Special plane slit vortex type desalter filtering device for nuclear power station

Abstract

The invention relates to the technical field of nuclear power stations and in particular relates to a special plane slit vortex type desalter filtering device for a nuclear power station. The plane slit vortex type desalter filtering device consists of an adapter pipe, a water guide port, a sealing tape, a filtering barrel, a sealing ring, a baffle, a sealing side strip, a supporting barrel, a water outlet, a core column, a water guide sleeve, a fastening nut and a plurality of limiting sleeve discs, wherein a fan-shaped filter disc is arranged on the outer side face of each upper positioning ring; an elongated slit is formed in each filter disc; an elastic clamp which is integrated with the corresponding filter disc is arranged on the upper surface of the arc edge of the corresponding filter disc and consists of a cubic block and a rectangular strip; and the cubic block and the upper surface of the corresponding filter disc are integrated. Compared with the prior art, the special plane slit vortex type desalter filtering device has a higher filtering efficiency and mounting efficiency and is good in durability.

Description

technical field [0001] The invention relates to the technical field of nuclear power plants, in particular to a special planar slit eddy current desalter filter device for nuclear power plants. Background technique [0002] The inlets and outlets of the yin bed, yang bed, and wet bed of the water treatment equipment desalter of the existing nuclear power plant are all equipped with filter head devices, also known as water caps, which are used to prevent the passage of ion exchange resins, but can Purified water is passed through to obtain clean water. [0003] The existing filter head structures include wire-wound type and laminated type. The wire-wound filter head is easy to be damaged. When the steel wire is wound, it needs to be fixed on the skeleton by spot welding. The welding deformation is large, the steel wire has low strength and is easy to deform, and the gap between the steel wire and the steel wire is difficult to control. The filter tube of the laminated filte...

AI Technical Summary

Problems solved by technology

The wire-wound filter head is easy to be damaged. When the steel wire is wound, it needs to be fixed on the frame by spot welding. The welding deformation is large, the strength of the steel wire is low, and it is easy to deform. The gap between the steel wire and the steel wire is difficult to control.

The filter tube of the laminated filter head is composed of several filter sheets with the same structure. Each filter sheet has a symmetrical small boss in the cross direction, which is integrated with the filter sheet. Therefore, after several sheets are stacked and combined Four ribs are formed in the axial direction, and four filter slits are formed at equidistant intervals along the circumference between the connected two pieces. This device is not easy to be damaged compared with the wire-wound filter head. Its disadvantages are:

[0004] 1. Since the height of the small bosses is easy to deviate during production, and the filter gap between the sheets is controlled by the contact of the small bosses at four parts, this will make the filter gaps uneven in size and biased. The loss of ion exchange resin will occur in large places

[0005] 2. Since there are four small bosses between every two adjacent filter pieces, this also reduces the water permeability of the filter head

[0007] 1. The processing procedure of the filter tube is cumbersome, and the processing precision is very high, and the processing difficulty is relatively high;

[0008] 2. Due to the vibration of the long-term water flow impact on the filter, individual filters will be fatigued and broken under repeated high-frequency bending

Due to the limited length of the filter head, increasing the thickness of the filter sheet will undoubtedly reduce the number of filter gaps, which will greatly reduce the water permeability of the filter head and reduce the use efficiency of the device

[0009] 3. In the above scheme, all the filters are an inseparable whole, which brings great difficulty to the regular dismantling and washing work and greatly reduces the efficiency of dismantling and washing work

[0013] Since all the filter gaps of the device have the same width, and the particle size of the ion exchange resin is different, during the filtration process, the smaller resin particles will fill the gaps between the larger particles, so that the size Different particles are combined into a thicker block, which reduces the filtration efficiency of the device

[0014] 3. Since each sheet body composed of an end piece and a tie piece must simultaneously and accurately set its three collar pieces on the three tie rods that form a dynamic cooperation relationship with it, it has a high assembly accuracy requirement , so the assembly process is not efficient

[0015] 4. Each end piece is fixed by a pull piece and three fixed tie rods that run through the filter head of the desalter longitudinally, which determines that the three end pieces of each layer are in the same position in the horizontal direction. Therefore, the overlapping end pieces will form three ribs in the longitudinal direction of the filter device, and the part of the filter at the position of these three ribs will have strong rigidity, while the rest of the filter will not be supported by any other components. Weaker, therefore, the rigidity of each filter is not evenly distributed

Under the long-term impact of water flow, this uneven distribution of rigidity will cause the filter to break due to long-term high-frequency vibration

This undoubtedly reduces the durability and impact strength of the device

[0016] 5. In this device, in order to save space and improve the water passing rate of the device, the filter can only be designed as a sheet whose width is much larger than its thickness, but this design makes the rigidity of the filter in the vertical direction very weak, so in Under the impact of turbulent water flow, the filter will undergo vertical elastic high-frequency vibration due to the vertical impact force. This high-frequency vibration not only reduces the service life of the filter, but more importantly, because During its vertical vibration, the width of the gap between two adjacent filter sheets will be changed, which will reduce the filtering effect of the ion exchange resin.

[0017] 6. Since the positioning rib in the above scheme is closely attached to the end of each end piece, and its arc length exceeds the length of the end piece, this will on the one hand cause a certain resistance to the water outlet and reduce the water outlet efficiency of the device; at the same time, The positioning ribs can only limit the horizontal position of the end piece, but the three tie rods already have this function. Therefore, the existence of the positioning ribs also causes waste of materials

Increased manufacturing cost of the device

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