple distributor, the air multiple distributor is the space outside the rear half of the gas nozzle of the gas multiple distributor, the air multiple distributor is distributed with air spray holes, and the openings of the air spray holes are on the wall of the enhanced combustion chamber; The gas distribution package in the burner body is welded into a whole with the gas nozzle, the air multiple distributor, the gas multiple distributor and the enhanced combustion chamber, and the wind box exists separately; The air spray hole and the gas spray hole adopt a concentric circle hole structure, and the air spray hole is outside the gas spray hole; The combustion-supporting air passes through the air duct and the bellows and enters the air multiple distributor, and enters the enhanced combustion chamber from the air nozzle. The gas enters the gas distribution bag through the gas pipeline and is distributed to the gas nozzle of the gas multiple distributor and enters the enhanced combustion chamber. When the gas and air enter the enhanced combustion chamber through their respective nozzles, the gas is first burned with part of the air, and the flue gas generated by the combustion is mixed with the secondary air distributed by the air multiple distributor and then mixed with the unburned gas for combustion. Since each small torch has a certain distance between them, the high temperature generated is cooled by the dilute heat of the secondary air. The secondary air is mixed with the flue gas and then burned twice with the remaining gas, so that the flame temperature of the entire combustion process is controlled, and the NOX generated by the high temperature is controlled accordingly.

2. The ultra-low nitrogen emission gas burner according to claim 1 is characterized in that: The gas spray holes are distributed at equal intervals.

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