US 11,892,236 B2
System for conditioning stucco in a dust collector
Michael M. Chen, Naperville, IL (US)
Assigned to Schenck Process LLC, Kansas City, MO (US)
Filed by Schenck Process LLC, Kansas City, MO (US)
Filed on Sep. 30, 2020, as Appl. No. 17/038,910.
Prior Publication US 2022/0099372 A1, Mar. 31, 2022
Int. Cl. F27B 1/00 (2006.01); B01J 6/00 (2006.01); B01D 46/02 (2006.01); B01D 46/48 (2006.01); C04B 11/036 (2006.01); F27B 1/08 (2006.01); F27B 1/21 (2006.01); F27B 1/26 (2006.01); F27B 1/28 (2006.01); F27D 1/00 (2006.01); F27D 3/08 (2006.01); F27D 15/02 (2006.01); F27D 3/00 (2006.01); F27D 19/00 (2006.01)
CPC F27B 1/005 (2013.01) [B01D 46/023 (2013.01); B01D 46/48 (2013.01); B01J 6/004 (2013.01); C04B 11/036 (2013.01); F27B 1/08 (2013.01); F27B 1/21 (2013.01); F27B 1/26 (2013.01); F27B 1/28 (2013.01); F27D 1/0003 (2013.01); F27D 3/08 (2013.01); F27D 15/02 (2013.01); F27D 2003/0038 (2013.01); F27D 2003/0046 (2013.01); F27D 2003/0083 (2013.01); F27D 2019/0071 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A system for conditioning stucco particulate material, the system comprising:
a single vessel having separation chamber and a holding chamber, both being located in the vessel, the separation chamber being in direct communication with the holding chamber;
stucco particulate material entrained in hot air, the stucco particulate material having residual gypsum and over calcined stucco therein;
the separation chamber having an inlet configured for supplying the stucco particulate material entrained in the hot air, the separation chamber having a collector system configured for separating the stucco particulate material from the hot air, the separation chamber having a hot air outlet for discharging the hot air from the separation chamber, the collector system having a discharge capacity for discharging the stucco particulate material from the separation chamber and into the holding chamber;
the holding chamber defining a holding volume therein and the holding chamber having a stucco outlet and a conveyor screw disposed between the holding volume and the stucco outlet, the conveyor screw configured for conveying the stucco particulate material through the stucco outlet and for mixing and mitigating bridging of the stucco particulate material in the holding chamber; and:
(a) the holding volume is of a predetermined magnitude configured to achieve a residence time of 20 to 30 minutes of the stucco particulate material in the holding chamber to thereby condition the stucco particulate material in the holding chamber, before discharging the stucco particulate material through the stucco outlet, wherein the conditioning comprises calcining the residual gypsum into calcium sulfate hemihydrate and transforming the over calcined stucco into calcium sulfate hemihydrate; and
(b) a control unit in communication with a drive unit connected to the conveyor screw, a sensor in communication with the holding chamber and the control unit, the sensor being a level sensor or level switch and configured to generate control signals at a setpoint, the control signals being indicative of a level of stucco particulate material in the holding chamber and to transmit the control signals to the control unit, the control unit being configured to control the drive unit based upon the control signals, to accumulate and retain the stucco particulate material in the holding chamber, the control unit being configured to achieve the residence time of 20 to 30 minutes of the stucco particulate material in the holding chamber before discharging the stucco particulate material through the stucco outlet.