CN113865336A - Waste heat recovery device for cooling sinter by rotary kiln - Google Patents
Waste heat recovery device for cooling sinter by rotary kiln Download PDFInfo
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- CN113865336A CN113865336A CN202111005251.5A CN202111005251A CN113865336A CN 113865336 A CN113865336 A CN 113865336A CN 202111005251 A CN202111005251 A CN 202111005251A CN 113865336 A CN113865336 A CN 113865336A
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- Prior art keywords
- waste heat
- rotary kiln
- heat recovery
- blanking
- smoke hood
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
- F27B7/38—Arrangements of cooling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/10—Arrangements for using waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/20—Arrangements for treatment or cleaning of waste gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
本发明公开了一种用回转窑冷却烧结矿的余热回收装置，包括烧结机、落料烟罩、冷却机构、余热回收装置、排料烟罩及输送装置；落料烟罩的进料口与烧结机的出料端相连，落料烟罩的出料口与冷却机构相连，落料烟罩的顶部出气口与余热回收装置相连通，余热回收装置排气端通过循环风机与冷却机构相连；本专利通过采用封闭的回转窑进行烧结矿的冷却，换热后的热空气温度超过500℃，大大提高余热回收效率，且经余热回收机构回收热量后的热空气，仍可通过循环风机重新送入回转窑对烧结矿进行冷却，可以进一步提高余热回收效率。
The invention discloses a waste heat recovery device for cooling sintered ore by a rotary kiln, comprising a sintering machine, a blanking fume hood, a cooling mechanism, a waste heat recovery device, a discharging fume hood and a conveying device; The discharge end of the sintering machine is connected, the discharge port of the blanking fume hood is connected with the cooling mechanism, the top air outlet of the blanking fume hood is connected with the waste heat recovery device, and the exhaust end of the waste heat recovery device is connected with the cooling mechanism through a circulating fan; In this patent, a closed rotary kiln is used to cool the sintered ore, and the temperature of the hot air after heat exchange exceeds 500 °C, which greatly improves the efficiency of waste heat recovery, and the hot air after the heat is recovered by the waste heat recovery mechanism can still be sent through the circulating fan. The sintered ore is cooled by entering the rotary kiln, which can further improve the efficiency of waste heat recovery.
Description
Technical Field
The invention relates to the technical field of sinter cooling and waste heat utilization, in particular to a waste heat recovery device for cooling sinter by using a rotary kiln.
Background
The energy consumption of the industrial field in China accounts for about 70% of the total energy consumption of China, the unit energy consumption of main industrial products is higher than the international advanced level by about 30% on average, and the low utilization rate of industrial waste heat is an important reason for high energy consumption. In the production process of steel, the energy consumption of the sintering process accounts for about 15% of the total energy consumption, the sintering process is second only to the iron-making process, and the sintering energy conservation plays an important role in energy conservation of steel enterprises. In the sintering process, the heat sintering ore accounts for more than 40% of the total heat consumption, and the full utilization of the part of waste heat is the key point of sintering energy conservation. At present, the ring-type cooler or the belt cooler is mainly adopted for cooling the domestic sinter, and the sensible heat recovery and the utilization of the sinter are also carried out on the basis, so that the prior sinter cooling process has the following problems when the waste heat is utilized: firstly, the problem of air leakage of the system cannot be eliminated, the air leakage is gradually worsened, and the waste heat utilization efficiency is quickly reduced; secondly, the flue gas temperature is low (generally 300-400 ℃), and the waste heat utilization efficiency is low; the resistance of the material layer is large, the power consumption of the cooling fan is high, and the benefit of the waste heat power generation system is not obvious. Therefore, the existing cooling process of the sinter is optimized and perfected, the inherent problem of utilization of sintering waste heat is solved, and the method has important significance for reducing energy consumption in the sintering process and improving the benefit and competitiveness of iron and steel enterprises.
Disclosure of Invention
In order to solve the bottleneck of the prior art, the invention provides a waste heat recovery device for cooling sintered ores by a rotary kiln, the sintered ores are cooled by the closed rotary kiln, the temperature of hot air after heat exchange exceeds 500 ℃, the waste heat recovery efficiency is greatly improved, and the hot air after heat recovery by a waste heat recovery mechanism can be sent into the rotary kiln again to cool the sintered ores by a circulating fan, so that the waste heat recovery efficiency can be further improved.
