US1952860A

US1952860A - Vaporizing device for liquefied gases

Info

Publication number: US1952860A
Application number: US659191A
Authority: US
Inventors: Hansen Odd Arnold
Original assignee: Linde Air Products Co
Current assignee: Linde Air Products Co
Priority date: 1933-03-01
Filing date: 1933-03-01
Publication date: 1934-03-27
Anticipated expiration: 1951-03-27
Also published as: GB410068A

Description

March 27, 1934. o. A. HANSEN VAPORIZING' DEVICE FOR LIQUEFIED GASES Filed March 1, 1933 INVENTOR 'ing device of the convection type for liquid 0 obvious and will in part appear herei Patented Mar 27, 1934 tr e nesaccc VrlPilRli'ZdNG iron cases,

Odd Arnold sen, Buffalo, It, "21 to The Linde Products Company, New it N. "ill, a oi? @hio Application March 31, 119353, No 659,191

izing liquid oxygen discharged from a container,

in a manner which reduces operating hazards while the temperature of the oxygen heating parts is substantially at the temperature of the atmosphere, thereby reducing heat leakage to the atmosphere.

It is a further object toprovide a device for heating liquid oxygen by convection in which. the heat supplying means is relatively distant from the oxygen heating coil and is arranged to eh ect circulation of the heat conveying medium in counter-current fashion over the oxygen heating coil, whereby a relatively uniform temperature difference is maintained along such coil.

It is a still further object to provide a va oriz heating systems which employs air as the conveying medium and is constructed to 7 against undue variation in the thermal ch teristics of the medium, such as the specific capacity and thermal conductivity of the me @ther objects of the invention will i i The invention accordingly comprises tures of construction, combination of and arrangement of parts, which will e i lied in the construction hereinafter set the scope of the application of which cated in the claims.

For a fuller understanding of the nature objects of the invention, reference should nacl to the following detailed description taken in con= nection with the accompanying drawing in which: I

Fig. l is a view mainly in elevation showing a container for liquid oxygen having connected thereto a vaporizing device constructed in accordance with the invention;

Fig. 2 is an enlarged vertical section of the vaporizing device taken on the line 2-2 of Fig. l and Fig. 3 is a fragmentary view mainly in elevation, parts being broken away showing further lhel details n the construction of the vaporizing de= vice shown in Referring now to the drawing and particularly to Fig. 1, 1c denotes generally a container for liquefied gas, that shown being of the insulated type, such as is employed for supplying liquid oxygen for industrial consumption. The con= tainer stands on a suitable foundation and is provided with a liquid discharge conduit 11 leading from a control panel 12 on the container to a vaporizing device, shown generally at a.

The vaporizing device here employed is adapt ed to supply a relatively large quantity oi heat to the liquid withdrawn from the container, since it is desired not only to cause the liquefied gas to change from the liquid phase into the vapor phase so that the temperature of its vapor phase will be increased a substantial amount above the boiling point of the liquefied gas, but also in a manner that substantially insures against over-e heating the parts. To this end, the vaporizing device comprises a substantially closed chamber in which a heat supplying means is located at a distance from a heat absorbing means through which the liquid oxygen passes, the heat being transferred by convection from the supply means to the absorbing r ans through a suitable heat conveying inedi' such as air. in order that this air may not i" ve its thermal characteristics adversely affects Icy intermittent operation of would cause expansions and the vaporizing device is -ea hing device 18, which af- "catien between the circulating e cuter atmosphere and extracts entering air, whereby sub e circulates in the" chain evice may be oi any suite, that shown in the co- L. Dana and ll.

Z'Zenner, ,269, where a. depending champs open t e lower end, contains a l'llOiS- ture extracting a it, such as calcium chloride, and communicates at the upper end with the chamber to be supplied with dry air; communication here being provided by way of the con nection shown at it.

The oxygen thus heated passes from the vapor izing device a manner such that it will not unduly cool operating parts subsequently traversed, for example, aregulating device, shown conventionally at i l, interposed in the consumers pipe line 15. While it is customary to in terpose regulating devices which maintain a desired delivery pressure in the consumers pipe line, as here shown, it is desired that this regulating, device shall be at no time so low a temperature as to impede the proper functioning or the parts. The use of such devices, however, comprises no part of the present invention, but is shown here merely as exemplary of an oper= ating device which is protected against undesired temperatures.

The construction of a preferred form of vaporing device, depicted somewhat symbolically in g. l, is shown more in detail Figs. 2 and 3. Z-lere, a casing is employed. which is preferably c" e double walled variety and has heat insula on nterposed. Witl dn this casing is dis posed .nsverse barrier it, which does not duite e tend to the bottom oi the casing and stops sho t of the thereof. in this manner, a circulation passage is provided about the bar rier in the heat conveyi" inediurn ch-culates in ascending and descending currents.

The means for supplying heat may be of any convenient torn: and character, but is preferably electric heating means 18, which is here shown as corn rising a plurality of superposed banks of electric heating elements in which the heating elements are directly exposed to the Each of these banks as seen from 8 comprises a pair or rod-like horizontal insulating supports 20 and so which support a plurality of turns 19 of a resistance. These turns or elements may be connected elect 'cally in any suitable manner adapted to supply SllflCiGll'b electric current to accomplish the desired heating effect. The means for supplying the heating current to the heating elements oi the vaporizer a is shown genorally at 21 in Fig. l and include an electric con trol panel 22.

