CN113295011A - Sintering two-stage cooling waste heat recovery system - Google Patents
Sintering two-stage cooling waste heat recovery system Download PDFInfo
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- CN113295011A CN113295011A CN202110005921.7A CN202110005921A CN113295011A CN 113295011 A CN113295011 A CN 113295011A CN 202110005921 A CN202110005921 A CN 202110005921A CN 113295011 A CN113295011 A CN 113295011A
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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
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning 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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- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a sintering two-stage cooling waste heat recovery system, which comprises a pre-cooling device, a ring cooling machine, an overheating device and a waste heat boiler, wherein the pre-cooling device is arranged on a falling path of hot sintered ore between a discharge end of a crusher corresponding to a sintering machine and a feed end of the ring cooling machine, the upper end of the pre-cooling device faces the discharge end of the crusher to form a hot ore inlet, the lower end of the pre-cooling device faces the feed end of the ring cooling machine to form a hot ore outlet, the pre-cooling device further comprises a hot air outlet, the hot ore inlet and the hot ore outlet are respectively used as cooling air inlets corresponding to the hot air outlet, the overheating device comprises a first medium pipeline and a second medium pipeline which can exchange heat with each other, and an overheated steam outlet of the waste heat boiler is connected to a power generation system through the second medium pipeline. The sintering two-stage cooling waste heat recovery system aims at solving the technical problem that the utilization efficiency of flue gas waste heat in the sintering process in the prior art is not high.
Description
Technical Field
The invention relates to the technical field of sintering systems, in particular to a sintering two-stage cooling waste heat recovery system.
Background
The iron and steel industry is the foundation and the pillar industry of national economy in China, the iron and steel smelting in China is mainly based on a long flow of sintering (pelletizing) coking-blast furnace-converter, more than 75% of blast furnace burden is from sintered ore, the sintering process is a high-energy consumption and high-pollution concentrated link in the iron and steel flow, the energy consumption accounts for 10% of the total energy consumption of the iron and steel metallurgy, the amount of discharged waste gas accounts for 50% of the total waste gas amount of the iron and steel industry, and the discharge of micron-sized fine particle dust, SOx, NOx, persistent organic matters, heavy metals and other pollutants in the waste gas all dominates the first place of the iron and steel industry. Because the low-temperature flue gas amount of the existing cooling process is large, a large amount of high-temperature steam is applied to the waste heat boiler, but the utilization efficiency of the flue gas is not high.
Disclosure of Invention
Technical problem to be solved
Based on the technical scheme, the invention provides a sintering two-stage cooling waste heat recovery system, which aims to solve the technical problem of low utilization efficiency of flue gas waste heat in the sintering process in the prior art.
(II) technical scheme
In order to solve the technical problem, the invention provides a sintering two-stage cooling waste heat recovery system, wherein the sintering two-stage cooling waste heat recovery system comprises a pre-cooling device, a ring cooling machine, an overheating device and a waste heat boiler, the pre-cooling device is arranged on a falling path of hot sintered ore between a discharge end of a crusher corresponding to a sintering machine and a feed end of the ring cooling machine, the upper end of the pre-cooling device faces the discharge end of the crusher to form a hot ore inlet, the lower end of the pre-cooling device faces the feed end of the ring cooling machine to form a hot ore outlet, the pre-cooling device further comprises a hot air outlet, the hot ore inlet and the hot ore outlet are respectively used as cooling air inlets corresponding to the hot air outlet, the overheating device comprises a first medium pipeline and a second medium pipeline capable of exchanging heat with each other, and the waste heat boiler comprises an air inlet, a heat exchanger and a heat recovery device, The hot air outlet is connected to the air inlet of the waste heat boiler through a first medium pipeline, and the superheated steam outlet of the waste heat boiler is connected to the power generation system through a second medium pipeline.
