CN114777508A - Multi-stage waste heat efficient recycling system for smelting slag - Google Patents
Multi-stage waste heat efficient recycling system for smelting slag Download PDFInfo
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- CN114777508A CN114777508A CN202210485241.4A CN202210485241A CN114777508A CN 114777508 A CN114777508 A CN 114777508A CN 202210485241 A CN202210485241 A CN 202210485241A CN 114777508 A CN114777508 A CN 114777508A
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
Abstract
The invention discloses a multi-stage waste heat efficient recycling system for smelting molten slag, which comprises a granulator, a heat exchange furnace, a stacking bed, a conveying belt, a steam drum, a gas-water heat exchanger, a first dust remover, a second dust remover, a buffer tank and a water storage tank, wherein the granulator is positioned at the upper part of the heat exchange furnace and is used for carrying out primary waste heat recovery through cold air heat exchange, and the heat exchange furnace is used for carrying out secondary waste heat recovery on granulated solid molten slag particles; the accumulation bed carries out third waste heat recovery on the solid slag particles after heat exchange in an accumulation pipe burying mode; discharging the cooled solid slag particles from the lower part of the stacking bed; hot flue gas discharged from the granulator and the heat exchange furnace is dedusted and then enters the gas-water heat exchanger, cold flue gas discharged from the gas-water heat exchanger is sent to the buffer tank for storage after passing through the second deduster, the cold flue gas is recycled after being supplemented with air, steam generated by the system enters the steam drum, the steam is subjected to steam-water separation in the steam drum, hot water enters the water storage tank and is recycled after being supplemented with air, and the steam is recycled.
Description
Technical Field
The invention relates to the technical field of smelting of molten slag, in particular to a multi-stage waste heat efficient recycling system for smelting molten slag.
Background
With the increasing aggravation of the energy bottleneck problem in China, the metallurgical industry which consumes a lot of energy needs to realize green sustainable development, develop and utilize and efficiently recover the sensible heat resource of high-temperature molten slag, and become one of the future important energy-saving tasks of the metallurgical industry. Aiming at reducing energy consumption and pollutant discharge, the method comprehensively implements energy conservation, emission reduction, upgrading and reconstruction, and increases the development and application of the technologies such as smelting slag high-efficiency treatment, deep comprehensive utilization, slag waste heat recovery, resource utilization and the like.
The slag treatment methods are various, and the adopted waste heat recovery technology has the characteristics respectively. The air quenching method mainly takes air as a medium, and performs waste heat recovery through the direct contact of the air and the slag, so that the heat recovery efficiency is higher, but the treatment efficiency of the slag is low; the mechanical crushing method and the centrifugal method mainly take air and cooling water as media, part of the mechanical crushing method and the centrifugal method also adopt heat conduction oil, organic liquid and the like with high heat conduction efficiency, and waste heat recovery is carried out through direct contact of air and molten slag and indirect contact of water (heat conduction oil and the like) and the molten slag. Through the analysis of the existing slag waste heat recovery technology, the main problems of the existing slag waste heat recovery technology are that the consumption of cooling water is large, the slag simple substance iron is easy to oxidize, and the like.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a multi-stage waste heat efficient recycling system for smelting slag.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
the utility model provides a smelt multistage waste heat high-efficient recycle system of slag, includes granulator, regenerator, piles up bed, conveyer belt, steam pocket, air water heat exchanger, first dust remover, second dust remover, buffer tank, water storage tank, the discharge end of granulator is linked together with the feed end of regenerator, the discharge end of regenerator is linked together through conveyer belt and the feed end of piling up the bed, the input of first dust remover is linked together through flue gas pipeline and granulator air outlet, regenerator air outlet respectively, the output of first dust remover is linked together through flue gas pipeline and air water heat exchanger's input, the output of air water heat exchanger is linked together through flue gas pipeline and second dust remover's input, the output of second dust remover is linked together through flue gas pipeline and buffer tank's input, the output of buffer tank passes through flue gas pipeline and circulating fan respectively with regenerator air intake, The air inlet of the granulator is communicated, and the output end of the steam drum is communicated with the water storage tank through a water pipe;
specifically, the outer walls of the granulators are provided with granulator water-cooled walls, the water storage tank is communicated with the input ends of the granulator water-cooled walls through the matching of a water pipe and a circulating water pump, and the output ends of the granulator water-cooled walls are communicated with the input ends of the steam drums through steam pipelines;
