Gas analysis device and gas analysis method

A gas analysis device comprising

• a first flow channel through which a sample gas flows,
• a first analyzer that is arranged in the first flow channel and that performs wet-measurement of a total hydrocarbon concentration in the sample gas,
• a second flow channel through which the sample gas flows,
• a non-methane/non-ethane cutter that is arranged in the second flow channel and that removes a hydrocarbon component other than methane and ethane in the sample gas,
• a second analyzer that is arranged downstream of the non-methane/non-ethane cutter in the second flow channel and that performs dry-measurement of a total concentration of methane and ethane in the sample gas, and
• a calculation section that calculates the concentration of the hydrocarbon component other than methane and ethane in the sample gas using the total hydrocarbon concentration obtained by the first analyzer and the total corrected concentration of methane and ethane, which is the moisture-corrected total concentration of methane and ethane, obtained by the second analyzer.

A gas analysis method comprising steps of

• arranging a first analyzer that performs wet-measurement of a total hydrocarbon concentration in a sample gas in a first flow channel through which the sample gas flows,
• arranging a hydrocarbon selective catalyst that removes a predetermined hydrocarbon component in the sample gas in a second flow channel through which the sample gas flows,
• arranging a second analyzer that performs dry-measurement of the concentration of the hydrocarbon component in the sample gas downstream of the hydrocarbon selective catalyst in the second flow channel, and
• calculating the concentration of the predetermined hydrocarbon component in the sample gas using the total hydrocarbon concentration obtained by the first analyzer and a corrected concentration of hydrocarbon component, which is a moisture-corrected concentration of the hydrocarbon component, obtained by the second analyzer.