Detail publikačního výsledku

Optimization of Secondary Air Distribution in Biomass Boiler by CFD Analysis

LISÝ, M.; POSPÍŠIL, J.; ŠTELCL, O.; ŠPILÁČEK, M.

Original Title

Optimization of Secondary Air Distribution in Biomass Boiler by CFD Analysis

English Title

Optimization of Secondary Air Distribution in Biomass Boiler by CFD Analysis

Type

Peer-reviewed article not indexed in WoS or Scopus

Original Abstract

This paper deals with a use of CFD modelling for optimization of supply of secondary combustion air in the two-chamber biomass boiler combusting very wet biomass (capacity ca. 200 kW). Objective of the analysis is to observe the impact of a diameter of a secondary air supply pipe and air flow velocity on mixing of the secondary air with flue gas in the combustion chamber. The numerical model of the experimental boiler was built for subsequent utilization of CFD computation based on the finite element method. The commercial code STAR-CD was used for development of parametrical studies. Series of calculations were carried out for four different diameters of air distribution pipes and for three different air velocities in a distribution orifice. Quality of air dispersion in flue gas flow was assessed in the vertical cross section lead at the end of the combustion chamber. The results of calculation were verified on the experimental installation of the boiler. Influence of secondary air mixing on emission production was measured and analysed. Emissions of pollutants for recommended air distribution comply with emission limits stipulated in the most stringent class 5 according to ČSN-EN 303-5 as well as with emission limits under Regulation No. 405/2012 Sb.

English abstract

This paper deals with a use of CFD modelling for optimization of supply of secondary combustion air in the two-chamber biomass boiler combusting very wet biomass (capacity ca. 200 kW). Objective of the analysis is to observe the impact of a diameter of a secondary air supply pipe and air flow velocity on mixing of the secondary air with flue gas in the combustion chamber. The numerical model of the experimental boiler was built for subsequent utilization of CFD computation based on the finite element method. The commercial code STAR-CD was used for development of parametrical studies. Series of calculations were carried out for four different diameters of air distribution pipes and for three different air velocities in a distribution orifice. Quality of air dispersion in flue gas flow was assessed in the vertical cross section lead at the end of the combustion chamber. The results of calculation were verified on the experimental installation of the boiler. Influence of secondary air mixing on emission production was measured and analysed. Emissions of pollutants for recommended air distribution comply with emission limits stipulated in the most stringent class 5 according to ČSN-EN 303-5 as well as with emission limits under Regulation No. 405/2012 Sb.

Keywords

CFD analysis, secondary air, flow, mixing, concentration

Key words in English

CFD analysis, secondary air, flow, mixing, concentration

Authors

LISÝ, M.; POSPÍŠIL, J.; ŠTELCL, O.; ŠPILÁČEK, M.

RIV year

2017

Released

01.04.2016

Publisher

Trans Tech Publications, Switzerland

Location

Švýcarsko

ISBN

1662-7482

Periodical

Applied Mechanics and Materials

Volume

832

Number

1

State

Swiss Confederation

Pages from

231

Pages to

237

Pages count

7

Full text in the Digital Library

http://hdl.handle.net/

BibTex

@article{BUT122916,
  author="Martin {Lisý} and Jiří {Pospíšil} and Otakar {Štelcl} and Michal {Špiláček}",
  title="Optimization of Secondary Air Distribution in Biomass Boiler by CFD Analysis",
  journal="Applied Mechanics and Materials",
  year="2016",
  volume="832",
  number="1",
  pages="231--237",
  doi="10.4028/www.scientific.net/AMM.832.231",
  issn="1662-7482"
}