Preferably, the air outlet of the waste heat boiler is communicated with the air inlet end of the circular cooler, and the air outlet end of the circular cooler is communicated with the air inlet end of the waste heat boiler.
Preferably, the air outlet end of the circular cooler is also respectively communicated with at least one of a sintering hot air ignition system, a sintering hot air circulation system and an organic Rankine cycle system.
Preferably, the air outlet end of the circular cooler is communicated with the air inlet end of the circular cooler through a cascade utilization device.
Preferably, the first medium pipeline is a main shell, and the second medium pipeline is a pipeline spirally arranged inside and outside the main shell.
Preferably, the sintering two-stage cooling waste heat recovery system further comprises a dust removal device and an air draft fan, and the pre-cooling device, the dust removal device, the first medium pipeline, the air draft fan and the waste heat boiler are sequentially connected.
Preferably, the pre-cooling device comprises a hot-sinter ore slide cylinder, the upper end of the hot-sinter ore slide cylinder is connected with the discharge end of a crusher corresponding to the sintering machine, the lower end of the hot-sinter ore slide cylinder is connected with the feed end of the ring cooling machine, the hot air outlet is positioned on the side wall of the hot-sinter ore slide cylinder, the hot ore inlet is positioned at the upper end of the hot-sinter ore slide cylinder, and the hot ore outlet is positioned at the lower end of the hot-sinter ore slide cylinder.
Preferably, the hot air outlet is located in the middle of the hot sinter ore chute in the vertical direction.
Preferably, the inner wall surface of the hot-sinter ore chute is connected with a first wind shield, the inner wall surface of the bottom of the hot-sinter ore chute is connected with a second wind shield positioned below the first wind shield, and the hot air outlet is arranged between the first wind shield and the second wind shield.
Preferably, the cross section of the hot sinter ore chute is trapezoidal, the upper bottom of the trapezoid corresponds to the position above the side wall of the inner ring of the circular cooler, the lower bottom of the trapezoid corresponds to the position above the side wall of the outer ring of the circular cooler, and the lower bottom is longer than the upper bottom.
(III) advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
through increasing the superheating device link between precooling apparatus and exhaust-heat boiler for superheated steam that exhaust-heat boiler came out is heated by the hot-blast that precooling apparatus draws forth once more, then accesss to power generation system and can utilize, and the hot-blast temperature that precooling apparatus drawn forth simultaneously also obtains reducing in superheating device department and accesss to exhaust-heat boiler, has avoided the hot-blast of too high temperature to lead to exhaust-heat boiler and cause the waste of energy, greatly promotes flue gas waste heat utilization efficiency.
The pre-cooling device and the ring cooling machine form two-stage cooling, after the two-stage cooling is adopted, the cooling air quantity is greatly reduced by the existing cooling equipment, the generated low-temperature cooling waste gas quantity is also greatly reduced, the zero emission of the cooling waste gas can be realized under the effect of meeting the cooling of a sintering ore, the air outlet end of the waste heat boiler is led to the air inlet end of the ring cooling machine, the air outlet end of the ring cooling machine is led to the air inlet end of the waste heat boiler, the closed loop formed in the way is also beneficial to waste gas circulation and beneficial to realizing the zero emission of the cooling waste gas, in addition, the hot ore inlet and the hot ore outlet of the pre-cooling device are respectively used as the cooling air inlet corresponding to the hot air outlet and respectively face the discharge end of the crusher and the feed end of the ring cooling machine, the dust collection and dust fall effects are also realized at the point positions, the dust collection effect of the tail of the sintering machine is particularly enhanced, and the dust collection air quantity is reduced.
The pre-cooling device replaces a chute with a high fall in the prior art, and the pre-cooling device can be filled with mineral materials, so that the falling distance of the mineral materials is greatly reduced, the falling loss of sintered ores is reduced, and the return ores are reduced.
