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Circulating fluidized bed (CFB) combustion is a new clean coal technology with advantages of wide fuel flexibility and low pollutant emissions. The bed temperature of CFB boilers is an important factor that influences operating security and pollutant emission generation. An accurate model to describe the dynamic characteristics of bed temperature is beneficial in reducing temperature fluctuations...
This paper investigates gain scheduling control strategy for ORC (organic Rankine cycle) based WHECSs (waste heat energy conversion systems) over a wide range of operating conditions. A low order physical model is first developed for ORC based WHECSs. Then the nonlinear dynamics of the WHECS are formulated by an affine LPV (linear parameter varying) system. The generated offline LPV system is characterized...
In this paper, the structure and control tasks are briefly summarized for ORC (Organic Rankine Cycle) based WHECSs (waste heat energy conversion systems). A control-oriented physical model is established for WHECSs. The energy conversion efficiency of ORC systems is investigated. A constrained model predictive controller is then presented to control WHECSs. Simulation results show that the exhaust...
The electricity to thermal energy output ratio is an important impact factor for the operating modes and performances of combined cooling, heating and power (CCHP) systems. If the energy requirements of users are managed to just match this ration, the system efficiency would reach the maximum. However, due to the randomness of load demands, this situation is rare to be achieved in practice. To solve...
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