Method for controlling particle size of dry centrifugal granulated slag particles from liquid slag

Abstract

A method for controlling a particle size of dry centrifugal granulated slag from liquid slag, which is based on a dry centrifugal granulation system for liquid slag, wherein the dry centrifugal granulation system for the liquid slag includes: a temperature control unit, a flow control unit, and a granulator control unit; wherein the temperature control unit is configured to control a high-temperature slag in the liquid slag buffer device to maintain a first set temperature range, and control a temperature of an outflow slag of the buffer device to maintain a second set temperature range; a flow control unit configured to control a flow rate of the high-temperature slag flowing out of the buffer device in a set range to ensure smoothness of the flow; a granulator control unit configured to ensure a smooth operation of the granulator during high-speed rotation.

What is claimed is: 
     
         1 . A method for controlling a particle size of dry centrifugal granulated slag from liquid slag, which is based on a dry centrifugal granulation system for liquid slag, wherein the dry centrifugal granulation system for the liquid slag comprises: a temperature control unit, a flow control unit, and a granulator control unit;
 wherein the temperature control unit is configured to control a high-temperature slag in the liquid slag buffer device to maintain a first set temperature range, and control a temperature of an outflow slag of the buffer device to maintain a second set temperature range;   a flow control unit configured to control a flow rate of the high-temperature slag flowing out of the buffer device in a set range to ensure smoothness of the flow;   a granulator control unit configured to control centering of a center of the granulator and a center of a slag tube of the buffer device, and meanwhile ensuring a smooth operation of the granulator during high-speed rotation;   the method for controlling a particle size of dry centrifugal granulated slag from liquid slag specifically comprises steps of:   step (1) through the temperature control unit, the flow control unit and the granulator control unit, controlling a temperature and a flow rate of a liquid slag falling into the granulator, and ensuring that the granulator and the slag tube are centered and smooth without shaking; then commissioning; through a process test, adjusting a rotation speed of the granulator, an outflow flow rate, a viscosity temperature characteristic, a granulator structure, a granulator size, a granulator surface roughness, a granulator edge wind speed and angle, so as to obtain relationships between a particle size of the granulated slag and the rotation speed of the granulator, the outflow flow rate, the viscosity temperature characteristic, the granulator structure, the granulator size, the granulator surface roughness, and the granulator edge wind speed and angle;   starting a normal granulation process after the relationships between the particle size of granulated slag and the rotation speed of the granulator, the outflow flow rate, the viscosity temperature characteristic, the granulator structure, the granulator size, the granulator surface roughness, and the granulator edge wind speed and angle are obtained;   if the particle size of the granulated slag obtained according to the relationship of the particle size is larger than a set interval during the normal granulation process, increasing a granule speed of the granulator to return to the set interval; if the particle size of the granulated slag is smaller than the set interval, decreasing the granule speed of the granulator to return to the set interval.   
     
     
         2 . The method for controlling a particle size of dry centrifugal granulated slag from liquid slag, as recited in  claim 1 , wherein a temperature control means of the temperature control unit comprises: providing a temperature control program on the cache device, providing a heat supplement solution on the cache device, providing the temperature control program on the cache device and adding a heat supplement solution. 
     
     
         3 . The method for controlling a particle size of dry centrifugal granulated slag from liquid slag, as recited in  claim 1 , wherein if the viscosity-temperature characteristics of the slag known are not capable of meeting the requirements for controlling the particle size of the granulated slag, the particle size is controlled by adjusting the alkalinity of the slag to adjust the viscosity-temperature characteristics of the slag. 
     
     
         4 . The method for controlling a particle size of dry centrifugal granulated slag from liquid slag, as recited in  claim 1 , wherein the dry centrifugal granulation system for the liquid slag comprises: a granulator ( 219 ), a granulator fixing device ( 232 ) and a granulator driving device; wherein the granulator is fixed on the granulator fixing device ( 232 ); and the granulator fixing device is provided with an air flow channel ( 233 ), the granulator fixture contacts a bottom of the granulator to provide an expanded heat receiving surface ( 234 ); the top of the granulator fixture has a plurality of first tuyeres ( 236 ), and the outlet angle of the top first tuyere and the edge of the granulator The dip angle intersects to externally crush the liquid film or liquid filament formed during the granulation process; the granulator fixing device ( 232 ) has a plurality of second tuyères ( 235 ) on the side, and the second tuyere and the edge of the granulator are inclined The angles are parallel or intersected for cooling droplets formed by liquid filament breakage during granulation; 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. 
     
     
         5 . The method for controlling a particle size of dry centrifugal granulated slag from liquid slag, as recited in  claim 4 , wherein the liquid slag dry centrifugal granulation system further includes a granulator drive device and a shaft cooling air passage;
 wherein 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 comprises 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 ).   
     
     
         6 . The method for controlling a particle size of dry centrifugal granulated slag from liquid slag, as recited in  claim 4 , wherein the shaft cooling air enters from the sealing hood tuy, and after cooling the rotating shaft inside the shaft sleeve, most of the air flow passages entering the granulator fixing device, and a plurality of first air outlets uniformly distributed from the top and the side wall of the granulator fixing device And the second tuyere enters 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. 
     
     
         7 . The method for controlling a particle size of dry centrifugal granulated slag from liquid slag, as recited in  claim 4 , wherein the air outlet of the hood is lower than the air outlet of the first air outlet and the second air outlet 
     
     
         8 . The method for controlling a particle size of dry centrifugal granulated slag from liquid slag, as recited in  claim 4 , wherein 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 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. 
     
     
         9 . The method for controlling a particle size of dry centrifugal granulated slag from liquid slag, as recited in  claim 4 , wherein there are three ways to generate shaft cooling air:
 (1) 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;   (2) 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;   (3) 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.