| 摘要 |
PURPOSE:To enable continued measurement by allowing exhaust gas to pass through a hydrogen fluoride filled converter and detecting a concentration of sulphur fluoride in exhaust gas by decrement of measurements of hydrogen fluoride in entrance and exit of the converter. CONSTITUTION:Exhaust gas 1 containing SO3 and sodium fluoride is introduced to a sampling pipe as sampling gas 2 and then, a portion of the gas is introduced to a converter 3 containing sodium fluoride and other portion to an analyzer 10 of hydrogen fluoride via the sampling tube 9. In the analyzer 10 a concentration of hydrogen fluoride of the gas 1 is measured. The gas introduced into the converter 3 generates hydrogen fluoride of doubled equivalent weight to SO3 according to the chemical equation here. Temperature of the converter is kept in a range 300-400 deg.C suited to the reaction by a converter heater 4. Gas from the converter is introduced to a hydrogen fluoride analyzer 6 through a conduit pipe 5 and exhausted into the air as hydrogen fluoride analyzer discharge gas 7. 1/2 of the difference of analysis measurements of hydrogen fluoride analyzer 10 and that of 6 is defined as the concentration of SO3. |
