CN113251810A - Metallurgical dust rotary kiln sediment waste heat transfer device - Google Patents
Metallurgical dust rotary kiln sediment waste heat transfer device Download PDFInfo
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- CN113251810A CN113251810A CN202110460269.8A CN202110460269A CN113251810A CN 113251810 A CN113251810 A CN 113251810A CN 202110460269 A CN202110460269 A CN 202110460269A CN 113251810 A CN113251810 A CN 113251810A
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- heat exchange
- rotary kiln
- exchange device
- kiln
- slag
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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
- F27D17/004—Systems for reclaiming 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
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases, or liquids
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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
- F27D9/00—Cooling of furnaces or of charges therein
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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)
- Muffle Furnaces And Rotary Kilns (AREA)
- Furnace Details (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of comprehensive utilization of resources and energy conservation and emission reduction, in particular to a metallurgical dust rotary kiln slag waste heat exchange device which comprises a rotary kiln and a kiln slag heat exchange device, wherein a conveyor is installed at the bottom of the rotary kiln, the tail end of the conveyor is positioned above a feed inlet of the kiln slag heat exchange device, one side of the kiln slag heat exchange device is communicated with a nitrogen-air heat exchanger, air is introduced into the bottom of the nitrogen-air heat exchanger, high-temperature air in the nitrogen-air heat exchanger flows to a rotary kiln blast pipe, the rotary kiln blast pipe is installed on the rotary kiln, the kiln slag heat exchange device comprises a machine body shell, a vibrating screen, a large hopper, a vibrating feeder and a dust collecting chamber, the large hopper is installed at the top of the machine body shell, and the vibrating screen is installed above the large hopper. The invention can reduce the energy consumption of the zinc and iron rich process for extracting the metallurgical dust, prevent the iron rich kiln slag from being oxidized, improve the iron-containing grade of the kiln slag, prevent the iron rich kiln slag from being directly contacted with water and avoid the occurrence of safety production accidents.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of resources and energy conservation and emission reduction, in particular to a waste heat exchange device for a rotary kiln slag of metallurgical dust.
Background
The metallurgical dust is from various working procedures of steel smelting, and mainly comprises the working procedures of sintering, blast furnace, converter, electric furnace, steel rolling and the like. The metallurgical dust generation amount is about 8% -12% of the steel yield, the crude steel yield in China in 2019 is 9.96 hundred million t, and the dust generation amount exceeds 9000 million t. The main process of the resource treatment of the metallurgical dust is a rotary kiln zinc extraction and iron enrichment process, wherein the metallurgical dust is smelted by a rotary kiln to generate a large amount of kiln slag, and no related equipment or process is used for carrying out waste heat recovery and resource utilization on the kiln slag with high yield, high temperature and high iron content grade at the present stage, so that the current mainstream process generates a large amount of smoke dust to pollute the environment, wastes a large amount of waste heat resources, causes safety production accidents and affects the high value-added utilization of the metallurgical dust kiln slag.
At present, metallurgical dust treatment enterprises mainly have a water quenching process and a dry process for treating high-temperature iron-rich kiln slag, wherein the water quenching process mainly utilizes water to cool the high-temperature kiln slag, so that not only is sensible heat of the kiln slag wasted, but also the high-temperature iron-rich material can generate explosion danger when meeting water. The dry process mainly stacks the kiln slag to naturally cool the kiln slag, waste heat cannot be effectively recovered in the cooling process, a large amount of smoke and dust pollutant environment is generated, and meanwhile, the iron-containing taste of the kiln slag is reduced along with the progress of oxidation reaction, so that the added value of the resource utilization of metallurgical dust is influenced.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a waste heat exchange device for metallurgical dust rotary kiln slag.
