WO2019161637A1

WO2019161637A1 - Liquid molten slag dry-type centrifugal granulated slag particle size control method

Info

Publication number: WO2019161637A1
Application number: PCT/CN2018/096520
Authority: WO
Inventors: 王树众; 张茜; 赵军; 马立伟; 吴志强; 孟海鱼
Original assignee: 西安交通大学
Priority date: 2018-02-26
Filing date: 2018-07-20
Publication date: 2019-08-29
Also published as: CN108330232A; CN108330232B; US20200208230A1

Abstract

A liquid molten slag dry-type centrifugal granulated slag particle size control method based on a liquid molten slag dry-type centrifugal graining system, the liquid molten slag dry-type centrifugal graining system comprising a temperature control unit, a flow control unit and a granulator control unit; the temperature control unit is used for controlling high-temperature molten slag inside a liquid melting buffer storage device to be maintained in a set temperature range and controlling the temperature of outflow molten slag from the buffer storage device to be maintained in a set temperature range; the flow control unit is used for controlling the flow rate of the high-temperature outflow molten slag from the buffer storage device to be in a set range and guaranteeing the stability of the flow rate; and the granulator control unit is used for controlling a granulator to operate smoothly. The granulated slag particle size control method can prevent reduction of conversion rate of glass bodies due to overlarge granulated slag particles, prevent wall adhesion of the granulated slag particles and low conversion rate of the glass bodies due to over-small granulated slag particles, control the particle size of the granulated particles of the liquid molten slag, and provide references for industrial application of the dry-type centrifugal granulation technology.

Description

Liquid slag dry centrifugal granulated slag particle size control method

Technical field

The invention relates to the technical field of high temperature liquid slag waste heat recovery, in particular to a liquid slag dry centrifugal granulated slag particle size control method.

Background technique

China is currently the world's largest steel producer. In 2016, China's pig iron production was about 701 million tons, accounting for about 60% of the world's total production. In the process of smelting pig iron, blast furnace slag containing huge heat was also produced. The blast furnace slag is generally discharged at a temperature between 1400 and 1550 ° C. Each ton of slag contains (1260 to 1880) × 10 ³ kJ of sensible heat, equivalent to 60 kg of standard coal. Under the existing ironmaking technology in China, for every ton of pig iron produced by the production of 0.3 tons of blast furnace slag, the current calculation of pig iron production in China is 701 million tons, which can be converted into blast furnace slag of about 210 million tons. About 12.618 million tons of standard coal.

The dry slag pit cooling method and the water slag slag method are the most common blast furnace slag treatment methods in China. The dry slag method produces a large amount of water vapor when it is cooled, and at the same time releases a large amount of H ₂ S and SO ₂ gas, corroding the building, destroying the equipment and deteriorating the working environment. The water slag method wastes a lot of water resources during the treatment process, generates harmful gases such as SO ₂ and H ₂ S, and cannot effectively recover high-quality waste heat resources contained in the high-temperature liquid slag. At present, these treatment methods can not meet the urgent needs of energy saving and emission reduction in the current steel industry, and the dry centrifugal granulation method is widely favored due to low system energy consumption, small and uniform particle size, and high added value of products.

In the dry centrifugal granulation process, the liquid slag drops onto the surface of the high-speed rotating granulator, and is scooped out under the action of centrifugal force and friction force to form small droplets under the action of surface tension. These tiny liquids The droplets are forced to convective heat transfer with a heat transfer medium (generally air) in the space, and radiative heat exchange with the surrounding environment causes the temperature of the small droplets to decrease, and then a phase change occurs to form a solidified layer. As the temperature is further reduced, the droplets gradually transform into solid small particles. However, if the particle size of the granulated slag is too large, the cooling rate of the molten slag particles is reduced during the heat exchange with the heat transfer medium in the space, and the crystal phase is easily changed, thereby causing a decrease in the glass transition rate and affecting the particles. The high-efficiency resource utilization of the slag particles; if the particle size of the granulated slag particles is too small, the flight distance is too long, and it is easy to hit the granulated warehouse wall surface in the molten state or the external condensed molten state to adhere thereto, and Easy to bond into large pieces. If the high-temperature slag particles are bonded to the wall surface and bonded into a large block, on the one hand, it is easy to cause over-temperature and corrosion of the granulated warehouse wall surface, and the large block that is bonded after cooling is not easy to clean, which brings the pole for maintenance work. On the other hand, the slag particles bonded into a large block are slowly cooled in the granulated space and have sufficient time to crystallize, thereby reducing the glass transition rate and affecting its efficient resource utilization. Therefore, in order to ensure the normal progress of dry centrifugal granulation, it is urgent to provide a liquid slag dry centrifugal granulated slag particle size control method.

