CN108359757B - Liquid slag dry-type centrifugal granulation device - Google Patents
Liquid slag dry-type centrifugal granulation device Download PDFInfo
- Publication number
- CN108359757B CN108359757B CN201810163168.2A CN201810163168A CN108359757B CN 108359757 B CN108359757 B CN 108359757B CN 201810163168 A CN201810163168 A CN 201810163168A CN 108359757 B CN108359757 B CN 108359757B
- Authority
- CN
- China
- Prior art keywords
- air
- granulator
- fixing device
- cooling
- slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses a liquid slag dry-type centrifugal granulating device, which comprises a slag falling pipe, a granulating bin and granulating equipment, wherein the slag falling pipe is arranged at the bottom of the granulating bin; an opening is formed in the center of the top of the granulating bin, a slag dropping pipe extends into the opening, and a refractory material layer is arranged outside the slag dropping pipe and is arranged in a centering mode with granulating equipment; a slag falling pipe fixing device is arranged outside the slag falling pipe extending into the granulating bin; laying a water-cooled wall heating surface in the granulation cabin, wherein the water-cooled wall heating surface adopts a membrane water-cooled wall and is vertically arranged; the wall surface of the granulating bin is also provided with an air film cooling device; the granulation apparatus comprises: the granulator comprises a granulator, a granulator fixing device and a granulator driving device; the granulator is fixed on the granulator fixing device; an air flow channel and a plurality of air ports are arranged in the granulator fixing device. The invention can effectively prevent the slag falling pipe extending into the granulating bin from being broken and falling into the granulating bin, reduce the occurrence of wall sticking of high-temperature granulated slag particles, prevent the swinging and overtemperature of the rotating shaft and ensure the safe and stable operation of the system in the centrifugal granulating process.
Description
Technical Field
The invention relates to the technical field of waste heat recovery of high-temperature liquid slag, in particular to a liquid slag dry centrifugal granulating device.
Background
China is currently the largest iron and steel producing country worldwide. In 2016, the pig iron yield in China is about 7.01 hundred million tons, which accounts for about 60 percent of the total world production, and blast furnace slag containing huge heat is generated in the process of smelting the pig iron. The tapping temperature of the blast furnace slag is generally 1400-1550 ℃, and each ton of slag contains (1260-1880) × 103The sensible heat of kJ, corresponds to 60kg of standard coal. Under the existing iron-making technology in China, 0.3 ton of blast furnace slag is produced as a byproduct for producing 1 ton of pig iron, calculated according to 7.01 million tons of pig iron in China at present, the blast furnace slag can be folded to produce more than about 2.10 million tons, and the sensible heat of the blast furnace slag is equivalent to about 1261.8 million 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. When the dry slag pit method is used for cooling, a large amount of water vapor is generated, and simultaneously a large amount of H is released2S and SO2Gases, corrosion of buildings, destruction of equipment and deterioration of the working environment. Water (W)The slag flushing method wastes a large amount of water resources in the treatment process and generates SO2And H2S and other harmful gases can not effectively recover high-quality waste heat resources contained in the high-temperature liquid slag. At present, the treatment modes cannot meet the urgent requirements of energy conservation and emission reduction in the steel industry, and the dry centrifugal granulation method is widely favored due to the characteristics of low system energy consumption, small and uniform particle size, high added value of products and the like.
In the dry centrifugal granulation process, liquid slag drops on the surface of a granulator rotating at a high speed, is thrown out under the action of centrifugal force and friction force, forms small droplets under the action of surface tension, and the small droplets perform forced convection heat exchange with a heat transfer medium (generally air) in a space and perform radiation heat exchange with the surrounding environment to reduce the temperature of the small droplets so as to perform phase change and form a solidified layer. As the temperature is further reduced, the droplets gradually turn into small solid particles. The current dry granulation technology generally has the following problems in the liquid slag granulation process:
1. the wall sticking phenomenon of the granulated slag particles. The reason is mainly that: the tangential speed provided by the granulator rotating at a high speed for the granulated slag particles is very high, so that on one hand, the granulated slag particles have a long horizontal flying distance and can reach the wall surface of the granulating bin; on the other hand, although convection and radiation heat exchange exist, the flight time of the granulated slag particles is short, the outer surfaces of the granulated slag particles are still not solidified or the solidified layers are very thin, so that the granulated slag particles are bonded on the wall surface of the granulating bin to influence radiation heat exchange, and are seriously bonded into large blocks to cause accidents, so that the system is shut down and overhauled, a large amount of manpower and material resources are wasted, and the subsequent waste heat recovery and the recovery of high-quality slag particles are influenced. Therefore, it is necessary to take appropriate measures to prevent the occurrence of the wall-sticking phenomenon.
