CN216620628U - Direct reduction material ejection device of iron ore coal-based rotary kiln - Google Patents
Direct reduction material ejection device of iron ore coal-based rotary kiln Download PDFInfo
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- CN216620628U CN216620628U CN202122831541.7U CN202122831541U CN216620628U CN 216620628 U CN216620628 U CN 216620628U CN 202122831541 U CN202122831541 U CN 202122831541U CN 216620628 U CN216620628 U CN 216620628U
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Abstract
The utility model provides a direct reduction material ejection device of an iron ore coal-based rotary kiln, which is characterized in that: the device comprises two pea coal spray guns with different lengths, which are arranged on a kiln hood at the discharge end of a rotary kiln, wherein one end of each pea coal spray gun extends into the rotary kiln, and the other end of each pea coal spray gun extends out of the rotary kiln and is connected with a pea coal fluidization chamber; the top of the granulated coal fluidizing chamber is provided with an inclined feeding pipe, the feeding pipe is connected with the bottom of a granulated coal feeding hopper through a screw feeder, a horizontal air inlet pipe is also arranged on the same side of the feeding pipe, one end of the air inlet pipe is connected with the granulated coal fluidizing chamber, and the other end of the air inlet pipe is connected with an external air source through an air regulating valve; and a horn-shaped fluid director is also arranged at the port of one end of the granulated coal spray gun, which extends into the rotary kiln. The utility model can convey the granular coal to a position far away from the discharge end in the rotary kiln, realize the uniform distribution of the particle size of the granular coal in the injection area and improve the reduction quality of the iron ore.
Description
Technical Field
The utility model belongs to the technical field of metallurgy and mineral engineering, relates to the technical field of rotary kilns, and particularly relates to a direct reduction material ejection device of an iron ore coal-based rotary kiln.
Background
Along with the development of the direct reduction rotary kiln technology of iron ore in the iron and steel industry, the coal pellet spray gun of the rotary kiln is more and more emphasized. Because the volatile matter content in the coal used by the rotary kiln is up to more than 40 percent, the ash content is 5 to 15 percent, the heat value is unstable, even if the coal is transported from the same production place, the heat value is always fluctuated by 2 to 3 percent, and the fluctuation of moisture and granularity also influences the direct reduction of the coal on the iron ore, so in order to obtain the high-quality direct reduction effect of the iron ore, higher requirements are put forward on a spray gun of the rotary kiln: (1) the injection quantity of the granulated coal spray gun is accurate and stable, the position of the granulated coal is far, the area and the particle size distribution of the sprayed granulated coal are uniform and adjustable, and the content of volatile matters in the coal can be still ensured under the condition of fluctuation of the heat value of the granulated coal; (2) the adjustment range of the granulated coal spray gun is large, and the use amount of the granulated coal can be adjusted from the minimum to the maximum required during normal production under the condition of not changing the internal structure; (3) the wear rate of the granulated coal spray gun is low, and a wear-resistant lining plate is required to be added at the easy-to-wear part of the spray gun and is easy to replace.
As shown in fig. 1, the existing iron ore coal-based rotary kiln adopts a granulated coal injection process of direct injection at the kiln head, the granulated coal is injected and moves in a parabolic manner in the kiln, and the injection distance of the granulated coal is farther along with the increase of the injection speed of the granulated coal under the condition of a certain position and an inclination angle of a spray gun, so that the granulated coal injection method has the advantages of reliable operation, flexible adjustment and dispersed falling points of the granulated coal. However, because the rotary kiln adopts 1 granulated coal spray gun, the granularity range of the sprayed granulated coal is as high as 3-30mm, the movement speed of the granulated coal with thicker granularity is slower in the granulated coal sprayed from the granulated coal spray gun, the spraying distance in the kiln is closer, the movement speed of the granulated coal with thinner granularity is faster, the spraying distance in the kiln is farther, the granularity distribution of the granulated coal sprayed at different positions of the discharging end in the kiln is uneven, and the roasting quality of the iron ore is reduced. Meanwhile, as the spraying port of the rotary kiln granulated coal spray gun is positioned at the kiln head, the spraying position of the granulated coal in the kiln is generally 9-12m away from the discharge end, and the shorter spraying position of the granulated coal causes that the volatile matters pyrolyzed in the coal can not be fully utilized for reduction in the direct reduction of the iron ore in the middle and later periods, thereby influencing the reduction quality of the iron ore. In addition, the kiln head coal injection equipment for the coal-based direct reduction of the iron ore rotary kiln has the advantages that a feed pipe of the currently used granular coal fluidization chamber is vertical to the flow direction of indoor compressed air, so that coal powder is easy to overflow from the feed pipe, and the environmental pollution is caused; the spray gun is parallel to the central line of the rotary kiln, the distance of the sprayed materials and the particle size distribution of the materials sprayed into different positions in the kiln can not be adjusted, and the direct reduction requirements of different iron ores can not be met.
