Assessment of Performance of Selected Bagasse-based Cogeneration and CO2 Mitigation Potential in Thai Sugarcane Industries

Name: Prachuab Peerapong

keyword: Bagasse-based cogeneration

Abstract: This study includes: 1.) a technical evaluation of the performance of two bagassebased cogeneration power plants using bagasse and sugarcane residues as fuel; 2.) a study of the potential of these residues in the Thai sugarcane industry of Thailand; 3.) and study of CO2 mitigation through CDM potential in sugarcane industries in Thailand. The technical evaluation is based on both the first and second laws of thermodynamics. The study proposes the alternative cases of cogeneration operations by increasing inlet temperatures and pressures of the two power plants. The results show that for one of power plants, power plant A using a new boiler which of operating at 29 bar and 398 C has a first law efficiency of 73.19% and a second law efficiency of 23.12%. The other part of the power plant using an old boiler, which is operating at 29 bar and 367 C, has a first law efficiency of 54.75% and a second law efficiency of 17.34%. The other power plant, power plant B using boiler which is operating at 66.7 bar and 509 C has a first law efficiency of 64.06% and a second law efficiency of 24.76%. From the alternative cases, the optimal point of operation is at 29 bar, and 398 C for the new boiler and 70 bar, and 495 C for the old boiler for power plant A. The optimal point of operation is between 60 bar, at 476?C and 80 bar, at 514 C for power plant B. The financial study of bagasse-based power plant B was made. Four scenarios that proposed for financial evaluation. With the combined scenarios of adders and CDM incentives, the power plant has a net present value (NPV) of 19,687,000 US$, internal rate of return (IRR) of 13.65%, and a payback period of 7.27 years. The potential of bagasse and sugarcane residues as fuel for power generation is also studied. The study shown that Thailand has much potential of using sugarcane residues for power generation. The sugarcane production in the year 2008 is 73.5 million tons, The sugarcane residues has potential to produce the electricity to grid around 1,773 MWe per year. And the potential is projected to the year 2021, by assumption that sugarcane production in year 2021 will be increased 30% from that of the base year 2008. The potential by using sugarcane residues to produce the electricity to grid will rise to 2,284 MWe per year in the year 2021. The analyses of CO2 emissions of power plant B is used as a model to study for the potential of CO2 mitigation because this plant has already been certified for a CDM project. This project can mitigate CO2 emissions by around 117,158 tCO2 per year and has an avoided emission factor of 0.433 tCO2/MWh. By using the avoided emission factor from power plant B to study the potential of the other 46 sugar mills in Thailand, it was found that the potential of avoided emissions from sugarcane residues is 968,905 t CO2 y-1 or 0.42% of the total country GHG emissions in the year 2008. The potential will be 1,209,610 t CO2 y-1 in the year 2021.

King Mongkut's University of Technology Thonburi. KMUTT Library.

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Bundit Limmeechokchai

Role: Advisor

Created: 2009

Modified: 2011-04-25

Issued: 2011-04-17

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: JGSEE200

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Energy Technology and Management

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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