Summary of the invention

The object of the present invention is to provide a liquid slag dry centrifugal granulated slag particle size control method to solve the above technical problem; the control method of the invention can effectively prevent the granulated slag particles from being excessively caused to cause a decrease in the vitreous conversion rate thereof. When the slag particles are too small, the granulated slag particles have a low wall and glass transition rate.

In order to achieve the above object, the technical solution adopted by the present invention is:

Liquid slag dry centrifugal granulated slag particle size control method based on a liquid slag dry centrifugal granulation system; the liquid slag dry centrifugal granulation system comprises temperature control unit, flow control unit and granulation Control unit

a temperature control unit for controlling the high temperature slag in the liquid melting buffer device to maintain the set temperature range, and controlling the outflow slag temperature of the buffer device to maintain the set temperature range;

a flow control unit for controlling the flow rate of the high-temperature slag flowing out of the buffer device in a set range to ensure the smoothness of the flow;

a granulator control unit for controlling the centering of the granulator center and the center of the slag tube of the buffer device, and ensuring smooth operation of the granulator during high-speed rotation;

The liquid slag dry centrifugal granulated slag particle size control method specifically comprises the following steps:

First, through the temperature control unit, flow control unit and granulator control unit, control the temperature and flow rate of the liquid slag falling into the granulator, and ensure that the granulator and the slag tube are centered and smooth without shaking; then enter the commissioning Through the process test, adjusting the granulator rotation speed, outflow flow rate, viscosity temperature characteristics, granulator structure, granulator size, granulator surface roughness, granulator edge wind speed and angle, to obtain granulated slag particles Particle size and granulator rotation speed, outflow flow rate, viscosity temperature characteristics, granulator structure, granulator size, granulator surface roughness, granulator edge wind speed and angle;

When the process test is used to obtain the granulated particle size and granulator rotation speed, the outflow flow rate, the viscosity temperature characteristic, the granulator structure, the granulator size, the granulator surface roughness, the granulator edge wind speed and the angle After the relationship, the normal granulation process begins;

If the particle size of the granulated slag obtained according to the above particle size relationship is larger than the set interval during the normal granulation process, the granule speed of the granulator is finely adjusted to return to the set interval; if the particle size of the granulated slag is smaller than the set The interval is adjusted to the set interval by fine-tuning the small granulator speed.

Further, the temperature control means of the temperature control unit includes: the cache device has a temperature control program, the cache device adopts a heat supplement method, the cache device has a temperature control program, and a heat supplement method is added.

Further, if the known viscosity-temperature characteristic of the slag cannot satisfy the requirement of controlling the particle size of the granulated slag, the particle size can be controlled by adjusting the alkalinity of the slag to adjust the viscosity-temperature characteristic of the slag.

Further, the liquid slag dry centrifugal granulation system comprises: a granulator, a granulator fixing device and a granulator driving device; the granulator is fixed on the granulator fixing device; the granulator fixing device is internally provided In the air flow channel, the granulator fixing device is arranged to contact the bottom of the granulator to provide an extended heating surface; the top of the granulator fixing device is provided with a plurality of first air outlets, and the outlet angle of the first first air outlet intersects the inclination angle of the granulator edge, The liquid film or the liquid filament formed during the granulation process is externally crushed; the granulator fixing device is provided with a plurality of second tuyères on the side, and the second tuyere is parallel or intersected with the inclination angle of the edge of the granulator for granulation The droplets formed by the liquid filament breakage during the process are cooled; the first tuyere and the second tuyere are in communication with the gas flow passage; the granulator drive is used to drive the granulator to rotate.

