Feed coarse argon column

I feel that the speed is low, it’s extremely cold, and the level of the main cooling fluid is high; operation can begin once there is sufficient cooling capacity. Most importantly, you need to explain how you bring it into operation, so that everyone can understand why there are such large fluctuations.

Agree with what was said above; you need to explain the process of putting it into use as well as the condition of the main tower, so that an accurate analysis and judgment can be made

The throwing process should be slow. Also, the main coolant level needed to be set a bit higher the day before yesterday. Throw it again.

The main cooling issue is that you’re adding it too quickly; add it slowly, do it over the course of a day, and open the valves gradually. The drop in liquid level at the bottom is due to your improper control of the argon pump flow. The argon system cannot prioritize speed; stability is required!

Note that going too fast can also cause the main tower to become unbalanced, thereby compromising the purity of the product~~

It is necessary to cool down completely; this increases the resistance in Tower 2 for crude argon to above its maximum value, and the liquid level rises above the feed inlet of Tower 2 for crude argon

This post was last edited by yefeng13 on 2015-7-13 at 22:43. I haven’t been here for a while; I’ve just started learning about air separation, so I’d like to share my personal opinions: The underlying cause of the phenomenon mentioned by the original poster is an excessive and rapid transfer of cooling capacity from the main tower to the argon system. This can be attributed to two main types of reasons: 1. When the argon system is fully cooled, towers 1 and 2 increase their load too quickly, preventing proper circulation from being established. The cooling capacity from the two towers cannot be effectively returned to the main tower through one tower; in other words, the cooling balance is not maintained. 2. The argon system has not been cooled down sufficiently; this is easy to understand. The cooling tower requires a large amount of cooling capacity, and when argon is introduced into the system, it will inevitably lead to excessive loss of cooling capacity in the main tower (in other words, an overly rapid increase in load). Here are some personal thoughts on the argon injection system: 1. It’s better to keep a slight amount of argon in the system during purification; in other words, deliberately activate the argon system while performing purification. This way, the fluctuations in the main coolant temperature will be less severe when load is applied. 2. Control the amount of process argon flowing out of the second tower. The slowest aspect in the argon system is the reduction of oxygen content in the first tower; it is possible to increase the flow from the first tower to the second tower based on the operating conditions, and then control the amount flowing out of the second tower, so as to increase the liquid holdup on the plates of the second tower and establish the desired operating conditions as quickly as possible. This is beneficial for maintaining stability in the operating conditions as well as achieving a balance in cooling capacity. 3. It would be even better if the unit has a return pipeline from the bottom of the refined argon column to the crude argon column; in that case, there is no need for venting, as the gas coming out of the second column can be directly fed into the refined argon column and then returned to that column. This allows for an optimal circulation of cooling capacity. However, this is possible only if the operators have a good understanding of distillation processes and solid operational skills. 4. As mentioned by others earlier, it is essential to have enough cooling capacity stored before activating the argon injection system. Of course, individual operational skills can affect the distribution of cooling capacity, leading to increased or decreased cooling losses. It’s also possible for the operating conditions of the main column to be affected by the activation of the argon injection system; I have seen such situations occur. 5. To add more, when using an argon injection system, it is advisable to avoid pressurizing the molecular sieve; it’s best to delay this process by half an hour. Additional note: The above views are based on a process perspective, excluding factors such as equipment, valves, and instruments

Why do we have to do this? Please explain. Thank you.

How long does it generally take to establish a normal crude argon circulation after starting the supply of crude argon? Thank you!

The main issue is that it hasn’t cooled down fully; the increase in pressure at 703 during the day shift was too rapid, and moreover, the valve setting at 703 is too low, which leads to gas-liquid entrainment. In operations, adjustments should be made slowly, with stability as the priority. Personally, it is recommended not to increase the value of 703 too quickly nor to reduce it; maintain proper control of the liquid level in Tower 1, and the system will stabilize as the crude argon circulation is gradually established. Is the main cooling liquid level fluctuating so much?