Patent GB-1003426-A (GB)
Title: Improvements in gas-solid material separators
IPC: B01D46/04
Filed: 1962-08-09
Abstract: 1,003,426. Separating solid material from gases. FULLER CO. Aug. 9, 1962 [Nov. 14, 1961], No. 30578/62. Heading B1T.  A separator for separating solid material from gases comprises an upright cylindrical concrete casing 1, Fig. 1, subidivided by a cylindrical concrete partition 2 and a plurality of radial concrete partitions 3 into a plurality of filter compartments 5 surrounding a supply compartment 4. The supply compartment 4 receives gases, e.g. from a cement kiln, through a duct 7, Fig. 2, leading from a fan 8, and the compartment 4 communicates with the filter compartments 5 through ports 17 under the control of valves 18. Each compartment 5 is provided with outward flow filter bags 38 extending from a crown sheet 33 from which also extends a stack 35 upwardly open to the atmosphere. The upper end of the supply compartment 4 is closed by a conical deflector 11 to provide a reverse-flow air chamber 12 which communicates with the intake 9 of the fan 8 through a duct 15 and with the filter compartments 5 through ports 19 under the control of valves 20. The valves 18 and 20 and discharge valves 42 provided at the bottom of hoppers 41 closing the lower ends of the filter compartments 5, are preferably actuated pneumatically or hydraulically. The valves 42 open into a common collecting hopper 45 provided with an air lock, such as a rotary feeder 47, leading to a screw conveyer 46. The filter compartments 5 are provided with horns 51 and 51a to provide sound waves for shaking the bags 38 ; the horns may be replaced by whistles or other bag vibrators or shakers. The casing 1 has an access door 52 leading to a service platform 53 for each compartment 5, the doors 52 being served by stairways 55 and walkways 54. In operation the valves 18 and 42 are open during filtration while the valves 20 are closed. At time intervals, e.g. dictated by the rate of material build-up on the filter bags, the valves 18 and 42 of one of the compartments 5 are closed and the associated valve 20 is opened allowing reverse-flow air cleaning of the bags in that compartment. At the same time the associated horns 51 and 51a are sounded to shake the bags. The bags in the other filter compartments 5 are cleaned in a similar manner at suitable time intervals. In a second embodiment, Fig. 5, a suction fan 8<SP>1</SP> is carried by the roof of the casing 1<SP>1</SP> and formed below the roof is a space sub-divided by two cylindrical walls 64 and 65 into an inner exhaust chamber 66, which communicates with the inlet of the fan 8<SP>1</SP>, an outer reverse-flow air chamber 68, which communicates with the outlet of a reverse-flow air fan 75, and an intermediate chamber 67 itself subdivided into chambers 69, Fig. 6 (not shown) by partitions 70, Fig. 6 (not shown), corresponding to the partitions 3. The fan 75 draws clean gas through a duct 76 from the outlet of the fan 8<SP>1</SP>. Each filter chamber 5<SP>1</SP> communicates by means of a stack 35<SP>1</SP> with one of the chambers 69 which has ports 71 and 72 controlled by valves 73 and 74 and communicating with the chambers 66 and 68, respectively. The hoppers 41<SP>1</SP> at the bottoms of the filter chambers 5 open by way of valves 42<SP>1</SP> into surge hoppers 77 which communicate with screw conveyers 78 and 46<SP>1</SP>, and the lower end of the supply compartment 4<SP>1</SP> terminates in a hopper 81 having a valved outlet 82 leading to the screw conveyer 46<SP>1</SP>. A spray nozzle 83 is provided at the upper end of the supply compartment 4<SP>1</SP> for spraying the gas with a vaporizing substance such as water. When the filter bags of one of the compartments 5<SP>1</SP> have to be cleaned by reverse flow of air the associated valves 73 and 42<SP>1</SP> are closed and the associated valve 74 is opened. The supply compartment 4 or 4<SP>1</SP> may be provided at the side of the casing 1 or 1<SP>1</SP> instead of in the middle thereof. The filter bags are preferably formed of glass fabric. Specification 936,487 is referred to.