Evaluation of an intensified continuous heat-exchanger reactor for inherently safer characteristics

Benaissa, Wassila; Gabas, Nadine; Cabassud, Michel; Carson, Douglas; Elgue, Sébastien; Demissy, Michel

doi:10.1016/j.jlp.2008.04.004

Cited by 28 publications

(13 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can only be achieved for those reactions which have a moderate heat of reaction, where the reaction rate constant is low at the operating temperature, and where the residence time is adjusted to the respective microreactor. Under these conditions, the thermal inertia of the system provides a heat sink and reduces a potential auto-acceleration of a reaction to temperature increases without risk of decomposition reaction (Benaïssa [52,53]). …”

Section: Resultsmentioning

confidence: 99%

Guidance on Safety/Health for Process Intensification including MS Design; Part I: Reaction Hazards

et al. 2009

View full text Add to dashboard Cite

The implementation of process intensification by multiscale equipment will have a profound impact on the way chemicals are produced. The shift to higher spacetime yields, higher temperatures, and a confined reaction volume comprises new risks, such as runaway reactions, decomposition, and incomplete conversion of reactants. Simplified spreadsheet calculations enable an estimation of the expected temperature profiles, conversion rates, and consequences of potential malfunction based on the reaction kinetics. The analysis illustrates that the range of optimal reaction conditions is almost congruent with the danger of an uncontrolled reaction. The risk of a spontaneous reaction with hot spots can be presumed if strong exothermic reactions are carried out in micro-designed reactors. At worst, decomposition follows the runaway reaction with the release of noncondensable gases. Calculations prove that a microreactor is not at risk in terms of overpressure as long as at least one end of the reactor is not blocked.

show abstract

Section: Resultsmentioning

confidence: 99%

Guidance on Safety/Health for Process Intensification including MS Design; Part I: Reaction Hazards

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Generally speaking, intensified heat-exchanger/ reactor is treated as similar to a continuous reactor as suggest in [1,8], then flow modelling is therefore based on the same hypothesis as the one used for the modelling of real continuous reactors, represented by a series of N perfectly stirred tank reactors (cells). According to [19,20], the number of cells N should be greater than the number of heat transfer units, and the heat transfer units is related to small heat capacity flowrate.…”

Section: Process Modellingmentioning

confidence: 99%

Actuator gain fault diagnosis for heat-exchanger/reactor

Li¹,

Dahhou²,

Zhang³

et al. 2015

2015 Chinese Automation Congress (CAC)

Self Cite

View full text Add to dashboard Cite

This paper deals with fault detection and diagnosis (FDD) of actuator gain occurring abruptly and incipiently for intensified continuous heat-exchanger/ reactor, meanwhile, occasion whereby system is subjected to either model uncertainties or external disturbance is discussed. The proposed algorithm is based on adaptive updating rules which not only decreases the computational burden, but also gives significantly better parameter identification and robustness properties. Effectiveness of the proposed approach is demonstrated on an intensified HEX reactor developed by the Laboratoire de Génie Chimique (LGCToulouse, France.

show abstract

“…With respect to the above results, fault symptoms can be detected without having the capability to pinpoint the root causes of these faults. For example, Benaïssa et al (2008) show that decrease of measured temperature in HEX/reactor may be due to decrease of fluid flowrate, this implies an actuator fault. With the help of above FDD algorithms, we can detect and isolate the actuator fault, but fail to realise the root cause of the fault in that particular actuator.…”

Section: Introductionmentioning

confidence: 99%

Root cause analysis of actuator fault based on invertibility of interconnected system

Zhang

Cabassud

et al. 2017

IJMIC

Self Cite

View full text Add to dashboard Cite

This paper addresses the problem of root cause analysis (RCA) of actuator fault. By considering an actuator as an individual dynamic subsystem connected with process dynamic subsystem in cascade, an interconnected system is then constituted. The fault detection and diagnosis (FDD) algorithm is carried out in actuator subsystem and aims at identifying the root causes of actuator faults. According to real plant, outputs of the actuator subsystem are assumed inaccessible and are reconstructed by measurements of the global system, thus providing a means of monitoring and diagnosis of the plant at both local and global level. A condition of invertibility of the interconnected system is first developed to guarantee that faults occurring in the actuator subsystem will affect the measured output of the global system distinguishably. For that, a necessary and sufficient condition is proposed to ensure invertibility of the interconnected system. Effectiveness of the proposed approach is demonstrated on an intensified HEX reactor.

show abstract

Evaluation of an intensified continuous heat-exchanger reactor for inherently safer characteristics

Cited by 28 publications

References 14 publications

Guidance on Safety/Health for Process Intensification including MS Design; Part I: Reaction Hazards

Guidance on Safety/Health for Process Intensification including MS Design; Part I: Reaction Hazards

Actuator gain fault diagnosis for heat-exchanger/reactor

Root cause analysis of actuator fault based on invertibility of interconnected system

Contact Info

Product

Resources

About