US1957742A - Wall-wash flange - Google Patents

Description

y 1 3 J, VAN DER WERF 1,957,742

WALL WASH FLANGE Original Filed July 1929 Patented May 8, 1934 UNITED WALL JVASH FLANGE Application July 12, 1929, Serial No. 377,681 Renewed May 23, 1932 ATES PATENT FFHCE 5. chamber.

5o chamber.

6 Claims.

This invention relates to improvements in a wall-wash flange, and has for its principal object the provision of means for obstructing the path of a fluid introduced into a closed receptacle, direct- 5 ing the flow of the fluid to the walls of the receptacle, and imparting to the said fluid a swirling motion as the same impinges upon the said walls.

In the distillation of hydrocarbon oils, and particularly in cracking processes, a receptacle or 10 container is utilized commonly known to the art as a reaction or expansion chamber. The charging stock is first passed under pressure through a heating zone, usually a continuous tube, wherein the charging stock is raised to the cracking temperature. The heated oil is then conducted to the so-called reaction or expansion chamber, usually an enclosed cylindrical vessel disposed vertically. In general practice, the oil enters at the top of the chamber through a conventional pipe, no nozzle or the like being used.

Later a wall-wash flange was disposed at the discharge end of the pipe, and comprised a blind flange bolted against another flange of the same diameter which was screwed on the transfer line 2 extension. Both flanges were kept at a distance from each other of approximately 7 or thereabout, by means of two bolts passing through both flanges and preferably disposed diametrically opposite each other.

3 The purpose of the wall wash flange above described is to provide a means for discharging the oil from the heating coil into the chamber in such a manner that the non-vaporized oil is caused to run in a thin film along the inner walls of the Although it is not known with certainty what causes the beneficial result obtained by the use of this feature, it has been found that a lower amount of coke forms both in the chamber and in the residuum from the process, for an equal quantity of raw oil treated, than with the use of the common method of discharging the oil into the upper part of the chamber without providing any means for the direction and distribution of the stream of hot oil discharging in the chamber.

Practice has shown that the above described flanges have been very successful. However, in some instances, strips of hard coke were found and had to be removed from the walls of the Incidentally, these coke strips were found directly opposite the two connecting bolts.

Accordingly, one of the objects of the present invention is to impart to the fluid admitted to the chamber a swirling, turbulent motion when the same impinges upon the walls of the chamber,

thus preventing a dead or motionless spot of liquid upon any portion of the wall. More particularly, a series of vanes or curved fins are pro vided between the two flanges of the wall wash device, whereby the discharged fluid is caused to leave the flanges at an angle other than 90 to the periphery of the flanges, and likewise impinges upon the walls of the chamber an angle other than 90 thereto. Hence, the formation or the above mentioned strips of coke is eliminated and consequently cleaning of the reaction chamberto remove these strips is not necessary, yet all the advantages of the wall wash flange are obtained.

Other and further important objects or" the present invention will be apparent from the accompanying drawing, and the following description.

In the drawing, Fig. 1 is a vertical elevation of a reaction chamber, parts being broken away, '35 and other parts shown in section, illustrating particularly the positioning of the flange within the chamber.

Fig. 2 is a transverse section taken on line 2-2 of Fig. 1, looking in the direction of the so arrows.

Fig. 3 is a sectional view, taken on the line 3-3 of Fig. 2, looking in the direction of the arrows.

As shown in the drawing, 1 indicates generally a receptacle such as a reaction chamber or the like, having residuum outlet lines 2 controlled by valves 3.

A transfer line 6 enters the chamber at the top thereof and is adapted to deliver oil from a suitable heating zone (not shown). In the chamber, vapors separate from unvaporized oil; the latter may be withdrawn intermittently or continuously from the bottom of the chamber 1 through either or both of the lines 2. The withdrawal of the non-vaporized oil from the chamber may be controlled to maintain any level in chamber 1, but 1 preferably regulate such withdrawal so that a very low level is maintained, for instance, about a foot of oil maintained in the bottom of chamber 1 above the lowermost point.

The vapors separated in the chamber 1 are withdrawn therefrom through a line 7, contro led by valve 8. The vapor draw-ofi line '2 may preferably extend into the inside of chamber 1 by means of an extension 7a, which terminates in the lower part of chamber 1 and near the verti cal axis thereof. The point of withdrawal of vapors from the chamber can be changed, according to the results desired and the conditions Oil of operation, by changing the length of the extension line 7a. An auxiliary vapor line '7, controlled by valve 8, may be provided.