Further, the invention 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; and 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 inner sleeve of the air duct, a shaft sleeve and a rotating shaft; the sealing cover surrounds the outer circumference of the motor, and the sleeve and the shaft sleeve of the air duct are sleeved on the rotating shaft The outer circumference; the inner ring of the temperature-resistant thrust bearing and the temperature-resistant locating bearing are fixed on the rotating shaft, and the outer ring is fixed on the inner wall of the inner sleeve of the air duct; the outer sleeve of the shaft sleeve is fixed on the outer ring of the temperature-resistant bearing at the top thereof and the temperature-resistant bearing of the lower part thereof The temperature-resistant blades are surrounded by the outer ring; the temperature-resistant thrust bearing and the temperature-resistant locating bearing are provided with air flow passages; the sealing cover is fixedly connected with the inner sleeve of the air duct, and is connected through the vent; the inner sleeve of the air duct An outer sleeve of the air duct is arranged around the outer circumference of the cylinder, and an annular cooling air duct is formed between the inner sleeve of the air duct and the outer sleeve of the air duct, and a plurality of wind hoods are arranged annularly at the top of the annular cooling air duct; Cool the air duct inlet.

Further, the shaft cooling air enters from the air vent of the sealing cover, and after cooling the rotating shaft through the inside of the shaft sleeve, most of the air flow passages entering the granulator fixing device are uniformly distributed from the top of the granulator fixing device and the side walls. The first tuyere and the second tuyere enter the granulation chamber, and a small portion enters the granulation chamber from a narrow gap between the granulator fixture and the inner sleeve of the duct.

Further, the air outlet of the hood is lower than the air outlet of the first air outlet and the second air outlet.

Further, the bottom of the rotating shaft is provided with a temperature-resistant thrust bearing, and one or more temperature-resistant positioning bearings are arranged in the middle and the upper part of the rotating shaft, wherein the uppermost positioning bearing should be as close as possible to the bottom of the granulator fixing device.

Further, there are three ways to generate shaft cooling air:

In the first mode, the cooling air is generated by the fan, and enters from the air outlet of the sealing cover, most of which flows out through the air flow passage of the granulator fixing device, and a small portion flows out from the narrow gap between the fixing device and the inner sleeve of the air duct;

In the second mode, the temperature-resistant blades on the rotating shaft generate cooling air with the high-speed rotation of the rotating shaft, and most of the airflow passages passing through the granulator fixing device flow out, and a small portion flows out from a narrow gap between the fixing device and the inner sleeve of the air duct;

In the third mode, the fan air outlet and the high temperature rotating blade of the temperature resistant blade cooperate as the shaft cooling wind to cool the shaft cooling air duct and the rotating shaft.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The method for controlling the particle size of the dry granulated granulated slag of the liquid slag provided by the invention can effectively control the particle size of the granulated slag, avoiding the excessive conversion of the granulated slag particles, thereby reducing the conversion rate of the vitreous body and avoiding the granulated slag. The small size of the particles causes the viscous slag particles to adhere to the wall and the glass body has a low conversion rate, which provides a certain reference for industrial applications.

(2) The present invention proposes a structure for ensuring the air outlet at the edge of the granulator in the particle size control, wherein the granulator fixing device has a plurality of tuyères at the top thereof, and the outlet angle intersects the dip angle of the granulator edge. The liquid film or liquid filament formed during the granulation process can be externally broken to enhance the granulation effect.

(3) The present invention proposes a liquid slag dry centrifugal granulation system in particle size control, wherein the rotating shaft is provided with one-stage, two-stage or multi-stage small temperature-resistant blades. During the granulation process, the rotating shaft drives the temperature-resistant blade to rotate at a high speed. On the one hand, the flow power of the air duct is generated, the crushing effect of the granulated edge wind is enhanced, and the cooling of the shaft cooling device to the shaft and the granulator fixing device is accelerated. On the other hand, the temperature-resistant blade can also be used as a rib structure to enhance the overall heat dissipation of the rotating shaft.

DRAWINGS

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

1 is a flow chart of a method for controlling the particle size of a dry granulated granulated slag of liquid slag;

2 is a schematic view of a liquid slag dry centrifugal granulation system;

Figure 3 is a schematic view of the granulator fixture.

