District heating strategy plan for Lithuania. Report B. Proposals for rehabilitation projects for Kaunas

摘要

The proposals dealt with concern various parts of the district heating system from the production of heat at the boiler houses and at the cogeneration plants in Kaunas to the consumption at apartment blocks and other large subscribers. It is recommended that installation of metering equipment at boiler houses should be given high priority. In addition to an analysis of industrial steam demand- and profile in order to identify potentials for reduced steam production, an improvement of water treatment at boiler houses (Through installation of partial flow filtration, dosing equipment and use of other chemicals than the ones applied at present) to obtain a longer service life of pipesets. The coordination of the overall district heating system in Kaunas, and a number of actions aimed at increasing boiler efficiency and focusing on burners, pumps and instrumentation, insulation, cleaning and maintenance are necessary. It seems likely that energy savings are feasible at boilers of comparatively low energy efficiency in Kaunas, and at the cogeneration plant. A network analysis of the pipe system is necessary in order to prepare other investment projects such as main pump improvements and reduction of temperature level in mains. Installation of frequency converters for the pumps should be considered. Installation of meters at substations is more feasible than installation of meters at each individual apartment block. Valves should be installed for differential pressure control and also flow limiting valves at the substations in Kaunas in order to prevent situations of inadequate heat supply. Installation of new heat load control equipment in each building involves a long repay-period. General aspects of the district heating sector in Lithuania are addressed, such as changing of organizational structure and of tariffs. (AB)