SUMMERY OF THE UTILITY MODEL
The utility model provides a direct reduction material ejection device of an iron ore coal-based rotary kiln, which aims to solve the problems of short coal granule injection distance, small length range of an injection region and uneven particle size distribution in the injection region of a coal granule injection gun used for direct reduction of the existing iron ore rotary kiln.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a direct reduction material ejection device of an iron ore coal-based rotary kiln is characterized in that: the device comprises two pea coal spray guns with different lengths, which are arranged on a kiln hood at the discharge end of a rotary kiln, wherein one end of each pea coal spray gun extends into the rotary kiln, and the other end of each pea coal spray gun extends out of the rotary kiln and is connected with a pea coal fluidization chamber; the top of the granulated coal fluidizing chamber is provided with an inclined feeding pipe, the feeding pipe is connected with the bottom of a granulated coal feeding hopper through a screw feeder, a horizontal air inlet pipe is also arranged on the same side of the feeding pipe, one end of the air inlet pipe is connected with the granulated coal fluidizing chamber, and the other end of the air inlet pipe is connected with an external air source through an air regulating valve; and a trumpet-shaped fluid director is also arranged at the port of one end of the granulated coal spray gun, which extends into the rotary kiln.
Further, be certain contained angle between inlet pipe and the intake pipe, the angle of contained angle is 45~ 70. The design is used for preventing the backflow of the granulated coal, reducing the conveying resistance of the granulated coal and improving the conveying efficiency of the granulated coal.
Furthermore, a transmission mechanism is further arranged at the joint of the pea coal spray gun and the kiln head cover, the transmission mechanism comprises a driven rack arranged on the outer surface of the pea coal spray gun and a driving gear arranged on the kiln head cover, and the driving gear and the driven rack are meshed with each other. The coal injection gun is driven by the transmission mechanism to horizontally move along the length direction of the rotary kiln while injecting coal, and can evenly inject the coal into a section of area far away from the discharge end.
Further, the length of the longer one of the plurality of the coal injection lances. Two different length pea coal spray guns cooperate each other, can realize the even spraying of different granularity pea coal in the rotary kiln, improve iron ore reduction quality.
Furthermore, a heat insulation layer is arranged on the outer surface of the granulated coal spray gun. The heat insulating layer can be made of refractory asbestos and is used for protecting the granulated coal spray gun, preventing the granulated coal spray gun from being burnt by flame sprayed by a kiln head burner and prolonging the service life of the granulated coal spray gun.
The utility model has the beneficial effects that:
1. aiming at the current situations that the volatile matter separation time of small-granularity granular coal at high temperature in the kiln is short and the volatile matter separation time of large-granularity granular coal at high temperature in the kiln is long, two granular coal spray guns with different lengths are matched with each other, the granular coal with larger granularity is sprayed to the far end away from the discharge port of the rotary kiln through the longer granular coal spray gun, and the granular coal with smaller granularity is sprayed to the near end away from the discharge port of the rotary kiln through the shorter granular coal spray gun, so that the atmosphere concentration of the iron ore reduced in the middle and later periods in the rotary kiln is enhanced, the reduction time of the iron ore is prolonged, and the reduction quality of the iron ore is improved.
2. The horn-shaped fluid director arranged on the granulated coal spray gun is matched with the transmission mechanism, so that the granulated coal is uniformly distributed in the length direction in the rotary kiln, and the uniformity of the reduction quality of the iron ore is ensured.
