JPS6038579A - Method of distilling air and air distiller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention relates to the distillation of air in a double lumbar field.

As is well known, the double column air distillation device π mainly consists of an intermediate pressure lumbar field operating at approximately 6 bar, a low pressure lumbar field operating at a pressure slightly higher than atmospheric pressure, and a condensing lumbar generator. configured. After purification, the air is sent to the bottom of the intermediate plant. “Thick liquid” received at the bottom of the intermediate factory
(oxygen-enriched air) is refluxed to the midpoint of the low-pressure column, forming an almost entirely solid intermediate plant, J54F.
! The "dilute liquid" received at
:; is refluxed to.

Below the inlet of the thick liquid, there is an ``argon extraction section'' that generates argon under low pressure.
include. Low-pressure columns usually have sump passages at the bottom for drawing out gaseous nitrogen and liquid sulfur, while intermediate plants usually have sump passages at the top for drawing gaseous nitrogen and liquid sulfur. Top natural gas (“impure nitrogen”) is formed by nitrogen containing a small amount of oxygen (λ ~ 3, be done.

In systems where gases are supplied directly to the user through piping, a temporary excess of oxygen may occur (particularly when Occurs during periods when the user's plant is shut down. In the seven-way waist device, the gas is then connected to the atmosphere and the energy expended in separating this oxygen is lost.

The purpose of this invention is to replace the temporary reduction in oxygen demand with one or more of the other products of the device, namely argon,
One or more of liquid r) lambda, liquid nitrogen, or gaseous nitrogen may be used to increase the volume.

Therefore, according to this issue, an i+/a,x reservoir operated at a relatively high pressure and referred to as a medium pressure column;
In a method of discharging air by means of a double column, consisting of a first and a second distillation column operated at relatively low pressure and called a low pressure column, the uLl distillation column is taken from one of the second distillation columns. The liquid is sent to the section of the auxiliary column operating substantially at the pressure of the LP column, and the gas taken from the LP column, which is less oxygen-rich than the liquid, is transferred to the auxiliary column section of the auxiliary column. The cool air sent to the bottom = IS and received at the base of the auxiliary air is substantially fj at the extraction level of the gas, which is low IE.
A method is provided, comprising refluxing the column.

"Auxiliary abbreviation" is intended to mean a tower having the structure of a lumbar pain field, ie a tower with a number of plates that constitute the filling material of the type used for lumbar pain.

This origin] is also a double informal air &′? for carrying out this method. , provides Ii courage. 17A ft (column, operated at a relatively low pressure and referred to as low pressure +:)r, operated at a relatively high pressure and referred to as intermediate pressure "is"; , g
lX/In the heat exchanger with i9ki in the distillation tower back pain area”,
A heat exchanger that evaporates, and sum! ,,2 Mokudameto (q
This type of device consisting of means for achieving reflux at Lower back pain field and mortar N, 24' = '(Liquid taken from one side of the reservoir is supplied from above, and +) iJ liquid ((
, Yoshi also 7i' from the low pressure tower where the dark purple is not dense, :raiL
'/C (the body is offered from below and is received at the base of 1JiJ on the strings or at the base of the above-mentioned support, 11
If, for the purpose, it is necessary to have means for sending said gas to the low pressure tB at the level of withdrawal of said gas, I! ') f fl.

The largest moving vehicle will be supplied to the auxiliary tower! When +K V is liquid oxygen received at the bottom of the low pressure column and Fii] gas is O1J at the top of the low pressure column;
In a particularly simple embodiment according to the invention, the auxiliary column is provided at the top of the column by means of a section 11 of the column.
(・＞ will be accomplished.

Hereinafter, the invention will be explained with reference to the drawings.

The lower back pain illustrated in Figure 1 is lower 7. . The structure consists of a medium filtration EIE column, an upper distillation column or low pressure column, and an 'lr'A Jet evaporator 3 between these one column. The air to be vaporized (purely heated) is mixed with the bottom liquid 5 which extends over the V-cord, which is called a thick spherule.
h') is injected through a passageway at the bottom of the column at a pressure of 2 bar, so as to stop the overhead vapor consisting almost entirely of nitrogen.