209-motor; 210-sealing cover; 211-coupling; 216-outer sleeve; 217-duct in duct; 219-granulator; 220-hood; 222-shaft sleeve; 223-shaft; 224-temperature resistant blade; 225-annular air vent; 226-vent; 227-sealed hood tuyere; 232-granulator fixture; 233-airflow runner; 234-expanded heating surface; 235-second tuyer; - The first air outlet.

Detailed ways

1 to 3, the liquid slag dry centrifugal granulated slag particle size control method of the present invention is based on a liquid slag dry centrifugal granulation system; the liquid slag dry centrifugal granule The system includes: a temperature control unit, a flow control unit, and a granulator control unit;

The temperature control unit is configured to control the high temperature slag in the buffer device to maintain the set temperature range, control the outflow slag temperature of the buffer device to maintain the set temperature range, and then control the viscosity value by the known viscosity temperature characteristic. There are many temperature control methods for the temperature control unit, such as the temperature control program of the cache device, the heat compensation means of the cache device, the temperature control program of the cache device, and the heating means.

The granulator control unit aligns the center of the granulator with the center of the slag tube of the buffer device, while ensuring smooth operation of the granulator during high-speed rotation.

The method for controlling the particle size of dry granulated granulated slag of liquid slag comprises the following steps:

First, through the temperature control unit, flow control unit and granulator control unit, control the temperature and flow rate of the liquid slag falling into the granulator, and ensure that the granulator and the slag tube are centered and smooth without shaking; then enter the commissioning Through the process test, adjusting the granulator rotation speed, outflow flow rate, viscosity temperature characteristics, granulator structure, granulator size, granulator surface roughness, granulator edge wind speed and angle, to obtain granulated slag particles The relationship between particle size and granulator rotation speed, outflow flow rate, viscosity temperature characteristics, granulator structure, granulator size, granulator surface roughness, granulator edge wind speed and angle.

When the process test is used to obtain the granulated particle size and granulator rotation speed, the outflow flow rate, the viscosity temperature characteristic, the granulator structure, the granulator size, the granulator surface roughness, the granulator edge wind speed and the angle After the relationship, the normal granulation process begins. If the particle size of the granulated slag obtained according to the above particle size relationship is larger than the set interval, the granulating speed of the granulator is finely adjusted to return to the set interval; if the particle size of the granulated slag is smaller than the set interval, fine granulation is finely adjusted. The speed of the device is returned to the set interval.

If the known viscosity-temperature characteristics of the slag cannot meet the requirements for controlling the particle size of the granulated slag, the particle size can be controlled by adjusting the alkalinity of the slag and adjusting the viscosity-temperature characteristics of the slag.

The invention provides a liquid slag dry centrifugal granulated slag particle size control method, the particle size control method is applicable to a plurality of liquid slag dry centrifugal granulation systems, and a method is proposed herein;

The liquid slag dry centrifugal granulation system comprises: a granulator 219, a granulator fixing device 232 and a granulator driving device; the granulator 219 has a disk shape or a cup shape, and the edge inclination angle is 30° to 60°, the center A flow guiding cone is provided; the granulator 219 is fixed on the granulator fixing device 232; the granulator fixing device 232 is internally provided with an air flow passage 233; and the granulator fixing device 232 is connected to the bottom of the granulator 219 to provide extended heat. The surface 234, such as an annular rib, can better cool the granulator fixture; the granulator fixture 232 has a plurality of first tuyères 236 at the top, and the outlet angle of the first tuyere and the edge of the granulator When intersected, the liquid film or liquid filament formed during the granulation process can be externally broken to enhance the granulation effect; the granulator fixing device 232 is provided with a plurality of second tuyères 235 on the side, and the second tuyere and the edge of the granulator are inclined Parallel or cross, the droplets formed by the liquid filament breakage during granulation can be cooled to increase the glass transition rate. The first tuyere 236 and the second tuyere 235 are in communication with the air flow passage 233.

