Gas measurement apparatus

A gas measurement apparatus that measures a gas component to be analyzed in sample gas, the gas measurement apparatus comprising:

• a sample gas supply line that supplies the sample gas;
• a sample gas line that has a first dehumidifier that dehumidifies the sample gas;
• a reference gas line that has a gas component remover that removes the gas component to be analyzed from the sample gas supplied from the sample gas supply line and a second dehumidifier that dehumidifies the sample gas after the gas component to be analyzed is removed by the gas component remover to generate reference gas;
• a sample cell into which gas that has passed through the sample gas line is introduced;
• a reference cell into which gas that has passed through the reference gas line is introduced;
• a light source that irradiates the sample cell and the reference cell with light;
• and
• a detection unit that detects intensity of light that has passed through the sample cell after being emitted from the light source to the sample cell and intensity of light that has passed through the reference cell after being emitted from the light source to the reference cell,
• wherein the gas component to be analyzed includes SO2 gas,
• wherein the gas component remover is a bubbling separator that bubbles the sample gas with water to remove SO2 gas from the sample gas, and
• wherein the second dehumidifier is a dehumidification apparatus that dehumidifies gas that has passed through the bubbling separator, and
• wherein the bubbling separator uses as the water to be used for bubbling, drainage water produced when the sample gas is cooled.