Infinity Supercritical LLC


Publication Title | Biogas-Straight Vegetable Oil Dual Fuel Engine for Power Generation in Remote Rural Locations

Dewaxing Information Search

CO2 Extraction | Winterization Dewaxing | CBD and Botanical Oil Organic Fluid Extraction search was updated real-time via Filemaker on:

CO2 Extraction | Winterization Dewaxing | CBD and Botanical Oil Organic Fluid Extraction | Return to Search List

Search Completed | Title | Biogas-Straight Vegetable Oil Dual Fuel Engine for Power Generation in Remote Rural Locations
Original File Name Searched: 421-P60.pdf | Google It | Yahoo | Bing



Page Number: 001
Previous Page View | Next Page View

Text | Biogas-Straight Vegetable Oil Dual Fuel Engine for Power Generation in Remote Rural Locations | 001



Journal of Clean Energy Technologies, Vol. 5, No. 6, November 2017
Biogas-Straight Vegetable Oil Dual Fuel Engine for Power Generation in Remote Rural Locations
K. Narayana Reddy and A. Ramesh

Abstract—Decentralised power generation in remote rural locations can be done using locally available biomass based renewable energy sources. A single cylinder stationary diesel engine was run in the neat vegetable oil (Jatropha oil) – biogas dual fuel mode to study the potential of this method of operation and also device simple methods to enhance the performance. Increasing the rate of pumping of the injected Jatropha oil and retarding its timing of injection resulted in considerable improvements in thermal efficiency and reduction in emissions. The smoke level at 60% of biogas energy dropped from 2.25 to 0.9 BSU, 2.15 to 0.6 BSU and 1.4 to 0.5 BSU with 7mm, 8mm and 9mm diameter injection pump plungers respectively. Further improvements in the combustion rate of the inducted biogas were possible with enhanced swirl level of the inducted air. At 60% biogas share the thermal efficiency went up by 8%, HC emissions dropped by 26% and smoke level dropped by 17% with enhanced swirl. On the whole, energy shares of biogas as high as 80% could be achieved with good engine performance.
Index Terms—Alternative engine fuels, biogas engines, dual fuel engines, vegetable oil as fuel.
I. INTRODUCTION
Diesel engines have been used for decades for commercial transportation, industrial power generation, locomotives, marine systems and for agricultural applications. Considering this it is essential to explore methods to use alternative fuels in diesel engines. In a vast country like India with remotely located villages, generating the power requirements using locally available resources that are renewable is a good option. Methyl esters of vegetable oils that are generally known as biodiesels (once they meet standards) have properties close to diesel. In the case of rural applications it may be difficult to produce biodiesel using available resources hence it will be wise to evaluate the use of raw or straight vegetable oils for diesel engine applications in rural applications. Most of the work on straight vegetable oils has indicated higher smoke levels, lower thermal efficiencies and lower power outputs when used in conventional diesel engines [1]-[4]. This is mainly because of their significantly higher viscosity and carbon residue than diesel. Lower NOx levels have also been reported with straight vegetable oils [5], [6]. Improving fuel atomization in a diesel engine by altering injection parameters can enhance the performance with non
Manuscript received October 23, 2016; revised February 27, 2016. This work was supported in part by the Ministry of New and Renewable Energy, Government of India. Der Grant BS123456 (sponsor and financial support acknowledgment goes here).
K. Narayana Reddy is with M/s Ashok Leyland Limited, Chennai, India (e-mail: j.narayanareddy@gmail.com).
A. Ramesh is with the Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600036, India (e-mail: aramesh@iitm.ac.in).
edible vegetable oils. Vegetable oils have a calorific value and cetane number comparable to diesel and their flash point is very high. However, they also have other disadvantages like poor volatility and high carbon residue. Properties of different non-edible vegetable oils are presented in Table I.
TABLE I: PROPERTIES OF JATROPHA OIL [7]
Biogas which mainly contains methane and carbon dioxide along with small proportions of other gases and water vapor can be produced easily through anerobic digestion of waste plant and animal matter. Typical properties of biogas are given in Table II. Biogas has a high self-ignition temperature and hence can be used in the dual fuel mode [8]-[10]. Dual fuel engines are modified diesel engines wherein a gaseous fuel like biogas, natural gas, producer gas or hydrogen is inducted along with air and compressed in the normal way. Then near top dead centre (TDC) a small amount of diesel is injected so that itself ignites and becomes the ignition source for the inducted gaseous fuel air mixture. Biogas diesel dual fuel operation is known to reduce NOx emissions and also particulate emissions significantly. [11]. Thecarbondioxide in biogas also helps suppress knocking [12]. Experiments conducted earlier by the authors indicated that biogas can be inducted in a dual fuel engine while straight vegetable oil can be injected for ignition instead of diesel. This means that an engine can be run by completely renewable fuels that can be sourced from the villages itself. This work focuses on this method of operation.
TABLE II: TYPICAL PROPERTIES AND COMPOSITION OF BIOGAS [13]-[15]
Property
Diesel
Jatropha oil
Density (kg/m3)
840
918.6
Calorific Value (kJ/kg)
42490
39774
Viscosity (cst)
4.59
49.93
Cetane Number
45-55
40-45
Flash Point (°C)
50
240
Carbon Residue (%)
0.1
0.64
Composition (%)
Auto ignition temperature (°C)
Methane (CH4) = 50-70 Carbon dioxide (CO2) = 25-50 Hydrogen (H2) = 1-5 Nitrogen (N2) = 0.3-3
650
Calorific value (MJ/kg)
Density at 1 atm and 15°C (kg/m3)
17
1.2
Flame speed at
atmospheric pressure
and temperature for φ=1 (
m/s)
0.25
Flammability limits (vol% in air)
7.5-14
Stoichiometeric air-fuel ratio (kg of air/kg of fuel)
5.7
Research octane number
130
487
II. DETAILS OF THE WORK
The aim of this work was to use biogas in a constant speed stationary diesel engine in the dual fuel mode with straight

Image | Biogas-Straight Vegetable Oil Dual Fuel Engine for Power Generation in Remote Rural Locations



biogas-straight-vegetable-oil-dual-fuel-engine-power-generation-remote-rural-locations-001
Infinity Supercritical Winterization Wax Fast Filter | Filter Wax from Winterized Solution Using Infinity Supercritical Fast Filter System | CBD and Botanical Wax Filtering - Botanical Oil Wax Fast Filtering Machine- Go to website

Search Contact: greg@infinitysupercritical.com