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Nitrogen analyzer

An analysis device, nitrogen technology, applied in sampling device, electrical excitation analysis, material excitation analysis, etc., can solve problems such as difficulty in high-precision analysis

Active Publication Date: 2011-07-13
NIPPON SANSO CORP
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Problems solved by technology

[0007] For example, regarding the impurity nitrogen concentration of crude argon gas, the argon concentration in the crude argon gas is measured with a thermal conductivity type concentration meter on the one hand, and the oxygen concentration is measured with a zirconia oxygen meter or the like on the other hand. Nitrogen concentration (%) can be calculated from gas concentration and oxygen concentration, but it is difficult to analyze nitrogen gas from a few ppm to a few percent with high precision.

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[0044] figure 1 It is a system diagram showing the nitrogen analysis device of the first embodiment of the present invention. The nitrogen analyzer 10 can determine the impurity nitrogen concentration in the feed argon gas input from the channel 13 to the lower part of the argon column 12 installed in the air separation device 11 and the crude argon gas output from the upper part of the argon column 12 to the channel 14. The impurity nitrogen concentration in the nitrogen gas is appropriately switched and continuously measured, and the feed argon gas and crude argon gas are input to the nitrogen analysis device 10 from the sample gas input channel 16 through the gas switching valves 15a and 15b.

[0045] In the nitrogen analysis device 10, a pure oxygen input channel 21, an oxygen balance nitrogen input channel 22, and pure argon are provided for inputting pure oxygen used as calibration gas, oxygen balance nitrogen (oxygen containing a prescribed amount of nitrogen), and pure arg...

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Abstract

A nitrogen analyzer including nitrogen concentration measuring means for determining the concentration of impurity nitrogen in a mixed gas composed mainly of argon and oxygen on the basis of the emission intensity of light occurring from the impurity nitrogen as a result of electric discharge in a discharge tube and the concentration of oxygen in a sample gas introduced in the discharge tube; anddiluent oxygen introducing means for adding a diluent oxygen to the sample gas taken from the mixed gas in accordance with the oxygen concentration of the mixed gas.

Description

Technical field [0001] The present invention relates to a nitrogen analysis device, in particular to a nitrogen analysis device for measuring the concentration of impurity nitrogen contained in a mixed gas with argon and oxygen as the main components, and in particular to a nitrogen analysis device for measuring the concentration of the impurity A nitrogen analyzer that continuously measures the concentration of the impurity nitrogen contained in the feed argon of the argon tower and the crude argon output from the argon tower with air to produce argon. [0002] This application claims priority based on patent application No. 2006-041872 filed in Japan on February 20, 2006, and its content is hereby quoted. Background technique [0003] Proposed methods for measuring the concentration of impurity nitrogen contained in a mixed gas mainly composed of argon and oxygen include: inputting the mixed gas into a discharge tube below atmospheric pressure, which is unique to the nitrogen gen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/67G01N1/22
CPCG01N21/67
Inventor 马场直步
Owner NIPPON SANSO CORP
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