CN117146602A - Electric furnace slag waste heat utilization system for nickel laterite ore RKEF process - Google Patents
Electric furnace slag waste heat utilization system for nickel laterite ore RKEF process Download PDFInfo
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- CN117146602A CN117146602A CN202311088854.5A CN202311088854A CN117146602A CN 117146602 A CN117146602 A CN 117146602A CN 202311088854 A CN202311088854 A CN 202311088854A CN 117146602 A CN117146602 A CN 117146602A
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- Prior art keywords
- kiln
- slag
- waste heat
- car
- heat boiler
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- 239000002893 slag Substances 0.000 title claims abstract description 185
- 239000002918 waste heat Substances 0.000 title claims abstract description 76
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 22
- 239000011504 laterite Substances 0.000 title claims abstract description 11
- 229910001710 laterite Inorganic materials 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000428 dust Substances 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 11
- 238000007599 discharging Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 229910000863 Ferronickel Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/26—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/38—Arrangements of devices for charging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
-
- 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
- F27D19/00—Arrangements of controlling devices
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1545—Equipment for removing or retaining slag
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The system for utilizing the waste heat of the electric furnace slag of the RKEF process of the laterite nickel ore comprises a tunnel kiln, a blower, an induced draft fan, a waste heat boiler, a steam turbine and a generator; the tunnel kiln is internally provided with a kiln car for dragging the slag car; the air inlet of the air blower is communicated with the atmosphere, and the air outlet of the air blower is communicated with the kiln tail side of the tunnel kiln; the waste heat boiler adopts a heat exchange type waste heat boiler, and the waste heat boiler comprises an air inlet, an air outlet, a water inlet and a steam outlet; the air inlet of the induced draft fan is communicated with the kiln head side of the tunnel kiln, the air outlet of the induced draft fan is communicated with the air inlet of the waste heat boiler, the air outlet of the waste heat boiler is communicated with the atmosphere, the water inlet of the waste heat boiler is used for introducing clear water, and the steam outlet of the waste heat boiler is used for outputting high-temperature steam; the steam inlet of the steam turbine is communicated with the steam outlet of the waste heat boiler, and the power output shaft of the steam turbine is fixedly connected with the power input shaft of the generator; a dust remover is arranged between the air outlet of the induced draft fan and the air inlet of the waste heat boiler.
Description
Technical Field
The invention belongs to the technical field of laterite-nickel ore smelting, and particularly relates to an electric furnace slag waste heat utilization system for an RKEF process of laterite-nickel ore.
Background
Currently, the rotary kiln prereduction-electric furnace smelting process (RKEF) is the main stream process for producing ferronickel by using laterite-nickel ore, and the productivity ratio of the process is more than 2/3 of the total global ferronickel productivity. The temperature of the RKEF process electric furnace slag is between 1500 and 1600 ℃, and the sensible heat accounts for about 50 percent of the heat expenditure of the electric furnace.
However, the RKEF process is mainly used for treating the electric slag, a wet water quenching process is adopted, the waste heat recovery rate of the slag in the water quenching process is extremely low, only a small part of waste heat energy of the slag is mainly used for producing low-pressure steam and hot water, the low-pressure steam is used for production links, the hot water is basically used for heating in winter, and most of the waste heat energy contained in the slag is only wasted.
Furthermore, under the water quenching process, at least 1 ton of clean water is consumed for cooling 1 ton of slag, so that the consumption of water resources is extremely large. In addition, a large amount of SO is generated in the water quenching process 2 And H 2 S is discharged into the atmosphere, thereby polluting the atmosphere.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a waste heat utilization system for the electric furnace slag of the RKEF process of the laterite nickel ore, which is characterized in that a tunnel kiln is utilized to perform air cooling heat exchange on high-temperature slag, high-temperature drying air formed after heat exchange is subjected to waste heat collection, and the collected waste heat energy is directly used for power generation.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the system for utilizing the waste heat of the electric furnace slag of the RKEF process of the laterite nickel ore comprises a tunnel kiln, a blower, an induced draft fan, a waste heat boiler, a steam turbine and a generator; the tunnel kiln is internally provided with a kiln car for dragging the slag car; the air inlet of the air blower is communicated with the atmosphere, and the air outlet of the air blower is communicated with the kiln tail side of the tunnel kiln; the waste heat boiler adopts a heat exchange type waste heat boiler, and the waste heat boiler comprises an air inlet, an air outlet, a water inlet and a steam outlet; an air inlet of the induced draft fan is communicated with the kiln head side of the tunnel kiln, an air outlet of the induced draft fan is communicated with an air inlet of the waste heat boiler, an air outlet of the waste heat boiler is communicated with the atmosphere, a water inlet of the waste heat boiler is used for introducing clean water, and a steam outlet of the waste heat boiler is used for outputting high-temperature steam; the steam inlet of the steam turbine is communicated with the steam outlet of the waste heat boiler, and the power output shaft of the steam turbine is fixedly connected with the power input shaft of the generator.
