US2055949A - Heat exchanger - Google Patents

Description

Sept. 29, 1936. R. A. SHARP 2,055,949

HEAT EXCHANGER Filed Feb. 28, 1935 2 Sheets-Sheet l @Mkmkkv Jf/mirdAj/wrp y 0m Q! Sept. 29, 1936.

R.A.SHARP HEAT EXCHANGER Filed Feb. 28, 1935 2 Sheets-Sheet 2 m mm flaw/"5A- 5/75/17 entirely, as shown at 23, or may be provided with ports through which the space within the hollow partitions l8 and I9 is communicated with the boiler space containing the water so that the water is free to enter the hollow partitions l8 and l 9 which thus become water legs. Obviously, the water level within the boiler must be maintained higher than the partitions i8 and !9.

With the partitions l8 and I9 constructed in this manner so as to utilize the water contents of the boiler as a heat-insulating medium, the upper and lower chamber or compartments of the headers are positively separated from each other without the need for refractory linings on the partitions i8 and i9.

Connecting'the lower compartments I5 and ll of the headers l0 and II, respectively, is a main' or any other suitable medium may be introduced into the fire tube 24. I

The opposite end of the fire tube 24 opens to the lower chamber l5 of the header III. In line with this end of the tube is a refractory barrier 26 covering the end wall 6 against which the flame or other heating medium projected through the tube 24 impinges. Directly beneath the point of communication between the fire tube 24 and the lower chamber I5 is a refractory barrier 21 and to one side thereof is another refractory barrier 28. These barriers extend across the lower chamber l5 of the header ill to divide the same into separated compartments 29 and'30.

, A plurality of fire tubes 3| connects the lower chambers l5 and ll of the headers l9 and ll, respectively, beneath the partitions l8 and IS. The ends of these tubes are anchored in the partition walls 8 and 9 as is customary and open to the chambers l5 and I1. Some of these tubes communicate with the compartment 29 and others communicate with the compartment 39 at their ends secured to the partition wall 8.

Within the lower chamber I! of the other header H is a transverse horizontal partition 32 in line with the partition 21 which divides the chamber i1 intoan upper compartment 33 and a lower compartment 34. Through the provision of these baflles or partitions within the lower chambers l5 and II, the heating medium is caused to flow back and forth through the tubes 3 I so that the heating medium makes a plurality of passes back and forth, and while the structure shown provides for four passes, or may be termed a four pass boiler, an arrangement providing for a greater or lesser n'umbenof passes as the size 5 of the unit may dictate can be employed.

'titlons l8 and I9 comprises a heat exchanger through which the material to be heated is circulated. This heat exchanger is substantially like the lower boilter section of the unit and comaoeaoee prises the upper chambers l4 and I5 of the headers ill and M, respectively, and a second plurality of tubes 36 connecting these upper chambers.

An inlet port 31 leading to the chamber l4 and carried by the end wall 6 provides for the entrance of the material to be heated and an outlet port 38 leading from the chamber l6 and carried by the end wall I providesfor its discharge.

' The chambers I4 and. I6 are provided respectively with transverse partitions 39 and 40 which divide the chambers l4 and [6 into compartments and form bafiies to cause the material being heated to flow back and forth through the tubes 36, as will be readily apparent. v

From the description thus far, it will be apparent that this invention provides a combined steam boiler and heating unit capable of many uses, and while not limited to the heating of bituminous and similar heavy viscous. materials used in paving, to enable the pumping thereof from tank cars into transport trucks, it is admirably suited to this purpose and in Figure 4 the use of the invention'in this manner is diagrammatically iliustrated.

As here shown, the combined boiler and heat exchanger provides motive power for operating a steam pump 4| by which the material being handled is pumped from a tank car 42 through the heat exchanger and either back into the tank car or into a transport truck 43.

A steam line 44 connecting the steam jacket of the unit with the pump 4| provides for the operation of the pump, and a second steam line 45 leading from the steam jacket of the unit to the inlet of the steam coils in the tank car supplies steam to the coils. The outlet end of the coils has a return line 48 connected therei to, in which a steam trap 41- is interposed. A-

condensate return pump 48 also connected in the line 46 returns the condensate to the boiler.

The pump 4! has its inlet connected with the tank car by a pipe line-49 and its discharge port connected with the inlet 31- of the heat exchanger by'a pipe line 50. The outlet 38 of the heat exchanger is connected by a line 5| with a three way valve 52. Also connected with the three way-valve'52 is a line 53 leading to the transport truck, and a line 54 leading back to the tank car'42.

