Měření tepelných toků v procesních zařízeních - případová studie

Heat Flux Measurement Methods for Process Furnaces – a Case Study

journal article - other

en

The distribution of heat loads to heat exchanging surfaces in process furnaces (fired heaters, boilers) is an important factor influencing efficiency of the process as well as lifetime of the unit. This work compares two heat flux measurement methods in a controlled environment of large-scale laboratory combustion facility. The experiment makes use of a low-NOx burner firing natural gas at 745 kW thermal duty. Heat fluxes are measured firstly by a water-cooled Schmidt-Boelter sensor (Hukseflux SBG01), which represents the typical approach applied in industrial practice. Second method is based on segmental design of water- cooled walls of the combustion chamber. The latter method provides total heat flux measurement on the process medium side and has several advantages over the standard method. This paper provides a comparison of heat flux distributions measured by the two methods as well as a quantitative analysis of the strong and weak points of both methods. Researchers and practitioners alike should find this paper helpful in interpretation of measured heat flux data.

Rozložení tepelného zatížení stěn v procesních pecích je důležitým paramterem ovlivňujícím účinnost a životnost zařízení. Tato práce porovnává dva přístupy k měření tepelných toků na spalovacím zařízení. Při testech byl využit nízkoemisní hořák na zemní plyn s výkonem 745 kW. Tepelné toky jsou měřeny vodou chlazenou sondou typu Schmidt-Boelter (Hukseflux SBG01), jež představuje typický přístup běžný v technické praxi. Dalším typem měření využívá segmentového rozdělení vodou chlazeného pláště komory. Tato metoda poskytuje údaje o celkovém předaném teple na straně procesního média a má několik předností ve srovnání se standardní metodou.

The distribution of heat loads to heat exchanging surfaces in process furnaces (fired heaters, boilers) is an important factor influencing efficiency of the process as well as lifetime of the unit. This work compares two heat flux measurement methods in a controlled environment of large-scale laboratory combustion facility. The experiment makes use of a low-NOx burner firing natural gas at 745 kW thermal duty. Heat fluxes are measured firstly by a water-cooled Schmidt-Boelter sensor (Hukseflux SBG01), which represents the typical approach applied in industrial practice. Second method is based on segmental design of water- cooled walls of the combustion chamber. The latter method provides total heat flux measurement on the process medium side and has several advantages over the standard method. This paper provides a comparison of heat flux distributions measured by the two methods as well as a quantitative analysis of the strong and weak points of both methods. Researchers and practitioners alike should find this paper helpful in interpretation of measured heat flux data.

CFd, vířivé proudění, spalování, vířič

CFD, Swirl flow, Combustion, Swirler

2013

29.09.2013

AIDIC Servizi S.r.l.

Milano, Italy

1974-9791

35

1

1153–1158

6