Effective System Integration of Decentralised Biomass Cogeneration Plants
Strzalka, R., Strzalka, A., Kalina, J., Eicker, U.
This paper examines the potential of the greater integration of biomass-fired cogeneration plants based on Organic Rankine Cycle (ORC) technology in modern energy supply concepts, including methods of overcoming typical problems and implications for efficiency enhancement. The biomass infrastructure and energy generation technology needs to be continually adapted and upgraded if it is to meet the ever-increasing demands for energy services. Although decentralized energy supply schemes based on the ORC technology have proven to be efficient, many problems related to fluctuations in heat demand, indirect plant control and varying fuel properties still remain unsolved. Therefore, the aim of this study was to develop a multifunctional system tool, to allow an in-depth analysis of decentralized bioenergy applications and finally to aid in the design and operation of biomass-fired cogeneration plants. The paper describes the optimisation of biomass-based energy supply via innovative and novel components which will allow continuous control of the energy input at the plant. The integration of the energy input within the plant control system has shown to be certainly beneficial for achieving of stable working conditions and enhanced system efficiency of decentralised applications. The presented optimisation approach was not only based on the implementation of new hardware control system components, but it also included a high-effective model predictive control. The main scientific target of the presented methodology was the development of the predictive mathematical models of biomass-based energy conversion plants. New knowledge has been gathered in the fields of process identification, process control algorithms and load management. The main innovative aspect of the study is the development and creation of a simulation environment for the performance analysis of district heating supply systems based on grid simulations. For this, a modular application for the simulation of load profiles was applied, in which 3D geo-data building models and detailed hydraulic grid infrastructure simulation were integrated within an innovative urban energy management platform. This enabled not only the analysis of load management scenarios, but also reliable heat demand forecasts in order to estimate the optimal control parameters for the predicted load characteristics. The main target of the research work was the improvement of the sustainability of biomass-based energy supply concepts. The CO2 emissions savings potential which was mobilised as the result of the project activities is related mainly to the fuel savings linked to the enhancement of the annual system efficiency. In the case of an analysed ORC pilot plant with 1 MW electric output, the fuel demand could be reduced by 6,300 m3 wood chips yearly. The substitution of fossil fuel-based heat and electricity which has been achieved in the course of the optimisation has enabled a summary emissions reduction of 583 tons CO2 yearly.
cogeneration, modelling, biomass combustion
Biomass Conversion Technologies for Heating, Cooling and Electricity
Biomass and Bioliquids Combustion for Small and Medium Scale Applications
25th European Biomass Conference and Exhibition
629 - 633
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