Application of a Semi‐Mechanistic Model for Cracking Unit Balance

Karaba, Adam; Zámostný, Petr; Bělohlav, Zdeněk; Lederer, Jaromír; Herink, Tomáš

doi:10.1002/ceat.201400628

Cited by 10 publications

(10 citation statements)

References 22 publications

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“…The detailed composition of such a naphtha feedstock included a predetermined set of approximately 150 hydrocarbon components, representing all H 2 –C 8 hydrocarbon species present in primary naphthas and selected C 9 + species. The selection of those 150 components matched the standard input vector of the PYROL simulation model , used for calculation of the product yields.…”

Section: Substitute Composition Generation Proceduresmentioning

confidence: 99%

“…It was used to support the design process of a new reactor coil by ABB Lummus in Chemopetrol Co. plant , . It was also applied as a balance tool for long‐term monitoring of an entire production unit , for improvement of process control and production planning , . Also, the absolute middle deviation of predicted product yields has been determined using a long series of data.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Also, the absolute middle deviation of predicted product yields has been determined using a long series of data. In the cases of naphtha feedstock, the middle deviation is 0.5 wt % for methane, 0.9 wt % for ethylene, 0.6 wt % for propylene, and 1.0 wt % for the C 4 fraction . Finally, the model was applied to the search for economically optimal conditions and blending of naphtha feedstocks for the steam cracking process , .…”

Section: Mathematical Modelmentioning

confidence: 99%

“…In our previous work , a mathematical model of steam cracking was developed, which can predict the cracking yields of primary naphthas and other steam cracking feedstocks using the detailed feedstock composition. Here, this work is extended by providing the model with the ability to make the simulation using only the empirical criteria.…”

Section: Introductionmentioning

confidence: 99%

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Substitute Composition of Naphtha Based on Density, SIMDIST, and PIONA for Modeling of Steam Cracking

2017

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Despite rigorous models of the steam cracking processes being available for simulation of naphtha cracking, the simulation is often carried out using limited characterization of such a feedstock due to unavailability of detailed composition at the time when the simulation is required. A method was developed for generation of substitute naphtha composition meeting specified properties. Sets of alternative compositions were generated, matching the density, distillation curve, and optionally PIONA of real naphtha feedstocks. Its cracking product yields were calculated using a validated cracking model. Simulated product yields were evaluated in terms of result variability and deviation from the experimental data, depending on the level of available feedstock characterization.

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Section: Substitute Composition Generation Proceduresmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Substitute Composition of Naphtha Based on Density, SIMDIST, and PIONA for Modeling of Steam Cracking

2017

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“…Model PYROL has been tested in details in our recent paper where it was verified as balance tool [20]. From all reported data, determined deviation in the model prediction is relevant for current work.…”

Section: Model Brief Descriptionmentioning

confidence: 99%

Semi-mechanistic Model Applied to the Search for Economically Optimal Conditions and Blending of Gasoline Feedstock for Steam-cracking Process

Karaba

Zámostný

Herink

et al. 2016

MATEC Web of Conferences

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Abstract. Steam-cracking is energetically intensive large-scaled process which transforms a wide range of hydrocarbons feedstock to petrochemical products. The dependence of products yields on feedstock composition and reaction conditions has been successfully described by mathematical models which are very useful tools for the optimization of cracker operation. Remaining problem is to formulate objective function for such an optimization. Quantitative criterion based on the process economy is proposed in this paper. Previously developed and verified industrial steam-cracking semi-mechanistic model is utilized as supporting tool for economic evaluation of selected gasoline feedstock. Economic criterion is established as the difference between value of products obtained by cracking of studied feedstock under given conditions and the value of products obtained by cracking of reference feedstock under reference conditions. As an example of method utilization, optimal reaction conditions were searched for each of selected feedstock. Potential benefit of individual cracking and cracking of grouped feedstocks in the contrast to cracking under the middle of optimums is evaluated and also compared to cracking under usual conditions.

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Ethylene fractionator pressure relieving system assessment and modification

Herink

Růžička

Malecký

et al. 2021

Process Safety Progress

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The refinery and petrochemical production facilities process and produce the gaseous and liquid flammable hydrocarbons. Most of the processes are operated under high pressure. In case of any failure, improper design or human mistake there must be autonomous and independent pressure relieving systems activated to release the pressure to the flare systems to protect the equipment against the overpressure, damages and other consequences. The article describes a safety assessment of key process pressure relief valve installation at the Steam Cracker in Litvinov, Czech Republic. The intent of the safety assessments was evaluation the functionality of the process relief valve installation, to ensure the system meets the appropriate recognized and generally acceptable engineering practices and to confirm that the system can be operated safely. The article provides results and recommendations for the Ethylene Fractionator pressure relief valves, pipes, and support modifications as well as results of the relieving scenarios determinations and calculation.acoustic resonance, ethylene fractionator, loss of cooling, pressure relief valves, steam cracker | INTRODUCTIONPressure relief valves (PRVs) are key and irreplaceable devices for safe operation and prevention of extraordinary events. The PRVs are designed to release the excess pressure from the system to protect the pressure vessel or pressure system from overpressure and consequent damages. They are autonomous devices that open and close according to the defined values without the influence of an operator or other systems, such as the control system or the emergency shutdown system. The design of the pressure relieving system is a complex problem and there must be paid a special attention to meet all industrial codes, standards, rules, and best engineering practice. There are many installations worldwide in refining and petrochemical industry built in 70s and 80s of the last century where the original design could not have been donerespecting and reflecting todays level of knowledge, experience as well as the process safety rules and recommendations. As there are technologies designed more than 20 years ago, the pressure relieving systems can be obsolete. It can be observed the original relieving systems design used to be focused mainly on sufficient relieving capacities accepting conservative assumptions without considering other rules to ensure a stability. This article describes specific and critical rules which can strongly impact the proper functionality of the pressure relieving system. 1,2 These are namely the inlet pressure drop limit at a maximum of 3% of the relief valve set pressure, 3,4 the back pressure value 5 at the relief valve outlet, correct setting of the relief valve opening pressure for multiple installations, optimal relief valve relieving capacity and last but not least the resistance of the whole system to any generated vibrations. 6,7

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Application of a Semi‐Mechanistic Model for Cracking Unit Balance

Cited by 10 publications

References 22 publications

Substitute Composition of Naphtha Based on Density, SIMDIST, and PIONA for Modeling of Steam Cracking

Substitute Composition of Naphtha Based on Density, SIMDIST, and PIONA for Modeling of Steam Cracking

Semi-mechanistic Model Applied to the Search for Economically Optimal Conditions and Blending of Gasoline Feedstock for Steam-cracking Process

Ethylene fractionator pressure relieving system assessment and modification

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