In order to achieve the purpose, the invention adopts the following technical scheme:
a waste heat exchange device for metallurgical dust rotary kiln slag comprises a rotary kiln and a kiln slag heat exchange device, wherein a conveyor is installed at the bottom of the rotary kiln, the tail end of the conveyor is positioned above a feed inlet of the kiln slag heat exchange device, one side of the kiln slag heat exchange device is communicated with a nitrogen-air heat exchanger, air is introduced into the bottom of the nitrogen-air heat exchanger, high-temperature air in the nitrogen-air heat exchanger flows to a rotary kiln blast pipe, and the rotary kiln blast pipe is installed on the rotary kiln;
kiln sediment heat transfer device includes the organism shell, the sieve that shakes, big hopper, vibratory feeder and dust collecting chamber, big hopper is installed at the top of organism shell, the sieve that shakes is installed in the oblique top department of big hopper, be equipped with circulation high temperature nitrogen pipeline and circulative cooling nitrogen pipeline in the organism shell respectively, the tripper is installed to the top of circulation high temperature nitrogen pipeline, the both sides of tripper are provided with left hopper apron and right hopper apron respectively, be the heat transfer chamber in the middle of circulation high temperature nitrogen pipeline and the circulative cooling nitrogen pipeline, vibratory feeder installs in the exit end below of organism shell, and the dust collecting chamber is linked together with vibratory feeder's bottom.
Preferably, a circulating cooling nitrogen gas inlet hole is formed in the side wall, close to the bottom, of the kiln slag heat exchange device, the circulating cooling nitrogen gas inlet hole is connected with a gas inlet of a circulating cooling nitrogen pipeline, and multiple groups of circulating cooling nitrogen gas exhaust holes are formed in the wall of the circulating cooling nitrogen pipeline.
Preferably, a circulating high-temperature nitrogen gas outlet hole is formed in the side wall, close to the top, of the kiln slag heat exchange device, the circulating high-temperature nitrogen gas outlet hole is connected with a gas outlet of a circulating high-temperature nitrogen pipeline, and multiple groups of circulating high-temperature nitrogen gas exhaust holes are formed in the pipe wall of the circulating high-temperature nitrogen pipeline.
Preferably, the circulating high-temperature nitrogen pipeline and the circulating cooling nitrogen pipeline are both in an annular structure.
Preferably, the nitrogen-air heat exchanger is provided with a high-temperature air exhaust hole for high-temperature air to overflow.
Preferably, the bottom of the vibrating screen is provided with a powder pipeline, and the powder pipeline is opposite to the large hopper.
Preferably, a large hopper cover plate is installed at the position, close to the machine body shell, of the large hopper.
The invention has the beneficial effects that:
according to the invention, the high-temperature waste heat resource of the kiln slag is recovered and is applied to the rotary kiln smelting again, so that the energy consumption of the process for extracting zinc and iron from metallurgical dust is reduced; in addition, nitrogen is used as a heat exchange medium, so that the operation condition of workers is improved, the iron-rich kiln slag can be prevented from being oxidized, the iron-containing grade of the kiln slag is improved, the high value-added utilization of metallurgical dust is realized, the iron-rich kiln slag can be prevented from being directly contacted with water, and the occurrence of safety production accidents is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a slag waste heat exchange device of a metallurgical dust rotary kiln provided by the invention;
FIG. 2 is a schematic structural view of a kiln slag heat exchange device of the metallurgical dust rotary kiln slag waste heat exchange device provided by the invention;
FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic cross-sectional view B-B of FIG. 2.