Referring particularly to Figs. 1 and 3, a flange 9 may be threadedly mounted upon the end or the transfer line 6 within the chamber 1. A plurality of bolts 10 are provided to fasten a blind flange 11 to the flange 9, there being a spaced relation between the two flanges, dependent upon the diameter of the chamber 1 and the pressure and quantity of fluid passing through the line 6. Positioned between the two flanges 9 and 11 are a plurality of vanes 12 disposed substantially spirally in a plane at right-angles to the flow of the fluid in the pipe 6. It is apparent that fluid passing through the pipe 6 under pressure will be directed outwardly by the blades 12 at an angle other than 90 to the periphery of the flanges and hence will be directed toward the walls of the chamber 1 at an angle thereto other than 90. Hence, all parts of the wall of the chamber 1 will be sprayed by the fluid, and the strips of carbon aforementioned will be eliminated.

Although the embodiment of this invention is shown and described in connection with a reaction chamber, it is not to be understood that I wish to be limited by this specific showing, since various situations exist wherein a device of this character may be used.

My invention, in addition to efliciently performing its function, is characterized by the ease with which it may be assembled and disassembled. This feature is particularly important, in view of the fact that it is subject to coke deposition and must be accessible for cleaning purposes.

It may also be mentioned that the space between the flanges may be varied by varying the depth of the vanes, and if desired the device may be constructed as a unitary structure, by welding the vanes to the flanges, thereby eliminating the use of the retaining bolts.

I claim as my invention:

1, In combination with a vapor separating chamber of an oil cracking system, a hot oil inlet pipe extending into and terminating adjacent the upper portion of said chamber, a non-rotatable flange fixed to the end of said pipe, an imperforate baffle beneath, spaced from and fixed'to said flange, vanes between said flange and bafile and disposed substantially spirally in a plane at right angles to the direction of flow of oil through said inlet pipe, a residual oil outlet adjacent the lower portion of said chamber, and means for separately removing vapors from said chamber.

2. In combination with a vapor separating chamber of an oil cracking system, a hot oil inlet pipe extending into and terminating adjacent the upper portion of said chamber, a non-rotatable flange fixed to the end of said pipe, an imperforate bafiie beneath, spaced from and fixed to said flange, vanes between said flange and baflie and disposed substantially spirally in a plane at right angles to the direction of flow of oil through said inlet pipe, a residual oil outlet adjacent the lower portion of said chamber, a vapor outlet pipe for said chamber terminating adjacent the lower portion thereof.

8. In combination with a vapor separating chamber of an oil cracking system, a hot oil inlet pipe extending into and terminating adjacent the upper portion of said chamber, a non-rotatable flange fixed to the end of said pipe, an imperiorate baiiie beneath, spaced from and flxed to said flange, vanes between said flange and bafile and disposed substantially spirally in a plane at right angles to the direction of flow of oil through said inlet pipe, a residual oil outlet adjacent the lower portion of said chamber, a vapor outlet pipe for said chamber terminating adjacent the lower portion thereof, and an auxiliary vapor outlet pipe communicating with the upper portion of said chamber.

4. In combination with an enlarged reaction chamber of an oil cracking system, a hot oil inlet pipe extending downwardly into and terminating adjacent the upper portion of said chamber, a non-rotatable flange fixed to the end of said pipe, an imperforate bafiie beneath, spaced from and fixed to said flange, said flange and baiile being disposed substantially at right angles to the direction of discharge or" oil from said pipe, means between said flange and bafile for imparting a swirling motion to the hot oil discharging from said inlet pipe, and means for removing vapors and residual oil from the chamber.

5. In combination with an enlarged reaction chamber of an oil cracking system, a hot oil inlet pipe extending downwardly into and terminating adjacent the upper portion of said chamber, a non-rotatable flange fixed to the end of said pipe, an imperforate baflle, bolts extending through said flange and baiile and securing the flange and baifle together in spaced parallel relation, said flange and baflle being disposed substantially at right angles to the direction of discharge of oil from said pipe, means between said flange and battle for imparting a swirling motion to the hot oil discharging from said inlet pipe, and means for removing vapors and residual oil from the chamber.

6. In combination with an enlarged reaction chamber of an oil cracking system, a hot oil inlet pipe extending downwardly into and terminating adjacent the upper portion of said chamber, a flange secured to said pipe adjacent the end thereof, an imperforate baffle beneath and spaced from said flange, said flange and battle being disposed substantially at right angles to the direction of discharge of oil from said pipe, non-rotatable means associated with said flange and baflle for imparting a swirling motion to the hot oil discharging from said pipe, and means for removing vapors and residue from the chamber.

JAN VAN DER WERF.

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