Flowsheeting of steam cracking furnaces

Karimzadeh, Ramin; Godini, Hamid Reza; Ghashghaee, Mohammad

doi:10.1016/j.cherd.2008.07.009

Cited by 48 publications

(35 citation statements)

References 15 publications

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“…The reactor model (the kinetic model with mass, energy and momentum balances), the operational constraints, and the severity target altogether formed the constraints upon the optimization problem. Further details concerning the firstprinciples equations are available elsewhere (Karimzadeh et al, 2009). An important point to be taken into account is precise estimation of the heat flux around the tube as a boundary condition between the process side (reactor coils) and the fire side (radiant box).…”

Section: Resultsmentioning

confidence: 99%

“…The fuel-gas flow rate, the location of gas burners, relative capacities of floor to sidewall burners, shape of the firebox, the coil configuration and geometry, and the firing pattern altogether determine the heat flux profile along the coil which is obtained from an iterative computation between the two (process and fire) sides of the furnace. We usually calculate it (Ghashghaee and Karimzadeh, 2007;Karimzadeh et al, 2009) through a detailed analysis of both convective and radiative heat transfer within the firebox via the zonal method of Hottel. In this program, however, we adopted another policy to accelerate the computations.…”

Section: Resultsmentioning

confidence: 99%

“…The furnace simulation model incorporated in this optimizer has earlier proved to be reliable in reproduction of the experimental data (Karimzadeh and Ghashghaee, 2008;Karimzadeh et al, 2009). An additional list of validation data has been provided in Table 1 for the operation of the furnace at hand.…”

Section: Resultsmentioning

confidence: 99%

“…These make it impossible for an operator to determine the optimum without use of modeling tools and optimizers. Examples of a simulation model are found in our previous works on these furnaces (Karimzadeh and Ghashghaee, 2008;Karimzadeh et al, 2009). The most important aspect in advanced process control of a thermal cracker is the control of the reaction severity.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Multivariable optimization of thermal cracking severity

Ghashghaee¹,

Karimzadeh²

2011

Chemical Engineering Research and Design

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multivariable optimization of thermal cracking severity

Ghashghaee¹,

Karimzadeh²

2011

Chemical Engineering Research and Design

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“…Besonderer Wert wurde auf die Schließung der Stoff‐ und Energiebilanzen gelegt. In der Prozessroute OTO&CCU werden Olefine auf Basis von Erdöl ( oil to olefin , OTO) durch thermisches Spalten (Steamcracken) der aufbereiteten Naphthafraktion und anschließende Quenchung, Aufbereitung und Produkt‐fraktionierung erzeugt , . Hierbei handelt es sich um die in Europa vorherrschende Herstellungstechnologie.…”

Section: Betrachtete Prozessroutenunclassified

A Concept for the Circular Carbon Economy Sector Coupling of the Energy, Waste, and Chemical Industry

Meyer

Keller

Wolfersdorf

et al. 2017

Chemie Ingenieur Technik

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A concept for a stepwise closure of the carbon cycle through a coupling of low emissions coal chemistry, waste management, and energy sectors via co-gasification of coal and waste with the integration of renewably generated hydrogen is introduced. Goal is the achievement of zero CO 2 emissions through an integration of renewable energy. Results from a case analysis of the required demand for renewable energy to achieve this goal for olefin production in Germany is presented. Findings show that the gasification route requires only about half the renewable energy to achieve zero CO 2 emissions compared to other routes.

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Hydrogen production via chemical looping dry reforming of methane: Process modeling and systems analysis

Mantripragada

Veser

2022

AIChE Journal

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The present study presents and analyses a family of "chemical looping dry reforming" (CLDR) processes that produce inherently separated syngas (H 2 and CO) streams via a combination of methane cracking in a "cracker reactor" and the Boudouard reaction (i.e., conversion of the formed carbon with CO 2 to CO) in a "CO 2 reactor," and then further maximize the H 2 yield via conversion of the produced CO via water-gas-shift.Remaining CO 2 emissions are minimized via CO 2 capture and sequestration. Four different configurations are evaluated which differ in how the heat required for the highly endothermic dry reforming reaction is supplied: (i) combustion of additional CH 4 feed (CLDR-CH 4 ); (ii) combustion of some of the CO produced in the CO 2 reactor (CLDR-CO); and combustion of some of the carbon produced in the cracker reactor with (iii) pure oxygen (CLDR-C-oxy); or (iv) with air (CLDR-C-air). Process models are developed to comparatively analyze the mass and energy balances of these configurations, and benchmark them against H 2 -production via conventional dry reforming and steam reforming of methane. Our results show that CLDR-C-oxy is the most promising H 2 -production pathway among the chemical looping and conventional technologies both in terms of chemical energy efficiency and in terms CO 2 emissions. Thus, the unique flexibility offered by the production of inherently separated syngas streams in CLDR enables overcoming the disadvantage of the strongly endothermic dry reforming reaction by combusting carbon internally in the reactor and thus achieving highly effective heat integration. Overall, the results support the technical viability and demonstrate the promise for strong process intensification of CLDR compared to conventional dry reforming and even steam reforming, the most widely used H 2 -production pathway to-date.

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Flowsheeting of steam cracking furnaces

Cited by 48 publications

References 15 publications

Multivariable optimization of thermal cracking severity

Multivariable optimization of thermal cracking severity

A Concept for the Circular Carbon Economy Sector Coupling of the Energy, Waste, and Chemical Industry

Hydrogen production via chemical looping dry reforming of methane: Process modeling and systems analysis

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