【Weekly Topic】November Issue 1: What is the temperature of the winter atmospheric and vacuum residue leaving the unit?
Thread Content
Hello, dear sea friends. This week’s topic of discussion is related to the temperature of residue oil leaving the unit in winter. The main question to be addressed is: what should be the temperature control for residue oil exiting the unit during winter? What are the precautions for storage? I hope everyone will actively participate in the weekly topic discussions and propose new topics; 10 to 50 points in wealth will be awarded once such topics are adopted, so please get involved actively. I invite all members to engage in active discussions on this topic. For outstanding responses, I will give higher scores and award wealth rewards ranging from 10 to 50 based on the quality of the replies; for active participation in the discussions, rewards of 5 to 10 in wealth will be given. I hope everyone will participate actively! I hope everyone can learn something from this exchange Everyone is encouraged to participate! Dear sea friends, please engage in active discussions; feel free to share any new insights you may have! Participation is key; feel free to communicate!
I remember that in the atmospheric and vacuum distillation units I used to work at, the temperature of the vacuum distillate oil coming out of the units in winter exceeded 150°C; no auxiliary heating was used, but once it reached the tank area, the temperature was within the desired range of 60–80°C. The workshop supervisor said that it saves circulating water as well as steam, thus saving energy.
Try to answer: The temperature control for delivery should be between 70 and 95 degrees. There are temperature requirements for the cold residue oil stored in the tanks, generally not exceeding 100°C. We used coolers for cooling here in the past; a steam line was added to the water inlet to heat the water, which helped increase both the temperature and volume of the water entering the heat exchanger. Additionally, to increase the heat exchange area and the water temperature, a water jacket was installed on the outer wall of the heat exchanger. The cooling water first flowed into the water jacket before entering the tubes of the heat exchanger. Overall, the results were quite good. Currently, we use cold boxes for cooling, and the temperature is much easier to control compared to coolers. Using a cold box consumes some water, as it is evaporated into the air, but treated purified wastewater from the water treatment plant can be used. Such cold box designs are widely used in the slurry systems of older catalytic units. Additionally, if there is no other water at a higher temperature, it is certainly possible to use steam to heat the water; it just generates some noise on site and requires more steam. The so-called water jacket is simply a jacket that we create by welding steel plates to the outer wall of the cooler shell; there are discussions on this topic in this post: What are the techniques for feeding cooled residue oil into the cooler in atmospheric and vacuum distillation units? http://bbs.hcbbs.com/thread-1187622-1-1.html (Source: Haichuan Chemical Industry Forum)
Generally, it should be kept at 70 degrees in summer; in winter, it can be increased a bit, but it should remain below 100 degrees, with 90 degrees being an appropriate value.
160 degrees Celsius! ! ! ! ! ! ! ! ! ! ! ! ! !
The delivery temperature should be controlled between 70 and 95 degrees Celsius. There are temperature requirements for the cold residue oil stored in the tanks in the storage area, generally not exceeding 100°C. We used coolers for cooling here in the past; a steam line was added to the water inlet to heat the water, which helped increase both the temperature and volume of the water entering the heat exchanger. Additionally, to increase the heat exchange area and the water temperature, a water jacket was installed on the outer wall of the heat exchanger. The cooling water first flowed into the water jacket before entering the tubes of the heat exchanger. Overall, the results were quite good. Currently, we use cold boxes for cooling, and the temperature is much easier to control compared to coolers.
Section 5.0.2 of SH/T 3121 stipulates that, in the case of cold feed or cold discharge, the temperature of the residue entering and leaving the unit shall not exceed 90°C.