High-speed low-oxygen nozzle for heating interior of kiln body

Abstract

The utility model discloses a high-speed low-oxygen nozzle for heating the interior of a kiln body, which comprises a tunnel kiln, and a kiln car moves in the tunnel kiln; reaction tanks are arranged at the top of the kiln car in an array manner; kiln doors are arranged at the two ends of the tunnel kiln; the device further comprises a high-speed low-oxygen nozzle, an air inlet and a heat exchange interlayer. The heat exchange interlayer is a cavity in the tunnel kiln wall; the air inlet is formed in the wall of the tunnel kiln and communicated with the heat exchange interlayer, and the air inlet is communicated with the fan; the multiple high-speed low-oxygen nozzles are located on the side, close to an inlet, of the tunnel kiln, one ends of the high-speed low-oxygen nozzles face the interior of the tunnel kiln, and the other ends of the high-speed low-oxygen nozzles communicate with the heat exchange interlayer. The temperature of air entering the tunnel kiln is increased through the heat exchange interlayer, the combustion temperature is increased, the combustion efficiency is improved, the oxygen content is reduced, and the reduction effect is improved. Combustion is carried out in the combustion chamber, high-temperature gas is discharged through pressurization, rapid flowing of the high-temperature gas in the kiln is improved, the temperature difference in the kiln is reduced, and the reduction effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion nozzles, and more specifically to a high-speed low-oxygen nozzle used for heating inside a kiln body. Background Art

[0002] The existing vanadium-titanium magnetite reduction adopts the tunnel kiln direct reduction method, and enters the tunnel kiln for high-temperature reduction. The tunnel kiln is currently heated and a combustion nozzle is often used. When the existing combustion nozzle is heated, a large amount of air needs to be introduced to ensure the combustion of the gas. The air temperature entering the nozzle is low, the ignition speed is slow, and the oxygen consumption is insufficient, resulting in an excessively high oxygen content, which leads to a poor reduction effect; the heat is consumed in large quantities by the outer wall of the tunnel kiln, resulting in heat waste. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the utility model provides a high-speed low-oxygen nozzle for heating inside a kiln body.

[0004] A high-speed low-oxygen nozzle for heating inside a kiln body, comprising a tunnel kiln, a kiln car moving in the tunnel kiln; reaction tanks are arranged in an array on the top of the kiln car; kiln doors are provided at both ends of the tunnel kiln; and the high-speed low-oxygen nozzle, an air inlet, and a heat exchange interlayer;

[0005] The heat exchange interlayer is a cavity in the tunnel kiln wall;

[0006] The air inlet is opened on the tunnel kiln wall and communicates with the heat exchange interlayer, and the air inlet is connected to the fan;

[0007] There are multiple high-speed low-oxygen nozzles located near the inlet side of the tunnel kiln. One end of the high-speed low-oxygen nozzle faces the inside of the tunnel kiln, and the other end is connected to the heat exchange interlayer.

[0008] As a further preferred embodiment of the present invention, the high-speed low-oxygen nozzle includes a nozzle, an air vent, a combustion chamber, an igniter and a gas inlet, wherein the nozzle is located at one end of the high-speed low-oxygen nozzle, facing the inner side of the tunnel kiln; the air vent is opened on the side wall of the high-speed low-oxygen nozzle, and is connected to the heat exchange interlayer; the gas inlet is located on the side of the high-speed low-oxygen nozzle away from the nozzle; the combustion chamber is located on the side of the high-speed low-oxygen nozzle close to the nozzle; the igniter is conical, with its tip facing the inside of the combustion chamber, and the high-speed low-oxygen nozzle is used to heat the inside of the tunnel kiln.

[0009] As a further preference of the utility model, an annular wind shield is fixed inside the combustion chamber, located at the vent hole, the opening of the annular wind shield is away from one end of the gas inlet, and the annular wind shield is used to prevent air from driving fuel backflow and causing danger.

[0010] As a further preferred embodiment of the present invention, the sealing structure includes a protrusion arranged on the outside of the high-speed low-oxygen nozzle and a refractory castable on the inside of the tunnel kiln, and the protrusion and the refractory castable are tightly fitted to improve the sealing performance and reduce heat loss.

[0011] The technical effects and advantages of the utility model are as follows: 1. The air entering the tunnel kiln is heated by the heat exchange interlayer, the combustion temperature is increased, the combustion efficiency is improved, the oxygen content is reduced, the reduction effect is improved, and at the same time, the heat loss from the outer wall of the tunnel kiln causing heat waste is avoided.

[0012] 2. By burning in the combustion chamber, the high-temperature gas is discharged under pressure and made to flow rapidly in the kiln, so that the temperature difference in the kiln is reduced and the reduction effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a schematic diagram of the structure of a high-speed low-oxygen nozzle for heating inside a kiln body.

