Exhaust gas analyzer and probe unit

Abstract

The invention relates to an exhaust gas analyzer and a probe unit. The probe unit has a simple and an easily-assembled structure and reliably guides the correction gas into a whole gas guide hole. The probe unit includes a gas sensor having multiple gas introduction bores for introducing a gas into an inside of the gas sensor, and a sensor holder inside of which the gas sensor is held and that is arranged inside of a duct so as to introduce an exhaust gas flowing in the duct into the gas sensor. A calibration gas flow channel is arranged in the sensor holder and has an opening at an inner surface of a side wall, surrounding the gas introduction bores of the gas sensor, of the sensor holder so as to supply a calibration gas to the gas sensor. A guide groove is arranged continuous to the opening of the calibration gas flow channel and arranged on the inner surface of the side wall along an arranging direction of the multiple gas introduction bores to face the multiple gas introduction bores.

Description

technical field [0001] The present invention relates to an exhaust gas analysis device installed on exhaust pipes of combustion devices such as engines, boilers, waste combustion furnaces, industrial furnaces, etc., for which exhaust Analyze the specified components contained in the exhaust gas flowing through the flue in the pipe. Background technique [0002] Conventionally, as an exhaust gas analysis device for detecting and analyzing predetermined components such as oxygen and nitrogen oxides contained in the exhaust gas in the flue, as shown in Patent Document 1 and Patent Document 2, there are devices as follows: Installed directly into the flue, the exhaust gas is sampled by this detection unit, and specified components such as oxygen or nitrogen oxides in the exhaust gas are detected. [0003] This detection unit specifically includes: a gas sensor, which has a plurality of gas introduction holes for introducing gas into the interior; The exhaust gas flowing in the...

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Problems solved by technology

[0004] However, since the calibration gas is supplied through one calibration gas channel to a plurality of gas introduction holes, there is a problem that the calibration gas cannot be sufficiently supplied into the gas sensor through the gas introduction holes.

In particular, since the detection unit is installed protruding into the flue, when the pressure in the flue is negative, the calibration gas may be sucked into the flue before it flows into the gas introduction hole, etc., due to the pressure in the flue. The problem that the calibration gas cannot be supplied sufficiently to the gas sensor

In such a situation, there is a problem that the consumption of the calibration gas increases in order to supply the calibration gas to the inside of the gas sensor sufficiently.

[0005] Moreover, in the assembly stage, although it is considered that the opening of the calibration gas flow path is opposed to one of the gas introduction holes, or the calibration gas flow path is branched and the opening of each branch flow path is opposed to the gas introduction hole, it is possible to The calibration gas is fully supplied from the gas inlet hole to the inside of the gas sensor, but due to the accuracy of assembly, it is difficult to make the opening of the calibration gas flow path face the gas inlet hole

In addition, in the structure where the calibration gas flow path is branched, the structure of the sensor holder will be complicated and enlarged, so it is not practical.

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