How does catalytic reforming operate the pre-hydrogenation section?
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To ensure that the feed for reformation is of suitable quality, how should pre-hydrogenation be operated? What are the key control points?
The key control points include: pressure, temperature, hydrogen-to-oil ratio, space velocity, the impurity content of crude oil, and the operation of the stripping tower!
While following the operating procedures strictly, it is necessary to flexibly adjust objective conditions such as temperature and pressure related to reactions, while striving to meet the specified operational parameters; the operation curve represents your performance
Operations must be carried out strictly in accordance with the prescribed procedures, and the operational parameters must remain within the limits specified in the process cards. There are generally three key control points: first is the pre-distillation tower, which controls the initial boiling point of the feed to the reformer; this is very important. Second is the temperature in the pre-hydrogenation reaction system, as it directly affects the completeness of sulfur removal from the naphtha. If sulfur removal is incomplete, it can have a significant toxic effect on the reforming catalyst. Of course, the hydrogen-to-oil ratio, space velocity, and pressure also need to be controlled, but they are generally not considered primary adjustment parameters as their values remain fixed. Third is the operation of the stripping tower, which is crucial for removing the hydrogen sulfide and water generated during pre-hydrogenation reactions, thereby ensuring that the sulfur and water content in the feed to the reformer meets the strict requirements. The main parameters to be controlled here are the bottom and top temperatures of the tower; if these two parameters are within the appropriate range, the quality of the product can be guaranteed. Another aspect is level control – one of the level control mechanisms must be manual, and care must be taken in this regard. Generally, the liquid level at the bottom of the stripping tower is controlled manually, and this can be adjusted by changing the amount of pre-hydrogenation feed or reformer feed. A few thoughts. Everyone is welcome to add points or charm! ! !
To ensure that the feed for reformation is of suitable quality, how should pre-hydrogenation be operated? What are the key control points? ⒈Pay close attention to the testing results of products from upstream units; in case of any abnormalities, promptly inform the relevant upstream units, unit leaders, and production supervisors so that operations can be adjusted accordingly ； ⒉It is necessary to control the reaction temperature properly, eliminate metal impurities, and ensure that sulfur, nitrogen, oxygen, etc. in the raw materials are reduced to acceptable levels ； ⒊Control the bottom temperature of the evaporation tower and the reflux rate to ensure proper removal of hydrogen sulfide and moisture ； ⒋Control the temperature of the sensitive plate in the evaporation tower to ensure stability in the reforming reaction as well as in subsequent distillation operations ； ⒌According to the changes in the reprocessing volume required by production, the pre-hydrogenation feed rate and the temperature of the sensitivity plate are adjusted in a timely manner to ensure system stability.
This post was last edited by Jinghua on 2009-7-4 01:01. Among the operating parameters of a stripping tower, the reflux ratio is the most important; whereas the bottom and top temperatures may exceed the originally set control ranges due to changes in the feed composition, and this has no impact on the stripping process. If the APC control of your unit is activated, you will find that the temperature range settings at both the top and bottom of the tower are quite large. The fractionation tower serves to remove the light components from the reforming feed; in other words, it controls the composition of the reforming feed, playing a crucial role in the reforming reaction. It requires great care to adjust the bottom temperature according to changes in the raw materials.
The reaction temperature, pressure, space velocity, and hydrogen-to-oil ratio need to be well controlled； Tank, tower level ； Adjust the operation of the stripping tower ； Pay attention to the pressure drop in the reaction system ； Also pay attention to monitoring system corrosion, and be mindful of adjusting the water injection volume ； Another thing is to control the product parameters: S: 0.25~0.5 ppm N: