Wale Aboyade's thesis - lumes

More documents

Recommendations

Info

Akinwale Aboyade, LUMES Thesis, 2003/2004 4.1.3.3 Methane emissions from Olusosun SWDS Narrowing down to Olusosun SWDS where even more data is available, and where the emission model used (the first order decay (FOD)model) is a better representation of the fate of CH 4 emissions in landfills, the results are as shown in the charts below under the following assumptions. L o – Methane generation potential (same as MCF*DOC*DOCF*16/12 in the default method) and here assumed to be about 150m 3 /Mg. A conservative estimate when compared with 1(0m 3 /Mg for Brazil which has a similar waste composition ( Mailly, 2004). K- methane generation constant for lack of data is assumed to be the default suggested by IPCC - 0.05 80000 1 1 40000 1 0 1 1991.00 2000.75 2010.50 2020.25 2030.00 Years Figure 4.6 Methane emissions from Olusosun SWDS (Source: own construct) The graph shows methane emission from Olusosun reaching its peak of about 76,000 tonnes of methane in 2014 thereabouts with an average annual emission of 63,000 tonnes during the project’s lifetime. It also shows that Olusosun will still be generating emissions well beyond 2030. A sensitivity analysis varying k and L o by ±15% shows that this varies from a low of 47,000 tonnes to a high of 78,000 tonnes CH 4 . 4.1.3.4 Utilization potential Although there are various uses of methane generated from landfills, this study will only consider flaring and electricity generation. Allowing for a 25% uncertainty in the following figures and 34
Akinwale Aboyade, LUMES Thesis, 2003/2004 supposing the efficiency of the collection system in place is 60%, the potential electricity generation from Olusosun is depicted in the chart below(figure 4.4) under the following other assumptions. An energy generation potential of 33.8MJ/m 3 of methane, electricity conversion efficiency of internal combustion engine is 25% with an availability factor of 85% (i.e. 15% downtime) 120,000.00 14 100,000.00 12 80,000.00 10 60,000.00 40,000.00 20,000.00 0.00 Figure 4.7 Potential electricity generation from Olusosun SWDS From the graph we see that should the plant start operating in 2005, it is possible to produce about 70,000MWh from say, an internal combustion engine with installed capacity of about 8MW, and to do until 2005.The extra gas is flared. CERs are generated whether the methane is flared or combusted as in both cases methane is destroyed to form the less potent CO 2 and water. According to the model, the landfill could generate about 544,000 tCO 2 e annually or up 13.124 million tCO 2 e of methane emissions over 21 years. According to CDM regulations, CER’s are also generated from the CO 2 avoided through the displacement of grid based electricity 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 40,000.00 35,000.00 30,000.00 25,000.00 20,000.00 15,000.00 10,000.00 5,000.00 0.00 2017 2019 2021 2023 2025 8 6 4 2 0 2004 2006 2008 2010 2012 2014 2016 2018 2020 2022 2024 Potential electricity production in MWh Potential installed capacity 0.00 Figure 4.8 Potential ER’s from Olusosun 800,000.00 700,000.00 600,000.00 500,000.00 400,000.00 300,000.00 200,000.00 100,000.00 Estimated collectible methane (Tonnes) CO2 equivalent (Tonnes) 35
Page 1 and 2: The Potential for Climate Change Mi
Page 3 and 4: Akinwale Aboyade, LUMES Thesis, 200
Page 33: Akinwale Aboyade, LUMES Thesis, 200
Page 47: Akinwale Aboyade, LUMES Thesis, 200

Wale Aboyade's thesis - lumes

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?