Heat absorbing rneans, traversed by the gas material to be disposed in the casing. {Elie heat absorbing means here shown comprises plurality of coils 23 connected to be traversed by the gas material successively which are provided with heat conducting fins 24 that divide the circulating medium into small streams and quickly conduct the abstracted heat to the material within the coils 23. The inlet oi the coils'is connectedto the conduit 11 at a point in a relatively cold portion of the descending current of circulating medium, while the discharge conduit 15 is connected' to the coils at a point which is in a relatively warm portion of the descending current of circulating medium. By this arrangement, it is seen that the coils employ the counter-current method or" heating the gas material traversing the same and insure a relatively uniform difference along the coils between the temperature within the coils and that of the adjacent medium on the exterior of the same. The coils 23, while they may be in general located anywhere in the path of the circulating medium, are preferably disposed in a region which is at some dis-= tance from the heat radiating means 18. Accordingly, the coils 23 and means 18 are shown on the opposite side of the barrier 17, the means 18 being disposed at the beginning of an ascending current of circulating medium whilecoils 23 are at the beginning of a descending current.

In operation, withdrawn from the container 10 through the conduit 11 and passed to the heat absorbing coils in the vaporizer c. Here, the coils are subject to the heating influence of the circulating medium and abstract quickly the heat therefrom as pointed out above. It is seen that by reason resistance type of electric heater, it is conteinll eated and vaporized, are also it is seen that gas material is of the vertical arrangement of the heat radiating means and heat absorbing means and by their disposition on opposite sides of the barrier 17, a rapid circulation of this medium is effected,

since it is quickly cooled by the heat absorbing 89 coils and passed to the lower end ofthe casing a, where it is again heated by the heat radiating means 18 and caused to rise under the influence of the field of gravity. The casing a being substantially closed, permits no ingress of atinosperature for the heat tran age from the system. is red a relatively small amount.

While the heating means here described is a plated that other types oi elect'ic heaters also be employed, for example, induction hea s Where induction heaters are employed, the ducing winding may, with advail ge, be so'placed as to induce the heating current directly in the coils of the heat absorbin means.

Since certain changes maybe made in above construction and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter 1 contained the above descri tion or shown the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Having described my invention, what I. c m as new and desire to secure Letters 1: ent, is:

l. in a vaporizing device for liquefied gas, the combination comprising a substantially closed casing havingan unimpeded circuitous passage therein about which a gaseous heat conveying medium is circulated by convection, a heat ab sorbing means adapted to be traversed by the gas material to be elevated in temperature disposed. in one portion of said passage, means for heating said medium disposed in said passage in a position relative to said heat absorbing means such as to induce convection under the influence of gravity.

2. In a vaporizing device for liquefied gases,- the combination comprising a substantially closed casing, having an independent barrier stopping short of its upper and lower ends about which barrier air is adapted to circulate freely, heat absorbing means including a coil traversed by the gas material to be elevated in temperature disposed on one side of said barrier, and heat radiating means disposed in said casing on the other side of said barrier and at such a distancefrom said heat absorbing means as to induce circulation of said air under the influence of gravity.

3. In a vaporizing device for liquid oxygen, the combination comprising a substantially closed insulating casing having a barrier disposed in a substantially vertical plane extending across said casing but stopping short thereof at its upper and lower ends about which barrier air is adapted to circulate, heat absorbing means including a coil traversed by the oxygen to be elevated in temperature disposed in said casing on one side of said barrier adjacent the upper end, and heat radiat- 150 ing means disposed in said casing on the other side of said barrier adjacent the lower end.

4. In a vaporizing device for liquid oxygen, the combination comprising a substantially closed insulating casing having a barrier stopping short I of its upper and lower ends and positioned to form a passage of relatively uniform cross-sectional area through which air is adapted to cir= culate, heat absorbing means including a plurality of coils arranged to be traversed successively by the oxygen to be elevated in temperature disposed in said casing with the inlet in a relatively cold portion of the circulation passage and the outlet in a relatively warm portion of said circulating passage, and electric heating elements disposed in said casing on the other side of said barrier substantially below said heating coils.

v 5. In a vaporizing device for liquid oxygen, the combination comprising a substantially closed in-= sulating casing, a barrier disposed in a substantially vertical plane extending across said casing but stopping short thereof at its upper and lower ends, means for admitting dehydrated air from the atmosphere to said casing for circulation as a heat conveying medium about said barrier, a heat absorbing means including a plurality of tubular coils arranged to be traversed by the oxygen to be elevated in temperature flowing in succession therethrough and disposed in said casing on one side of said barrier adjacent its upper end, an inlet connection for said coils leading to the substantially lowest point thereof, an outlet connection for said coils leading from the substantially highest point thereof, and electric heating means disposed in said casing on the other side of said barrier adjacent the lower end thereof.

ODD ARNOLD HANSEN.