Method for screening and optimizing methanation nickel-based catalyst formula based on ANN-NSGA-II

Abstract

The invention discloses a method for screening and optimizing a methanation nickel-based catalyst formula based on a neural network coordinated second-generation non-dominated genetic algorithm (ANN-NSGA-II), which proves the effectiveness of the strategy by screening a multi-additive combination formula and optimizing reaction process conditions. The method comprises the following steps: designing a plurality of test groups containing three additive elements (Re, W and Cs) by adopting a random test method to form an initial catalyst library; constructing a mathematical model of a methanationreaction system by adopting an artificial neural network (ANN), namely establishing a corresponding relationship between operation conditions and performance indexes; iteratively searching a Pareto optimal solution superior to reaction condition process parameters by an improved NSGAII multi-objective optimization algorithm, and finding a method with universality for effectively solving the optimization problem of the condition parameters in the future. According to the method, the model prediction precision and the catalyst screening efficiency are improved.

Description

technical field [0001] The invention relates to an ANN-NSGA-II-based method for screening and optimizing the formulation of a nickel-based methanation catalyst, which belongs to the field of modeling and optimization of complex industrial processes. Background technique [0002] Coal-to-natural gas (SNG) technology can convert coal resources into natural gas with no pollution and high thermal energy utilization efficiency, which is an important way to optimize the energy consumption structure, ensure my country's energy security, and reduce environmental pollution. The key technology of coal-to-SNG is methanation reaction, the core of which is the construction of catalyst. Loaded on Al 2 o 3 The Ni-based catalysts above are widely used in actual industrial production because of their advantages of high catalytic activity, good thermal stability, and low price, but sintering and carbon deposition are the main reasons for their deactivation. Therefore, it is of great signif...

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Problems solved by technology

[0003] The study found that it is undoubtedly very difficult to find the best formula from the vast array of additives only relying on experimental methods, which has become a bottleneck limiting the efficiency of catalyst research and development

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