The granulator driving device includes a motor 209, a sealing cover 210, a rotating shaft 223, a shaft sleeve 222, an inner tube sleeve 217, an outer tube sleeve 216, a hood 220, and the like. The motor 209 and the rotating shaft 223 are coupled by a coupling 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, and one or more temperature-resistant positioning bearings 221 are provided at the middle and the upper portion of the rotating shaft. The uppermost positioning bearing should be as close as possible to the bottom of the granulator fixing device 232. On the one hand, the rotating shaft of the high-speed rotating shaft can be improved due to the inaccurate mechanical structure, thereby affecting the granulation effect, and on the other hand, the life of the device can be prolonged.

The shaft cooling air duct includes a motor seal cover 210, an air duct inner sleeve 217, a shaft sleeve 222, and a rotating shaft 223. The sealing cover 210 surrounds the outer circumference of the motor 209, and the inner sleeve 217 and the shaft sleeve 222 are sleeved on the outer circumference of the rotating shaft 223; the inner rings of the temperature-resistant thrust bearing 212 and the temperature-resistant positioning bearing 221 are fixed on the rotating shaft 223, and the outer ring Fixed to the inner wall of the inner sleeve 217 of the air duct; the shaft sleeve 222 is fixed between the outer ring of the upper temperature-resistant bearing and the outer ring of the lower temperature-resistant bearing thereof, and the temperature-resistant blade 224 is surrounded therein; the temperature-resistant thrust bearing 212 and The air temperature locating bearing 221 is provided with a supply air flow path 218. A granulator fixing device 232 is fixed to the top of the rotating shaft 223.

The sealing cover 210 is fixedly connected to the inner tube sleeve 217, communicates through the vent 226, and the shaft cooling air enters from the sealing cover tuyere 227. After cooling the rotating shaft 223 through the inside of the shaft sleeve 222, most of it enters the granulator fixing device 232. The air flow passage 233 enters the granulation chamber from the plurality of first tuyere 236 and the second tuyere 235 which are annularly distributed from the top and the side wall of the granulator fixing device 232, and a small portion from the granulator fixing device 232 and the inner tube sleeve 217 A narrow gap enters the granulation bin. An outer tube sleeve 216 is disposed on the outer circumference of the inner tube sleeve 217, and an annular cooling air passage is formed between the inner tube sleeve 217 and the outer tube sleeve 216. The top of the annular cooling air channel is annularly arranged with a plurality of hoods 220, and the hood 220 The air outlet is lower than the air outlets of the first tuyere 236 and the second tuyere 235. An annular cooling air duct air inlet 225 is opened at the bottom of the outer tube sleeve 216.

In the present invention, the granulator fixing device 232 is composed of two parts, left and right, and is fixed by a pin and a hoop. When the granulator 219 is damaged, the pin is removed, the granulator 219 and the granulator fixing device 232 can be removed, the pin and the hoop can be removed, and the left and right parts of the granulator fixing device 232 can be disassembled and removed. The granulator 219 can be removed after the annular clamp. When the granulator 219 is cracked, the cracked granulator 219 is not smashed due to the presence of the granulator base and the fixture, and the liquid slag does not drip directly onto the transmission and the motor 209. Ensure system safety before downtime. At the same time, it is only necessary to replace the granulator 219, which reduces the cost of replacing the entire granulator by the general granulator 219 due to damage. The granulator fixing device 232 is internally provided with a streamlined flow passage 233; at the same time, the gap between the bottom side of the granulator base and the inner sleeve 217 of the air duct is small, so that most of the wind sent from the lower portion of the granulator base can enter. To the streamlined flow passage 233, the granulator fixture 232 is cooled while facilitating the blowing of wind from the granulator base to the edge of the granulator 219 to enhance granulation.

In the present invention, the rotating shaft 223 and the granulator fixing device 232 are connected by a hollow flange, and the hollow flange has a section of air heat insulating layer between the granulator base and the rotating shaft 223 to block the granulator 219 and the rotating shaft 223. The heat transfer between the granulator base is not transmitted to the rotating shaft 223, so that the granulator 219 can be safely and stably operated, and the granulation effect can be better realized.

