Sampling flow control device and gas analyzer

Abstract

The invention discloses a sampling flow control device, which comprises a sample gas inflow channel, a carrier gas inflow channel, a flow control unit and at least two fluid control units for controlling a communicated state of a path, wherein the sample gas inflow channel and the carrier gas inflow channel are communicated with the inlet end of the flow control unit through at least one fluid control unit respectively, and the outlet end of the sample gas inlet flow and the outlet end of the flow control unit are communicated with at least one fluid control unit respectively to form the gas flow path of which a sample gas flow or a carrier gas flow can be selected to be calibrated by the flow control unit. The sampling flow control device is used for automatic calibration and checking forsampling of a sample gas, so that long-term working stability and accuracy of sampling of the sample gas are ensured; the sampling flow control device is maximally used, so that the cost is reduced;the performance of the whole gas analyzer is ensured, and meanwhile, the service life of the flow control unit of the sampling flow control device is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of mercury monitoring in a flue, in particular to a sampling flow control device and a gas analyzer. Background technique [0002] Mercury is one of the air pollutants, and its main sources are natural formation, mineral combustion and mineral smelting. Mercury is a highly toxic and non-essential element that widely exists in various environmental media and food chains, and its traces are all over the world. The mercury cycle is a typical cycle of heavy metals in the ecosystem, and mercury migrates and transforms in the water body, soil, atmosphere and biosphere in its elemental state. Therefore, the emission of mercury in pollution sources must be monitored in real time. [0003] Existing mercury monitoring mainly adopts gas analyzer, including sampling part, enrichment desorption part and analysis part. By sampling the gas source, enriching and desorbing, carrying the carrier gas flow, and analyzing and...

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Problems solved by technology

[0004] The invention provides a sampling flow control device and a gas analyzer to solve the problem that the inflow flow rate of the sample gas is difficult to control in the existing gas analyzer; the sample gas rich in mercury is easy to corrode the flowmeter, which easily leads to the service life of the flowmeter low technical issues

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