US1466278A - Steam superheater - Google Patents

Description

.Aug. 28, 192-3.

Q. B. FORWARD STEAM SUPERHEATER Filed Jan. 1919 2 Sheets-Sheet 1 1,466,278 c. B. FORWARD STEAM SUPERHEATER Aug. 28, 1923.

Filed Jan. 5, 1919 2 Sheets-Sheet 2 Patented Aug. 28, 1923.

. UNITED ST CHAUNCEY BLAIR FORWARD, OF URBANA, OHIO.

STEAM SUPERHEATER.

Application filed January 3, 1919. Serial No. 269,425.

T 0 all whom it may concern:

Be it known that CHAUNoEY BLAIR Fon- WARD, a citizen of the United States, residing at Urbana, in the county of Champaign and State of Ohio, has invented certain new and useful Improvements in Steam Superheaters, of which the following is a specification.

My invention relates to an mprovement in steam superheaters, and the improvement resides more particularly in a new and novel super-heating unit having a longitudinally, corrugated body constructed to wlthstand intense heat and high internal pressures without distortion and collapse.

In the accompanying drawings, Fig. 1 1s a cross section of a portion of a furnace or boiler embodying my invention,-and Fig. 2

is a plan view thereof andsection on line 2-2, Fig. 1. Fig. 3 is a side elevation of super-heating pipe section constructed according to my invention. Fig. 4 is an enlarged perspective view of one end of said section.

In practicing processes of refinlng oil involving the use of super-heated steam, I have utilized steam super-heating coils placed within the throat of a combustion chamber of a furnace where the coils of ipe are subjected to an intense heat from the fire. To withstand this heat for long periods I have encased portions of the pipe in protecting shells. Such protection 1s not new broadly, but of the 'varlous modes of rotection afforded as known to me none ave been found entirely satisfactory by me until the present invention was developed. As shown, this invention comprises a straight pipe section 2 which is adapted to be joined to other pipe sections by elbow fittings or expansible loops 3 to form a superheating coil. This coil may be placed in a separate steam super-heating furnace or mounted as an auxiliary heater withm the furnace walls of a steam boiler. In the present instance I show a boiler 4 of the Sterling type with a steam super-heating coil mounted therein at a point immediately above the fire chamber 5 and preferably in the throat 6 adjacent the fire arch 7 and'immediately beneath the inclined boiler tubes 8. Any number of pipe sections in the coll may be used dependent uponthe degree of temperature desired and the relative location of the super-heating coils, and the placen'ient of the coil in the throat 6 may be changed according to the requirements and the particular type of furnace involved. In any case, however, the pipe sections that are exposed to the direct flames must withstand an intense heat, and I therefore provide sections of pipe 2, with cast metal shells 3 of special construction and design so as to reinforce the pipes as well as to provide thepipes with an additional body aof metal adapted to heat up toa high degree for steam super-heating purposes. Each shell 3 is corrugated longitudinally, that is the body of the shell .is provided with longitudinal ribs 9 and grooves 10 on opposite sides thereof, and is further provided with a longitudinal rib 11 projecting upwardly from its upper flat face 12 centrally in line with the pipe 2 and of a greater height midway than at the ends of the shell. The bottom face 13 of the shell is also corrugated or provided with a longitudinal rib 14: on the center line thereof, and this bottom rib may be the same as or of less height or depth than the top rib 11. Ribs 11 and 14 are moreover of less length than the body of the shell, while the end portions of the shell are fiat top and bottom so that they may be securely seated in the brick walls 4 of the furnace and prevented from turning. and being displaced. Such shell ends facilitate the building of the wall and the setting of the shells, and the pipe may be inserted into the shells with atight fit or the shell cast on the pipe. In practise I prefer to cast the shell directly upon the straight pipe section 2 leaving a predetermined lengthof pipe end extending beyond each end of the shell. Thus in installing thepipe sections in a furnace, the shell sections are loosely seated within the walls of the furnace to permit expansion, and the pipe ends extend through the wall and the elbow fittings or loops are connected outside of the wall to ad acent parallel pipes of the coil.

All of the pipe sections of the coil may embody shells as described, but in practise I find that only those exposed to the most intense heat require such protection. Each pipe and shell is a unit which may be embodied in a coil or used in an suitable combination in a superheater. s I have used these units I find it a distinct advantage to employ a single cast shell extending the full width of the furnace and to have the ends thereof seated for expansible movement within the walls of the furnace, and to avoid sagging, distortion or collapse of the pipe and shell I find it quite essential to have the longitudinal ribs on the shell as described. Moreover, these ribs serve as heat-transmitting elements as well as strengthening elements and permit the body of the shell to be made thinner than if the shell were plain. The adjacent longitudinal ribs of parallel shells are spaced apart more or less irregularly in the bank of pipe sections which make up the coil, and the vertical ribs on the shells may thus be utilized as baflle elements in addition to strengthening elements. The top rib 11 is also in a more protected position from the flame than the bottom of the shell.

In summary, each superheating unit as described is adapted to withstand an intense heat and high internal pressure While serving efiectively to transmit the heat to the pipe to super-heat the steam passing therethrough, and one or more such units may be used 1n any type or kind of boiler or turnace where an intense heat is generated and high temperatures of steam or super-heating of steam is desired.

What ll claim is:

1. A steam superheating unit, comprisin a pipe having a cast metal shell, cast fufi length in contact therewith provided with flat-seating surfaces at its opposite ends, and said pipe extending straight beyond said ends.

2. A furnace having opposite walls, in combination with steam supcrheating pipes having cast metal shells in close contact the full length thereof provided with fiat extremities seated within said walls and ribbed longitudinally between said extremities, and the o posite ends of said pipes being extende beyond the ends of said shells and projected outside of said walls, and expansible loops connecting the ends of adjacent pipes and providing a continuous superheating coil.

Signed at Cleveland, in the county of Cughoga, and State of Ohio, this 19th day of ecember, 1918.

CHAUNCEY BLAIR FORWARD.

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