Control system and method for dry centrifugal granulation of liquid slag

A control system for dry centrifugal granulation of liquid slag, comprising a granulator cold-air control unit and a feeding unit, wherein:

• the granulator cold-air control unit comprises a granulator (14), a rotating shaft (16), a motor (1) and a cold-air supply unit;
• a bottom of the granulator (14) is fixed to the motor (1) arranged vertically through the rotating shaft (16);
• a second temperature measurement component (17), for monitoring a temperature of the rotating shaft, is arranged on the rotating shaft (16);
• the motor (1) is sealed through a sealing cover (2);
• an air vent (23) is provided on the sealing cover (2);
• a shaft sleeve (15) is sleeved at periphery of the rotating shaft (16);
• an inner duct sleeve (7) is fixed on the sealing cover (2);
• the inner duct sleeve (7) is arranged at periphery of the shaft sleeve (15);
• the shaft sleeve (15) is supported within the inner duct sleeve (7) through a bearing (24) with an air vent;
• a top of the sealing cover (2) is intercommunicated with the inner duct sleeve (7);
• and, cooling air vents (21) are annularly and symmetrically provided on the shaft sleeve (15);
• the cold-air supply unit comprises a shaft cooling air channel and an annular cooling air channel;
• a master control valve (19) is arranged on a cold-air main (27);
• an exit of the master control valve is divided into a shaft cooling air branch (28) and an annular cooling air branch (26);
• a control valve (18) for the annular cooling air branch is arranged on the annular cooling air branch (26);
• a flowmeter (22) is arranged on the shaft cooling air branch (28);
• the shaft cooling air channel consists of the inner duct sleeve (7) and the shaft sleeve (15);
• the annular cooling air channel consists of the inner duct sleeve (7) and an outer duct sleeve (8) arranged at periphery of the inner duct sleeve (7), which have different external diameters;
• an air intake (20) is provided at a bottom of the outer duct sleeve (8), and an air cap (9) is arranged at a top of the outer duct sleeve;
• the shaft cooling air branch (28) is connected to the air vent (23) at a bottom of the sealing cover (2);
• and, the annular cooling air branch (26) is connected to the air intake (20) at the bottom of the outer duct sleeve (8);
• and
• the feeding unit comprises a slag dropping pipe (11) which is arranged above the granulator (14);
• the slag dropping pipe (11) is divided into an upper section and a lower section;
• a diameter of the upper section is larger than a diameter of the lower section;
• a sliding gate (12) is arranged at the lower section, and an accident diversion spout (13) is equipped;
• and, a first temperature measurement component (10), for monitoring a temperature of the liquid slag in the slag dropping pipe (11), is arranged in the slag dropping pipe (11).