Speed Control Modeling of Modular Screw Expander Generation System

Abstract

Abstract: Abstract： A dynamic response model of screw expander was established to study the speed control method of the modular screw expander generation system based on the organic Rankine cycle(ORC). A new method of fixed boundary multisection model was adopted in building the expander model. Because the modular ORC screw expander generation system does not have the steam regulating valve, the engine speed cannot be controlled directly by regulating the steam flow rate. Therefore, an indirectly method for regulating heat fluid flow rate was adopted. When the heat fluid flow rate was regulated, the steam rate and enthalpy changed at the same time. So, two types of physical model was established based on it. A simulation model was established in Matlab and the control model was tested and optimized. The simulation result show that this indirect method to control the speed of the engine is feasible and the steam rate plays a major role in the speed control system.

Key words: Key words： modular unit, organic Rankine cycle (ORC), screw expander, speed control

CLC Number:

TK 115

BAO Wenlong,YU Yuefeng. Speed Control Modeling of Modular Screw Expander Generation System[J]. Journal of Shanghai Jiaotong University, 2016, 50(04): 521-527.

References

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