In the figure: the device comprises a rotary kiln 1, high-temperature iron-rich kiln slag 2, a conveyor 3, a kiln slag heat exchange device 4, a nitrogen-air heat exchanger 5, a circulating cooling nitrogen gas inlet hole 6, a circulating high-temperature nitrogen gas outlet hole 7, air 8, high-temperature air outlet hole 9, a rotary kiln blast pipe 10, a vibrating screen 11, a powder pipeline 12, a large hopper 13, a large hopper cover plate 14, a distributor 15, a left hopper cover plate 16, a right hopper cover plate 17, a circulating high-temperature nitrogen gas pipeline 18, a circulating high-temperature nitrogen gas inlet hole 19, a circulating cooling nitrogen gas pipeline 20, a circulating cooling nitrogen gas outlet hole 21, a vibration feeder 22, iron-rich kiln slag 23 and a dust collecting chamber 24.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-4, a metallurgical dust rotary kiln slag waste heat exchange device comprises a rotary kiln 1 and a kiln slag heat exchange device 4, wherein a conveyor 3 is installed at the bottom of the rotary kiln 1, high-temperature iron-rich kiln slag 2 is produced in the rotary kiln 1, the tail end of the conveyor 3 is positioned above a feed inlet of the kiln slag heat exchange device 4, one side of the kiln slag heat exchange device 4 is communicated with a nitrogen-air heat exchanger 5, the nitrogen-air heat exchanger 5 is used for heating air 8, air 8 is introduced into the bottom of the nitrogen-air heat exchanger 5, a high-temperature air exhaust hole 9 which allows high-temperature air to overflow is formed in the nitrogen-air heat exchanger 5, the high-temperature air exhaust hole 9 is used for conveying the heated high-temperature air back into the rotary kiln 1, and the high-temperature air in the nitrogen-air heat exchanger 5 flows to a rotary kiln blast pipe 10 through the high-temperature air exhaust hole 9, the rotary kiln blast pipe 10 is arranged on the rotary kiln 1;
further, the kiln slag heat exchange device 4 comprises a machine body shell, a vibrating screen 11, a large hopper 13, a vibrating feeder 22 and a dust collecting chamber 24, wherein the large hopper 13 is installed at the top of the machine body shell, a large hopper cover plate 14 is installed at a position, close to the machine body shell, of the large hopper 13, the large hopper cover plate 14 can effectively control blanking of the large hopper 13, the vibrating screen 11 is installed at the obliquely upper position of the large hopper 13, a powder pipeline 12 is arranged at the bottom of the vibrating screen 11, the powder pipeline 12 is used for collecting fine-grained high-temperature iron-rich kiln slag 2, the powder pipeline 12 and the large hopper 13 are arranged oppositely, a circulating high-temperature nitrogen pipeline 18 and a circulating cooling nitrogen pipeline 20 are respectively arranged in the machine body shell, and the circulating high-temperature nitrogen pipeline 18 and the circulating cooling nitrogen pipeline 20 are both in an annular structure;
furthermore, a distributor 15 is arranged above the circulating high-temperature nitrogen pipeline 18, the distributor 15 can effectively sieve the high-temperature iron-rich kiln slag 2, the distributor 15 is positioned in a material waiting bin, the material waiting bin is an area above the circulating high-temperature nitrogen pipeline 18 in the machine body shell, a left hopper cover plate 16 and a right hopper cover plate 17 are respectively arranged on two sides of the distributor 15, a heat exchange chamber is arranged between the circulating high-temperature nitrogen pipeline 18 and the circulating cooling nitrogen pipeline 20, a vibration feeder 22 is arranged below the outlet end of the machine body shell, a dust collection chamber 24 is communicated with the bottom of the vibration feeder 22, and the dust collection chamber 24 is used for recovering the fine-grained iron-rich kiln slag 2 after heat exchange and producing the cooled iron-rich slag 23 after passing through the vibration feeder 22;
further, a circulating cooling nitrogen gas inlet hole 6 is formed in the side wall, close to the bottom, of the kiln slag heat exchange device 4, the circulating cooling nitrogen gas inlet hole 6 is connected with the gas inlet of a circulating cooling nitrogen pipeline 20, 8 groups of circulating cooling nitrogen gas exhaust holes 21 are formed in the pipe wall of the circulating cooling nitrogen pipeline 20, a circulating high-temperature nitrogen gas outlet hole 7 is formed in the side wall, close to the top, of the kiln slag heat exchange device 4, the circulating high-temperature nitrogen gas outlet hole 7 is connected with the gas outlet of a circulating high-temperature nitrogen pipeline 18, 8 groups of circulating high-temperature nitrogen gas exhaust holes 19 are formed in the pipe wall of the circulating high-temperature nitrogen pipeline 18, the circulating high-temperature nitrogen gas exhaust holes 19 and the circulating cooling nitrogen gas exhaust holes 21 are arranged to be favorable for uniform distribution of heat exchange air flow, and the gas-solid heat exchange efficiency is improved.
