CN-116235034-B - Exhaust gas analysis device, exhaust gas analysis method, and program storage medium for exhaust gas analysis device

Abstract

The invention provides an exhaust gas analysis device, an exhaust gas analysis method, and a program storage medium for an exhaust gas analysis device, wherein the exhaust gas analysis device (2) analyzes exhaust gas generated by fuel combustion, and comprises a first analyzer (21) for measuring the concentration of a component to be measured in the exhaust gas, a second analyzer (22) for measuring the concentration of CO 2 in the exhaust gas, a storage unit (233) for storing the hydrogen-carbon ratio which is the ratio of hydrogen to carbon constituting the fuel, or an input receiving unit (230) for receiving the input of the hydrogen-carbon ratio, a moisture concentration estimating unit (235) for estimating the moisture concentration in the exhaust gas based on the measured concentration of CO 2 and the hydrogen-carbon ratio of the fuel, and a correction unit (232) for correcting the concentration of the component to be measured based on the estimated moisture concentration.

Inventors

• ISHIZAKI TOMOHIKO
• YOSHIMURA TOMOSHI

Assignees

• 株式会社堀场制作所

Dates

Publication Date

20260505

Application Date

20210922

Priority Date

20201002

Claims (11)

1. 1. An exhaust gas analysis device is characterized in that, The exhaust gas analysis device analyzes exhaust gas generated by combustion of fuel, The exhaust gas analysis device is provided with: a first analyzer that measures a concentration of a measurement target component in the exhaust gas; A second analyzer that measures a concentration of CO 2 in the exhaust gas; A storage unit that stores a hydrogen-carbon ratio as a ratio of hydrogen to carbon constituting the fuel or an input receiving unit that receives an input of the hydrogen-carbon ratio; A moisture concentration estimating unit for estimating the moisture concentration in the exhaust gas from the measured concentration of CO 2 and the hydrogen-carbon ratio of the fuel, and And a correction unit configured to correct an influence of moisture on the measured concentration of the measurement target component based on the estimated moisture concentration and a sensitivity coefficient indicating a relationship between the moisture concentration and the sensitivity of the first analyzer.
2. 2. The exhaust gas analysis device according to claim 1, wherein, The first analyzer measures the concentration of the measurement target component by wet measurement, The second analyzer measures the CO 2 concentration by dry measurement.
3. 3. The exhaust gas analysis device according to claim 2, wherein, The moisture concentration estimating unit estimates the moisture concentration in the exhaust gas by multiplying the wet CO 2 concentration obtained by converting the dry measured CO 2 concentration into a wet measured value by the hydrogen-carbon ratio or by a calculation equivalent thereto.
4. 4. The exhaust gas analysis device according to claim 2 or 3, wherein, The exhaust gas analysis device further includes a CO 2 concentration conversion unit that converts the CO 2 concentration measured by the second analyzer by a dry method into a wet measurement value based on the hydrogen-carbon ratio, The correction unit corrects the concentration of the measurement target component using the water concentration estimated by the water concentration estimation unit and the CO 2 concentration converted by the CO 2 concentration conversion unit.
5. 5. The exhaust gas analysis device according to claim 4, wherein, The moisture concentration estimating unit estimates the moisture concentration in the exhaust gas from the measured CO 2 concentration, the hydrogen-carbon ratio of the fuel, the moisture concentration in the atmosphere, the partial pressure of the CO 2 component of the exhaust gas, and the partial pressure of the H 2 O component of the exhaust gas.
6. 6. The exhaust gas analysis device according to claim 5, wherein, The CO 2 concentration conversion unit converts the CO 2 concentration measured by the second analyzer by a dry method into a wet measurement value based on the hydrogen-carbon ratio of the fuel and the partial pressure of the CO 2 component of the exhaust gas.
7. 7. The exhaust gas analysis device according to claim 5, wherein, The exhaust gas analysis device further includes a calculation unit that calculates partial pressures of a CO 2 component and an H 2 O component of the exhaust gas based on at least the composition of the fuel and the formula of complete combustion of the fuel.
8. 8. The exhaust gas analysis device according to any one of claims 1 to 3, wherein, The measurement object component is NO x .
9. 9. The exhaust gas analysis device according to claim 8, wherein, The first analyzer is a CLD detector.
10. 10. An exhaust gas analysis method, characterized in that, The exhaust gas analysis method analyzes exhaust gas generated by combustion of fuel, Measuring a concentration of a measurement object component in the exhaust gas with a first analyzer, The concentration of CO 2 in the exhaust gas is measured using a second analyzer, Estimating the moisture concentration in the exhaust gas from the measured concentration of CO 2 and the hydrogen-carbon ratio as the ratio of hydrogen to carbon constituting the fuel, And correcting an influence of moisture on the measured concentration of the measurement target component based on the inferred moisture concentration and a sensitivity coefficient indicating a relationship between the moisture concentration and the sensitivity of the first analyzer.
11. 11. A program storage medium for an exhaust gas analysis device, characterized in that, The program storage medium for an exhaust gas analysis device stores a program for an exhaust gas analysis device, The exhaust gas analysis device analyzes exhaust gas generated by fuel combustion, and is provided with a first analyzer that measures the concentration of a measurement target component in the exhaust gas, and a second analyzer that measures the concentration of CO 2 in the exhaust gas, The exhaust gas analysis device program causes a computer to function as a storage unit, a moisture concentration estimation unit, and a correction unit, The storage portion stores a hydrogen-carbon ratio as a ratio of hydrogen to carbon constituting the fuel, The water concentration estimating unit estimates the water concentration in the exhaust gas from the measured concentration of CO 2 and the hydrogen-carbon ratio of the fuel, The correction unit corrects the influence of moisture on the measured concentration of the measurement target component based on the estimated moisture concentration and a sensitivity coefficient indicating a relationship between the moisture concentration and the sensitivity of the first analyzer.