2. The slag falling pipe extending into the granulation chamber is easy to break. In the granulation process, the slag falling pipe is directly contacted with the slag at the temperature of 1500 ℃, so that the slag falling pipe is easily corroded, scoured and abraded by the high-temperature slag. On one hand, the broken slag falling pipe is directly hit to the granulating equipment to damage the granulating equipment, and needs to be overhauled and replaced when serious, so that economic loss is caused; on the other hand, after the slag falling pipe is broken, the high-temperature slag loses guidance, large-area scouring is carried out on the granulator and the driving equipment thereof, so that the granulator and the driving equipment thereof are damaged, the whole granulating device is directly scrapped when the granulator is serious, shutdown and replacement are needed, and a large amount of manpower and financial resources are wasted. Therefore, some measures are required for the slag falling pipe extending into the granulation chamber to prevent the slag falling pipe from breaking and falling.
3. The swing of the rotating shaft in the granulating process. The longer rotating shaft rotates at high speed in the granulating process, so that the rotating shaft can swing, the increase of the rotating speed of the rotating shaft is limited, and the granulation is influenced. Therefore, measures are required to prevent the swing of the rotating shaft.
4. The over-temperature problem of the rotating shaft in the granulating process. The temperature of the liquid slag flowing into the granulating bin is as high as 1400 ℃, and in such a high-temperature environment, the strength of the rotating shaft can be reduced, so that the operation of the granulator is unstable, and the granulating effect is influenced. Therefore, measures are required to prevent the shaft from being overheated.
Disclosure of Invention
The invention aims to provide a liquid slag dry centrifugal granulation device, which aims to solve the problems that in the current liquid slag dry centrifugal granulation process, granulated slag particles are adhered to the wall, a slag falling pipe extending into a granulation bin is easy to break, a rotating shaft swings and the rotating shaft is over-temperature.
In order to achieve the purpose, the invention adopts the technical scheme that:
a liquid slag dry-type centrifugal granulation device comprises a slag falling pipe, a granulation bin and granulation equipment; an opening is formed in the center of the top of the granulating bin, a slag dropping pipe extends into the opening, and a refractory material layer is arranged outside the slag dropping pipe and is arranged in a centering mode with granulating equipment; a slag falling pipe fixing device is arranged outside the slag falling pipe extending into the granulating bin; laying a water-cooled wall heating surface in the granulation cabin, wherein the water-cooled wall heating surface adopts a membrane water-cooled wall and is vertically arranged; the wall surface of the granulating bin is also provided with an air film cooling device; the granulation apparatus comprises: the granulator comprises a granulator, a granulator fixing device and a granulator driving device; the granulator is fixed on the granulator fixing device; an airflow channel is arranged in the granulator fixing device, and an expanded heating surface is arranged at the bottom of the granulator fixing device, which is in contact with the granulator; the top of the granulator fixing device is provided with a plurality of first air ports, and the air outlet angle of the first air ports at the top is intersected with the edge inclination angle of the granulator and used for carrying out external force crushing on a liquid film or a liquid wire formed in the granulation process; a plurality of second air ports are arranged on the side surface of the granulator fixing device, and the second air ports are parallel to or crossed with the edge of the granulator in an inclined angle and are used for cooling liquid drops formed by liquid filament breakage in the granulation process; the first tuyere and the second tuyere are communicated with the airflow channel.
Furthermore, the slag falling pipe fixing device is a conical cylinder or a spiral cold pipe surrounding the outer part and the bottom of the slag falling pipe, and cooling fluid is introduced into the spiral cold pipe.
Furthermore, the outside of the slag falling pipe fixing device is coated with a refractory material which can resist the temperature of more than 1400 ℃.
Further, the cooling fluid may be water, air, nitrogen, or the like.
Further, the granulator further comprises a granulator driving device and a shaft cooling air duct; the granulator driving device comprises a motor and a rotating shaft; the output shaft of the motor is fixedly connected with the lower end of the rotating shaft; the upper end of the rotating shaft is fixedly connected with the bottom of the granulator fixing device; a plurality of temperature-resistant blades are arranged on the rotating shaft; the shaft cooling air duct comprises a motor sealing cover, an air pipe inner sleeve, a shaft sleeve and a rotating shaft; the sealing cover surrounds the periphery of the motor, and the air pipe inner sleeve and the shaft sleeve are sleeved on the periphery of the rotating shaft; inner rings of the temperature-resistant thrust bearing and the temperature-resistant positioning bearing are fixed on the rotating shaft, and outer rings of the temperature-resistant thrust bearing and the temperature-resistant positioning bearing are fixed on the inner wall of the air pipe inner sleeve; the shaft sleeve is fixed between the outer ring of the temperature-resistant bearing at the top of the shaft sleeve and the outer ring of the temperature-resistant bearing at the lower part of the shaft sleeve, and surrounds the temperature-resistant blade; the temperature-resistant thrust bearing and the temperature-resistant positioning bearing are both provided with air supply flow channels; the sealing cover is fixedly connected with the air pipe inner sleeve and communicated with the air pipe inner sleeve through a vent; an air pipe outer sleeve is arranged on the periphery of the air pipe inner sleeve, an annular cooling air channel is formed between the air pipe inner sleeve and the air pipe outer sleeve, and a plurality of air caps are annularly arranged at the top of the annular cooling air channel; the bottom of the air pipe outer sleeve is provided with an annular cooling air duct air inlet.