This top steam can be partially withdrawn through the passage 6, and the remaining steam can be drawn out as soon as θ2 in the vessel 3.
i, and is accommodated in the gutter 7 at the top H1i of Jru/. Is the part of this liquid that is given ←R outside the auxiliary space a cubic meter? It is expanded to a crystalline pressure slightly above atmospheric pressure, and is injected into the tower in the form of several bodies, and flows from this tower as reflux, and the dilute liquid of the liquid. The debris overflows from the gutter 7 and flows through θ1[4.

A portion of the thick liquid rises along the path and is expanded in a valve 7.2 provided in this channel, causing the injection of liquid into the liquid. It is injected into the tower in liquid form below. thick lik
The remains of the body were carried through the passageway 1't'i/i A to the top stone 1 of the argon generator filter tower (not shown), and this G, L: #il, It evaporates in the vessel/After this, a wave of ωh17 appears in the circular part of the tower λ1.
::, for example -~3 plates below, sent to jl:i, 2 at l/B.

In the tower ΩtJ, the thick shield A4, at the supply level and the lower level, respectively, has a through hole that warps toward the argon generation grid, and the gas 6'I Passage 15 for drawing out the element, and U., and the tower from the analysis of the tower, also C
j, z: 1d, 1e for the song b'i+/6 to bring out the element, and 011e for the can. 2 to 3 reward ridge bars, ke battle 3
The first distillate 11 consisting of one element (impure nitrogen)
・can be discharged through the passages /7 located in Ukiichi at the same level as the injection level of the liquid.

From the tower, which can be considered to be visible at the upper end of the passageway/7 level, there is a small diameter tower area 1 of 41.
g extends upward, and this Ri! The i part communicates with the tower. , "+ A area/g corresponds to a small number of theoretical plates of the same type as used for the hot surface, for example 6 theoretical plates 1. The plate size C includes the filler. Rise, ] r Passage /9 with pumpco θ f + iii extends from the base 1- of column l and reaches the top of this IX area /g. In this case, there is a passage 2/p for discharging the steam at the top of this area, which carries the residual gas 11.
I can get angry.

In the regular operation Q, 'II, the pump lθ is not turned 51. Is the required amount of gas and liquid available through the passage? The impure nitrogen is drawn out through 2 through 1O, 5 and 2, and the impure nitrogen is: 411%. Depending on the size, the liquid is discharged through either the passageway/liss and the passageway λ or 7.

The reflux is a rare occurrence at the top of the tower: j'j i, '3
The rise of ('c) is achieved only by

For example, there may be an excess of gaseous oxygen for a limited period of time 0 due to the temporary shutdown of a consuming factory directly connected to the passageway /S by an arrangement Il''S. Thou u,',i,-++4-equal flow,B
1 of liquid acid (11',) / 9; ji3 and the upper row of pumps, 20 liters, and 1 ml of anchors were added, and the valves of the passages /S were closed in a corresponding manner; The force of ``h'lJ/'' and ``2'' is activated in such a way that the area /g is struck by the impure emotion of the dawn.

Therefore, the foam m+, '3:+'+ at about -7δ゛0℃ is
An additional area of 1 g is poured into the upper plate, and the lower plate of this region/g undergoes a humid exchange at about -7? .As a result, the element traces back to the place carrying oxygen on its back, 2.
/ is piled up and discharged at fi4', I-/qO℃, ``still a slight chi□ (2~, 1 odor) to 1・f1% (
Contains ~3%) of oxygen! ? The liquid f4 of about -/9.4'C descends below the area/g from the bottom to the left Z].

The minimum amount of impure liquid to wait for the dispersion content 4'j'i'f-, which is suitable for achieving the level of injection of ``flat angle'' of this liquid. b′11 amount δ1y? All you have to do is wear one.

Overall, at the bottom of the column λ, the gas withdrawal is replaced by a liquid withdrawal, which increases the heating of this column and, at the level of the thin liquid injection, adds to this liquid an additional flow of reflux liquid. are superimposed, so that the means of achieving reflux at the top of the column are formed by the dilute liquid upper shell 1 and the additional area 7g.

