Navigation

Flows with Chemical Reactions

Dr.-Ing. Vojislav Jovicic

  • Job title: Leiter Bereich 2: Strömungen mit chemischen Reaktionen
  • Phone number: +49 9131 85-29492
  • Email: vojislav.jovicic@fau.de

Dr.-Ing. Ana Zbogar-Rasic

Pictures from combustion laboratory

Top: non-thermal (cold) plasma; Bottom: View into the novel baking oven with porous volumetric ceramic burners

Research group B2 Flows with Chemical Reactions – Combustion Technology was established as a part of LSTM in 1996. Research conducted by the B2 group is strongly application oriented and includes experimental research of flows with chemical reactions, as well as heat and mass transfer processes, all supported through virtual engineering and numerical simulations (CFD).

The most technically important representative of flows with chemical reactions are combustion processes, which represent the main research area of the B2 group. Different technologies have been developed here, from initial research to their technical implementation. The so-called volumetric ceramic burner technology (also known as porous burner technology) was developed at LSTM, it has been continuously optimized and adapted to a wide variety of applications, including steel, glass and food industry. Other important research point is investigation of non-thermal plasma, e.g. for water remediation and surface cleaning.

  • LOHCmobil - H2 Verbrenner/ Konstruktion und Erprobung des volumetrischen keramischen Brenners
    (Third Party Funds Single)
    Term: 1. January 2018 - 30. June 2020
    Funding source: Bundesministerium für Wirtschaft und Technologie (BMWi)
    Das Ziel des Projekts ist die Entwicklung eines deutlich kompakteren und dynamischeren Wasserstoff-Freisetzungsverfahrens auf Basis eines volumetrisch-keramischen Brenners mit entsprechendem Kesselsystem zum Einsatz in stationären und mobilen Wasserstofffreisetzungsanlagen und dessen allgemeingültige effiziente Integration und Anpassung in diese Anlagen, um die Kommerzialisierung der Wasserstoffspeicherung in LOHC im Markt voran zu treiben. Das neue Verfahren soll den Eigenverbrauch an Wasserstoff für die Verbrennung bei einer 100 kW Wasserstofffreisetzungsanlage von derzeit etwa 45 kW auf insgesamt angestrebte 30 kW reduzieren. Zudem soll das neue Verfahren deutlich kompakter und dynamischer sein als derzeit auf dem Markt vorhandene Brennersysteme. Die ermöglichten, schnellen Lastwechsel sollen die Integration in mobile Anwendungen ermöglichen.

  • Systematische Untersuchungen zur Einsatzqualifizierung einer innovativen Backofentechnik mit volumetrischem keramischem Brenner (VKB) einstellbaren Wellenlängenspektrums sowie hoher Regeldynamik und Energieeffizienz
    (Third Party Funds Single)
    Term: 1. May 2014 - 30. April 2017
    Funding source: AIF Arbeitsgemeinschaft industrieller Forschungsvereinigungen

    As part of this
    research project, a possibility of application of a novel gas-fired baking oven
    technology is to be developed, in which for the first time in the food industry
    a volumetric ceramic burner (VCB) is to be used. In many other industrial
    fields, VCB systems have demonstrated superior energy utilization and process
    ecology. A VCB-based baking oven technology combines the benefits of energy
    transfer, primarily due to thermal radiation, with a broad power modulation
    range. Thus, it promises not only the possibility of influencing the wavelength
    spectrum and its radiation intensity, but also an otherwise unattainable
    control dynamics, which is needed for the design and implementation of various
    baking programs, and the resulting increased energy efficiency. A VCB-based gas-fired
    baking oven technology therefore offers particular advantages to small and
    medium-sized enterprises (SMEs), which frequently vary their product range and production
    capacities.
    The baking oven type, the design of the thermal energy supply system, the
    moisture content in the baking oven and the baking time have a decisive effect
    on the resulting mass and energy transport conditions. However, there is a lack
    of knowledge about required optimal process conditions. Experimental studies
    have shown the positive influence of thermal radiation on the baking process, e.g.
    reduction of energy required for the baking process and improvement of transferred
    thermal energy control and regulation. In this regard, there are so far
    insufficient data regarding the optimal wavelength range for baking purposes.
    The aim of this research project is development and operational qualification
    for a novel gas-fired baking oven concept based on a volumetric ceramic burner.
    Potential for application of this technology requires a critical evaluation of
    the operating window in interaction with product properties and process
    parameters. An additional goal is to explore which process conditions can be
    realized in the novel gas-fired furnace through the specific use of the
    innovation-bearing characteristics, its control and wide dynamic power
    modulation range and increased energy efficiency. The interdisciplinary project
    is intended to create the basis for a fast and broad transfer of an innovative
    baking technology and is thus of relevance to both companies in the field of baking
    oven construction and users in the baking industry. In particular, SMEs will
    benefit from the results, as their competitiveness can be increased by cost
    savings of 20 to 30% of energy costs for baking processes.

Topics, currently or previously addressed in projects, include:

  • burners and combustion systems,
  • porous volumetric ceramic burner technology,
  • combustion of hydrogen and of low calorific gases,
  • heating systems,
  • industrial combustion units,
  • biomass gasification,
  • drying facilities,
  • steam generators,
  • thermal energy recovery from exhaust gases,
  • flue gas treatment,
  • fuel cells,
  • hot jets,
  • non-thermal (cold) plasma applications,
  • wastewater treatment,
  • investigation of high-temperature resistant ceramics,
  • numerical simulations of flows and of combustion processes,
  • development of sensors and measurement systems, etc.

Experimental facilities:

  • Five laboratories for the experimental research, including three bunker laboratories,
  • Three gas analyzers (for O2, CH4, CO2, CO, NO, NOx, etc.)
  • FID – analyzer (C3 equivalent)
  • Thermography system (50 Hz)
  • IR Color (Dual frequency) Pyrometer
  • 16 long-term test setups for burners (24/7 use)
  • High temperature furnace TMAX = 1750°C
  • Vacuum and atmospheric plasma generator

Numerical simulations are used in addition to the experimental investigation, by means of various commercial and open source simulation codes.

2019

2018

2017

2016

2015

2014

2013

2011

2010