| 摘要 |
PROBLEM TO BE SOLVED: To provide a low NOx combustor for a gas turbine to facilitate optimization by a method wherein during the occurrence of thermal deformation and deterioration due to a long use or switching to a different kind of fuel, for example, kerosene and A-heavy oil, sir distribution of the combustor is regulated without overhaul. SOLUTION: This combustor comprises a hollow cylindrical inner cylinder 2 (a liner) having a through-hole 2a formed in an outer peripheral part, and a lean hole variable ring 2 to close the through-hole 2a and surround the inner cylinder. The lean hole variable ring 22 has an opening partially overlapped with the through-hole 2b of the inner cylinder 2, a lean hole 25 extending through the inner cylinder 2 and the lean hole variable ring 22 is formed, and the opening area of the lean whole 25 is formed through a peripheral movement along the inner cylinder of the lean hole variable ring 22. Further, this combustion comprises an actuator 24 to peripherally move the lean hole variable ring 22 along the inner cylinder 2. an NOx detector 26 to detect an NOx in exhaust gas, and a controller 28 to control the actuator 24 such that an NOx by the NOx detector 26 is minimized. By controlling the actuator 24 such the an NOx amount is minimized, an equivalence ratioϕis optimized.
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