Patent GB-190510107-A (GB)
Title: Improvements in and relating to Furnaces or Apparatus for Supplying Heated Air and Gases for Industrial purposes.
Inventor: CLARK PATRICK DUNCAN GOURLAY
Filed: 1905-05-13
Granted: 1906-03-15
Abstract: 10,107. Clark, P. D. G. May 13. Furnaces. - Relates to furnaces or apparatus of the kind described in Specification No. 18,110, A.D. 1903, for supplying a mixture of heated air and combustion products from a furnace for heating, drying, or otherwise operating upon tea. coffee, beans of various kinds, cardamoms, and other materials requiring to be similarly treated, and consists chiefly in improving the combustion of unconsumed combustion products by supplying heated air above the fire, and in providing means whereby the products of combustion, when it is undesirable to mix them with the heated air, may be allowed to escape separately. In the arrangement shown in Fig. 3, in addition to the air supply for primary combustion by the pipe b, air under pressure is supplied by pipes d to chambers c, from which it issues, by means of perforations c', and mixes with the combustion products. The perforations c<1> are made of various sizes and arranged so that a small opening in one chamber is opposite to a large opening in the other. The perforations, bowever, may be all of one size. The air with which the furnace gases are to be mixed enters, preferably under pressure, by pipes e on each side of the furnace, and passes by means of passages f to several series of pipes g, g<1>, around which the combustion products pass prior to escaping through openings h<1> in the roof of the combustion chamber. The escaping products pass into a passage enclosed by the cover k, and are led to the pipes g, g<1>, where they mix with, and become further heated with, the air before escaping to the chamber m and to the chamber in which the substances are to be treated. In the modified form of apparatus shown in Fig, 8, the air for primary and secondary combustion is, for the purpose of being preliminarily heated, passed through chambers p, p<1> arranged within the casing in the apparatus, and the heated air escapes to the ash-pit and the chambers c through pipes b<2>, d<2>. Some of the air-heating pipes g, g<1> deliver air only to the space m, and the remainder are formed with openings g<6> for the entry of furnace gases, which also escape to the space m, where they mix with the heated air. Instead of the pipes g, g<1> being arranged as shown, they may be arranged similarly to those shown in Fig. 3, and vice versa. The horizontal portions of the passages f below the grate are, in this modification, formed of tubes. Fig. 10 shows a further modification in which the pipes g, g<1> are inclined, and the passages f do not pass beneath the grate but return on the same side of the furnace. To obtain heated air alone as desired, the form of apparatus shown in Fig. 12 is adopted. The combustion products are directed to the chimney t or to the tubes g, g<1> by operation of the valves v that control the openings k' leading to the chimney and the openings s leading to the tubes g, g<1>. Solid, liquid, or gaseous fuel may be used in the furnace, and the means described above for supplying air for secondary combustion may be supplemented, if desired, by the means described in the prior Specification.