CN109457070B - Steam whitening and heat energy recovery system for blast furnace water slag process - Google Patents
Steam whitening and heat energy recovery system for blast furnace water slag process Download PDFInfo
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- CN109457070B CN109457070B CN201811610070.3A CN201811610070A CN109457070B CN 109457070 B CN109457070 B CN 109457070B CN 201811610070 A CN201811610070 A CN 201811610070A CN 109457070 B CN109457070 B CN 109457070B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 208
- 239000002893 slag Substances 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000008569 process Effects 0.000 title claims abstract description 29
- 238000011084 recovery Methods 0.000 title claims abstract description 20
- 230000002087 whitening effect Effects 0.000 title claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 42
- 238000011010 flushing procedure Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims description 30
- 239000000203 mixture Substances 0.000 claims description 17
- 238000005507 spraying Methods 0.000 claims description 15
- 238000005469 granulation Methods 0.000 claims description 9
- 230000003179 granulation Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 abstract description 6
- 239000011593 sulfur Substances 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 10
- 239000002918 waste heat Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 239000008247 solid mixture Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
-
- 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
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
-
- 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
- Y02P10/20—Recycling
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
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- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The application discloses a blast furnace water slag process steam whitening and heat energy recovery system, which comprises a granulating tower (1), a chimney (7), a filtering tank (43), a hot water heat exchange unit, a cooling tower (44) and a water storage tank (45) which are sequentially connected in series, wherein a first steam heat exchanger (13) is connected outside the filtering tank (43), and a movable steam hood (16) is arranged at the top of the filtering tank (43). The blast furnace water slag process steam whitening and heat energy recovery system can fully recover steam heat energy in the granulating process, can also recover heat energy of slag flushing water and steam in the filter tank, simultaneously reduces the working load of the cooling tower, can also reduce the emission of sulfur-containing steam in the slag treatment process, and really realizes energy conservation and emission reduction and effective recycling of energy sources.
Description
Technical Field
The application relates to the field of iron making in the metallurgical industry, in particular to a steam whitening and heat energy recovery system for a blast furnace water slag process.
Background
High-temperature liquid slag (1350 ℃ -1500 ℃) is generated during blast furnace smelting, 7 hundred million tons of molten iron is produced annually in China, and 2.5 hundred million tons of high-temperature liquid slag are generated. Related researches have been carried out for many years at home and abroad, and it is hoped to fully utilize the heat of blast furnace slag to realize waste heat recovery and utilization.
Chinese patent CN106282445B, publication date 2017 1 month 4, discloses a device and a recovery method for recovering waste heat of blast furnace slag, the method utilizes metal balls to be mixed with high-temperature liquid slag to obtain a solid mixture of the blast furnace slag and the metal balls at 500-800 ℃, the mixture is crushed and separated by rotating a metal cage, recycling of slag fragments obtained by the method is difficult, the crushing and separation of the solid mixture of the blast furnace slag and the metal balls at 500-800 ℃ are finished in the rotating metal cage, abrasion to the metal cage at high temperature can be serious, and service life of equipment and operation rate of the whole system can be seriously influenced.
Slag is generally treated by adopting a sediment filtration method (commonly called bottom filtration method) water slag process at home and abroad. Hydraulic slag flushing is carried out in front of a blast furnace, after the slag is crushed by water quenching, the slag becomes a loose slag-water mixture (commonly called water slag), the water slag enters a filtering tank through a slag flushing ditch, liquid water is filtered through a filtering layer in the filtering tank, solid moist slag particles are left at the bottom of the filtering tank, and then the slag particles are grabbed and loaded and transported outside through a bridge grab crane. The slag particles (particle size of 0.2-3 mm) obtained after water quenching have wide application, and can be used as cement materials, heat insulation fillers and the like, so that the slag is fully utilized.
The blast furnace slag flushing water (about 70-90 ℃) is used as a low-temperature waste heat source, has the characteristics of stable temperature and large flow, and for waste heat utilization of slag flushing water, china patent CN207585372U, publication date 2018, 7 month and 6 days, discloses a 'blast furnace slag flushing water waste heat utilization system', the system leads slag flushing water to a circulating tank through a lifting pump and a drainage tube, the circulating tank is connected with a heating pump, a water outlet of the heating pump is connected with a sintering mixing water pipeline through a water supply pipe, the circulating tank is also connected with a concentrated brine discharge pipeline of a power plant through a first pipeline, and waste heat of redundant water is fully utilized and then injected into the circulating tank for recycling through a heat exchanger. The system leads the slag flushing water from the water tank to the circulating tank and adopts other measures to carry out waste heat utilization, so that a large amount of heat can be lost, and the heat recovery of the slag flushing water is not facilitated.
