Multivariable optimization of thermal cracking severity |
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Authors: | Mohammad GhashghaeeRamin Karimzadeh |
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Affiliation: | Chemical Engineering Faculty, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, Iran |
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Abstract: | The changing market forces are driving olefin producers to operate their steam crackers at high operating rates and optimum production performances. These require the use of an optimizer for assessment of viable operational strategies. Most of the optimizers currently employed in this area make use of the coil outlet temperature to determine an improved severity. In rare cases only, a multivariable optimization is performed on the furnace operational conditions. This kind of optimization is implemented in PyroFur for optimizing both the furnace operation and the reaction severity using a set of first-principles mathematical models in which the coil outlet temperature, the total feed flow rate and the steam/hydrocarbon ratio are altered. The suggested procedure was applied as a case study for a typical liquid furnace. Typical improvements obtained from the optimizing control strategy proposed in this article include about 1.4% increased profitability per year per furnace. Effect of a change in the prices or the feed composition is also presented. |
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Keywords: | BFW, boiling feed water CIT, coil inlet temperature (° C) COP, coil outlet pressure (bar-absolute) COT, coil outlet temperature (° C) DESUP, signifies desuperheater DSSH, designation for preheater of dilution steam ECO, designation for preheater of boiling feed water, economizer FPH, designation for hydrocarbon feed preheater GC, gas chromatography HC, stands for hydrocarbon HPS, acronym of dilution steam HPSSH, designation for heat exchangers of high-pressure steam HTC, designation for preheaters of the mixture of steam and hydrocarbons LPG, liquefied petroleum gas MS, mass spectrometry QSSA, quasi-steady-state assumption TLX, transfer line exchanger |
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