Online detection device for hydrogen chloride content in operation site

An on-line detection device for hydrogen chloride content in a working site belongs to the field of corrosive gas detection and comprises a hydrogen chloride gas detection pipe and a gas outlet pipe with a control valve, and gas to be detected in a gas pipeline in the working site enters the hydrogen chloride gas detection pipe through the gas outlet pipe. The hydrogen chloride gas is discharged from the gas outflow end of the hydrogen chloride gas detection pipe, enters a tail gas absorption system, and is discharged after being treated; and a volume flow meter is arranged on the gas outlet pipe. The trace chlorine detection device can directly detect trace chlorine contained in gas in process equipment or a pipeline on a working site, does not influence normal operation of the equipment in the detection process, has the advantages of small workload, simplicity in installation, low cost, timeliness and repeatable detection, improves the detection efficiency, reduces the labor intensity of workers, and reduce