Front separation and ‘locking’ during hydrocarbons co-combustion in a loop reactor

TY - JOUR

T1 - Front separation and ‘locking’ during hydrocarbons co-combustion in a loop reactor

AU - Nekhamkina, O.

AU - Madai, A. Y.

AU - Sheintuch, M.

N1 - Publisher Copyright: © 2017 Elsevier B.V.

PY - 2017

Y1 - 2017

N2 - While previous studies experimentally demonstrated sustained operation in a loop reactor (using ethylene or methane combustion), and analyzed the single-reaction case and suggesting a proper control scheme, an actual implementation of VOC combustion will involve several reactants of varying concentrations. Here we study the dynamics and design implications of a bi-species (methane or ethane and ethylene) and a multi-species combustion. We observe two main structures in which the two fronts are either locked or are separated, with the combustion front of the less reactive component leading the other front. We explain why the locked front structure is favorable as it requires smaller energy investment. We derive approximations for the front properties (maximal temperature, Tmi, velocity, vf) and the conditions for transition and portray these in the plane Tm vs Levf in a long once-through reactor. We show that these maps predict well the behavior in loop reactors.

AB - While previous studies experimentally demonstrated sustained operation in a loop reactor (using ethylene or methane combustion), and analyzed the single-reaction case and suggesting a proper control scheme, an actual implementation of VOC combustion will involve several reactants of varying concentrations. Here we study the dynamics and design implications of a bi-species (methane or ethane and ethylene) and a multi-species combustion. We observe two main structures in which the two fronts are either locked or are separated, with the combustion front of the less reactive component leading the other front. We explain why the locked front structure is favorable as it requires smaller energy investment. We derive approximations for the front properties (maximal temperature, Tmi, velocity, vf) and the conditions for transition and portray these in the plane Tm vs Levf in a long once-through reactor. We show that these maps predict well the behavior in loop reactors.

KW - Autothermal reactor

KW - Catalytic reactors

KW - Fronts propagation

KW - Heat recuperation

KW - Loop reactor

KW - VOC abatement

UR - http://www.scopus.com/inward/record.url?scp=85018755126&partnerID=8YFLogxK

U2 - 10.1016/j.cej.2017.04.072

DO - 10.1016/j.cej.2017.04.072

M3 - 文章

AN - SCOPUS:85018755126

SN - 1385-8947

VL - 323

SP - 618

EP - 632

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

ER -