In the embodiment, high-temperature iron-rich kiln slag 2 generated by the rotary kiln 1 is sent into the kiln slag heat exchange device 4 through the transmission machine 3, cooling nitrogen is utilized to enter the kiln slag heat exchange device 4 through the circulating cooling nitrogen inlet hole 6 to perform gas-solid heat exchange, high-temperature nitrogen enters the nitrogen-air heat exchanger 5 through the circulating high-temperature nitrogen outlet hole 7 to heat air 8, the nitrogen after the heat exchange is completed circulates to the kiln slag heat exchange device 4 to continue to exchange heat with the kiln slag, the high-temperature air 8 enters the rotary kiln 1 through the rotary kiln blast pipe 10 to participate in metallurgical dust smelting production, in the process, the kiln slag heat exchange device 4 uses the nitrogen to exchange heat with the kiln slag, the elemental iron in the kiln slag can be prevented from being oxidized again, and the metallization rate of the kiln slag is ensured.
In the kiln slag heat exchange device 4, high-temperature iron-rich kiln slag 2 is screened by a vibrating screen 11, fine-grained high-temperature iron-rich kiln slag 2 is collected by a powder pipeline 12, coarse-grained high-temperature iron-rich kiln slag 2 enters a large hopper 13, passes through a large hopper cover plate 14 and then enters a waiting bin through a distributor 15, then enters a heat exchange chamber through a left hopper cover plate 16 and a right hopper cover plate 17, nitrogen enters the heat exchange chamber through a circulating cooling nitrogen inlet 6 to exchange heat with the high-temperature iron-rich kiln slag, the high-temperature nitrogen is discharged through a circulating high-temperature nitrogen exhaust hole 7, the cooled iron-rich kiln slag 23 enters the vibrating screen 2 through a vibrating screen 22, fine-grained kiln slag enters a dust collecting chamber 24, and coarse-grained feeder kiln slag is transported to a designated stock ground.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The waste heat exchange device for the metallurgical dust rotary kiln slag comprises a rotary kiln (1) and a kiln slag heat exchange device (4), and is characterized in that a conveyor (3) is installed at the bottom of the rotary kiln (1), the tail end of the conveyor (3) is located above a feed inlet of the kiln slag heat exchange device (4), one side of the kiln slag heat exchange device (4) is communicated with a nitrogen-air heat exchanger (5), air (8) is introduced into the bottom of the nitrogen-air heat exchanger (5), high-temperature air in the nitrogen-air heat exchanger (5) flows to a rotary kiln blast pipe (10), and the rotary kiln blast pipe (10) is installed on the rotary kiln (1);
kiln sediment heat transfer device (4) are including the organism shell, shake sieve (11), big hopper (13), vibratory feeder (22) and dust collecting chamber (24), big hopper (13) are installed at the top of organism shell, shake sieve (11) and install in the oblique top department of big hopper (13), be equipped with circulation high temperature nitrogen gas pipeline (18) and circulation cooling nitrogen gas pipeline (20) in the organism shell respectively, tripper (15) are installed to the top of circulation high temperature nitrogen gas pipeline (18), the both sides of tripper (15) are provided with left hopper apron (16) and right hopper apron (17) respectively, be the heat transfer chamber in the middle of circulation high temperature nitrogen gas pipeline (18) and circulation cooling nitrogen gas pipeline (20), vibratory feeder (22) are installed in the exit end below of organism shell, and dust collecting chamber (24) are linked together with the bottom of vibratory feeder (22).