There are three ways to generate the shaft cooling air: mode one, the cooling air is generated by the fan, entering from the sealing hood tuyere 227, most of the annular air duct passing through the granulator fixing device enters the granulation chamber, and a small part is from the fixing device and the air duct inner sleeve. The narrow gap between the cylinders 217 enters the granulation chamber; in the second embodiment, the first and second or multi-stage small temperature-resistant blades 224 are arranged on the rotating shaft 223, and the cooling wind is generated by the high-speed rotation of the rotating shaft, and most of them are fixed by the granulator. The annular duct of unit 232 enters the granulation chamber and a small portion enters the granulation chamber from a narrow gap between the fixture and the inner sleeve 217 of the duct. The rotating shaft 223 is provided with one-stage, two-stage or multi-stage small temperature-resistant blades 224. When the rotating shaft 223 rotates at a high speed, on the one hand, the flow power of the shaft cooling air passage is generated, and the acceleration shaft cooling air shaft and the granulator fixing device are generated. Cooling, on the other hand, the temperature-resistant blade 224 can also be used as a rib structure to enhance the overall heat dissipation of the rotating shaft 223; in the third mode, the wind blower and the small temperature-resistant blade are combined with the high-speed rotating wind as the shaft cooling wind, and the shaft cooling wind Cooling of components such as the track and the shaft. It should be noted that the above embodiments are merely illustrative of the present invention and are not intended to limit the technical solutions described in the present invention; therefore, although the present specification has been described in detail with reference to the various embodiments described above, It will be understood by those skilled in the art that the present invention may be modified or equivalently substituted without departing from the spirit and scope of the invention.

Claims

Liquid slag dry centrifugal granulated slag particle size control method, characterized in that it is based on a liquid slag dry centrifugal granulation system; the liquid slag dry centrifugal granulation system comprises temperature control unit, flow control Unit and granulator control unit;

a temperature control unit for controlling the high temperature slag in the liquid slag buffer device to maintain the set temperature range, and controlling the outflow slag temperature of the buffer device to maintain the set temperature range;

a flow control unit for controlling the flow rate of the high-temperature slag flowing out of the buffer device in a set range to ensure the smoothness of the flow;

a granulator control unit for controlling the centering of the granulator center and the center of the slag tube of the buffer device, and ensuring smooth operation of the granulator during high-speed rotation;

The liquid slag dry centrifugal granulated slag particle size control method specifically comprises the following steps:

First, through the temperature control unit, flow control unit and granulator control unit, control the temperature and flow rate of the liquid slag falling into the granulator, and ensure that the granulator and the slag tube are centered and smooth without shaking; then enter the commissioning Through the process test, adjusting the granulator rotation speed, outflow flow rate, viscosity temperature characteristics, granulator structure, granulator size, granulator surface roughness, granulator edge wind speed and angle, to obtain granulated slag particles Particle size and granulator rotation speed, outflow flow rate, viscosity temperature characteristics, granulator structure, granulator size, granulator surface roughness, granulator edge wind speed and angle;

When the process test is used to obtain the granulated particle size and granulator rotation speed, the outflow flow rate, the viscosity temperature characteristic, the granulator structure, the granulator size, the granulator surface roughness, the granulator edge wind speed and the angle After the relationship, the normal granulation process begins;

If the particle size of the granulated slag obtained according to the above particle size relationship is larger than the set interval during the normal granulation process, the granule speed of the granulator is finely adjusted to return to the set interval; if the particle size of the granulated slag is smaller than the set The interval is adjusted to the set interval by fine-tuning the small granulator speed.
The liquid slag dry centrifugal granulated slag particle size control method according to claim 1, wherein the temperature control unit comprises: the cache device has a temperature control program, and the cache device uses a heat compensation method. The cache device comes with a temperature control program and adds heat compensation.
The liquid slag dry centrifugal granulated slag particle size control method according to claim 1, wherein if the known viscosity-temperature characteristic of the slag cannot satisfy the requirement of controlling the particle size of the granulated slag, the melting is regulated. The alkalinity of the slag further adjusts the viscosity-temperature characteristics of the slag, thereby achieving control of the particle size.
The liquid slag dry centrifugal granulated particle size control method according to claim 1, wherein the liquid slag dry centrifugal granulation system comprises: a granulator (219) and a granulator a fixing device (232) and a granulator driving device; the granulator is fixed on the granulator fixing device (232); the granulator fixing device is internally provided with an air flow passage (233), and the granulator fixing device contacts the granulator The bottom of the granulator fixture is provided with a plurality of first tuyères (236), and the outlet angle of the top first tuyere intersects the dip angle of the edge of the granulator for granulation The formed liquid film or liquid filament is subjected to external force crushing; a plurality of second tuyères (235) are arranged on the side of the granulator fixing device (232), and the second tuyere is parallel or intersected with the inclination angle of the edge of the granulator for granulation The droplets formed by the breakage of the liquid filament are cooled during the process; the first tuyere and the second tuyere are in communication with the gas flow passage (233); the granulator drive is used to drive the granulator to rotate.
The liquid slag dry centrifugal granulation particle size control method according to claim 4, wherein the liquid slag dry centrifugal granulation system further comprises a granulator driving device and a shaft cooling air passage;

