AN INTEGRATED MODEL TO STUDY THE EFFECTS OF OPERATIONAL PARAMETERS ON THE PERFORMANCE AND POLLUTANT EMISSIONS IN A UTILITY BOILER

Hamid ABROSHAN

doi:https://doi.org/10.18186/thermal.764157

Article Details

AN INTEGRATED MODEL TO STUDY THE EFFECTS OF OPERATIONAL PARAMETERS ON THE PERFORMANCE AND POLLUTANT EMISSIONS IN A UTILITY BOILER

Authors:

Hamid ABROSHAN

Publisher:

Yildiz Technical University

Main Topics:

Applied physics

Journal:

Journal of Thermal Engineering 2020 Vol.6 Issue 4, pp.474-498

Document Type:

Article

Publication Date:

6/2020

Document Language:

English

Document ID (Org No.):

2000505582

Frequency:

Bimonthly

eISSN:

2148-7847

DOI:

https://doi.org/10.18186/thermal.764157

Abstract:

 

A gas fired tangentially boiler was modeled under full load conditions. Furnace was simulated by CFD and then was joint with two mathematical models to calculate heat transfer in the convective section, and metal temperature of waterwall tubes. Effects of changing the combustion excess air (0 to 20%) and burners tilt angle (-30° to +30°) were studied. Results showed that the boiler efficiency is optimum if excess air= 10% and the burners have a negative angle. However, these optimum settings cannot produce a superheated and reheated steam of 538 °C which is desirable. Indeed, a zero or positive tilt angle with 10% excess air, or a negative burner angle with 15% excess air lead to highest efficiency by considering the potential of generating superheated steam of 538 °C. In addition, CO emission in low excess air values growths by increasing the burner tilt angle. NOx emission in low and high excess air ratios is lower at positive burner angles while a moderate excess air (10%) needs a zero tilt angle to minimize NOx emission. Furthermore, a critical fouling thickness was computed, considering boiler's circulation ratio, in which the metal temperature of the waterwall exceeds the short overheating threshold. With a certain thickness of scale layers inside the tubes, a burner tilting equal to 0° or 30° postpones tube rupture. These results could be utilized by operating engineers to keep their utility boilers in the most efficient state and avoiding overheating and tube rupture.

Article Details

AN INTEGRATED MODEL TO STUDY THE EFFECTS OF OPERATIONAL PARAMETERS ON THE PERFORMANCE AND POLLUTANT EMISSIONS IN A UTILITY BOILER

Authors: Hamid ABROSHAN

Publisher: Yildiz Technical University

Main Topics: Applied physics

Journal: Journal of Thermal Engineering 2020 Vol.6 Issue 4, pp.474-498

Document Type: Article

Publication Date: 6/2020

Document Language: English

Document ID (Org No.): 2000505582

Frequency: Bimonthly

eISSN: 2148-7847

DOI: https://doi.org/10.18186/thermal.764157

Issues

Authors:

Hamid ABROSHAN

Publisher:

Yildiz Technical University

Main Topics:

Applied physics

Journal:

Journal of Thermal Engineering 2020 Vol.6 Issue 4, pp.474-498

Document Type:

Article

Publication Date:

6/2020

Document Language:

English

Document ID (Org No.):

2000505582

Frequency:

Bimonthly

eISSN:

2148-7847

DOI:

https://doi.org/10.18186/thermal.764157