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Exhaust gas sampling apparatus

A sampling device and gas technology, which can be used in sampling devices, sampling, measuring devices, etc., can solve the problems of large-scale devices, increased costs, and difficult background correction.

Active Publication Date: 2014-09-10
HORIBA LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is the following problem: within the sampling time, the amount of diluted exhaust gas collected by the diluted exhaust gas sampling bag is different from the amount of dilution gas collected by the dilution gas sampling bag, making it difficult to accurately perform background correction
[0006] In addition, although it is conceivable to install a plurality of needle valves having the same control flow rate as the respective dilution exhaust flow rates for each of the plurality of dilution exhaust flow rates obtained by combining a plurality of sampling venturi tubes, this would lead to a large-scale problem of increased cost

Method used

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Embodiment Construction

[0033] The exhaust gas sampling device of the present invention will be described below with reference to the accompanying drawings.

[0034] 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, for example, by diluting it with the atmosphere (air for dilution) or the like. A dilution sampling method in which the exhaust gas is diluted several times (for example, 10 to 20 times) with gas and the concentration is measured.

[0035] Specifically, as figure 1 As shown, the exhaust gas sampling device 100 is a constant volume sampling device, and the exhaust gas sampling device 100 includes: a main channel ML, one end of which is connected to an exhaust gas inlet PT1, and the exhaust gas inlet PT1 is used to introduce exhaust gas and a dilution gas channel DL, one end of which is connected to the dilution gas introduction port PT2 for introducing a dilutio...

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Abstract

The present invention is one that, in the case where a sampling part is configured to include a plurality of venturis, with suppressing an increase in size of an apparatus and an increase in cost, accurately obtains a diluent gas flow rate in accordance with a diluted exhaust gas flow rate obtained on the basis of a combination among the plurality of venturis, in which the sampling part (8) collecting part of diluted exhaust gas is configured to parallel connect the plurality of venturis that control the flow rate of the diluted exhaust gas, and a flow rate control part (9) provided in a diluent gas sampling flow path (SL2) is configured to parallel connect a plurality of venturis that control the flow rate of diluent gas to be introduced into a diluent gas analyzing device.

Description

technical field [0001] The present invention relates to an exhaust gas sampling device for diluting, for example, exhaust gas discharged from an engine with a diluting gas such as the atmosphere, and sampling the diluted exhaust gas. Background technique [0002] As shown in Patent Document 1, as such an exhaust gas sampling device, a dilution gas channel for introducing a dilution gas is connected to the main channel through which the exhaust gas introduced from the exhaust gas inlet flows, and at the connecting point A portion of the diluted exhaust gas is sampled downstream of the diluted exhaust gas, and the portion of the diluted exhaust gas is collected into a diluted exhaust gas sampling bag. In addition, in order to perform background correction (background correction) of the component concentration of the diluted exhaust gas collected in the diluted exhaust gas sampling bag, the exhaust gas sampling device measures a portion of the dilution gas from the dilution gas...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N1/38
CPCG01N1/2252G01N1/2247G01N2001/2255
Inventor 熊谷树
Owner HORIBA LTD
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