What is the reason for the large temperature difference across the plane of the synthesis tower? How to adjust?

There are many reasons for this: 1. The catalyst is not evenly distributed, causing the gas to flow unevenly； 2. Uneven distribution of the cold tubes or local blockages in these tubes prevent heat from the catalyst bed from being removed in a timely manner ； 3. The cold gas distribution within the tower is uneven, and gas deflection leads to large temperature differences within the same plane ； 4. Damage to the internal components of the synthesis tower, resulting in internal flow deviation ； 5. Excessive valve movement during operation, etc. Recommendations: 1. If the filling is uneven, the only option is to maintain the current situation and wait until the machine stops to conduct an inspection ； 2. Appropriately reduce pressure to suppress some reactions at high temperatures ； 3. Appropriately increase the temperature of the catalyst bed to enhance the reactions in the lower-temperature region ； 4. If the above method is ineffective, reduce the load to decrease the temperature difference in the bed layer, and then increase the load ； 5. Stop and refill the material

Reply to 2# zhya113: Basically agree

In our plant, the temperatures on the two surfaces differ by nearly 50 degrees. As long as the ammonia content at the outlet remains stable and the outlet pressure is not too high, there is no major problem; it is sufficient to reduce the opening degree of the \"cold shock valve\" on the side with the largest temperature difference.

Our company has just replaced the catalysts; there is a temperature difference of 70 degrees across the surface during operation. We have no choice but to keep production going, as stopping the machine for inspection would be too costly. Besides the above reasons, it is related to rubbing against the temperature measurement point.

This post was last edited by Gaxia on 2012-3-2 21:46. Our factory uses a 1000mm single-axis two-diameter setup; the temperature difference at the outlet on the first floor can reach up to 100 degrees, while it is even greater at the outlet on the second floor. To maintain production, when such large temperature differences occur, electric furnaces are used. Based on operational analysis, the cause of these large temperature differences is likely a leak in the internal component cover

Our company has just replaced the catalysts; there is a temperature difference of 70 degrees across the surface during operation. We have no choice but to keep production going, as stopping the machine for inspection would be too costly. Besides the above reasons, it is related to rubbing against the temperature measurement point. What causes such a large temperature difference? Good night; don’t let Xiao Jia feel upset anymore -

I. Is the quench valve damaged?； II. Whether the catalyst is oxidized, its activity is reduced, or it becomes inactive ； III. Are the instrument indications damaged? ； IV. Whether the equipment is damaged, resulting in offset current.

A difference of 50 degrees is not a significant issue; in normal production, adjust the cold shock line based on the pressure differences across various layers along with the temperature conditions, and see the effects.

Two more suggestions for the second floor: 1. The insertion depth of the thermocouples is incorrect, or the material of the temperature wires is not uniform. 2. The thermocouple outer tube is leaking air.

Agree that the circulation rate can also be increased upstairs, and the secondary line with a lower temperature can be used less often