Investigation of opportunities for Increased Power Generation at Sävenäs Waste-to-Energy Plant

Examensarbete för masterexamen

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Type: Examensarbete för masterexamen
Master Thesis
Title: Investigation of opportunities for Increased Power Generation at Sävenäs Waste-to-Energy Plant
Authors: Giolitti, Beniamino
Abstract: There are many economical and technical incentives to increase the efficiency of energy conversion plants. In this work we analyze these factors for Renova’s waste incineration combined heat and power plant in Göteborg. The company is interested in identifying solutions to improve the facility’s power-to-heat ratio in connection with plans to increase the incineration capacity. The plant has five main sections: waste pre-treatment, waste incinerator boiler with energy recovery for production of electric power and heat, flue gas cleaning, water cleaning, and cooling system with heat recovery for district heating. With a current incineration capacity of 460.000 tons per year, the plant can handle waste for around 920.000 person equivalents. At full load, the plant can produce 32 MW of electrical power and 150 MW of heat delivered to the local district heating network. The goal of this master thesis project was to investigate the potential for increased electric power generation at Renova’s waste-to-energy in Sävenäs, Göteborg associated with an increase of the waste handling capacity of the facility. The project includes an analysis of the steam and power section of the waste-to-energy plant in Sävenäs. GateCycle power plant simulation software was used to determine energy and mass balances for the steam system of the plant. Based on this simulation model and characteristics of the existing plant, different opportunities for increasing electric power production were investigated, including improved boiler steam data and increased steam turbine capacity. Five configurations were analyzed and compared on the basis of annual production of electricity and district heat, annual average electrical efficiency, and annual revenue from sales of electricity and district heat. The results of the project indicate that according to the plant characteristics and operating limits, the most attractive solution is to build the new incineration line boiler with advanced boiler technology and steam data of 450° C and 60 bar. The steam can be delivered to a new power island (steam turbine, district heating condenser, feedwater preheater) integrated with the existing steam system. In this way the annual electricity production can be increased together with the annual average electrical efficiency and the revenue from heat and electricity sales.
Keywords: Kemiteknik;Chemical Engineering
Issue Date: 2007
Publisher: Chalmers tekniska högskola / Institutionen för energi och miljö
Chalmers University of Technology / Department of Energy and Environment
Collection:Examensarbeten för masterexamen // Master Theses

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