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Energies 2019, 12(6), 1002; https://doi.org/10.3390/en12061002

Water-In-Oil Emulsion as Boiler Fuel for Reduced NOx Emissions and Improved Energy Saving

1
Green Energy Technology Research Center, Kun Shan University, Tainan 71070, Taiwan
2
Department of Mechanical Engineering, Kun Shan University, Tainan 71070, Taiwan
3
Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
4
Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 70101, Taiwan
*
Authors to whom correspondence should be addressed.
Received: 31 January 2019 / Revised: 4 March 2019 / Accepted: 11 March 2019 / Published: 14 March 2019
(This article belongs to the Special Issue Selected Papers from "IEEE ICICE 2018")
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Abstract

An experimental system for observing the drop vaporization and microexplosion characteristics of emulsified droplets in high-temperature environments was conducted to analyze the effects of environmental temperature, droplet size, and water content on droplet behavior. In addition, emulsified low-sulfur heavy fuel oil (HFO) with a 20 vol% water content and pure low-sulfur HFO were used as fuels for burning in an industrial boiler under normal operating conditions. The results showed that by using an emulsified HFO with a 20 vol% water content, the boiler efficiency can be improved by 2%, and that a reduction of 35 ppm in NOx emissions (corresponding to a NOx reduction rate of 18%) can be achieved. These advantages are due to the occurrence of a microexplosion during the combustion of the emulsified droplets. It was observed that when emulsified HFO with a 20 vol% water content was used, the fuel (HFO) consumption rate was 252 l/h. On the other hand, the fuel consumption rate was 271 l/h when pure low-sulfur HFO was used. Therefore, a reduction of 19 l/h in the fuel (HFO) consumption rate was achieved when using the water-in-oil emulsion, corresponding to fuel savings of 7%. View Full-Text
Keywords: water-emulsified fuel; boiler efficiency; NOx emissions; microexplosion; droplets evaporation; energy saving water-emulsified fuel; boiler efficiency; NOx emissions; microexplosion; droplets evaporation; energy saving
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hsuan, C.-Y.; Hou, S.-S.; Wang, Y.-L.; Lin, T.-H. Water-In-Oil Emulsion as Boiler Fuel for Reduced NOx Emissions and Improved Energy Saving. Energies 2019, 12, 1002.

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