Mean sampling system and method

Abstract

The invention discloses a mean sampling system and a method. The mean sampling system comprises: a sampling pump, an air pump, sampling units and a vacuum pump. The sampling unit comprises a samplingvalve, an air valve, a sampling tank, a sample feeding valve and an exhaust valve. The sampling tank is a closed container. The sampling pump communicates with the sampling tank through the sampling valve. The air pump communicates with the sampling tank through the air valve. The sampling tank communicates with the exhaust valve. The exhaust valve communicates with a total exhalation valve and avacuum pump valve separately. The vacuum pump valve communicates with the vacuum pump. The sample feeding valve communicates with the sampling tank and a detecting device separately, and is used for controlling the sample to be sent to the detecting device. The sampling units are plurality in number. According to the mean sampling system and the method, a plurality of sampling units alternately feed sample to the detecting device, so that the online monitoring can be carried out without interruption; the mean sampling method is adopted, the sample concentration value monitored in real time isthe average value of the sample concentration in the sampling period, so that the actual value of the sample concentration in the sample period can be more accurately reflected, and the accuracy of the monitoring result is improved.

Description

technical field [0001] The invention belongs to the field of environmental monitoring equipment, and in particular relates to an average value sampling system and method which can be used for continuous monitoring. Background technique [0002] Existing on-line gas monitoring equipment detects collected samples through a gas chromatograph, and the sampling method of the gas chromatograph is single-point sampling or multi-point sampling in space. However, whether it is single-point sampling in space or multi-point sampling in space, the acquisition is a sample at a certain moment, that is, instantaneous sampling. [0003] During monitoring, the concentration value of the sample at an instant represents the concentration value of the sample in the sampling period, and then the concentration value and the total emission of the sample in the entire test period are investigated. As far as the actual situation of the current factory process or environmental conditions is concerne...

AI Technical Summary

Problems solved by technology

As far as the actual situation of the current factory process or environmental conditions is concerned, the sample concentration at the sampling point has certain fluctuations. Therefore, the sample gas test result of the instantaneous sampling can only represent the sample gas concentration at the sampling instant. The concentration of the sample gas is not representative, let alone the total amount of sample emissions during the sampling period

Existing monitoring equipment cannot realize real-time and continuous monitoring of gases, and there are sampling blind spots

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