Port Injection Of Biomass Producer Gas From Downdraft Gasifier In A Diesel Engine

Producer gas (PG), generated from thermo-chemical conversion process of biomass gasification has been proven to be used as an alternative fuel for internal combustion engine. However, major problems of PG when used as fuel in internal combustion engine are loss of power or engine derating and high e...

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Main Author:	Hassan, Suhaimi
Format:	Thesis
Language:	English
Published:	2011
Subjects:	TJ1-1570 Mechanical engineering and machinery
Online Access:	http://eprints.usm.my/41249/1/SUHAIMI_BIN_HASSAN_24_Pages.pdf
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id	my-usm-ep.41249
record_format	uketd_dc
spelling	my-usm-ep.412492018-08-07T04:21:23Z Port Injection Of Biomass Producer Gas From Downdraft Gasifier In A Diesel Engine 2011 Hassan, Suhaimi TJ1-1570 Mechanical engineering and machinery Producer gas (PG), generated from thermo-chemical conversion process of biomass gasification has been proven to be used as an alternative fuel for internal combustion engine. However, major problems of PG when used as fuel in internal combustion engine are loss of power or engine derating and high exhaust emissions due to incomplete combustion. The most possible reasons are due to low heating value of PG itself and low energy density of PG-air mixture as compared to other alternative gaseous fuel. Based on literature studies, the main factors influencing power output from internal combustion engine fuelled with PG, particularly diesel engine are compression ratio, heating value of PG and the way of air is introduced into the engine cylinder. The method of increasing air density into engine cylinder has been selected, and the present research work deals with supercharging the diesel engine fuelled by PG under dual fuel mode with advanced fuel injection timing. Both PG from downdraft gasifier and air were compressed separately, and simultaneously injected and mixed into the engine’s cylinder via port injection. The experiments were carried out at a constant injection pressure of 200 kPa, with varying injection flow rates of both PG and air at different engine speeds and loads. The effects of fuel injection timing and supercharged on the performance, combustion characteristics and exhaust emission of single cylinder diesel engine have been experimentally investigated. Comparisons were made on diesel fuel alone, xx premixed dual fuel diesel/PG with naturally aspirated (NA) mode, premixed dual fuel diesel/PG and diesel-vegetable oil blends/PG with supercharged (SC) mode of operation. Experiments were conducted at standard 14° and advanced fuel injection timings of 17°, 20° and 23° crank angle before top dead centre. The important finding from this experiment is a major reduction of power derating that ranges between 28.12%-31.37% in a conventional premixed dual fuel D/PG with NA mode to 1.64%-6.41% in premixed dual fuel D/PG with SC mode of operations. Experimental results show that combination of using SC method and advanced fuel injection timing in dual fuel PG engine, brake thermal efficiency and diesel displacement were found increased significantly. There is a significant reduction in specific energy consumption, exhaust gas temperature, nitrogen oxides and carbon monoxide emissions. It was also observed a reduction in ignition delay and increased in cylinder peak pressure of premixed dual fuel D/PG in SC mode as compared to NA mode of operation. 2011 Thesis http://eprints.usm.my/41249/ http://eprints.usm.my/41249/1/SUHAIMI_BIN_HASSAN_24_Pages.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Mekanik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	TJ1-1570 Mechanical engineering and machinery
spellingShingle	TJ1-1570 Mechanical engineering and machinery Hassan, Suhaimi Port Injection Of Biomass Producer Gas From Downdraft Gasifier In A Diesel Engine
description	Producer gas (PG), generated from thermo-chemical conversion process of biomass gasification has been proven to be used as an alternative fuel for internal combustion engine. However, major problems of PG when used as fuel in internal combustion engine are loss of power or engine derating and high exhaust emissions due to incomplete combustion. The most possible reasons are due to low heating value of PG itself and low energy density of PG-air mixture as compared to other alternative gaseous fuel. Based on literature studies, the main factors influencing power output from internal combustion engine fuelled with PG, particularly diesel engine are compression ratio, heating value of PG and the way of air is introduced into the engine cylinder. The method of increasing air density into engine cylinder has been selected, and the present research work deals with supercharging the diesel engine fuelled by PG under dual fuel mode with advanced fuel injection timing. Both PG from downdraft gasifier and air were compressed separately, and simultaneously injected and mixed into the engine’s cylinder via port injection. The experiments were carried out at a constant injection pressure of 200 kPa, with varying injection flow rates of both PG and air at different engine speeds and loads. The effects of fuel injection timing and supercharged on the performance, combustion characteristics and exhaust emission of single cylinder diesel engine have been experimentally investigated. Comparisons were made on diesel fuel alone, xx premixed dual fuel diesel/PG with naturally aspirated (NA) mode, premixed dual fuel diesel/PG and diesel-vegetable oil blends/PG with supercharged (SC) mode of operation. Experiments were conducted at standard 14° and advanced fuel injection timings of 17°, 20° and 23° crank angle before top dead centre. The important finding from this experiment is a major reduction of power derating that ranges between 28.12%-31.37% in a conventional premixed dual fuel D/PG with NA mode to 1.64%-6.41% in premixed dual fuel D/PG with SC mode of operations. Experimental results show that combination of using SC method and advanced fuel injection timing in dual fuel PG engine, brake thermal efficiency and diesel displacement were found increased significantly. There is a significant reduction in specific energy consumption, exhaust gas temperature, nitrogen oxides and carbon monoxide emissions. It was also observed a reduction in ignition delay and increased in cylinder peak pressure of premixed dual fuel D/PG in SC mode as compared to NA mode of operation.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Hassan, Suhaimi
author_facet	Hassan, Suhaimi
author_sort	Hassan, Suhaimi
title	Port Injection Of Biomass Producer Gas From Downdraft Gasifier In A Diesel Engine
title_short	Port Injection Of Biomass Producer Gas From Downdraft Gasifier In A Diesel Engine
title_full	Port Injection Of Biomass Producer Gas From Downdraft Gasifier In A Diesel Engine
title_fullStr	Port Injection Of Biomass Producer Gas From Downdraft Gasifier In A Diesel Engine
title_full_unstemmed	Port Injection Of Biomass Producer Gas From Downdraft Gasifier In A Diesel Engine
title_sort	port injection of biomass producer gas from downdraft gasifier in a diesel engine
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Mekanik
publishDate	2011
url	http://eprints.usm.my/41249/1/SUHAIMI_BIN_HASSAN_24_Pages.pdf
_version_	1747820895644155904

Port Injection Of Biomass Producer Gas From Downdraft Gasifier In A Diesel Engine

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