Investigation of Turbulators for Fire Tube Boilers Using Exergy Analysis

Betül AYHAN

Makale detayları

Investigation of Turbulators for Fire Tube Boilers Using Exergy Analysis

Yazarlar:

Betül AYHAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Engineering and Environmental Sciences 2001 Vol.25 Issue 4, pp.249-258

Belge Tipi:

Makale

Yayın Tarihi:

3/2001

Belge Dili:

Türkçe

Document ID (Org No.):

2000745238

Sıklık:

Üç Yıllık

eISSN:

1303-6157

pISSN:

1300-0160

Özet:

 

In this paper, an experimental study of five different types of  turbulator" inserts for fire tube boilers is presented.  The  experimental setup was constructed in the Department of Mechanical  Engineering Laboratory of Karadeniz Technical University.  It was  tested to evaluate the boiler efficiency according to TS 4040  standard, and to evaluate the second law efficiency of thermodynamics  for the cases with and without inserts under the same operating  conditions.  Four new types of turbulator consisted of truncated  hollow cones.  They were placed in tandem parallel to the gas flow  direction to allow no contact with the fire tube wall.  The half-apex  angles of the conical turbulators used in the experiments were  14o and 20o.  The number of the turbulators inserted  in the of the boiler was 200, their installation arrangements in the  fire tubes were periodic, and their enlarging positions were in  accordance with the gas flow direction.  It was found that turbulators  increased the boiler efficiency from 8% to 12% and the second law  efficiency of the boiler from 24% to 27%.  It is also shown that the  one with the half-apex angle of 20o gives better results,  about 4% enhancement compared with the other ones.  A fifth new  turbulator, consisting of a truncated half-cylindrical surface and  placed in tandem with flow direction, also periodically interrupted  and transposed in the fire tube boilers, provided a 4% increase in  the boiler efficiency.  The second law efficiency of the boiler was  improved from 24% to 25.2%.  It was also shown that there was no  need to use an excess fan for the flue gas in the chimney because of  the very low pressure drops in the new types of turbulator.

 

In this paper, an experimental study of five different types of  turbulator" inserts for fire tube boilers is presented.  The  experimental setup was constructed in the Department of Mechanical  Engineering Laboratory of Karadeniz Technical University.  It was  tested to evaluate the boiler efficiency according to TS 4040  standard, and to evaluate the second law efficiency of thermodynamics  for the cases with and without inserts under the same operating  conditions.  Four new types of turbulator consisted of truncated  hollow cones.  They were placed in tandem parallel to the gas flow  direction to allow no contact with the fire tube wall.  The half-apex  angles of the conical turbulators used in the experiments were  14o and 20o.  The number of the turbulators inserted  in the of the boiler was 200, their installation arrangements in the  fire tubes were periodic, and their enlarging positions were in  accordance with the gas flow direction.  It was found that turbulators  increased the boiler efficiency from 8% to 12% and the second law  efficiency of the boiler from 24% to 27%.  It is also shown that the  one with the half-apex angle of 20o gives better results,  about 4% enhancement compared with the other ones.  A fifth new  turbulator, consisting of a truncated half-cylindrical surface and  placed in tandem with flow direction, also periodically interrupted  and transposed in the fire tube boilers, provided a 4% increase in  the boiler efficiency.  The second law efficiency of the boiler was  improved from 24% to 25.2%.  It was also shown that there was no  need to use an excess fan for the flue gas in the chimney because of  the very low pressure drops in the new types of turbulator.

Makale detayları

Investigation of Turbulators for Fire Tube Boilers Using Exergy Analysis

Yazarlar: Betül AYHAN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Engineering and Environmental Sciences 2001 Vol.25 Issue 4, pp.249-258

Belge Tipi: Makale

Yayın Tarihi: 3/2001

Belge Dili: Türkçe

Document ID (Org No.): 2000745238

Sıklık: Üç Yıllık

eISSN: 1303-6157

pISSN: 1300-0160

Sayı

Yazarlar:

Betül AYHAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Engineering and Environmental Sciences 2001 Vol.25 Issue 4, pp.249-258

Belge Tipi:

Makale

Yayın Tarihi:

3/2001

Belge Dili:

Türkçe

Document ID (Org No.):

2000745238

Sıklık:

Üç Yıllık

eISSN:

1303-6157

pISSN:

1300-0160