Mussa, Tigist (2015) Application of Cogeneration at Industries in Ethiopia Case Study - St. George Brewery. Masters thesis, Addis Ababa University.
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Abstract
This thesis is about a research carried on at St. George Brewery on the application of cogeneration. The aim is to assess opportunities of conserving wasted resources and implementing onsite energy generation. Through data collection and analysis it is found that the brewery has been wasting biogas resource that can be used in renewable resource based combined heat and power (CHP) system. The CHP system is realized by modifying the existing diesel engine to pilot ignited dual fuel engine type. The engine is modified by adding a T-junction biogas-air mixer. This approach reduces total consumption of diesel fuel by 20% as diesel fuel is used to ignite biogas-air mixture. Economizer is then used as a heat transfer component to recover the heat from engine exhaust system. The renewable resource based CHP system is analyzed using Homer software to obtain its cost; Net Present Cost and Cost of Energy (electrical). From the analysis, it is found that the net present cost of the system is 15,281,822 USD and cost of energy is 0.038USD/Kwh. The feasibility of the proposed system is studied by its deviation from the existing system in terms of energy and monetary saving and also through its benefit to cost ratio. Compared to the grid system, the cost of energy of the CHP system deviates by 0.018USD/Kwh. The lower cost of energy of the CHP system and its additional heat recovery system adds up to its feasibility. The benefit to cost ratio of the CHP system is calculated to be 3.85. In addition to biogas resource, water from the secondary treatment plant is further studied by getting the sample tested at Ethiopian Health and Nutrition Research Institute to see if it is can be used at different sections of the brewery. From the test result it is found that the water can be used for cleaning purpose and for further industrial applications contaminants need to be removed. In this study, it is found that there is good possibility of using renewable resource based CHP system at St. George brewery which will increase the self sustainability of the brewery in terms of generating their own heat and electricity. In the process, potential wastes such as waste heat and biogas can be turned to valuable products.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Biogas, Cogeneration, Renewable resource based CHP, Pilot ignited dual fuel engine, Waste water treatment, Economizer |
| Subjects: | H Social Sciences > HD Industries. Land use. Labor H Social Sciences > HD Industries. Land use. Labor > HD28 Management. Industrial Management Q Science > QA Mathematics > QA75 Electronic computers. Computer science T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Africana |
| Depositing User: | Andriamparany Edilbert RANOARIVONY |
| Date Deposited: | 26 Oct 2018 14:38 |
| Last Modified: | 26 Oct 2018 14:38 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/7059 |
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