Further, shaft cooling air enters from air openings of the sealing cover, most of the shaft cooling air enters into an air flow channel of the granulator fixing device after passing through the shaft sleeve to cool the shaft, a plurality of first air openings and second air openings which are annularly and uniformly distributed on the top and the side wall of the granulator fixing device enter into the granulation bin, and a small part of the shaft cooling air enters into the granulation bin from a narrow gap between the granulator fixing device and the air pipe inner sleeve.
Further, the air outlet of the blast cap is lower than the air outlets of the first air port and the second air port.
Furthermore, the bottom of the rotating shaft is provided with a temperature-resistant thrust bearing, the middle part and the upper part of the rotating shaft are provided with one or more temperature-resistant positioning bearings, and the positioning bearing at the uppermost part is close to the bottom of the granulator fixing device as much as possible.
Further, the air film cooling device arranged on the inner wall of the granulating bin is positioned at the height position of the granulator; the air film cooling devices are arranged in one row or a plurality of rows; the air film cooling device is a nozzle or a strip-shaped nozzle, adheres to the wall or is arranged close to the wall on the four walls of the granulation cabin, sprays cooling medium which can be air, nitrogen and the like to form an annular edge air film; the distance between the air film cooling device and the wall surface of the granulating bin, the outlet air speed and the air outlet angle can be adjusted.
Furthermore, an air outlet of the air film cooling device is provided with an air net, and the air net is made of refractory materials.
Further, there are three ways of generating shaft cooling air:
the method comprises the following steps that firstly, cooling air is generated by a fan and enters from an air port of a sealing cover, most of the cooling air flows out through an air flow channel of a granulator fixing device, and the small cooling air flows out from a narrow gap between the fixing device and an inner sleeve of an air pipe;
in the second mode, the temperature-resistant blades on the rotating shaft rotate at high speed along with the rotating shaft to generate cooling air, most of the cooling air flows out through the airflow channel of the granulator fixing device, and a small part of the cooling air flows out from a narrow gap between the fixing device and the air pipe inner sleeve;
and in the third mode, the air outlet of the fan is matched with the high-speed rotating air outlet of the temperature-resistant blade to serve as shaft cooling air, and the shaft cooling air duct and the rotating shaft are cooled.
Compared with the prior art, the invention has the following beneficial effects:
(1) the slag falling pipe fixing device is arranged outside the slag falling pipe extending into the granulating bin, and is used for fixing the slag falling pipe extending into the granulating bin, so that the broken slag falling pipe can be prevented from falling into the granulating bin, and on one hand, the broken slag falling pipe is directly hit onto granulating equipment to damage the granulating equipment; on the other hand, after the fracture, the high-temperature slag loses guidance, large-area scouring is carried out on the granulator and the driving device thereof, so that the granulator and the driving device thereof are damaged, serious accidents are caused, and huge economic loss is brought.
(2) The air film cooling device is arranged on the inner wall surface of the granulating bin, the sprayed air flow can form an annular edge air film, and the high-temperature granulated slag particles flying to the wall surface of the granulating bin can be cooled on the premise of not disturbing the flying track of the granulated slag particles by adjusting the distance between the air film cooling device and the wall surface, the outlet air speed and the air outlet angle, so that wall adhesion and accidents are prevented.
(3) The granulator fixing device is internally provided with an airflow channel and can be provided with an expansion heating surface, so that most of shaft cooling air enters the airflow channel of the granulator fixing device to cool the granulator fixing device in the centrifugal granulation process.
(4) The top of the granulator fixing device is provided with a plurality of air ports, and the air outlet angle of the air ports at the top is intersected with the edge inclination angle of the granulator, so that a liquid film or a liquid wire formed in the granulation process can be crushed by external force, and the granulation effect is enhanced. The side surface of the granulator fixing device is provided with a plurality of air ports, the air ports are parallel to or crossed with the edge inclination angle of the granulator, and liquid drops formed by liquid filament breakage in the granulation process can be cooled, so that the vitreous body conversion rate of the liquid drops is improved.
