| 摘要 |
PURPOSE:To eliminate the occurrence of the back flow of exhaust gases in any operating condition of a plurality of gas turbines by a method wherein exhaust gases are joined just after the outlets of exhaust heat recovery boilers and introduced into the lower part of a stack by a dual system duct with a partition plate in the inside and the streams of the exhaust gases are joined together at a pressure-free or negative pressure part near the lower part of the stack. CONSTITUTION:Combustion gas completing the work at a gas turbine 1 passes through an exhaust heat recovery boiler 3 and enters an exhaust duct 4. The duct 4 joins an exhaust gas duct 4 for another gas turbine in one body just after the outlets of the boilers 3 and they enter a dual system duct 5. The duct 5 inside of which is equipped with a partition plate at the center and partitioned into two parts on the right and left sides (or the upper and lower sides). Although a single duct, it is partitioned into two parts inside. Exhaust gas passing through each system joins at a joint part 7 near the lower part of a stack and a joined stream is introduced into a centralized stack 8 and exhausted from the tip into the open air. Thus, each exhaust gas joins at the part 7 as a pressure-free or negative pressure part and each exhaust gas system for the gas turbine has such a function just as if the system is operated as an independent exhaust gas system.
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