CN221376338U - Direct reduction rotary kiln flue gas treatment device - Google Patents
Direct reduction rotary kiln flue gas treatment device Download PDFInfo
- Publication number
- CN221376338U CN221376338U CN202323241937.1U CN202323241937U CN221376338U CN 221376338 U CN221376338 U CN 221376338U CN 202323241937 U CN202323241937 U CN 202323241937U CN 221376338 U CN221376338 U CN 221376338U
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- flue gas
- treatment chamber
- gas treatment
- air
- rotary kiln
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 175
- 239000003546 flue gas Substances 0.000 title claims abstract description 175
- 230000005484 gravity Effects 0.000 claims abstract description 18
- 230000008021 deposition Effects 0.000 claims abstract description 10
- 238000004062 sedimentation Methods 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims description 18
- 238000009826 distribution Methods 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims 6
- 239000007924 injection Substances 0.000 claims 6
- 239000000428 dust Substances 0.000 abstract description 27
- 239000000779 smoke Substances 0.000 abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000011362 coarse particle Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The utility model discloses a direct reduction rotary kiln flue gas treatment device, wherein a feeding end of a rotary kiln is connected with a vertical flue gas treatment chamber, the feeding end of the rotary kiln is flexibly and hermetically connected with the side wall of the flue gas treatment chamber, and the cross section of the flue gas treatment chamber is more than three times of the cross section of a kiln tail cover of the rotary kiln; the feeding pipe of the rotary kiln vertically penetrates downwards from the top of the flue gas treatment chamber and penetrates into the rotary kiln; the bottom of the flue gas treatment chamber is provided with an ash deposition discharge port, and the top of the flue gas treatment chamber is connected with a smoke exhaust main pipe; the lower part of the flue gas treatment chamber is a gravity sedimentation chamber, the upper part of the flue gas treatment chamber is a combustible component treatment chamber, the gravity sedimentation chamber is used for sedimentation of particulate matters in the flue gas, and the combustible component treatment chamber is used for burning combustible components in the flue gas; an air supply system is arranged in the combustible component disposal chamber. The utility model can realize the standard discharge of the discharged flue gas, reduce the dust content of the flue gas before the combustible components are treated, reduce the ash removing device and shorten the flow stroke of the flue gas.
Description
Technical Field
The utility model belongs to the technical field of metallurgy and mineral engineering, and particularly relates to a direct reduction rotary kiln flue gas treatment device.
Background
In the process of directly reducing the iron ore by the rotary kiln, high-temperature flue gas discharged from the feeding end of the rotary kiln contains a certain amount of combustible components such as CO, H 2 and the like, and if the flue gas is not treated, the flue gas is discharged after dust removal by a dust remover and desulfurization by a desulfurization device, and the flue gas cannot reach the emission standard due to higher CO content.
In order to realize standard emission of flue gas discharged by directly reducing iron ore into a rotary kiln, at present, the common practice at home and abroad is to firstly enter high-temperature flue gas discharged from a feeding end of the rotary kiln into a kiln tail cover, most coarse grain dust in the flue gas is removed under the action of gravity, the flue gas after coarse dust removal enters a secondary combustion chamber through a smoke exhaust pipeline, the high-temperature flue gas is combusted after being mixed with combustion air fed by an air supply system, and the high-temperature flue gas after secondary combustion is recycled by a waste heat recovery device, is cooled, is dedusted by a dedusting system, is pressurized by a fan system and is desulfurized by a desulfurizing system, and is finally discharged into the atmosphere through a chimney.
FIG. 1 is a diagram of a conventional direct reduction rotary kiln flue gas treatment system. In the secondary combustion chamber of the rotary kiln, the secondary combustion chamber consists of an air supply system, a smoke exhaust main pipe, a smoke exhaust port, accumulated ash and a smoke exhaust pipeline, wherein the air supply system consists of a blower, an air main pipe, an air distribution pipe, a regulating valve and an air ejection port. Air blown by the blower enters the air distribution pipe through the air main pipe, and is sprayed into the secondary combustion chamber according to the process requirement through the air distribution pipe and the regulating valve. The air injected into the secondary combustion chamber is combusted with the combustible components in the high-temperature flue gas flowing from bottom to top in the horizontal jet flow process in the process of flowing and mixing. At present, the main problems of the direct reduction rotary kiln flue gas treatment system are as follows:
1) In a secondary combustion chamber of the rotary kiln, because the mixing condition of high-temperature flue gas and normal-temperature air is poor, combustible components in the flue gas are difficult to completely burn, the content of CO in the flue gas discharged from the secondary combustion chamber is up to 1-3%, and standard emission cannot be achieved.