specifically, the outer wall of the heat exchange furnace is provided with a heat exchange furnace water-cooled wall, the water storage tank is communicated with the input end of the heat exchange furnace water-cooled wall through the matching of a water pipe and a circulating water pump, and the output end of the heat exchange furnace water-cooled wall is communicated with the input end of the steam drum through a steam pipeline;
furthermore, the granulator water-cooled wall and the heat exchange furnace water-cooled wall have the same structure and are both jacket hollow structures, the granulator water-cooled wall is provided with a granulator water-cooled wall water inlet and a granulator water-cooled wall water outlet, the granulator water-cooled wall water inlet is connected with the output end of the water storage tank, the granulator water-cooled wall water outlet is communicated with the steam drum, the heat exchange furnace water-cooled wall is provided with a heat exchange furnace water-cooled wall water inlet and a heat exchange furnace water-cooled wall water outlet, the heat exchange furnace water-cooled wall water inlet is connected with the output end of the water storage tank, and the heat exchange furnace water-cooled wall water outlet is communicated with the steam drum;
further, a stacking bed heat exchanger is arranged inside the stacking bed, two ends of the stacking bed heat exchanger are respectively connected with a stacking bed heat exchanger water outlet and a stacking bed heat exchanger water inlet, the stacking bed heat exchanger water inlet is communicated with the output end of the water storage tank, the stacking bed heat exchanger water outlet is communicated with the input end of the steam drum, and a stacking bed heat-insulating layer is arranged on the outer wall of the stacking bed;
further, a conical coil is arranged in the recuperative furnace, a conical coil water outlet and a conical coil water inlet are respectively arranged at two ends of the conical coil, the conical coil water inlet is communicated with the output end of the water storage tank, and the conical coil water outlet is communicated with the input end of the steam drum;
furthermore, an upper conical guide plate, a middle conical guide plate and a lower conical guide plate are arranged inside the heat exchange furnace, and the upper conical guide plate, the middle conical guide plate and the lower conical guide plate are all fixed on the inner wall of the heat exchange furnace;
furthermore, a recuperative furnace air outlet is formed in the top of the recuperative furnace and is communicated with the first dust remover through a flue gas pipeline, a recuperative furnace air inlet pipe is arranged at the bottom of the recuperative furnace and is communicated with the buffer tank, and an air cap is arranged at the top of the recuperative furnace air inlet pipe.
Furthermore, a plurality of groups of blanking through holes with different diameters are arranged on the upper conical guide plate, the middle conical guide plate and the lower conical guide plate;
further, a gas-water heat exchanger coil is arranged inside the gas-water heat exchanger, one end of the gas-water heat exchanger coil is communicated with the water storage tank through a water pipe, and the other end of the gas-water heat exchanger coil is communicated with the steam drum through a flue gas pipeline.
Compared with the prior art, the smelting slag multistage waste heat high-efficiency recycling system has the following beneficial effects:
the slag is granulated by the granulator, and the waste heat is recycled for the first time by air cooling and indirect heat exchange of a water-cooled wall of the granulator; the stacking bed is arranged near the heat exchange furnace, slag particles are conveyed to an inlet at the upper part of the stacking bed from the bottom of the heat exchange furnace through a conveyer belt, the third waste heat recovery is carried out by adopting a mode of internally stacking and burying pipes (a stacking bed heat exchanger), and the cooled slag particles are discharged from the lower part of the stacking bed.
The cooling gas in the invention is recycled, the recycling gas is initially air, and after a period of recycling, the oxygen in the recycling gas is depleted due to oxidation and turns into smoke. And hot flue gas discharged from the granulator and the heat exchange furnace is dedusted and then enters the gas-water heat exchanger, and cold flue gas discharged from the gas-water heat exchanger is conveyed to the buffer tank for storage after passing through the second deduster, and is recycled after being supplemented with air. Steam generated by the system enters the steam drum, steam-water separation is carried out on the steam in the steam drum, hot water enters the water storage tank, water is supplemented, circulation is carried out again, and the steam is recycled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a block diagram of a waste heat recovery system of the present invention;
FIG. 3 is a schematic view of the granulator configuration of the present invention;
FIG. 4 is a schematic view of a heat exchange furnace according to the present invention;
FIG. 5 is a schematic view of the packed bed structure of the present invention;
FIG. 6 is a schematic view of the lower tapered guide plate structure of the present invention;
fig. 7 is a schematic view of the structure of the hood of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and specific embodiments, which are provided herein for the purpose of illustrating the invention and are not to be construed as limiting the invention.
