Who knows how to implement direct hydrogen feeding?
Thread Content
The hydrogenation feedstocks in our plant are heavy catalytic diesel, coker gasoline, and coker diesel. First, the intermediate products from the heavy catalytic and coking units are fed into a hydrogenation feed buffer tank, and then into the hydrogenation unit. In October this year, I read a report in the Sinopec News titled \"Some plant upgrades will allow heavy diesel and coker diesel to be fed directly into the hydrogenation process.\" I would like to ask those working in oil refining in this field: have you carried out such modifications on similar installations? If so, please explain in detail! ! I want to know how it’s achieved. Will the liquid in the hydrogenation feed pump vaporize when coked gasoline is heated to a temperature of 70–80 degrees? ?
Our unit is designed such that the oil coming from the synthesis unit is divided into light oil, heavy oil, and heavy wax. The light oil is fed into the hydroprocessing pretreatment reactor at 40 degrees Celsius, while the heavy oil is fed in at 160 degrees Celsius. The heavy wax is pressurized using a high-pressure feed pump (to 180 degrees Celsius) and then mixed with the products of the hydroprocessing pretreatment reaction before being fed into the hydroprocessing refining reactor. The refined products are sent for vacuum distillation, and the vacuum residue is further subjected to hydrocracking. Hydrogenation direct feeding can save energy! It is the direction of the design
Thanks, I kind of get it now! :hug: ::hug:
In the case of mixed gasoline and diesel hydrogenation, a pressurization process can be established on the feed tank, using nitrogen or high-pressure gas, etc.
In particular, coker gasoline tends to form gums very easily when exposed to air; therefore, under suitable conditions, it is generally fed directly into the hydrogenation unit. For other petroleum products, however, not many are fed directly in order to ensure operational stability
The key is to determine the temperature of the light oil and the feed ratio. Once the proportion of light oil is determined, it can be directly mixed into the reactor after the diesel exits the heater.
1. The key to direct feed supply is the stable operation of upstream and downstream units; changes in the properties of the raw materials can lead to variations in product yield, which in turn causes fluctuations in the feed rate to the downstream units； 2. Consideration of the overall thermal balance of the plant, with particular emphasis on the use of low-temperature heat, should be a key focus for optimization after direct feeding ； 3. Achieving direct feed supply is the trend in oil refining going forward, and it plays an important role in reducing the overall energy consumption of the plant ；