Abstract
District heating technologies should comply with forthcoming strict regulations on emissions and energy effectiveness. The majority of the communal district heating systems in Poland still produce heat in coalfired boilers that are in many cases worn out and operated with low efficiency, which particularly occurs during off-season time. The paper deals with possible solutions for improving efficiency of coal-fires heat generating plants due to its reconfiguration by applying new heat generating facilities or new fuels - alternative to coal. The work concerns repowering the existing conventional heat generating plant according to chosen scenarios of the plant configuration meeting technical and environmental requirements forecasted for the year of 2035. The maximum demand for heat of the system supplied by the plant is 185 MW. Annual load of the particular units in analyzed plant, including cogeneration facility based on IC-engines and gas or steam turbines have been projected and interfacing of the units has been analyzed and discussed. Taking into account different technical configurations on one side, and different energy and fuel prices on the other side, the comparative cost-benefits analysis of the assumed scenarios has also been made.
Highlights
Despite the current changes in the world energy sector as well as the upcoming strategies for the period 2020-2050 [1], inefficient energy systems, including district heating (DH) systems, often based on solid fuels, mainly coal, still continue to dominate in the structure of the electricity and heat production systems in certain countries of the world, including countries in Europe [2]
Improving the district heating systems has become a tendency in Europe since at least 20 years
The investigation concerns retrofitting the existing conventional heat generating plant according to eight different scenarios of the plant configuration meeting technical and environmental requirements forecasted for the year of 2035
Summary
Despite the current changes in the world energy sector as well as the upcoming strategies for the period 2020-2050 [1], inefficient energy systems, including district heating (DH) systems, often based on solid fuels, mainly coal, still continue to dominate in the structure of the electricity and heat production systems in certain countries of the world, including countries in Europe [2]. Such systems require actions to increase efficiency of energy conversion processes, meet growing environmental concerns and to become more economically attractive. The hard coal remains dominant resource for decades, its share in heat production is expected to go down as stated in long-term forecasts available in [5]
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