The smelting slag multistage waste heat high-efficiency recycling system shown in fig. 1-5 comprises a granulator 100, a heat exchange furnace 200, a stacking bed 300, a conveyer belt 400, a steam drum 500, a gas-water heat exchanger 600, a first dust remover 700, a second dust remover 800, a buffer tank 900 and a water storage tank 1000, wherein the discharge end of the granulator 100 is communicated with the feed end of the heat exchange furnace 200, the discharge end of the heat exchange furnace 200 is communicated with the feed end of the stacking bed 300 through the conveyer belt 400, the input end of the first dust remover 700 is respectively communicated with a granulator air outlet 2 and a heat exchange furnace air outlet 17 through a flue gas pipeline 50, the output end of the first dust remover 700 is communicated with the input end of the gas-water heat exchanger 600 through a flue gas pipeline 50, the output end of the gas-water heat exchanger 600 is communicated with the input end of the second dust remover 800 through a flue gas pipeline 50, the output end of the second dust remover 800 is communicated with the input end of the buffer tank 900 through a flue gas pipeline 50, the output end of the buffer tank 900 is respectively communicated with the air inlet 28 of the recuperative furnace and the air inlet 15 of the granulator through a flue gas pipeline 50 and a circulating fan 60, and the output end of the steam drum 500 is communicated with the water storage tank 1000 through a water pipe 70.
In this embodiment, as shown in fig. 3, the outer walls of the granulator 100 are provided with a granulator water-cooled wall 9, the water storage tank 1000 is communicated with the input end of the granulator water-cooled wall 9 through the cooperation of the water pipe 70 and the circulating water pump 80, and the output end of the granulator water-cooled wall 9 is communicated with the input end of the steam drum 500 through the steam pipeline 90; in this embodiment, the inside of the granulator is provided with a double-layered centrifugal granulation device, which is the invention patent No. 202011488186.1 previously filed by the applicant of the present invention, and which has specifically disclosed the structure of the double-layered granulation device, as shown in fig. 3, in which the components of the structure of the double-layered granulation device include: 1-a feed inlet, 2-a granulator air outlet, 3-an upper layer perforated rotating cup, 4-a drainage hole, 5-a granulator water-cooled wall water outlet, 6-a lower layer rotating cup, 7-a rotating shaft, 8-a ventilation opening, 9-a granulator water-cooled wall, 10-an air guide chassis, 11-a bearing, 12-an air pipe sleeve, 13-a granulator discharge opening, 14-a granulator water-cooled wall water inlet, 15-a granulator air inlet and 16-a driving device; again, the specific structure will not be described in more detail.
In this embodiment, as shown in fig. 3, the outer walls of the heat exchange furnaces 200 are all provided with heat exchange furnace water-cooled walls 24, the water storage tank 1000 is communicated with the input end of the heat exchange furnace water-cooled walls 24 through the cooperation of the water pipes 70 and the circulating water pump 80, and the output end of the heat exchange furnace water-cooled walls 24 is communicated with the input end of the steam drum 500 through the steam pipeline 90.
In this embodiment, as shown in fig. 3-4, the granulator water-cooled wall 9 and the heat-exchange furnace water-cooled wall 24 have the same structure and are both jacket hollow structures, the granulator water-cooled wall 9 is provided with a granulator water-cooled wall water inlet 14 and a granulator water-cooled wall water outlet 5, the granulator water-cooled wall water inlet 14 is connected with the output end of the water storage tank 1000, the granulator water-cooled wall water outlet 5 is communicated with the steam drum 500, the heat-exchange furnace water-cooled wall 24 is provided with a heat-exchange furnace water-cooled wall water inlet 29 and a heat-exchange furnace water-cooled wall water outlet 19, the heat-exchange furnace water-cooled wall water inlet 29 is connected with the output end of the water storage tank 1000, and the heat-exchange furnace water-cooled wall water outlet 19 is communicated with the steam drum 500.
In this embodiment, as shown in fig. 5, a stacked bed heat exchanger 33 is disposed inside the stacked bed 300, two ends of the stacked bed heat exchanger 33 are respectively connected to a stacked bed heat exchanger water outlet 31 and a stacked bed heat exchanger water inlet 32, the stacked bed heat exchanger water inlet 31 is communicated with an output end of the water storage tank 1000, the stacked bed heat exchanger water outlet 32 is communicated with an input end of the steam drum 500, a stacked bed heat insulation layer 30 is disposed on an outer wall of the stacked bed 300, and in fig. 5, 34 is a feed opening of the stacked bed.