Other advantageous effects of the present invention will be described in the following detailed description.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic diagram of a sintering two-stage cooling waste heat recovery system according to an embodiment of the present invention;
FIG. 2 is a partial block diagram of a sintering two-stage cooling waste heat recovery system according to an embodiment of the present invention;
FIG. 3 is a view showing the internal structure of a pre-cooling device according to a preferred embodiment of the present invention;
FIG. 4 is a top cross-sectional view of a pre-cooling device according to a preferred embodiment of the present invention;
FIG. 5 is a simplified top view of the pre-cooling apparatus and ring cooler assembly of the preferred embodiment of the present invention.
Description of reference numerals:
1. sintering machine, 2, crusher, 3, circular cooler, 4, waste heat boiler, 5, dust removing device, 6, exhaust fan, 7, wear-resistant block, 8, blower, 9, upper bottom, 10, lower bottom, 11, granule finishing system, 12, power generation system, 14, sintering hot air ignition system, 15, sintering hot air circulation system, 16, organic Rankine circulation system, 17, cascade utilization device, 31, inner ring side wall, 32, outer ring side wall, 41, air inlet, 42, air outlet, 43, superheated steam outlet, 100, pre-cooling device, 101, hot sinter ore chute, 102, hot air outlet, 103, hot ore inlet, 104, hot ore outlet, 105, first wind baffle, 106, second wind baffle, 200, superheating device, 201, main shell, 202 and pipeline.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1 to 5, the present invention provides a sintering two-stage cooling waste heat recovery system, which includes a pre-cooling device 100, a ring cooling machine 3, a superheating device 200 and a waste heat boiler 4, wherein the pre-cooling device 100 is disposed on a falling path of hot sintered ore between a discharge end of a crusher 2 and a feed end of the ring cooling machine 3 corresponding to the sintering machine 1, an upper end of the pre-cooling device 100 faces a discharge end of the crusher 2 to form a hot ore inlet 103, a lower end of the pre-cooling device 100 faces a feed end of the ring cooling machine 3 to form a hot ore outlet 104, the pre-cooling device 100 further includes a hot air outlet 102, the hot ore inlet 103 and the hot ore outlet 104 are respectively used as cooling air inlets corresponding to the hot air outlet 102, the superheating device 200 includes a first medium pipeline and a second medium pipeline capable of exchanging heat with each other, the waste heat boiler 4 includes an air inlet 41, an air outlet 42 and a superheated steam outlet 43, the hot air outlet 102 is connected to an air inlet 41 of the waste heat boiler 4 through the first medium pipeline, the superheated steam outlet 43 of the waste heat boiler 4 is connected via a second medium line to the power generation system 12, which power generation system 12 may comprise various known power generation devices.
The specific structure of the superheating device 200 is not particularly limited, and as a specific embodiment, the first medium pipeline is a main casing 201, and the second medium pipeline is a pipe 202 spirally passing through the inside and the outside of the main casing 201. The sintering two-stage cooling waste heat recovery system further comprises a dust removal device 5 and an air draft fan 6, and the pre-cooling device 100, the dust removal device 5, the first medium pipeline, the air draft fan 6 and the waste heat boiler 4 are sequentially connected.
According to the specific embodiment of the invention, the air outlet of the waste heat boiler is communicated with the air inlet end of the ring cooling machine, the air outlet end of the ring cooling machine is communicated with the air inlet end of the waste heat boiler, the air outlet end of the ring cooling machine 3 is also respectively communicated with at least one of the sintering hot air ignition system 14, the sintering hot air circulation system 15 and the Organic Rankine circulation system 16, and the Organic Rankine Cycle (ORC) is a Rankine Cycle using low-boiling-point Organic matter as a working medium and mainly comprises four major sleeves of the waste heat boiler (or a heat exchanger), a turbine, a condenser and a working medium pump. The air outlet end of the circular cooler 3 is led to the air inlet end of the circular cooler 3 through a cascade utilization device 17 (comprising a pipeline, a fan arranged on the pipeline and the like).
