CN112146446B - Blast furnace slag granulation heat exchange device based on multi-medium coupling - Google Patents
Blast furnace slag granulation heat exchange device based on multi-medium coupling Download PDFInfo
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- CN112146446B CN112146446B CN201910577247.2A CN201910577247A CN112146446B CN 112146446 B CN112146446 B CN 112146446B CN 201910577247 A CN201910577247 A CN 201910577247A CN 112146446 B CN112146446 B CN 112146446B
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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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/14—Charging or discharging liquid or molten material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a blast furnace slag granulation heat exchange device based on multi-medium coupling, which comprises a slag granulation assembly, a slag granule conveying assembly, a waste heat recovery assembly and a tail gas treatment assembly; the slag granulating component comprises a slag runner (1), a tundish (2), a rotary granulating mechanism (4), a granulating cavity (7) and an air blowing system (9), the slag granule conveying component comprises a circular cooler (8), the air blowing system (9), a high-temperature conveyor (10), a steel ball (11), a first bucket elevator (12), a heat exchanger (13), a conveyor (14), a second bucket elevator (16) and a granule slag bin (17), an air inlet port of the waste heat recovery component is connected to an air outlet port of the slag granulating component and the slag granule conveying component, and a tail gas treatment component is connected to an air outlet port of the waste heat recovery component. The invention can realize the dry granulation of the blast furnace slag, prolong the service life of the granulator turntable, and has large processing capacity and high heat energy recovery and utilization rate.
Description
Technical Field
The invention relates to metallurgical slag treatment equipment, in particular to a blast furnace slag granulation heat exchange device based on multi-medium coupling.
Background
Blast furnace slag is a main byproduct of blast furnace ironmaking, and about 350 kg of blast furnace slag is produced for each 1 ton of molten iron. The temperature of blast furnace slag is 1450-1550 ℃, sensible heat carried by each ton of slag is equivalent to the calorific value of 57kg of standard coal, and the blast furnace slag is a high-grade waste heat resource with higher recovery value. At present, the blast furnace slag is treated by adopting a water quenching process, the slag is flushed into water slag, high-grade sensible heat is transferred into the water slag and wastewater at about 80 ℃, the recycling value is greatly reduced, 0.4-0.5 ton of water is consumed for treating 1 ton of slag, and a large amount of H-rich water is discharged simultaneously2S、SO2Equal pollutionWaste steam of the product. During subsequent resource utilization (such as micronization), 8-15% of water in the granulated slag needs to be dried, and 1200m of water needs to be consumed for each ton of slag3Hot air at 500 ℃. Therefore, the dry treatment is an effective means for effectively recycling the sensible heat of the blast furnace slag and reducing the environmental pollution.
Because the blast furnace slag has the characteristics of low heat conductivity coefficient and viscosity which is sharply increased along with the temperature reduction, the heat exchange of the blast furnace slag is slow, and the waste heat recovery difficulty is high. Therefore, the premise of quickly and efficiently recovering the sensible heat of the blast furnace slag is to quickly granulate the blast furnace slag, increase the heat exchange area and improve the heat transfer efficiency. The rapid cooling of the slag particles not only creates conditions for recovering heat, but also can keep the vitreous body content and activity of the cooled slag particles to meet the requirements of slag micro-powder raw materials, and maintain the smoothness of the existing slag recycling way.
At present, the rapid dry granulation process of the molten slag mainly comprises the following steps: air-crushing, ball-cooling and centrifugal granulation. The wind crushing method cannot be popularized and applied due to large air quantity, large noise and low quality of recovered heat energy. The ball cooling process developed by PW company, namely, a pig casting machine is used for receiving slag, then steel balls are injected to rapidly cool the slag, then heat is recovered, the slag and the steel balls are crushed and separated, and the separated steel balls are conveyed to the position near a blast furnace slag channel for recycling.