In this embodiment, as shown in fig. 4, a conical coil 22 is disposed in the recuperative furnace 200, two ends of the conical coil 22 are a conical coil water outlet 20 and a conical coil water inlet 21, respectively, the conical coil water inlet 21 is communicated with an output end of the water storage tank 1000, and the conical coil water outlet 20 is communicated with an input end of the steam drum 500; an upper conical guide plate 18, a middle conical guide plate 23 and a lower conical guide plate 25 are arranged inside the heat exchange furnace 200, and the upper conical guide plate 18, the middle conical guide plate 23 and the lower conical guide plate 25 are all fixed on the inner wall of the heat exchange furnace 200; as shown in fig. 6, a plurality of sets of blanking through holes 42 with different diameters are arranged on the upper conical guide plate 18, the middle conical guide plate 23 and the lower conical guide plate 25.
In this embodiment, as shown in fig. 4, a recuperator furnace air outlet 17 is disposed at the top of the recuperator furnace 200, the recuperator furnace air outlet 17 is communicated with the first dust collector 700 through a flue gas pipeline 50, a recuperator furnace air inlet pipe 27 is disposed at the bottom of the recuperator furnace 200, the recuperator furnace air inlet pipe 27 is communicated with the buffer tank 900, as shown in fig. 7, an air cap 26 is disposed at the top of the recuperator furnace air inlet pipe 27, and an air outlet 44 is disposed on the recuperator furnace air inlet pipe 27.
In this embodiment, as shown in fig. 1, a gas-water heat exchanger coil 601 is disposed inside the gas-water heat exchanger 600, one end of the gas-water heat exchanger coil 601 is communicated with the water storage tank 1000 through a water pipe 70, and the other end is communicated with the steam drum 500 through a flue gas pipe 50.
The principle of the invention is as follows:
the slag is granulated by the granulator, and the waste heat is recycled for the first time by air cooling and indirect heat exchange of a water-cooled wall of the granulator; the stacking bed is arranged near the heat exchange furnace, slag particles are conveyed to an inlet at the upper part of the stacking bed from the bottom of the heat exchange furnace through a conveying belt, the mode of internally stacking and burying pipes (a stacking bed heat exchanger) is adopted for carrying out the third waste heat recovery, and the cooled slag particles are discharged from the lower part of the stacking bed.
In the invention, the cooling gas is recycled, the recycling gas is initially air, and after a period of recycling, the oxygen in the recycling gas is consumed due to oxidation and becomes smoke. And hot flue gas discharged from the granulator and the heat exchange furnace enters the gas-water heat exchanger after being dedusted, and cold flue gas discharged from the gas-water heat exchanger is sent to the buffer tank for storage after passing through the second deduster, and is recycled after being supplemented with air. Steam generated by the system enters the steam drum, steam-water separation is carried out on the steam in the steam drum, hot water enters the water storage tank and is recycled after being supplemented with water, and the steam is recycled.
The technical solution of the present invention is not limited to the above-mentioned specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (8)
1. The system is characterized by comprising a granulator, a regenerative furnace, a stacking bed, a conveying belt, a steam drum, a gas-water heat exchanger, a first dust remover, a second dust remover, a buffer tank and a water storage tank, wherein the discharge end of the granulator is communicated with the feed end of the regenerative furnace, the discharge end of the regenerative furnace is communicated with the feed end of the stacking bed through the conveying belt, the input end of the first dust remover is respectively communicated with the air outlet of the granulator and the air outlet of the regenerative furnace through a flue gas pipeline, the output end of the first dust remover is communicated with the input end of the gas-water heat exchanger through a flue gas pipeline, the output end of the gas-water heat exchanger is communicated with the input end of the second dust remover through a flue gas pipeline, the output end of the second dust remover is communicated with the input end of the buffer tank through a flue gas pipeline, and the output end of the buffer tank is respectively communicated with the air inlet of the regenerative furnace through a flue gas pipeline and a circulating fan, The air inlet of the granulator is communicated, and the output end of the steam drum is communicated with the water storage tank through a water pipe;
the outer walls of the granulators are provided with granulator water-cooled walls, the water storage tank is communicated with the input ends of the granulator water-cooled walls through the matching of a water pipe and a circulating water pump, and the output ends of the granulator water-cooled walls are communicated with the input ends of the steam drums through steam pipelines;
the outer wall of the recuperative furnace is provided with a recuperative furnace water-cooled wall, the water storage tank is communicated with the input end of the recuperative furnace water-cooled wall through the matching of a water pipe and a circulating water pump, and the output end of the recuperative furnace water-cooled wall is communicated with the input end of the steam drum through a steam pipeline.
