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Device and method for diluting and sampling gas online and generating standard gas

A technology for generating devices and diluent gas, which is applied in measuring devices, standard gas analyzers, and analyzing gas mixtures. It can solve problems such as cumbersome operations, complicated connections, and waste of resources, and achieve high precision, stability, and high degree of intelligence. , a wide range of effects

Active Publication Date: 2018-11-27
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The gas source treatment equipment currently on the market generally only includes a single function, so in practical applications, users generally need to purchase multiple sets of equipment to combine to meet different processing requirements
Due to the difficulty in unifying the gas path design standards of various equipment and the complicated connection between different equipment, the response speed of the processing system is slow, the stability is poor and the operation is cumbersome, which brings great waste of resources and makes it difficult to achieve satisfactory results.

Method used

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  • Device and method for diluting and sampling gas online and generating standard gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Use the device of the invention to produce NO in the laboratory 2 Standard gas, the required concentration of nitrogen dioxide standard gas is 100ppbv and the flow rate is 2L / min.

[0071] Solution 1: The standard gas source adopts the standard nitrogen dioxide gas in a gas bottle with a concentration of 10ppmv, and uses the zero air generated on-line for dilution, and finally forms the nitrogen dioxide standard gas with the required concentration and flow rate.

[0072] Connect the air inlet to the outside air and the standard gas inlet to the 10ppmv nitrogen dioxide standard gas cylinder, turn on the vacuum pump, control the first gas path switch to connect to its first gas path, and control the second gas path switch to connect to its first Air circuit, control the third air circuit switch to communicate with the second air circuit, control the fourth air circuit switch and the fifth air circuit switch to communicate with the sub air circuit without the calibration gas onl...

Embodiment 2

[0082] The concentration of nitrogen dioxide at a certain gas emission point is as high as tens to hundreds of ppmv, and the detection range of the detection equipment is 0 to 10 ppmv. Therefore, the present invention is used to carry out online dilution sampling of on-site gas and then send it to the detection equipment for detection. The gas flow rate required by the detector is 1.5 L / min, and the dilution factor is 100 times. Due to the lack of cylinder gas as the carrier gas for dilution on site, zero air generated online is used as the dilution gas.

[0083] Connect the air inlet to the outside air and the sampling gas inlet to the collected gas sample, turn on the vacuum pump and sampling pump, control the first gas path switch to connect to its first gas path, and control the second gas path switch to connect to its second gas path , Control the third gas path switch to communicate with its second gas path, control the fourth gas path switch and the fifth gas path switch t...

Embodiment 3

[0085] A certain nitrogen dioxide detection equipment needs to be calibrated on site, and the calibration requires a nitrogen dioxide standard gas with a flow rate of 2L / min and a concentration of 100ppbv. Since there is no standard gas cylinder on site, the present invention is used to generate the required nitrogen dioxide standard gas online.

[0086] Connect the air inlet to the outside air, turn on the vacuum pump, control the first air path switch to communicate with its first air path, control the second air path switch to communicate with its second air path, and control the third air path switch to communicate with its first air Control the fourth gas path switcher and the fifth gas path switch to communicate with the sub gas path provided with the calibration gas online generation module, control the sixth gas path switch to communicate with its first gas path, and control the seventh gas path switch The device communicates with its second gas path, the flow rate of the...

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Abstract

The invention discloses a device and method for diluting and sampling gas online and generating standard gas. The device comprises a two-stage diluting unit, a diluting gas supplying unit, a diluted gas supplying unit and a gas outlet unit. According to the method, the online dynamic gas distribution of the standard gas, the online dilution and sampling of the gas and the online generation of thegas are carried out by virtue of the device. Compared with the prior art, the device and the method have the advantages that by controlling a gas flow path, the functions of zero-air generation, online dynamic gas dilution and distribution, gas collection and online dilution, dynamic generation of standard gases and the like can be realized; the device can be used as a portable multifunctional comprehensive gas pretreatment device, can meet different gas treatment requirements, has multiple functions, and is high in intelligent level, precision and stability, wide in application range and thelike.

Description

Technical field [0001] The invention relates to the technical field of gas detection pre-processing, and more specifically, to a gas online dilution sampling and calibration gas generation device. Background technique [0002] In the field of gas detection, it is often necessary to pre-process the gas, including online gas sampling, zero air generation, gas dilution, dynamic gas distribution, and calibration gas generation. [0003] The gas source treatment equipment currently appearing on the market generally only contains a single function, so in actual applications users generally need to purchase multiple sets of equipment to be combined to meet different treatment requirements. Since it is difficult to unify the gas path design standards of various devices, and the connection between different devices is complicated, the response speed of the processing system is slow, the stability is poor, and the operation is cumbersome, resulting in a great waste of resources and it is dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N1/38
CPCG01N1/38G01N33/0006G01N33/007G01N33/0072
Inventor 王竹青付大友袁东谭文渊陈雨晴李佳祁廖琴瑶
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING