«Automation and Informatization of the fuel and energy complex»

Increasing the energy efficiency of the technological process of small-tonnage LNG production using domestic software for technological modeling

UDC: 533.2:665.632.078
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: small-scale LNG, energy efficiency, LNG plant at GDS, throttle cycle, process modeling, simulation model, SIMBA

Annotation:

The article considers the problem of increasing the energy efficiency of a small-scale natural gas liquefaction complex with a capacity of 21,5 thousand tons/year. To analyze the operation of the unit, operational data were collected from the process control system and, based on them, a simulation model was created in the domestic SIMBA software package. Using the model, calculations of the material and energy balance were performed, the main limitations that reduce the efficiency of operation were identified: high gas losses for the regeneration of adsorbers and in the thermal insulation system, insufficient efficiency of the refrigeration cycle, limited return of boil-off gas to the network and reduced productivity of the compression unit. Based on the results obtained, measures for modernization were proposed: using boil-off gas for the unit's own needs, installing an adjustable throttle, improving the characteristics of the refrigeration cycle, increasing the LNG storage pressure and replacing the thermal insulation. In addition, an algorithm for calculating productivity based on APCS data, a decision support system and a training complex for operators were developed. The implementation of the proposed measures will increase productivity and reduce energy costs during operation of the unit.

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