GB228218A - Improvements in or relating to air-heaters - Google Patents

Abstract

228,218. Owen, W. H. Sept. 3, 1923. Regenerators.-An apparatus for heating air, more particularly pre-heating air for combustion by utilizing the heat of waste gases, consists of metal sheets or cells arranged in groups to form elements for easy assembling in or removal from the casing of the heater. In the arrangement shown in Figs. 1 and 1<a> the plates are separated by packing strips 2 and held by rivets. The hot gases pass between the cells in the direction of the arrows 7 while the air enters the cells through the space 5 and leaves by the opening 6. Guides and stiffeners may be secured in the air cells, or the sides may be indented to form rims. The ends of the plates 9, Fig. 1f, may be welded or turned over as shown at 10. In another modification, the cells are formed of a continuous strip 1, Fig. 1<g>, and are held rigidly together by a binding strip 4. The bundles of cells are inserted in the casing through an opening closed by the door 4<x>, Fig. 2<a>. Bye-pass passages 5<x> are provided with dampers 10<x> so that the gases may pass straight through the casing when desired. Ducts may be provided so that air may be taken off at various temperatures. The heating cells may be arranged in tiers 1<a>, 2<a>, as shown in Fig. 3, and the air passes through the two in series. In another modification the air and gases pass through the heating elements in directions at right-angles to each other. When used with steam boilers of the cylindrical marine type the heater b, Fig. 5, is placed above the smoke-box e so that the waste gases pass through it direct to the chimney. The inlet and outlet air ducts c, d are arranged between the heater and the boiler e so that the air flows in the opposite direction to the waste gases. Steam or air pipes for blowing out soot are placed where desirable. Different metals may be used for the plates in different groups in order to resist corrosion.