(5) One or more temperature-resistant positioning bearings are arranged on the rotating shaft, and the positioning bearing at the uppermost part should be close to the bottom of the granulator fixing device as much as possible, so that the situation that the rotating shaft rotating at a high speed swings due to insufficient precision of a mechanical structure to influence the granulation effect can be improved, and the service life of equipment can be prolonged.
(6) The rotating shaft is provided with one-stage, two-stage or multi-stage small temperature-resistant blades, and in the granulating process, the rotating shaft drives the temperature-resistant blades to rotate at a high speed, so that on one hand, flowing power of a shaft cooling air channel can be generated, cooling of shaft cooling air to the shaft and the granulator fixing device is accelerated, and on the other hand, the temperature-resistant blades can also be used as fin structures, and the integral heat dissipation of the rotating shaft is enhanced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of a liquid slag dry centrifugal granulation apparatus according to the present invention;
FIG. 2 is a schematic view of a granulation apparatus;
fig. 3 is a schematic view of a granulator fixture.
201-a slag falling pipe; 202-a layer of refractory material; 203-outlet annular collection header; 204-granulator securing means; 205-granulation chamber; 206-membrane wall heating surface; 207-film cooling device; 208-a water inlet header; 209-motor; 210-a sealing cover; 211-a coupling; 212-temperature resistant thrust bearings; 216-air duct outer sleeve; 217-air duct inner sleeve; 218-a vent; 219-a granulator; 220-blast cap; 221-temperature resistant positioning bearing; 222-a shaft sleeve; 223-a rotating shaft; 224-temperature resistant blades; 225-annular air port; 226-a vent; 227-sealing the cover tuyere; 232-granulator fixing means; 233-airflow channel; 234-extended heated surface; 235-a second tuyere; 236-first tuyere.
Detailed Description
Referring to fig. 1 to 3, the liquid slag dry-type granulation apparatus of the present invention includes a slag dropping pipe 201, a granulation bin 205, and granulation equipment;
the granulating bin 205 is square or round, and the upper part of the granulating bin is flat-topped or dome-shaped; an opening is formed in the center of the top of the granulating bin 205 for the slag falling pipe 201 to extend into, and a refractory material layer 202 is arranged outside the slag falling pipe 201 and is arranged in a centering manner with granulating equipment; a water-cooled wall heating surface 206 is laid inside the granulating bin 205, and the heating surface adopts a membrane water-cooled wall and is vertically arranged; the bottom of the granulation bin 5 is provided with a water inlet header 208, and the top of the granulation bin is provided with an outlet annular collecting header 203; the water wall heating surface 206 is communicated with a water inlet header 208 and an outlet annular collecting header 203; the wall surface of the granulation cabin 5 is provided with an air film cooling device 207 for cooling the granulated slag particles flying to the wall surface of the granulation cabin.
The external part of the slag falling pipe 201 extending into the granulating bin 205 is provided with a slag falling pipe fixing device 204, the fixing device has a plurality of structures, for example, the external part of the slag falling pipe is provided with a conical cylinder, the external part and the bottom of the slag falling pipe are surrounded by a spiral cold pipe with the diameter of the spiral being continuously reduced, the spiral cold pipe is filled with cooling water or cooling gas medium, and the like, the slag falling pipe 201 extending into the granulating bin 205 can be fixed, the slag falling pipe which is broken due to the direct corrosion and the scouring abrasion of high-temperature slag is prevented from falling into the granulating bin, and on one hand, the slag falling pipe is directly smashed on granulating equipment to damage the; on the other hand, the high-temperature slag is not guided, and large-area scouring is carried out on the granulator and the driving device thereof, so that the granulator and the driving device thereof are damaged, serious accidents are caused, and huge economic loss is brought. The outside of the slag falling pipe fixing device 204 is coated with a refractory material which can resist the temperature of more than 1400 ℃ so as to prevent the slag falling pipe fixing device from being damaged by overtemperature; the slag falling pipe fixing device 204 can be filled with cooling water or cooling gas media such as air and nitrogen to prevent the slag falling pipe fixing device from being damaged due to overtemperature, wherein one source of the water is the outlet annular collecting header 203.
One or more rows of air film cooling devices 207, such as nozzles, strip-shaped nozzles and the like, are attached to the wall of the granulation chamber or arranged close to the wall, and sprayed cooling media, such as air, nitrogen and the like, form an annular edge air film; an air net is arranged on an air outlet of the air film cooling device 207, is made of refractory materials and is used for preventing flying high-temperature granulated slag particles from flying into a nozzle air inlet, so that the nozzle is damaged and the cooling effect is influenced; the air film cooling devices 7 arranged on the four walls of the granulation chamber are located near the level of the granulator 219. The distance between the air film cooling device and the wall surface, the outlet air speed and the air outlet angle are adjusted, so that the high-temperature granulated slag particles flying to the wall surface of the granulating bin can be cooled on the premise of not disturbing the flying track of the granulated slag particles, and the wall adhesion is prevented.
