scholarly journals EFFECT OF COMPRESSION RATIO ON PERFORMANCE OF A HYDROGEN BLENDED CNG-DIESEL DUAL FUEL ENGINE

2015 ◽  
Vol 44 (2) ◽  
pp. 87-93 ◽  
Author(s):  
Sridhara Reddy ◽  
Maheswar Dutta ◽  
K.Vijaya Kumar Reddy
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Compression Ratio ◽  
Thermal Efficiency ◽  
Specific Energy Consumption ◽  
Dual Fuel ◽  
Operating Parameters ◽  
Brake Thermal Efficiency ◽  
Performance And Emission ◽  
Emission Behavior

Compression ratios of the engine considerably affect the performance and emission behavior of an engine.The paper discusses about effect of compression ratios on the operating parameters such as brake specific fuelconsumption (BSFC), brake specific energy consumption (BSEC), brake thermal efficiency (BTE) and volumetricefficiency on a stationary diesel-CNG dual fuel engine by adding hydrogen fraction as a combustion booster. Theexhaust emission behavior of the engine is also presented. Addition of hydrogen in CNG has given better resultsthan diesel-CNG dual fuel operation of the engine. The volumetric efficiency and emissions like NOx are theparameters which needed attention towards this study. The paper presents experimental results and analyzes them.

Optimization of performance and emissions in a biogas–diesel dual fuel engine with cerium oxide nanoparticle addition

2018 ◽  
Vol 233 (5) ◽  
pp. 1178-1193 ◽  
Author(s):  
M Feroskhan ◽  
Saleel Ismail ◽  
Siddhesh Gosavi ◽  
Pranil Tankhiwale ◽  
Yasir Khan
Keyword(s):  
Cerium Oxide ◽  
Thermal Efficiency ◽  
Signal To Noise Ratio ◽  
Volumetric Efficiency ◽  
Dual Fuel ◽  
Flow Rates ◽  
Brake Thermal Efficiency ◽  
Performance And Emission ◽  
Air Stream ◽  
Performance And Emissions

This study was carried out on a diesel engine operated in dual fuel mode by introducing biogas in the intake air stream. Cerium oxide (CeO2) nanoparticles in varying concentrations were used as diesel additive. Performance and emission tests were carried out to evaluate the effects of five input parameters, namely, CeO2 concentration, torque, biogas flow rate, methane fraction of biogas, and intake temperature. Taguchi’s method was adopted to reduce the number of experimental trials. Signal-to-noise ratio variations were studied and analysis of variance was carried out to obtain the optimum combination of operating parameters and their contributions towards the performance and emission indices. Results showed that low biogas flow rates ensure better thermal and volumetric efficiency and low HC and CO emissions. High biogas flow rates provide significant reduction in diesel consumption and NOx emissions. Increasing the methane content of biogas lowers diesel consumption and emissions of HC and CO. Adding 25 mg/L of CeO2 to diesel improves brake thermal efficiency and lowers all emissions. While manifold heating improves brake thermal efficiency, low intake temperature is preferred from the standpoint of volumetric efficiency and emissions.

Studies on Influence of Injection Timing and Diesel Replacement on LPG-Diesel Dual-Fuel Engine

2003 ◽  
Author(s):  
C. V. Sudhir ◽  
Vijay Desai ◽  
Y. Suresh Kumar ◽  
P. Mohanan
Keyword(s):  
Energy Consumption ◽  
Diesel Engine ◽  
Fuel Consumption ◽  
Thermal Efficiency ◽  
Dual Fuel ◽  
Injection Timing ◽  
Brake Thermal Efficiency ◽  
Full Load ◽  
Smoke Density ◽  
Diesel Operation

Reducing the emissions and fuel consumption for IC engines are no longer the future goals; instead they are the demands of today. People are concerned about rising fuel costs and effects of emissions on the environment. The major contributor for the increased levels of pollutants is the Diesel engines. Diesel engine finds application in almost in all fields, including transportation sector such as buses, trucks, railway engines, etc. and in industries as power generating units. In the present work an attempt is made for effective utilization of diesel engine aiming for reduction in fuel consumption and smoke density. This is achieved by some minor modifications in diesel engine, so as to run the existing diesel engine as a LPG-Diesel dual-fuel engine with LPG (Liquefied Petroleum Gas) induction at air intake. The important aspect of LPG-Diesel dual-fuel engine is that it shows significant reduction in smoke density and improved brake thermal efficiency with reduced energy consumption. An existing 4-S, single cylinder, naturally aspirated, water-cooled, direct injection, CI engine test rig was used for the experimental purpose. With proper instrumentation the tests were conducted under various LPG flow rates, loads, and injection timings. The influence of the diesel replacement by LPG on smoke density, brake specific energy consumption and brake thermal efficiency were studied. The optimal diesel replacement pertaining to the maximum allowable LPG gas flow limits could be assessed with these experiments. The influence of the injection timing variation on the engine performance and smoke density were analyzed form the experimental results. It was also observed that beyond half load operation of the dual-fuel engine, the brake thermal efficiency increases with diesel replacement, and at full load up to 4% improvement was observed compared to full diesel operation. At full load reduction in smoke density up to 25–36% was observed compared to full diesel operation. At advance injection timing of 30°btdc the performance was better with lower emissions compared to normal and retarded injection timings.

