NEW PRODUCTS Equipment
“OG” Gas Recovery Equipment A highly efficient gas and fume collecting system, developed in Japan by Yawata Iron & Steel Co. and Yokoyama Engineering Co., has been acquired by Chemical Construction Corp. T h e process, which will be offered by Chemico’s Pollution Control Division, should enable American mills to reduce the cost of steel production. T h e noncombustion technique for recovering the CO gas from oxygen furnaces has undergone several improvements to make the equipment more compact, more efficient, and lower in cost. T h e new hardware is quite compact. T h e main items of equipment are a hood, gas cooler, dust collectors, and a gas duct with induced draft fan. T h e lower end of the hood has a movable skirt which can nearly close the gap between converter mouth and hood, thereby preventing gas combustion inside and gas leakage to the exterior. T h e tubular cooler can reduce gas temperature to 1290” F. T h e dust collectors are of the two-stage type. T h e first is a low-velocity venturi-type quencher and the second is a P-A venturi equipped with a movable throat. Elbow separators for mist separation are placed after each dust collector. T h e performance of the furnace is influenced by the shape of the hood for the gas recovery system, requiring care in hood design. T h e movable skirt at the bottom of the hood can be elevated u p to 27.6 inches by hydraulic cylinders. During blowing, the skirt is lowered until it touches the converter mouth maintaining a practically closed vessel. Since the skirt has a wider diameter at the bottom, there is no danger of “freezing” the skirt to the converter mouth because of metal spilled during blowing. T h e skirtlifting stroke is large enough to avoid interference with tilting the vessel.
Inside diameter of the hood is sufficiently large for the converter mouth and is jacketed to prevent problems from metal or slag adherence in the seal portion between skirt and hood. T h e most appealing feature of the OG process is increased yield from the converter. T h e steel making yield is at least 1.5% higher than with conventional gas recovery systems. This is caused by the prevention of metal or slag from spilling out of the vessel by maintaining the gap between converter mouth and hood practically closed. At the present time the recovered gas is being used for such applications as boiler fuel, rotary kiln fuel for pellet firing, and as fuel for the soaking pit. In the future, use of recovered gas as a raw material for synthetic chemical industries is expected. T h e gas temperature is difficult to measure at the inlet of the hood because of radiation from the furnace and the cooling effect of the wall. However, as calculated from calorific values, the peak temperature is approximately 2640” F. At the outlet of the gas cooler it is about 1290“ F. maximum. T h e gas is saturated by cooling with dust-
collecting water sprayed at the quencher and is further cooled at the P-A venturi. When cooled, the gas temperature is below 158’ F. because of the increase in volume of saturated vapor. This is due to low static pressure before the induced draft fan, radiation from dust collectors, and the exterior wall of the gas duct, plus heat drawn off by the dust-collecting water. Because the CO-rich gas generated during blowing is collected in an unburned state, the amount of gas to be treated is much less than would otherwise require treating. This allows for a more compact design of the recovery system. T h e first plant to use the sytsem was Yawata’s Tobata No. 2. From the continued development of the system over a period of four years the second unit was installed in Yawata’s Sakai BOF plant which is not only quite compact, but is rated to be superior in operational performance, dust-collecting efficiency, and safety. T h e Sakai plant is designed for a heat size of 193 tons, pig ratio of 80%, blowing time of 20 minutes, and an oxygen flow rate of 15,500 standard cu. ft. per minute. Chemical Construction Corp. 20 1 r?-
Burner
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mico Venturi
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EQUIPMENT PERISTALTIC PUMP
Model JB209 utilizes the concept of a set of three rotating rollers exerting a peristaltic or squeezing action on a resilient tube. T h e fluid, slurry, or powder is moved ahead by positive displacement and, as the tube recovers, a suction is created, filling the tube for the next roller. T h e unit has a capacity range of 5 to 300 GPH and may be used to pump gases, acids, abrasives, and sterile solutions. Amtec Products co. 202 PRECISION POWDER FEEDER
T h e unit feeds up to 10 lb./hr. of particles in the 10 to 1000 micron range and up to 2 lb./hr. of particles in the submicron range. T h e unit uses a small amount of carrier gas to move the powder to the work area. T h e feeder may be used for feeding powders into crystal growers, flame spray apparatus, spheroidizing units, and chemical reactors. Humphreys Corp. 203 LUBRICATOR
