The aim of this present work was to investigate the combined effects of injection pressure and exhaust gas recirculation (EGR) on the combustion, performance and emission characteristics in a modified stationary diesel engine. Biodiesel blend (BDB) method also has been approached in this present work to improve the fuel properties by mixing two feedstock of different saturated fatty acid composition. Biodiesel blend was prepared from waste feedstock oils of waste cooking oil and chicken fat oil. A new method of raw bio-oil mixing has been carried out for BDB production and reduced the production cost. The engine was tested with three injection pressures (300, 400 and 500 bar) and two different EGR rates (10% and 20%) at full load, and experimental results were compared with biodiesel conventional combustion (BDC) mode. The outcomes showed that the amount of oxygen presents in biodiesel blend is not enough to support the combustion at high EGR rate of 20%. High injection pressure of 500 bar with the minimum amount of 10% EGR operating condition, named as P500E10, offered the high brake thermal efficiency of 34.93%, which is 11.56% higher than BDC. Nitric oxide emissions, the major constrain for biodiesel usage in engine applications, also reduced at P500E10 by 2.56% as compared to BDC. The overall experimental results showed that the BDB prepared with waste feedstocks would be an impressive alternative resource for engine applications along with suitable injection pressure and EGR rate.
|Number of pages||17|
|Journal||Arabian Journal for Science and Engineering|
|Publication status||Published - 5 Apr 2023|
- Biodiesel fuel
- Injection pressure
- waste feedstocks
- Exhaust gas recirculation