Supporting structure of low-pressure cylinder module of high-power nuclear steam turbine

Abstract

The invention discloses a supporting structure of a low-pressure cylinder module of a high-power nuclear steam turbine. The low-pressure cylinder module is positioned on a base platform and comprises an outer cylinder, an inner cylinder and a rotor, wherein the inner cylinder is positioned in the outer cylinder; a low-pressure end part steam seal is arranged on the end part of the rotor; the outer cylinder is supported on the base platform; a plurality of inner cylinder cat foot supports are arranged on the inner cylinder, are extended out of the outer cylinder and are supported on a supporting component of the base platform; and the rotor is supported on the base platform through a rotor bearing support base. Due to the adoption of the supporting structure, the design difficulty of the outer cylinder and the base platform can be reduced, the production cost can be reduced, and the economy and the safety of the turbine are effectively improved.

Description

technical field [0001] The invention relates to the field of steam turbines, in particular to a support structure for a low-pressure cylinder module of a high-power nuclear power steam turbine. Background technique [0002] Due to the relatively small size and light weight of the traditional thermal power full-speed steam turbine low-pressure cylinder module, the rigidity of the outer cylinder is relatively good. Therefore, the following support methods are usually adopted: the outer cylinder is supported on the base plate, the inner cylinder is supported on the outer cylinder through the horizontal split flange, and the rotor is supported on the bearing seat integrated with the outer cylinder. Although this support structure is mature and reliable, it has its limitations: the design of the low-pressure outer cylinder must have sufficient rigidity, otherwise the deformation of the inner cylinder supported on the outer cylinder will increase to an unacceptable level when it i...

AI Technical Summary

Problems solved by technology

Although this support structure is mature and reliable, it has its limitations: the design of the low-pressure outer cylinder must have sufficient rigidity, otherwise the deformation of the inner cylinder supported on the outer cylinder will increase to an unacceptable level when it is running in a hot state. Affects the dynamic and static clearance between the inner cylinder and the rotor

If the traditional low-voltage module support structure is still used, the following three problems will inevitably arise: First, the design of the outer cylinder is extremely difficult, and the rigidity is difficult to meet the requirements. If the rigidity of the outer cylinder is blindly strengthened, it will lead to The substantial increase in weight will bring enormous pressure to the design of the basic platform, and at the same time will lead to a substantial increase in the cost of the product; the second is the deformation control problem of the low-pressure inner cylinder, due to the lack of rigidity of the outer cylinder, resulting in deformation of the outer cylinder It will be superimposed on the inner cylinder, so that the deformation of the inner cylinder will be greatly increased, which will affect the dynamic and static clearance of the steam turbine. If the dynamic and static clearance is set too small, it will affect safety, and if it is set too large, it will affect economy; The strength design of the cylinder is difficult. The inner cylinder plus the weight of the rotor is nearly 800 tons, all of which are supported by the outer cylinder, which greatly increases the difficulty of the strength design of the outer cylinder.

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