The technical scheme adopted by the invention is as follows: a waste heat recovery device for cooling sintered ore by a rotary kiln comprises a sintering machine, a blanking smoke hood, a cooling mechanism, a waste heat recovery device, a discharging smoke hood and a conveying device;
a feeding hole of the blanking smoke hood is connected with a discharging end of the sintering machine, a discharging hole of the blanking smoke hood is connected with the cooling mechanism, a gas outlet at the top of the blanking smoke hood is communicated with a waste heat recovery device, and an exhaust end of the waste heat recovery device is connected with the cooling mechanism through a circulating fan;
an air outlet at the top of the blanking smoke hood is communicated with a waste heat recovery device through an exhaust pipe, and the exhaust pipe is connected with the sintering machine through a connecting pipe;
the cooling mechanism is a rotary kiln, the rotary kiln is obliquely arranged between the blanking smoke hood and the discharge smoke hood, one end of the rotary kiln is connected with the blanking smoke hood, the other end of the rotary kiln is connected with the discharge smoke hood, and the discharge smoke hood is arranged right above the feeding end of the conveying device;
the waste heat recovery device comprises a dust removal device and a waste heat recovery mechanism, the air inlet end of the dust removal device is connected with the exhaust pipe, the air outlet end of the dust removal device is connected with the air inlet end of the waste heat recovery mechanism, the air outlet end of the waste heat recovery mechanism is connected with the input end of the circulating fan through the inlet pipe, and the output end of the circulating fan is communicated with the rotary kiln through the outlet pipe.
Further, the inside broken subassembly that is provided with of blanking petticoat pipe, this broken subassembly be two crushing rollers that can roll that correspond the setting, and this broken subassembly sets up directly over blanking petticoat pipe bottom discharge mouth.
Further, the exhaust pipe is connected with the sintering machine through a connecting pipe; one end of the connecting pipe is communicated with the exhaust pipe, and the other end of the connecting pipe is communicated with a hot air cover arranged above the sintering machine.
Furthermore, the highest end of the rotary kiln is communicated with a discharge hole at the bottom of the blanking smoke hood, and the lowest end of the rotary kiln is communicated with a feed hole of the discharge smoke hood.
Further, the inclination of rotary kiln is 1~ 10.
Furthermore, an air supplementing opening is arranged on the inlet pipe.
Furthermore, an air outlet is arranged on the outlet pipe, and one end of the outlet pipe, which is far away from the circulating fan, is communicated with the lowest end of the rotary kiln.
Has the advantages that:
the invention has the following beneficial effects:
1. the method adopts the closed rotary kiln to cool the sinter, the sealing problem is basically solved, and the dust pollution problem is basically eliminated;
2. the sintered ore of the patent automatically moves forwards in the rotary kiln by means of gravity and the rotation of the kiln, and the conveying power consumption is slightly reduced;
3. the sintered ore of the rotary kiln is turned over along with the rotation of the cylinder body in the rotary kiln all the time, and is in a disturbance state with cooling air all the time, the heat exchange between the sintered ore and the cooling air is strong, and the cooling effect of the sintered ore is greatly improved;
4. the temperature of the cooling air in the rotary kiln is higher (can reach more than 500 ℃) with the hot air after heat exchange with the sinter, so that the waste heat recovery efficiency is greatly improved; the resistance of the cooling air in the kiln cylinder of the rotary kiln is relatively small;
5. the hot air after the heat is recovered by the waste heat recovery mechanism can be sent into the rotary kiln again through the circulating fan to cool the sinter, so that the waste heat recovery efficiency can be further improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the device comprises graphic marks, 1, a sintering machine, 2, sintered ores, 3, a blanking smoke hood, 31, an exhaust pipe, 4, a crushing assembly, 5, a rotary kiln, 6, a discharging smoke hood, 7, a conveying device, 8, a dust removing device, 9, a waste heat recovery mechanism, 10, a circulating fan, 11, a connecting pipe, 12, a hot air hood, 13, an air supplementing opening, 131, an inlet pipe, 14, an air discharging opening, 141 and an outlet pipe.