In other words, both the reflux RL/V at the top of the column and the inverse of this ratio at the bottom of the column increase. Therefore, the efficiency of low back pain in the introduction is improved, and this improvement is
It can be used to increase the argon extraction yield by 1Klf. For example, this input is separated by 0 through passage 19.
By recirculating the i element's g5 mass, it is possible to increase the gO mass from 70 chi.

Furthermore, considering the section of the column located at the level of passage 17, i.e. directly below the addition section 1g, the addition section produces an impure nitrogen stream at about -796°C equal to the recirculated liquid oxygen stream. It has been found to have an overall liquefying effect, which is achieved with liquid oxygen at about -igo<0>C. Zone tg thus achieves a heat pump-type cooling transition, which results from the energy released by the near-reversible mixing of oxygen and nitrogen in this zone.

This cooling transition can also be used to increase the production of other devices with.

The withdrawal of gaseous nitrogen at intermediate pressure through one passage 6 can be increased. In practice, this means that the amount of heat condensed and therefore the heating of liquid oxygen can be abbreviated to low I', which involves evaporation at the bottom of the column and dilute liquid at the top of this column for heat dissipation. This undesirable phenomenon is caused by the effect of the above-mentioned area on the sleeve (7'
I can do it.

- The gaseous ions thus drawn off can be used as such or expanded, for example in a turbine (not shown), by means of which the device is arranged to produce cold air. This then allows for an increase in the production of liquid (nitrogen or f1':<element) of the device.

Liquid production in a unit can be increased in another way in a unit employing air blowing in a low pressure column by increasing the flow of air blown by a turbine. This is because the heating of the low pressure column and the EL
As mentioned above, the reduction of IJM, area/g
This is because it can be compensated for by the effect of

Of course, in the case described above, the yield of argon extraction increases only slightly, or returns to the value it would have had the zone ig not been present.

Figure 2 shows how the M carp of this invention is used in a "minaret" J type (i.e., type that produces pure nitrogen at low pressure by backing of impure nitrogen at the top of a low pressure column) device. In this figure, various extraction passages are omitted for clarity, and absorbers corresponding to the 122 elements in the m1 diagram are indicated by the same reference numerals.

Thus, intermediate pressure loss 11 low pressure tower, condensate m
There are provided two valves //A and //B1, an argon connection 13 and an argon connection 13, a passageway associated with the condenser at the top of the argon generating group //A and //B1, and a passageway 17 for discharging impure nitrogen.

The double tower is equipped with 2.2 auxiliary towers called "minarets" which produce pure nitrogen at low pressure. This valley is traced from the lower blade y7. ．． : A/L with a3 accepted and 1
Nitrogen is supplied, and the RII thin liquid 7 taken from the top F11 of the mixture is passed through the passage 2 with a
q; IQ l.

is supplied from the upper blade. Pure? The number 5 is “H; a
.
sent to the department. Furthermore, as is usual in this type of apparatus, 11. ! Reflux at the top of each λ is also achieved by pegging the ``low dilute liquid'' through the passageway g through the relief valve 29.

The area 7g in Figure 1 is 1j' for the auxiliary tower/gA! This 1% is supplied from below through passage 3θ, and the liquid taken from the bottom of the column is supplied to the passage 18/d, equipped with a lift pump, 20. This i51gh is W, the area/g in Figure 1.
It operates in the same way as the nitrogen and oxygen gas mixture created at the top is discharged all the way through the collapsing channel and through the bottom. The run body of , enters the top of the introduction λ through passage 3 as a Cormi flow. /. Thus, in this f-Y configuration, the same advantages are obtained as in the seventh case.

Actually, it's a bit of a pox/,2. /gA and 2.2 can be made into -(,i, by twisting the tower's claws. Hidden,
ht, shown in Figure 7) J? Then, Jmu/&A turns around that of FIG. 1, and by constructing an area /g, the top of the tower ε'i! , 'A tower 22 of a smaller diameter than area ig is in communication with area/g, and its flanks are west of t! b: '+''.The details of this arrangement are obvious from F) 13 and above, so I do not want to explain them.

In order to make U+-ftV Tit+ ll'i,
Since i'i near and cog reach tower Ω M'-1, 6(]
When combined into a single passage 3.2 and/or injury, 7j:
It takes an eye.

