Total hydrocarbon tester having on-line attenuation function

Abstract

The invention discloses a total hydrocarbon tester having the on-line attenuation function. The tester comprises a sampling pipe, a pump, a hydrogen flame ionization detector, a compressed air bottle and a mixed gas chamber. An input end of the mixed gas chamber is connected with the sampling pipe, the other input end of the mixed gas chamber is connected with an air pipe, and the air pipe is connected with the compressed air bottle and provided with an air flow control device. The output end o the mixed gas chamber is connected with the pump through a mixed gas flow control device, and the pump is connected with the hydrogen flame ionization detector. Sample gas enters the mixed gas chamber, is mixed with clean air and reaches the hydrogen flame ionization detector under the action of the pump, and the hydrocarbon content of the sample gas is tested. The mixed gas flow control device and the air flow control device cooperate to control the proportion of the sample gas to the clean air, and the on-line attenuation function is achieved. By means of the total hydrocarbon tester, the concentration of hydrocarbon in the sample gas entering the hydrogen flame ionization detector is lowered in a quantitative mode, and shutdown of the tester due to overload or insufficient oxygen in the sample gas or other reasons is avoided.

Description

technical field [0001] The invention relates to a total hydrocarbon detector, in particular to a total hydrocarbon detector with an online dilution function. Background technique [0002] During the operation of petrochemical equipment, hydrocarbon leakage occurs due to failure of sealing materials and other reasons. It is currently a relatively common practice to use a total hydrocarbon detector to detect the leakage of the equipment. The commonly used total hydrocarbon analyzer is composed of sampling tube, pump, hydrogen flame ion detector and other supporting parts. During the detection process, because the sampling port is in contact with the high concentration of hydrocarbon components in the leaked gas or because the matrix of the leaked gas is an inert gas such as nitrogen, the hydrogen flame ion detector is often turned off instantly, requiring a long period of cleaning and re-ignition, reducing the detection efficiency. [0003] At present, the existing solutions...

AI Technical Summary

Problems solved by technology

However, in practice, it is found that the filter activated carbon is easy to be saturated and difficult to find, the gas path resistance is difficult to adjust, and the dilution ratio is not accurate, etc.

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