The centrifugal granulation method is used as a main flow dry type granulation process of blast furnace slag, a rotary disc or a rotary cup is mainly used as a granulator, the slag is dispersed and cracked into fine molten drops by utilizing centrifugal force, the specific surface area is increased so as to be cooled quickly, and the content and activity of glass bodies of cooled slag granules can meet the requirements of slag micro powder raw materials. At present, dry granulation research and development work is also carried out by siemens-VAI, australian federal scientific and industrial research organization (CSIRO), swedish national institute of metallurgy (Swerea MEFOS), POSCO, beijing general iron and steel research institute, northeast university, Chongqing university, Qingdao studios, Chongqing seydi and the like, but the problems of slag crusting, uneven granularity of granulated slag, slag wool generation and the like exist in the experimental process, and further research and improvement are needed.
The Chinese invention patent ZL201410755689.9 discloses a high-temperature molten slag waste heat recovery system and a recovery method thereof, and the system comprises a molten slag conveying unit, a molten slag granulating unit and a waste heat recovery unit; the slag conveying unit mainly comprises a slag pot and a crown block; the slag granulation unit mainly comprises a rotating cup, a rotating device, a granulation cooling device and a slag particle collecting and cooling device, wherein the granulation cooling device is arranged at the periphery of the rotating cup and the rotating device, and the slag particle collecting and cooling device is arranged at the periphery of the granulation cooling device; the waste heat recovery unit is a waste heat boiler, the heat exchange tube fork rows at the slag particle inlet end in the waste heat boiler are arranged in a downstream mode, and the heat exchange tube fork rows at the slag particle outlet end in the waste heat boiler are arranged in a reverse mode. Although the invention realizes seamless link between high-temperature slag treatment and a production system, the invention is suitable for industrial production operation; however, the slag is easily cooled by long-distance conveying of the slag tank, additional heat supplement is needed, the refractory lining of the steel structure of the granulating disc is easily eroded by the slag, uneven surface can cause uneven distribution of the slag on the surface of the disc, uneven thickness of a liquid film, and large fluctuation of the grain size of granulated slag grains and even granulation failure can be caused.
The Chinese invention patent ZL201010128750.9 discloses a liquid blast furnace slag granulating device, which comprises a pouring gate, a granulator, a primary turntable, a water nozzle, a secondary turntable, a driving device, a central water conveying pipe, a slag hopper and an exhaust pipe; the pouring gate is arranged in the middle of the upper end of the granulator, the upper half part of the granulator adopts a water-cooled wall structure, and the lower half part of the granulator contracts to form a slag hopper; the primary turntable, the water nozzle, the secondary turntable, the driving device and the central water conveying pipe are all arranged on the central line in the granulator; the diameter of the second-stage turntable is larger than that of the first-stage turntable; the water nozzle is positioned between the first-stage turntable and the second-stage turntable, and the outlet direction points to the upper surface of the second-stage turntable; the central water pipe is arranged in the center of the turntable, and the upper part of the central water pipe is connected with the water nozzle; the side wall of the granulator is connected with an exhaust pipe. The invention utilizes the action of centrifugal force and water film explosion force to crush and solidify the liquid blast furnace slag into solid particles, thereby enhancing the granulation effect, reducing the power consumption and equipment investment of a granulation device, and influencing waste heat recovery and utilization by hydraulic slag crushing.
Disclosure of Invention
The invention aims to provide a blast furnace slag granulation heat exchange device based on multi-medium coupling, which can realize dry granulation of blast furnace slag, prolong the service life of a granulator turntable, and has high processing capacity and high heat energy recovery and utilization rate.
