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When the catalytic cracking unit is shut down and the reaction station is reduced, the liquid level at the bottom of the fractionation tower will be low. The fractionation station will reduce the circulation volume of each side line. In this way, when the middle section of the fractionation heat source is used for stabilization, the bottom temperature of the stabilization station will also drop (both the desorption tower and the stabilization tower use the middle section of the fractionation as the heat source). Before the reaction station is reduced and the feed is not cut off, the temperature will remain low, which will cause insufficient stable heat sources. So should the stabilizing station open up the heat extraction from the bottom of the two towers and try to maintain the normal temperature at the bottom of the desorption tower and the stabilizing tower to ensure that the product is qualified? for example: When the reaction decreases, the temperature at the bottom of the tower is stabilized at 159 degrees, the temperature at the top of the tower is stabilized at 47 degrees, and the temperature at the bottom of the desorption tower is 89 degrees. Normally, the bottom of the stable tower is 165 degrees, the top of the stable tower is 53 degrees, and the temperature at the bottom of the desorption tower is 92 degrees. Do you want to turn up the heat as much as possible to bring the temperature back to normal? (However, even if the heat is turned up during operation, the temperature rise is very small, and it is difficult to return to the normal temperature. The temperature at the top of the tower is 47 degrees. Is it correct to only turn down the top reflux to a very small level and turn the top reflux to a very small level? Will the small backflow at this time cause the liquefied gas to fail? This post was last edited by Shui Changshou on 2009-2-3 22:09 ]