A dust remover is arranged between the air outlet of the induced draft fan and the air inlet of the waste heat boiler, and dust in the high-temperature air is removed through the dust remover, so that the high-temperature air entering the air inlet of the waste heat boiler is purified high-temperature air.
The tunnel kiln adopts an integral closed reinforced concrete structure, two side areas of the tunnel kiln are respectively set as a slag transport vehicle entering area and a slag transport vehicle exiting area, and the middle area of the tunnel kiln is set as a heat exchange area; a first kiln inlet gate is arranged between the slag transport vehicle driving-in area and the exterior of the kiln body, a second kiln inlet gate is arranged between the slag transport vehicle driving-in area and the heat exchange area, a first kiln outlet gate is arranged between the heat exchange area and the slag transport vehicle driving-out area, and a second kiln outlet gate is arranged between the slag transport vehicle driving-out area and the exterior of the kiln body.
And distance sensors are arranged on the inner side and the outer side of the first kiln inlet gate, the second kiln inlet gate, the first kiln outlet gate and the second kiln outlet gate of the tunnel kiln, the distance between the slag conveying vehicle and each gate is detected through the distance sensors, and the distance data are used as the door opening basis of each gate.
An infrared sensor is arranged outside the first kiln inlet gate of the tunnel kiln, the real-time temperature of high-temperature slag loaded on the slag transport vehicle is detected through the infrared sensor, and the temperature data is used as the door opening basis of the first kiln inlet gate.
The heat-insulating material layers are respectively stuck on the inner surface and the outer surface of the tunnel kiln, the height and the width of the kiln body of the tunnel kiln and the height and the width of a slag conveying vehicle filled with high-temperature slag are in an adaptive design, the top of the tunnel kiln adopts an arch structure, and slag conveying vehicle rails extending to the outside of the kiln are paved inside the tunnel kiln.
The tunnel kiln adopts single kiln body layout or multi-kiln body parallel layout, and slag conveying vehicle tracks in the tunnel kiln adopt single track layout or multi-track parallel layout.
The number of slag conveying vehicles filled with high-temperature slag and passing through the tunnel kiln is at least one.
And a plurality of temperature sensors are arranged in the tunnel kiln, and the temperature in the kiln is detected in real time through the temperature sensors.
The slag car entering area of the tunnel kiln is communicated with an external electric furnace through a slag car track, and a kiln car pusher is arranged on the slag car track; the outside of the tunnel kiln is also provided with an overhead travelling crane, and a slag storage bin is arranged below the travelling rail of the overhead travelling crane; the slag car outgoing area of the tunnel kiln is also communicated with the electric furnace through slag car rails, and the slag car is provided with a kiln car pusher on the slag car rails.
The invention has the beneficial effects that:
according to the electric furnace slag waste heat utilization system for the laterite nickel ore RKEF process, disclosed by the invention, the tunnel kiln is utilized for carrying out air cooling heat exchange on the high-temperature furnace slag, the high-temperature drying air formed after the heat exchange is subjected to waste heat collection, and the collected waste heat energy is directly used for power generation.
Drawings
FIG. 1 is a schematic diagram of an electric furnace slag waste heat utilization system for a laterite nickel ore RKEF process of the invention;
in the figure, a tunnel kiln, a 2-blower, a 3-induced draft fan, a 4-dust remover, a 5-waste heat boiler, a 6-steam turbine, a 7-generator, an 8-kiln entering car pusher, a 9-kiln exiting car pusher, a 10-crown block, an 11-slag storage bin, a 12-slag carrier, a 13-electric furnace and 14-slag are arranged.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1, the electric furnace slag waste heat utilization system for the laterite nickel ore RKEF process comprises a tunnel kiln 1, a blower 2, an induced draft fan 3, a waste heat boiler 5, a steam turbine 6 and a generator 7; the tunnel kiln 1 is internally provided with a slag car 12 for passing high-temperature slag 14, and the tunnel kiln 1 is internally provided with a kiln car for dragging the slag car 12; the air inlet of the air blower 2 is communicated with the atmosphere, and the air outlet of the air blower 2 is communicated with the kiln tail side of the tunnel kiln 1; the waste heat boiler 4 adopts a heat exchange type waste heat boiler, and the waste heat boiler 4 comprises an air inlet, an air outlet, a water inlet and a steam outlet; an air inlet of the induced draft fan 3 is communicated with the kiln head side of the tunnel kiln 1, an air outlet of the induced draft fan 3 is communicated with an air inlet of the waste heat boiler 4, an air outlet of the waste heat boiler 4 is communicated with the atmosphere, a water inlet of the waste heat boiler 4 is used for introducing clean water, and a steam outlet of the waste heat boiler 4 is used for outputting high-temperature steam; the steam inlet of the steam turbine 6 is communicated with the steam outlet of the waste heat boiler 4, and the power output shaft of the steam turbine 6 is fixedly connected with the power input shaft of the generator 7.
A dust remover 4 is further arranged between the air outlet of the induced draft fan 3 and the air inlet of the waste heat boiler 5, and dust in the high-temperature air is removed through the dust remover 4, so that the high-temperature air entering the air inlet of the waste heat boiler 5 is purified high-temperature air.
The tunnel kiln 1 adopts an integral closed reinforced concrete structure, two side areas of the tunnel kiln 1 are respectively set as a slag carrier entering area and a slag carrier exiting area, and the middle area of the tunnel kiln 1 is set as a heat exchange area; a first kiln inlet gate is arranged between the slag transport vehicle driving-in area and the exterior of the kiln body, a second kiln inlet gate is arranged between the slag transport vehicle driving-in area and the heat exchange area, a first kiln outlet gate is arranged between the heat exchange area and the slag transport vehicle driving-out area, and a second kiln outlet gate is arranged between the slag transport vehicle driving-out area and the exterior of the kiln body.
The inner side and the outer side of the first kiln inlet gate, the second kiln inlet gate, the first kiln outlet gate and the second kiln outlet gate of the tunnel kiln 1 are respectively provided with a distance sensor, the distance between the slag carrier 12 and each gate is detected by the distance sensors, and the distance data is used as the door opening basis of each gate.
An infrared sensor is arranged outside the first kiln entrance gate of the tunnel kiln 1, and the real-time temperature of the high-temperature slag 14 loaded on the slag carrier 12 is detected by the infrared sensor, and the temperature data is used as the basis for opening the first kiln entrance gate.
The heat insulation material layers are respectively adhered to the inner surface and the outer surface of the tunnel kiln 1, the height and the width of the kiln body of the tunnel kiln 1 and the height and the width of a slag conveying vehicle 12 filled with high-temperature slag 14 are in an adaptive design, the top of the tunnel kiln adopts an arch structure, and a slag conveying vehicle track extending to the outside of the kiln is paved inside the tunnel kiln 1.
The tunnel kiln 1 adopts single kiln body layout or multi-kiln body parallel layout, and slag conveying vehicle tracks in the tunnel kiln 1 adopt single track layout or multi-track parallel layout.
The number of slag carriers 12 filled with high-temperature slag 14 passing through the tunnel kiln 1 is at least one.
A plurality of temperature sensors are arranged in the tunnel kiln 1, and the temperature in the kiln is detected in real time through the temperature sensors.
The slag car entering area of the tunnel kiln 1 is communicated with an external electric furnace 13 through slag car rails, and the slag car 12 is provided with a kiln car pusher 8 on the slag car rails; the outside of the tunnel kiln 1 is also provided with a crown block 10, and a slag storage bin 11 is arranged below the running track of the crown block 10; the slag car outgoing area of the tunnel kiln 1 is also communicated with the electric furnace 13 through slag car tracks, and the slag car 12 is provided with a kiln car pusher 9 on the slag car tracks.
The following describes a one-time use procedure of the present invention with reference to the accompanying drawings:
in the embodiment, the communication mode of the electric furnace slag waste heat utilization system of the nickel laterite RKEF process can be a wireless mode or a wired mode, and all electric control equipment in the system is uniformly controlled by a computer; a lifting area for lifting the slag carrier 12 is arranged at the outer side of the second kiln outlet gate, and a slag 14 charging area of the slag carrier 12 is arranged at a slag discharging port of the electric furnace 13; the kiln entering pusher 8 and the kiln exiting pusher 9 are pin tooth type pusher.
After a computer sends a start command, the kiln car entering machine 8 in a charging area is locked with an empty slag car 12, the kiln car entering machine 8 pushes the slag car 12 to move to the position right below a slag discharging port of an electric furnace 13, then a baffle plate of the slag discharging port of the electric furnace 13 is opened, high-temperature slag 14 with the temperature of 1500-1600 ℃ is discharged into the slag car 12, an infrared sensor for detecting charging amount is arranged at the slag discharging port of the electric furnace 13, after the infrared sensor detects that the high-temperature slag 14 in the slag car 12 is full, the baffle plate of the slag discharging port of the electric furnace 13 is closed, and finally the kiln car entering machine 8 is started, so that the slag car 12 filled with the high-temperature slag 14 moves to a tunnel kiln 1 along a slag car track.
When the slag car 12 filled with the high-temperature slag 14 moves to the front of the door of the first kiln inlet gate, a distance sensor and an infrared sensor are arranged outside the door of the first kiln inlet gate in advance, the slag car 12 filled with the high-temperature slag 14 can be detected, when the distance sensor detects that the distance between the slag car 12 and the first kiln inlet gate is less than or equal to 20 meters, and when the temperature of the high-temperature slag 14 in the slag car 12 is detected to be more than or equal to 1000 ℃, the first kiln inlet gate is opened.
When the first kiln inlet gate is opened, the kiln car waits in the entering area of the slag car of the tunnel kiln 1, the kiln inlet pusher 8 pushes the slag car 12 filled with the high-temperature slag 14 to the kiln car until the slag car 12 is locked with the kiln car, and at the moment, the kiln inlet pusher 8 is separated from the slag car 12 and returns to the discharging area by itself to wait for the next loading and transferring of the high-temperature slag 14.
When the slag car 12 filled with the high-temperature slag 14 is locked with the kiln car, the kiln car pulls the slag car 12 into a slag car entering area of the tunnel kiln 1, and when the distance sensor at the outer side of the second kiln inlet gate detects that the slag car 12 completely enters the slag car entering area, the first kiln inlet gate is closed, meanwhile, the second kiln inlet gate is opened, the slag car 12 directly enters a heat exchange area of the tunnel kiln 1 through the opened second kiln inlet gate, and then the second kiln inlet gate is closed.
When the slag carrier 12 filled with the high-temperature slag 14 enters the heat exchange area of the tunnel kiln 1, the air blower 2 and the induced draft fan 3 outside the kiln are synchronously started, normal-temperature air outside the kiln is blown into the heat exchange area of the tunnel kiln 1 by the air blower 2, in the process that the slag carrier 12 moves from the head side to the tail side of the tunnel kiln 1, the high-temperature slag 14 loaded in the slag carrier 12 can perform real-time heat exchange with the blown normal-temperature air, the slag 14 realizes air cooling, the normal-temperature air is heated into high-temperature air, the formed high-temperature air is led out from the head side of the tunnel kiln 1 by the induced draft fan 3, the operation pressure of the induced draft fan 3 is controlled to be 2-5 kPa, and the temperature in the kiln is synchronously monitored by the temperature sensor in real time in the heat exchange operation process.
When high-temperature air is led out by the induced draft fan 3, the high-temperature air directly enters the dust remover 4 to finish dust removal, the purified high-temperature air enters the air inlet of the waste heat boiler 4, the temperature of the high-temperature air is 300-450 ℃, clean water is simultaneously introduced into the water inlet of the waste heat boiler 4, the high-temperature air can exchange heat with the clean water in the waste heat boiler 4 by means of a heat exchange pipeline, after heat exchange, steam with the temperature of 200-250 ℃ can be output by the steam outlet of the waste heat boiler 4, the steam is directly introduced into the steam inlet of the steam turbine 6, the rotor for driving rotates, the rotor for driving the generator 7 rotates, the power generation is finally realized, and the power generation power of the generator 7 is 100-200 kW. Meanwhile, the air after heat exchange is changed into low-temperature air and is discharged into the atmosphere.
When the temperature sensor detects that the average temperature in the kiln is lower than 100 ℃, the air blower 2 and the induced draft fan 3 are switched into a low-altitude running state, the waste heat boiler 4, the steam turbine 6 and the generator 7 are stopped, meanwhile, the first kiln outlet gate is opened, the slag carriage 12 filled with cooling slag 14 enters the slag carriage outlet area from the heat exchange area of the tunnel kiln 1, and when the distance sensor at the inner side of the second kiln outlet gate detects that the slag carriage 12 completely enters the slag carriage outlet area, the first kiln outlet gate is closed, the second kiln outlet gate is opened, and the air blower 2 and the induced draft fan 3 are stopped.
When the slag car 12 with the cooling slag 14 enters the slag car exit area, the kiln car 9 waits at the exit of the second kiln outlet gate of the slag car exit area of the tunnel kiln 1, the kiln car pushes the slag car 12 with the cooling slag 14 towards the kiln car 9 until the slag car 12 is locked with the kiln car 9, and then the kiln car is separated from the slag car 12 and returns to the tunnel kiln 1 by itself until the slag car returns to the slag car entrance area of the tunnel kiln 1 to wait for the next cooling of the slag 14, and each gate is automatically opened and closed in the kiln car returning process.
After the slag car 12 filled with the cooling slag 14 is locked with the kiln car puller 9, the slag car 12 is pushed to a lifting area by the kiln car puller 9, then the kiln car puller 9 is separated from the slag car 12, the slag car 12 filled with the cooling slag 14 is lifted by the crown block 10 and transferred to the upper part of the slag storage bin 11, then a discharge opening of the slag car 12 is opened, and the cooling slag 14 is discharged into the Chu Zha bin 11 below.
When the slag car 12 discharges the slag 14 in the car, the discharge opening of the slag car 12 is closed, and the empty slag car 12 is lifted back to the lifting area by the overhead travelling crane 10, after which the lifting appliance of the overhead travelling crane 10 is disconnected from the slag car 12, and the overhead travelling crane 10 withdraws the lifting appliance and waits for the next lifting operation.
When the empty slag car 12 returns to the lifting area again, the kiln car puller 9 and the slag car 12 are locked again, and then the empty slag car 12 is pushed by the kiln car puller 9 to move towards the electric furnace 13 until the slag car 12 moves to the charging area, and then the kiln car puller 9 is separated from the slag car 12 until the kiln car puller returns to the outlet of the second kiln gate to wait for the next operation.
The embodiments are not intended to limit the scope of the invention, but rather are intended to cover all equivalent implementations or modifications that can be made without departing from the scope of the invention.
Claims (10)
1. The utility model provides a laterite nickel ore RKEF technology electric stove slag waste heat utilization system which characterized in that: comprises a tunnel kiln, a blower, an induced draft fan, a waste heat boiler, a steam turbine and a generator; the tunnel kiln is internally provided with a kiln car for dragging the slag car; the air inlet of the air blower is communicated with the atmosphere, and the air outlet of the air blower is communicated with the kiln tail side of the tunnel kiln; the waste heat boiler adopts a heat exchange type waste heat boiler, and the waste heat boiler comprises an air inlet, an air outlet, a water inlet and a steam outlet; an air inlet of the induced draft fan is communicated with the kiln head side of the tunnel kiln, an air outlet of the induced draft fan is communicated with an air inlet of the waste heat boiler, an air outlet of the waste heat boiler is communicated with the atmosphere, a water inlet of the waste heat boiler is used for introducing clean water, and a steam outlet of the waste heat boiler is used for outputting high-temperature steam; the steam inlet of the steam turbine is communicated with the steam outlet of the waste heat boiler, and the power output shaft of the steam turbine is fixedly connected with the power input shaft of the generator.
2. The laterite-nickel ore RKEF process electric furnace slag waste heat utilization system of claim 1, wherein: a dust remover is arranged between the air outlet of the induced draft fan and the air inlet of the waste heat boiler, and dust in the high-temperature air is removed through the dust remover, so that the high-temperature air entering the air inlet of the waste heat boiler is purified high-temperature air.
3. The laterite-nickel ore RKEF process electric furnace slag waste heat utilization system of claim 2, wherein: the tunnel kiln adopts an integral closed reinforced concrete structure, two side areas of the tunnel kiln are respectively set as a slag transport vehicle entering area and a slag transport vehicle exiting area, and the middle area of the tunnel kiln is set as a heat exchange area; a first kiln inlet gate is arranged between the slag transport vehicle driving-in area and the exterior of the kiln body, a second kiln inlet gate is arranged between the slag transport vehicle driving-in area and the heat exchange area, a first kiln outlet gate is arranged between the heat exchange area and the slag transport vehicle driving-out area, and a second kiln outlet gate is arranged between the slag transport vehicle driving-out area and the exterior of the kiln body.
4. A laterite nickel ore RKEF process electric furnace slag waste heat utilization system as defined in claim 3, wherein: and distance sensors are arranged on the inner side and the outer side of the first kiln inlet gate, the second kiln inlet gate, the first kiln outlet gate and the second kiln outlet gate of the tunnel kiln, the distance between the slag conveying vehicle and each gate is detected through the distance sensors, and the distance data are used as the door opening basis of each gate.
5. The laterite-nickel ore RKEF process electric furnace slag waste heat utilization system as claimed in claim 4, wherein: an infrared sensor is arranged outside the first kiln inlet gate of the tunnel kiln, the real-time temperature of high-temperature slag loaded on the slag transport vehicle is detected through the infrared sensor, and the temperature data is used as the door opening basis of the first kiln inlet gate.
6. The laterite-nickel ore RKEF process electric furnace slag waste heat utilization system according to claim 5, wherein: the heat-insulating material layers are respectively stuck on the inner surface and the outer surface of the tunnel kiln, the height and the width of the kiln body of the tunnel kiln and the height and the width of a slag conveying vehicle filled with high-temperature slag are in an adaptive design, the top of the tunnel kiln adopts an arch structure, and slag conveying vehicle rails extending to the outside of the kiln are paved inside the tunnel kiln.
7. The laterite-nickel ore RKEF process electric furnace slag waste heat utilization system as defined in claim 6, wherein: the tunnel kiln adopts single kiln body layout or multi-kiln body parallel layout, and slag conveying vehicle tracks in the tunnel kiln adopt single track layout or multi-track parallel layout.
8. The laterite-nickel ore RKEF process electric furnace slag waste heat utilization system of claim 7, wherein: the number of slag conveying vehicles filled with high-temperature slag and passing through the tunnel kiln is at least one.
9. The laterite-nickel ore RKEF process electric furnace slag waste heat utilization system of claim 8, wherein: and a plurality of temperature sensors are arranged in the tunnel kiln, and the temperature in the kiln is detected in real time through the temperature sensors.
10. The laterite-nickel ore RKEF process electric furnace slag waste heat utilization system of claim 9, wherein: the slag car entering area of the tunnel kiln is communicated with an external electric furnace through a slag car track, and a kiln car pusher is arranged on the slag car track; the outside of the tunnel kiln is also provided with an overhead travelling crane, and a slag storage bin is arranged below the travelling rail of the overhead travelling crane; the slag car outgoing area of the tunnel kiln is also communicated with the electric furnace through slag car rails, and the slag car is provided with a kiln car pusher on the slag car rails.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118189657A (en) * | 2024-05-20 | 2024-06-14 | 思源交大河北科技有限公司 | Steel slag waste heat utilization system |
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