FlexHEAT

Specific Targeted Research Project

financially supported by

the European Commission

in the framework of

International Cooperation activities in FP6 (INCO)

Project Description

The FlexHEAT project is aimed at developing low-cost, fuel-flexible, efficient and low-polluting premix burners for domestic heating systems via fully-validated advanced modelling and design tools. Low cost and fuel flexibility are essential features to achieve a wide market penetration of this advanced technology in the Western Balkans, where the natural gas composition changes remarkably from site to site and in time.

The major targets of the FlexHeat project are as follows:

Firstly, the development of a 1:3 power modulating atmospheric premix metal burner with no water cooling, an optimised material composition and pollutants emissions lower than 50 mg/kWh. State of the art burners enable a 1:2.5 power modulation only with water cooling of the burner-mantle for the flame stabilisation.

Secondly, the development of a 1:5 power modulating (fan-assisted) fully-premixed metal burner with an optimised material composition and pollutants emissions lower than 40 mg/kWh. Reliable state of the art burners with these characteristics are mainly manufactured with very high material costs.

Additionally, enhanced fuel flexibility, i.e. the capability of handling different feed gases (from natural gas, LPG, renewables as biogas, low heating value gas from the Western Balkans, etc.) and reliability of the two different burners will be achieved.

For the design of the burner geometry and the slits-and-holes shape and pattern, a fully-validated modelling/design platform will be deployed, based on combined CFD modelling of flames and finite-elements modelling of the burners' stress and strain. Pollutants emission, flame stability and noise generation will be analysed as well.


The model validation will be performed in specific test rigs and in real appliances (validators), assembled and tested by the end-users, where the above targets will be demonstrated.

Project Partners

The consortium includes one Dutch burner manufacturer, two industrial domestic heat appliances manufacturers from Serbia & Montenegro, five academic partners from Bosnia & Herzegovina, Serbia & Montenegro, Portugal, Italy and Germany. The academic partners are mainly devoted to modelling studies and to the development of an advanced design tool for metallic slits and holes premix burners.

The following table lists the FlexHEAT partners along with their nations and specific role in the project.

Table 1: FlexHEAT participants list
Participant's Role
Participant's No.
Participant' Name
Participant's short name
Country
Work Package
Coordinator
1
Friedrich-Alexander-Universität Erlangen-Nüremberg
UERLN
Germany

Coordination and Management

Modelling

Burner Prototyping and Testing

Contractor
2
Metalna industrija „Alfa-Plam“ A.D. Vranje
ALFA PLAM
Serbia & Montenegro
Validator 1 Assembly and Testing
Contractor
3
EUROTEH-GAS DOO
EUROTEH-GAS
Serbia & Montenegro
Validator 2 Assembly and Testing
Contractor
4
Faculty of Mechanical Engineering Belgrade
MFB
Serbia & Montenegro
Modelling

Burner Prototyping and Testing

Contractor
5
Faculty of Mechanical Engineering Banja Luca
MEF-BL
Bosnia & Herzegovina
Modelling
Contractor
6
Bekaert Combustion Technology B.V.
BCT
Netherlands
Burner Mantle Design and Manufacturing

Burner Prototyping and Testing

Contractor
7
Politecnico di Torino
POLITO
Italy
Burner Material Development
Contractor
8
Instituto Superior Técnico
IST
Portugal
Burner Prototyping and Testing

Publications

Publishable executive summary:

Overview and achievements of the FlexHEAT tasks:

Conferences Abstracts

  • Clean Air, 2-4 July 2007, Povoa de Varzim, Portugal

    Conference: Ninth International Conference on Energy for a Clean Environment
    Date: 2-4 July 2007
    Location: Povoa de Varzim - Portugal

    INVESTIGATION OF DESIGN PARAMETERS INFLUENCING THE PERFORMANCE OF PREMIXED SURFACE BURNERS

    Authors:
    A. Zbogar-Rasic (1), M. Altendorfner (1), M. Steven (1), F. von Issendorff (1), D. Trimis (2)
    (1) INSTITUTE OF FLUID MECHANICS - University of Erlangen-Nuremberg, Erlangen, Germany
    (2) INSTITUTE OF GAS AND HEAT TECHNOLOGY - Technical University Bergakademie Freiberg, Freiberg, Germany

    Abstract

    While fully premixed burners have the advantage of low NO emissions, compared to diffusion and partially premixed burners, fully premixed combustion is sensitive towards flame instabilities, i.e. flash-back, blow-off and acoustical emissions. These instabilities limit the power modulation of a burner, thus decreasing its application range and potentials on the gas appliances market.

    This investigation is focused on the performance of fully premixed gas burners with a perforated surface pattern (slits-and-holes). Influences of the burner surface pattern design and the burner mantel shape on the burner operation were investigated. Experiments showed that the surface pattern design has strong influence the burner power modulation range and the emission of pollutants (CO, NO).

