US1918601A

US1918601A - Heat exchanger

Info

Publication number: US1918601A
Application number: US606852A
Authority: US
Inventors: George T Jacocks; Stanley J Chute; James B Forbes
Original assignee: Alco Products Inc
Current assignee: Alco Products Inc
Priority date: 1932-04-22
Filing date: 1932-04-22
Publication date: 1933-07-18
Anticipated expiration: 1950-07-18

Description

July 18, 1933. G. T. AcocKs ETI' AL HEAT EXCHANGER Filed April 22, 1932 2 Sheets-Sheet 2 IN VEN TORS g6 ZZ/acacks m/0m 5. Horn; 7%. 2; A

ATTORNEY.

Patented July 18, 1933 UNITED STATES PATENT OFFICE GEORGE T. JACOCK S, STANLEY J. CHUTE, AND JAMES B. FORBES, 01 NEW YORK, N. Y

ASSIGNORS TO ALGO PRODUCTS, INCORPORATED, OF NEW YORK, N. Y., A CORPORA- TION OF DELAWARE HEAT EXCHANGER Application filed April 22,

Our invention relates to heat exchangers and more particularly to a high pressure, high temperature heat exchanger adapted for use in connection with the pyrolytic processing of hydrocarbon oils.

One object of our invention is to provide a novel construction in which no steel castings are'used adapted to sustain high pressures and high temperatures.

Another object of our invention is to provide a construction in which the minimum number of field connections must be made.

Another object of our invention is to provide a unit which is easily accessible for cleaning and inspection.

In the accompanying drawings which form part of the instant specification and are to be read in conjunction therewith and in which like reference numerals in the various views are used to indicate like parts;

Figure 1 is an elevation of our heat exchanger partly in section.

Figure 2 is a plan view of our heat exchanger.

Figure 3 is a sectional view partially broken away, taken on a line 3-3 of Figure 2.

Figure 4 is a sectional view taken on a line 44 of Figure 3.

In general, our mvention consists in a heat exchanger having a plurality of channel members welded to a single channel flange so as to form an integral channel member. The liquid entrance and exit connections are carried by the channel member. Bolted to the channel member are a plurality of shells formed in two parts, the lower portions of the shells being removable in parts without breaking the vapor connections for inspection and cleaning. Each shell is provided with a separate condensate drain and houses a tube bundle. The tubes are secured to tube sheets in the channel members at one end and at their other ends to a floating header. There is but a single floating header in each shell. No longitudinal baflles are used. Transverse baflles carried by the tubes are fitted.

More particularly referring now to thedrawings, channel flange 1 has welded thereto a 1plurality of, channels 2 connected to each 0t er by pipe connections 3 which are welded 1932. Serial No. 606,852.

to the respective channel members. Each partition members giving additional support and furnishing a means to secure the cover plates 5 thereto. The cover plates 5 are also hogged out of silicon killed steel and are secured to the channel members 2 by means of

short stud bolts

3 and 4 which enter the part1t10n members and channels respectively. It will be observed that the channel members together with their cover plates form a plursi ity of stationary sub-headers. The sub headers being welded to a plate 1 form a composite stationary header. We prefer to term the plate-1 the flange member. The stationar header assembly will be referred to as the stationary header, while the channel members and their cover plates will be termed sub-headers. Liquid inlet pipe 6 is welded to one channel member and liquid outlet pipe 7 is welded to the last channel mem ber. The lower portions of the channel member are made of unusual thickness to allow for corrosion and form heavy tube sheets capable of withstanding the high pressures with whichthe heat exchanger is designed to be used. Welded to channel flange 1 are lugs 8 adapted to support our heat exchanger. Bolted to channel flanged are a plurality of shells which; house the two bundles. The shells are formed in two arts, namely, upper parts 9 which haye'bolted thereto lower 10. K The vapor inlet connection 11 an the vapor outlet connection 12 are secured to the upper shell portions 9. The lower shell port1ons are bolted to shell portions 9 and are provided at their lower ends with condensate drain connections 13. The lower shell portions 10 are provided at their lower ends with vapor pass connections 14. The upper ortion of adjacent shell portions 10 are oined by brackets 15 so that two adjoining lower shell portions are secured to each other by brackets 15 and vapor pass connections 14.

arts

By reference to Figure 1, it will be obvious that if bolts 16 which secure the lower shell portions 10 to the upper shell portions 9 are removed, that a pair of lower shell portions may be dropped free to expose the tube bunciles 17 to inspection. If desired, vapor connections 14 may be made removable so that individual shells may be dropped for inspection if desired. The tube bundles 17 are provided with transverse bafiles 18 which are carried by the tubesand not by the shells so that the shells may be readily removed. No longitudinal baflles are used, each shell forming but a single vapor pass. By using this form of construction, coking and carbon depositions are avoided. The tubes 19 are secured to the lower portions of the channel members 2 which form upper tube sheets and are secured at the lower ends to floating headers 20. Floating headers 20 comprise floatingchannel members 21 and cover plates 22. The channel members 21 are similar to the upper channel members 2, being hogged out of a single billet of silicon killed steel. The cover plates 22 are likewise hogged out of silicon killed steel and provided with integral partition members 23. The arrows in the drawings indicate the flow of the liquid and vapor through our heat exchanger. Shells 10 are fitted with lugs 24 for lifting and handling the shells 10. By removing cover plates 5 the inside of the tubes may be readily inspected.