Patent CN207121610U, publication date 2018, 3 and 20, discloses a "blast furnace slag flushing water vapor waste heat recycling system", which uses an exhaust device to collect slag flushing water vapor, then conveys the slag flushing water vapor to a vapor heat accumulator and a lithium bromide refrigeration water unit through a vapor reheating device, and finally condenses the vapor into condensed water and generates refrigeration water. The system needs to be additionally matched with a large amount of equipment such as an exhaust device, a steam reheating device, a steam heat accumulator, a steam-liquid heat exchanger and the like on the basis of the original water slag system, and has complex flow and high equipment investment; in the system, a large amount of slag flushing water (about 70-90 ℃) and slag particles obtained after slag water quenching enter a slag flushing water circulating water tank, and other part of vapor (about 60-100 ℃) cannot be trapped by an exhaust hood and can enter the circulating water tank along a pipeline, so that the heat of the slag flushing water and the vapor in the circulating water tank cannot be fully recycled.
Patent CN101265039B, publication date 2008, 9 and 17, discloses an environment-friendly bottom filtering method blast furnace slag treatment device and a treatment method, and the method can reduce slag flushing water quantity, reduce water consumption, improve filtering speed and reduce occupied area of a filtering tank. In the method, the slag flushing water passes through a filter tube and is directly pumped to a cooling tower by an upper tower pump for cooling, so that the heat energy of the slag flushing water is wasted, and the work load of the cooling tower is increased.
From the above analysis, although the prior art has provided a method for recovering heat energy from a filtering tank of a blast furnace water slag system, various defects in different degrees and different aspects remain to be solved, and a new method for recovering heat energy from a filtering tank of a blast furnace water slag system is necessary to be studied, so that effective recycling of energy sources and reduction of air pollution are realized.
In the blast furnace slag treatment process, a large amount of high-temperature steam exists in the granulating process, slag flushing water with stable temperature and large flow rate exists in the filtering tank, and long-term steam exists on the surface of the filtering tank during slag flushing, so that the heat energy of the slag flushing water and the steam is recovered, and the reduction of the air emission of sulfur-containing steam is of great significance for energy conservation and emission reduction.
Disclosure of Invention
In order to recover heat energy in blast furnace granulated slag, the application provides a blast furnace granulated slag process steam whitening and heat energy recovery system, which can fully recover steam heat energy in the granulating process, can also recover heat energy of slag flushing water and steam in a filter tank, simultaneously reduces the working load of a cooling tower, can also reduce the emission of sulfur-containing steam in a slag treatment process, and really realizes energy conservation and emission reduction and effective recycling of energy.
The application solves the technical problems that: a blast furnace water slag process steam whitening and heat energy recovery system comprises a granulating tower, a chimney, a filter tank, a hot water heat exchange unit, a cooling tower and a water storage tank which are sequentially connected in series, wherein a first steam heat exchanger is connected outside the filter tank, and a movable steam hood is arranged at the top of the filter tank.
The granulating tower is internally provided with a granulator and a second steam heat exchanger, the granulator is positioned below a high-temperature slag inlet of the granulating tower, the second steam heat exchanger is positioned at the upper part of the granulating tower, and the high-temperature slag inlet of the granulating tower is positioned between the second steam heat exchanger and the granulator.
The lower part of the granulating tower is connected with the chimney through a first slag-water mixture pipeline, the top of the granulating tower is connected with the chimney through a steam pipeline, a first induced draft fan is arranged on the steam pipeline, and the joint of the steam pipeline and the granulating tower is positioned above the second steam heat exchanger.
The chimney is internally and sequentially provided with a spraying device, a demister and a back flushing device from bottom to top, the joint of the steam pipeline and the chimney is positioned below the spraying device, the spraying device comprises long spray guns and short spray guns which are uniformly and alternately arranged along the circumferential direction of the chimney, and a plurality of high-pressure spray heads are uniformly arranged on the long spray guns and the short spray guns.