The granulation apparatus comprises: a granulator 219, a granulator fixing device 232, a granulator driving device; the granulator 219 is disc-shaped or cup-shaped, the edge inclination angle is 30-60 degrees, and the center is provided with a guide cone; the granulator 219 is fixed to a granulator fixing device 232; an airflow channel 233 is arranged in the granulator fixing device 232; an extended heated surface 234, such as annular fins, is provided in the bottom of the granulator fixture 232 that contacts the granulator 219 to better cool the granulator fixture; the top of the granulator fixing device 232 is provided with a plurality of air ports 236, the air outlet angle of the air ports at the top is intersected with the edge inclination angle of the granulator, and the liquid film or the liquid filaments formed in the granulation process can be crushed by external force, so that the granulation effect is enhanced; the lateral surface of the granulator fixing device 232 is provided with a plurality of air ports 235, the air ports are parallel to or crossed with the edge inclination angle of the granulator, and can cool liquid drops formed by liquid filament breakage in the granulation process, so that the glass body conversion rate of the liquid drops is improved. The tuyere 236 and the tuyere 235 communicate with the air flow passage 233.
The granulator driving means includes a motor 209, a sealing cap 210, a rotating shaft 223, a shaft sleeve 222, an air duct inner sleeve 217, an air duct outer sleeve 216, a hood 220, and the like. The motor 209 is connected with the rotating shaft 223 through a coupler 211; the rotating shaft is provided with a plurality of temperature-resistant blades 224; the bottom of the rotating shaft 223 is provided with a temperature-resistant thrust bearing 212, the middle part and the upper part of the rotating shaft are provided with one or more temperature-resistant positioning bearings 221, wherein the positioning bearing at the uppermost part should be as close to the bottom of the granulator fixing device 232 as possible, so that the situation that the granulation effect is influenced by the swinging of the rotating shaft rotating at a high speed due to the inaccurate mechanical structure can be improved, and the service life of the equipment can be prolonged.
The shaft cooling air duct includes a motor can 210, an air duct inner sleeve 217, a shaft sleeve 222, and a rotating shaft 223. The sealing cover 210 surrounds the periphery of the motor 209, and the air duct inner sleeve 217 and the shaft sleeve 222 are sleeved on the periphery of the rotating shaft 223; the bottom of the rotating shaft 223 is provided with a temperature-resistant thrust bearing 212, the middle part and the upper part of the rotating shaft are provided with one or more temperature-resistant positioning bearings 221, wherein the positioning bearing at the uppermost part should be as close to the bottom of the granulator fixing device as possible, so that the situation that the rotating shaft rotating at a high speed swings due to insufficient precision of a mechanical structure to influence the granulation effect can be improved, and the service life of equipment can be prolonged; inner rings of the temperature-resistant thrust bearing 212 and the temperature-resistant positioning bearing 221 are fixed on the rotating shaft 223, and outer rings of the temperature-resistant thrust bearing and the temperature-resistant positioning bearing are fixed on the inner wall of the air pipe inner sleeve 217; the shaft sleeve 222 is fixed between the outer ring of the temperature-resistant bearing at the top and the outer ring of the temperature-resistant bearing at the lower part thereof, and surrounds the temperature-resistant blade 224 therein; the temperature-resistant thrust bearing 212 and the temperature-resistant positioning bearing 221 are respectively provided with an air supply flow channel. The granulator fixing device 232 is fixed to the top of the rotating shaft 223.
The sealing cover 210 is fixedly connected with the air pipe inner sleeve 217 and is communicated with the air vent 226, shaft cooling air enters from an air port 227 of the sealing cover, after cooling the rotating shaft 223 through the inside of the shaft sleeve 222, most of the shaft cooling air enters into an air flow channel 233 of the granulator fixing device 232, a plurality of air ports 236 and air ports 235 which are annularly and uniformly distributed on the top and the side wall of the granulator fixing device 232 enter into a granulation bin, and a small part of the shaft cooling air enters into the granulation bin from a narrow gap between the granulator fixing device 232 and the air pipe inner sleeve 217. An air pipe outer sleeve 216 is arranged on the periphery of the air pipe inner sleeve 217, an annular cooling air duct is formed between the air pipe outer sleeves 216 and arranged on the periphery of the air pipe inner sleeve 217, a plurality of air caps 220 are annularly arranged on the top of the annular cooling air duct, and air outlets of the air caps 220 are lower than air outlets 236 and 235. An annular cooling air duct air inlet 225 is formed at the bottom of the air duct outer sleeve 216.
