Patent GB-190224133-A (GB)
Title: Improvements in and relating to Steam Boilers with Superheaters.
Inventor: POKRZYWNICKI MIECZYSLAS DE
Filed: 1902-11-04
Granted: 1903-03-05
Abstract: 24,133. Pokrzywnicki, M. de. Nov. 4. Superheaters, steam.-A superheater of any suitable construction is placed in a dome above the firebox uf a locomotive or other boiler, with which it is in direct communication. Arrangements of valves are also provided so that either wet or dry steam, or both together in any desired proportion, may be admitted to the engine, the admission of steam to the superheater being simultaneously controlled. Means are also provided for intensifying the draught of the fine gases through the superheater dome. Figs. 1 and 5 show one arrangement of superheater and valves as applied to a locomotive. The superheater 1 is placed in a dome 3, which opens below into the firebox. A deflector 6 and partition 7 direct a portion of the fine gases through the superheater to the upper rows of fire-tubes 4. A sliding damper 8 is arranged to be lowered whenever the supply of steam to the engine cylinders is cut off by the regulator handle 11 ; it is made hollow, and is cooled by air circulation, which is induced by means of a hood as the locomotive moves forwards. The damper is attached to the piston of a steam cylinder 32, the valve of which is connected by linkwork to the regulator handle. Wet steam is admitted to the superheater from the steam dome by the pipe 12, Fig. 5, and dry steam is led away to the engine cylinders through the pipe 13, which has a loop rising up into the dome, as shown in Figs. 1 and 5. The descending limb of the loop has a partition 19, Fig. 1, and is fitted with a sliding grid valve 17 by which communication between opposite sides of the partition 19 is controlled. On the valve 17 works a slide valve 16, which is operated by the regulator handle 11. Admission of wet steam to the superheater is controlled by a slide valve 14, Fig. 5, which is attached to the valve 17, both being operated together by the hand-wheel 18. In the position shown, the valves 14, 17 are open, but the valve 16 is closed. On drawing down the valve 17, the valve 14 is closed, and dry steam can no longer pass from above the partition 19 to the part of the pipe 13 below it ; wet steam can, however, be admitted to the pipe 13 below the partition by means of the valve 16. By putting the valve 17 in an intermediate position, a mixture of wet and dry steam can be admitted to the engine cylinders on opening the valve 16. Fig. 11 shows another arrangement of superheater chamber 3, to which heating-gases are admitted from the firebox 2 by tubes 26, and from which they are led away by tubes 27. The gases may be short-circuited by the valve 29, so as not to come in contact with the superheater. Fig. 15 shows one method of intensifying the draught through the superheater chamber by connecting the upper fire-tubes 4, which proceed from it, with a chamber a'in the smoke-box, and arranging the exhaust-blast pipe b to exhaust this chamber. In place of this arrangement, the blast pipe may be arranged to deliver above a partial horizontal partition in the smoke-box, above which only the fire-tubes 4 open, as shown in Fig. 17 ; or chambers f, Fig. 19, may cause the tubes 4 to discharge immediately below the funnel.