Method and apparatus for removing selenium oxide in a sample, and method and apparatus for measuring mercury in coal combustion exhaust gas by using the same

An apparatus for removing selenium oxide in a sample, which comprises:

• an introduction path for heating the sample;
• a scrubber charged with one of a barium compound, an iron oxide, or a mixture of the barium compound and the iron oxide;
• and
• a heating means for keeping the scrubber at a predetermined temperature, in order to selectively remove selenium oxide.

A method of removing selenium oxide in a sample, comprising:

• heating the sample;
• providing a primary cooling treatment wherein the heated sample is cooled by mixing the sample with a cooling water;
• providing a secondary cooling treatment wherein the mixed sample is subjected to a gas/liquid separation and simultaneously further cooled to remove the selenium oxide from the sample;
• regenerating the cooling water recovered by the secondary cooling treatment to remove selenium oxide;
• and reutilizing the regenerated cooling water by cycling as cooling water to the primary cooling treatment.

A method of monitoring mercury in coal combustion exhaust gas comprising the steps of:

• providing a sample of coal combustion exhaust gas with mercury and SeO2;
• heating the sample to a temperature that retards condensation of SeO2 from the sample;
• mixing the heated sample with cooling water to dissolve the SeO2 in the water;
• separating a portion of the sample with mercury as a gas from the water with the dissolved SeO2;
• and
• measuring the portion of the sample with mercury with a mercury analyzer to determine the amount of mercury in the coal combustion exhaust gas.