Detailed Description
The present invention will be described in further detail with reference to the following figures and specific examples, which should not be construed as limiting the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "lateral", "longitudinal", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
A waste heat recovery device for cooling sinter by a rotary kiln comprises a sintering machine 1, a blanking smoke hood 3, a cooling mechanism, a waste heat recovery device, a discharging smoke hood 6 and a conveying device 7; the conveying device in this patent may be a belt for conveying material;
a feeding hole of the blanking smoke cover 3 is connected with a discharging end of the sintering machine 1, a discharging hole of the blanking smoke cover 3 is connected with the cooling mechanism, a gas outlet at the top of the blanking smoke cover 3 is communicated with a waste heat recovery device, and an exhaust end of the waste heat recovery device is connected with the cooling mechanism through a circulating fan 10;
an air outlet at the top of the blanking smoke hood 3 is communicated with a waste heat recovery device through an exhaust pipe 31, and the exhaust pipe 31 is connected with the sintering machine 1 through a connecting pipe 11; a crushing assembly 4 is arranged in the blanking smoke cover 3, the crushing assembly 4 is two crushing rollers which are correspondingly arranged and can roll, and the crushing assembly 4 is arranged right above a discharge port at the bottom of the blanking smoke cover 3; the exhaust pipe 31 is connected to the sintering machine 1 through a connecting pipe 11; one end of the connection pipe 11 is communicated with the exhaust pipe 31, and the other end of the connection pipe 11 is communicated with the hot air hood 12 provided above the sintering machine 1
The cooling mechanism is a rotary kiln 5, a kiln cylinder body of the rotary kiln 5 is driven by a driving device to rotate, the driving device is a device which is common in the prior art, and the detailed description is not provided in the patent; the rotary kiln 5 is obliquely arranged between the blanking smoke hood 3 and the discharge smoke hood 6, one end of the rotary kiln 5 is connected with the blanking smoke hood 3, the other end of the rotary kiln 5 is connected with the discharge smoke hood 6, and the discharge smoke hood 6 is arranged right above the feeding end of the conveying device 7; the highest end of the rotary kiln 5 is communicated with a discharge hole at the bottom of the blanking smoke hood 3, and the lowest end of the rotary kiln 5 is communicated with a feed hole of the discharge smoke hood 6; the inclination of the rotary kiln 5 is 1-10 degrees. The rotary kiln in this patent refers to the kiln barrel portion of the rotary kiln.
The waste heat recovery device comprises a dust removal device 8 and a waste heat recovery mechanism 9, and the dust removal device is used for removing dust particles carried in air flow and reducing abrasion to waste heat recovery equipment and a circulating fan; as long as the dust removing device capable of filtering dust particles in the air flow can meet the requirements of the dust removing device in the patent document, the dust removing device can be a filter screen for filtering particles, and the structure of the dust removing device is not explained in detail;
the inlet end of the dust removing device 8 is connected with the exhaust pipe 31, the exhaust end of the dust removing device 8 is connected with the inlet end of the waste heat recovery mechanism 9, the exhaust end of the waste heat recovery mechanism 9 is connected with the input end of the circulating fan 10 through the inlet pipe 131, and the output end of the circulating fan 10 is communicated with the rotary kiln 5 through the outlet pipe 141. The circulating fan 10 can send the hot air after the waste heat recovery to the rotary kiln again for cyclic utilization;
the inlet pipe 131 is provided with an air supplement port 13; an air outlet 14 is arranged on the outlet pipe 141, and one end of the outlet pipe 141, which is far away from the circulating fan 10, is communicated with the lowest end of the rotary kiln 5; the air quantity and the temperature of the system can be adjusted by arranging the air supplementing opening and the air discharging opening and matching the opening and the closing of the air supplementing opening and the air discharging opening.
