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In May, Maoming Petrochemical actively invested in the upsurge of "hundred days of tackling difficulties and creating benefits", seeking benefits from difficulties, overcoming plant bottlenecks such as short catalyst life and high alcohol content in the lean liquid system.
The monthly output of ethylene oxide was 28,000 tons, a new monthly history.
new high
.
The catalysts of the two units in the ethylene glycol workshop of Maoming Petrochemical Chemical Division have entered the end of their life, and the selectivity is decreasing year by year.
The lower the selectivity of the catalyst, the lower the yield of ethylene oxide
.
"The catalyst has a limit operation.
How to create the highest load for the safe and stable operation of the device within this limit is an urgent balance point that needs to be found
.
Due to the process design problem of the 2# unit, the alcohol content of the lean liquid system is too high, which leads to the poor absorption of ethylene oxide.
The unabsorbed ethylene oxide enters the reactor, which affects the activity of the catalyst, and the ethylene oxide is hydrolyzed into alcohol.
The increase in the amount of such products directly leads to a decrease in the output of ethylene oxide
.
The benefit of ethylene oxide ranks first in the ethylene product chain.
How to increase the output of ethylene oxide and withstand the high temperature "baking" test is the "hard bone" that urgently needs to be gnawed!
"The temperature is getting hotter and hotter, we have to find a way to bring it down!" The situation is not waiting for anyone.
On May 11, Yu Qing held a special group meeting to discuss how to optimize the lean liquid system
.
"There are many factors that lead to the problem of the lean liquid system.
It may be the operation of the stripping tower and the absorption tower, or it may be the equipment problem
.
"Since the hardware problem cannot be solved for the time being, then we rely on ourselves to find out the optimal parameter value step by step according to the actual operation!" In fact, since May, Yu Qing spent 10 hours in the central control room, except during the meal time.
In front of the operating table, guide the internal operation to optimize and adjust the pressure of the refining tower, from 270kPa to 220kPa, and maintain the refining system pressure at 220-230kPa, adjust the feed temperature of the stripping and rectifying tower above 100 ℃, and maintain the tower kettle temperature TI3240 , TI3241 above 100℃-120℃, to ensure sufficient analysis of ethylene oxide
.
Finally, after a week of hard work day and night, repeated adjustments, and a series of operations, the ethylene oxide concentration at the top of the ethylene oxide absorption tower was reduced from 250ppm to 100ppm
.