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 disposed on the rotating shaft;

The shaft cooling air duct includes a motor sealing cover (210), an inner tube sleeve (217), a shaft sleeve (222) and a rotating shaft (223); the sealing cover (210) surrounds the outer circumference of the motor (209), and the inner tube of the air duct ( 217) and the shaft sleeve (222) is sleeved on the outer circumference of the rotating shaft (223); the inner ring of the temperature resistant thrust bearing (212) and the temperature resistant positioning bearing (221) are fixed on the rotating shaft (223), and the outer ring is fixed at The inner wall of the inner sleeve (217); the shaft sleeve (222) is fixed between the outer ring of the temperature-resistant bearing at the top thereof and the outer ring of the temperature-resistant bearing at the lower portion thereof, and the temperature-resistant blade (224) is surrounded therein; Both the temperature thrust bearing (212) and the temperature resistant positioning bearing (221) are provided with an air flow passage (218);

The sealing cover (210) is fixedly connected with the inner tube sleeve (217) and communicated through the vent (226);

An outer sleeve (216) is arranged on the outer circumference of the inner sleeve (217) of the air duct, and an annular cooling air duct is formed between the inner sleeve (217) of the air duct and the outer sleeve (216) of the air duct, and the annular cooling duct is arranged at the top of the annular shape. There are a number of hoods (220); the bottom of the outer sleeve of the duct is provided with an annular cooling duct air inlet (225).
The liquid slag dry centrifugal granulated slag particle size control method according to claim 4, wherein the shaft cooling air enters from the sealing hood tuyere, and after the shaft sleeve is cooled to the rotating shaft, most of the granulation is entered. The air flow passage of the fixture is inserted into the granulation chamber from a plurality of first air outlets and second air outlets uniformly distributed on the top and side walls of the granulator fixture, and a small portion is between the granulator fixture and the inner sleeve of the air duct A narrow gap enters the granulation bin.
The liquid slag dry centrifugal granulated slag particle size control method according to claim 4, wherein the air outlet of the hood is lower than the air outlets of the first tuyere and the second tuyere.
The liquid slag dry centrifugal granulated slag particle size control method according to claim 4, wherein the bottom of the rotating shaft (223) is provided with a temperature-resistant thrust bearing (212), and one or more of the central and upper portions of the rotating shaft are provided. A temperature-resistant positioning bearing (221), wherein the uppermost positioning bearing should be as close as possible to the bottom of the granulator fixture.
The method according to claim 4, wherein the shaft cooling air has three production modes:

In the first mode, the cooling air is generated by the fan, entering from the sealing hood tuyere (227), and most of the airflow passage (233) passing through the granulator fixing device flows out, and a small portion is between the fixing device and the inner tube sleeve (217). a small gap flows out;

In the second mode, the temperature-resistant blade (224) on the rotating shaft (223) generates cooling air according to the high-speed rotation of the rotating shaft, and most of the airflow passage (233) flows out through the granulator fixing device (232), and a small portion is fixed from the fixing device. a narrow gap between the inner sleeve (217) of the air duct;

In the third mode, the fan air outlet and the high temperature rotating blade of the temperature resistant blade cooperate as the shaft cooling wind to cool the shaft cooling air duct and the rotating shaft.