Optimization and control integrated design method for tail gas waste heat recovery organic Rankine cycle

Abstract

The invention discloses an optimization and control integrated design method for tail gas waste heat recovery organic Rankine cycle. The method comprises the steps of building a mechanism model of a tail gas waste heat recovery organic Rankine cycle system; designing a control structure of the organic Rankine cycle system, designing a controller and a corresponding control equation for the control structure, and forming a closed-loop control system by the designed controller and the mechanism model; selecting tail gas working conditions in a power change range of tail gas waste heat; according to the selected tail gas working conditions and the closed-loop control system, building an integrated optimization model comprising tail gas working condition uncertainty analysis and solving an optimal operation point and an optimal control parameter of the integrated optimization model under each tail gas working condition; and according to the optimal operation point and the corresponding control parameter obtained by optimization solving, obtaining optimal operation points and control parameters corresponding to other tail gas working conditions by utilizing a regression method. The method can improve the waste heat recovery efficiency of the organic Rankine cycle system and is small in online calculation amount and good in robustness.

Description

technical field [0001] The invention relates to the technical field of utilizing Rankine cycle to realize low-grade heat energy utilization, in particular to an organic Rankine cycle optimization and control integrated design method for tail gas waste heat recovery and utilization. Background technique [0002] Energy is the foundation of national economic development, but the high-speed consumption of energy has triggered the energy crisis in today's society. With the rapid increase of automobile production and sales, the energy consumption of the automobile industry accounts for an increasing proportion of the total energy consumption, and the issue of automobile energy conservation and emission reduction has attracted more and more attention. According to relevant studies, the power used for power output generally only accounts for 30% to 45% of the fuel combustion calorific value (diesel engine) or 20% to 30% (gasoline engine), while the heat discharged in the form of wa...

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Problems solved by technology

However, due to the use of static models, this type of method does not consider the uncertainty in the system and the performance of the controller. The optimal operating point obtained is not easy to reach within the constraint range or too many safety thresholds are considered in the optimization process. The operating point is not actual optimal

Another type of control method is to use the optimal control with the goal of net output power, but this type of method often has a large amount of calculation, and is not suitable for situations where the working conditions change rapidly and the calculation capacity of the on-board equipment is limited.

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