The lower part of the chimney is connected with the filtering tank through a second slag-water mixture pipeline, the upper part of the filtering tank is provided with a steam discharge port, the steam discharge port is connected with the first steam heat exchanger through a steam conveying pipeline, and the steam conveying pipeline is provided with a second induced draft fan.
The high-temperature steam exhausted from the filter tank can enter the first steam heat exchanger to release heat, the high-temperature steam can enter the chimney after releasing heat or return to the filter tank, the first steam heat exchanger is connected with a first heat exchange pipeline, and a first heat exchange medium in the first heat exchange pipeline can absorb heat in the first steam heat exchanger and enter a user pipe network after absorbing heat.
The hot water heat exchange unit comprises a first hot water heat exchanger and a second hot water heat exchanger, the first hot water heat exchanger and the second hot water heat exchanger are connected in series or in parallel, the first hot water heat exchanger and the second hot water heat exchanger are both arranged in a water pump room, and the water pump room is positioned between the filter tank and the water storage tank.
The high-temperature filtered water flowing out of the filter tank can release heat in the first hot water heat exchanger and the second hot water heat exchanger, the first hot water heat exchanger and the second hot water heat exchanger are connected with a second heat exchange pipeline, and a second heat exchange medium in the second heat exchange pipeline can absorb heat in the first hot water heat exchanger and the second hot water heat exchanger and enter a user pipe network after absorbing heat.
The cooling tower is located the top of tank, and the tank passes through the water pipeline and is connected with granulation tower and chimney, and the bottom export of filtering ponds is connected with the filtered water detection and analysis unit outward, and this filtered water detection and analysis unit can detect quality of water, temperature and flow of filtered water.
The beneficial effects of the application are as follows:
1. the application can fully return the heat energy of the steam in the slag treatment process and the slag flushing water in the filtering tank, thereby realizing the effective recycling of energy sources.
2. The application provides a measure of steam treatment by heat exchange and then spraying, which can reduce the emission of sulfur-containing steam in the slag treatment process and reduce air pollution.
3. The temperature of the high-temperature filtered water is reduced after the high-temperature filtered water is treated by the heat exchanger, so that the working load of a cooling tower can be reduced, and high-efficiency cooling is realized.
4. The application adopts the unpowered heat exchanger and has the advantages of low operation cost and high benefit.
5. The application detects and analyzes the quality of the filtered water, detects the temperature and flow of the filtered water, and feeds back all detection results to the blast furnace central control system in time, thereby playing an important role in optimizing the quality and proportion of raw fuel of the blast furnace, optimizing the operation of the blast furnace and promoting the forward running of the blast furnace.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
Fig. 1 is a general schematic diagram of a blast furnace grain slag process steam whitening and heat energy recovery system.
Fig. 2 is a top view of the spray device.
1. A granulating tower; 2. a second steam heat exchanger; 3. a granulator; 4. a first induced draft fan; 5. a steam pipe; 6. a first slag-water mixture pipeline; 7. a chimney; 8. a back flushing device; 9. a demister; 10. a spraying device; 11. a second slag-water mixture pipeline; 12. a filter tank steam pipe; 13. a first steam heat exchanger; 14. a first electric butterfly valve; 15. a first manual butterfly valve; 16. a movable steam shield; 17. a second manual butterfly valve; 18. a second electric butterfly valve; 19. a first one-way valve; 20. a third manual butterfly valve; 21. a third electric butterfly valve; 22. a thermometer; 23. a flow meter; 24. a fourth manual butterfly valve; 25. a hot water pump; 26. a second one-way valve; 27. a fourth electric butterfly valve; 28. a fifth manual butterfly valve; 29. a first hot water heat exchanger; 30. a second hot water heat exchanger; 31. a tower pump is arranged; 32. a sixth manual butterfly valve; 33. a seventh manual butterfly valve; 34. a slag flushing pump; 35. a third one-way valve; 36. a fifth electric butterfly valve; 37. an eighth manual butterfly valve; 38. a long spray gun; 39. a short lance; 40. a high pressure nozzle; 41. a second induced draft fan; 42. a user pipe network; 43. a filtering tank; 44. a cooling tower; 45. a water storage tank; 46. a water pump house.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The utility model provides a blast furnace grain slag technology steam whitening and heat recovery system, includes granulation tower 1, chimney 7, filtering ponds 43, hot water heat transfer unit, cooling tower 44, the tank 45 that establish ties in proper order, and filtering ponds 43 are connected with first steam heat exchanger 13 outward, and the top of filtering ponds 43 is equipped with movable steam hood 16, as shown in figure 1.