2) In a kiln tail hood of the rotary kiln, in the horizontal flow process of the flue gas, the flue gas and dust flow in the same direction, the flow speed of the flue gas is not changed greatly, the dust removal efficiency in the flue gas is low, most of dust particles are brought into a secondary combustion chamber by high-temperature flue gas, combustible components in the flue gas are combusted under the action of combustion air, the dust particles easily generate low-melting-point liquid phase, and the molten liquid phase is adhered to the inner wall of the secondary combustion chamber, so that the long-term stable and smooth operation of the production of the rotary kiln are influenced.
3) Kiln tail covers and secondary combustion chambers are respectively arranged at the feeding end of the rotary kiln, and the two devices occupy a certain production space, so that a certain difficulty is brought to production and equipment arrangement.
4) And a kiln tail cover and a secondary combustion chamber are arranged at the feeding end of the rotary kiln, and two sets of ash removal devices are required to be arranged for accumulated ash generated by the two devices.
5) And a kiln tail cover and a secondary combustion chamber are arranged at the feeding end of the rotary kiln, so that the flow stroke of smoke is prolonged, the smoke discharging resistance is increased, and the equipment maintenance and operation cost is increased.
Disclosure of utility model
Aiming at the problems existing in the treatment of the flue gas discharged from the traditional direct reduction rotary kiln of iron ore, the utility model provides a direct reduction rotary kiln flue gas treatment device for realizing the standard discharge of the discharged flue gas, reducing the dust content of the flue gas before the combustible components are treated, reducing the ash removal device and shortening the flow stroke of the flue gas.
Therefore, the utility model adopts the following technical scheme:
The feeding end of the rotary kiln is connected with a vertical flue gas treatment chamber, the feeding end of the rotary kiln is flexibly and hermetically connected with the side wall of the flue gas treatment chamber, and the cross section of the flue gas treatment chamber is more than three times of the cross section of a kiln tail cover of the rotary kiln; the feeding pipe of the rotary kiln vertically penetrates downwards from the top of the flue gas treatment chamber and penetrates into the rotary kiln;
The bottom of the flue gas treatment chamber is provided with an ash deposition discharge port, and the top of the flue gas treatment chamber is connected with a smoke exhaust main pipe; the lower part of the flue gas treatment chamber is a gravity sedimentation chamber, the upper part of the flue gas treatment chamber is a combustible component treatment chamber, the gravity sedimentation chamber is used for sedimentation of particulate matters in the flue gas, and the combustible component treatment chamber is used for burning combustible components in the flue gas; a gas supply system is arranged in the combustible component disposal chamber;
In the utility model, the flue gas at 500-600 ℃ discharged from the feeding end of the rotary kiln firstly enters a gravity settling chamber of a flue gas treatment chamber, the flue gas is changed from horizontal flow to bottom-up flow, and coarse particle dust contained in the flue gas is separated from the flue gas under the action of inertia force and gravity in the process of changing the flow direction of the flue gas and is deposited at the bottom of the flue gas treatment chamber. The flue gas after coarse dust removal continuously flows from bottom to top in the flue gas treatment chamber, fine particle dust contained in the flue gas is continuously separated from the flue gas under the action of gravity, and the fine particle dust is also deposited at the bottom of the flue gas treatment chamber. When the flue gas flows into the combustible component disposal chamber, the flue gas is mixed with air sprayed from the air spraying port and burnt, so that the temperature of the flue gas can be increased to 900-1000 ℃, and the high-temperature flue gas is finally discharged from the top of the flue gas disposal chamber.
The utility model improves the dust removal effect of the flue gas in the flue gas treatment chamber, adopts the flue gas treatment chamber with the flue gas flow cross-sectional area more than three times larger than the kiln tail hood cross-sectional area, can effectively reduce the flow velocity of the flue gas in the flue gas treatment chamber, and prolongs the flow time of the flue gas in the flue gas treatment chamber.
