METHOD OF PURIFYING NATURAL GAS FROM HEAVY HYDROCARBONS Russian patent published in 2017 - IPC F25J3/00 B01D45/06 

FIELD: oil and gas industry.

SUBSTANCE: natural gas is extracted from main gas line, pre-dried, water vapours are removed and sent to a turbo-expander for subsequent cooling. The gas extracted from the network before liquefaction is directed to a screen filter casing, the direction of the gas flow is abruptly changed by 90°, which results in separation of heavy hydrocarbon particles from main gas flow which are accumulated in filter casing and drained through a special hole therein. Then the flow is fed to a guide apparatus casing of the turbo-expander and the flow is cooled during saponification of the outer surfaces of the guide apparatus slats. Heavy hydrocarbons not separated from the main stream in the filter are condensed and accumulated in the lower part of the guide apparatus casing, and extracted through a special hole therein.

EFFECT: increased efficiency of natural gas purification from heavy hydrocarbons by using natural conditions for separation of gas impurities introduced into the expander.

4 cl, 1 dwg