FG Dynamik und Betrieb technischer Anlagen

30 Items

Recent Submissions
Evaluation of different pre-treatments of chromium leather waste and their use in biogas production

Scaraffuni Gomes, Carolina (2020)

The worldwide economic importance of the leather industry is undeniable, as it converts a by-product of the meat industry, the hides, into a value-added product. However, processing of leather generates thousands of tons of new solid waste annually and, unlike hides, this waste has a low biodegradability. Usually, the tanning process is carried out using basified trivalent chromium salts. As a ...

MOSAICmodeling PlantDesign

Fillinger, Sandra (2020)

Considering the volatile macro-economic environment aggravating competitiveness in the increasingly globalizing market the most important challenge facing industrial companies is to achieve an innovation lead with high quality and reliability with shortened innovation cycles. For the entire life cycle of chemical plants, several stakeholders, such as owners, operators, vendors, and contractors,...

Kinetische Parameteridentifikation und Modelldiskriminierung am Beispiel der nassen Oxidation von Thiosulfat

Holz, Stephan ; Stewers, Lennart ; Thielert, Holger ; Guetta, Zion ; Repke, Jens‐Uwe (2019-12-02)

In der Kokereitechnik fallen belastete Abwässer an, die effizient behandelt werden müssen, um die Umwelt nicht zu belasten und den gesetzlichen Verordnungen gerecht zu werden. Hierzu ist ein genaues Prozessverständnis notwendig. Aufgrund der Vielzahl an möglichen Modifikationen nehmen Schwefelverbindungen eine Sonderstellung ein, weswegen die Kenntnis der verschiedenen Reaktionspfade und ‐kinet...

Investigation of the Degradation of Chelate Complexes in Liquid Redox Desulfurization Processes

Holz, Stephan ; Köster, Peter ; Thielert, Holger ; Guetta, Zion ; Repke, Jens-Uwe (2020-01-22)

Metal complexes such as Fe‐EDTA, which are used as pseudo‐catalysts or oxygen carriers in wet oxidative desulfurization processes, are subject to a degradation mechanism that significantly influences the economics of such processes. Therefore, this study presents a methodology for determining the degree of degradation during the reactive hydrogen sulfide absorption in a Fe‐EDTA solution within ...

Heat transfer between a rolling sphere and a solid wall

Brösigke, Georg Tobias (2020)

The heat transfer between particles and walls has been topic of research for several decades. In most cases existing correlations were developed empirically for special conditions and applications like fluidised beds or rotary kilns. With a deeper fun- damental understanding of the occurring heat transfer mechanisms both design of existing and development of innovative apparatuses, could be mor...

Controlling sliding droplets with optimal contact angle distributions and a phase field model

Bonart, Henning ; Kahle, Christian ; Repke, Jens-Uwe (2019-11-18)

We consider the optimal control of a droplet on a solid by means of the static contact angle between the contact line and the solid. The droplet is described by a thermodynamically consistent phase field model from [Abels et al., Math. Mod. Meth. Appl. Sc., 22(3), 2012] together with boundary data for the moving contact line from [Qian et al., J. Fluid Mech., 564, 2006]. We state an energy stab...

Planare Laserinduzierte Fluoreszenz zur experimentellen Analyse des Gastransports in Filmströmungen in Anwesenheit einer einzelnen Mikrostruktur

Kapoustina, Viktoria (2019)

Im Rahmen der vorliegenden Arbeit wird, nach Wissen des Autors, erstmalig der Einfluss einer einzelnen Mikrostruktur auf den lokalen Gas-Flüssig-Stofftransport experimentell beschrieben. Damit ist die Arbeit klar abzugrenzen von experimentellen Studien anderer Forschungsgruppen, die sich bislang ausschließlich mit der Analyse integraler Stofftransport-Parameter beschäftigen. Eine nicht-invasive...

Towards demand-side management of the chlor-alkali electrolysis: Dynamic, pressure-driven modeling and model validation of the 1,2-dichloroethane synthesis

Hoffmann, Christian ; Weigert, Joris ; Esche, Erik ; Repke, Jens-Uwe (2019-11-21)

A promising application of demand-side management is the chlor-alkali electrolysis. However, storing the produced chlorine for flexibility should be avoided whenever possible. If PVC is produced from chlorine, storing the intermediate 1,2-dichloroethane resulting from direct chlorination of ethene is a better alternative as it is less toxic than chlorine and can be easily stored. Currently, no ...

Sequential Flowsheet Optimization: Maximizing the Exergy Efficiency of a High-Pressure Water Scrubbing Process for Biogas Upgrade

Penteado, Alberto T. ; Schöneberger, Jan C. ; Esche, Erik ; Godini, Hamid Reza ; Wozny, Günter ; Repke, Jens-Uwe (2018-07-04)

Biogas is an important renewable energy source and potential raw material for the chemical industry. Its utilization frequently requires a treatment and/or upgrade step. The aim here is to maximize the exergy efficiency of a high-pressure water scrubbing process for upgrading biogas into biomethane by coupling a sequential modular simulation flowsheet with different optimization algorithms. By ...

Improving Convergence Behavior of Nonlinear Equation Systems in Intensified Process Models by Decomposition Methods

Bublitz, Saskia ; Esche, Erik ; Tolksdorf, Gregor ; Repke, Jens-Uwe (2018-07-04)

The two decomposition methods Dulmage-Mendelsohn (DM) decomposition and bordered block transformation (BBTF) have been examined on their capabilities to eliminate convergence problems during the iteration of large, nonlinear equation systems as they occur frequently in process modeling. They both divide the overall system into lower dimensional subsystems, which can be solved separately in sequ...

A Discrete-time Scheduling Model for Continuous Power-intensive Processes Considering Fatigue of Equipment

Obermeier, Andreas ; Windmeier, Christoph ; Esche, Erik ; Repke, Jens-Uwe (2018-07-04)

In the light of the growing renewable energy generation, matching of electricity supply and demand has become increasingly challenging. By participating in demand side management programs, industry can contribute to counter this challenge. However, the frequent adjustment of operation conditions according to volatile electricity prices leads to additional dynamic loads for the equipment. In thi...

The Systematic Design of CO2 Capture Processes Applied to the Oxidative Coupling of Methane

Penteado, Alberto ; Esche, Erik ; Salerno, Daniel ; Godini, Hamid Reza ; Repke, Jens-Uwe ; Wozny, Günter (2016-08-26)

The oxidative coupling of methane is the catalytic conversion of methane into ethene. Carbon dioxide is generated as a reaction by-product and must be removed from the gaseous stream. In this paper, the application of a hybrid carbon dioxide removal process including absorption with amines and gas separation membranes is investigated through simulations and cost estimations.

Hydoformylation of 1-Dodecene in Microemulsions: Operation and Validation of Lab Results in a Miniplant

Illner, Markus ; Pogrzeba, Tobias ; Schmidt, Marcel ; Müller, David ; Esche, Erik ; Schomäcker, Reinhard ; Repke, Jens-Uwe ; Wozny, Günter (2016-08-26)

A method of hydroformylation to convert long- chained olefins, using tunable microemulsion systems, tests were conducted on a mini-plant at the center InPROMPT/TRR 63. Surfactant allowing a quasi-homogeneous reaction of olefin in aqueous Rhodium catalyst solution.

Dynamic Modelling and Operation of the Chlor-Alkali Process

Budiarto, Thomas ; Esche, Erik ; Repke, Jens-Uwe (2016-08-26)

Chlorine it is commonly produced through the Chlor-alkali process, which is an electrochemical process – the process energy consumption dominates the production cost. Therefore, optimization of the process has become a major issue to achieve energy conservation and cost effective production. This study aims at investigating the transient and steady-state behavior of the chlorine production syst...

Development of a Mobile Pilot Plant for the Evaluation of Novel Scrubbing Liquids for the Absorption of CO2 From Industrial Gases

Wilhelm, Robert ; Esche, Erik ; Wozny, Günter ; Repke, Jens-Uwe ; Guetta, Zion ; Thielert, Holger (2016-08-26)

Most available scrubbing liquids suffer from either high heating duties for the regeneration or vulnerability towards gas components. In order to increase the efficiency of the absorption process a novel scrubbing liquid has been developed by thyssenkrupp Industrial Solutions AG. For verifying relevance and feasibility of long-term operation of the new fluid assumptions for installation were cr...

Model Adaptation and Optimization for the Evaluation and Investigation of Novel Amine Blends in a Pilot-plant Scale CO2 Capture Process under Industrial Conditions

Wilhelm, Robert ; Esche, Erik ; Guettab, Zion ; Menzel, Johannes ; Thielert, Holger ; Repke, Jens-Uwe (2018-10)

Carbon capture processes are highly energy intensive and the main driving force during the process design is the necessity to reduce the energy consumption for the solvent regeneration. The energy efficiency of absorption desorption processes is driven by the plant design and operation conditions, but also to a large extent by the choice of the scrubbing liquid (Wang et al., 2011). Absorbent sc...

Development of a State Estimation Environment for the Optimal Control of a Mini-plant for the Hydroformylation in Microemulsions

Weigert, Jonas ; Illner, Markus ; Esche, Erik ; Repke, Jens-Uwe (2018-08)

A state estimation framework for a surfactant containing multiphase process for the hydroformylation of longchained alkenes is presented. Firstly, available state estimation methods, such as the extended Kalman filter, the unscented Kalman filter and the particle filter are compared regarding their usability in processes with high model and measurement uncertainty. Subsequently, an MHE-based st...

Biogas as a Renewable Feedstock for Green Ethylene Production via Oxidative Coupling of Methane: Preliminary Feasibility Study

Penteado, Alberto T. ; Kim, Mijin ; Godini, Hamid R. ; Esche, Erik ; Repke, Jens-Uwe (2017-10)

A preliminary feasibility study for the use of biogas as feedstock for the oxidative coupling of methane process aiming at green ethylene production is carried out. An economic assessment is performed based on literature, market and process simulation data, with the uncertainties being considered through Monte Carlo simulations. It is shown that the proposed process is economically interesting ...

Automatic Decomposition of Nonlinear Equation Systems for Improved Initialization and Solution of Chemical Engineering Process Models

Esche, Erik ; Bublitz, Saskia ; Tolksdorf, Gregor ; Repke, Jens-Uwe (2018-08-02)

The initialization of process models for chemical engineering systems is often a challenge. While dedicated strategies exist for state of the art column models, novel models need to be initialized manually. In this contribution, we present a first application of these decomposition methods for supporting the initialization and solution of equilibrium- and non-equilibrium-type column models for ...

Optimal Control of Surfactant containing Multiphase Systems – Challenges and Solution Strategies for a stable Mini-Plant Operation

Illner, Markus ; Esche, Erik ; Repke, Jens-Uwe (2018-08-02)

In this contribution, a model-based approach for the control and stable operation of a mini-plant for homogeneously catalysed reactions in microemulsions is presented. Within these systems, the control of the crucial reaction and phase separation steps is hindered by sensitive shifting operation windows and immeasurable concentrations. Combining the optical observation of the separation state a...