Method and system for flame photometric online detection of sulfur-containing compound content in natural gas

Abstract

The present invention provides a system for on-line flame photometric detection of the content of sulfur-containing compounds in natural gas. The system comprises a sampling device, a depressurization system, a chromatographic column system and a flame photometric detector; wherein the chromatographic column system is provided with a carrier gas input line, and a chromatographic column, comprising a boiling point column and a sulfur column, is provided in the chromatographic column system; the output port of the sampling device is in communication with the input port of the depressurization system through a first delivery pipeline; the output port of the depressurization system is in communication with the input port of the boiling point column through a switchable connecting pipeline; the input port of the boiling point column and the input port of the sulfur column are each connected to the carrier gas input line through a switchable connecting pipeline; the output port of the boiling point column is in communication with the input port of the sulfur column through a switchable connecting pipeline; the output port of the sulfur column is in communication with the input port of the boiling point column through a switchable connecting pipeline; and the output port of the boiling point column and the output input port of the sulfur column are each connected to the input port of the flame photometric detector through a switchable connecting pipeline.