tailieunhanh - Advanced Turbine Systems phần 2

khoa học vật liệu, và nhiệt động lực học tương đương với việc phá vỡ những dặm 4 phút. Ngày nay, mục tiêu đã không chỉ được đáp ứng, nhưng cơ sở kiến thức đã tích lũy được cho phép thậm chí nâng cao hiệu suất hơn nữa. Thành công chắc chắn thiết lập Hoa Kỳ là nhà lãnh đạo thế giới trong công nghệ tuabin khí và cung cấp cho khoa học cơ bản để duy trì vị trí đó. | Completing ATS Development Development activities are focused on extending the W501G performance to ATS efficiencies by introducing additional technology advancements and increasing the firing temperature to 2 750 oF. Closed-Loop Steam Cooling The next major step will be incorporation of closed-loop steam cooling into the W501G stage 1 turbine vane. This addition will extend the benefits of the existing steam cooled transition by eliminating cooling air at the turbine inlet raising the firing temperature and freeing more compressor air to reduce NOx emissions. Prior to retrofitting into the W501G the ATS steam cooled vane underwent evaluation in a test rig incorporating a single full-scale combustor and transition capable of achieving ATS temperatures and pressures. The tests were conducted at the Arnold Air Force Base-Arnold Engineering Development Center in Tennessee. Instrumentation verified analytical predictions of metal temperatures heat transfer coefficients and stress. SWPC released the stage 1 turbine vane for manufacture and subsequent installation in the W501G with testing scheduled for 2001. Plans for the W501ATS are to incorporate closed-loop steam cooling into both stage 1 and stage 2 vanes and ring segments. Catalytic Combustion To achieve NOx emission targets across a wide range of ATS operating conditions SWPC is developing a catalytic combustor in conjunction with Precision Combustion Inc. PCI under DOE s Small Business Innovation Research Program. Catalytic combustion serves to stabilize flame formation by enhancing oxidation under lean firing conditions. The SWPC PCI piloted-ring combustor will replace the standard diffusion flame pilot burner with a catalytic pilot burner. Initial atmospheric pressure combustion testing determined turndown and emission characteristics. Follow-on tests successfully demonstrated catalytic combustion at full-scale under ATS combustion temperatures and pressures. Engine testing is planned for early 2001. Catalytic