Abstract
Bio-oil (bio-oil) was produced from chicken manure in a pilot-scale pyrolysis facility. The raw bio-oil had a very high viscosity and sediments which made direct application to diesel engines difficult. The bio-oil was blended with diesel fuel with 25% and 75% volumetric ratio at the normal temperature, named as blend 25. A rapid compression and expansion machine was used for a combustion test under the experimental condition corresponding to the medium operation point of a light duty diesel engine using diesel fuel, and blend 25 for comparison. The injection related pressure signal and cylinder pressure signal were instantaneously picked up to analyze the combustion characteristics in addition to the measurement of NOx and smoke emissions. Blend 25 resulted in reduction of the smoke emission by 80% and improvements of the apparent combustion efficiency while the NOx emission increased by 40%. A discussion was done based on the analysis results of combustion.
Highlights
From the view point of effective usage of energy resources, much research concerning the application of bio-oil from biomass have been carried out
Eucalyptus/diesel blends were tested in a single cylinder direct injection diesel engine and the smoke and THC emissions were reduced according to increasing the ratio of blending up to 50% while NOx increased due to longer ignition delay which enlarged the portion of premixed combustion [4]
Compared with diesel fuel, the smoke emission was reduced by 12% due to the presence of oxygen in coconut oil while NOx decreased by 36% caused by shortened ignition delay [5]
Summary
From the view point of effective usage of energy resources, much research concerning the application of bio-oil from biomass (bio-oil) have been carried out. Chiaramonti, et al operated a single cylinder direct injection diesel engine by using emulsified pyrolysis pine oil with diesel and reported engine troubles in injector nozzle and fuel supply pump [3]. Eucalyptus/diesel blends were tested in a single cylinder direct injection diesel engine and the smoke and THC emissions were reduced according to increasing the ratio of blending up to 50% while NOx increased due to longer ignition delay which enlarged the portion of premixed combustion [4]. Compared with diesel fuel, the smoke emission was reduced by 12% due to the presence of oxygen in coconut oil while NOx decreased by 36% caused by shortened ignition delay [5]. Carlos et al reported the physical and chemical characteristics of raw pyrolysis bio-oil produced from chicken manure and upgraded bio-oil compatible to diesel fuel [6]
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