In the present invention, the granulator securing device 232 is composed of a left and a right part, and is secured by pins and hoops. When the granulator 219 is damaged, the pins are removed, the granulator 219 and the granulator fixing device 232 can be removed, the pins and the anchor ear are removed, the left and right parts of the granulator fixing device 232 can be detached, and the granulator 219 can be removed after the annular hoop is removed. When the granulator 219 cracks, the cracked granulator 219 cannot be thrown away due to the existence of the granulator base and the fixing device, and meanwhile, liquid slag cannot directly drip on the transmission device and the motor 209, so that the system safety is ensured before shutdown and overhaul. Meanwhile, only the granulator 219 needs to be replaced, thereby reducing the cost of replacing the whole granulation device due to damage of the conventional granulator 219. A streamline flow channel 233 is arranged in the granulator fixing device 232; meanwhile, the gap between the side surface of the bottom of the granulator base and the air duct inner sleeve 217 is small, so that most of the air sent from the lower part of the granulator base can enter the streamline flow channel 233 to cool the granulator fixing device 232, and the air sent from the granulator base can blow to the edge of the granulator 219 to strengthen granulation.
In the invention, the hollow flange is adopted to connect the rotating shaft 223 and the granulator fixing device 232, and the hollow flange ensures that an air heat insulation layer is arranged between the granulator base and the rotating shaft 223 to block heat transfer between the granulator 219 and the rotating shaft 223, so that the heat of the granulator base is not transferred to the rotating shaft 223, the granulator 219 is ensured to run safely and stably, and the granulation effect is better realized.
There are three ways of generating shaft cooling air: in the first mode, cooling air is generated by a fan and enters from an air opening 227 of a sealing cover, most of the cooling air enters a granulating bin through an annular air duct of a fixing device of the granulator, and the small cooling air enters the granulating bin from a narrow gap between the fixing device and an inner sleeve 217 of an air pipe; in the second mode, the one-stage, two-stage or multi-stage small temperature-resistant blades 224 are arranged on the rotating shaft 223, cooling air is generated by high-speed rotation of the rotating shaft, most of the cooling air enters the granulating bin through the annular air duct of the granulator fixing device 232, and the small cooling air enters the granulating bin from a narrow gap between the fixing device and the air pipe inner sleeve 217. The rotating shaft 223 is provided with one-stage, two-stage or multi-stage small temperature-resistant blades 224 which rotate at high speed along with the rotating shaft 223, on one hand, the flowing power of a shaft cooling air channel can be generated, the cooling of shaft cooling air to the shaft and the granulator fixing device is accelerated, and on the other hand, the temperature-resistant blades 224 can also be used as a fin structure, so that the integral heat dissipation of the rotating shaft 223 is enhanced; and in the third mode, the air outlet of the fan is matched with the high-speed rotating air outlet of the small temperature-resistant blade to serve as shaft cooling air, and parts such as a shaft cooling air channel, a rotating shaft and the like are cooled.
Finally, it should be noted that: the above embodiments are only used to illustrate the present invention and not to limit the technical solutions described in the present invention; thus, while the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted; all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and protected by the following claims.
Claims (7)
1. A liquid slag dry-type centrifugal granulation device is characterized in that: comprises a slag falling pipe (201), a granulation bin (205) and granulation equipment;
an opening is formed in the center of the top of the granulating bin (205) for a slag dropping pipe (201) to extend into, and a refractory material layer (202) is arranged outside the slag dropping pipe (201) and is arranged in a centering mode with granulating equipment; a slag falling pipe fixing device (204) is arranged outside the slag falling pipe (201) extending into the granulating bin (205); a water-cooled wall heating surface (206) is laid in the granulating bin, and the water-cooled wall heating surface adopts a membrane water-cooled wall and is vertically arranged; the wall surface of the granulating bin (205) is also provided with an air film cooling device (207);
