Abstract
PurposeThe different performance tests were conducted on diesel engine compression ignition (CI) mode and CRDi engine.Design/methodology/approachThe CI engine was suitably modified to CRDi engine with Toroidal re-entrant combustion chamber (TRCC) and was run in dual-fuel (DF) mode. Hydrogen (H2) was supplied at different flow rates during the suction stroke, and 0.22 Kg/h of hydrogen fuel flow rate (HFFR) was found to be optimum. Diesel and biodiesel were used as pilot fuels. The CRDi engine with DF mode was run at various injection pressures, and 900 bar was found to be optimum injection pressure (IP) with 10o before top dead center (bTDC) as fuel injection timing (IT).FindingsThese operating engine conditions increased formation of oxides of nitrogen (NOx), which were reduced by exhaust gas recycle (EGR). With EGR of 15%, CRDi engine resulted in 12.6% lower brake thermal efficiency (BTE), 5.5% lower hydrocarbon (HC), 7.7% lower carbon monoxide (CO), 26% lower NOx at 80% load as compared to the unmodified diesel engine (CI mode).Originality/valueThe current research is an effort to study and evaluate the performance of CRDi engine in DF mode with diesel-H2 and BCPO-H2 fuel combinations with TRCC.
Highlights
The fast exhaustion and higher prices of fossil fuel besides environmental legislations, biofuels have been proven the potential replacement for internal combustion engine fuel.Diesel engine dominates in the automotive sector and power generation applications because of its favorable good energy efficiency, reliability, and durability, but exhaust emissions are a matter of concern, especially control of NOx
CRDi engine with BCPO gave 13.6% lower brake thermal efficiency (BTE) as compared to compression ignition (CI) mode with diesel at compression ratio (CR) of 17.5 and HFR of 0.22 Kg/h at 80% load
This work analyzed the performance of CRDi engine operated on diesel/BCPO and H2 combination with different HFR, injection pressure (IP) and Exhaust gas recirculation (EGR)
Summary
The fast exhaustion and higher prices of fossil fuel besides environmental legislations, biofuels have been proven the potential replacement for internal combustion engine fuel.Diesel engine dominates in the automotive sector and power generation applications because of its favorable good energy efficiency, reliability, and durability, but exhaust emissions are a matter of concern, especially control of NOx. Use of hydrogen as fuel especially at lower and medium engine loads in a heavy-duty H2-diesel DF engine operates well with H2 composition of 98 and 85% respectively. Exhaust gas recirculation (EGR) supplied in the engine led to decrease in the NOx emission by 75% (Dimitriou et al, 2018). A diesel engine operated at an engine speed of 1,500 rpm by using eucalyptus methyl esters and natural gas (NG) by supplying H2 at different flow rates in DF mode. An increase in heat release rate (HRR) was observed along with increase in peak pressure (PP) when the engine was enriched with NG and H2. The shorter ID was attributed for increased HRR and PP (Tarabet et al, 2018)
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