PURPOSE: To control the concn. of nitrate ions in an absorbing soln. and to prevent pitting corrosion by catalytically reducing stack gas contg. SOX and NOX with NH3 to carry out denitration, oxidizing part of the residual NOX to NO2 and desulfurizing the stack gas contg. SOX, NO and NO2.
CONSTITUTION: NH3 is added to stack gas contg. SOX and NOX (≥95% of the NOX is NO) and most of the NOX is removed by catalytic reduction. Part of NO in the residual MOX is catalytically oxidized to NO2 with O3, etc. The concn. of NO2 is so regulated as to keep the concn. of nitrate ions in an absorbing soln. in a desulfurizer at ≥700ppmW and the molar ratio of nitrate ions to chlorine ions at ≥0.85. The stack gas contg. SOX, NO and NO2 is then sent to the desulfurizer and desulfurized with the absorbing soln. Thus, the concn. of nitrate ions in the absorbing soln. is controlled and pitting corrosion by chlorine ions is prevented.
KOMATSUBARA YOSHIAKI
MORIMOTO TATSUO
| JPS5376970A | 1978-07-07 | |||
| JPS5027763A | 1975-03-22 | |||
| JPS5249974A | 1977-04-21 | |||
| JPS52125469A | 1977-10-21 |
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