Investigation on boiler efficiency and pollutant emissions of water/heavy oil emulsions using edge-tone resonant homogenizer

Li, Yi-Yin; Hou, Shuhn-Shyurng; Sheu, Wen-Jenn

doi:10.1016/j.fuel.2013.11.029

Cited by 14 publications

(15 citation statements)

References 22 publications

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“…The water-HFO emulsion reduces energy consumption compared to pure HFO, as evidenced by an increase in the boiler efficiency. This tendency agrees well with Li et al's study [14]. In addition, as shown in Figures 8-10 and 12 under the three experimental operating conditions, the CO 2 concentration was maintained at approximately 15%; the CO concentrations were nearly zero; and firing the emulsified fuel oil emitted lower NO x concentrations up to a NO x reduction rate of 18%.…”

Section: Evaporation and Microexplosion For Suspended Dropletsupporting

confidence: 89%

“…In addition, Yoshimoto et al [12] and Selim et al [13] reported that the use of water/oil emulsified fuel is effective for fuel savings, where they attributed the specific fuel consumption and the thermal efficiency in the tested engine to a reduction in heat loss. Li et al [14] applied a water/heavy oil emulsion homogenizer to a boiler to directly evaluate the boiler efficiency. The important findings related to the use of an emulsified fuel without a surfactant include the fact that the higher boiler efficiency of the water/heavy oil emulsion has the potential to reduce energy consumption by 15% compared to that obtained with pure heavy oil and also the fact that the NO x emissions in the boiler increase with increases in the amount of excess air.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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 NO x emissions (corresponding to a NO x 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%.

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Section: Evaporation and Microexplosion For Suspended Dropletsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Thus, the emulsified fuel is one of the main strategies to substitute the conventional fossil fuel for the purpose of emission control and enhancement of fuel efficiency. Moreover, several authors (Li et al, 2014;Carneiro et al, 2015;Chen and Lee, 2008;Lin et al, 2011; of emulsifying agent are the main stabilizers of an emulsion.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have indicated the occurrence of the phenomenon of inflation before the phenomenon of the explosion (see, for example, Ogunkoya et al, 2015;Soulayman and Youssef, 2018) and some studies indicate the possibility of raising the yield of the water pipe boiler in different rates. This percentage reaches about 15% if using a water-fuel emulsion (see for example (Li et al, 2014)).…”

Section: Introductionmentioning

confidence: 99%

Water/Heavy Fuel Oil Emulsion Production, Characterization and Combustion

Alaa

Soulayman

Abdelkarim

et al. 2021

Int. J. Renew. Energy Dev.

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In order to produce a water/heavy fuel oil emulsion (W/HFO) with different water contents to cover the daily needs of a fire tube boiler or a water tube boiler, a special homogenizer is designed, constructed and tested. The produced emulsion is characterized and compared with the pure HFO properties. It is found experimentally in fire tube boiler that, the use of W/HFO emulsion with 8% of water content (W0.08/HFO0.92) instead of HFO leads to a saving rate of 13.56% in HFO. For explaining the obtained energy saving the term “equivalent heat value (EHV) of the W/HFO emulsions”, defined as the ratio of the W/HFO emulsion net calorific value to the HFO content in the emulsion, is used. Based on direct measurements, provided in this work, it was found that the equivalent heat value (EHV) increases with the water content in the water/heavy fuel oil (W/HFO). It reaches 1.06 times of HFO net calorific value at water content of 22.24%. The obtained, in the present work, experimental results demonstrate the dependence of the emulsion EHV on its water content. These results are in agreement with the results of other authors. Therefore, the contribution of water droplets in the emulsion combustion is verified. It is found experimentally that, the emitted CO, SO2 and H2S gases from the fire tube boiler chimney decreases by 5.66%. 3.99% and 48.77% respectively in the case of (W0.08/HFO0.92) emulsion use instead of HFO.

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“…An important factor affecting the micro-explosion could be the coalescence or phase separation of the dispersed water droplets into the continuous phase [8,10]. On the other hand, several studies [11,[14][15][16][28][29][30][31] reported the occurrence of a particular phenomenon (i.e. puffing or bubbling) prior to micro-explosion phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on puffing and micro-explosion occurrence of water in rapeseed oil emulsions droplets. Effect of the surfactant concentration.

Melo-Espinosa

Bellettre

Tarlet

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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In this paper, the assessment of puffing and micro-explosion occurrence in emulsion drops with different water percentage is studied. The emulsified fuels are formulated using micro channel emulsifier, rapeseed oil and diesel fuel as continuous phase, as well as water and Sorbitan Sesquioleate as surfactant. The formulated dispersed systems are covered under different experimental factors such as water ratio and surfactant percentage. The puffing occurrence is reported in all emulsified fuels tested (i.e. with and without surfactant). A sudden puffing and highest number of occurrence is noted when the water amount increases in all emulsified fuels. The micro-explosion phenomenon is only noted in emulsified fuel formulated without surfactant.

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Investigation on boiler efficiency and pollutant emissions of water/heavy oil emulsions using edge-tone resonant homogenizer

Cited by 14 publications

References 22 publications

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

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

Water/Heavy Fuel Oil Emulsion Production, Characterization and Combustion

Experimental investigation on puffing and micro-explosion occurrence of water in rapeseed oil emulsions droplets. Effect of the surfactant concentration.

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