Henan Yuguang Gold & Lead Co., Ltd. Oxygen plant a set of
KDON26000 / 2000 / 180-type air separation plant air produced by the River, in
In October 2004 to begin the installation, testing by the end of January 2005, February 26
Sunrise of oxygen. Out of oxygen did not put into operation after the argon system, oxygen production has been reached
Less than 6000m3 / h, was due to liquid crude argon condenser air into the throttle off
Strictly and continuously transferred to the crude argon column cold, in the crude argon column at the bottom of the plot
Gather a lot of liquid argon and decided to put into operation the system.
Argon system put into operation, the crude argon tower is generally good,
But in essence argon column and put into operation a number of problems arising in the process.
1 Failure
Guide to the fine tower argon gas, refined argon column pressure PICA704 has been
Instability, volatility is very frequent, and no rules to follow, from the pressure
PICA704 emission control valve PCV704 sometimes full-closed, when
And fully open. The first order systems up and running and did not have any operating conditions
Under the conditions, PICA704 will suddenly rise. Even if the long-term full-PCV704
Open, still can not eliminate this phenomenon. Finally, PICA704 higher than the crude argon column
Pressure PICA703, craft argon flow FIC702 zero, resulting in rough
Decreased resistance PDI702 argon column, refined argon column had to stop working.
After another 10 minutes later, refined argon column pressure exerted by the sharp decline in the resistance
A sudden rise, until the pressure has become a negative pressure, process argon flow rate over the most
A large number of processes. After such a cycle of 3,4-cycle conditions can be turned toward
Stable. This condition frequently occurs, on average there one day to 2 times, Yan
Weight affected the yield and purity argon.
Although since then tried many ways to solve this problem, but
Effects are not obvious. In the debugging process, I come to realize this
Phenomenon of sperm plug argon column caused by severe nitrogen, in order to solve the nitrogen is essential in Cyprus
To reduce the nitrogen content of argon fraction. However, if the lower nitrogen, argon distillation
Sub-argon content will be lower, which should affect the precision of argon production.
However, in order to ensure continuous and stable operation of the system and had to resort to this
Kinds of ways. In this case, but to maintain the argon-argon content of distillate
AIA701 6% ~ 7%, the craft argon flow FIC702 in 150m3Ph
About. Even so, precision argon column is not Ningqi emissions are still large,
In essence argon column pressure or resistance to severe fluctuations, if not timely adjustments
Fine argon column condenser pressure control parameters, operating conditions will be deteriorated.
2 Failure Causes and solutions
By chance, after the inspection found PCV704 flowmeter
FI750 get stuck. Then removed to clean, by the way the front of the tube
And also remove the purge valve V753. When the purge valve V753
Found that the use of smaller valve springs pushing not to do this. Took over
The past few days, in the absence loaded check valve and flow meter in the circumstances
Argon system, the operating system, and found that no undue fluctuations in operating conditions, stability
Also increased.
The analysis found that the reasons for the failure: Due to pressure from the more refined argon column
Low, can not open the valve, precision argon column pressure will rise, when the
Up to a certain value, the valve opens, discharging no Ning Qi, precision argon column
The pressure drop valve again closed. Such a cycle, making fine
Frequent fluctuations in the pressure argon column. And because nitrogen in the fine over the top of argon column
Multi-accumulation, thus affecting the fine work of argon column condenser, that is caused by nitrogen
Plug. When the valve removed, the non-Ning Qi can freely discharge,
No longer produce the accumulation of fine working condition argon tower also normal.
This issue is resolved, other problems will be solved. In the Public
Condition stabilized, gradually fraction of argon-argon content increased to 8% ~ 10%,
Process argon flow rate also increased from 150m3 / h gradually increased to 180,
200 and 220m3 / h, maximum flow rate reached a 225m3 / h, far exceeding the
After a design output, argon extraction rate reached 71,188 percent, and the system
Can be normal and stable operation.
3 effects and additional measures
Troubleshooting before, crafts argon flow was 150m3 / h, liquid argon
Production of about 416m3 / d; now, technology argon flow rate 225m3 / h, liquid argon
Production of 617m3 / d. According to market price 1,000 yuan / m3 per day
Can increase the effectiveness of 2,100 yuan, the annual operating according to 330d terms, the annual benefit
To 69.13 million yuan. At the same time the rate of oxygen production and extraction have increased sharply,
Follow-up system for ensuring the normal production can not be underestimated role.
The role of valve: When the refined argon column abnormal situation has led to a negative
Pressure, to prevent the outside world refined argon gas into the tower.
That has seriously affected the normal production, apparently being should be removed. To
Remove the check valve to avoid security problems caused, has taken the following
In two ways: ① PCV704 valve solenoid valve installed in the setting of low -
Closed under the pressure of the whole; ② modified pressure level corresponding quality and reliable
Valve.