Document Ramy9edZob2E3Z3kjNNkXeDrn

More TECHNICAL BRIEFS-_ _ _ _ _ _ _ _ _ _ _ steady elate efficiency ol ilie apparatus in the form nf steam, hoi woter or air uaed for this test was <50.0%. The effici boosts overall Btu utilization. Today, encies increase with boiler water tem through the development of a packaged peratures up to a moximum of 67.9% unit, recovery in the form of refrigera at 142* F. Further increases in boiler tion is possible, thus broadening the water temperatures resulted in a drop field of woste heat recovery application. in efficiency. The boiler woter is tlte Such a packaged unit, now available principal factor controlling the tempera- to the diesel Industry, Is said to operate lure of the crown sheet of the boiler, automatically at cost. It combines o and the chilling efTect of the crown sheet waste heal boiler and a hermetically- on the oil flame is, in our opinion, the sealed absorption refrigeration system, cause of the lower efficiencies at the oil mounted on one base. lower woter temperatures. The drop in A 4-cycle, 350-hp diesel engine'oper efficiency at the highest boiler woter ating at full load wastes enough heat temperoture is thought to result from through the exhaust gases to deliver the increased heat loss through the un ample heat units to operate a 25-ton insulated outer surface of the boiler. absorption refrigeration unit, therefore ASME Paper No. S3-F-20. packaged units sre assembled in dif Test Results of Medium Speed EnQlnes on Heovy Fuels. By Russell Pyles, Donqld P Cryor, 1 M A Van der Horst, Van ferent sites. These shea range from a unii (or a 3S(Mip engine with a 25-ton water chiller to a 3500-bp engine with a maximum of 250 tons of cooling. der Horst Corp of America. Heavy fuel use in the main propelling engines of ships has every indication of becoming general. Certainly it seems desirable from every anglo that the Larger units with variable refrigera tion requirements can be oisembled to meet specific requirements. ASME Paper No. 53-OGP-S. auxiliary engines should be capable of operating on the spine type of fuel. - The technical problems associated with heavy fuels In large, low-speed, main engines have had some years of development and study with such suc cess that there are now close to 500 motorahips operating on boiler fuels. The problems of the low-speed auxiliary engine (under 500 rpm) may be sim ilar to many of those problems encoun tered in the large, low-speed, main en A Photographic Study of Two-Cycle Oas Englno Cylinder. By R L Boyer, D L Craig, Cooper-Bessemer Corp and C D Miller, Battelle Memorial Institute. The more Important results from o two-year research program involving, it is believed, the fint high-speed pho tographic records of events within a very large engine cylinder make up this paper. This cooperative research, by Cooper-Bessemer Corp and Battelle gines, but as engine speeds increase, the old problems become more acute and new difficulties arise. Higher speed auxiliary engines will TO OBTAIN COMPLETE TEXT be demanded because of increased Material for these abstracts power requirements, lighter weight and comes from the following sources smaller apace. Such engines, operating unless otherwise slated. Order on regular diesel fuels, are already high complete paper from sources, not ly developed as typified by present-day Power. locomotive and marine engines. The American Society of Mechani most desirable course would seem to be cal Engineers, Oil and Cos Power to adapt this type of engine to heavy Dio, annua/ conference. Hotel fuels even though such a course involved Schroeder, Milwaukee, JFii., May development and design changes. ASME 25-28, 1953. Identified by initials Paper No. S3-OGP-6. ASME-OGP. Semiannual meet Converting Watte Engine Exhowtf Heal Into Energy. By Robert C Coblenit, Coblents Equip Co. An immeasurable source of untapped power is the millions of dollars worth of energy which constantly pours from engine exhaust stacks. Diesels, says the author, are tops in thermal efficiency and yel mere than half the Biu*s in the fuel is rejected to the jacket water or goes up the stack. A high percentage of this heat is recoverable and can be ing, Statler Hotel, Los Angeles, Calif., June 28 July 2, 1953. Iden tified by inftiaii dSME-S and obtainable through ASME, 29 V 39th St, New York 17, N. Y. Air Pollution Control Assn, an nual meeting, Lord Baltimore Hotel, Baltimore, Md, May 2528, 1953. Identified by Initials APCA and obtainable through R T Griebling, exec secy, APCA, 4400 Fifth Aoe, Pittsburgh 13, Pa. used to advantage. Waste heat recovery Memorial Institute, involved . r J CMV spark-ignited ratine 0| 14-hch lT' end 14-inch ireke, operniln, ,n T' urnl ge). It h urad widel, I., Ih, Ing ol nolurol (ni ihrooBh eroiMo^ try pipelines. uo* Schlleren photographs were tskea of combustion, exhaust blowdown, sea^ cnglng, gas turbulence, and fuel iojto. tlon, through large gloi* window, mounted at various positions in the c|. Inder head and cylinder wall. Slow motion pictures made all of these pha! nomena clearly visible. Exact data were secured lor all gas and flame velocities involved, as well as the crank-angle* these events. The bosic noture of flow of sesveag. ing air through the cylinder volume in turbulent jets, which apparently cannot be circumvented, seemed the most val uable data obtained through this re search program. ASME Paper No. S3-S-45. Flomo Temperatures In o Single Cyl inder Spatfc-fgnlflon Engine. By J R Potter and R B Dillauray, Unit of lUi. nais. Interest' in flame temperature in the ' cylinders of internal combustion engines hat brought to light many ingenious . experimental techniques. Early work ers used thermocouples or resistance thermometers of limited valoe because. ol thermal lag, mechanical instability, temperature damage and location. In an electro-optical method worked out by Graff, radiation from alkaline salts in the working mixture in an en gine-cylinder was focused on e photo cell. The use of photographic filters" narrowed the wave length band through which energy could be transmitted to the photocell. An amplifier and a cathode ray oscillograph were used, and , the vertical deflection on the oscillo graph pictures was calibrated is tcn&i of temperature. Thla marked en Impor-; tant forward step -as? 1) Individual eyelet could be observed, 2) The whole cycle could be caught in o given photo graph, ft) The maximum and minimum peek temperatures could be fontTM, whereas the line reversal method gave on average of many cycles. But the disadvantages of the Graff method were: 1) Difficulty In calibra tion, 2) Need for control ol coMtanej `of sodium concentration, 3) Relative complexity of the electronic equtpmen*The present paper is built arw" experiments made on the engine I** erator set used by Herahey in *ddw the Groff technique wos employed- Tb* (Continued on page 236) 132 REAPER SERVICE SECTION POWft NOVEMOER I9SS OVER 1,000,000 TONS ROM AND SCREENINGsTnEDUCED TO %" PRODUCT PARTS REPLACEMENT COST_ _ _ _ _ _ V4 CENT PER TON! PULVERIZER COMPANY 1349 Mocktlnd Ave. St. louU 10, Mo.