Description

Exhaust gas analysis device, exhaust gas analysis method, and program storage medium for exhaust gas analysis device Technical Field The present invention relates to an exhaust gas analysis device, an exhaust gas analysis method, and a program storage medium for an exhaust gas analysis device, which analyze exhaust gas. Background Conventionally, for example, in order to analyze exhaust gas discharged from a vehicle or the like of an automobile, various gas analyzers have been used to measure the concentration of a measurement target component such as NO x. It is known that the exhaust gas contains moisture generated by, for example, combustion of fuel, and if the concentration of a measurement target component such as NO x in the exhaust gas is measured using a gas analyzer, a measurement error due to interference of the moisture is contained in the measured value. For this reason, conventionally, for example, the concentration of moisture in the exhaust gas is measured using a moisture concentration meter, and the concentration of the measurement target component in the exhaust gas is corrected based on the measured moisture concentration (for example, patent literature 1). However, this moisture concentration meter has a problem in that it is difficult to accurately generate a gas having a target moisture concentration, and therefore, calibration is difficult, because various types of moisture concentration gases need to be prepared at the time of calibration. In addition, there is a demand that a separate water concentration meter is not required from the viewpoint of space saving and cost reduction. Prior art literature Patent document 1 Japanese patent laid-open publication No. 2014-174054 Disclosure of Invention Technical problem to be solved by the invention The present invention has been made in view of the above-described problems, and a main object of the present invention is to provide an exhaust gas analysis device capable of correcting the influence of moisture on a component to be measured in exhaust gas without using a moisture concentration meter. Technical scheme for solving technical problems Specifically, the exhaust gas analysis device according to the present invention is characterized by comprising a first analyzer that measures the concentration of a component to be measured in the exhaust gas, a second analyzer that measures the concentration of CO 2 in the exhaust gas, a storage unit that stores a hydrogen-carbon ratio that is a ratio of hydrogen to carbon constituting the fuel or an input receiving unit that receives an input of the hydrogen-carbon ratio (i.e., at least one of the storage unit and the input receiving unit), a moisture concentration estimating unit that estimates the concentration of moisture in the exhaust gas from the measured concentration of CO 2 and the hydrogen-carbon ratio of the fuel, and a correcting unit that corrects the measured concentration of the component to be measured from the estimated concentration of moisture. In the case of such an exhaust gas analyzer, since the exhaust gas analyzer includes the moisture concentration estimating unit that theoretically estimates the moisture concentration in the exhaust gas using the CO 2 concentration in the exhaust gas and the hydrogen-carbon ratio of the fuel, the influence of moisture on the component to be measured can be corrected without directly measuring the moisture concentration using a moisture concentration meter. As an example of the exhaust gas analyzer that significantly attains the effects of the present invention, there is one in which the first analyzer measures the concentration of the measurement target component by wet measurement (wet measurement) and the second analyzer measures the concentration of the CO 2 by dry measurement (dry measurement). As a specific embodiment of the moisture concentration estimating unit, a method of estimating the moisture concentration in the exhaust gas by multiplying the wet CO 2 concentration obtained by converting the dry measured CO 2 concentration into a wet measured value by the hydrogen-carbon ratio or by a calculation equivalent thereto may be mentioned. As a specific embodiment of the exhaust gas analysis device, there may be mentioned a device further comprising a CO 2 concentration conversion unit that converts the CO 2 concentration measured by the second analyzer by a dry method into a wet measurement value based on the hydrogen-carbon ratio, wherein the correction unit corrects the concentration of the measurement target component using the moisture concentration estimated by the moisture concentration estimation unit and the CO 2 concentration converted by the CO 2 concentration conversion unit. In order to estimate the moisture concentration in the exhaust gas with higher accuracy, it is preferable that the moisture concentration estimating unit is configured to estimate the moisture concentration in the exhaust gas based on the measured C