Hence, through control of the valve 52, the contents of the tank car may be pumped into the transport truck after being passed through the heat exchanger or may be continuously circulated from the tank car through the heat exchanger and back into the tank car.

As noted hereinbefore, this is but one manner of using the invention and is described merely for purposes of illustration. Other uses and adaptations of the combined steam boiler and heat exchanger unit will suggest themselves to those skilled in the art to which this invention appertains.

What I claim as my invention is:

'1. A heat exchanger comprising an outer shell, walls closing the ends of the shell, partition walls spaced inwardly from the endwalls and cooperating therewith to define headers, a plurality of tubes connected at their ends with the partition walls and communicating the headers, means to divide each headerinto separated chambers, said separated chambers of the headers together with the tubes communicating the same providing for the circulation of a heating medium and a fluid to be heated, one of the tubes for the circulation of the heating medium being of large within the shell and around the tubes forming a container for a heat transfer medium to facilitate the transmission of heat from the heating medium to the fluid to be heated.

2. A combined steam boiler and heat transfer unit comprising an outer shell, a closed header at each end of the shell, a partition dividing each header into separateiLchambers, a plurality of tubes connected eat their ends with one of each eithetgwmchdmbers into which each header is divided, said tubes and the chambers communicated thereby providing passages through which a heating medium may be circulated, one of said tubes for the circulation of the heating medium being larger in diameter than the rest, a tubular extension forming substantially a continuation of said larger tube through one of the headers to provide an inlet for the heating medium so that said larger tube forms an initial combustion chamber, a second plurality of tubes connected at their ends with the other chamber of each header, said second plurality of tubes together with the header chambers which they communicate affording passages through which a fluid to be heated may be circulated, and the space within the shell not occupied by said tubes affording a container for a heat transfer medium to facilitate the transmission of heat from the heating medium to the fluid to be heated.

3. In a heat exchanger of the character described, an outer shell, a hollow header closing each end of the shell, said headers having outer and inner walls; a partition dividing each header into separated chambers, a plurality oi fire tubes having their ends connected with the inner walls of the headers beneath the partitions in the headers to communicate the lower chambers thereof, one of. said fire tubes being larger in diameter than the rest and having an extension at one end directly through the adjacent hollow header so as to provide an inlet into which the heating medium may be directly injected and whereby said larger diameter tube forms an initial combustion chamber, bailles in said lower chambers to direct a heating medium injected into said flre'tubes back and forth through said fire tubes, an exhaust lower chambers of one of the headers through which spent heating medium is exhausted, a second plurality of tubes having their ends connected with the inner walls of the headers above the partitions in the headers to communicate the leading from one of said upper chambers thereof, baflles in the upper chambers of the headers to direct the flow of fluid to be-heated back and forth through said second set of tubes, an inlet leading to the upper chamber of one of the headers to provide for the entrance of fluid to be heated, and an outlet from one of the upper chambers of one of the headers for the fluid to be heated, the space within the outer shell not occupied by said tubes providing a container for water and a jacket for steam developed upon heating of the water.

4. A heat exchanger of the character described comprising an outer shell, a hollow header closing each end of the shell, each header having an inner wall and an outer wall, a hollow partition dividing each header into separated chambers, the inner walls of the headers being open to communicate the interior of the hollow partitions with the interior of the outer shell so that water contained within the outer shell is free to enter the hollow partitions, a plurality of fire tubes having their ends connected with the inner walls of the headers beneath the hollow partitions to cooperate with the lower chambers of the hollowheaders and provide passages through which a heating medium may be circulated, and a second plurality of tubes connected to the inner walls of the headers above the hollow partitions to cooperate with the upper chambers thereof and provide means through which a fluid to be heated may be circulate 5. A combined steam boiler and heater for viscous materials comprising an outer shell, 9, hollow header at each end of the shell, each header having an inner wall and an outer wall, a partltiondividing each header into separated chainbers, a plurality of flre tubes having their ends connected with the inner walls of the headers at one side of the partitions to cooperate with the header chambers at that side of said partitions to provide for the circulation of a heating medium, one of said fire tubes being larger in diameter than the others, and the outer and inner walls of one of the headers having aligned openings of substantially the same diameter as said larger tube, a tubular member of refractory material extending across said header in line with said openings to form substantially a continua tion of said larger tube and provide an inlet leading thereto through which a heating medium may be injected directly into said larger tube for circulation through said fire tubes, and a second plurality of tubes connected to the inner walls of the headers on the other sides of said partitions to cooperate with the header chambers at that side of the partitions to provide for the circulation of a fluid to be heated.

RICHARD A; SHARP.

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