In the present embodiment, the granulating tower 1 is provided therein with the granulator 3 and the second steam heat exchanger 2, the granulator 3 is located below the high-temperature slag inlet of the granulating tower 1, the second steam heat exchanger 2 is located at the upper portion of the granulating tower 1, and the high-temperature slag inlet of the granulating tower 1 is located between the second steam heat exchanger 2 and the granulator 3. The granulator is positioned below the inlet of high-temperature slag of the granulating tower, and the steam heat exchanger is positioned above the granulator and near the top of the granulating tower.
In this embodiment, the lower part of the granulation tower 1 is connected with the chimney 7 through the first slag-water mixture pipeline 6, the top of the granulation tower 1 is connected with the chimney 7 through the steam pipeline 5, the steam pipeline 5 is provided with the first induced draft fan 4, and the joint of the steam pipeline 5 and the granulation tower 1 is located above the second steam heat exchanger 2. The uncondensed steam in the granulating tower is introduced into the chimney from a steam pipeline on the side of the top of the granulating tower by an induced draft fan.
In this embodiment, the spraying device 10, the demister 9 and the backwashing device 8 are sequentially arranged in the chimney 7 from bottom to top, one or more layers of spraying devices 10 can be arranged, the joint of the steam pipeline 5 and the chimney 7 is located below the spraying device 10, the spraying device 10 comprises long spray guns 38 and short spray guns 39 which are uniformly and alternately arranged along the circumferential direction of the chimney 7, and a plurality of high-pressure spray heads 40 are uniformly arranged on the long spray guns 38 and the short spray guns 39, as shown in fig. 2.
In the present embodiment, the lower part of the chimney 7 is connected to the filter tank 43 through the second slag-water mixture pipe 11, and the upper part of the filter tank 43 is provided with a steam discharge port, which is connected to the first steam heat exchanger 13 through a steam transfer line, and the steam transfer line is provided with a second induced draft fan 41. A filter tank steam pipeline 12 is also arranged between the chimney 7 and the first steam heat exchanger 13.
The movable steam cover is arranged at the top of the filtering tank, and the movable steam cover seals the filtering tank during slag flushing, so that the discharge of sulfur-containing steam to the air is avoided; after slag flushing is stopped, the steam cover is removed, so that slag particles in the filtering tank can be cleaned conveniently in slag grabbing operation. An induced draft fan is arranged between the filter tank and the chimney, and steam on the surface of the filter tank is pumped away and then enters the steam heat exchanger.
In this embodiment, the high-temperature steam discharged from the filtering tank 43 can enter the first steam heat exchanger 13 to release heat, the high-temperature steam can enter the chimney 7 after releasing heat or return to the filtering tank 43, the first steam heat exchanger 13 is connected with a first heat exchange pipeline, and a first heat exchange medium (such as water or other medium) in the first heat exchange pipeline can absorb heat in the first steam heat exchanger 13 and enter the user pipe network 42 after absorbing heat.
When the blast furnace washes slag, the slag water mixture carries steam to enter the filtering tank, a movable steam cover is arranged on the filtering tank, steam on the surface of the filtering tank and high-temperature filtered water at the bottom of the filtering tank are respectively led out during slag washing, and heat energy recovery of the filtering tank is realized through heat exchange action of the steam heat exchanger and the hot water heat exchanger, so that air discharge of steam is avoided. When the blast furnace stops flushing slag and slag particles in the filtering tank need to be cleaned, the steam cover is removed to facilitate slag grabbing operation.
In this embodiment, the hot water heat exchange unit includes a first hot water heat exchanger 29 and a second hot water heat exchanger 30, where the first hot water heat exchanger 29 and the second hot water heat exchanger 30 are connected in series or parallel (in fig. 1, connected in series), the first hot water heat exchanger 29 and the second hot water heat exchanger 30 are both disposed in a water pump room 46, and the water pump room 46 is located between the filter tank 43 and the water storage tank 45.