Drawings
FIG. 1 is a schematic structural view of a direct reduction material ejection device of an iron ore coal-based rotary kiln in the prior art;
FIG. 2 is a schematic structural view of a direct reduction material ejection device of the iron ore coal-based rotary kiln of the present invention;
in the figure, 1-rotary furnace, 2-kiln head cover, 3-iron ore charging hopper, 4-kiln head burner, 5-roasting material outlet, 6-granular coal spray gun, 7-granular coal fluidizing chamber, 8-granular coal charging hopper, 9-feeding pipe, 10-spiral feeder, 11-air inlet pipe, 12-air regulating valve, 13-roasting material, 14-fluid director, 15-transmission mechanism and 16-heat insulation layer.
Detailed Description
The utility model is further explained below with reference to the drawings and the detailed description.
As shown in fig. 1, the direct reduction material ejecting device of iron ore coal-based rotary kiln among the prior art, including setting up the pea coal spray gun 6 on kiln hood cover 2, inside pea coal spray gun 6 one end stretched into rotary furnace 1, the other end stretches out rotary furnace 1 and is connected with pea coal fluidization chamber 7, pea coal fluidization chamber top is equipped with vertical inlet pipe 9, inlet pipe 9 is connected with 8 bottoms of pea coal loading hopper through screw feeder 10, 7 bottoms of pea coal fluidization chamber of inlet pipe 9 homonymy still are equipped with intake pipe 11, intake pipe 11 is connected with external air source through air control valve.
The working principle is as follows: the pea coal mixed with the compressed air is sprayed into the rotary kiln 1 through the pea coal spray gun 6, the pea coal is in parabolic motion in the rotary kiln 1 after being sprayed, and under the condition that the position and the inclination angle of the pea coal spray gun 6 are fixed, the distance of the pea coal sprayed is farther along with the increase of the blowing speed of the pea coal, and the pea coal spraying method has the advantages of reliable operation, flexible adjustment and dispersed pea coal falling points. However, only one pea coal spray gun 6 is arranged, and the pea coal spray gun 6 extends into the rotary kiln 1 for a distance, so that the pea coal injection area is small, and pea coal with different particle sizes cannot be uniformly dispersed and injected into the rotary kiln 1, and the reduction quality level of the iron ore in the rotary kiln 1 is uneven. Meanwhile, the feeding pipe 9 is vertical to the gas flowing direction, so that the back flushing of the granulated coal is easy to cause and the environment is polluted.
In order to solve the problems in the prior art, the utility model adopts the following technical scheme:
as shown in fig. 2, the direct reduction material ejection device for the iron ore coal-based rotary kiln comprises two granular coal spray guns 6 with different lengths, which are arranged on a kiln head cover 2 at the discharge end of the rotary kiln 1, wherein one ends of the granular coal spray guns 6 extend into the rotary kiln 1, and the other ends of the granular coal spray guns extend out of the rotary kiln 1 and are connected with a granular coal fluidization chamber 7; an inclined feeding pipe 9 is arranged at the top of the granulated coal fluidizing chamber 7, the feeding pipe 9 is connected with the bottom of a granulated coal feeding hopper 8 through a screw feeder 10, a horizontal air inlet pipe 11 is further arranged at the same side of the feeding pipe 9, an angle formed between the air inlet pipe 11 and the feeding pipe 9 is 45-70 degrees, one end of the air inlet pipe 11 is connected with the granulated coal fluidizing chamber 7, and the other end of the air inlet pipe is connected with an external air source through an air regulating valve 12; a trumpet-shaped fluid director 14 is also arranged at the port of one end of the granulated coal spray gun 6 extending into the rotary kiln 1, and a heat insulation layer 16 made of refractory chamber cotton is laid on the outer surface of the granulated coal spray gun 6.
The junction of the pea coal spray gun 6 and the kiln hood cover 2 is also provided with a transmission mechanism 15, the transmission mechanism 15 comprises a driven rack arranged on the outer surface of the pea coal spray gun and a driving gear arranged on the kiln hood cover 2, the driving gear and the driven rack are meshed for transmission, the driving gear is connected with a motor, and the motor is controlled to rotate forward and backward through a PLC (programmable logic controller), so that the pea coal spray gun can move back and forth.
The two granulated coal injection lances 6 having different lengths have the same connection relationship with other parts and the same external dimensions except for the different lengths. Wherein, the length of a longer pea coal spray gun is about twice of the length of a shorter pea coal spray gun, and a longer pea coal spray gun is installed at kiln hood 2 middle part, and a shorter pea coal spray gun is installed in a longer pea coal spray gun below, 2 edges of kiln hood promptly.
