Abstract:
PROBLEM TO BE SOLVED: To provide a smooth transition of flow limiting contours from a swirl generator into a mixing zone.SOLUTION: There is provided a premix burner for operating a heat generator, the burner at least having the swirl generator, a mixing section disposed downstream of the swirl generator and a transition piece for transferring the swirl flow from the swirl generator into the mixing section. The transition piece comprises an inlet connected to the swirl generator, an outlet connected to a mixing tube, and a continuing flow limiting interior contour between the inlet and the outlet. A least in an inlet section, the interior contour is curved radially inwards towards the inner diameter of the mixing tube, and at the outlet, the interior contour is flush with an interior flow limiting contour of the mixing tube.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of improving mixing of dilution air and hot combustion products of a first stage combustor by injecting dilution air with a swirl.SOLUTION: The hot gases of the first combustor are admitted to at least one intermediate turbine or directly or indirectly to at least one second combustor. The hot gases of the second combustor are admitted to a further turbine or directly or indirectly to an energy recovery. At least one combustor is operated under a caloric combustion path having a cylindrical architecture. At least one dilution air injection is introduced into the first combustor. A swirl flow caused by the dilution air injection is directed against or in the direction of the original swirl flow inside of the first combustor.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for mixing a dilution air with a hot main flow in a sequential combustion system of a gas turbine (100).SOLUTION: The gas turbine essentially comprises: at least one compressor; and a first combustor which is connected downstream from the compressor. The hot gases of the first combustor are supplied to at least one intermediate turbine or directly or indirectly to at least one second combustor. The hot gases of the second combustor are supplied to a further turbine or directly or indirectly to an energy recovery. First combustor liner (104) cooling air is injected coaxially with second combustor liner (105) cooling air, accompanied with a sufficient excess pressure margin with respect to the second combustor liner cooling air.
Abstract:
PROBLEM TO BE SOLVED: To provide a surging control method for a gas turbine capable of operating a gas turbine at improved efficiency while actively preventing surging of a compressor.SOLUTION: A gas turbine engine surging controlling method includes steps of: providing a gas turbine engine 10 including a compressor 20, a combustor 30 positioned on a downstream side of the compressor 20 and having a high temperature gas passage, and a turbine 40 positioned on a downstream side of the combustor 30 and having a high temperature gas passage; monitoring the gas turbine engine 10 relating to potential surging conditions; controlling a blow-off flow from the compressor 20 for the control purpose of avoiding the surging conditions based on the monitoring; and directing the blow-off flow to at least one of the plural high pressure gas passages, and bypassing at least a part of the combustor.
Abstract:
PROBLEM TO BE SOLVED: To provide an axial swirler for a gas turbine burner, which allows creation of an optimal exit flow velocity profile for increased combustion stability.SOLUTION: In order to achieve a controlled distribution of an exit flow velocity profile and/or a fuel equivalence ratio in the radial direction, a trailing edge 22, 35 is discontinuous with the trailing edge 22, 35 having a discontinuity 27 at a predetermined radius (R); at an inner radius (R), an exit flow angle (α), i.e. the angle between the tangent to the camber line of a vane 19, 19b, 33a, 33b and a swirler axis, is between 0° and 30°; and the exit flow angle (α) from the inner radius (R) is increasing to a value of between 30° and 60° at the predetermined radius (R), and the angle (α) from this predetermined radius (R) is decreasing to a value of between 10° and 40° at an outer radius (R).
Abstract:
PROBLEM TO BE SOLVED: To provide a combustor array that combines wide-range axial variance of a burner with a minimum influence of a leakage air flow on an oxidation process by flames.SOLUTION: There is provided a combustor array 30 especially for gas turbine that includes a combustion chamber 22 having a front panel 23 and a multi-cone type pre-mixing burner 21, the pre-mixing burner 21 being coupled to the front panel 23 through thin and long mixing zones 24, 26 by sealed slide joints 24, 26, and 32 in an axially movable configuration. The sealed slide joints 24, 26, and 32 are arranged upstream from the mixing zones 24, 26.
Abstract:
PROBLEM TO BE SOLVED: To enable operation with reduced CO emissions.SOLUTION: A gas turbine combustion system includes a gas turbine. The gas turbine includes: at least one compressor; at least one combustion chamber for generating working gas, which is connected to receive compressed air from the compressor; and at least one turbine connected to receive working gas from the combustion chamber. The combustion chamber consists of a single can-combustor or comprises a plurality of individual or interdependent can-combustors arranged in an annular can-architecture. The can-combustor has at least one premixed burner. The ignition of a mixture starts at the premixed burner outlet and the flame is stabilized in the region of the premixed burner outlet by means of a backflow zone. The can-combustor comprises a plurality of premixed burners arranged uniformly or is divided in at least two groups within the can-combustor.
Abstract:
PROBLEM TO BE SOLVED: To provide a diffuser which combines a smooth inner surface with safe compensation of different thermal expansions during transient conditions of a gas turbine.SOLUTION: Each of liner segments 29, 30 is fixed in the lateral direction at one fixing point 35. Each of liner segments 29, 30 is supported at a plurality of distributed points outside the fixing point 35 by means of supporting elements 26a, 26b, 31a, 31b, which are confined to a space between a conical liner 15, 15a, 15b and the support structure 17, 17a, 17b and allow a lateral thermal expansion of the liner segments 29, 30.
Abstract:
PROBLEM TO BE SOLVED: To further optimize existing diffuser designs and thus increase efficiency of turbo-machines, particularly low pressure modules or turbines of a steam driven power plant.SOLUTION: A diffuser 12 has an outer wall 121 extending to a diffuser lip 124 forming a diffuser outlet 123, and is continued to last stages 101, 111 of a turbine. The outer wall 121 has several subsequent straight wall parts at an angle to each other followed by a curved wall part. The curved section is arranged between a straight portion 3 and the diffuser lip 124, and has a perpendicular cross section forming a secondary curve 21.
Abstract:
PROBLEM TO BE SOLVED: To provide a plant configured to minimize an amount of wet steam supplied to downstream steam turbines while minimizing reheat equipment requirements.SOLUTION: A steam Rankine cycle plant 10 includes: a higher-pressure steam turbine 20 having an outlet 22 for exhausting exhaust steam; a reheater 35 fluidly connected to the higher-pressure steam turbine 20; a lower-pressure steam turbine 25 having an inlet 27 fluidly connected to the reheater 35; and a bypass fluidly connected to the outlet 22 and the inlet 27 to bypass the reheater. The higher-pressure steam turbine 20 has an intermediate stage. The reheater 35 is fluidly connected to the intermediate stage, allows extraction steam to be extracted from the intermediate stage, and directs the extraction steam to the reheater 35.