In operation, the liquid enters liquid inlet 6 into the first liquid pass of channel member 2 and flows downwardly into the first liquid pass of the floating header, thence upwardly to the second liquid pass of the channel member, thence downwardly to the second liquid pass of the floating header, thence upwardly to the third liquid pass of the channel member. This liquid flow is repeated for each channel and its respective floating header until the liquid leaves through liquid outlet 7. The vapors enter vapor inlet 11, flow downwardly through the first shell, thence upwardly through the second shell, thence downwardly through the third shell, thence upwardly through the fourth shell and leave through vapor outlet 12. Thus it is seen that there is but one vapor pass within each shell and the direction tively light weight. Due to thefact that.

there is but a single vapor pass through each shell, no longitudinal bafiles are necessary, which decreases the tendency to the formation of coke and carbon deposits. The elimination of longitudinal bafiies, furthermore, makes the shell easy of removal so that the tubes may be cleaned and inspected with minimum difliculty. The only high pressure connections necessary to be made in the field are the inlet and outlet channel connections, inasmuch as the connections between the various elements of the exchanger are made in the shop. This is true, likewise, of the vapor connections. The compactness of the complete unit and the accessibility for cleaning are apparent. The use of integral partition members renders the use of longer stay bolts unnecessary. Only short stay bolts are used which are tapped into the integral partitions between liquid passes and these are continuous with the circle stud bolts which hold the channel cover on around its circumference, insuring leak proof joints. The entire unit is supported by the lugs 8 and is easily installed.

It will be uderstood that certain features and sub-combinations are of utility and may be employed without reference to other features and sub-combinations. This is contemplated by and is within the scope of our claims. It is further obvious that various changes may be made in details within the scope of our claims without departing from I the spirit of our invention. It is, therefore,

to be understood that our invention is not to be limited to the specific details shown and described.

Having thus described our invention, what we claim is:

1. A high pressure, high temperature heat exchanger adapted for use in the pyrolytic processing of hydrocarbon oils, comprising in combination a flange member, a plurality of sub-headers integral therewith, tube bundles communicating with the respective subheaders, a floating header communicating with each tube bundle, separate shells surrounding each tube bundle and removably secured to said flange member, communicating means between the sub-headers, communicating means between the shells, a liquid inlet to one sub-header, a. liquid outlet from one sub-header, whereby liquid is adapted toflow, through said respective sub-headers, tube bundles and floating headers in succession, a vapor inlet to one shell, a vapor outlet from one shell whereby vapor is adapted to flow through said shells in succession in heat exchange relationshipwit'h said liquid.

2. A high pressure heat exchanger comprising in combination a stationary header, a plurality of floating headers, a plurality of tube bundles extending between the stationary header and the respective floating headers, a plurality of separate shells surrounding the respective tube bundles and floating headers and a. condensate drawofi connection for each shell.

3. A high pressure heat exchanger comprising in combination a stationary header, having a air of stationarysub-headers, a

air of oating headers, a pair of tube undies extending between the respective stationary sub-headers and floatin headers, a pair of separate shells surroun in the re spective tube bundles, said shel 8 being formed in two parts, a vapor inlet connection in one of the upper shell parts, a. vapor outlet connection in the other of said upper shell parts, a vapor connection between said lower shell parts and a bracket connecting said lower shell parts whereby the lower shell parts may be removed together for tube bundle cleaning and inspection, without breaking the vapor inlet and outlet connections.

4. A heat exchanger as in claim 2 wherein said stationa header comprises a flange plate and subeader members welded thereto, a liquid pass pipe between said sub-header members, cover plates to; said sub-header members, said members being hogged out of a single billet of silicon killed steel and having integral liquid pass partitions therein.

5. A heat excha er as in claim 2 wherein said floating hea' ers comprise members hogged out of single billets of silicon killed steel, integral liquid ass partitions in said members and cover p ates secured thereto.

6. A heat exchanger as in claim 2 in which the sole supporting means for the heat exchanger comprises lugs integral with said stationary header. I

7. A heat exchanger as in claim 2 in which said shells comprise upper and lower parts, vapor inlet and outlet connections secured to said upper parts, whereby said lower shell partsmay be removed for tube ins ction without breaking said vapor inlet an outlet connections.

8. A heat exchanger as in claim 2 wherein said tube bundles are provided with transverse baflies secured thereto and unattached to the shells, whereby said shells are rendered readily removable.

9. A high pressure heat exchanger comprising in combination a. stationary header, a luralit of floating headers, a plurality of tube bun les extending between the stationary header and the respective floating headers, a plurality of separate shells surrounding said tube bundles and forming a single pass for thetrav'el of vapors therethrough in heat exchange relation to liquid passing through the tubes of the tube bundles, whereby said vapors are condensed in said separate shells, and condensate drawoif connections for each shell.

- GEORGE T. JACOCKS.

STANLEY J. CHUTE. JAMES B. FORBES.