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Combustion processes are the primary sources of air pollution. Measures are taken to reduce emissions from combustion processes. This paper is an experimental study of the effect of spray angles on the emission of pollutants from a continuous combustion chamber using the liquid fuels (gas oil). The angles of spraying studied are 30°, 45°, and 60°. The pollutants CO, SOOT, and NOx are measured. The results showed that the emissions at 45° were less than that at 30° at the corner of 30°. This reduction in emitted pollutants was due to the decrease in droplet diameter associated with the increase of the spray's angle. Better atomization and mixing in this case improved and the mixture is more homogeneous. However, this caused higher temperatures leading to increased rates of emission of SOOT and NOx. The greater the angle of the spray displays, droplets diameters decreased, and the amount of evaporation increased producing higher combustion temperature and decreased emission of CO. However, this caused an increase in SOOT and NOx emissions.

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This study investigates the effect of using olive oil on the pollutants emissions in the continuous combustion chamber. The bio-fuels used are mixtures of olive oil with two types of hydrocarbon fuels (gas oil and kerosene). The pollutants measured include carbon monoxide CO, unburned hydrocarbon UHC, soot and nitrogen oxide NOx .It is found that all pollutants have less percent emissions when using olive oil blended with percent addition of 5%, 10%, and 15%. The reduction in emission with olive oil blends is due to the existence of oxygen O2 in the chemical structure of the olive oil which is sufficient to achieve the complete combustion. The test was conducted through the range of equivalence ratio between (0.85-1.7). Results showed that olive oil blends with gas oil brings about 45.63% reduction in UHC and 36.48% soot, while CO 32.24% and NOx showed only about 39.54% reduction from that of pure gas oil. Whilst, blends with kerosene, showed a reduction of about 48.92% in UHC and 42.13% soot, while for CO and NOx the reduction was 37.41% and 42.85% respectively compared with those of pure kerosene emission.

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This study investigates the effect of Castor oil on the pollutants emissions in the continuous combustion chamber. The bio-blend fuels used are mixtures of Castor oil with two types of hydrocarbon fuels (gas oil and kerosene). The pollutants measured include carbon monoxide CO, unburned hydrocarbon UHC, soot and nitrogen oxide NOx . It is found that all pollutants have less emissions when using Castor oil blended in different percentages of 5% , 7%, and 10% . The lower emission with Castor oil blends due to the existence of oxygen O2 in the chemical structure of the Castor oil which is sufficient to seek the complete combustion. The test were conducted through the range of equivalence ratio between (0.85-1.7) . Results showed that Castor oil blends with gas oil brings a reduction of about 71.2% in CO, 22.1% in UHC, 37.8% in NOx and 29.6% in soot emissions from that of pure gas oil. But, blends with kerosene, showed a reduction of about 70.6% in CO, 20% in UHC, 35.8% in NOx and 29% in soot emissions compared with those of pure kerosene.

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