In the present embodiment, the high temperature filtered water flowing out of the filtering ponds 43 can release heat in the first hot water heat exchanger 29 and the second hot water heat exchanger 30, and the first hot water heat exchanger 29 and the second hot water heat exchanger 30 are connected with a second heat exchange pipeline, and a second heat exchange medium (such as the warm water or other medium) in the second heat exchange pipeline can absorb heat in the first hot water heat exchanger 29 and the second hot water heat exchanger 30 and enter the user pipe network 42 after absorbing heat, as shown in fig. 2.
In this embodiment, the cooling tower 44 is located above the water storage tank 45, the water storage tank 45 is connected to the granulating tower 1 and the chimney 7 through a water pipe, and a filtered water detection and analysis unit capable of detecting the quality, temperature and flow rate of filtered water is connected to the outside of the bottom outlet of the filtering tank 43, and contains the thermometer 22 and the flowmeter 23.
The temperature of the high-temperature filtered water is reduced to low-temperature filtered water under the action of the heat exchanger, the low-temperature filtered water enters a cooling tower for further cooling and then enters a water storage tank to be used as low-temperature slag flushing water, and the recycling of the filtered water is realized. At the outlet of the bottom of the filter tank, the quality of the filtered water is detected and analyzed, the temperature and flow of the filtered water are detected, all detection results are fed back to a blast furnace central control system in time, the quality and the proportion of raw fuel of the blast furnace are optimized, the operation of the blast furnace is optimized, and the forward running of the blast furnace is promoted.
The working process of the steam whitening and heat energy recovery system of the blast furnace granulated slag process is described below.
A granulator 3 is arranged below the inlet of the high-temperature slag of the granulating tower 1, the high-temperature slag completes granulation under the action of a large amount of high-speed granulating water, and the slag-water mixture falls into the bottom of the granulating tower 1. The bottom of the granulating tower 1 is introduced with conveying water, and the slag-water mixture enters the bottom of the chimney 7 under the action of the conveying water.
A second steam heat exchanger 2 is arranged above the granulator 3 and close to the top of the granulating tower 1, and a steam pipeline 5 and a first induced draft fan 4 are arranged on the side surface of the top of the granulating tower. Under the action of the first induced draft fan 4, steam (about 80-100 ℃) generated in the slag granulating process moves upwards in the granulating tower, when the steam passes through the second steam heat exchanger 2, normal-temperature water (about 25-35 ℃) which is introduced into the heat exchanger absorbs a large amount of heat energy to become hot water (about 60-80 ℃), and a large amount of steam is condensed into water drops falling into the bottom of the granulating tower 1 in the heat exchange process. The non-condensed steam enters the chimney 7 from the steam pipe 5 at the top side of the granulation tower 1.
A layer (or layers) of spraying device 10, a foam remover 9 and a back flushing device 8 are sequentially arranged above the outlet of the steam pipeline 5 of the granulating tower in the chimney 7.
The spray device 10 is composed of a plurality of long spray guns 38 and short spray guns 39 which are uniformly and crosswise arranged at the same height in the chimney, and a plurality of high-pressure spray heads 40 are uniformly arranged on the long spray guns and the short spray guns. Depending on the process requirements, several levels of long and short lances 38, 39 and their attendant high pressure jets 40 may be arranged at different heights. After sprayed from the high-pressure spray head 40, spray water forms an atomization state in the chimney 7, and the atomized spray water is uniformly distributed in the inner space of the chimney.
After entering the chimney 7, the uncondensed steam becomes condensed water under the action of atomized spray water, and the condensed water and the spray water fall into the bottom of the chimney 7 together. The demister 9 is arranged above the spraying device 10 and used for eliminating uncondensed steam and small water drops; the back flushing device 8 regularly back flushes the demister 9, so that the demister 9 is prevented from being blocked after long-term use.
After the slag-water mixture led out from the granulating tower 1 enters a chimney 7, the slag-water mixture enters a filter tank together with condensed water and spray water at the bottom of the chimney. A movable steam cover 16 is arranged at the top of the filtering tank to seal steam on the surface of the filtering tank; the movable steam hood 16 is moved away after the slag flushing is stopped to facilitate slag grasping.
