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Патент USA US2107797

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Feb.v8, 1938.
I ,
Filed Oct. 17, 1936
Aab‘lf'lyesser ~
Patented .
V8, 71938 _
‘ 2.107.791
2,101,191 .
Arrmrus roa raonuomo. ANDs'roRQ
ING oxronn
_ Adolf Mam, Frankfort-on-the-Main,’ Gem -
October'- 17', 1936, Serial No.'106,165 ,
Germany September 4, 1936
2 Claims. 7 (c1. 62,-122). ’
In certain types of air separating plants for the
production of oxygen and nitrogen, the liquid
‘oxygen producedkand ‘collected in‘ the recti?ca
tion column is forced out by a low pressure, for
5 ‘instance about 0.5 atm_., into the oxygen evapo- ‘ rating coil onv the low pressure side oi the 'ap—
- paratus where the liquid oxygen is evaporated.
The warmer or outlet end ofqthe oxygen evap
orating coil is'generally connected to a gas hold-v ’
'10 er of the ?oating bell type where the oxygen ac
holder for receiving the evaporated oxygen. An
adjustable regulating valve in the piping between
the oxygen evaporator coil and the storage hold
"er, regulates the amount of vaporization of the
liquid oxygen and effects the storing of the gase-
j , In the accompanying drawing there is shown
for. the purpose of illustration, an apparatus
cumulates and ~from which it is withdrawn-and
compressed for storage at a high’ pressure. _
‘In many cases, especially where the oxygen
isproduced at‘ the, plant vwhere it is to be con-,
‘\15 sumed, a pressure of only about 10 atm. is‘ re
quired, so that any compressing of the oxygen to
5 _
ous oxygen in the holder at the desired pressure.
I any higher degree, entailslun'ne'cessary expenses.
which embodies the present in?ntion and which
may be'used to carry out myimproved process.
In this drawing there is shown a column in
having a heat interchanger vi i; at the upper end
for precooling the incoming air, andv a rectifying
section l2 at the lower end for separating the air
into oxygen and nitrogen. The air is introduced 16
under pressure through a coil 13 ‘of the inter
changer | l in countercurrent heat interchange
relationship with the‘coil ll ‘through which they
evaporation of the separated liquid oxygen takes
. An oxygen producing ‘plant’ suitablev for such
oxygen users has been so well developed that even
0 an intermittent ‘operation. of the ‘plant is eco-' ‘ place. This precooled air, after leaving the'heat
nomical vand the accumulation of very large interchanger ll, passes through a coil ii at the
bottom of the rectifying section where‘the sep
, quantities of. ‘oxygen in order to insure a cone
arated liquid oxygen collects,-and then through
.stantv supply'is not necessary.
’ i ' '
One object of the-present invention is to pro-~ ' an expansion valve It to a nozzle disposed over
25 vide 'a process and apparatus for separating oxy
a series of trays i8.
' gen from airand storing ‘said oxygen at a suit
» ; able pressure "for use without further compress
over the trays II, the nitrogen gas passes up- -
ing ‘or the provision for‘very high pressure stor
30 4 In carrying, out thepresent invention,yI pro
'vide, one or more liquid oxygen receivers which
are advantageously directly connected with the
bottom of the recti?cation column to receive the
As the resulting liquid air trinkles downwardly
v'wardly'around the'heat. interchanger II and out
through an outlet 20 while the oxygen collects
in liquid form at the bottom 01 the column.
As a feature of the present invention, the liq
uid oxygen collected at the bottom of the column
III is gradually withdrawn 'and'temporarily stored
_in a receiver before passing through the heat in
35 vceiver'has been ?lled'to a predetermined level, terchanger coil ll. ‘As shown, a pipe 24 is con- 35
. the liquid-oxygen‘ supply thereto is shut oif and nected to the bottom of the column l0 and has a
the stored oxygen‘ isforcedthrough the oxygen pair of branch outlets 25 and 26 extending into I
evaporating coils forming part of the heat inter; the tops'of two receivers 22 and 23, these branch
changer for precooling the incoming air._ The es being controlled byvalves 21 and 28.