A motorized, constant-feed unit that accuratel) meters one, two, three, or four drops of oil per minute is available. A 115-volt synchronous motor drives a disk which picks up a predetermined number of drops of oil from the reservoir on each re\olution. T h e metered amount of oil is delivered through two tubes to the locations requiring lubrication. A 1-qt. oil reservoir eliminates need for frequent refilling and shutdown for hand oiling. Gast Mfg. Corp. 204 SCREW CONVEYOR CENTRIFUGE
A continuous process unit is available in 7-in. and 12-in. basket diameters for separation of crystalline. powdery, and short-fibrous materials. It provides efficient liquid-solid separation with minimum retention time. T h e unit operates at forces u p to 1800 G's and is recommended for use with products requiring minimum rinsing. Komline-Sanderson Engineering Corp. 205
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SLURRY VALVE
T h e valve, designed to handle all types of slurries, is available in sizes up to 6 in. T h e valve works easily against materials such as dusts, granules, small solids, and pulps, either wet, dry, or with binders. A charnher that is open to the upstream pipeline provides room for the slurry material to recirculate within the valve body. Purge holes are also provided. Everlasting Valve Go. 206 WATER STILL
Ultrapure water still is constructed of stainless steel and operates undei low pressure to provide efficient and economical high purity distilled water. T h e unit opcrates effectively with an untreated water feed, is resistant to cleaning acids, and is a pressure discharge system. Units are available in 5 , lo-, 20-, and 30-gal.-per-hr. capacities. American Sterilizer Co. 207 AUTOCLAVES
Magnetically actuated MagneDrive packless agitated pressure vessels are available with capacities of 50, 100, and 250 gal. T h e drive shaft is completely sealed within the unit, thus eliminating the stuffing box and packing required with packed autoclaves. T h e assembly operates at a working pressure of 3000 p.s.i. Autoclave Engineers, Inc. 208 DRUM WARMER
Model C R I units are available for use with either heating or cooling applications. They are designed for use in applications which require fast warming of substances for pumping. T h e unit has flow channels for steam, oil, and water brine or refrigerant for the heat transfer media. Dean Products, Inc. 209 VACUUM LEAF FILTER
Filters consist of open tanks filled with polypropylene plastic filter leaves through which water is drawn by a specially equipped centrifugal pump. T h e filter operation is observable in the open tank. Filter sizes are available in 135 to 1500 gal.-per-min. capacities per unit. Hayward Filter Co. 210
INDUSTRIAL A N D ENGINEERING CHEMISTRY
LITERATURE
Biological Shakers. T h e 8-page brochure features shakers for agitating microbial cultures ranging i n size from bench-top models to three-tier industrial models. Speed ranges, length of stroke, capacity, and operating features are given for each model. New Brunswick Scientific Co. Inc. 211 Needle Valve. Technical bulletin No. DS-8531 describes a diaphragm-operated needle valve that provides precise control of very low flows of liquids and gases. Included is information o n materials of construction, connection f i t tings, pressure range, pressure rating, sizing formulas, dimerisions, connections, and ordering information. Emerson Electric Co. 212 Watertube Boilers. A n 8-page brochure covering the AIodcl 3 series of commercial watertube boilers gives specifications, engineering and rnaintenance features, and uses. T h e series includes units that will deliIer from 1 to 6 million B.t.u.'s per hour. Bulletin No. AD-238. Cleaver-Brooks Co. 213 Gas Cleaning Equipment. Bulletin 1000 covers electrostatic precipitators, fabric filters, scrubber systems, and mechanical collectors for control of air pollution, recovery of 'r aluable materials suspended i n process gas, and cleaning of waste materials from a useful gas. Operating principles and principal applications are given. KesearchCottrell, Inc. 214 Atomizing Nozzles. A summary of the types of air actuated hydraulic and pneumatic atomizing spray nozzles that are available for automatic operation i n a production spray line is given. Bulletin 144 illustrates and describes standard liquid inlet designs, nozzles with recirculating inlets, and assemblies with extensions up to 48 inches i n length. Spraying Systems Co. 215 Plastic Fasteners. Containing numerous types of plastic fasteners, the Catalog *I10 details a large variety of screws, bolts, nuts, and washers. Materials include nylon, PVC, Teflon, polyethylene, polystyrene, Delrin, mica, phenolic, and vulcanized fiber. Many new items are listed and described. 216 Products Coniponents Gorp. Demineralizers. A six-page catalog describes mixed-bed, two-step, and nonregenerable demineralizers. Capacities range from a 1 gal.-per-min. faucet-connecting model to 50 gal.-per-min. units. Features include plastic disk strainers and plastic-lined, spark-tested steel tanks, Aqua-Con Products Co. 217
