【Q&A Question 079】2016.07.08
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【Q&A Question 079】July 8, 2016: The operating parameters of the unit were normal, but the temperature at the outlet of the air cooler for the reaction effluent was too high; increasing the speed of the fans did not help to lower this temperature. What could be the reason? The reference answer can be seen after submitting a response; scoring is based on identifying the key points. 1. The set value of the high-pressure air-cooling outlet temperature regulator is too high ； 2. Large-scale blockage or scaling of the high-pressure air-cooling tube bundle ； 3. Abnormal operation of the high-pressure heat exchanger resulted in an excessively high inlet temperature of the reactor effluent air cooler.
Answer: (1) The set value of the high-pressure air cooling outlet temperature regulator is too high. (2) Large-scale blockage or scaling of the high-pressure air-cooling tube bundle. (3) Abnormal operation of the high-pressure heat exchanger resulted in an excessively high inlet temperature of the reaction effluent air cooler.
1. It may be due to extensive blockage or scaling of the high-pressure air-cooling tube bundle; 2. It may be because the high-pressure heat exchanger is not operating properly, resulting in an excessively high temperature at the inlet of the air cooler for the reaction effluent.
It’s useless to turn on the fan; consider the instrument issues first
1. Excessive temperature of reactor catalyst； 2. Instrument failure, transmitting false signals
a. Large-scale blockage or scaling of the high-pressure air-cooling tube bundle; b. Abnormal operation of the high-pressure heat exchanger, resulting in an excessively high temperature at the inlet of the air cooler for the reaction effluent
High inlet temperature, air cooling blockage, high-pressure heat exchanger blockage