US2147046A - Heating unit - Google Patents

Description

FA LEONI HEATING UNIT Feb. 1K4, 1939.

Filed Feb, 25, 1957 E Sheets-Sheet l ATTORNEY Feb. 14, 1939. P, LEON| I l2,147,046

HEATING UNIT Filed Feb. 25, 1937 2 Sheets-Sheet 2 ATTORNEY Patented Feb. 14, 1939 l PATENT lori-"Ici:

'- HEATING UNrr Pilade Leoni, Providence, R. I., Iassignor to Lemurflncorporated, Providence, R. I., `arcorvpof ration of Rhode Island Application YFebruary 25, 1937, Serial No. 127,625

f 2 claims.

This is a new yand 'useful improvement relatingv to a mechanical and physical arrangement for the better recovery of the'heat generated through the combus'ion of fuel for the purpose of `heating water or other liquid medium to generate steam, or for other uses to which 'this improvement may adapt itself.

The chief object of my improvement makes for a' greater elimination of heat losses in the process of heat transfer to a medium to be heated. The semi-flash production of steam in a boiler is another object. A further object of this improvement is the application of the heat generatedthrough the combustion of fuel, rst to the upper levels of the liquid medium to be heated and then successively to the subsequent lower strata of said liquid medium,

Other advantages and other objects of my improvement may be more apparent from consideration of the details described and claimed.

With references to the drawings,

Figure l is a vertical section of the boiler taken along line C-C of Figure 2, and showing a part of the lower casing broken away.

Figure 2 is an end View of the upper part of the boiler section taken along line B-B of Figure 1, and shows the arrangement of heat conduits 20 and 2I. Y

Figure 3 is a vertical section of Figure 2 taken along line A-A of Figure 2 and shows the arrangement of the heat passages or conduits on each side of the combustion chamber.

Figure 4 is a general view of the assembled sections of the boiler with the gas burners rings 28 and 29 in position at the inlet 6 of the combustion chamber 5.

Referring to the drawings in detail, Figure 1 shows in section the three parts composing the boiler. The first section being the steam dome I formed by outer shell 2 and being equipped with steam port I'I, gauge port I4a, safety valve port I6, and a flange 3. Flange 3 is bolted to the next lower section of the boiler by bolts II,

The second section of the boiler is formed by an outer shell 4, a combustion chamber 5 enclosed within said shell 4, and having its inlet 6 to the atmosphere, and outlets 'I and'la, to which are connected heat passages or conduits 2D and 2|. The outer shell 4 is equipped with upper flange 8 and lower iiange 9 which are bolted to the adjoining anges of the upper and lower section of the boiler by bolts I I and I la. l

The third section of the boiler is formed by outer shell I2 and the inner 4shell I9. Inner shell I9 is closed at the top and opened at the bottom,`an1d the lower edge of the outside shell I2, and inner shell I9 are bonded together to form the bottom of an. annular tank I8 into which, in subsequent lower circular layers, are placed heat passages or conduits 20 and 2I which iill the intervening space between tank I9 and tank I2 to the extent needed to leave only room enough for a film of water to rise on all sides of said heat conduits. Said heat passages or conduits have their upper ends. connected to the outlets.

l and "Ia of the combustion chamber '5, and have their lower ends protruding at the bottom of shell I2 and connected to the inlet 22 of a suction device 24 placed near the bottom outside of the boiler. Outlet 25 of suction device 24 discharges into a stack not shown, and is equipped with a drain 26. The annular tank I8 is provided with ports I4 for gauge andV other attachments, port I3 for the return of the condensed steam into said tank, and port I5 for the feed of liquid to said tank.

The liquid to be heated, as contained by said boiler unit, is kept within the boiler at such level as to barelysubmerge the combustion chamber and the heating conduits.

The combustion chamber 5 and the heat passages or conduits 2|] and 2| ll as much of the space which is surrounded by shell 4 as it is possible, but leaving just enough of it to allow a continuous film of water to rise to the surface so as to replace the water evaporated in making steam, and so as to maintain constant the level of the water in the bolier The operation of the boiler thus far described is as follows:

The boiler is lled with the liquid to be heated up to a level sufficient merely to submerge the combustion chamber 5 and heat passages or con' duits 20 and 2|. Suction device 24 is then put into operation and creates a vacuum inside the heat passages or conduits 20 and 2I and combustion chamber 5. Fuel is now admitted through inlet 6 into combustion chamber 5 and there combusted. The heat thus generated together with the products of the combustion are then car- .ried away through outlets 'I and 'Ia of the combustion chamber 5 into and through the heat passages or conduits 20 and 2| to the suction device 24 and then through its outlet 25 into the stack not shown.

Inasmuch as the combustion chamber 5 and the upper portions or heat passages or conduits 2|! and 2 I are immersed just below the very top surface of the liquid to be heated, it follows that the most intense heat generated through the combustion of fuel, is in direct contact, rst, with the top levels of the liquid, and successively with the subsequent lower levels of said liquid. 'I'his eiects the most prompt and eflicient transfer of heat to the liquid surrounding the combustion chamber 5 and the heat passages or conduits 20 and 2|, because the temperature of the liquid and the temperature of the above mentioned par-ts are divergent, that is: the heat, on its travels'from the combustion chamber through and along the heat conduits 20 and 2| to the lower levels of the liquid, always meets subsequent lower temperatures of said liquid.

Having thus described the nature and objects of my improvement and a preferred embodiment of the same, which embodiment is to be taken as illustrative rather than limitative, what I desire to secure by Letters Patent is:

1. A boiler unit comprising, in combination, a top section, a, mid-section and a lower section; all said sections being connected for water flow Yfrom the lower section to the top section; the

top section including a steam'chamber; the midsection enclosing within its walls 'a combustion chamber having its outlet connected to conduits coiled partly within the said mid-section and partly within the said lower section; and the lower section being composed of an inner circular shell closed at the top and of a larger outer circular shell the lower edge of which is bonded with the lower edge of the smaller shell to form an annular tank into which the said heat conduits descending from the combustion chamber in the midsection are coiled into successively lower layers, said heat conduits having their lower ends passing through the wall of the lower part of the outer shell.

2. A boiler unit comprising, in combination, a top section, a mid-section and a lower section; all said sections being connected for water flow from the lower section to the top section; the top section including a steam chamber; the mid-section enclosing within its Walls a combustion chamber having its outlet connected to conduits coiled partly within the said mid-section and partly within the said lower section; and the lower section being composed of an inner circular shell closed at the top and of a larger outer circular shell the lower edge of which is bonded with the lower edge of the smaller shell to form an annular tank into which the said heat conduits descending from the combustion chamber in the mid-section are coiled into successively lower layers, said heat conduits having their lower ends passing through the wall of the lower part of the outer shell; the said heat conduits substantially filling the sand tank whereby the flow of water from the lower section to the top section is so restricted as to substantially replace the water converted into steam in the top section.

PILADE LEONI.

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