The rotary kiln is adopted to cool the sinter 2, the highest end of the rotary kiln is provided with the discharge smoke hood, the sinter can be collected and then discharged, and meanwhile, the discharged dust can be collected;
a blanking smoke hood is arranged at the lowest end of the rotary kiln, so that the sintered ore is collected and crushed, and hot air after heat exchange can be collected; the sinter falls from the highest end of the rotary kiln and is discharged from the lowest end of the rotary kiln, cooling air is fed from the lowest end and is discharged from the highest end, and the two are subjected to countercurrent heat exchange, so that the temperature of hot air after heat exchange is improved, and the temperature exceeds 500 ℃;
a dust removal device 8 is arranged in front of the waste heat recovery mechanism, so that dust particles carried in the air flow can be removed, and the abrasion to the waste heat recovery mechanism and the circulating fan is reduced;
the sintering machine and the rotary kiln are all devices commonly used in related industries, and the specific structures of the two devices are not explained one by one; the waste heat recovery mechanism in this patent can be for the device that directly utilizes high temperature section hot-air to heat, also can be for converting high temperature section hot-air with heat storage's middle energy memory, and this paper does not prescribe a limit to waste heat recovery mechanism's concrete structure, as long as can reach foretell functional requirement or can process all devices that utilize high temperature section hot-air can all be waste heat recovery mechanism in this patent.
The specific work flow of this patent does: the method comprises the following steps that (1) the sintering ore 2 with the temperature of 700-800 ℃ from a sintering machine 1 falls into a blanking smoke hood 3, is crushed by a crushing assembly 4 arranged in the blanking smoke hood 3 and then enters the highest end of a rotary kiln 5, the rotary kiln rotates while driving the sintering ore to move to the lowest end of the rotary kiln 5, and the sintering ore finally falls into a discharging smoke hood 6 and is conveyed to the next process through a conveying device 7 after being discharged;
the hot gas recovery process in the whole process comprises the following steps: the hot air collected by the blanking smoke hood 3 is partially sent to a hot air hood 12 of the sintering machine through a hot air connecting pipe 11, most of the hot air is sent to the dust removing equipment 8 through an exhaust pipe 31 to remove dust particles, then enters the waste heat recovery mechanism 9, the hot air after heat exchange is pressurized by the circulating fan 10 and then is sent to a cooling air inlet of the rotary kiln 5 again to participate in circulating heat exchange, an air supplementing opening 13 is arranged on an inlet pipe 131 of the circulating fan 10, an air placing opening 14 is arranged on an outlet pipe 141 of the circulating fan 10, and the hot air and the air supplementing opening jointly adjust the circulating air temperature and the flow of the system.
The design idea of the invention is as follows: high-temperature sintering ore discharged from the sintering machine is crushed by a crushing assembly in a blanking smoke hood and then falls into a feeding hole at the highest end of the rotary kiln; the rotary kiln has a certain inclination angle and is driven to rotate by a driving device; the high-temperature sintered ore gradually moves to the lowest end along an inclined angle along with the rotation of the rotary kiln; the sintered ore is subjected to countercurrent heat exchange with cooling air fed from the highest end in the moving process, and finally the high-temperature sintered ore is cooled to be below 150 ℃, falls down through a discharge smoke hood and is conveyed to the next process by a conveying device; cooling air is sent into a cold air inlet at the lowest end of the rotary kiln through a fan, moves to the highest end of the rotary kiln, performs countercurrent heat exchange with sinter, is heated to a temperature of over 500 ℃ finally, is collected by a tail blanking smoke hood, and enters a waste heat recovery mechanism to recover waste heat after dust particles are removed by a dust collecting device; after heat exchange, hot air with a certain temperature is still present and is pressurized by the circulating fan and then sent into the rotary kiln again to participate in circulation. By adopting the cooling device, the sintering ore can be effectively cooled, the sealing problem of the existing sintering ore cooling process can be fundamentally eliminated, the field operation environment is obviously improved, and the waste heat flue gas temperature is increased, so that the waste heat utilization efficiency is greatly improved.
The device of the present invention may have other forms than the above-described embodiments, and it should be understood that any simple modification, equivalent change and modification made to the above-described embodiments according to the technical spirit of the present invention fall within the scope of the present invention.