2. The system for recycling the multi-stage waste heat of the smelting slag according to claim 1, wherein the granulator water-cooled wall and the heat-exchange furnace water-cooled wall have the same structure and are both jacket hollow structures, the granulator water-cooled wall is provided with a granulator water-cooled wall water inlet and a granulator water-cooled wall water outlet, the granulator water-cooled wall water inlet is connected with the output end of the water storage tank, the granulator water-cooled wall water outlet is communicated with the steam drum, the heat-exchange furnace water-cooled wall is provided with a heat-exchange furnace water-cooled wall water inlet and a heat-exchange furnace water-cooled wall water outlet, the heat-exchange furnace water-cooled wall water inlet is connected with the output end of the water storage tank, and the heat-exchange furnace water-cooled wall water outlet is communicated with the steam drum.
3. The smelting slag multi-stage waste heat efficient recycling system according to claim 1, wherein a stacking bed heat exchanger is arranged inside the stacking bed, both ends of the stacking bed heat exchanger are respectively connected with a stacking bed heat exchanger water outlet and a stacking bed heat exchanger water inlet, the stacking bed heat exchanger water inlet is communicated with an output end of the water storage tank, the stacking bed heat exchanger water outlet is communicated with an input end of the steam drum, and a stacking bed heat insulation layer is arranged on the outer wall of the stacking bed.
4. The system for efficiently recycling the multi-stage waste heat of smelting slag according to claim 1, wherein a conical coil is arranged in the recuperative furnace, a conical coil water outlet and a conical coil water inlet are respectively arranged at two ends of the conical coil, the conical coil water inlet is communicated with the output end of the water storage tank, and the conical coil water outlet is communicated with the input end of the steam drum.
5. The system for efficiently recycling the multi-stage waste heat of the smelting slag according to claim 4, wherein an upper conical guide plate, a middle conical guide plate and a lower conical guide plate are arranged inside the heat exchange furnace, and the upper conical guide plate, the middle conical guide plate and the lower conical guide plate are all fixed on the inner wall of the heat exchange furnace.
6. The system for recycling the smelting slag multistage waste heat with high efficiency as recited in claim 4, wherein a recuperative furnace air outlet is arranged at the top of the recuperative furnace, the recuperative furnace air outlet is communicated with the first dust remover through a flue gas pipeline, a recuperative furnace air inlet pipe is arranged at the bottom of the recuperative furnace, the recuperative furnace air inlet pipe is communicated with the buffer tank, and a blast cap is arranged at the top of the recuperative furnace air inlet pipe.
7. The system for efficiently recycling the multi-stage waste heat of the smelting slag according to claim 5, wherein a plurality of groups of discharging through holes are formed in the upper conical guide plate, the middle conical guide plate and the lower conical guide plate.
8. The system for efficiently recycling the multi-stage waste heat of the smelting slag according to claim 1, wherein a gas-water heat exchanger coil is arranged in the gas-water heat exchanger, one end of the gas-water heat exchanger coil is communicated with the water storage tank through a water pipe, and the other end of the gas-water heat exchanger coil is communicated with the steam drum through a flue gas pipeline.
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| CN202210485241.4A CN114777508A (en) | 2022-05-06 | 2022-05-06 | Multi-stage waste heat efficient recycling system for smelting slag |
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| CN202210485241.4A CN114777508A (en) | 2022-05-06 | 2022-05-06 | Multi-stage waste heat efficient recycling system for smelting slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116379789A (en) * | 2023-04-17 | 2023-07-04 | 江苏大学 | Spodumene lithium extraction waste heat recovery process and waste heat recovery device based on heat energy storage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116379789A (en) * | 2023-04-17 | 2023-07-04 | 江苏大学 | Spodumene lithium extraction waste heat recovery process and waste heat recovery device based on heat energy storage |
| CN116379789B (en) * | 2023-04-17 | 2023-11-21 | 江苏大学 | Spodumene lithium extraction waste heat recovery process and waste heat recovery device based on heat energy storage |
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