JPS6073286A - Operation method on starting of air separator - 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 The present invention relates to an operating method at the time of starting up an air separation apparatus M, and particularly relates to an operation method at the time of starting up which can shorten the redundant operation state (IJ4 during cooling to a low temperature) from room temperature at the time of starting up. Regarding the method.

Air separation equipment compresses, cools, and liquefies air in order to obtain carbon dioxide, nitrogen, argon, etc. from the air, and separates oxygen, nitrogen, or argon by means of a sieve.

The operating method at the time of start-up, which cools the air separation device from normal temperature to the extremely low temperature that corresponds to one-time operation, will be explained with reference to FIG. First, air is compressed by the raw air compressor 2, and the resulting compressed air is sent to the heat exchanger 4, where it receives oxygen from the stacking tower 6,
While being cooled with a cooling gas such as nitrogen, moisture and C in the air are removed.
(After impurities such as J2 are removed, most of it is sent to the lower part 8 of the column column, where it is crudely collected and stored in the lower part 8 of the M1 column as liquid air with an O7 concentration of about 48%. The pure oxygen 11y liquid air in the crude storage tank is reduced in pressure to approximately 0.5 kg/i by the pressure reducing valve J2 installed in the connecting pipe 10 and transferred to AI.
The upper part 14 of the V-reservoir tower is installed. The liquid air is further stacked in the stacking tower 6 and sent to the outside of the system separately for oxygen and nitrogen. A part of the accumulated oxygen is stored in the condenser 16 as liquid oxygen.

When the air separation device α is cooled to body temperature, and the storage of liquid oxygen in the condenser 16 reaches a certain level, startup is completed and the production of liquid oxygen as a product can begin for the first time.

The liquid oxygen in the condenser 16 is circulated by operating the liquid acid circulation horn 20, opening the valves 22 and 24 and closing the valve 26, and removing impurities such as hydrocarbons in the liquid acid lacrimator 28.

Next, the liquid oxygen in the condenser 16 is removed by opening the valve 26, closing the valve 24, and operating the liquid acid circulation pump 2o.
The liquid acid tank 34 ((J) is sent via the piping 30 and the valve 32, and the pressure pump 36 is operated as required, and the liquid is transferred to the liquid single-throw tank truck 38 or the liquid acid vaporizer 39.
The user outside the thread is vaporized ((sent. Also, 1゛I)
The oxygen extracted in the trapping tower 6 and the gas in the window are sent to the heat exchanger 4H4 via a pipe 40, mixed with compressed gas at A%, and sent to users outside the system.

However, in the above conventional startup method, the condenser I
1i4 for long time storage of liquid oxygen up to 1v level of 6
It required J, and the power consumption was so large that it was 7 f compared to 1 ha J alliance.

Also, I was at 1.9 to drive the emergency equipment in the event of a breakdown, and I was at 5? ”
In order to prevent failure, Pre-II) η device i! ]', there was a desire to reduce the start-up operation and quickly transition to steady operation.

The purpose of non-invention is to overcome the above prior art;! '4 points) −jγ
We would like to provide an operating method for starting the air separation device f'r that can shorten the startup time.

The gist of the present invention is as follows.

That is, in the 11 distillation column, liquid oxygen is supplied to the air separation device ji which separates oxygen from the air (in the operating method at startup, the air valve 1η1r device is activated to cool the stacking column in advance) This is an operating method for starting up an air separation device, characterized by injecting.

In other words, even in the unexploded one-blade method, in the same way as before,
C valley! The raw material nitrogen compressor 2 is started and the air separation device is cooled using the heat exchanger 4 and the expansion turbine 8. However, in the present invention, most of the liquid oxygen stored in the condenser 16 is 3. Inject the prepared liquid Gin. As a result, the liquid acid system injected has a moose 6": 7? ?
By Tsubame, the total air flow is F4t, and the normal rotation time of the device (dwarf cooling is promoted and started) is compressed.A liquid acid system made by Ia is injected. If the liquid acid system starts to accumulate, it may not be cooled sufficiently, and the liquid acid system may evaporate and expand rapidly due to the sudden temperature difference between the liquid acid system and the handrail. This is because the pressure inside the condenser 16 rises abnormally and there is no increase in the pressure on the floor of the installation 11a.

A detailed explanation will be given below using 11 actual examples.

There are three systems, each with the following specifications.
In! Explain about I.

Raw material air compressor J) lfl, lfb force I JtJ 0
0 KW Oxygen generation valley amount 25000 Nr+il/H1
While the oxygen flants of system and system 2 were being operated, the oxygen plant of system 3 was started up while the oxygen plant of system 3 was inactive.
When the 2nd system was suspended, the start-up of the 3rd line plant was carried out using the method of the present invention.

First, we started operating the 3-thread oxygen flant air separation device in the same manner as before, and put 1 wave of liquid into the air valve R't [(when the limbs were cooled) ?'&(
When the liquid level 11"41 was detected, the valves were opened and closed as shown below. Gradually open the liquid acid tank 34 to remove the liquid acid system from the liquid acid tank 34.
-1 YubA A constant force J: iJ,: was applied to the condenser 16 via J1 No. 28.

Planar W valve 48,50.26.24rjI state valve 46.32.22 In the condenser 16, cooling of the upper tower 6 is promoted by the instant heat and latent heat of the injected liquid acid system, and the steady operation condition iQ As the temperature quickly reached a low temperature, the start-up operation was terminated, the supply of product oxygen was started, and the operation of the 2-line refrigeration plant was suspended.

Comparing the power required at 11 o'clock in the example with the conventional method,
i4% As shown in Figure 3, the conventional rise time was 70 o'clock (a), but it was 50 hours, and the time was shortened to o'i'fii. i I~j)1. I was able to save on swords.

/Yo・5, I realized that the nitrogen gas was cooling down and liquid 1) had started to accumulate in I6.
Implementation of l, I, uniformly 'C1,'IdiGi,'ll
In δ sacrilege IG? Please check the leakage every time -18,3C
You can also start the injection of liquid at the moment when the liquid to be injected...
is liquid r1. If there is no liquid in the b tank 34, the liquid will be transferred to the tank n-li 38; ] In this case, liquid acid can be injected into 6.
Since impurities such as hydrocarbons are removed in the J-I filter 28, it is also possible to use liquid oxygen produced in other equipment.

The present invention can be seen from the above embodiment as shown in ψJ. Gas separation device by injecting liquid oxygen ■15
In addition to shortening the start-up time of the first engine and reducing the consumed TIE power, the transition to steady operation of the standby engine at 1:00 a.m. hastened and the effect of preventing oxygen shortages has been achieved.

[Brief explanation of the drawing]

Figure 1 is a process diagram showing an example of the present invention, No. 21 is a system diagram of an enzyme blunt in an example of the present invention, and Figure 3 is the air separation unit of the non-explosion method and the conventional method - rise time at startup. It is a diagram comparing power and electric power. 2... Raw material air compressor, 4... Heat exchanger, 6... Upper tower, 8... Top tower 1; IS, 12... Pressure reducing valve, 1
4...H'lj 7'J tower upper part, 16...Condenser, 1
8... Expansion turbine, 20-... Liquid acid circulation pump, 2
8...Liquid ecJa device, 34...Liquid acid tank.

Claims (1)

[Claims] (1) In the method of operating an air separation device for separating oxygen from air in a stacking tower, the air separation device f;
1. An operating method for starting an air separation device, which comprises starting an ffi to cool a stacking tower in advance, and then injecting liquid oxygen into the distillation tower.