According to the embodiment of the present invention, the pre-cooling device 100 includes a hot-sinter chute 101, but is not limited to the chute structure, the upper end of the hot-sinter chute 101 is connected to the discharge end of the crusher 2 corresponding to the sintering machine 1, the lower end of the hot-sinter chute 101 is connected to the feed end of the ring cooler 3, a hot air outlet 102 is located on the side wall of the hot-sinter chute 101, a hot ore inlet 103 is located on the upper end of the hot-sinter chute 101, a hot ore outlet 104 is located on the lower end of the hot-sinter chute 101, and the hot ore inlet 103 and the hot ore outlet 104 are respectively used as cooling air inlets, although the hot air outlet 102 is not provided on the side wall of the hot-sinter chute 101, but the hot air is directly led out from the upper end or the lower end of the hot-sinter chute 101, for example, referring to fig. 3 and 4, the hot air can be led out from the lower end of the hot-sinter chute 101, and the hot ore inlet 103 on the upper end of the hot-sinter chute 101 is used as a cooling air inlet, or the hot air can be led out from the upper end of the hot sinter ore chute 101, and the hot ore outlet 104 at the lower end of the hot sinter ore chute 101 is also used as a cooling air inlet. The hot air outlet 102 is connected to the waste heat recovery system through the dust removal device 5 and the air draft fan in sequence, and a plurality of air blowers 8 can be arranged below the circular cooler 3 to increase the air volume of cooling air.
Preferably, the hot air outlet 102 is located in the middle of the hot-sinter ore chute 101 in the vertical direction, so that the cooling air inlets at the upper and lower ends of the hot-sinter ore chute 101 enter the hot-sinter ore chute 101 to pass through the material bed of the hot-sinter ore at approximately the same penetration distance (thickness), facilitating the acquisition of the required high-quality hot air.
Referring to fig. 3, according to a preferred embodiment of the present invention, a first wind deflector 105 is connected to an inner wall surface of a hot-sinter ore chute 101, a second wind deflector 106 is connected to an inner wall surface of a bottom of the hot-sinter ore chute 101 below the first wind deflector 105, a wear-resistant block 7 (e.g., a high-hardness alloy, etc.) may be disposed above the first wind deflector 105 and the second wind deflector 106 to prevent wear by the hot-sinter ore, and a hot air outlet 102 is disposed between the first wind deflector 105 and the second wind deflector 106, so that cooling air entering from an upper end of the hot-sinter ore chute 101 bypasses the first wind deflector 105 and reaches the hot air outlet 102, cooling air entering from a lower end of the hot-sinter ore chute 101 bypasses the second wind deflector 106 and reaches the hot air outlet 102, and the cooling air increases a contact route with a material layer of the hot-sinter ore during the bypassing, thereby having a longer penetration distance, to better and more efficiently cool the hot sinter.
In addition, referring to fig. 4 and 5, the cross section of the hot sinter chute 101 is trapezoidal, the trapezoidal upper bottom 9 corresponds to the position above the inner ring side wall 31 of the ring cooling machine 3, the trapezoidal lower bottom 10 corresponds to the position above the outer ring side wall 32 of the ring cooling machine 3, and the lower bottom 10 is longer than the upper bottom 9, that is, the hot sinter chute 101 has a larger blanking space on the outer ring side 32 of the ring cooling machine 3, so that the hot sinter chute perfectly matches and adapts to the specific structure of the ring cooling machine 3, the inner and outer rings of the ring cooling machine 3 are uniformly distributed, the cooling efficiency is improved, and the material falls into the granulating system 11 after passing through the ring cooling machine 3, and finally finished sinter is formed.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A sintering two-stage cooling waste heat recovery system is characterized by comprising a pre-cooling device, a ring cooling machine, an overheating device and a waste heat boiler, wherein the pre-cooling device is arranged on a falling path of hot sintering ore between a discharge end of a crusher corresponding to a sintering machine and a feed end of the ring cooling machine, the upper end of the pre-cooling device faces the discharge end of the crusher to form a hot ore inlet, the lower end of the pre-cooling device faces the feed end of the ring cooling machine to form a hot ore outlet, the pre-cooling device further comprises a hot air outlet, the hot ore inlet and the hot ore outlet are respectively used as cooling air inlets corresponding to the hot air outlet, the overheating device comprises a first medium pipeline and a second medium pipeline which can exchange heat with each other, and the waste heat boiler comprises an air inlet, an air outlet and an overheated steam outlet, the hot air outlet is connected to the air inlet of the waste heat boiler through a first medium pipeline, and the superheated steam outlet of the waste heat boiler is connected to the power generation system through a second medium pipeline.
