抄録
Acoustic transmission measurement techniques for large boiler furnaces were studied and developed. It was found in fundamental acoustic transmission tests that l0-12 kHZ acoustic waves were suitable for measuring combustion gas distribution in boiler furnaces. A few kinds of computer programs for CT (Computed Tomography) were written and discussed. The program based on the method of least squares was most convenient in cases where few data were available. Then, we performed the measurement of combustion gas temperature distributions in a test furnace. The data were reduced using the above CT program. The temperature distribution calculated by the CT program is very similar to and favorably agrees with the results measured by a suction pyrometer. The maximum temperature difference between the two methods is 5 percent in the 700∼1000 °C temperature range.