The invention is realized by the following steps:
a blast furnace slag granulation heat exchange device based on multi-medium coupling comprises a slag granulation assembly, a slag granule conveying assembly, a waste heat recovery assembly and a tail gas treatment assembly;
the molten slag granulating component comprises a slag runner, a tundish, a rotary granulating mechanism, a granulating cavity and a blast system, wherein the rotary granulating mechanism comprises a granulator bulge, a rotary table, a rotary motor, a spray gun fixing mechanism, a spray gun and a rotary shaft, the rotary table is arranged on the rotary shaft and synchronously rotates with the rotary shaft under the control of the rotary motor, the granulator bulge is connected with the upper end part of the spray gun, a plurality of gas channels are arranged in the granulator bulge, the rotary table is positioned below the granulator bulge, the spray gun is fixed at the central part in the rotary shaft through the spray gun fixing mechanism, and the granulator bulge and the spray gun are fixed and do not rotate; the slag flows form a slag stream through the slag channel and the tundish, the slag stream enters the granulating cavity and falls on the protrusions of the granulator, and the slag stream is dispersed into liquid drops under the auxiliary action of high-pressure gas which is sprayed in by a spray gun and is sprayed out through a gas channel; the air blowing system is arranged at the bottom of the granulating cavity and blows air into the granulating cavity to cool the liquid drops to form solid slag particles;
the slag particle conveying assembly comprises an annular cooler, a blowing system, a high-temperature conveyor, a steel ball, a first bucket elevator, a heat exchanger, a conveyor, a second bucket elevator and a slag particle bin; the ring cooling machine is arranged at the lower part of the granulating cavity and is provided with a slag outlet, the granulated solid high-temperature slag particles are collected and distributed with cooling gas, the slag outlet of the ring cooling machine uniformly sends the received solid high-temperature slag particles to the high-temperature conveyor, the discharge end of the high-temperature conveyor is connected to a top feeding port of the heat exchanger through a first bucket elevator, and the air blowing system is connected to bottom air inlets of the ring cooling machine and the heat exchanger; the steel balls are output to the high-temperature conveyor through a steel ball storage bin arranged above the high-temperature conveyor and contact with slag particles for heat exchange; a discharge port at the bottom of the heat exchanger is connected to an inlet at the top of the slag particle bin through a second bucket elevator by a conveyor;
and the gas inlet port of the waste heat recovery assembly is connected to the gas outlet ports of the slag granulation assembly and the slag granule conveying assembly, and the tail gas treatment assembly is connected to the gas outlet port of the waste heat recovery assembly.
The waste heat recovery assembly comprises a cyclone dust collector, a boiler and a generator, wherein the input end of the cyclone dust collector is connected to the granulating cavity and the top gas outlet of the heat exchanger, and the output end of the cyclone dust collector is connected to the boiler and generates electricity through the generator.
The tail gas treatment component comprises a deep purifier, a fan and a chimney, wherein the air inlet of the deep purifier is connected with the air outlet of the boiler of the waste heat recovery component, and the air outlet of the deep purifier is connected to the air blowing system and the chimney through the fan.
The slag particle conveying assembly further comprises a slag-iron separator, the input end of the slag-iron separator is positioned above the conveyor and used for separating the steel balls and the slag particles, and the input end of the slag-iron separator is connected to the steel ball storage bin.
The middle part of the granulating cavity is of a water jacket structure, molten slag liquid drops collide with the inner wall of the water jacket structure of the granulating cavity, and the granulating cavity at the lower part of the water jacket structure is of a bucket-shaped structure with a wide upper part and a narrow lower part.
The granulating cavity is internally provided with a circular seam structure, the circular cooler is connected with the circular seam structure, the circular cooler is annularly arranged at the bottom of the granulating cavity, and a slag outlet of the circular cooler is connected with the input end of the high-temperature conveyor.
The granulator protrusion is of a conical structure, the plurality of gas channels are arranged along the radial direction of the granulator protrusion, and the granulator protrusion is fixed at the top end of the spray gun through a threaded structure.
The turntable is of a plane disc-shaped structure.
The rotary disc is of a disc-shaped structure with a straight middle part and an arc-shaped and upwarped edge.
Compared with the prior art, the invention has the following beneficial effects:
1. the rotary granulating mechanism is used for shunting the molten slag, the gas channel is used for further dispersing the molten slag film, the centrifugal speed of the molten slag film is accelerated, and meanwhile, the surface of the rotary disc can be cooled and swept, so that a better granulating effect is achieved.