When the material spraying device is used, an air source (compressed air) is connected, the spiral feeder 10 is started, 10-30 mm of granulated coal and the compressed air are mixed into a gas-solid two-phase flow through a longer granulated coal spray gun and are sprayed into the middle rear part of the rotary kiln 1, and 3-10 mm of granulated coal and the compressed air are mixed into a gas-solid two-phase flow through a shorter granulated coal spray gun and are sprayed into the front end of the rotary kiln 1. When spraying material, the transmission mechanism 15 is controlled by the PLC, so that the granulated coal spray gun 6 moves back and forth along the length direction of the rotary kiln 1 while spraying material, and the flared fluid director 14 arranged at the outlet of the granulated coal spray gun 6 is combined to realize the uniform distribution of the granulated coal in the rotary kiln 1. The uniformly distributed granular coal is firstly gasified under the action of high temperature to produce a large amount of hydrocarbon, the hydrocarbon is fully cracked at high temperature to produce hydrogen and active granular carbon, and the hydrogen is used as a reducing agent to perform reduction reaction with iron ore. As the granular coal is uniformly distributed among different particle sizes in the rotary kiln 1, the sufficient reducing atmosphere is ensured to be always in the rotary kiln 1, thereby ensuring the reducing quality of the iron ore.
Claims (5)
1. A direct reduction material ejection device of an iron ore coal-based rotary kiln is characterized in that: the device comprises two pea coal spray guns with different lengths, which are arranged on a kiln hood at the discharge end of a rotary kiln, wherein one end of each pea coal spray gun extends into the rotary kiln, and the other end of each pea coal spray gun extends out of the rotary kiln and is connected with a pea coal fluidization chamber; the top of the granulated coal fluidizing chamber is provided with an inclined feeding pipe, the feeding pipe is connected with the bottom of a granulated coal feeding hopper through a screw feeder, a horizontal air inlet pipe is also arranged on the same side of the feeding pipe, one end of the air inlet pipe is connected with the granulated coal fluidizing chamber, and the other end of the air inlet pipe is connected with an external air source through an air regulating valve; and a trumpet-shaped fluid director is also arranged at the port of one end of the granulated coal spray gun, which extends into the rotary kiln.
2. The direct reduction material injection apparatus of an iron ore coal-based rotary kiln according to claim 1, characterized in that: be certain contained angle between inlet pipe and the intake pipe, the angle of contained angle is 45~ 70.
3. The direct reduction material injection apparatus of an iron ore coal-based rotary kiln according to claim 1, characterized in that: the junction of the pea coal spray gun and the kiln hood is also provided with a transmission mechanism, the transmission mechanism comprises a driven rack arranged on the outer surface of the pea coal spray gun and a driving gear arranged on the kiln hood, and the driving gear is meshed with the driven rack.
4. The direct reduction material injection apparatus of an iron ore coal-based rotary kiln according to claim 1, characterized in that: the length of the longer one of the coal injection guns is about twice that of the shorter one of the coal injection guns.
5. The direct reduction material injection apparatus of an iron ore coal-based rotary kiln according to claim 1, characterized in that: and a heat insulation layer is also arranged on the outer surface of the granulated coal spray gun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122831541.7U CN216620628U (en) | 2021-11-18 | 2021-11-18 | Direct reduction material ejection device of iron ore coal-based rotary kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122831541.7U CN216620628U (en) | 2021-11-18 | 2021-11-18 | Direct reduction material ejection device of iron ore coal-based rotary kiln |
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| Publication Number | Publication Date |
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| CN216620628U true CN216620628U (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122831541.7U Active CN216620628U (en) | 2021-11-18 | 2021-11-18 | Direct reduction material ejection device of iron ore coal-based rotary kiln |
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| CN (1) | CN216620628U (en) |
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2021
- 2021-11-18 CN CN202122831541.7U patent/CN216620628U/en active Active
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Inventor after: Wu Zhenzhong Inventor after: Chen Degui Inventor after: Quan Fangmin Inventor after: Ma Shengjun Inventor before: Wu Zhenzhong Inventor before: De Gui Inventor before: Quan Fangmin Inventor before: Ma Shengjun |