Numerical method for optimizing performance of organic Rankine cycle system

Abstract

The invention discloses a numerical method for optimizing the performance of an organic Rankine cycle system. The numerical method comprises the steps of optimizing cycle parameters to improve the system performance, and optimizing cycle working medium components to improve the system performance. According to the step for optimizing the cycle parameters to improve the system performance, parameters which have great influence on the system performance are selected, sensitivity analysis is conducted on the parameters, a sensitivity change interval serves as an independent variable change interval, and the system performance is optimized through an optimization algorithm; and according to the step for optimizing the cycle working medium components to improve the system performance, control over the working medium components is achieved by optimizing the mass flow / molar flow of all the components in a working medium, the mass flow / molar flow of all the components of the working medium serves as an independent variable, a system performance evaluation index serves as a dependent variable, and the system performance is optimized through an optimization algorithm. According to the numerical method for optimizing the performance of the organic Rankine cycle system provided by the invention, optimization work of system node parameters and working medium components can be rapidly completed, the system design optimization process is simplified, and the participation degree of technicians in the optimization process is reduced.

Description

technical field [0001] The invention relates to the field of recovery and utilization of LNG cold energy and low-temperature waste heat, in particular to a numerical method for optimizing the performance of an organic Rankine cycle system. Background technique [0002] According to the 2020 report of the International Organization of Importers of Liquefied Natural Gas (GIIGNL), global LNG imports reached 354.7 million tons in 2019, with an annual growth rate of 13%. Liquefied natural gas is playing an increasingly important role in the global energy market due to its high storage energy density, ease of transportation and low greenhouse gas emissions. [0003] Under one atmospheric pressure, the liquefaction temperature of natural gas is about -162°C, so the liquefaction process of natural gas is very energy-intensive. With the current LNG production process, the energy consumption of producing one ton of LNG is about 850kW·h. At the LNG receiving end, LNG cannot be used as...

AI Technical Summary

Problems solved by technology

Generally speaking, whether it is improving process design or optimizing node parameters, rich experience is required, and the optimization effect is often not satisfactory

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