Extending substantially from the ‘bottoms of
“very low temperature which exists in the ?lled
' , 7': liquid‘ oxygen from said column; After the ref
receiver normally inhibits rapid evaporation of
45' stance, the second ‘stage-of the aircompressor
may be utilized asvsuch pressure means.
‘Preferably more than one receiver is provided,.
andthe receivers ‘are ?lled and emptied alter
' . nately ‘so that while one receiver‘ is being filled,
the receivers 22 and 23 are outlet pipes 30 and .
3i forming branches of a pipe 32 connected to
.the liquid oxygen, and in carrying out the pres
ent invention, pressure is utilized for forcing out > the inlet end of the oxygen evaporating coil i4.
These outlet pipes are provided-with valves 33
the liquid oxygen from said receiver. For in
liquid oxygen, the liquid oxygen which has
[already been stored in the other receiver is
' ‘ forced by air pressure throughv the oxygen evap- .
-> crating coils‘. as already pointed out. I
- 'At the outlet or warmer end of the oxygen
evaporating coils,.there is provided a storage gas»
, and SI.
vMeans are provided for forcing‘the liquid from
either of the receivers 22 ‘and 23 through the
evaporating coil [4 of the heat interchanger ii.
Forqthis purpose there is provided a pipe 36.lead
ing from a suitable source ‘of pressure such as
the second stage of the air compressor, and hav
ing a‘ pair of branch connections 31 and 38 which
lead respectively into the upper ends of the re
ceivers 22 and 23, and controlled by valves 40
and ll.
'; 2,107,797
The outlet end of'the oxygen evaporating coil
umn at low pressure, and liquid oxygen continu
l4 leads to a storage holder 42, the connection ously evaporated and stored at a readily usable
between said coil and said holder being controlled vhigh pressure‘ without the use of ‘any additional
, by‘ an adjustable regulating ‘valve 43. . This hold
5 er ‘2 is provided with- a valved outlet 44 leading
to a' suitable point where the oxygen may be
; used in the workshop.v
_ pumping or compressing mechanism.
‘Having thus described my invention, what I
claim as new and desire to secure by Letters
Patent is:—-
As the oz-wgen is separated and collected in
1. An air separating apparatus including a
liquid form in the bottom of the column “I, it is , recti?cation column, a‘heat interchanger,- a liq-i
I 10 delivered to and from the receivers 22 and 23
uid oxygen receiver connected to the liquid oxy
, alternately. As shown ‘in the drawing, the valves gen collecting portion of said column, a delivery 10
' 21, 34 and“ are opened and the valves 28,, 33 pipe from said receiver to said heat interchanger,
and 40 are closed, so that the liquid oxygen is ., and means for forcing‘ air under pressure into
"being delivered through the valve 21 into the ~ said receiver to force the'liquid ‘oxygen therein
' 15 upper end of the receiver 22 while, the liquid ' through the heat interchanger.
. oxygen which has already been stored in the re
ceiver 23 is forced by the pressure in the pipe
36 through the valve 34 and into the evaporat
ing coll M. The evaporated oxygen leaving the
2_.' An air, separating apparatus including a
recti?cation column, a heat interchanger, a pair
01' liquid'oxygen receivers, valved means between
the bottom of said recti?cation column ‘and said
20‘0011 ll passes. into the storage holder 42 at a receivers ‘for delivering liquid oxygen from said
pressure depending on the adjustment of the column selectively to either one of said receivers,
valve’ 43. When theliquidreaches the desired
level in thereceiver as shown by the gauge glass
45 or by other suitable means, the valves are re
_ 25‘versed.
By reversing the valves at the proper
intervals, liquidoxygen may be continuously pro
duced and‘ continuously withdrawn from the col- I
valved means 'for delivering liquid oxygen from I
either one of said‘receivers through said heat
interchanger; and air pressure means for forcing ~
the liquid oxygen from either one of said receiv 25.
ers through said heatinterchanger. '
ADOLF' nmssna.
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