engleski

Application of Waste as a Local Energy Source in the District Heating Systems

In last decades EU is faced with increasing challenges in the energy sector. One of the ways for solving these problems is identification of the potential for the application of high- efficiency cogeneration and district heating which is emphasized in Article 14 of Energy Efficiency Directive. This path includes the usage of local energy sources such as waste and waste materials. Energy recovery of waste is also one of the possible solutions for the problem of waste disposal which is currently a burning issue in Croatia. The aim of this study is to model the waste management system (WMS) that could on economically, environmentally and socially acceptable way, solve the problem of waste disposal in the City of Zagreb. Also, this system aims to satisfy part of the city energy needs through energy recovery of the residual waste, which is advocated by the current waste management strategy which envisages the construction of a waste to energy (WtE) plant. As a first step, an economic evaluation of constructing a WtE plant is conducted. It is based on regression analysis from data on existing power plants and on the locally dependent data. For this purpose projections of quantity and heating value of waste are conducted. The projections are based on socio- economic data, waste management plans and European legislation. As the next step it is planned to perform an economic optimisation of the size of WtE plant with a heat storage based on local heat demand. To model a WMS a LCA methodology and the LCA-IWM model is chosen. This model along with environmental sustainability examines economic and social sustainability of the WSM. Necessary input data for this model consist of temporary storage, collection, transport, processing and waste disposal data. By using this model, different waste management scenarios can be compared which can help in determining the best suitable configuration of WMS. As the WMS is considered as a part of energy system, they need to be modelled as a one integral system. For this task one of the existing energy system models will be used (e.g. EnergyPlan) which will be linked with the WMS model. This way a model of integrated system will be established which will help to keep track of waste and energy flows and will enable evaluation of impact of integration of some other technologies in the existing system(s). Parallel to this research, development of decision-support optimisation model in WMS is considered which will help determine most acceptable location of WMS components (treatment plant, recycling centre, transfer station, etc.) in urban areas. Expected result of this research is to have integrated model that will encompass waste collection, transportation, treatment and disposal as well as the heat demand, production and balancing.

waste management system ; district heating system ; waste model ; energy model ; model linking

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