According to the utility model, a blower is arranged outside a flue gas disposal chamber, an outlet of the blower is connected with one end of an air main pipe, the other end of the air main pipe is connected with the middle part of an air distribution pipe, the air distribution pipe is vertically arranged, an air spraying pipe is uniformly arranged on the air distribution pipe along the length direction, an adjusting valve is arranged on the air spraying pipe, an air spraying hole is arranged at the other end of the air spraying pipe, the air spraying hole is positioned in the middle part of the flue gas disposal chamber, and air can be uniformly blown into the combustible component disposal chamber along the circumferential direction.
The utility model sets the charging hole on the top of the flue gas disposal room, the lower part of the charging hole is connected with the upper end of the charging pipe, the lower end of the charging pipe is positioned at the bottom of the kiln tail in the rotary kiln; in the part of the feeding pipe in the kiln, the feeding pipe needs to bear the effect of high-temperature radiation, and in order to prolong the service life of the feeding pipe, a refractory castable with the thickness of 30-50mm is arranged outside the pipe wall of the feeding pipe.
In order to clean the combustible components in the flue gas, 8-12 air ejection openings are arranged in the combustible component disposal chamber, and each air ejection opening is arranged along the vertical direction, so that the combustible components in the flue gas can be uniformly mixed with air in the process of flowing the flue gas from bottom to top, the combustible components in the flue gas can be completely combusted, and the standard emission of the flue gas can be achieved.
According to the utility model, the bottom of the flue gas treatment chamber is provided with the dust accumulation bin, and the dust accumulated in the dust accumulation bin is discharged periodically through the dust accumulation discharge port arranged at the bottom after the dust accumulated in the high-temperature flue gas falls into the dust accumulation bin for temporary storage.
The part of the air ejection pipe in the flue gas treatment chamber needs to bear the radiation effect of high-temperature flue gas at 900-1000 ℃, and a layer of refractory castable material with the thickness of 30-50mm is arranged on the outer wall of the part of the air ejection pipe in the flue gas treatment chamber in order to prolong the service life of the flue gas treatment chamber.
The utility model has the beneficial effects that:
1. According to the utility model, a kiln tail cover and a secondary combustion chamber of the existing rotary kiln for directly reducing iron ore are eliminated, and a flue gas treatment chamber is additionally arranged at the feeding end of the rotary kiln, so that the number of production equipment is reduced, and the flow of flue gas production is shortened;
2. In the high-temperature flue gas dust removal process of the rotary kiln, the method of combining air flow disturbance and gravity dust removal is adopted, ash in the flue gas can be treated as clean as possible, and clean flue gas is combusted in a combustible component treatment chamber, so that after dust in the flue gas is prevented from being melted, a liquid phase is adhered to the inner wall of the flue gas treatment chamber, and a production line is enabled to run continuously, stably and smoothly;
3. According to the utility model, the plurality of air ejection ports are arranged in the combustible component disposal chamber of the rotary kiln along the vertical direction, so that the combustible components in the flue gas can be subjected to layered combustion, and the standard emission of the flue gas is realized.
Drawings
FIG. 1 is a diagram of a conventional direct reduction rotary kiln flue gas treatment system;
FIG. 2 is a diagram of a direct reduction rotary kiln flue gas treatment system according to the present utility model;
In the figure: 1-a flue gas treatment chamber, 101-a gravity settling chamber, 102-a combustible component treatment chamber;
2-charging pipes, 3-smoke discharging main pipes, 4-smoke discharging main pipes, 41-blowers, 42-air main pipes, 43-air distributing pipes, 44-adjusting valves and 45-air spraying pipes.
Detailed Description
The utility model is further described with reference to the drawings and the specific embodiments below:
As shown in fig. 2, a feeding end of a rotary kiln is connected with a vertical flue gas treatment chamber 1, the feeding end of the rotary kiln is flexibly and hermetically connected with the side wall of the flue gas treatment chamber 1, and the cross section of the flue gas treatment chamber 1 is more than three times of the cross section of a kiln tail cover of the rotary kiln; the feeding pipe 2 of the rotary kiln vertically penetrates downwards from the top of the flue gas treatment chamber 1 and penetrates into the rotary kiln.
