CN112725553A - High-temperature liquid dilute slag quenching dry type granulation and waste heat recovery system - Google Patents
High-temperature liquid dilute slag quenching dry type granulation and waste heat recovery system Download PDFInfo
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- CN112725553A CN112725553A CN202110180715.XA CN202110180715A CN112725553A CN 112725553 A CN112725553 A CN 112725553A CN 202110180715 A CN202110180715 A CN 202110180715A CN 112725553 A CN112725553 A CN 112725553A
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- 239000002893 slag Substances 0.000 title claims abstract description 109
- 239000002918 waste heat Substances 0.000 title claims abstract description 65
- 238000011084 recovery Methods 0.000 title claims abstract description 51
- 238000010791 quenching Methods 0.000 title claims abstract description 41
- 230000000171 quenching effect Effects 0.000 title claims abstract description 40
- 239000007788 liquid Substances 0.000 title claims abstract description 30
- 238000005469 granulation Methods 0.000 title claims abstract description 26
- 230000003179 granulation Effects 0.000 title claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 48
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000001816 cooling Methods 0.000 claims abstract description 45
- 239000003546 flue gas Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000003860 storage Methods 0.000 claims abstract description 35
- 238000001914 filtration Methods 0.000 claims abstract description 22
- 238000009826 distribution Methods 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 238000005338 heat storage Methods 0.000 claims description 12
- 230000008016 vaporization Effects 0.000 claims description 10
- 238000009834 vaporization Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 239000008234 soft water Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000007908 dry granulation Methods 0.000 claims 9
- 238000004134 energy conservation Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
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- 230000008020 evaporation Effects 0.000 abstract 2
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- 238000011010 flushing procedure Methods 0.000 description 5
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/052—Apparatus features including rotating parts
- C21B2400/054—Disc-shaped or conical parts for cooling, dispersing or atomising of molten slag rotating along vertical axis
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
-
- 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
- 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
Abstract
The invention discloses a rapid cooling dry type granulation and waste heat recovery system for high-temperature liquid dilute slag, and belongs to the technical field of high-temperature liquid dilute slag. The technical scheme is characterized by comprising a feeding device, a dry type quenching granulation treatment device, a full waste heat recovery water vapor system, a constant temperature flue gas filtering device and a fin waste heat recovery device; the dry type rapid cooling granulation treatment device comprises a storage bin, a centrifugal granulation turntable device and a wind quenching device, wherein the upper part of the storage bin is communicated with an evaporation cooling flue, and flue gas in molten slag enters a constant-temperature flue gas filtering device through the evaporation cooling flue; and the full waste heat recovery water vapor system recovers the waste heat in the slag. The invention realizes the replacement of the heat of the high-temperature liquid dilute slag into the internal energy of the flue gas, can also be used in the fields of heat supply, water supply, gas supply and the like of waste heat boilers, really realizes the cyclic utilization of clean energy and achieves the purposes of energy conservation and environmental protection.
Description
Technical Field
The invention relates to the technical field of high-temperature liquid dilute slag, in particular to a rapid cooling dry type granulating and waste heat recovery system for the high-temperature liquid dilute slag.
Background
China is the largest iron and steel producing country in the world at present, the iron and steel yield is continuously maintained for more than 20 years and is about more than 60 percent of the total world yield.
Blast furnace slag containing huge heat is generated in the process of smelting pig iron. The tapping temperature of the blast furnace slag is generally 1400-1550 ℃, each ton of slag contains 1260-1880 multiplied by 103kJ sensible heat, which is equivalent to 60kg of standard coal. Under the existing smelting technology in China, 0.3 ton of blast furnace slag is produced as a byproduct for producing 1 ton of pig iron, the blast furnace slag with the pig iron yield of 8.09 million tons in China in 2019 can be folded to produce more than 2.43 million tons of blast furnace slag, and the sensible heat of the blast furnace slag is equivalent to 1458 ten thousand tons of standard coal.
The dry slag pit cooling method and the water slag flushing method are the most common blast furnace slag treatment methods in China at present. The dry slag pit cooling method directly discharges high-temperature liquid slag into a dry slag pit for air cooling and auxiliary water cooling. When the method is used for cooling, a large amount of water vapor is generated, and a large amount of H is released simultaneously2S and SO2Gases, corrosion of buildings, destruction of equipment and deterioration of the working environment, which is generally used only in the event of accident. 90% of blast furnace slag in China is treated by a water flushing slag method. The slag flushing method is that low-temperature cooling water is directly mixed with high-temperature liquid slag, so that the temperature of the liquid slag is rapidly reduced and vitreous slag particles are formed. The water-slag-flushing method can be divided into a Ciba method, a Tura method, a bottom filtration method, a Lasa method and a Mintck method according to different process flows. Although the water-jet process is continuously developed, the core of the technology is to spray water and quench high-temperature liquid slag to achieve the purposes of cooling and granulating, then carry out water-slag separation, and recycle the water for slag flushing after precipitation and filtration, but the treatment process wastes a large amount of water resources and generates H2S and SO2And the harmful gases cause serious smoke plume problems, and high-quality waste heat resources contained in the high-temperature liquid slag cannot be effectively recovered.
The necessity of utilizing the heat energy of the high-temperature slag is mainly reflected in energy conservation and emission reduction, energy waste is reduced, meanwhile, great comprehensive benefits are achieved in the aspects of environmental protection and the like, the sensible heat of the blast furnace slag, the converter slag, the electric furnace slag and the like is recovered with high quality and high efficiency, the sensible heat can also become an important means for reducing comprehensive energy consumption of iron and steel enterprises, and low-carbon economy is achieved while great economic benefits are brought to the enterprises.
The high-temperature liquid diluted slag is a byproduct generated in the steel-making process, and the treatment method of the high-temperature liquid diluted slag mainly comprises the following steps: the cold discard method, the hot pour method, the disc water cooling method, the water quenching method, the air quenching method, the slag smoldering method, and the like, which are all techniques of cooling, solidifying and granulating the molten steel slag by using air and water. Therefore, the heat energy of the steel slag is completely released into the air and cannot be recycled, so that the environment is polluted and energy waste is caused.
In summary, the treatment process commonly adopted by the high-temperature liquid diluted molten slag at present not only wastes all high-quality waste heat resources contained in the high-temperature liquid molten slag, but also consumes a large amount of water resources, and causes serious pollution to the environment, and the treatment modes are not suitable for the urgent requirements of energy conservation and emission reduction in the steel industry at present. An efficient and pollution-free new technology must be found for effectively recovering the blast furnace slag waste heat resources.
With the continuous development of the steel industry, the production amount of steel slag is continuously increased. Therefore, the improvement of the capability and the technical level of steel slag treatment is not only an important content of national energy conservation and emission reduction and circular economy, but also 1 important measure of improving the steelmaking production capability, reducing the smelting cost and realizing the comprehensive utilization of the steel slag.
Disclosure of Invention
The invention aims to provide a high-temperature liquid dilute slag quenching dry type granulation and waste heat recovery system, which is used for filtering and purifying high-temperature flue gas and recovering waste heat; on the other hand, the slag is cooled, wind quenching is assisted on the basis of centrifugal treatment, and the slag is crushed by using mechanical force and wind power at the same time, so that the defects of high energy consumption and large wind quantity of a pure wind quenching and granulating process are avoided, and the vitrification rate of the slag after quenching and granulating is effectively improved; and the heat of the high-temperature liquid dilute slag is replaced by the internal energy of the flue gas, the heat energy utilization rate of the slag is improved, the slag waste heat can be used for power generation, and can also be used in the fields of heat supply, water supply, gas supply and the like of a waste heat boiler, so that the recycling of clean energy is really realized, and the purposes of energy conservation and environmental protection are achieved.
The technical purpose of the invention is realized by the following technical scheme:
a high-temperature liquid dilute slag quenching dry type granulation and waste heat recovery system comprises a feeding device, a dry type quenching granulation treatment device, a full waste heat recovery water vapor system, a constant-temperature flue gas filtering device and a fin waste heat recovery device; the feeding device comprises an inlet groove and a chute, and the chute is connected below the inlet groove; the dry type rapid cooling granulation treatment device comprises a storage bin, a centrifugal granulation turntable device and an air quenching device, wherein the centrifugal granulation device is arranged in the middle of the storage bin, and the air quenching device is used for conveying nitrogen or air into the centrifugal granulation device;
the feeding groove is arranged on the side wall of the storage bin, and the molten slag enters the storage bin through the feeding groove; the upper part of the storage bin is communicated with a vaporization cooling flue, and flue gas in the molten slag enters a constant-temperature flue gas filtering device through the vaporization cooling flue; the upper part of the high-temperature flue gas filtering device is connected with a gas conveying pipe, and the filtered flue gas enters the fin waste heat recovery device through the gas conveying pipe; the dry quenching and granulating treatment device is communicated with a full waste heat recovery water vapor system through a plurality of connecting pipes, and the full waste heat recovery water vapor system recovers waste heat in the molten slag.
Further, the feeding device comprises a double-station pouring device, and the double-station pouring device is used for conveying molten slag into the inlet groove.
Further, a fluidized bed cooling device and a uniform discharging device are arranged at the lower part of the storage bin; one side of the fluidized bed cooling device is connected with a high-pressure blower; and a high-pressure evaporator and a cooling heat exchange device are arranged below the fluidized bed cooling device, and the fluidized bed cooling device comprises an air distribution pipe.
Further, the gas distribution pipe comprises a main gas inlet pipe, a distribution gas pipe, branch gas pipes and gas nozzles, the main gas inlet pipe is communicated with the outlet of the high-pressure air blower, the distribution gas pipe is communicated with the main gas inlet pipe, the branch gas pipes are provided with a plurality of gas inlets, one end of each branch gas pipe is communicated with the distribution gas pipe, the branch gas pipes are arranged in parallel, and the branch gas pipes are provided with a plurality of gas nozzles.
Further, the uniform discharging device comprises a bin bottom plate, a chute section and a bottom supporting plate; the bin bottom plates are arranged in a clearance mode, the bottom supporting plate is connected to the lower portion of the clearance between the two bin bottom plates, and a chute section is connected between the bin bottom plates and the bottom supporting plate; the bottom supporting plate is provided with a boosting nozzle in a penetrating mode, the lower end of the boosting nozzle is connected with a boosting air pipe, and the boosting air pipe is communicated with an external air supply system.
Further, a discharging hopper and a vibrating screen are arranged below the uniform discharging device, and the vibrating screen is arranged below the discharging hopper; and a coarse material hopper and a fine material pneumatic conveying and sending device are respectively arranged below the vibrating screen.
Furthermore, the constant-temperature flue gas filtering device comprises a shell, a phase change heat storage rod arranged in the middle of the shell and an ash hopper arranged at the lower part of the shell; the shell is provided with an air inlet and an air outlet, the air inlet is formed in the shell, the air outlet is formed in the upper portion of the shell, filtered flue gas is discharged along the air outlet, and then enters the fin waste heat recovery device.
Furthermore, be provided with the deashing pipe in the casing, the deashing pipe is located phase transition heat accumulation stick top, the one end and the outside air supply system intercommunication of deashing pipe, the intercommunication has a plurality of deashing shower nozzles on the deashing pipe.
Further, the fin waste heat recovery device is connected with a heat exchanger, an exhaust fan and a discharge chimney, and the heat exchanger, the exhaust fan and the discharge chimney are sequentially connected.
Furthermore, the full waste heat recovery water vapor system is connected with a high-pressure steam drum, a heat accumulator, a low-pressure steam drum, a water diversion header, a pressure pump, a deaerator and a soft water tank through pipelines, a gas mixture enters the high-pressure steam drum, and steam enters the heat accumulator after the steam-water separation of the high-pressure steam drum.
In conclusion, the invention has the following beneficial effects:
1. the system effectively improves the waste heat recovery efficiency, the molten slag is easy to use due to high temperature and high energy level, firstly, the molten slag is poured into a storage bin by a double-station pouring device, a centrifugal granulation turntable device and an air quenching device are combined organically, the molten slag granulation process of the centrifugal turntable and the air quenching granulation process are combined organically, the molten slag is crushed by mechanical force and wind force simultaneously, the defects of high energy consumption, large wind volume and the like of a pure air quenching granulation process can be avoided, and meanwhile, the vitrification rate of the slag after quenching and granulation can be effectively improved, and the method has the advantages of high granulation efficiency and low power consumption;
2. the constant-temperature flue gas filtering device in the system is arranged, high-temperature flue gas passes through the device, the device effectively filters and purifies the flue gas, the phase-change heat storage rod absorbs heat of the high-temperature flue gas by generating phase change, when the temperature in the device is lower than a set high-temperature section, the phase-change heat storage rod generates phase change to emit heat and ensures that the temperature in the device is constant in the high-temperature section, so that the phenomenon that the phase-change heat storage rod is broken under the action of alternating thermal stress is avoided, the service life of the phase-change heat storage rod is effectively prolonged, the workload of daily maintenance and repair is reduced to the greatest extent, and the reliable and stable operation of the whole system is realized;
3. the system can save energy by 36-50kg compared with standard coal for each ton of high-temperature molten slag, does not spray water in the process of granulating the molten slag, basically does not discharge sulfides, and is an environment-friendly treatment process.
Drawings
FIG. 1 is a schematic diagram of the overall structure for embodying the system in the embodiment;
FIG. 2 is an enlarged schematic structural view of a portion A of FIG. 1;
FIG. 3 is a schematic structural diagram of a uniform discharge device in the embodiment;
FIG. 4 is a schematic structural view of an embodiment for embodying the gas distribution pipe;
FIG. 5 is a schematic structural diagram of a system for recovering water vapor by using full waste heat in the embodiment;
in the figure, 1, a feeding device; 101. an inlet tank; 102. a chute; 2. a dry type quenching granulation treatment device; 201. a storage bin; 202. a centrifugal granulation carousel device; 203. a wind quenching device; 3. a full waste heat recovery water vapor system; 301. a high pressure steam drum; 302. a heat accumulator; 303. a low pressure steam drum; 304. a water diversion header; 305. a pressure pump; 306. a deaerator; 307. a soft water tank; 4. a constant temperature flue gas filtering device; 401. a shell 402 and a phase change heat storage rod; 403. an ash hopper; 5. a fin waste heat recovery device; 6. a double-station dumping device; 7. a vaporizing cooling flue; 8. a fluidized bed cooling unit; 9. a uniform discharge device; 901. a bin floor; 902. a pipe sliding section; 903. a bottom pallet; 10. a connecting pipe; 11. a high pressure blower; 12. a high pressure evaporator; 13. cooling the heat exchange device; 14. an air distribution pipe; 1401. a main air inlet pipe; 1402. distributing the air pipes; 1403. a branch air pipe; 1404. an air nozzle; 15. a boost nozzle; 16. boosting the air pipe; 17. a discharge hopper; 18. a vibratory screen; 19. a coarse material hopper; 20. a fine material pneumatic conveying and sending device; 21. an air inlet; 22. an air outlet; 23. a dust removal pipe; 24. a soot cleaning nozzle; 25. a heat exchanger; 26. an exhaust fan; 27. discharging a chimney; 28. a gas delivery pipe;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Example (b):
a high-temperature liquid dilute slag quenching dry type granulation and waste heat recovery system is shown in figure 1 and comprises a feeding device 1, a dry type quenching granulation treatment device 2, a full waste heat recovery water vapor system 3, a constant-temperature flue gas filtering device 4 and a fin waste heat recovery device 5.
As shown in FIG. 1, the charging device 1 comprises an inlet chute 101 and a chute 102, the chute 102 being connected below the inlet chute 101. The feeding device 1 further comprises a double-station dumping device 6, the double-station dumping device 6 is used for conveying molten slag into the inlet groove 101, and due to the double-station arrangement, when the molten slag ladle at one station is used for dumping high-temperature molten slag, the molten slag ladle at the other station can be replaced at the same time, and after the molten slag ladle is replaced, the molten slag ladle can be moved into the inlet groove for dumping operation. Therefore, on one hand, the continuous production of steam is facilitated, and on the other hand, the impact of thermal shock on the temperature fluctuation process can be reduced to the maximum extent.
As shown in fig. 1, the dry type rapid cooling and granulating treatment apparatus 2 includes a storage bin 201, a centrifugal granulating rotary table apparatus 202 and an air quenching apparatus 203, the centrifugal granulating apparatus is disposed in the middle of the storage bin 201, and the air quenching apparatus 203 is used for conveying nitrogen gas into the centrifugal granulating apparatus. The inlet chute 101 is provided at one side of the storage bin 201 for feeding the molten slag into the storage bin, and the feed chute is provided at a side wall of the storage bin 201, through which the molten slag enters the storage bin 201.
As shown in fig. 1, the slag contains a large amount of high-temperature flue gas, and when the slag enters the storage bin 201, the flue gas in the storage bin 201 needs to move upward and then move upward along the storage bin 201. The upper part of the storage bin 201 is communicated with a vaporization cooling flue 7, and the flue gas in the slag enters the constant-temperature flue gas filtering device 4 through the vaporization cooling flue 7. The upper part of the constant-temperature flue gas filtering device 4 is connected with a gas conveying pipe, and the constant-temperature flue gas filtering device 4 filters high-temperature flue gas.
As shown in fig. 1 and 5, the filtered flue gas enters the fin waste heat recovery device 5 through the gas pipe, and the waste heat is absorbed and utilized. The dry quenching and granulating treatment device 2 is communicated with the full waste heat recovery water vapor system 3 through a plurality of connecting pipes 10, and the full waste heat recovery water vapor system 3 recovers waste heat in the molten slag, so that the utilization rate of the molten slag is improved.
As shown in fig. 1 and 4, the storage bin 201 is provided at a lower portion thereof with a fluidized-bed cooling device 8 and a uniform discharge device 9. One side of fluidized bed cooling device 8 is connected with high-pressure air-blower 11, and fluidized bed cooling device 8's below is provided with high-pressure evaporator 12 and cooling heat transfer device 13, and fluidized bed cooling device 8 includes gas distribution pipe 14, through gas distribution pipe 14's setting, improves the cooling rate of slag.
As shown in fig. 1 and 4, the gas distribution pipe 14 includes a main gas inlet pipe 1401, a distribution gas pipe 1402, a plurality of branch gas pipes 1403 and gas nozzles 1404, the main gas inlet pipe 1401 is communicated with an outlet of the high-pressure blower 11, the distribution gas pipe 1402 is communicated with the main gas inlet pipe 1401, the branch gas pipes 1403 are provided in plurality, one end of each branch gas pipe 1403 is communicated with the distribution gas pipe 1402, the plurality of branch gas pipes 1403 are arranged in parallel, and the branch gas pipes 1403 are provided with the plurality of gas nozzles 1404.
As shown in fig. 1 and 3, in order to achieve uniform discharge of the slag from the storage bin 201, a drift phenomenon is avoided. A uniform discharge apparatus 9 is provided comprising a bin floor 901, chute section 902 and bottom pallet 903. The bin bottom plates 901 are arranged in a clearance mode, the bottom support plates 903 are connected to the lower portions of the gaps of the two bin bottom plates 901, the chute 102 sections are connected between the bin bottom plates 901 and the bottom support plates 903, the bottom support plates 903 are provided with boosting nozzles 15 in a penetrating mode, the lower ends of the boosting nozzles 15 are connected with boosting air pipes 16, and the boosting air pipes 16 are communicated with an external air supply system.
As shown in fig. 1 and 3, the bottom support plate 903 on the uniform discharging device 9 can be adjusted according to the angle of the slag, so that the slag can be reliably stopped on the bottom support plate 903 and cannot automatically flow down in the absence of external force. During production operation, the slag is discharged from the storage bin 201 smoothly and evenly under the action of the gas source force.
As shown in fig. 1, since the slag has a non-uniform particle size, the slag is used differently depending on the particle size of the slag. A discharging hopper 17 and a vibrating screen 18 are arranged below the uniform discharging device 9. The vibrating screen 18 is arranged below the discharging hopper 17, and a coarse material hopper 19 and a fine material pneumatic conveying and sending device 20 are respectively arranged below the vibrating screen 18. Large-particle slag in the slag enters a coarse material hopper 19, and fine materials screened by the vibratory screen 18 are conveyed to corresponding positions through a fine material pneumatic conveying and sending device 20.
As shown in fig. 1 and 2, the high-temperature flue gas in the storage bin 201 continuously rises to enter the constant-temperature flue gas filtering device 4, and the constant-temperature flue gas filtering device 4 comprises a shell 401, a phase-change heat storage rod 402 arranged in the middle of the shell 401, and an ash hopper 403 arranged at the lower part of the shell 401. The shell 401 is provided with an air inlet 21 and an air outlet 22, the air inlet 21 is arranged on the shell 401, the air outlet 22 is arranged on the upper portion of the shell 401, filtered flue gas is discharged along the air outlet 22 and then enters the fin waste heat recovery device 5, and heat in the flue gas is recycled.
As shown in fig. 1 and 2, after the constant temperature filter apparatus is used for a certain period of time, it may occur that a part of dust is accumulated between the phase-change heat storage rods 402, reducing the constant temperature effect of the phase-change heat storage rods 402. Therefore, an ash removal pipe 23 is arranged in the shell 401, the ash removal pipe 23 is positioned above the phase-change heat storage rod 402, one end of the ash removal pipe 23 is communicated with an external air supply system, and a plurality of ash removal nozzles 24 are communicated on the ash removal pipe 23.
As shown in fig. 1, the fin waste heat recovery device 5 is connected with a heat exchanger 25, an exhaust fan 26 and an exhaust chimney 27, and the heat exchanger 25, the exhaust fan 26 and the exhaust chimney 27 are connected in sequence to absorb and utilize heat in flue gas.
As shown in fig. 1 and 5, the full waste heat recovery water vapor system 3 is connected with a high-pressure steam drum 301, a heat accumulator 302, a low-pressure steam drum 303, a water diversion header tank 304, a pressure pump 305, a deaerator 306 and a soft water tank 307 through pipelines, a gas mixture enters the high-pressure steam drum 301, after steam and water of the high-pressure steam drum 301 are separated, steam enters the heat accumulator 302, hot flue gas generated in the vaporization cooling flue 7, the storage bin 201 and the high-pressure evaporator 12 simultaneously enters the high-pressure steam drum 301, and waste heat recovery and utilization are performed through the heat accumulator 302.
The specific implementation process comprises the following steps: when the system starts to work, firstly, the double-station dumping device 6 dumps the molten slag into the feeding chute, the molten slag enters the storage bin 201 along the feeding chute, the flue gas in the storage bin 201 enters the constant-temperature flue gas filtering device 4 through the vaporization cooling flue 7, the molten slag in the storage bin 201 is granulated and cooled through the dry type rapid cooling granulation processing device 2, and then the molten slag is discharged through the uniform discharging device 9 and respectively enters the coarse material hopper 19 and the fine material pneumatic conveying and sending device 20. Hot flue gas generated in the vaporization cooling flue 7, the storage bin 201 and the high-pressure evaporator 12 simultaneously enters the high-pressure steam drum 301, waste heat recovery is carried out through the heat accumulator 302 and the like, and meanwhile, the filtered flue gas enters the fin waste heat recovery device 5 through the gas conveying pipe, so that waste heat in the slag is further recovered.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. A high-temperature liquid dilute slag quenching dry type granulation and waste heat recovery system is characterized by comprising a feeding device (1), a dry type quenching granulation treatment device (2), a full waste heat recovery water vapor system (3), a constant-temperature flue gas filtering device (4) and a fin waste heat recovery device (5); the feeding device (1) comprises an inlet groove (101) and a chute (102), wherein the chute (102) is connected below the inlet groove (101); the dry type rapid cooling and granulating treatment device (2) comprises a storage bin (201), a centrifugal granulating rotary disc device (202) and an air quenching device (203), wherein the centrifugal granulating rotary disc device (202) is arranged in the middle of the storage bin (201), and the air quenching device (203) is used for conveying nitrogen or air into the centrifugal granulating rotary disc device (202);
the inlet groove (101) is arranged on the side wall of the storage bin (201), and the molten slag enters the storage bin (201) through the inlet groove (101); the upper part of the storage bin (201) is communicated with a vaporization cooling flue (7), and flue gas in the slag enters a constant-temperature flue gas filtering device (4) through the vaporization cooling flue (7); the upper part of the constant-temperature flue gas filtering device (4) is connected with a gas conveying pipe, and the filtered flue gas enters the fin waste heat recovery device (5) through the gas conveying pipe; the dry quenching and granulating treatment device (2) is communicated with the full waste heat recovery water vapor system (3) through a plurality of connecting pipes (10), and the full waste heat recovery water vapor system (3) recovers waste heat in the molten slag.
2. The high temperature liquid dilute slag quenching dry granulation and waste heat recovery system as claimed in claim 1, wherein: the feeding device (1) comprises a double-station pouring device (6), and the double-station pouring device (6) is used for conveying molten slag into the inlet groove (101).
3. The high temperature liquid dilute slag quenching dry granulation and waste heat recovery system as claimed in claim 1, wherein: the lower part of the storage bin (201) is provided with a fluidized bed cooling device (8) and a uniform discharging device (9); one side of the fluidized bed cooling device (8) is connected with a high-pressure blower (11); a high-pressure evaporator (12) and a cooling heat exchange device (13) are arranged below the fluidized bed cooling device (8), and the fluidized bed cooling device (8) comprises an air distribution pipe (14).
4. The high temperature liquid dilute slag quenching dry granulation and waste heat recovery system as claimed in claim 3, wherein: the air distribution pipe (14) comprises a total air inlet pipe (1401), a distribution air pipe (1402), branch air pipes (1403) and air nozzles (1404), the total air inlet pipe (1401) is communicated with an outlet of a high-pressure blower (11), the distribution air pipe (1402) is communicated with the total air inlet pipe (1401), the branch air pipes (1403) are provided with a plurality of air nozzles, one end of each branch air pipe (1403) is communicated with the distribution air pipe (1402), the branch air pipes (1403) are arranged in parallel, and the branch air pipes (1403) are provided with the air nozzles (1404).
5. The high temperature liquid dilute slag quenching dry granulation and waste heat recovery system as claimed in claim 1, wherein: the uniform discharging device (9) comprises a bin bottom plate (901), a chute section (902) and a bottom supporting plate (903); the bin bottom plates (901) are arranged in a clearance mode, the bottom supporting plate (903) is connected to the lower portion of the clearance between the two bin bottom plates (901), and a chute section (902) is connected between the bin bottom plates (901) and the bottom supporting plate (903); the bottom supporting plate (903) is provided with a boosting nozzle (15) in a penetrating mode, the lower end of the boosting nozzle (15) is connected with a boosting air pipe (16), and the boosting air pipe (16) is communicated with an external air supply system.
6. The high temperature liquid dilute slag quenching dry granulation and waste heat recovery system as claimed in claim 5, wherein: a discharging hopper (17) and a vibrating screen (18) are arranged below the uniform discharging device (9), and the vibrating screen (18) is arranged below the discharging hopper (17); and a coarse material hopper (19) and a fine material pneumatic conveying and sending device (20) are respectively arranged below the vibrating screen (18).
7. The high temperature liquid dilute slag quenching dry granulation and waste heat recovery system as claimed in claim 1, wherein: the constant-temperature flue gas filtering device (4) comprises a shell (401), a phase change heat storage rod (402) arranged in the middle of the shell (401) and an ash hopper (403) arranged at the lower part of the shell (401); the fin waste heat recovery device is characterized in that an air inlet (21) and an air outlet (22) are formed in the shell (401), the air inlet (21) is formed in the shell (401), the air outlet (22) is formed in the upper portion of the shell (401), filtered flue gas is discharged along the air outlet (22), and then enters the fin waste heat recovery device (5).
8. The high temperature liquid dilute slag quenching dry granulation and waste heat recovery system as claimed in claim 6, wherein: be provided with deashing pipe (23) in casing (401), deashing pipe (23) are located phase change heat storage stick (402) top, the one end and the outside air supply system intercommunication of deashing pipe (23), the intercommunication has a plurality of deashing shower nozzles (24) on deashing pipe (23).
9. The high temperature liquid dilute slag quenching dry granulation and waste heat recovery system as claimed in claim 6, wherein: the fin waste heat recovery device (5) is connected with a heat exchanger (25), an exhaust fan (26) and a discharge chimney (27), and the heat exchanger (25), the exhaust fan (26) and the discharge chimney (27) are sequentially connected.
10. The high temperature liquid dilute slag quenching dry granulation and waste heat recovery system as claimed in claim 1, wherein: the full waste heat recovery water vapor system (3) is connected with a high-pressure steam drum (301), a heat accumulator (302), a low-pressure steam drum (303), a water diversion header tank (304), a pressure pump (305), a deaerator (306) and a soft water tank (307) through pipelines, a gas mixture enters the high-pressure steam drum (301), and steam enters the heat accumulator (302) after the steam-water separation of the high-pressure steam drum (301).
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