2. The metallurgical dust rotary kiln slag waste heat exchange device as claimed in claim 1, wherein a circulating cooling nitrogen gas inlet hole (6) is formed in the side wall of the kiln slag heat exchange device (4) close to the bottom, the circulating cooling nitrogen gas inlet hole (6) is connected with a gas inlet of a circulating cooling nitrogen gas pipeline (20), and a plurality of groups of circulating cooling nitrogen gas exhaust holes (21) are formed in the pipe wall of the circulating cooling nitrogen gas pipeline (20).
3. The metallurgical dust rotary kiln slag waste heat exchange device as claimed in claim 1, wherein a circulating high temperature nitrogen gas outlet hole (7) is formed in the side wall of the kiln slag heat exchange device (4) close to the top, the circulating high temperature nitrogen gas outlet hole (7) is connected with the gas outlet of a circulating high temperature nitrogen pipeline (18), and a plurality of groups of circulating high temperature nitrogen gas exhaust holes (19) are formed in the pipe wall of the circulating high temperature nitrogen pipeline (18).
4. The slag waste heat exchange device of the metallurgical dust rotary kiln as recited in claim 1, wherein the circulating high-temperature nitrogen pipeline (18) and the circulating cooling nitrogen pipeline (20) are both in an annular structure.
5. The waste heat exchange device for metallurgical dust rotary kiln slag as claimed in claim 1, wherein the nitrogen-air heat exchanger (5) is provided with a high temperature air vent hole (9) for high temperature air to overflow.
6. The slag waste heat exchange device of the metallurgical dust rotary kiln according to claim 1, wherein a powder pipeline (12) is arranged at the bottom of the vibrating screen (11), and the powder pipeline (12) is arranged opposite to the large hopper (13).
7. The slag waste heat exchange device of the metallurgical dust rotary kiln as recited in claim 1, characterized in that a large hopper cover plate (14) is installed at the position of the large hopper (13) close to the machine body shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110460269.8A CN113251810A (en) | 2021-04-27 | 2021-04-27 | Metallurgical dust rotary kiln sediment waste heat transfer device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110460269.8A CN113251810A (en) | 2021-04-27 | 2021-04-27 | Metallurgical dust rotary kiln sediment waste heat transfer device |
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| CN113251810A true CN113251810A (en) | 2021-08-13 |
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| CN202110460269.8A Pending CN113251810A (en) | 2021-04-27 | 2021-04-27 | Metallurgical dust rotary kiln sediment waste heat transfer device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115747392A (en) * | 2022-11-16 | 2023-03-07 | 中冶南方都市环保工程技术股份有限公司 | Rotary kiln slag treatment system and method |
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| CN101716553A (en) * | 2009-12-28 | 2010-06-02 | 河南理工大学 | Kiln slag processing technology of zinc volatilizing kiln |
| UA102468C2 (en) * | 2009-11-24 | 2013-07-10 | Сентрал Айен Энд Стил Рисёч Инститьют | Method for production of cast iron and method for conveying and charging of hot raw materials (variants) and equipment thereof |
| CN205443347U (en) * | 2016-03-25 | 2016-08-10 | 江苏省冶金设计院有限公司 | Liquid high temperature metallurgical slag sensible heat recovery device |
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2021
- 2021-04-27 CN CN202110460269.8A patent/CN113251810A/en active Pending
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| CN101716553A (en) * | 2009-12-28 | 2010-06-02 | 河南理工大学 | Kiln slag processing technology of zinc volatilizing kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115747392A (en) * | 2022-11-16 | 2023-03-07 | 中冶南方都市环保工程技术股份有限公司 | Rotary kiln slag treatment system and method |
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