The bottom of the flue gas treatment chamber 1 is provided with an ash deposition discharge port, and the top of the flue gas treatment chamber is connected with a smoke exhaust main pipe 43; the lower part of the flue gas treatment chamber 1 is a gravity settling chamber 101, the upper part is a combustible component treatment chamber 102, the gravity settling chamber 101 is used for settling particulate matters in the flue gas, and the combustible component treatment chamber 102 is used for burning combustible components in the flue gas; an air supply system is disposed in the combustible component treatment chamber 102. The air supply system includes a blower 41, an air main 42, an air distribution pipe 43, and an air ejection pipe 45; the air blower 41 is arranged outside the flue gas treatment chamber 1, the outlet of the air blower 41 is connected with one end of the air main pipe 42, the other end of the air main pipe 42 is connected with the middle part of the air distribution pipe 43, the air distribution pipe 43 is vertically arranged, and the air distribution pipe 43 is uniformly provided with air ejection pipes 45 along the length direction; the air discharge pipe 45 horizontally penetrates into the combustible component treatment chamber 102, the air discharge port is located in the middle of the combustible component treatment chamber 102, the air discharge pipe 45 is provided with the regulating valve 44, and the other end of the air discharge pipe 45 is provided with the air discharge port, so that air can be uniformly blown into the combustible component treatment chamber 102 along the circumferential direction.
1) The flue gas treatment system of the direct reduction rotary kiln for the iron ore mainly comprises an air supply system, a flue gas treatment chamber 1, a feeding system and a flue gas main pipe. The air supply system consists of an air blower 41, an air main pipe 42, an air distribution pipe 43, a regulating valve 44, an air spraying pipe 45 and an air spraying port; the flue gas treatment chamber 1 consists of a gravity settling chamber 101, a combustible component treatment chamber 102, a sealing device, a smoke outlet, an ash deposition discharge port and ash deposition; the charging system consists of a charging port, a charging pipe 2 and refractory materials.
2) The flue gas at 500-600 ℃ discharged from the feeding end of the rotary kiln firstly enters the gravity settling chamber 101 of the flue gas treatment chamber 1, the flue gas is changed from horizontal flow to bottom-up flow, and coarse particle dust contained in the flue gas is separated from the flue gas under the action of inertia force and gravity in the process of changing the flow direction of the flue gas and is deposited at the bottom of the flue gas treatment chamber 1. The flue gas after coarse dust removal continuously flows from bottom to top in the flue gas treatment chamber 1, fine particle dust contained in the flue gas is continuously separated from the flue gas under the action of gravity, and the fine particle dust is also deposited at the bottom of the flue gas treatment chamber 1. When the flue gas flows into the combustible component treatment chamber 102, the flue gas is mixed with air sprayed from the air spraying port and combusted, so that the temperature of the flue gas can be increased to 900-1000 ℃, and the high-temperature flue gas is finally discharged from the top of the flue gas treatment chamber 1.
3) In the flue gas treatment chamber 1, the flue gas treatment chamber 1 with the flue gas flow cross-sectional area being more than 3 times larger than that of the existing kiln tail hood is adopted, so that the flow velocity of the flue gas in the flue gas treatment chamber 1 can be reduced, and the flow time of the flue gas in the flue gas treatment chamber 1 can be prolonged.
4) The flue gas treatment chamber 1 is externally provided with a blower 41, an outlet of the blower 41 is connected with one end of an air main pipe 42, the other end of the air main pipe 42 is connected with the middle part of an air distribution pipe 43, the air distribution pipe 43 is vertically installed, an air spraying pipe 45 is uniformly installed on the air distribution pipe 43 along the length direction, an adjusting valve 44 is installed on the air spraying pipe 45, an air spraying outlet is arranged at the other end of the air spraying pipe 45, the air spraying outlet is positioned in the middle part of the flue gas treatment chamber 1, and air can be uniformly blown into the combustible component treatment chamber 102 along the circumferential direction.
5) In the flue gas treatment chamber 1, a feed inlet is arranged at the top of the flue gas treatment chamber 1, the lower part of the feed inlet is connected with the upper end of a feed pipe 2, and the lower end of the feed pipe 2 is positioned at the bottom of the kiln tail in the rotary kiln; the part of the charging pipe 2 located in the kiln is provided with a refractory castable with a thickness of 40mm outside the pipe wall of the charging pipe 2.
6) 10 Air ejection openings are arranged in the combustible component treatment chamber 102, and each air ejection opening is arranged in the vertical direction, so that the combustible components in the flue gas can be uniformly mixed with air in the process of flowing the flue gas from bottom to top, and the combustible components in the flue gas can be completely combusted.