the granulation apparatus comprises: a granulator (219), a granulator securing device (232) and a granulator drive; the granulator is fixed on a granulator fixing device (232); an air flow channel (233) is arranged in the granulator fixing device, and an extended heating surface (234) is arranged at the bottom of the granulator fixing device, which is contacted with the granulator; the top of the granulator fixing device is provided with a plurality of first air ports (236), and the air outlet angle of the first air ports at the top is intersected with the edge inclination angle of the granulator and is used for carrying out external force crushing on a liquid film or a liquid wire formed in the granulation process; a plurality of second air ports (235) are arranged on the side surface of the granulator fixing device (232), and the second air ports are parallel to or crossed with the edge of the granulator in an inclined angle and are used for cooling liquid drops formed by liquid filament breakage in the granulation process; the first air port and the second air port are communicated with the air flow channel (233); the granulator driving device is used for driving the granulator to rotate;
the slag falling pipe fixing device is a conical cylinder or a spiral cold pipe surrounding the outer part and the bottom of the slag falling pipe (201), and cooling fluid is introduced into the spiral cold pipe;
the shaft cooling air duct is also included;
the granulator driving device comprises a motor (209) and a rotating shaft (223); the output shaft of the motor (209) is fixedly connected with the lower end of the rotating shaft (223); the upper end of the rotating shaft is fixedly connected with the bottom of the granulator fixing device (232); a plurality of temperature-resistant blades (224) are arranged on the rotating shaft;
the shaft cooling air duct comprises a motor sealing cover (210), an air duct inner sleeve (217), a shaft sleeve (222) and a rotating shaft (223); the sealing cover (210) surrounds the periphery of the motor (209), and the air pipe inner sleeve (217) and the shaft sleeve (222) are sleeved on the periphery of the rotating shaft (223); inner rings of the temperature-resistant thrust bearing (212) and the temperature-resistant positioning bearing (221) are fixed on the rotating shaft (223), and outer rings of the temperature-resistant thrust bearing and the temperature-resistant positioning bearing are fixed on the inner wall of the air pipe inner sleeve (217); the shaft sleeve (222) is fixed between the outer ring of the temperature-resistant bearing at the top of the shaft sleeve and the outer ring of the temperature-resistant bearing at the lower part of the shaft sleeve, and surrounds the temperature-resistant blade (224) therein; the temperature-resistant thrust bearing (212) and the temperature-resistant positioning bearing (221) are respectively provided with an air supply flow channel (218);
the sealing cover (210) is fixedly connected with the air pipe inner sleeve (217) and is communicated with the air pipe inner sleeve through a vent (226);
an air pipe outer sleeve (216) is arranged on the periphery of the air pipe inner sleeve (217), an annular cooling air channel is formed between the air pipe inner sleeve (217) and the air pipe outer sleeve (216), and a plurality of air caps (220) are annularly arranged at the top of the annular cooling air channel; the bottom of the air pipe outer sleeve is provided with an annular cooling air duct air inlet (225);
the air film cooling device (207) arranged on the inner wall of the granulating bin is positioned at the height position of the granulator;
the film cooling devices (207) are arranged in one row or a plurality of rows; the air film cooling device (207) is a nozzle or a strip-shaped nozzle, adheres to the wall or is arranged close to the wall on the four walls of the granulation cabin, sprays cooling medium which is air or nitrogen to form an annular edge air film; the distance between the air film cooling device and the wall surface of the granulating bin, the outlet air speed and the air outlet angle can be adjusted.
2. The liquid slag dry centrifugal granulation device as claimed in claim 1, wherein the slag falling pipe fixing device (204) is externally coated with a refractory material capable of resisting a temperature of 1400 ℃ or higher.
3. The liquid slag dry centrifugal granulation device as claimed in claim 1, wherein the cooling fluid is water, air or nitrogen.
4. The liquid slag dry centrifugal granulation device according to claim 1, wherein: shaft cooling air enters from air ports of the sealing cover, most of the shaft cooling air enters into an air flow channel of the granulator fixing device after passing through the shaft sleeve to cool the shaft, a plurality of first air ports and second air ports which are annularly and uniformly distributed on the top and the side wall of the granulator fixing device enter into a granulation bin, and a small part of the shaft cooling air enters into the granulation bin from a narrow gap between the granulator fixing device and an air pipe inner sleeve.
5. The liquid slag dry centrifugal granulation device according to claim 1, wherein: the air outlet of the blast cap is lower than the air outlets of the first air port and the second air port.
6. The liquid slag dry centrifugal granulation device according to claim 1, wherein: an air outlet of the air film cooling device (207) is provided with an air net which is made of refractory materials.
7. The liquid slag dry centrifugal granulation device as claimed in claim 1, wherein the shaft cooling air is generated in three ways:
in the first mode, cooling air is generated by a fan and enters from an air port (227) of a sealing cover, most of the cooling air flows out through an air flow channel (233) of a granulator fixing device, and the small cooling air flows out from a narrow gap between the fixing device and an inner sleeve (217) of an air pipe;
in the second mode, the temperature-resistant blades (224) on the rotating shaft (223) rotate at high speed along with the rotating shaft to generate cooling air, most of the cooling air flows out through the air flow channel (233) of the granulator fixing device (232), and the small part of the cooling air flows out from a narrow gap between the fixing device and the air pipe inner sleeve (217);
and in the third mode, the air outlet of the fan is matched with the high-speed rotating air outlet of the temperature-resistant blade to serve as shaft cooling air, and the shaft cooling air duct and the rotating shaft are cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810163168.2A CN108359757B (en) | 2018-02-26 | 2018-02-26 | Liquid slag dry-type centrifugal granulation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810163168.2A CN108359757B (en) | 2018-02-26 | 2018-02-26 | Liquid slag dry-type centrifugal granulation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108359757A CN108359757A (en) | 2018-08-03 |
| CN108359757B true CN108359757B (en) | 2020-03-17 |
Family
ID=63003309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810163168.2A Active CN108359757B (en) | 2018-02-26 | 2018-02-26 | Liquid slag dry-type centrifugal granulation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108359757B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111074021A (en) * | 2019-12-04 | 2020-04-28 | 西安交通大学 | Uniform flow field air outlet structure for liquid slag dry-type centrifugal granulation system |
| CN111020078B (en) * | 2019-12-04 | 2020-11-10 | 西安交通大学 | Slag falling pipe fixing device with preheating and cooling functions |
| CN115725805B (en) * | 2022-12-01 | 2024-04-12 | 中冶赛迪上海工程技术有限公司 | Slag granulating equipment, slag granulating system and cooling method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5540895A (en) * | 1994-06-03 | 1996-07-30 | Paul Wurth S.A. | Device for the treatment of mixture of steam and air contaminated with sulphurous gases, formed during the granulation and dehydration of blast furnace slag |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282447B (en) * | 2016-09-21 | 2018-07-03 | 重庆大学 | There is the slag dry granulation waste-heat recovery device of self-regulation and Anti-slagging |
| CN106939363B (en) * | 2017-02-28 | 2019-10-11 | 西安交通大学 | For molten slag dry-type centrifugal granulation and the system and control method of waste heat recycling |
-
2018
- 2018-02-26 CN CN201810163168.2A patent/CN108359757B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5540895A (en) * | 1994-06-03 | 1996-07-30 | Paul Wurth S.A. | Device for the treatment of mixture of steam and air contaminated with sulphurous gases, formed during the granulation and dehydration of blast furnace slag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108359757A (en) | 2018-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108330233B (en) | Liquid slag dry centrifugal granulation and waste heat recovery system with slag caching and flow control functions | |
| CN108359756B (en) | Dry centrifugal granulation and waste heat recycling system for liquid slag | |
| CN108359757B (en) | Liquid slag dry-type centrifugal granulation device | |
| CN105624348B (en) | One kind is used for high-temperature liquid state slag granulating system | |
| CN105624347B (en) | A kind of liquid high-temperature slag granulation and waste-heat recovery device | |
| CN106868238B (en) | One kind being used for the granulated granulator system of molten slag | |
| CN103540698B (en) | Steel slag granulating and afterheat recycling device | |
| CN112146446B (en) | Blast furnace slag granulation heat exchange device based on multi-medium coupling | |
| WO2018157451A1 (en) | Control system and method for dry centrifugal granulation of liquid-state slags | |
| CN108330232B (en) | Liquid slag dry centrifugal granulating slag particle size control method | |
| CN108411053B (en) | Liquid slag granulation equipment with lifting function and driving device | |
| CN108330236B (en) | Liquid slag dry centrifugal granulating slag particle quality control method | |
| CN101824499A (en) | Liquid blast furnace slag granulation device and granulation method thereof | |
| CN109385496B (en) | Liquid slag mechanical centrifugal granulation anti-bonding device and preheating method thereof | |
| CN108285942B (en) | Granulator with cooling function and driving system thereof | |
| CN104141020A (en) | Evaporator and high temperature molten slag dry process waste heat recovery system | |
| CN203559060U (en) | Steel slag granulating device | |
| CN112501366B (en) | Smelt slag double-deck centrifugal granulation device with air quenching function | |
| CN106702046B (en) | A kind of driving of granulator and cooling device | |
| CN114231675B (en) | Blast furnace slag dry-method granulating device | |
| CN104805238B (en) | Slag/calcium carbide cools down granulation apparatus | |
| CN114045366B (en) | Lower exhaust dry granulation device | |
| CN219174524U (en) | Device for rapidly cooling slag by utilizing atomizing nozzle | |
| CN215892375U (en) | Slag discharging system of hazardous waste melting furnace | |
| CN117778639A (en) | Gas quenching strengthening granulating device for molten high-temperature materials |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220915 Address after: 215600 No. 1, Southeast Avenue, Zhangjiagang, Suzhou, Jiangsu (Zhangjiagang Economic and Technological Development Zone) Patentee after: SUZHOU HAILU HEAVY INDUSTRY Co.,Ltd. Address before: Beilin District Xianning West Road 710049, Shaanxi city of Xi'an province No. 28 Patentee before: XI'AN JIAOTONG University |
|
| TR01 | Transfer of patent right |