Abstract
One of the problems in the implementation of natural gas liquefaction technology in a closed high-pressure cycle is the accumulation of low-boiling components, in particular, nitrogen in the circulating gas stream, as a result of which the throttle effect decreases and, accordingly, the specific energy consumption of the liquefaction plant increases. The nitrogen concentration influence on the liquefaction plant operation in the throttle cycle of high-pressure natural gas with a nitrogen content of 0 to 6 % was studied using the GazCondNafta software system for computer simulation of technological processes. To solve the problem of liquefaction of nitrogen-containing gases, a liquefaction scheme with two stages of throttling and intermediate separation with nitrogen vapor stripping is proposed. The effect of gas pressure in the nitrogen separator was determined from the point of view of minimizing losses of the main component of natural gas — methane — with stripping gas with a relatively small decrease in energy efficiency. Bibl. 14, Fig. 6, Tab. 4.
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