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 ENG  Vol.10 No.10 , October 2018
Evaluation of a Pulse Width Modulated Bypass Nozzle for the Development of a Variable Load Residential Oil Burner
Abstract: Due to the need for energy conservation in buildings and the simultaneous benefit of cost savings, the development of a low firing rate load modulating residential oil burner is very desirable. One of the two main requirements of such a burner is the development of a burner nozzle that is able to maintain the particle size distribution of the fuel spray in the desirable (small) size range for efficient and stable combustion. The other being the ability to vary the air flow rate and air distribution around the fuel nozzle in the burner for optimal combustion at the current fuel firing rate. In this paper, which deals with the first requirement, we show that by using pulse width modulation in the bypass channel of a commercial off-the-shelf bypass nozzle, this objective can be met. Here we present results of spray patterns and particle size distribution for a range of fuel firing rates. The results show that a desirable fuel spray pattern can be maintained over a fuel firing rate turndown ratio (Maximum Fuel Flow Rate/Minimum Fuel Flow Rate) of 3.7. Thus here we successfully demonstrate the ability to electronically vary the fuel firing rate by more than a factor of 3 while simultaneously maintaining good atomization.
Cite this paper: Drabo, M. , Tutu, N. , Butcher, T. , Wei, G. and Trojanowski, R. (2018) Evaluation of a Pulse Width Modulated Bypass Nozzle for the Development of a Variable Load Residential Oil Burner. Engineering, 10, 643-654. doi: 10.4236/eng.2018.1010047.
References

[1]   Krishna, C.R., Butcher, T.A. and Kamath, B.R. (2004) Variable Firing Rate Qil Burner Using Pulse Fuel Flow Control. Report # BNL-73723-2005-IR, Brookhaven National Laboratory, Upton, NY.

[2]   Juergen, K. (2002) Description of a New Nozzle for Variable Firing Rates. Proceedings of the 2002 National Oilheat Research Alliance Technology Symposium, Providence, RI, 20-21 August 2002, 183-187.

[3]   Drabo, M., Tutu, N., Butcher, T. and Trojanowski, R. (2016) Some Results of Flash Atomization in a Pressure Swirl Nozzle. International Journal of Modern Engineering, 16, 44-48.

[4]   Olson, E.O. Fuel Nozzles for Oil Burners, Technical Aspects of Applications. Delavan Fuel Metering Products Operation, 11 p.
http://beckwithheating.com/ebook/Boiler111/Fuel_Nozzles_for_Burners.PDF

[5]   Müller, T., et al. (2018) A Low Power Liquid Fueled Burner Using a Novel Atomization Concept. Joint Meeting, the German and Italian Sections of the Combustion Institute, Sorrento, Italy.

[6]   Etzold, M., Han, Y. and Durst, F. (2016) A Novel Spray Generator for Low-Energy Oil Burners. International Journal of Spray and Combustion Dynamics, 8, 53-64.
https://doi.org/10.1177/1756827715627065

[7]   NORA (2016) Chapter 5: Nozzles and Combustion Chambers. NORA Silver Oilheat Technicians Manual.
https://noraweb.org/wp-content/uploads/2016/10/NORA-Silver-Chapter-5.pdf

 
 
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