Exhaust Gas Analysis Using CO2-Based Moisture Correction
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Solution Overview
Problem
Existing exhaust gas analysis systems face challenges in accurately correcting measurement errors caused by moisture without the need for a separate moisture concentration meter, which is difficult to calibrate and adds cost and space requirements.
Innovation Solution
An exhaust gas analysis device that estimates moisture concentration using a CO2 analyzer and the hydrogen/carbon ratio of the fuel, allowing for correction of measured component concentrations without a moisture concentration meter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a moisture concentration meter is used to measure moisture in exhaust gas, then measurement precision of component concentration is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the moisture measurement function from a separate moisture concentration meter and integrates it into the existing CO2 analyzer. By using the CO2 analyzer to measure both CO2 concentration and moisture concentration (through theoretical calculation based on CO2 data and fuel hydrogen/carbon ratio), the system eliminates the need for a dedicated moisture measurement device, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The CO2 analyzer is given multiple functions: it not only measures CO2 concentration but also theoretically calculates moisture concentration based on the CO2 measurement data and the fuel's hydrogen/carbon ratio. This multi-functionality allows a single device to perform what previously required separate instruments, reducing overall system complexity.
2Measurement precision
If a moisture concentration meter is used to correct measurement errors, then measurement precision is improved, but system cost increases
Solution Approach 1:
The CO2 analyzer is designed to perform dual functions: measuring CO2 concentration and calculating moisture concentration. This eliminates the need to purchase and install a separate moisture concentration meter, thereby reducing system cost while maintaining the ability to correct measurement errors caused by moisture interference.
Solution Approach 2:
The system uses its own CO2 measurement capability to derive moisture concentration information through theoretical calculation. By leveraging existing measurement data and the known fuel hydrogen/carbon ratio, the system serves its own moisture measurement needs without requiring external specialized equipment, thus reducing overall system cost.
3Measurement precision
If a moisture concentration meter is used to measure moisture, then measurement precision is improved, but space requirements increase
Solution Approach 1:
The patent extracts the moisture measurement capability from a separate physical instrument and integrates it into the existing CO2 analyzer system. By performing moisture concentration calculation through theoretical methods using CO2 measurement data, the system eliminates the need for additional measurement space that would be required for a separate moisture concentration meter.
4Measurement precision
If calibration is performed using a moisture concentration meter, then measurement precision is improved, but ease of operation deteriorates due to difficulty in preparing calibration gases
Solution Approach 1:
The patent removes the calibration complexity associated with moisture concentration meters by eliminating the need for separate moisture measurement. Since moisture concentration is theoretically calculated from CO2 measurements and fuel properties rather than directly measured, the system inherits the simpler calibration procedure of the CO2 analyzer, significantly improving ease of operation.
Data Source
AI summary
An exhaust gas analysis device analyzes exhaust gas generated when fuel is combusted. This exhaust gas analysis device includes a first analyzer that measures a concentration of a component to be measured in the exhaust gas, a second analyzer that measures a concentration of CO2 in the exhaust gas, a storage portion that stores a hydrogen/carbon ratio, which is a ratio between hydrogen and carbon composing the fuel, or an input receiving portion that receives an input of the hydrogen/carbon ratio, a moisture concentration estimating portion that, based on the measured CO2 concentration and on the hydrogen/carbon ratio of the fuel, estimates a concentration of moisture in the exhaust gas, and a correcting portion that, based on the estimated moisture concentration, corrects the measured concentration of the component to be measured.