exhaust temperature of coal power plant at electrostatic precipitator(hot & cold side)?

Answer 1

Precipitators are designed to handle gas flow form 10,000 cfm to 300,000 cfm and can operate at temperatures as high as 750 degrees F.
Since the precipitators are heavily insulated, and based on a gas flow rate of 2 to 5 ft. per sec., the temperature drop of the gas from inlet to outlet would not amount to much.