scholarly journals Evaluation of the Air Oxygen Enrichment Effects on Combustion and Emissions of Natural Gas/Diesel Dual-Fuel Engines at Various Loads and Pilot Fuel Quantities

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3028 ◽  
Author(s):  
Roussos G. Papagiannakis ◽  
Dimitrios C. Rakopoulos ◽  
Constantine D. Rakopoulos
Keyword(s):  
Energy Consumption ◽  
Natural Gas ◽  
Burning Rate ◽  
Specific Energy ◽  
Diesel Fuel ◽  
Ignition Delay ◽  
Specific Energy Consumption ◽  
Oxygen Enrichment ◽  
Dual Fuel ◽  
Pilot Fuel

The use of natural gas (NG) as supplement of the normal diesel fuel in compression ignition (CI) environments (Natural Gas/Diesel Dual-Fuel, NG/DDF), seems to present an answer towards reducing soot or particulate matter (PM) and nitrogen oxides (NOx) emissions in existing and future diesel engine vehicles. The benefits for the environment can be even higher, as recently NG quality gas can be produced from biomass (bio-methane or bio-CNG or ‘green gas’). However, this engine type where the main fuel is the gaseous one and the diesel liquid fuel constitutes the ignition source (pilot), experiences higher specific energy consumption (SEC), carbon monoxide (CO), and unburned hydrocarbons (HC) emissions compared to the conventional (normal) diesel one, with these adverse effects becoming more apparent under partial load operation conditions. Apart from using bio-fuels as pilot fuel, it is anticipated that air oxygen enrichment—addition of oxygen in the intake air—can mitigate (at least partly) the associated negative results, by accelerating the burning rate and reducing the ignition delay. Therefore, the present work strives to investigate the effects of various degrees of oxygen enrichment on the combustion, performance, and emissions of such a NG/DDF engine, operated under various loads and pilot (diesel fuel) quantities. The study is carried out by using an in-house, comprehensive, computational model, which is a two-zone (phenomenological) one. The accuracy of the modeling results are tested by using related experimental data from the literature, acquired in an experimental investigation conducted on a naturally aspirated, light-duty, NG/DDF engine. The computational study is extended to include various pilot fuel quantities, attempting to identify the influence of the examined parameters and witness advantages and disadvantages. The study results demonstrate that the air oxygen enrichment reduces the specific energy consumption and CO emissions, by accelerating the burning rate and reducing the ignition delay (as revealed by the cylinder pressure and rate of heat release diagrams), without impairing seriously the soot and NO emissions. The conclusions of the specific investigation are much useful, particularly if wished to identify the optimum combination of the parameters under examination for improving the overall performance of existing CI engines functioning under natural gas/diesel fuel operating mode.

scholarly journals Electrochemical Mineralization of Ibuprofen on BDD Electrodes in an Electrochemical Flow Reactor: Numerical Optimization Approach

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1666
Author(s):  
Alejandro Regalado-Méndez ◽  
Martín Ruiz ◽  
José A. Hernández-Servín ◽  
Reyna Natividad ◽  
Rubi Romero ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Polynomial Regression ◽  
Flow Reactor ◽  
Specific Energy Consumption ◽  
Operating Parameters ◽  
Optimization Approach ◽  
Wastewater Remediation ◽  
Boron Doped Diamond ◽  
Batch Mode

Statistical analysis was applied to optimize the electrochemical mineralization of ibuprofen with two boron-doped diamond (BDD) electrodes in a continuous electrochemical flow reactor under recirculation batch mode. A central composite rotatable (CCR) experimental design was used to analyze the effect of initial pH (2.95–13.04), current intensity (2.66–4.34 A), and volumetric flow rate (0.16–1.84 L/min) and further optimized by response surface methodology (RSM) to obtain the maximum mineralization efficiency and the minimum specific energy consumption. A 91.6% mineralization efficiency (EM) of ibuprofen with a specific energy consumption (EC) of 4.36 KW h/g TOC within 7 h of treatment was achieved using the optimized operating parameters (pH0 = 12.29, I = 3.26 A, and Q of 1 L/min). Experimental results of RSM were fitted via a third-degree polynomial regression equation having the performance index determination coefficients (R2) of 0.8658 and 0.8468 for the EM and EC, respectively. The reduced root-mean-square error (RMSE) was 0.1038 and 0.1918 for EM and EC, respectively. This indicates an efficient predictive performance to optimize the operating parameters of the electrochemical flow reactor with desirability of 0.9999993. Besides, it was concluded that the optimized conditions allow to achieve a high percentage of ibuprofen mineralization (91.6%) and a cost of 0.002 USD $/L. Therefore, the assessed process is efficient for wastewater remediation.”

