The article describes a methodological approach to choosing the optimal method of the natural gas liquefaction process in Arctic conditions. The choice of liquefaction technology for liquefied natural gas (LNG) production in the Arctic zone is justified, patterns of LNG production emissions are determined and measures to reduce them are proposed. A simulation model of the chosen technology has been formed for the composition of natural gas from a promising field and the target parameters have been determined for optimizing the liquefaction process. A method has been developed for the estimated calculation of the heat transfer surface area of multithreaded heat exchangers, which can be applied to both plate-fin and spiral heat exchangers. The calculation method is based on the principles of pinch analysis, and therefore, at the initial stage, it enables to perform an assessment without calculating the design of the devices. An economic assessment was carried out for the formed matrix of options, based on the results of calculations of net present costs and total greenhouse gas emissions, the optimal solution was chosen for the process. Based on the results of calculations of net present value and total greenhouse gas emissions, a balance of capital and operating costs was achieved and the optimal solution was chosen for the process.
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