Exhaust gas sampling apparatus

A technology of sampling device and exhaust flow, applied in the direction of sampling device, sampling, measuring device, etc., can solve the problems of complex calculation, control flow change, measurement error, etc.

Inactive Publication Date: 2014-12-17
HORIBA LTD
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Problems solved by technology

[0009] However, since the diluted exhaust gas immediately after passing through the heat exchanger has temperature spots, there is a problem that the control flow rate of the critical flow venturi tube changes, resulting in inaccurate proportional sampling
However, this method needs to be corrected for the delay time of the diluted exhaust gas, such as the flow time of the diluted exhaust gas from the sampling point to the critical flow venturi, and the calculation becomes complicated.
[0011] In addition, even in the case of total mass measurement using the integrated flow obtained by integrating the control flow of the critical flow Venturi, if the control flow of the critical flow Venturi changes, a measurement error occurs

Method used

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Embodiment Construction

[0053] Hereinafter, one embodiment of the exhaust gas sampling device of the present invention will be described with reference to the drawings.

[0054] The exhaust gas sampling device 100 of this embodiment is used, for example, in a gas analysis system for analyzing components contained in exhaust gas discharged from an engine, etc., and the exhaust gas is diluted several times with a dilution gas such as the atmosphere (air for dilution). (For example, 10 times to 20 times), and a device that performs concentration measurement in a dilution sampling manner.

[0055] Specifically, as figure 1 As shown, the exhaust gas sampling device 100 includes: a diluted exhaust gas channel R, through which the diluted exhaust gas obtained by diluting the exhaust gas with a dilution gas flows; a temperature adjustment mechanism 2, It is arranged on the diluted exhaust flow path R to adjust the temperature of the diluted exhaust gas; the flow control mechanism 3 (constant volume sampling...

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Abstract

The present invention is one that downsizes an exhaust gas sampling apparatus such as a CVS as well as uniforming temperature of diluted exhaust gas passing through a flow rate controller such as a critical flow venturi, and has a casing 10 formed with a gas introduction port PT3 for introducing the diluted exhaust gas and a gas lead-out port PT4 for leading out the diluted exhaust gas, in which a temperature regulating mechanism 2 is contained in the casing 10, the flow rate controller 31 is fluidly connected to the gas lead-out port PT4, and between the gas introduction port PT3 and the temperature regulating mechanism 2, a dispersion structure 12 that disperses the diluted exhaust gas introduced from the gas introduction port PT3 is provided.

Description

technical field [0001] The invention relates to an exhaust gas sampling device such as a constant volume sampling device. Background technique [0002] Conventionally, constant-volume sampling devices have been widely used as a dilution sampling method in which the collected exhaust gas is diluted with a dilution gas such as the atmosphere and the concentration of components contained in the diluted exhaust gas (hereinafter referred to as diluted exhaust gas) is measured. (hereinafter referred to as CVS). [0003] As shown in Patent Document 1, the CVS is provided with a heat exchanger on the upstream side of a flow control mechanism composed of a critical flow venturi tube and a suction pump for adjusting the temperature of diluted exhaust gas to be constant. The diluted exhaust gas that has passed through the heat exchanger flows into the critical flow venturi tube after passing through the connecting pipe. At this time, immediately after the diluted exhaust gas passes t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/22G01N1/38
CPCG01N2001/2282G01N1/2252G01N2001/2264G01N1/2247F15D1/0005G01N15/06F15D1/001
Inventor 熊谷树江草隆志
Owner HORIBA LTD
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