scholarly journals Performance and Environmental Impact Assessment of Diesel Engine Operating on High Viscous Punnai Oil - Diesel Blends

2022 ◽  
Author(s):  
Chidambaranathan Bibin ◽  
Ponnusamy Kumarasami Devan ◽  
Soundararajan Gopinath ◽  
Thulasiram Ramachandran
Keyword(s):  
Energy Consumption ◽  
Thermal Efficiency ◽  
Peak Load ◽  
Specific Energy Consumption ◽  
Oxides Of Nitrogen ◽  
Environmental Aspect ◽  
Brake Thermal Efficiency ◽  
Oil Blends ◽  
Smoke Opacity ◽  
Load Conditions

Abstract The increasing demand for energy consumption because of the growing population and environmental concerns has motivated the researchers to ponder about alternative fuel that could replace diesel fuel. A new fuel should be cheaply available, clean, efficient, and environmentally friendly. In this paper, the engine operated with neat punnai oil blends with diesel were investigated at various engine load conditions, keeping neat punnai oil and diesel as base fuels. The performance indicators such as Brake Specific Energy consumption (BSEC), Brake thermal efficiency (BTE) and Exhaust gas temperature (EGT); emission indicators such as Carbon monoxide (CO), Oxides of Nitrogen (NOx), smoke opacity; and combustion parameters like cylinder pressure and heat release rate were examined. The Brake thermal efficiency of diesel is 29.2% whereas, it was lower for neat punnai oil and its blends at peak load conditions. Concerning the environmental aspect, Oxides of Nitrogen emission showed a decreasing trend with higher smoke emissions for Punnai oil blends. Detailed combustion analysis showed that on smaller concentrations of punnai oil in the fuel blend, the duration of combustion has improved significantly. However, for efficiency and emissions, the P20 (20% Punnai oil and 80% Diesel) blend performs similar to that of diesel compared to all other blending combinations. When compared with diesel, the P20 blend shows an improvement in BSEC by 26.37%. It also performs closer in HC emission, a marginal increase in smoke opacity of 4% with reduced NOx and CO2 emission of 7.9% and 4.65% respectively. Power loss was noticed when neat punnai oil and higher blends were used due to the high density and low calorific value of punnai oil blends which leads to injecting more fuel for the same pump stroke.

scholarly journals Characteristics of Poultry Litter Biodiesel with Magnalium and Cobalt Oxide as a Additives

2019 ◽  
Vol 8 (2S5) ◽  
pp. 191-195
Keyword(s):  
Cobalt Oxide ◽  
Thermal Efficiency ◽  
Specific Energy Consumption ◽  
Poultry Litter ◽  
Maximum Load ◽  
Emission Characteristics ◽  
Brake Thermal Efficiency ◽  
Performance And Emission ◽  
Ci Engine ◽  
Test Fuel

The importance of bio diesel in CI engine has substantiated, the recent research has been motivated on the use of different Nano materials as additives in diesel engines. The present investigation is to study the performance and emission characteristics of a single cylinder direct injection CI engine using transesterified Poultry litter(PL) biodiesel blend with and without Cobalt oxide and Magnalium nanoparticles as additives. This biodiesel blends with diesel, and biodiesel-diesel-nanoparticles with each and both the nano additives are tested in CI engine with constant speed of 1600 rpm with variation loads low to high. The performance parameters like Brake power, Brake specific energy consumption, Brake specific fuel consumption and efficiency of both Mechanical and volumetric are measured by VCR engine setup, emission characteristics like NO2 , CO, UBHC are measured by GAS ANALYSER these results are compared with pure diesel or neat diesel. The NO emissions gradually reduced for B20 Co3O4 Al-mg test fuel with percentage of 7.5% to the diesel and B20 to 11% for the diesel. Under maximum load of 10%, observed that there is improvement in Brake thermal efficiency for B20Al-Mg 30ppm Co3O4 30ppm and followed by 9% improvement in Brake thermal efficiency for B20 Co3O4 30ppm and followed by 4% increase in biodiesel test fuel, compared to diesel.

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