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A device and method for gas online dilution sampling and calibration gas generation

A technology for generating device and diluting gas, which is used in measuring devices, standard gas analyzers, and gas mixture analysis. It can solve the problems of cumbersome operation, complicated connection, waste of resources, etc., and achieve high precision, stability, and high degree of intelligence. , a wide range of effects

Active Publication Date: 2021-02-26
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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  • A device and method for gas online dilution sampling and calibration gas generation

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Effect test

Embodiment 1

[0070] Utilize the device of the present 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] Scheme 1: The standard gas source uses a standard nitrogen dioxide gas with a concentration of 10ppmv in a gas bottle, and uses the zero air generated online for dilution to finally form a nitrogen dioxide standard gas with the required concentration and flow rate.

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

Embodiment 2

[0082] The concentration of nitrogen dioxide at a certain gas discharge 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 on-line dilution sampling of the 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 gas cylinders on site as the carrier gas for dilution, the zero air generated online is used as the dilution gas.

[0083] Connect the air inlet to the outside air and connect the sampling gas inlet to the collected gas sample, turn on the vacuum pump and sampling pump, control the first gas circuit switcher to connect to its first gas circuit, and control the second gas circuit switcher to connect to its second gas circuit , control the third gas path switcher to connect with its second gas path, control the fourth gas path sw...

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 gas path switcher to connect to its first gas path, control the second gas path switcher to connect to its second gas path, and control the third gas path switcher to connect to its first gas path. Control the fourth gas circuit switcher and the fifth gas circuit switcher to connect with the sub-gas circuit equipped with the calibration gas online generation module, control the sixth gas circuit switcher to connect to the first gas circuit, and control the switching of the seventh gas circuit The device is connected to its second air path, the...

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Abstract

The invention discloses a gas online dilution sampling and calibration gas generation device and method. The device includes a two-stage dilution unit, a dilution gas supply unit, a diluted gas supply unit and a gas outlet unit. The method uses the above device for calibration. Gas online dynamic gas distribution, gas online dilution sampling and gas online generation. Compared with the existing technology, the device and method for online gas dilution sampling and standard gas generation provided by the present invention can achieve zero air generation, dynamic online gas dilution and gas distribution, gas sampling and online dilution, and standard gas generation by controlling the gas flow path. With functions such as dynamic gas generation, it can be used as a portable multi-kinetic energy comprehensive gas pretreatment device to meet different gas treatment needs. It has the advantages of diverse functions, high intelligence, high precision and stability, and wide application.

Description

technical field [0001] The invention relates to the technical field of gas detection pretreatment, and more specifically, to a gas online dilution sampling and calibration gas generating device. Background technique [0002] In the field of gas detection, pretreatment of gas is often required, including gas online sampling, zero air generation, gas dilution, dynamic gas distribution, calibration gas generation, etc. [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 for connection to meet different processing requirements. Due to the difficulty in unifying the gas circuit design standards of each device and the complicated connection between different devices, 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 is difficult to achi...

Claims

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Application Information

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Patent Type & Authority Patents(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