Temperature of the feed oil buffer tank in the catalytic unit
Thread Content
Our current temperature is 130 degrees. When the temperature is low, the feed oil entering the lift pipe tends to experience fluctuations after heat exchange; what’s your temperature? !
In our unit’s DCC system, the raw material coming from the tank farm enters the raw material buffer tank first; there it is pressurized by a raw material pump and then heat-exchanged with the slurry before being sent to the lift pipe. The temperature of the buffer tank is equal to the temperature of the raw material from the tank farm, ranging between 60–90°C； The MIP unit sends the material coming from the tank farm, after heat exchange with reprocessed oil and slurry, to the raw material buffer tank; its temperature is relatively high, ranging between 180–220°C.
The temperature of my unit’s crude oil tank is around 70 degrees, generally. Generate less steam to maintain the feed temperature. If the temperature of the buffer tank is too high, as the original poster mentioned, if the raw material contains water, vaporization will occur, affecting the distillation process.
Ours is around 90 degrees, while the preheating temperature of the raw materials is around 220–240 degrees.
The temperature of the raw material buffer tank in the catalytic unit is generally the same as the temperature of the raw materials supplied from the tank area, around 70 degrees. It is then pressurized by a feed pump, heated through heat exchange, and fed into the riser reactor. A buffer tank is installed in the system to address failures of the raw material pumps in the tank area, thereby minimizing the impact on production and ensuring its continuous operation. Currently, catalytic units generally do not have buffer tanks; after dehydration in the tank area, the fluid is pumped directly into the unit for heat exchange before entering the riser reactor.
The raw materials for our unit consist of cold material at 90 degrees Celsius from the tank area, and hot raw materials at 170–250 degrees Celsius from the distillation unit. After heat exchange, the cold feed is combined with the hot feed in the feed tank, where the temperature rises to 210–230 degrees Celsius; thereafter, it undergoes further heat exchange before entering the lift pipe.
The raw materials for our unit consist of cold paraffin oil from the tank area and distilled residue; the feed temperature is 160 degrees Celsius, after which it is heated to 210 degrees Celsius before being fed into the lift pipe.
In our system, wax oil at around 85 degrees and residue oil at around 110 degrees come from the tank area; they are mixed together and then fed into a tank. The temperature in the buffer tank is around 95 degrees, after which the mixture is heated to 200 degrees before being sent to the lift pipe.
There is no uniform standard for this; as long as the material of the feed tank permits it, the higher the temperature, the better. However, it is necessary to prevent bumping caused by the light components in the feed. A high feed temperature can help save energy and enable heat transfer between units. This approach is more commonly used abroad according to the design recommendations currently in use
We have removed the raw material buffer tank in the unit; after arriving from outside the unit, the raw material undergoes heat exchange before entering the lift pipe.
The temperature of our buffer tank is 120°; after preheating, it rises to 220° before entering the lift pipe
The temperature entering the tank is also the temperature in the filling area; after all, heat exchange is required, and the temperature of the material entering the lifting tank is only around 220