Composition analysis apparatus and composition analysis method

A composition analysis method for analyzing a composition of a gas to be analyzed, the composition analysis method comprising:

• a step of measuring concentrations of a plurality of gases to be actually measured that are included in the gas to be analyzed;
• a step of calculating converted calorific values, the step measuring a refractive index of the gas to be analyzed and a speed of a sound propagating through the gas to be analyzed and then calculating a converted calorific value of the gas to be analyzed for each of the refractive index and the sound speed;
• a step of calculating a base miscellaneous gas total error calorific value, the step calculating, on a basis of the converted calorific values of the gas to be analyzed, a base error calorific value of an error calorific value attributable to miscellaneous gases included in the gas to be analyzed;
• and
• a step of calculating a concentration of a first gas not to be actually measured, the step calculating the concentration of the first gas on a basis of the respective concentrations of the gases to be actually measured and the base error calorific value.

A composition analysis method for analyzing a composition of a gas to be analyzed, the composition analysis method comprising:

• a step of obtaining concentrations of a plurality of gases to be actually measured that are included in the gas to be analyzed;
• a step of obtaining a refractive index of the gas to be analyzed and a speed of a sound propagating through the gas to be analyzed and then calculating a converted calorific value of the gas to be analyzed for each of the refractive index and the sound speed;
• a step of calculating, on a basis of the converted calorific value of the gas to be analyzed, a base error calorific value of an error calorific value attributable to miscellaneous gases included in the gas to be analyzed;
• and
• a step of calculating a concentration of a first gas on a basis of the respective concentrations of the gases to be actually measured and the base error calorific value.

A composition analysis apparatus for analyzing a composition of a gas to be analyzed, the composition analysis apparatus comprising:

• a part that calculates converted calorific values, the part being configured to obtain a refractive index of the gas to be analyzed and a speed of a sound propagating through the gas to be analyzed and calculate a converted calorific value of the gas to be analyzed for each of the refractive index and the sound speed;
• a part that calculates a base miscellaneous gas total error calorific value, the part being configured to calculate, on a basis of the converted calorific value of the gas to be analyzed, a base error calorific value of an error calorific value attributable to miscellaneous gases included in the gas to be analyzed;
• and
• a part that calculates a concentration of a first gas not to be actually measured, the part being configured to calculate the concentration of the first gas on a basis of concentrations of a plurality of gases to be actually measured that are included in the gas to be analyzed and the base error calorific value.