Low-pressure nuclear turbine with 360-degree volute steam inlet type inner cylinder

Abstract

The invention provides a low-pressure nuclear turbine with a 360-degree volute steam inlet type inner cylinder, relates to the field of low-pressure nuclear turbines, and aims to solve the problems that the low-pressure part of an existing nuclear turbine is larger in an intermediate surface gap and severer in steam leakage, the inner cylinder is poor in rigidity and complicated in structure, andthe steam is poor in aerodynamic performance, large in flow loss and larger in outlet unevenness. The center of the 360-degree volute steam inlet type low-pressure inner cylinder casted by cast iron is provided with a low-pressure first-stage transverse stationary blade, the two sides of the low-pressure first-stage transverse stationary blade are symmetrically provided with multi-stage partitionplate assemblies, the two ends of the 360-degree volute steam inlet type low-pressure inner cylinder are provided with low-pressure steam exhaust flow guide rings, a low-pressure steam inlet communicating pipe penetrates through a low-pressure outer cylinder to be connected with a steam inlet of the 360-degree volute steam inlet type low-pressure inner cylinder; the reheated steam enters the 360-degree volute steam inlet low-pressure inner cylinder from the steam inlet port through the low-pressure steam inlet communicating pipe in the tangent direction. The low-pressure nuclear turbine with the 360-degree volute steam inlet type inner cylinder has the advantages that the contact distance of the intermediate surface is reduced, the steam leakage amount of the intermediate surface is effectively reduced, the structure is simple and compact, and the outlet uniformity of reheat steam is good.

Description

technical field [0001] The invention relates to the field of low-voltage nuclear power steam turbines. Background technique [0002] At present, the working principle of the low-pressure part of the existing nuclear power steam turbine is: the reheated steam from the MSR (steam-water separation reheater) flows through the valve and the connecting pipe from the upper part of the low-pressure cylinder into the double-split low-pressure cylinder, and the steam flows through the two-way channel. After the flow part does work, the low-pressure exhaust steam on both sides of the low-pressure cylinder flows down into the condenser at the bottom of each low-pressure cylinder. There is a steam extraction port at the lower part of the low-pressure cylinder, and the steam extraction is used for reheating the condensed water by low-pressure heaters at all levels. The existing nuclear power steam turbine low-pressure inner cylinder adopts a cylindrical structure. The low-pressure steam ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of large mid-section clearance and large steam leakage caused by the welding of the inner cylinder of the existing nuclear power steam turbine low-pressure part, and the inner cylinder has poor rigidity and complex structure, and the inner cylinder is caused by the steam entering the inner cylinder. The upper part of the inner cylinder is adjusted by the guide ring or the nozzle, and the steam flows directly downward, which causes the problems of poor steam aerodynamic performance, large flow loss, and large outlet unevenness, thus providing a 360° volute inlet. Low pressure nuclear power steam turbine with steam inner cylinder

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