Model Based Regulation Plants (MBR)
Polytechnik is currently the only provider of a functioning model-based plant regulation worldwide. A programmable logic controller (PLC), which translates oxygen inflows, combustion chamber temperature, flue gas recirculation, gas and combustion air temperature, material quantity and humidity, inlet and return flow temperature, steam and system pressure and consumption of the individual consumers into command signals, is used for the fully automatic control and regulation of the energy plant. Plant operation runs fully automatic, from the supply of biomass to the control of energy producers, tuned to the demand of consumers to whom the energy is supplied.
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This regulation, which was developed by us and was already put to use multiple times, utilises a physical model of the firing and the heat exchanger in order to internally predict the required parameters (ventilators’ speeds, flap positions, fuel supply, etc.) as precisely as possible. Consequently, the regulation systems only have to compensate for the small deviations between the calculation model and the real plant, which enables a more precise adherence to the setpoint values.
Changes in the fuel characteristics are detected and factored in automatically by the regulation, which ensures stability of the plant’s operation. During comparative measurements, savings of fuel and subsequently operating costs of 3 to 5% have been established, compared to conventional regulations.
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