    Visualization and numerical simulation of the cold flow through a perforated surface pattern indicate that the dimensions of the flow recirculation zone in the vicinity of the slits/holes outlet are responsible for the quality of flame stabilization. Improved power modulation range can thus be achieved by improved flow distribution through redesigning the burner surface pattern.

    Keywords:

    Premixed burners, flame stability, modulation, emissions
  • German Flame Day, 12-13 September 2007, Berlin, Germany

    Conference: 23rd German Flame Day
    Date: 12-13 September 2007
    Location:Berlin - Germany

    EXPERIMENTAL AND NUMERICAL OPTIMIZATION OF THE BURNER MANTEL DESIGN OF THE PREMIXED HOUSEHOLD BURNERS

    Authors:
    A. Zbogar-Rasic, M. Steven, Dr. F. von Issendorff, Institute of Fluid Mechanics, University of Erlangen-Nuremberg, Erlangen
    Prof. Dr. D. Trimis, Institute of Gas and Heat Technology, Technical University Bergakademie Freiberg, Freiberg

    Abstract

    Fully premixed atmospheric burners exhibit lower CO and NOx emissions compared to partially premixed atmospheric burners. However, fully premixed burners show a higher tendency towards flame instabilities, i.e. flash-back, blow-off and acoustical problems. These instabilities limit the application range of this burner type, thus decreasing its potentials on the gas appliances market.

    In the case of multiport burners the operational range of a burner and its emission characteristics depend on flow-, and consequently on flame distribution over the burner ports. In order to optimize the operation of a fully premixed, multiport atmospheric burner, the influence of the burner mantel length on the flow distribution over the burner surface pattern was numerically investigated. The influence of the elongation of the burner mantel on the flame distribution and the entrainment of primary air were further tested experimentally.

    Keywords:

    Premixed burners, flame stability, primary air entrainment, optimization

Partners

FAU Erlangen-Nürnberg - Lehrstuhl für Strömungsmechanik
Dimosthenis Trimis
Lehrstuhl für Strömungsmechanik
Cauerstr. 4
91058 Erlangen

Germany

Tel.:
+49-9131-85-29490
Fax:
+49-9131-85-29503
E-Mail:
dimos.trimis@lstm.uni-erlangen.de
WWW:
www.lstm.uni-erlangen.de

A.D. metalna industrija "Alfa plam" Vranje
Srboljub Pesic
New Product Development
Radnicka 1
YU-17500 Vranje
Serbia & Montenegro
Tel.:
+381-17-427065
Fax:
+381-17-424808
E-Mail:
alfaplam@ptt.yu
WWW:
www.alfaplam.co.yu

Euroteh-Gas Ltd.
Ratko Popovic
P.Proleterska BB
YU-23000 Zrenjanin
Serbia & Montenegro
Tel.:
+381-23-541325
Fax:
+381-23-547013
E-Mail:
eurotehgas@mgnet.co.yu
WWW:
www.euroteh-gas.co.yu

Faculty of Mechanical Engineering Belgrade
Miroljub Adzic
27. marta 80
YU-11000 Belgrade
Serbia & Montenegro
Tel.:
+381-11-3370-299
Fax:
+381-11-3370-364
E-Mail:
mikce2001@yahoo.com
WWW:
www.mas.bg.ac.yu

Faculty of Mechanical Engineering Banja Luka
Petar M. Gvero
Department of Thermotechnics and Thermoenergetics
Stepe Stepanovica 75a
YU-78000 Banja Luka
Bosnia & Herzegovina
Tel.:
+387-51-468320
Fax:
+387-51-468696
E-Mail:
pero@urc.bl.ac.yu
WWW:
www.uni.bl.ac.yu

Bekaert Combustion Technology
Geert Folkers
Bekaert Combustion Technology B.V.
J.C. van Markenstraat 19
NL-9403 AR Assen
Postbus 123, NL-9400 AC Assen
Netherland
Tel:
+31-592 376 545
Fax:
+31-592 405 389
E-Mail:
geert.folkers@bekaert.com
WWW:
www.combustion-technology.com

Politecnico di Torino
Vito Specchia
Dep. of Materials Science and Chemical Engineering
Corso Duca Degli Abruzzi, 24
10129 Torino
Italy
Tel.:
+39-011 564 46 50
Fax:
+39-011 564 46 99
E-Mail:
specchia@polito.it
WWW:
http://www2.polito.it/strutture/dichi/

Instituto Superior Técnico
Edgar Caetano Fernandes
Department of Mechanical Engineering
Av.Rovisco Pais
PT-1096 Lisbon Codex
Portugal
Tel.:
+351-21 841 7790
Fax:
+351-21 849 6156
E-Mail:
ecfernandes@dem.ist.utl.pt
WWW:
www.ist.utl.pt