- Email: [email protected]
Electric boilers use jet conduction
182
C~JRRENT TOPICS.
Electric Boilers Use Jet Conduction.-((Electrical
[J. 1;. 1.
World, Vol.
105, No. 23.) A new type water-jet, high voltage electric boiler developed by Brown Boveri differs from all previous designs in principle and construction. Electric current is conducted through a number of water jets which radiate continuously from nozzles to the electrodes. Three electrodes are arranged concentrically about a vertical ejection pipe provided with three vertical double rows of nozzles to which water is supplied from a circulating pump. Water from the nozzles impinges tangentially on the inner surfaces of the electrodes, spreads and is deflected downward in a helical path. Tubular extensions are provided at the lower ends of the electrodes in order to concentrate the water into a jet which impinges on a perforated plate that is electrically connected to the boiler shell. Two current paths of constant length are formed per phase between the neutral point of the electrical system, to which the boiler shell and injection tube are connected, and the electrodes. One path is between the ejection tube and the electrodes, the other between the electrodes and the perforated plate. The water, along both paths, is heated by its own resistance. Under operating conditions the water is practically at evaporation temperature, since it flows continuously in a closed circuit. The greater part of the The boilers energy supplied, therefore, is used for evaporation. are built for 3 phase operation from 2000 volts upward and for outputs of 300 kw. to IO,.OOOkw. and above. They can be used in standby steam power plants to keep the large steam boilers warm and ready for operation. R. H. 0. “ It was while riding atop a London bus one night that Professor Kekulit saw the atoms dance about and arrange themselves into his famous ’ benzene ring.’ “-T. A. Boyd, “ Research.” High Voltage Condenser Welding.-(Power Plant Engineering, Vol. XXXIX, No. I I.) The idea of producing welds by condenser discharge is not new. Attempts at this were based upon the application of condensers at low voltage, that is, the discharge current was delivered directly to the welding spot. In a recent number of The Welding Journal of the American Welding Society, Engineer G. I. Babat of the Research Laboratory of the Svetlana Works, U. S. S. R., describes a new method in which a condenser is charged to a high potential by a rectifier supplied from the a.c. mains. The charge stored in the condenser passes through the primary winding of a transformer under control of a special mercury vapor discharge tube, with a special igniter. This tube is capable of passing im-
C~JRRENT TOPICS.
Electric Boilers Use Jet Conduction.-((Electrical
[J. 1;. 1.
World, Vol.
105, No. 23.) A new type water-jet, high voltage electric boiler developed by Brown Boveri differs from all previous designs in principle and construction. Electric current is conducted through a number of water jets which radiate continuously from nozzles to the electrodes. Three electrodes are arranged concentrically about a vertical ejection pipe provided with three vertical double rows of nozzles to which water is supplied from a circulating pump. Water from the nozzles impinges tangentially on the inner surfaces of the electrodes, spreads and is deflected downward in a helical path. Tubular extensions are provided at the lower ends of the electrodes in order to concentrate the water into a jet which impinges on a perforated plate that is electrically connected to the boiler shell. Two current paths of constant length are formed per phase between the neutral point of the electrical system, to which the boiler shell and injection tube are connected, and the electrodes. One path is between the ejection tube and the electrodes, the other between the electrodes and the perforated plate. The water, along both paths, is heated by its own resistance. Under operating conditions the water is practically at evaporation temperature, since it flows continuously in a closed circuit. The greater part of the The boilers energy supplied, therefore, is used for evaporation. are built for 3 phase operation from 2000 volts upward and for outputs of 300 kw. to IO,.OOOkw. and above. They can be used in standby steam power plants to keep the large steam boilers warm and ready for operation. R. H. 0. “ It was while riding atop a London bus one night that Professor Kekulit saw the atoms dance about and arrange themselves into his famous ’ benzene ring.’ “-T. A. Boyd, “ Research.” High Voltage Condenser Welding.-(Power Plant Engineering, Vol. XXXIX, No. I I.) The idea of producing welds by condenser discharge is not new. Attempts at this were based upon the application of condensers at low voltage, that is, the discharge current was delivered directly to the welding spot. In a recent number of The Welding Journal of the American Welding Society, Engineer G. I. Babat of the Research Laboratory of the Svetlana Works, U. S. S. R., describes a new method in which a condenser is charged to a high potential by a rectifier supplied from the a.c. mains. The charge stored in the condenser passes through the primary winding of a transformer under control of a special mercury vapor discharge tube, with a special igniter. This tube is capable of passing im-