GB297423A - Air preheater and dust collector - Google Patents

Abstract

297,423. Drake, W. C., Priebe, E. B., and Buchert, H., (Assignees of Coutant, J. G.). Sept. 21, 1927, [Convention date]. Feedwater, heating.-A furnace air heater applicable also for heating water consists of a number of tubular elements through which the gas passes and is subjected to centrifugal action, thereby causing the dust to pass out through lateral apertures. One form of tubular element is shown in Figs. 5, 5<a>, and consists of a metal tube a split longitudinally to form an opening a<1>; the tube contains a steel strip a<2> twisted into a helical form to cause the gases to rotate. In another form the split tube contains a wire helix upon its inner surface. In another. form two tubes a, a<5>, Fig. 7, are used; the inner tube a contain the helix and causes the separation of the dust while the liquid or gas to be heated passes through the space between the tubes. The tubular elements are built into units of the sector type, as shown in Fig. 9, or the rectangle type as shown in Fig. 10. A plate b is arranged near the lower end of each unit casing d to catch the separated dust and lead it to the discharge opening from whence it is taken by a worm or other conveyer back to the combustion chamber. A number of rectangle-units are shown combined in Fig. 1 to form a pre-heater and separator, the apparatus being provided with connected valves f<2>, g<2> to control the flow of gases. A motor j<2> operates the valves so that the units are open in pairs. With the parts in the position shown, the. hot combustion gases enter the lower rear opening i<2>, pass through a valve and upwards through the unit e<3>, where they yield their heat and dust, then emerge through the upper open valve and pass out through the conduit h<2>. The cold air to be heated enters through conduit h<1>, passes through an open upper valve, through the unit e<1>, where it is heated and escapes through opening i<1>. After a certain time the valves are operated to change the units in use. In the form shown in Fig. 2, the units are built into a cylindrical form. The cold air to be heated enters through the pipe n<2> and passes through a rotary slide n to the tubular heaters. It leaves the heater by the lower rotary slide o and pipe o<2>. The hot gases enter by the pipe m<3>, pass through the tubular members not covered by the slides n, o, and leave the apparatus by the pipe m<4>. The separated dust is collected by conical collector sheet b<2> and may be withdrawn through the hollow shaft p and the pipe p<1>. In another form the pipes and slides n, o are stationary, while the tubular structure is rotatable.