Steam on the surface of the filter tank is led out through an opening at a position close to the top of the chimney 7 on the side wall of the filter tank. A second induced draft fan 41 is arranged outside the side wall opening of the filter tank. Under the action of the negative pressure of the second induced draft fan 41 and the sealing of the movable steam hood 16, steam on the surface of the filter tank is pumped out of the filter tank and enters the first steam heat exchanger 13.
The hot water (about 25-35 ℃) or other mediums to be heated are heated by the first steam heat exchanger 13 and then enter the user pipe network 42 (about 60-70 ℃), most of steam is condensed into water drops under the action of the first steam heat exchanger 13, the water drops enter the filter tank 43 together with the slag-water mixture, and the small part of steam is not condensed into the chimney 7 and becomes water drops under the action of the spraying device 10 in the chimney 7, and falls into the bottom of the chimney 7 and enters the filter tank 43 through the second slag-water mixture pipeline 11.
The first hot water heat exchanger 29 and the second hot water heat exchanger 30 are arranged in the water pump room 46, the two heat exchangers are connected in series, high-temperature filtered water (about 70-90 ℃) flows out from the bottom of the filtering tank and then sequentially passes through the first hot water heat exchanger 29 and the second hot water heat exchanger 30, and the heating of the hot water is completed in the heat exchange process.
The warm water (about 25-35 ℃) is heated by the first hot water heat exchanger 29 and the second hot water heat exchanger 30 to become hot water (about 60-70 ℃), and then enters the user pipe network 42 through the first check valve 19, the second electric butterfly valve 18 and the second manual butterfly valve 17. The high temperature filtered water enters the first hot water heat exchanger 29 and the second hot water heat exchanger 30 after passing through the hot water pump 25, the second one-way valve 26, the fourth electric butterfly valve 27 and the fifth manual butterfly valve 28, and the temperature is reduced to low temperature filtered water (about 50 ℃ to 60 ℃) under the action of the heat exchangers.
The low-temperature filtered water enters a cooling tower through an upper tower pump 31 and a sixth manual butterfly valve 32, and is cooled to become cooling water (about 40-45 ℃) and enters a water storage tank 45 for storage for standby. When slag flushing is needed, cooling water is led out from the bottom of the water storage tank 45, power is lifted by the slag flushing pump 34, and then the cooling water is used as low-temperature slag flushing water, spray water and conveying water to be led to corresponding positions by the third one-way valve 35, the fifth electric butterfly valve 36 and the eighth manual butterfly valve 37, so that the recycling of filtered water is realized.
The change of the quality and the proportion of the raw fuel of the blast furnace can lead to the change of the components of the slag of the blast furnace, thereby changing the quality of the filtered water. At the outlet of the bottom of the filter tank, the water quality of the filtered water flowing out after being filtered by the filter layer is detected and analyzed, meanwhile, a thermometer 22 and a flowmeter 23 are installed, the temperature and the flow of the filtered water are detected, all detection results are fed back to a blast furnace central control system in time, and the method plays an important role in optimizing the quality and the proportion of raw fuel of the blast furnace, optimizing the operation of the blast furnace and promoting the forward running of the blast furnace.
The hot water heated by the heat exchanger (about 60-70 ℃) has wide application, can be used for shower bath of a living water system and heating in winter after being introduced into a user pipe network, and can also be used for humidifying and preheating materials of an industrial water system. The granulating steam of slag and the heat energy of slag flushing water and steam in the filtering tank are effectively recovered, and the air discharge of sulfur-containing steam is reduced, so that the method has great significance for energy conservation and emission reduction.
The foregoing description of the embodiments of the application is not intended to limit the scope of the application, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the application shall fall within the scope of the patent. In addition, the technical features and the technical features, the technical features and the technical application can be freely combined for use.
