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LOW EMISSION BIO ORC Final summary report Contract No. NNE5/2000/475 3 Generator (directly coupled) Regenerator Condenser District Heating Thermal oil cycle Thermal oil ECO Turbine G Thermal oil boiler Biomass Combustion air pre-heater Working principle of the 1,000 kWel ORC process in Lienz ORC- process Evaporator Furnace Silicon oil pump Economiser Flue gas Combustion air Figure 3: The ORC unit in the biomass CHP plant in Lienz has been in successful and almost continuous operation since February 2002. According to operation data already evaluated, the net electric efficiency of the ORC plant (= net electric power produced / thermal power input by the thermal oil) amounts to 18 % at nominal load and about 16.5 % at 50 % partial load at feed water temperatures of 85 °C. This underlines the excellent partial load behaviour of this technology which is especially relevant for heat controlled operation of the overall CHP plant. Moreover, the new biomass CHP technology based on the ORC process is an economically and technologically interesting solution for small-scale applications due to the fact that it allows highly automated and multi-fuel operation with relatively low operation and maintenance costs. Thermal oil ECO Radiation and heat losses 8% Thermal output 75 % Electricity output 14 - 15 % Heat and electricity losses ORC 2- 3 % Hot water ECO Biomass input (NCV) = 100 % Thermal oil boiler Combustion air pre-heater ORC process Figure 4: Energy flow chart for nominal load of the CHP plant Lienz 140 120 100 80 60 40 20 Figure 5: 0 9:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 17:30 18:00 18:30 19:00 19:30 20:00 Comparison of the process control systems between 16-12-2002 and 19-12-2002 regarding relevant combustion process parameters of the thermal oil boiler at nominal load conditions without Fuzzy on 16-12-2002_negative furnace pressure [Pa] without Fuzzy on 16-12-2002_O2 concentration flue gas outlet [vol%] with Fuzzy on 19-12-2002_negative furnace pressure [Pa] with Fuzzy on 19-12-2002_O2 concentration flue gas outlet [vol%] The principle of the Fuzzy Logic control system is basically the existence of a linguistic and a technical level. Fuzzyfication and defuzzyfication are used for the smooth transition of information between the linguistic base of the negative furnace pressure [Pa] O2 concentration flue gas outlet [vol%]PDF Image | FUZZY LOGIC CONTROLLED CHP PLANT FOR BIOMASS FUELS
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