Method for optimizing natural gas liquefaction process technological parameters based on genetic algorithm

Abstract

The invention discloses a method for optimizing the natural gas liquefaction process technological parameters based on the genetic algorithm. According to the method for optimizing the natural gas liquefaction process technological parameters based on the genetic algorithm, on the basis of an original technological process, the genetic algorithm is introduced, a corresponding original genus, a fitness judgment formula, the cross-over rate, the aberration rate and the end condition are established for each set of parameters based on the genetic algorithm in the process of optimization of the process technological parameters, genetic algorithm optimization operation is conducted, and finally the optimal genes are obtained and used as the optimal technological parameters of the natural gas liquefaction process. Under the condition that the inherent characteristics of all devices of a system and other design regulations are met, the energy consumption generated in the natural gas liquefaction process is reduced. Meanwhile, the method for optimizing the natural gas liquefaction process technological parameters based on the genetic algorithm has the advantages of being supermatic in intelligent optimization, capable of improving the optimization efficiency, and high in global superiority and universality. According to the method for optimizing the natural gas liquefaction process technological parameters based on the genetic algorithm, the optimization range covers all the technological parameters of the process, and global optimization is really achieved through interrelation of the parameters. The method for optimizing the natural gas liquefaction process technological parameters based on the genetic algorithm can also be applied to various optimization objects, and therefore the universality of natural gas liquefaction technological parameter optimization is improved.

Description

technical field [0001] The invention relates to the field of natural gas liquefaction, in particular to a method for optimizing process parameters of a natural gas liquefaction process based on a genetic algorithm. Background technique [0002] Natural gas liquefaction reduces the temperature of natural gas to below -160°C through refrigeration, and condenses the gas into liquid. The volume of liquefied natural gas is 1 / 600 of the original gaseous state, which is easy to transport and use. However, the natural gas liquefaction process consumes a large amount of energy. How to optimize the process parameters of the liquefaction process and reduce the energy consumption in the natural gas liquefaction process is the focus of natural gas liquefaction technology research. [0003] The process parameter optimization of the natural gas liquefaction process is to adjust and optimize the operating parameters of the liquefaction system (such as material temperature and pressure, comp...

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Problems solved by technology

[0006] After the process parameters of the natural gas liquefaction process are determined, the obtained process energy consumption is used as the objective function, which is highly nonlinear and highly discrete, and it is not easy to obtain the gradient information of the objective function solution, so it will be very troublesome to use the usual optimization method

The natural gas liquefaction process also has a lot of process constraints. The process parameters of a single equipment usually affect the operating conditions of the next equipment. Traditional optimization methods cannot respond to these design regulations, so they cannot meet all the constraints.

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