What is the reason for the high temperature at the top of the atmospheric tower when starting operation?
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Two methods are generally used during production: one is to release part of the gasoline during the cold cycle, and the other is to transport it by vehicle. This is to prevent the temperature at the top of the normal pressure tower from being too high when starting the operation. However, after several starts, the temperature at the top of the tower can basically rise to about 200° for more than an hour. No accidents occurred, and the entry temperature of the normal top reflux tank is not too high.
Does vehicle transportation refer to the ignition heating stage? The temperature at the top of the tower is 200 degrees, and the temperature is not high after cooling. So what happens to the pressure at the top of the tower and how does the feed temperature change?
Gasoline evaporates at 30 degrees Celsius. For the car we installed this year, the high temperature at the top of the tower is simply because the furnace is overheated and the cold return flow is low.
200℃? So high! How could it be so high if it wasn't for the tower?
We often encounter this problem. I tested it and found that the feed amount was too large and the temperature at the top of the tower remained high during the heating process. Reduce the feed amount, raise the temperature normally and open the measuring line, and then increase the processing amount and there will be no problem.
The key is that the mid-stage reflux pump can increase the volume in an emergency!
Control the heating rate and collect a tank of oil in the reflux tank before starting work, and you can control it!
This post was last edited by chengkang on 2010-3-3 15:54. It’s heating up fast. It's easy to rush the tower if you don't get it right.
Add oil to the top reflux tank. This is a common method. Pay attention to top reflux and suppress the top temperature. The processing volume when starting work cannot be too large. This is also one of the reasons. There is also whether the interrupted return flow can be made up in time. In fact, it depends on your specific regulations. We used to be a small factory and were not so particular about it. It is normal for high temperatures at the top to occur when starting work. We omit the constant temperature heating and directly raise the temperature, so both the interrupted reflow and the top reflow can be replenished quickly. If you want to operate step by step, it is recommended that you control the feed amount to be smaller and increase the amount slowly. Of course, it is best to add some oil to the reflux tank. I don’t know much about it. I haven’t done production for several years. Please forgive me if I answered wrongly.
The main reason is that during the startup and heating process, the vapor and liquid phase loads in the atmospheric tower are unbalanced. When the mid-stage reflux is not established, the furnace outlet heats up too quickly, and the vapor phase load is greater than the liquid phase load, resulting in a high temperature at the top of the atmospheric tower. measure: 1. When the temperature at the top of the tower reaches 80°C, cool down and reflux in time to control the temperature at the top of the tower. 2. Control the furnace outlet temperature rise rate to around 15°C/h. 3. When there is oil at the inlet of the constant top circulation pump, start the top circulation pump to control the temperature at the top of the tower. 4. Start the Changyizhong and Changerzhong pumps in time. 5. Increase the amount slowly.
:victory: The correct answer on the 10th floor, I completely agree. Do not over-large the processing capacity in the normal pressure section, otherwise the vacuum tower will either be installed too high, or it will be easy to burn the package during vacuuming (top reduction oil will leak out).