In Kidado 1, 'b/g A is integrated into the outer shell of the anus + Hlj lever in the form of 1st area/gB, without communicating with Iko1, The bulge 22 communicates directly with the recess B of the lever at its base. Pure phonemes are supplied to the interview in towers i and gh (i.e. area/g).
Rather, it was in tower a2, and passages Ωg and 3- were combined at passage 3-, not 7i-road 27. (IA
The arrangement and operation of the construction are exactly the same. In the 9'lq diagram, the diameter of Fujieda/gB is equal to the force of Minare Sotoyu Ω. As a love type, this can be IJ, and the diameter of the minaret can be made as small as J.

), 1 go is 阜/,, 2. IgA and 0:2.
All of 2 can be made into a turning diameter, thus making a single circle W; ]
It can be integrated in a shaped outer shell.

ll Drawing 11-basez? ; Circumstance y] A' / (¥1 is with; Air n by lj+4:
(, Figure 9' of the two Mj towers of Tame 4 and Explosion β: 1 and 1, and Tani, 2) shows another J, jj, j = : 2 Mj tower according to this invention - Figure 9, ν3 and Trz) 4;

Figure αI(ni), /ke intermediate pressure i1i, 2kan low fJ:
#j1,? is a heat exchanger, 7g is 'j':i! I:, l
no ill, /q1zune 11; JM fi of assistant q agriculture 5.1
Send to l'>L! k! :';, 3θ assistance] me;
l:: +'+i'+ HeiX 7, Passage 2. ? l is "," and from the part to the pressure loss near 0 indicates e;13↓r1□1-
0Continued from page 10 Inventor Michel Lestrado France.

Chastret: Shucy en Brie, Lu des Boutiques 3

Claims (1)

[Claims] l A double column consisting of a first distillation column operated at a relatively high pressure and referred to as an intermediate pressure column, and a second distillation column operated at a relatively low pressure and referred to as a low pressure column. in a method of distilling air by directing a liquid taken from one of a first distillation column and a co-distillation column to the top of an auxiliary column operating substantially at the pressure of the lower pressure column, said liquid The gas taken from the low-pressure column, which is not very oxygen-rich, is sent to the base of the auxiliary column, and the liquid received at the base of the auxiliary column is treated as reflux to the actual T↓01'' recording body. At the extraction level,
A method characterized in that it is sent to a low pressure column. 7. The method of claim 7, wherein the liquid is taken from a low pressure column. 3. The method according to claim I1 [1], wherein the liquid taken from the low pressure column is liquid oxygen taken from the bottom of the low pressure column. The method of claim 1, wherein the gas is the gas at the top of a low pressure column. 3. A first distillation column operated at a relatively high pressure and referred to as a medium pressure column; a second distillation column operated at a relatively low pressure and referred to as a low pressure column; liquid oxygen received at the bottom of the low pressure column is transferred to the first distillation column;
To ensure reflux in an air distillation apparatus equipped with a double column, consisting of a heat exchanger for evaporation by heat exchange with steam at the top of the distillation column, and means for ensuring reflux in the second and second distillation columns. iiJ means for directing liquid taken from one of the auxiliary column, the first distillation column and the co-distillation column, operating substantially at the pressure of the low pressure column, to the top of said auxiliary column; means for conveying the gas taken from the low-pressure column, which is not particularly rich in oxygen to the liquid, to the bottom of said auxiliary column, and for refluxing the liquid received at the base of said auxiliary column. An air distillation apparatus characterized in that it consists essentially of means for feeding said low-pressure column at the level of removal of the recording body. M. An air lumbar system as described in Section 5 of Revision 51-1, in which the liquid sent to the auxiliary column is taken from the low-pressure column. 7. The air thermal distillation apparatus of claim 6, wherein the liquid sent to the auxiliary column is liquid oxygen received at the bottom of the low pressure column. and The air lower back pain drinker according to claim 5, wherein the gas is steam at the top of a low pressure column. 9. Air back pain 1L according to claim 5, wherein the auxiliary tower is an additional tower section provided at the top of the low pressure tower.