Problems with changing tanks of raw materials at catalytic cracking reaction stations
Thread Content
At the post, the raw material tank is almost finished. It is necessary to use a new tank. The raw material is transported to two counties. The properties of the raw material in the new tank are analyzed. If the raw material does not contain water, how to prevent the bed temperature from fluctuating when the property is heavy? When the property is light, how to prevent the bed temperature from fluctuating?
The simplest way is to gradually bring in new cans in advance, share the two cans for a period of time, the longer the time, the smaller the fluctuation, and then gradually cut out the empty cans.
That is, new tanks are slowly integrated into the use line in advance according to a certain proportion, and the old and new tanks are used together, and then the proportion of new tanks is gradually increased, and the outlet valve of the old tank is closed until it is completely switched. In this way, the reaction station can have sufficient time to adjust, and the bed temperature can be ensured to have little fluctuation.
When changing tanks, it is best to contact the tank farm more slowly when necessary. During operation, pay attention to adjusting the amount of raw materials entering the riser according to the bed temperature. Even the heat taken by the heater must be adjusted in time! ! An important aspect is to pay attention to the preheating temperature of the raw materials! !
Analyze the raw material components in the new tank in advance, and adjust the flow ratio to the old tank according to the weight of the ingredients. Remember not to wait for one tank to be finished before analyzing the new tank. There must be an advance amount. During operation, the flow rate must be adjusted according to the bed temperature to ensure the stability of the bed temperature.
I didn’t make it clear, but it was the raw material tanks from the tank farm and the raw material buffer tanks in the device. If it is in the tank area, cut the two tanks slowly to minimize fluctuations. If you feel the changes in the raw materials during the operation, make timely adjustments. If the quality is not up to standard, you will blame it on this one.
The raw materials for catalysis in our factory are all residual oil from normal pressure. The preheating temperature rises by more than 10 degrees every time the tank is poured in the irrigation area, making it difficult to control the temperature of the regeneration bed. Our process is to exchange heat between the normal pressure residual oil and the raw oil at normal pressure from the irrigation area to lower its temperature. However, after each tank pouring, the heat exchange effect drops significantly. In many cases, standby water cooling is used, and the pressure of normal pressure electric desalination will also increase and fluctuate significantly. I would like to ask everyone, what is the reason why the heat exchange effect suddenly deteriorates at this time? Does the raw material contain water? How to prevent it? ? ? ? Thanks