The invention belongs to the technical field of
environmental monitoring, and relates to a dual-channel gas state mercury
exhaust gas sampling
system. The dual-channel gas stage mercury
exhaust gas sampling
system comprises a sampling gun, a heat tracing pipeline and a sampling
host machine, wherein two sampling pipes can be installed on the sampling gun. A water removal device and an acid removal device are sequentially connected between the heat tracing pipeline and the sampling
host machine. The sampling
host machine comprises a sampling pump, a flow control valve used for regulating sampling flow, and a gas flow metering device, wherein the sampling pump, the flow control valve and the gas flow metering device are communicated through pipelines. Vacuum degree
control valves are connected at two ends of the sampling pump in a parallel mode. The gas flow metering device comprises a dry-type gas flow meter, a rotary coder and a counter, wherein the rotary coder is fixed on a transmission shaft of a counting plate of the dry-type gas flow meter, a
signal output by the rotary coder is sent to the counter, and the
counter measures volume of gas according to the output
signal of the rotary coder. According to the dual-channel gas state mercury
exhaust gas sampling
system, accurate measurement of gas flow can be achieved and the sampling pipes can be effectively protected.