Feasibility study and engineering design of bio-waste energy in Hong Kong

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Feasibility study and engineering design of bio-waste energy in Hong Kong

 

Author: Sudarsan, Sharma
Title: Feasibility study and engineering design of bio-waste energy in Hong Kong
Degree: M.Sc.
Year: 1999
Subject: Waste products as fuel -- China -- Hong Kong
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electrical Engineering
Pages: viii, 124 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1517618
URI: http://theses.lib.polyu.edu.hk/handle/200/3298
Abstract: Electricity is generated from a range of bio-waste that is derived from a wide variety of biologically based feed stocks. Disposition of these biological products in capacity limited landfills creates a myriad of adverse environmental impacts. Atmospheric pollutants from landfill decay ground and surface water contamination and uncontrolled bacteriological and algae growth. These waste streams represent both assets when used as energy or an environmentally liability when improperly or excessively disposed. In Hong Kong bio-waste, which are derived from, both bio-waste and waste materials are dumped in landfills at various places and there is no further utilization. It applies to the sewage water treatment, animal slurries. The uses of bio-waste as generating electricity and other forms of energy can utilize the wastes and bio-waste, which give clean environmental and economical benefits. Environmentally the benefits of bio-waste can be significant in terms of greater diversity in utilization of waste, reducing in the emission of green house gases and reduction of pollution such as acid rain giving clean place to live. Waste management throughout the world is undergoing a period of rapid change. In Hong Kong all recognize the need to establish proper management of waste to minimize its environmental impact. Diversifying waste disposal options, recycling wastes into energy providing local employment and economical activity and diversifying the energy base. In Hong Kong the amount of municipal solid we depose of everyday has risen from 12,500 tones in 1989 to 16,000 tones in 1997. This is enough to fill 170 double-decker buses. As a result Hong Kong is running out of land for waste disposal. If this trend continue our landfills will be exhausted by 2015 if nothing is done on waste reduction. Finding sites for new landfills will be a dounting task. The reformation of wastes into usable forms can be a difficult task, though, when faced with present environmental, technical and economic constraints. In this work the energy conversion from bio-waste has been paper designed based. The figures and data are collected and assumptions are made from various resources and then integrated into Hong Kong environment. The gasification of these carbonaceous solids into energy has been demonstrated to provide a direct, cost effective, available and environmentally sound method of disposal. Gasifiers have a number of advantages for use in advanced bio-waste power systems, including reduced emissions, increased efficiencies, and flexibility for use with a variety of bio-waste feedstock. Emissions from advanced power systems; gas turbines are extremely low compared with conventional power systems. Furthermore, these systems can achieve high efficiencies. Replacing less efficient conventional boilers with advanced bio-waste gasifier or gas turbines can increase the amount of electricity produced from bio-waste by 50% or more. For even higher efficiency, the gas-turbine cycle can be combined with the steam cycle in an integrated gasifier combined-cycle. The advantage of this technology is decentralized energy conversion system, which operates economically even for small scale. Technologies such bio-waste gaisfication, which allows utilization of bio-waste fuels, are of great importance.

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