7) The bottom of the flue gas treatment chamber 1 is provided with an ash deposition bin, deposited ash deposited from high-temperature flue gas falls into the ash deposition bin for temporary storage, and the deposited ash in the ash deposition bin is periodically discharged through an ash deposition discharge port arranged at the bottom.
8) The air outlet pipe 45 is located in the flue gas treatment chamber 1, and a layer of 50mm refractory castable is arranged on the outer wall of the air outlet pipe.
Claims (5)
1. The direct reduction rotary kiln flue gas treatment device is characterized in that a feeding end of a rotary kiln is connected with a vertical flue gas treatment chamber (1), the feeding end of the rotary kiln is flexibly and hermetically connected with the side wall of the flue gas treatment chamber (1), and the cross section of the flue gas treatment chamber (1) is more than three times of the cross section of a kiln tail cover of the rotary kiln; the feeding pipe (2) of the rotary kiln vertically penetrates downwards from the top of the flue gas treatment chamber (1) and penetrates into the rotary kiln;
the bottom of the flue gas treatment chamber (1) is provided with an ash deposition discharge port, and the top of the flue gas treatment chamber is connected with a flue gas main pipe (3); the lower part of the flue gas treatment chamber (1) is a gravity sedimentation chamber (101), the upper part of the flue gas treatment chamber is a combustible component treatment chamber (102), the gravity sedimentation chamber (101) is used for sedimentation of particulate matters in flue gas, and the combustible component treatment chamber (102) is used for combustion of combustible components in flue gas; an air supply system is arranged in the combustible component treatment chamber (102).
2. The direct reduction rotary kiln flue gas treatment device according to claim 1, characterized in that the air supply system comprises a blower (41), an air main (42), an air distribution pipe (43) and an air ejection pipe (45);
The air blower (41) is arranged at the outer side of the flue gas treatment chamber (1), an outlet of the air blower (41) is connected with one end of the air main pipe (42), the other end of the air main pipe (42) is connected with the middle part of the air distribution pipe (43), the air distribution pipe (43) is vertically arranged, and the air spraying pipes (45) are uniformly arranged on the air distribution pipe (43) along the length direction; the air injection pipe (45) horizontally penetrates into the combustible component treatment chamber (102), the air injection port is positioned in the middle of the combustible component treatment chamber (102), the air injection pipe (45) is provided with the regulating valve (44), and the other end of the air injection pipe (45) is provided with the air injection port, so that air can be uniformly injected into the combustible component treatment chamber (102) along the circumferential direction.
3. The direct reduction rotary kiln flue gas treatment device according to claim 1, wherein a feed port of the feed pipe (2) is arranged at the top of the flue gas treatment chamber (1), the lower part of the feed port is connected with the upper end of the feed pipe (2), and the lower end of the feed pipe (2) is positioned at the bottom of the kiln tail in the rotary kiln; the part of the feeding pipe (2) positioned in the kiln is provided with refractory castable with the thickness of 30-50mm at the outer part of the pipe wall.
4. The direct reduction rotary kiln flue gas treatment device according to claim 1, wherein 8-12 air ejection openings are arranged in the combustible component treatment chamber (102), each air ejection opening is arranged in the vertical direction, and the combustible component in the flue gas can be fully and uniformly mixed with air in the process of flowing the flue gas from bottom to top, so that the combustible component in the flue gas can be fully combusted.
5. The direct reduction rotary kiln flue gas treatment device according to claim 1, characterized in that the part of the air injection pipe (45) located in the flue gas treatment chamber (1) is provided with a layer of 30-50mm refractory castable on the outer wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323241937.1U CN221376338U (en) | 2023-11-30 | 2023-11-30 | Direct reduction rotary kiln flue gas treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323241937.1U CN221376338U (en) | 2023-11-30 | 2023-11-30 | Direct reduction rotary kiln flue gas treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221376338U true CN221376338U (en) | 2024-07-19 |
Family
ID=91861200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323241937.1U Active CN221376338U (en) | 2023-11-30 | 2023-11-30 | Direct reduction rotary kiln flue gas treatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221376338U (en) |
-
2023
- 2023-11-30 CN CN202323241937.1U patent/CN221376338U/en active Active
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