| 摘要 |
<p>There is provided a structure including: a first exhaust gas flow path (2, 3, 4) provided to each of steel making electric arc furnaces (1) to discharge exhaust gas thereinto; a waste heat boiler (6) disposed on the first exhaust gas flow path and configured to recover waste heat as saturated steam from exhaust gas; a steam accumulator (62) configured to store steam formed by confluence of saturated steam parts, each generated by the waste heat boiler (6); a steam super heater (43) configured to turn steam, which has been stored in the steam accumulator (62), into superheated steam by heating; a second exhaust gas flow path (5, 41, 42) configured to lead exhaust gas, which has been treated with waste heat recovery in the waste heat boiler (6), to the steam super heater (43) to use it for superheating saturated steam and to then discharge it; a third exhaust gas flow path (18, 12, 51) configured to discharge exhaust gas, which has been treated with waste heat recovery in the waste heat boiler (6), not through the steam super heater (43); and a switching (31, 32) device configured to switch flow paths for exhaust gas, which has been treated with waste heat recovery, between the second exhaust gas flow path and the third exhaust gas flow path.</p> |
