20171017 Atmospheric and Vacuum Distillation Questions and Answers
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How can one determine that the water has been completely removed during the dehydration phase of operation?
During the dehydration stage, the method of “listen once”, “look twice”, and “observe three times” is used to determine whether all the moisture has been removed. Listen: Check if there are any sounds inside the tower; if there are, it indicates that water is still present, whereas the absence of such sounds suggests that the water has been almost completely removed. Second, check the atmospheric tower and the oil-water separator in the vacuum tower to see if water is being discharged, and whether the pressure in front of the furnace is stable. Three observations: Observe the temperature difference between the feed and the bottom of the tower. If this difference is small and stable, it indicates that the moisture has been essentially removed.
During the dehydration stage, the method of “listen once”, “look twice”, and “observe three times” is used to determine whether the moisture has been completely removed. Listen: Check if there are any sounds inside the tower; if there are, it indicates that water is still present, whereas the absence of such sounds suggests that the water has been almost completely removed. Second, check the atmospheric tower and the oil-water separator in the vacuum tower to see if water is being discharged, and whether the pressure in front of the furnace is stable. Three observations: Observe the temperature difference between the feed and the bottom of the tower. If this difference is small and stable, it indicates that the moisture has been essentially removed.
Answer: During the crude oil circulation heating phase at the start-up of this unit, there are mainly three tasks: heating, dehydration, and switching the crude oil. The entire process is characterized by an increase in temperature, and the main challenge in ensuring this temperature rise is dehydration. During the dehydration stage, the method of “listen once”, “look twice”, and “observe three times” is used to determine whether all the moisture has been removed. Listen: Check if there are any sounds inside the tower; if there are, it indicates that water is still present, whereas the absence of such sounds suggests that the water has been almost completely removed. Second, check the atmospheric tower and the oil-water separator in the vacuum tower to see if water is being discharged, and whether the pressure in front of the furnace is stable. Three observations: Observe the temperature difference between the feed and the bottom of the tower. If this difference is small and stable, it indicates that the moisture has been essentially removed.
The top reflux temperature was increased to 100°C, and no water could be drained from the reflux tank
During the dehydration stage, the method of “listen once”, “look twice”, and “observe three times” is used to determine whether the moisture has been completely removed. ? Listen: Check if there are any sounds inside the tower; if there are, it indicates that water is still present, whereas the absence of such sounds suggests that the water has been almost completely removed. Second, check the atmospheric tower and the oil-water separator in the vacuum tower to see if water is being discharged, and whether the pressure in front of the furnace is stable. ? Three observations: Observe the temperature difference between the feed and the bottom of the tower. If this difference is small and stable, it indicates that the moisture has been essentially removed.
During the crude oil circulation heating phase at the start-up of this unit, there are mainly three tasks: heating, dehydration, and switching the crude oil. The entire process is characterized by an increase in temperature, and the main challenge in ensuring this temperature rise is dehydration. During the dehydration stage, the method of “listen once”, “look twice”, and “observe three times” is used to determine whether all the moisture has been removed. Listen: Check if there are any sounds inside the tower; if there are, it indicates that water is still present, whereas the absence of such sounds suggests that the water has been almost completely removed. Second, check the atmospheric tower and the oil-water separator in the vacuum tower to see if water is being discharged, and whether the pressure in front of the furnace is stable. Three observations: Observe the temperature difference between the feed and the bottom of the tower. If this difference is small and stable, it indicates that the moisture has been essentially removed.
During the crude oil circulation heating phase at the start-up of this unit, there are mainly three tasks: heating, dehydration, and switching the crude oil. The entire process is characterized by an increase in temperature, and the main challenge in ensuring this temperature rise is dehydration. During the dehydration stage, the method of “listen once”, “look twice”, and “observe three times” is used to determine whether all the moisture has been removed. Listen: Check if there are any sounds inside the tower; if there are, it indicates that water is still present, whereas the absence of such sounds suggests that the water has been almost completely removed. Second, check the atmospheric tower and the oil-water separator in the vacuum tower to see if water is being discharged, and whether the pressure in front of the furnace is stable. Three observations: Observe the temperature difference between the feed and the bottom of the tower. If this difference is small and stable, it indicates that the moisture has been essentially removed.
During the crude oil circulation heating phase at the start-up of this unit, there are mainly three tasks: heating, dehydration, and switching the crude oil. The entire process is characterized by an increase in temperature, and the main challenge in ensuring this temperature rise is dehydration. During the dehydration stage, the method of \"listen, look, and observe\" is used to determine whether all the moisture has been removed. Listen: Check if there are any sounds inside the tower; if there are sounds, it indicates that there is still moisture present, while the absence of such sounds suggests that the moisture has been largely removed. Second, check the atmospheric tower and the oil-water separator in the vacuum tower to see if water is being discharged, and whether the pressure in front of the furnace is stable. Three observations: Observe the temperature difference between the feed and the bottom of the tower; if this difference is small and stable, it indicates that the moisture has been essentially removed
During the dehydration stage, the method of “listen once”, “look twice”, and “observe three times” is used to determine whether all the moisture has been removed. Listen: Check if there are any sounds inside the tower; if there are, it indicates that water is still present, whereas the absence of such sounds suggests that the water has been almost completely removed. Second, check the atmospheric tower and the oil-water separator in the vacuum tower to see if water is being discharged, and whether the pressure in front of the furnace is stable. Three observations: Observe the temperature difference between the feed and the bottom of the tower. If this difference is small and stable, it indicates that the moisture has been essentially removed.