2. The sintering two-stage cooling waste heat recovery system according to claim 1, wherein an air outlet of the waste heat boiler is communicated with an air inlet end of the circular cooler, and an air outlet end of the circular cooler is communicated with an air inlet end of the waste heat boiler.
3. The sintering two-stage cooling waste heat recovery system according to claim 2, wherein the air outlet end of the circular cooler is further respectively communicated with at least one of a sintering hot air ignition system, a sintering hot air circulation system and an organic Rankine cycle system.
4. The system for recycling two-stage cooling waste heat in sintering of claim 2, wherein the air outlet end of the circular cooler is communicated with the air inlet end of the circular cooler through a cascade utilization device.
5. The system for recycling two-stage cooling waste heat in sintering according to any one of claims 1 to 4, wherein the first medium pipeline is a main shell, and the second medium pipeline is a pipeline spirally arranged inside and outside the main shell.
6. The system for recycling waste heat of two-stage sintering cooling as claimed in any one of claims 1 to 4, further comprising a dust removal device and an air draft fan, wherein the pre-cooling device, the dust removal device, the first medium pipeline, the air draft fan and the waste heat boiler are connected in sequence.
7. The system for recovering the waste heat in the two-stage sintering cooling process according to any one of claims 1 to 4, wherein the pre-cooling device comprises a hot-sinter ore slide drum, the upper end of the hot-sinter ore slide drum is connected with the discharge end of a crusher corresponding to the sintering machine, the lower end of the hot-sinter ore slide drum is connected with the feed end of the ring cooling machine, the hot air outlet is positioned on the side wall of the hot-sinter ore slide drum, the hot ore inlet is positioned at the upper end of the hot-sinter ore slide drum, and the hot ore outlet is positioned at the lower end of the hot-sinter ore slide drum.
8. The sintering two-stage cooling waste heat recovery system according to claim 7, wherein the hot air outlet is located in the middle of the hot sinter ore chute in the vertical direction.
9. The two-stage sintering cooling waste heat recovery system according to claim 7, wherein a first wind shield is connected to an inner wall surface of the hot-sinter ore chute, a second wind shield located below the first wind shield is connected to an inner wall surface of the bottom of the hot-sinter ore chute, and the hot air outlet is arranged between the first wind shield and the second wind shield.
10. The system for recovering waste heat from two-stage cooling in sintering according to claim 7, wherein the cross section of the hot sinter ore chute is trapezoidal, the upper bottom of the trapezoid corresponds to the position above the side wall of the inner ring of the circular cooler, the lower bottom of the trapezoid corresponds to the position above the side wall of the outer ring of the circular cooler, and the lower bottom is longer than the upper bottom.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110005921.7A CN113295011A (en) | 2021-01-05 | 2021-01-05 | Sintering two-stage cooling waste heat recovery system |
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| CN202110005921.7A CN113295011A (en) | 2021-01-05 | 2021-01-05 | Sintering two-stage cooling waste heat recovery system |
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2021
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| CN201016117Y (en) * | 2006-10-26 | 2008-02-06 | 宝山钢铁股份有限公司 | Rotary hearth furnace tore material evenly arranging device |
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