2. The high-temperature slag particles are subjected to twice heat exchange and cooling through the steel balls and the heat exchanger, and are separated from the steel balls through the screening device, so that the collected slag particles can be sent to users regularly and quantitatively, and the steel balls can be recycled to participate in a new heat exchange cycle.
3. The high-temperature gas generated by the invention can be used for power generation or be merged into a pipe network for other heat consumers, and the low-temperature tail gas can be discharged after being purified or recycled to the air blowing system and the heat exchanger for secondary utilization, so that the full utilization of heat energy is realized.
The invention can realize the dry granulation of the blast furnace slag, has better granulation effect, prolongs the service life of the rotary disc of the granulator, has large processing capacity and high heat energy recovery utilization rate, can be applied to the field of blast furnace slag processing of various sizes and models, and has wide application and popularization prospects.
Drawings
FIG. 1 is a sectional view of a blast furnace slag granulation heat exchange device based on multi-medium coupling of the invention;
FIG. 2 is a sectional view of a rotary granulating mechanism in the blast furnace slag granulating heat exchange device based on multi-medium coupling;
fig. 3 is a cross-sectional view taken along the plane B-B in fig. 2.
In the figure, 1 slag runner, 2 tundish, 3 slag stream, 4 rotary granulating mechanism, 41 granulator bulge, 411 gas channel, 42 turntable, 43 rotary motor, 44 spray gun fixing mechanism, 45 spray gun, 46 rotating shaft, 47 bearing, 6 slag granules, 7 granulating cavity, 8 circular cooler, 9 blast system, 10 high temperature conveyor, 11 steel ball, 12 first bucket elevator, 13 heat exchanger, 14 conveyor, 15 slag iron separator, 16 second bucket elevator, 17 slag granule bunker, 18 cyclone dust collector, 19 boiler, 20 generator, 21 deep purifier, 22 fan and 23 chimney.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to the attached figure 1, the blast furnace slag granulation heat exchange device based on multi-medium coupling comprises a slag granulation assembly, a slag granule conveying assembly, a waste heat recovery assembly and a tail gas treatment assembly.
The molten slag granulating component comprises a slag runner 1, a tundish 2, a rotary granulating mechanism 4, a granulating cavity 7 and a blast system 9, please refer to the attached drawings 2 and 3, the rotary granulating mechanism 4 comprises a granulator protrusion 41, a rotary table 42, a rotary motor 43, a spray gun fixing mechanism 44, a spray gun 45 and a rotary shaft 46, the rotary table 42 is coaxially arranged at the top of the rotary shaft 46 and is controlled by the rotary motor 43 to synchronously rotate with the rotary shaft 46, the granulator protrusion 41 is connected with the upper end part of the spray gun 45, a plurality of gas channels 411 are arranged in the granulator protrusion 41, the turntable 42 is positioned below the granulator protrusion 41, the spray gun 45 is fixed at the central part in the rotating shaft 46 through the spray gun fixing mechanism 44, the granulator protrusion 41 and the spray gun 45 are fixed and do not rotate, and the bottom of the spray gun 45 is fixed below the rotating shaft 46 through the spray gun fixing mechanism 44 to play roles of positioning and restraining the spray gun 45; the molten slag flows into the granulating cavity 7 through the slag runner 1 and the tundish 2 to form a molten slag stream 3, the molten slag stream falls on the protrusion 41 of the granulator, and the molten slag stream 3 is sprayed by the spray gun 45 and is dispersed into liquid drops under the auxiliary action of high-pressure gas sprayed from the gas channel 411; the air blowing system 9 is arranged at the bottom of the granulation chamber 7 and blows air into the granulation chamber 7 to cool the liquid droplets to form solid slag particles 6.
The slag particle conveying assembly comprises an annular cooler 8, a blowing system 9, a high-temperature conveyor 10, a steel ball 11, a first bucket elevator 12, a heat exchanger 13, a conveyor 14, a second bucket elevator 16 and a slag particle bin 17; the ring cooling machine (8) is arranged at the lower part of the slit of the granulating cavity 7 and is provided with a slag outlet to receive the solid high-temperature slag granules 6 cooled and collected in the granulating cavity 7, the slag outlet of the ring cooling machine 8 uniformly sends the received solid high-temperature slag granules 6 to the high-temperature conveyer 10, one end of the high-temperature conveyer 10 is arranged below the slag outlet of the ring cooling machine 8 and conveys the solid high-temperature slag granules 6, the discharge end of the high-temperature conveyer 10 is connected to a top feeding port of the heat exchanger 13 through the first bucket elevator 12, and the air blowing system 9 is connected to the ring cooling machine 8 and a bottom air inlet of the heat exchanger 13; the steel balls 11 are output to the high-temperature conveyor 10 through a steel ball storage bin arranged above the high-temperature conveyor 10 and contact with the slag particles 6 for heat exchange; the bottom discharge of the heat exchanger 13 is connected via a conveyor 14 via a second hopper lift 16 to the top inlet of a slag particle bin 17.
And the gas inlet port of the waste heat recovery assembly is connected to the gas outlet ports of the slag granulation assembly and the slag granule conveying assembly, and the tail gas treatment assembly is connected to the gas outlet port of the waste heat recovery assembly.
The waste heat recovery assembly comprises a cyclone dust collector 18, a boiler 19 and a generator 20, wherein the input end of the cyclone dust collector 18 is connected to the granulating cavity 7 and the air outlet at the top of the heat exchanger 13, and the output end of the cyclone dust collector 18 is connected to the boiler 19 and generates electricity through the generator 20, so that the full utilization of heat energy is realized.
The tail gas treatment assembly comprises a deep purifier 21, a fan 22 and a chimney 23, wherein the gas inlet of the deep purifier 21 is connected with the gas outlet of the boiler 19, the gas outlet of the deep purifier 21 is connected to the air blowing system 9 and the chimney 23 through the fan 22, and tail gas reaching the emission standard can be discharged through the chimney 23 or returned to the air blowing system 9 and the heat exchanger 13 for recycling.
The slag particle conveying assembly further comprises a slag-iron separator 15, the input end of the slag-iron separator 15 is positioned above the conveyor 14 and separates the steel balls 11 and the slag particles 6, and the output end of the slag-iron separator 15 is connected to the steel ball storage bin, so that the collection of the slag particles 6 and the recycling of the steel balls 11 are facilitated. The slag-iron separator 15 may be an iron sucker or a vibrating screen.
The middle part of the granulating cavity 7 is of a water jacket structure, the slag particles 6 collide with the inner wall of the water jacket structure of the granulating cavity 7, and the granulating cavity 7 at the lower part of the water jacket structure is of a bucket-shaped structure with a wide upper part and a narrow lower part, so that cooling when the slag particles 6 contact the wall and collection of the cooled slag particles 6 are facilitated.
The lower slag collecting part of the granulating cavity 7 is contracted into a circular seam structure, the circular cooler 8 is annularly arranged at the bottom of the granulating cavity 7 and is connected with the circular seam structure, a slag outlet of the circular cooler 8 is connected with the input end of the high-temperature conveyer 10, and the slag granules 6 fall onto the upper surface of the circular cooler 8 under the combined action of gravity and buoyancy generated by cooling air rising from a gap of the circular seam structure of the circular cooler 8, are collected by the circular cooler 8 and are sent into the high-temperature conveyer 10.
The rotating shaft 46 is relatively fixed with the granulating cavity 7 through a pair of bearings 47, and the bearings 47 are positioned in the middle of the lower end of the granulating cavity 7, so that the rotating shaft 46 can smoothly rotate in the vertical direction, and mutual abrasion between the rotating shaft and the granulating cavity 7 is avoided.
The granulator protrusion 41 is of a conical structure, the plurality of gas channels 411 are arranged along the radial direction of the granulator protrusion 41, and the granulator protrusion 41 is fixed at the top end of the spray gun 45 through a threaded structure, so that a thick liquid film can be ensured to be thinned by the rotary table 42.
The rotary table 42 is of a plane disc structure, or can be of a disc structure with a straight middle part and an upward arc-shaped edge, so that a thick liquid film can fly out along the edge of the rotary table 42 under the action of centrifugal force, the area of the thick liquid film is increased, the liquid film becomes thin, liquid lines and liquid drops can be cut when the thick liquid film is separated from the rotary table 42, and the formation of the slag particles 6 is facilitated.
Example 1:
referring to the attached drawings 1 to 3, the blast furnace slag granulation heat exchange device based on multi-medium coupling comprises a slag granulation assembly, a slag granule conveying assembly, a waste heat recovery assembly and a tail gas treatment assembly. The slag granulating assembly is used for conveying and granulating slag and mainly comprises a slag runner 1 or a slag ladle for conveying the slag, a tundish 2 with a flow control mechanism, a rotary granulating mechanism 4, a granulating cavity 7 and a blast system 9. The slag particle conveying assembly is used for conveying high-temperature slag particles and low-temperature tailings and mainly comprises a circular cooler 8, a high-temperature conveyor 10, steel balls 11, a first bucket elevator 12, a heat exchanger 13, a conveyor 14, a slag-iron separator 15, a second bucket elevator 16 and a slag particle bin 17. The waste heat recovery assembly is used for recovering heat after heat exchange of slag particles, air and steel balls 11 and mainly comprises a cyclone dust collector 18, a boiler 19 and a generator 20. The tail gas treatment component is used for purifying and discharging tail gas and mainly comprises a deep purifier 21, a fan 22 and a chimney 23.
When the blast furnace slag flows out of the slag runner 1 of the blast furnace, the blast furnace slag is directly led into the tundish 2, and the effective volume of the tundish 2 is 3-5m3The received slag is buffered and the flow of slag stream 3 is controlled by a stopper rod flow control mechanism to be relatively stable, such as 1-2 tons/min. The slag stream 3 flows directly onto the granulator projection 41 of the rotary granulation device 4, the slag stream 3 is dispersed by the granulator projection 41 into a thick liquid film which is under gravity and upper slagIs continuously pushed, and is dispersed to the upper surface of a rotating disc (granulating disc) 42 rotating at a high speed along the outer surface of the granulator protrusion 41, so that the primary spreading of the slag stream 3 is realized. The liquid film of the slag falling on the upper surface of the rotary table 42 rapidly flies out along the radial direction of the rotary table 42 under the action of the centrifugal force of the rotary table 42 and the resultant force of the compressed air blown by the spray gun 45, the area is enlarged, the liquid film becomes thin (the liquid film is spread and thinned), when the liquid film is separated from the edge of the rotary table 42, the liquid film is firstly divided into countless liquid lines, then the liquid lines are divided into countless small liquid drops under the action of the surface tension, the small liquid drops are cooled into solid or surface-solidified slag particles 6 by the heat exchange of the low-temperature air blown by the blowing system 9 in the process of flying to the inner wall of the granulation cavity 7, the slag particles 6 collide against the inner wall of the granulation cavity 7 to be cooled again, the slag particles 6 lose viscosity, rebound and are collected on the lower annular cooler 8, the air blown by the lower blowing system 9 is continuously cooled and conveyed to the high-temperature conveyor 10, the slag particles 6 are mixed with the steel balls 11 input from the steel ball storage bin on the high-temperature conveyor 10, then the steel balls are conveyed into a heat exchanger 13 from the upper part through a first bucket elevator 12, heat exchange is carried out on the slag particles 6 and the steel balls 11 in the contact conveying process, then the steel balls 11 and the slag particles 6 are subjected to reverse heat exchange with low-temperature gas entering from the lower part in the heat exchanger 13, the steel balls 11 and the slag particles 6 after cooling are quantitatively conveyed out from the lower part of the heat exchanger 13 in a moving bed mode, wherein the slag particles 6 are conveyed into a temporary slag particle bin 17 through a second bucket elevator 16 to be used as high-quality building material raw materials to be conveyed out of a factory, the steel balls 11 are separated out by an iron absorber (slag-iron separator 15) on a conveyor 14 and are conveyed back to the steel ball bin to continuously participate in heat exchange. The high-temperature gas from the granulation chamber 7 and the heat exchanger 13 is gathered, primarily purified by the cyclone dust collector 18 and then enters the boiler 19, and the generated steam is merged into a pipe network or drives the generator 20 to generate electricity and be connected to the grid. The tail gas after heat exchange and temperature reduction is purified by a deep purifier 21, is pumped out by a fan 22 after reaching the emission standard, is discharged after reaching the standard through a chimney 23, and part of the tail gas returns to the blower system 9 for cyclic utilization.
