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2 A chemical cleaning liquid waste processing system for processing the chemical cleaning liquid waste caused by chemical cleaning process for the internal of steam generator secondary side in the nuclear power plant and thereof control method
2 A chemical cleaning liquid waste processing system for processing the chemical cleaning liquid waste caused by chemical cleaning process for the internal of steam generator secondary side in the nuclear power plant and thereof control method
The present invention relates to a chemical cleaning waste liquid treatment system for treating a chemical cleaning waste liquid generated in a chemical cleaning process inside a steam generator secondary side of a nuclear power plant and a control method thereof, (Steam and exhaust gas) produced by primary combustion of the chemical cleaning waste liquid generated by the process by the thermal decomposition furnace into the oxidation furnace and oxidizing it by secondary combustion in the oxidation furnace, To prevent damage to the inner wall and the bulkhead due to oxidation due to the high temperature and to return the exhaust gas when the toxic substances contained in the exhaust gas discharged to the outside through the oxidizing furnace are above the reference value, And the constitution is branched from the exhaust line, and the connection between the pyrolysis furnace and the oxidation furnace An exhaust gas return line connected to the pipe and returning the exhaust gas to the oxidation furnace when the exhaust gas exhausted along the exhaust line contains more harmful substances than the reference value; A first electromagnetic valve mounted on the exhaust gas return line to open and close the exhaust gas return line; A toxic substance detection means mounted on the exhaust line for detecting a harmful substance content of the exhaust gas exhausted along the exhaust line and transmitting the detection value signal; A second electromagnetic valve mounted on an outer end of the exhaust line to open and close the exhaust line; A third electromagnetic valve mounted on a waste solution supply line between the pyrolysis furnace and the chemical cleaning waste solution storage tank to open and close a waste solution supply line; A blower mounted on the exhaust gas return line for blowing the exhaust gas to the oxidation furnace; And controls the operation of the first to third electromagnetic valves and the blower in accordance with the detection value signals received from the first, second and third electromagnetic valves, the harmful substance detecting means and the blower, respectively, And a control unit.
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