CN103726891A

CN103726891A - Hollow separation board for turbine

Info

Publication number: CN103726891A
Application number: CN201410033260.9A
Authority: CN
Inventors: 张俊博; 姚福锋; 赵俊波; 刘统章; 韦俊
Original assignee: 703th Research Institute of CSIC
Current assignee: 703th Research Institute of CSIC
Priority date: 2014-01-24
Filing date: 2014-01-24
Publication date: 2014-04-16

Abstract

The invention provides a hollow separation board for a turbine. The hollow separation board is characterized by adopting a suction structure of hollow guide vanes with cracks and inner and outer ring cavities; the water removal cracks are formed in the 3/4 position of the inner arcs and the 1/5 position of the back arcs, which are close to the roots of the guide vanes, of the guide vanes; cavities of the hollow guide vanes are communicated with the inner and outer ring cavities for the separation board; the outer ring cavity is connected with an outer cylinder through a pipeline, so as to form negative micro-pressure. The hollow separation board provided by the invention has the beneficial effects in that the cracks are formed in the positions in which water drops are deposited on the surfaces of blade grids of the hollow guide vanes, so that the dehumidification can be realized through the hollow separation board for the turbine; the water drops are removed through differential pressure between the inside and the outside of each crack, so that the guide vanes are prevented from being corroded by the water drops.

Description

A kind of steam turbine hollow shelf

technical field:

The present invention relates to mechanical equipment technical field, refer in particular to a kind of steam turbine hollow shelf.

background technique:

Steam turbine, as topmost heating power prime mover, occupies extremely important status in the fields such as the energy, electric power and energetics.Along with greatly developing of large capacity, high parameter thermal power steam turbine and nuclear steam turbine etc., it is day by day serious that turbine for wet steam problem becomes.

The blade of steam turbine often works in wet-steam region.Along with the expansion of steam, its humidity increases, and just has water droplet and produces gradually.The motion of these water droplets will rely on main steam to drive, and need to consume the part energy of main steam; Droplets impact its movable vane leading edge back of the body arc, stops movable vane motion, has increased moving blade loss; Because water droplet constantly clashes into movable vane, blade surface is corroded, profile loss increases simultaneously; The movement velocity of steam and water droplet etc. also can not make to produce whirlpool in vapor stream, has destroyed the molded line shape of blade, and stage efficiency is declined.In a word, the water droplet in wet vapor has not only reduced stage efficiency, and has corroded moving vane, has shortened the operating life of blade, has increased the potential safety hazard of unit operation.

summary of the invention:

The object of this invention is to provide a kind of steam turbine hollow shelf, reduce steam moisture and the large water droplet content of steam turbine, prevent or alleviate movable vane water erosion.

The object of the invention is to realize as follows: a kind of steam turbine hollow shelf, is characterized in that: this hollow shelf adopts hollow guide vane crack gap, dividing plate inside and outside ring cavity suction structure; In blade concavity 3/4 position, the back of the body arc 1/5 position near blade root position, offer the gap of anhydrating, the cavity UNICOM dividing plate inside and outside ring chamber of hollow guide vane, outer shroud chamber connects outer shell by pipeline, and forms micro-negative pressure.

The invention has the beneficial effects as follows, it is that gap is offered in position at hollow stator leaf grating surface droplet deposition that steam turbine hollow shelf dries, and utilizes the inside and outside pressure reduction in gap to remove water droplet, prevents the erosion of water droplet to movable vane.

accompanying drawing explanation:

Fig. 1 is structural representation plan view of the present invention;

Fig. 2 is that structural representation A-A of the present invention is to sectional view;

Fig. 3 is inside and outside ring structure schematic diagram of the present invention.

In figure: outer shroud 1, interior ring 2, outer shroud closure plate 3, interior ring closure plate 4

embodiment:

With reference to accompanying drawing, a kind of steam turbine hollow shelf, is characterized in that: this hollow shelf adopts hollow guide vane crack gap, dividing plate inside and outside ring cavity suction structure; In blade concavity 3/4 position, the back of the body arc 1/5 position near blade root position, offer the gap of anhydrating, the cavity UNICOM dividing plate inside and outside ring chamber of hollow guide vane, outer shroud chamber connects outer shell by pipeline, and forms micro-negative pressure.Interior ring 2 and outer shroud 1 adopt casting welded structure, and interior ring closure plate 4 and outer shroud closure plate 3 are welded in inner and outer rings, form inner and outer rings chamber.Hollow shelf of the present invention is different from traditional partition board of steam turbine, and this hollow shelf adopts hollow guide vane crack gap, dividing plate inside and outside ring cavity suction structure compared with traditional steam turbine.Wet vapor when the hollow shelf, drops in stator surface deposition to the larger flood of unit harm and forms moisture film and flow along airflow direction, in blade concavity end and back of the body forearc end water film thickness maximum, and from leaf, pushes up blade root position moisture film and converges more remarkable along leaf is high.In inner arc 3/4 position, the back of the body arc 1/5 position near blade root position, offer the gap of anhydrating, the cavity UNICOM dividing plate inside and outside ring chamber of hollow guide vane, outer shroud chamber connects outer shell by pipeline and forms micro-negative pressure, suction is through the moisture film of gap position, reach the object that reduces steam moisture and large water droplet content, thereby improve the safety reliability of unit.

Claims

1. a steam turbine hollow shelf, is characterized in that: this hollow shelf adopts hollow guide vane crack gap, dividing plate inside and outside ring cavity suction structure; In blade concavity 3/4 position, the back of the body arc 1/5 position near blade root position, offer the gap of anhydrating, the cavity UNICOM dividing plate inside and outside ring chamber of hollow guide vane, outer shroud chamber connects outer shell by pipeline, and forms micro-negative pressure.