Rotary kiln burner

Abstract

The utility model discloses a rotary kiln combustor, which belongs to the technical field of rotary kiln combustors and is characterized in that a pre-combustion chamber is arranged at the flame end of a combustor cavity, a primary cooling air duct is arranged outside the combustor cavity, a secondary cooling air duct is arranged outside the pre-combustion chamber, and the primary cooling air duct is communicated with the secondary cooling air duct. An air inlet is formed in the first-stage cooling air duct and connected with cooling air supply equipment. By arranging the pre-combustion chamber and the cooling air system, the problems of unstable combustion of pulverized coal in the rotary kiln, disturbance of flue gas and dust, oxygen consumption and the like are solved, and the flame stability during combustion is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln burner technology. Background Technology

[0002] In the non-ferrous smelting industry, the existing rotary kiln production mode is intermittent. When the rotary kiln is extinguished and production stops, the temperature inside the kiln drops below 200℃, which is the "cold kiln" state. In the "cold kiln" state, since the ignition temperature of the pulverized coal is 700-800℃, this temperature cannot guarantee that the pulverized coal can burn stably in the rotary kiln. At the same time, because the flue gas and dust inside the kiln disturb the combustion flame after the rotary kiln rotates, it is impossible for natural gas and pulverized coal to burn stably. This results in phenomena such as short and coarse flames, unstable flames, flameout, deflagration, and frequent fire extinguishing when natural gas and pulverized coal burn in the rotary kiln, which pose safety risks. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model discloses a rotary kiln burner. By incorporating a pre-combustion chamber and a cooling air system, it solves the problems of unstable combustion of pulverized coal inside the rotary kiln, flue gas dust disturbance, and high oxygen consumption, thereby enhancing flame stability during combustion.

[0004] The technical solution of this utility model is: a rotary kiln burner, wherein a pre-combustion chamber is provided at the flame end of the burner cavity, a primary cooling duct is provided outside the burner cavity, a secondary cooling duct is provided outside the pre-combustion chamber, the primary cooling duct and the secondary cooling duct are interconnected, an air inlet is provided on the primary cooling duct and the air inlet is connected to a cooling air supply device, and the secondary cooling duct and the pre-combustion chamber are connected to the reinforcing rib by welding.

[0005] A further improvement of this utility model is that an insulation layer is installed on the inner wall of the pre-combustion chamber by anchors. The inner wall material of the pre-combustion chamber is 3Cr24Ni7SiNRe high-temperature heat-resistant steel, which has a heat storage function and can ensure the stable combustion of pulverized coal and natural gas.

[0006] A further improvement of this utility model is that the flame end of the burner cavity is connected to the pre-combustion chamber via a flange, which facilitates maintenance and replacement.

[0007] A further improvement of this utility model is that the primary cooling duct and the secondary cooling duct are connected by flange bolts, and four stiffening plates are evenly distributed around the secondary cooling duct and the pre-combustion chamber to provide mutual fixation and support.

[0008] A further improvement of this utility model is that the inner wall material of the pre-combustion chamber is 3Cr24Ni7SiNRe high-temperature heat-resistant steel.

[0009] A further improvement of this utility model is that the cooling air supply device includes a cooling fan, and the air outlet of the cooling fan is connected to the air inlet in sequence through a regulating valve and a connecting air pipe.

[0010] The beneficial effects of this utility model are:

[0011] 1. By setting a pre-combustion chamber at the flame end of the burner cavity, combustion efficiency is improved and pollutant emissions are reduced. The synergistic cooling structure of primary and secondary cooling ducts enhances the heat dissipation capacity of the high-temperature area of ​​the burner, reduces flue gas disturbance during combustion, avoids local overheating damage, and improves cooling efficiency through cooling airflow.

[0012] 2. An insulation layer fixed with anchors is installed on the inner wall of the pre-combustion chamber to effectively reduce heat loss, maintain the high temperature environment in the pre-combustion chamber, promote complete combustion of fuel, and at the same time, the anchors ensure the stability of the insulation layer under high temperature and vibration conditions, prevent it from falling off, and extend the service life of the pre-combustion chamber.

[0013] 3. The flame end of the burner chamber is connected to the pre-combustion chamber by a flange, which facilitates quick disassembly and maintenance, reduces downtime, and at the same time, the flange connection has good sealing performance to prevent high-temperature flue gas leakage and improve the safety of equipment operation.

[0014] 4. Connecting the primary and secondary cooling ducts with flange bolts modularizes the cooling system, facilitating transportation, installation, and maintenance. It also allows for the replacement of damaged parts in sections, reducing maintenance costs and improving the maintainability and economy of the equipment.

[0015] 5. 3Cr24Ni7SiNRe high-temperature heat-resistant steel is used as the inner wall material of the pre-combustion chamber, which gives it excellent high-temperature resistance, oxidation resistance and corrosion resistance, enabling it to withstand extreme combustion environments, reduce material degradation and extend the service life of the pre-combustion chamber; Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the pre-combustion chamber of this utility model;

[0018] Figure 3 This is a schematic diagram of the circumferential stiffening plate of this utility model;

[0019] In the diagram: 1. Burner chamber, 2. Primary cooling duct, 3. Secondary cooling duct, 4. Pre-combustion chamber, 5. Rib plate, 6. Anchor, 7. Insulation layer, 8. Flange, 9. Bolt, 10. Air inlet, 11. Air duct, 12. Regulating valve, 13. Cooling fan. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] See Figure 1 and Figure 2 This utility model discloses a rotary kiln burner, including a burner cavity 1 with a pre-combustion chamber 4 at the flame end, a primary cooling duct 2 outside the burner cavity 1, a secondary cooling duct 3 outside the pre-combustion chamber 4, the primary cooling duct 2 and the secondary cooling duct 3 being interconnected, and an air inlet 10 being provided on the primary cooling duct 2, which is connected to a cooling air supply device.

[0022] An insulation layer 7 is installed on the inner wall of the pre-combustion chamber 4 via anchors 6.

[0023] The flame end of the burner chamber 1 is connected to the pre-combustion chamber 4 via flange 8.

[0024] The primary cooling duct 2 and the secondary cooling duct 3 are connected by flange bolts.

[0025] The inner wall of the pre-combustion chamber 4 is made of 3Cr24Ni7SiNRe high-temperature heat-resistant steel.

[0026] During normal production, after the natural gas and pulverized coal are burned in the pre-combustion chamber 4, the high-temperature hot flue gas is introduced into the rotary kiln. The pre-combustion chamber 4 plays a role in maintaining flame stability and resisting interference from smoke and dust. The cooling fan provides cooling air to the primary cooling duct 2 and the secondary cooling duct 3, which not only prevents the pre-combustion chamber 4 from burning out, but also serves as process air to increase the oxygen required for combustion in the rotary kiln, while preventing the flue gas and dust in the kiln from disturbing the combustion flame.

Claims

1. A rotary kiln burner, characterized in that, A pre-combustion chamber (4) is provided at the flame end of the burner cavity (1). A primary cooling duct (2) is provided outside the burner cavity (1). A secondary cooling duct (3) is provided outside the pre-combustion chamber (4). The primary cooling duct (2) and the secondary cooling duct (3) are interconnected. An air inlet (10) is provided on the primary cooling duct (2). The air inlet (10) is connected to the cooling air supply equipment.

2. The rotary kiln burner according to claim 1, characterized in that, An insulation layer (7) is installed on the inner wall of the pre-combustion chamber (4) by anchors (6).

3. The rotary kiln burner according to claim 1, characterized in that: The flame end of the burner cavity (1) is connected to the pre-combustion chamber (4) via a flange (8).

4. The rotary kiln burner according to claim 1, characterized in that: The primary cooling duct (2) and the secondary cooling duct (3) are connected by flange bolts (9), and four stiffening plates (5) are evenly distributed around the secondary cooling duct (3) and the pre-combustion chamber (4).

5. A rotary kiln burner according to claim 1, characterized in that: The inner wall material of the pre-combustion chamber (4) is 3Cr24Ni7SiNRe high-temperature heat-resistant steel.

6. The rotary kiln burner according to claim 1, characterized in that: The cooling air supply equipment includes a cooling fan (13), the air outlet of which is connected to the air inlet (10) in sequence through a regulating valve (12) and a connecting air pipe (11).

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