[0014] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0015] The accompanying drawings are marked as follows: 1. high-speed low-oxygen nozzle; 2. sealing structure; 3. tunnel kiln; 4. kiln car; 5. reaction tank; 6. air inlet; 7. kiln door; 101. air vent; 102. combustion chamber; 103. igniter; 104. gas inlet; 105. annular wind shield; 106. nozzle; 301. heat exchange interlayer. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] like Figure 1-2 As shown, in the embodiment of the utility model, a tunnel kiln 3 provided with a high-speed low-oxygen nozzle 1 comprises a tunnel kiln 3, a kiln car 4 moves in the tunnel kiln 3; reaction tanks 5 are arranged in an array on the top of the kiln car 4; kiln doors 7 are provided at both ends of the tunnel kiln 3; and the high-speed low-oxygen nozzle 1, an air inlet 6 and a heat exchange interlayer 301 are also included;

[0018] The heat exchange interlayer 301 is a cavity in the wall of the tunnel kiln 3;

[0019] The air inlet 6 is opened on the wall of the tunnel kiln 3 and communicates with the heat exchange interlayer 301, and the air inlet 6 is connected to the fan;

[0020] During the working process of the utility model, air is blown into the heat exchange interlayer 301 by the fan, and the air is heated by the heat dissipated by the tunnel kiln 3;

[0021] There are multiple high-speed low-oxygen nozzles 1, which are located near the inlet side of the tunnel kiln 3. One end of the high-speed low-oxygen nozzle 1 faces the inside of the tunnel kiln 3, and the other end is connected to the heat exchange interlayer 301;

[0022] During the working process of the utility model, one end of the tunnel kiln 3 is heated and reduced by the high-speed low-oxygen nozzle 1, and the temperature of the other end is reduced to avoid oxidation of the reduced iron.

[0023] like Figure 2 As shown, in an embodiment of the utility model, the high-speed low-oxygen nozzle 1 includes a nozzle 106, an air vent 101, a combustion chamber 102, an igniter 103 and a gas inlet 104, wherein the nozzle 106 is located at one end of the high-speed low-oxygen nozzle 1, facing the inner side of the tunnel kiln 3; the air vent 101 is opened on the side wall of the high-speed low-oxygen nozzle 1, and is connected with the heat exchange interlayer 301; the gas inlet 104 is located on the side of the high-speed low-oxygen nozzle 1 away from the nozzle 106; the combustion chamber 102 is located on the side of the high-speed low-oxygen nozzle 1 close to the nozzle 106; the igniter 103 is conical and adopts an electric igniter, with its tip facing the inside of the combustion chamber 102, reducing the contact area with the combustion chamber and reducing heat transfer, and the outer layer of the ignition device is coated with an asbestos insulation layer to avoid excessive temperature at the gas inlet 104 and prevent danger. The high-speed low-oxygen nozzle 1 is used to heat the tunnel kiln 3.

[0024] During the working process of the utility model, the hot air at the heat exchange interlayer 301 is introduced into the high-speed low-oxygen nozzle 1 through the vent hole 101 to provide oxygen, and the oxygen content in the gas is reduced by combustion to improve the reduction effect; and the gas is expanded by combustion to discharge the high-temperature gas with boost pressure, and the gas is made to flow rapidly in the kiln, so that the temperature difference in the kiln is reduced and the reduction effect is good.

[0025] like Figure 1 and Figure 2 As shown, in the embodiment of the utility model, an annular wind shield 105 is fixed to the inner side of the combustion chamber 102, located at the vent hole 101, and the opening of the annular wind shield 105 is away from one end of the gas inlet 104. The annular wind shield 105 is used to prevent the air from driving the fuel backflow, which may cause danger, and reduces the temperature at the gas inlet 104.

[0026] like Figure 1 and Figure 2As shown, in an embodiment of the utility model, the sealing structure 2 includes a protrusion arranged on the outside of the high-speed low-oxygen nozzle 1 and a refractory castable on the inside of the tunnel kiln 3. The protrusion and the refractory castable fit tightly to improve the sealing performance and reduce heat loss. The refractory castable is composed of three parts: a binder, an aggregate, and an admixture. They are common materials and are not described in detail here.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-speed low-oxygen nozzle for heating inside a kiln body, comprising a tunnel kiln, a kiln car moving inside the tunnel kiln; reaction tanks are arranged in an array on the top of the kiln car; kiln doors are provided at both ends of the tunnel kiln; characterized in that: It also includes high-speed low-oxygen nozzles, air inlets and heat exchange interlayers; The heat exchange interlayer is a cavity in the tunnel kiln wall; The air inlet is opened on the tunnel kiln wall and communicates with the heat exchange interlayer, and the air inlet is connected to the fan; There are multiple high-speed low-oxygen nozzles located near the inlet side of the tunnel kiln. One end of the high-speed low-oxygen nozzle faces the inside of the tunnel kiln, and the other end is connected to the heat exchange interlayer and the external fuel gas.

2. The high-speed low-oxygen nozzle for heating inside a kiln according to claim 1, characterized in that: The high-speed low-oxygen nozzle includes a nozzle, an air vent, a combustion chamber, an igniter and a gas inlet. The nozzle is located at one end of the high-speed low-oxygen nozzle and faces the inner side of the tunnel kiln. The air vent is provided on the side wall of the high-speed low-oxygen nozzle and is connected to the heat exchange interlayer. The gas inlet is located on the side of the high-speed low-oxygen nozzle away from the nozzle. The combustion chamber is located on the side of the high-speed low-oxygen nozzle close to the nozzle. The igniter is conical, with its tip facing the inside of the combustion chamber.

3. The high-speed low-oxygen nozzle for heating inside a kiln according to claim 2, characterized in that: An annular windshield is fixed inside the combustion chamber and is located at the air vent, and an opening of the annular windshield is away from one end of the gas inlet.

4. The high-speed low-oxygen nozzle for heating inside a kiln according to claim 1, characterized in that: A protrusion is arranged on the outer side of the high-speed low-oxygen nozzle, and a refractory castable is arranged on the inner side of the tunnel kiln. The protrusion and the refractory castable form a sealing structure, and the protrusion and the refractory castable are tightly fitted.

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