Claims (6)
1. The blast furnace water slag process steam whitening and heat energy recovery system is characterized by comprising a granulating tower (1), a chimney (7), a filter tank (43), a hot water heat exchange unit, a cooling tower (44) and a water storage tank (45) which are sequentially arranged in series, wherein the filter tank (43) is externally connected with a first steam heat exchanger (13), and the top of the filter tank (43) is provided with a movable steam cover (16);
a granulator (3) and a second steam heat exchanger (2) are arranged in the granulating tower (1), the granulator (3) is positioned below a high-temperature slag inlet of the granulating tower (1), the second steam heat exchanger (2) is positioned at the upper part of the granulating tower (1), and the high-temperature slag inlet of the granulating tower (1) is positioned between the second steam heat exchanger (2) and the granulator (3);
the top of the granulating tower (1) is connected with a chimney (7) through a steam pipeline (5), and a first induced draft fan (4) is arranged on the steam pipeline (5);
a spraying device (10), a foam remover (9) and a back flushing device (8) are sequentially arranged in the chimney (7) from bottom to top, and the joint of the steam pipeline (5) and the chimney (7) is positioned below the spraying device (10);
the lower part of the chimney (7) is connected with the filter tank (43) through a second slag-water mixture pipeline (11), the upper part of the filter tank (43) is provided with a steam discharge port, the steam discharge port is connected with the first steam heat exchanger (13) through a steam conveying pipeline, and the steam conveying pipeline is provided with a second induced draft fan (41);
the high-temperature steam discharged from the filter tank (43) can enter the first steam heat exchanger (13) to release heat, and the high-temperature steam can enter the chimney (7) or return to the filter tank (43) after releasing heat;
the hot water heat exchange unit comprises a first hot water heat exchanger (29) and a second hot water heat exchanger (30), the first hot water heat exchanger (29) and the second hot water heat exchanger (30) are arranged in series or in parallel, the first hot water heat exchanger (29) and the second hot water heat exchanger (30) are arranged in a water pump room (46), and the water pump room (46) is located between a filter tank (43) and a water storage tank (45).
2. The blast furnace slag process steam whitening and heat energy recovery system according to claim 1, characterized in that the lower part of the granulation tower (1) is connected with the chimney (7) through a first slag-water mixture pipe (6), the junction of the steam pipe (5) and the granulation tower (1) being located above the second steam heat exchanger (2).
3. The blast furnace slag process steam whitening and heat energy recovery system according to claim 2, wherein the spraying device (10) comprises long spray guns (38) and short spray guns (39) which are uniformly and alternately arranged along the circumferential direction of the chimney (7), and a plurality of high-pressure spray heads (40) are uniformly arranged on the long spray guns (38) and the short spray guns (39).
4. The blast furnace slag process steam whitening and heat energy recovery system according to claim 1, characterized in that the first steam heat exchanger (13) is connected with a first heat exchange line, the first heat exchange medium in the first heat exchange line being able to absorb heat in the first steam heat exchanger (13) and after absorbing heat to enter the user pipe network (42).
5. The blast furnace slag process steam whitening and heat energy recovery system according to claim 1, characterized in that the high temperature filtered water flowing out of the filter tank (43) can release heat in the first hot water heat exchanger (29) and the second hot water heat exchanger (30), the first hot water heat exchanger (29) and the second hot water heat exchanger (30) being connected with a second heat exchange line, the second heat exchange medium in the second heat exchange line being able to absorb heat in the first hot water heat exchanger (29) and the second hot water heat exchanger (30) and enter the user pipe network (42) after absorbing heat.
6. The blast furnace slag process steam whitening and heat energy recovery system according to claim 1, wherein the cooling tower (44) is located above the water storage tank (45), the water storage tank (45) is connected with the granulating tower (1) and the chimney (7) through a water conveying pipeline, and a filtered water detection and analysis unit is connected to the outside of the bottom outlet of the filtering tank (43) and can detect the quality, temperature and flow of filtered water.
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| CN110093464A (en) * | 2019-04-16 | 2019-08-06 | 浙江菲达环保科技股份有限公司 | A kind of blast furnace slag flushing residual heat heating and steam disappear white system and method |
| CN110132024B (en) * | 2019-04-16 | 2021-03-19 | 浙江菲达环保科技股份有限公司 | Waste heat utilization and white matter elimination system and method for blast furnace water slag flushing process |
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| CN113832265A (en) * | 2021-08-06 | 2021-12-24 | 中冶南方工程技术有限公司 | Blast furnace quenching slag steam whitening technology and device |
| CN115216600B (en) * | 2022-07-19 | 2024-04-26 | 南京青述节能技术有限公司 | High-temperature high-pressure water quenching molten slag waste heat recovery device |
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