| Ethylene quench system is the first step of Ethylene pyrolysis gas disposal. Thegasoline fractionator is the most difficult tower in technology among all the ethyleneplant's units. Quench system usually is the bottleneck of ethylene plants, whichrestricts the yield and general performance of ethylene mills. By means of processsoftware PRO/II, ethylene quench system is simulated in this paper. Combined withthe data of several domestic ethylene plants, some of the usual problems encounteredin the operation of quench system are discussed in this paper.The composition data of pyrolysis gas has great influence on the result ofsimulation. But the data is highly complex and the locale data is unreachable. In thispaper, the data is obtained by "backing out" method. As pyrolysis gas is mostcomposed of petroleum hydrocarbon and water, the considerably accurate results canbe obtained by using equation of state SRK. The quench system of Zhongyuan andGuangzhou ethylene plants, which used Lummus and S&W technology, are simulatedin this paper.Moreover, some deeply researches have been made in this paper by using thedata of Guangzhou ethylene plants: several important parameters and their influencefactors of gasoline fractionator have been involved which are including top andbottom temperature, reflux ratio of gasoline etc.Different beds of gasoline fractionator have been discussed in this paper. Thefunction of quench oil circulation bed and pan oil circulation bed has been analyzedand compared through process simulation in this paper. The functions of gas oilstripper have been involved also.As for pyrolysis fuel oil stripper in Lummus technology, we owe it to fuel oilviscosity control system and summarized the methods domestic ethylene plants usedin two categories: stripper and vacuum flash. Different methods-stripper by ethanepyrolysis gas and vapor, vacuum flash-are deeply researched and discussed in thispaper on the basis of the data of Guangzhou ethylene plants. |
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