Claims (7)
1. The utility model provides a waste heat recovery device with rotary kiln cooling sintering deposit which characterized in that: the device comprises a sintering machine, a blanking smoke hood, a cooling mechanism, a waste heat recovery device, a discharging smoke hood and a conveying device;
a feeding hole of the blanking smoke hood is connected with a discharging end of the sintering machine, a discharging hole of the blanking smoke hood is connected with the cooling mechanism, a gas outlet at the top of the blanking smoke hood is communicated with a waste heat recovery device, and an exhaust end of the waste heat recovery device is connected with the cooling mechanism through a circulating fan;
an air outlet at the top of the blanking smoke hood is communicated with a waste heat recovery device through an exhaust pipe, and the exhaust pipe is connected with the sintering machine through a connecting pipe;
the cooling mechanism is a rotary kiln, the rotary kiln is obliquely arranged between the blanking smoke hood and the discharge smoke hood, one end of the rotary kiln is connected with the blanking smoke hood, the other end of the rotary kiln is connected with the discharge smoke hood, and the discharge smoke hood is arranged right above the feeding end of the conveying device;
the waste heat recovery device comprises a dust removal device and a waste heat recovery mechanism, the air inlet end of the dust removal device is connected with the exhaust pipe, the air outlet end of the dust removal device is connected with the air inlet end of the waste heat recovery mechanism, the air outlet end of the waste heat recovery mechanism is connected with the input end of the circulating fan through the inlet pipe, and the output end of the circulating fan is communicated with the rotary kiln through the outlet pipe.
2. The apparatus for recovering waste heat from a rotary kiln for cooling sintered ore according to claim 1, wherein: the inside broken subassembly that is provided with of blanking petticoat pipe, this broken subassembly be two crushing rollers that can roll that correspond the setting, and this broken subassembly setting is directly over blanking petticoat pipe bottom discharge mouth.
3. The apparatus for recovering waste heat from a rotary kiln for cooling sintered ore according to claim 1, wherein: the exhaust pipe is connected with the sintering machine through a connecting pipe; one end of the connecting pipe is communicated with the exhaust pipe, and the other end of the connecting pipe is communicated with a hot air cover arranged above the sintering machine.
4. The apparatus for recovering waste heat from a rotary kiln for cooling sintered ore according to claim 1, wherein: the highest end of the rotary kiln is communicated with a discharge hole at the bottom of the blanking smoke hood, and the lowest end of the rotary kiln is communicated with a feed hole of the discharge smoke hood.
5. The apparatus for recovering waste heat from a rotary kiln for cooling sintered ore according to claim 1, wherein: the inclination of rotary kiln is 1~ 10.
6. The apparatus for recovering waste heat from a rotary kiln for cooling sintered ore according to claim 1, wherein: an air supply opening is arranged on the inlet pipe.
7. The apparatus for recovering waste heat from a rotary kiln for cooling sintered ore according to claim 1, wherein: an air outlet is arranged on the outlet pipe, and one end of the outlet pipe, which is far away from the circulating fan, is communicated with the lowest end of the rotary kiln.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111005251.5A CN113865336B (en) | 2021-08-30 | 2021-08-30 | Waste heat recovery device for cooling sinter by rotary kiln |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111005251.5A CN113865336B (en) | 2021-08-30 | 2021-08-30 | Waste heat recovery device for cooling sinter by rotary kiln |
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| CN113865336B CN113865336B (en) | 2024-07-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115265173A (en) * | 2022-06-15 | 2022-11-01 | 佛山市天禄智能装备科技有限公司 | Rotary kiln with cold air circulation system |
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| CN101949650A (en) * | 2010-09-25 | 2011-01-19 | 中冶长天国际工程有限责任公司 | Method for treating smoke generated by sintering ore materials |
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| US20180112916A1 (en) * | 2015-04-03 | 2018-04-26 | Shijiazhuang Xinhua Energy Environmental Technolgy Co., Ltd | Dividing-wall rotary kiln apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115265173A (en) * | 2022-06-15 | 2022-11-01 | 佛山市天禄智能装备科技有限公司 | Rotary kiln with cold air circulation system |
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