Preferably, the granulator protrusion 41 is made of heat-resistant steel, the granulator protrusion 41 is connected with the spray gun 45 through threads, 3-6 gas channels 411 are arranged on the granulator protrusion 41, in this embodiment, 5 gas channels 411 are uniformly arranged, high-pressure gas injected by the spray gun 45 is firstly blown to the lower surface of the granulator protrusion 41 to cool the granulator protrusion 41, and then is cut to the upper surface of the rotating disc 42 along the gas channels 411 to play a role in assisting in granulating the molten slag. The upper surface of the turntable 42 is concave, the diameter is 800mm and the rotating speed is 3000rpm and 500 mm, and the turntable 42 can be made of heat-resistant steel and fixed on the rotating shaft 46 by a thread or key connection mode according to the capability of processing slag. The rotating shaft 46 is a hollow structure, is vertically fixed through a pair of bearings 47, and is powered by a transmission mechanism where the motor 43 is located to flexibly rotate. The lance 45 is vertically inserted into the cavity of the rotating shaft 46, and is positioned and restrained by the lance fixing mechanism 44.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A blast furnace slag granulation heat exchange device based on multi-medium coupling is characterized in that: the device comprises a slag granulation component, a slag granule conveying component, a waste heat recovery component and a tail gas treatment component;
the molten slag granulating component comprises a slag runner (1), a tundish (2), a rotary granulating mechanism (4), a granulating cavity (7) and a blast system (9), wherein the rotary granulating mechanism (4) comprises a granulator bulge (41), a turntable (42), a rotary motor (43), a spray gun fixing mechanism (44), a spray gun (45) and a rotating shaft (46), the turntable (42) is arranged on the rotating shaft (46) and synchronously rotates with the rotating shaft (46) under the control of the rotary motor (43), the granulator bulge (41) is connected with the upper end part of the spray gun (45), a plurality of gas channels (411) are arranged in the granulator protrusion (41), the turntable (42) is positioned below the granulator protrusion (41), the spray gun (45) is fixed at the central part in the rotating shaft (46) through a spray gun fixing mechanism (44), and the granulator protrusion (41) and the spray gun (45) are fixed and do not rotate; slag forms a slag stream (3) through a tundish (2) through a slag runner (1), the slag stream enters a granulating cavity (7) and falls on a granulator protrusion (41), and the slag stream (3) is dispersed into liquid drops through high-pressure gas which is sprayed in through a spray gun (45) and is sprayed out through a gas channel (411); the air blowing system (9) is arranged at the bottom of the granulating cavity (7) and blows air into the granulating cavity (7) to cool liquid drops to form solid slag particles (6);
the slag particle conveying assembly comprises an annular cooler (8), a blowing system (9), a high-temperature conveyor (10), steel balls (11), a first bucket elevator (12), a heat exchanger (13), a conveyor (14), a second bucket elevator (16) and a slag particle bin (17); the circular cooler (8) is arranged at the lower part of the granulating cavity (7) and is provided with a slag hole, the slag hole of the circular cooler (8) uniformly sends the received solid slag particles (6) to the high-temperature conveyor (10), the discharge end of the high-temperature conveyor (10) is connected to a top feed inlet of the heat exchanger (13) through a first bucket elevator (12), and the air blowing system (9) is connected to the circular cooler (8) and a bottom air inlet of the heat exchanger (13); the steel balls (11) are output to the high-temperature conveyor (10) through a steel ball storage bin arranged above the high-temperature conveyor (10) and contact with the slag particles (6) for heat exchange; a discharge port at the bottom of the heat exchanger (13) is connected to an inlet at the top of a slag particle bin (17) through a second bucket elevator (16) by a conveyor (14);
and the gas inlet port of the waste heat recovery assembly is connected to the gas outlet ports of the slag granulation assembly and the slag granule conveying assembly, and the tail gas treatment assembly is connected to the gas outlet port of the waste heat recovery assembly.
2. The blast furnace slag granulation heat exchange device based on multi-medium coupling as claimed in claim 1, which is characterized in that: the waste heat recovery assembly comprises a cyclone dust collector (18), a boiler (19) and a generator (20), wherein the input end of the cyclone dust collector (18) is connected to the granulating cavity (7) and the air outlet at the top of the heat exchanger (13), and the output end of the cyclone dust collector (18) is connected to the boiler (19) and generates electricity through the generator (20).
3. The blast furnace slag granulation heat exchange device based on multi-medium coupling as claimed in claim 1, which is characterized in that: the tail gas treatment component comprises a deep purifier (21), a fan (22) and a chimney (23), wherein the air inlet of the deep purifier (21) is connected with the air outlet of a boiler (19) of the waste heat recovery component, and the air outlet of the deep purifier (21) is connected to a blowing system (9) and the chimney (23) through the fan (22).
4. The blast furnace slag granulation heat exchange device based on multi-medium coupling as claimed in claim 1, which is characterized in that: the slag particle conveying assembly further comprises a slag-iron separator (15), the input end of the slag-iron separator (15) is positioned above the conveyor (14) and separates the steel balls (11) and the slag particles (6), and the output end of the slag-iron separator (15) is connected to the steel ball storage bin.
5. The blast furnace slag granulation heat exchange device based on multi-medium coupling as claimed in claim 1, which is characterized in that: the middle part of the granulating cavity (7) is of a water jacket structure, molten slag droplets collide with the inner wall of the water jacket structure of the granulating cavity (7), and the granulating cavity (7) positioned at the lower part of the water jacket structure is of a bucket-shaped structure with a wide upper part and a narrow lower part.
6. The blast furnace slag granulation heat exchange device based on multi-medium coupling as claimed in claim 5, characterized in that: the granulating cavity (7) is internally provided with a circular seam structure, the circular cooler (8) is connected with the circular seam structure, the circular cooler (8) is annularly arranged at the bottom of the granulating cavity (7), and a slag outlet of the circular cooler (8) is connected with the input end of the high-temperature conveyor (10).
7. The blast furnace slag granulation heat exchange device based on multi-medium coupling as claimed in claim 1, which is characterized in that: the granulator protrusion (41) is of a conical structure, the plurality of gas channels (411) are arranged along the radial direction of the granulator protrusion (41), and the granulator protrusion (41) is fixed at the top end of the spray gun (45) through a threaded structure.
8. The blast furnace slag granulation heat exchange device based on multi-medium coupling as claimed in claim 1, which is characterized in that: the rotary disc (42) is of a plane disc-shaped structure.
9. The blast furnace slag granulation heat exchange device based on multi-medium coupling as claimed in claim 1, which is characterized in that: the rotary disc (42) is of a disc-shaped structure with a straight middle part and an arc-shaped and upturned edge.
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| CN114231675B (en) * | 2021-12-27 | 2023-03-21 | 上海宝钢节能环保技术有限公司 | Blast furnace slag dry-method granulating device |
| CN115094168B (en) * | 2022-06-02 | 2024-02-20 | 中节能工业节能有限公司 | Slag recovery system |
| CN115141901B (en) * | 2022-06-02 | 2024-02-20 | 中节能工业节能有限公司 | Slag recovery system |
| CN115231316B (en) * | 2022-09-22 | 2022-12-20 | 山东大学 | Fluidized powder supply system and method based on waste gas and waste residue chilling steel slag |
| CN116551924A (en) * | 2023-05-06 | 2023-08-08 | 广州思酷塑料制品有限公司 | Injection molding device convenient for exhausting |
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