Method for starting a continuous steam generator and continuous steam generator for carrying out said method
First Claim
1. A method for starting a power plant of the type having a gas turbine, a steam turbine and a continuous-flow steam generator, comprising:
- positioning the steam turbine downstream of the gas turbine and applying heat exhausted from the gas turbine as a heating gas in the steam generator by;
(i) providing an evaporator continuous-flow heating surface that is arranged in a heating gas duct through which the flow is capable of flowing in an approximately horizontal heating gas direction, and which comprises a number of steam generator tubes connected in parallel to allow a flow medium to flow through; and
(ii) providing a superheater heating surface that is connected downstream of the evaporator continuous-flow heating surface on the flow medium side and which comprises a number of superheater tubes connected in parallel to allow the evaporated flow medium to flow through, and(iii) positioning the evaporation end point of the flow medium in the superheater tubes to temporarily limit the temperature of the flow medium at an exit of the superheater heating surface while starting up the steam turbine.
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Accused Products
Abstract
The invention relates to a continuous steam generator provided with an evaporator through flow heating surface which is disposed in a heating gas channel which can be cross flown in an approximately vertical manner in a heating gas device, said evaporator through flow heating surface comprising a plurality of parallel connected steam generating pipes enabling a flow medium to flow through, and an overheating heating surface which is arranged downstream from the evaporator through flow heating surface comprising a plurality of parallel connected overheating pipes enabling the evaporated flow medium to flow through, also enabling production and operational costs to be reduced and enabling the temperature of the steam on the outlet of the overheating heating surface to be controlled in a comparatively simple and flexible manner. The steam end-point of the flow medium is displaced to the overheating pipe, if required. The continuous heating surfaces and the overheating heating surfaces are combined to form one functional unit such that the overheating heating surface can be used as a steam heating surface in a continuous steam generator which is particularly suitable for carrying out said method.
39 Citations
10 Claims
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1. A method for starting a power plant of the type having a gas turbine, a steam turbine and a continuous-flow steam generator, comprising:
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positioning the steam turbine downstream of the gas turbine and applying heat exhausted from the gas turbine as a heating gas in the steam generator by; (i) providing an evaporator continuous-flow heating surface that is arranged in a heating gas duct through which the flow is capable of flowing in an approximately horizontal heating gas direction, and which comprises a number of steam generator tubes connected in parallel to allow a flow medium to flow through; and (ii) providing a superheater heating surface that is connected downstream of the evaporator continuous-flow heating surface on the flow medium side and which comprises a number of superheater tubes connected in parallel to allow the evaporated flow medium to flow through, and (iii) positioning the evaporation end point of the flow medium in the superheater tubes to temporarily limit the temperature of the flow medium at an exit of the superheater heating surface while starting up the steam turbine. - View Dependent Claims (2, 3)
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4. A power plant comprising a gas generator, continuous-flow steam generator coupled to generate steam with heat exhausted by the gas turbine and a steam turbine coupled to receive the generated steam, the steam generator comprising:
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a heating gas duct arranged to provide a flow in an approximately horizontal heating gas direction; an evaporator continuous-flow heating surface that comprises a number of steam generator tubes connected in parallel to allow a flow medium to flow therethrough; and a superheater heating surface connected downstream of the evaporator continuous-flow heating surface and which comprises a number of superheater tubes connected in parallel to allow the evaporated flow medium to flow therethrough, wherein the evaporator continuous-flow heating surface and the superheater heating surface are interconnected into a functional unit in such a way that the evaporation end point of the flow medium can be displaced into the superheater heating surface. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification