Ion exchange column suitable for irradiation test loop

Abstract

The invention relates to the technical field of irradiation test loop equipment, and provides an ion exchange column suitable for an irradiation test loop, the ion exchange column comprises an outer cylinder and an inner cylinder used for placing the ion exchange column, the lower end of the outer cylinder is provided with a water outlet pipe communicated with the inner cylinder, the upper end of the outer cylinder is connected with an end flange, and the inner spherical surface of the end flange is cooperatively connected with a sealing plug. The sealing plug is provided with a water inlet pipe communicated with the inner cylinder, the end flange is in bolted connection with a gland flange used for pressing the sealing plug and fixing the sealing plug in the end flange, the outer cylinder and the inner cylinder are arranged in a sleeve structure, and the gland flange and the end flange are connected through bolts so as to abut against the sealing plug and the end flange, so that spherical surface sealing fit is achieved; the requirement for assembly precision is lowered, the flexibility and quickness of assembly are improved, and therefore the exposure dose of operators is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of radiation test loop equipment, in particular to an ion exchange column suitable for the radiation test loop. Background Art

[0002] The irradiation test loop is an important facility for irradiation testing of new fuel elements. It is designed to simulate the operating conditions of the primary loop of a nuclear reactor and conduct experiments on the fuel elements under nuclear conditions. During the test, the fuel elements and their structural materials will continuously produce activation products under the action of the reactor radiation field, forming impurity ions that enter the primary loop coolant system, causing the coolant water quality to deteriorate, increasing the safety risks of the fuel element irradiation test.

[0003] In order to remove impurity ions in the coolant and achieve water purification, the ion exchange method is usually used, that is, the resin in the ion exchange column is used to adsorb the impurity ions in the coolant. The ion exchange column is usually cylindrical and arranged upright. The water to be purified flows in from the top inlet. When passing through the ion exchange resin inside, the impurity ions are adsorbed, and the purified water flows out from the bottom outlet.

[0004] Since the operating pressure of the irradiation test loop is high and the coolant is highly radioactive, the ion exchange column must have good pressure resistance and sealing performance to prevent any trace of radioactive water leakage. At the same time, in order to reduce the operation time and reduce the radiation dose of the operator, the design of the ion exchange column should be easy to assemble and operate. In addition, the ion exchange resin needs to be replaced in time after adsorption saturation, so the ion exchange column also needs to have the function of quickly replacing the resin.

[0005] Although ion exchange columns are widely used in the water treatment industry, conventional ion exchange columns cannot meet their needs due to the particularity of the irradiation test loop. Summary of the invention

[0006] The object of the present invention is to provide an ion exchange column suitable for an irradiation test loop, which solves the above technical problems, reduces the assembly precision requirements, improves the flexibility and quickness of assembly, and reduces the radiation dose of operators.

[0007] The present invention is achieved through the following technical scheme: an ion exchange column suitable for an irradiation test circuit, comprising an outer cylinder and an inner cylinder for placing the ion exchange column, the lower end of the outer cylinder is provided with a water outlet pipe connected to the inner cylinder, the upper end of the outer cylinder is connected with an end flange, the inner spherical surface of the end flange is matched with a sealing plug for sealing against the inner cylinder, the sealing plug is provided with a water inlet pipe connected to the inner cylinder, and the end flange is bolted with a pressure cover flange for pressing the sealing plug to be fixed in the end flange.

[0008] Furthermore, the inner cylinder comprises a cylinder body, the upper end of the cylinder body is connected to a ring, the ring is connected to a first filter screen stacked and sandwiched by a first grid plate, and the lower end of the cylinder body is connected to a second filter screen stacked and sandwiched by a second grid plate.

[0009] Preferably, a lifting ring is connected to the center of the first grid plate, and the sealing plug is connected to a water distribution plate abutting against the lifting ring for evenly dispersing the water flow.

[0010] Preferably, the hanging ring is an elastic ring structure.

[0011] Preferably, a stepped hole is provided in the end flange, the stepped hole comprises a first stepped surface and a second stepped surface, the first stepped surface is a frustum surface, and the second stepped surface is engaged with the circular ring.

[0012] Preferably, the sealing plug is in a stepped cylindrical shape, consisting of a large diameter section and a small diameter section, the end face of the large diameter section is a spherical surface that matches the first step surface, and the small diameter section is connected to the positioning hole provided on the gland flange.

[0013] Furthermore, a lower end cap is welded to the lower end of the outer cylinder, and a through hole for connecting to the water outlet pipe is opened at the center of the lower end cap.

[0014] The present invention has at least the following advantages and beneficial effects:

[0015] (1) The sleeve structure of the outer tube and the inner tube is set, and the gland flange and the end flange are bolted to tighten the sealing plug and the end flange to achieve spherical sealing, which reduces the assembly accuracy requirements, improves the flexibility and speed of assembly, and thus reduces the radiation dose of the operator;

[0016] (2) The elastic annular structure provided by the first grid plate provides a force application position for lifting the inner cylinder, which is convenient for replacing the ion exchange resin filled in the inner cylinder, and provides a certain pressing force for fixing the inner cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure of an ion exchange column suitable for an irradiation test circuit provided by the present invention;

[0019] Figure 2 A schematic diagram of the structure of an outer cylinder in an ion exchange column suitable for an irradiation test circuit provided by the present invention;

[0020] Figure 3 A schematic diagram of the structure of an inner cylinder in an ion exchange column suitable for an irradiation test circuit provided by the present invention;

[0021] Figure 4 For the present invention Figure 2 A partial enlarged view of the middle A;

[0022] Figure 5 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0023] Figure 6 For the present invention Figure 3 A partial enlarged view of point C in the middle;

[0024] Icon: 1-outer cylinder, 10-outlet pipe, 11-lower head, 110-through hole, 2-inner cylinder, 21-cylinder body, 22-ring, 23-first grid plate, 24-first filter screen, 25-second grid plate, 26-second filter screen, 27-lifting ring, 3-end flange, 30-step hole, 301-first step surface, 302-second step surface, 4-sealing plug, 40-inlet pipe, 41-water distribution plate, 5-pressure cover flange. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example

[0028] like Figure 1-6As shown, in this embodiment, an ion exchange column suitable for an irradiation test loop is mainly disclosed, which can effectively withstand the high pressure of the irradiation test loop, and the resin can be replaced conveniently and quickly, reducing the radiation dose of operators. The column comprises an outer cylinder 1 and an inner cylinder 2 for placing the ion exchange column. The lower end of the outer cylinder 1 is provided with a water outlet pipe 10 connected to the inner cylinder 2, the upper end of the outer cylinder 1 is connected with an end flange 3, the inner spherical surface of the end flange 3 is matched with a sealing plug 4, the sealing plug 4 is provided with a water inlet pipe 40 connected to the inner cylinder 2, and the end flange 3 is bolted with a gland flange 5 for pressing the sealing plug 4 to fix it in the end flange 3; specifically, the outer cylinder 1 is a high-pressure resistant thick-walled container in the shape of a circular tube, which is used to withstand the high pressure of the irradiation test loop and has a reliable sealing structure to ensure that the high-pressure water will not leak; the inner The cylinder 2 is a thin-walled container in a circular tube shape. The inner cylinder 2 is installed inside the outer cylinder 1 with a clearance fit, and is used to accommodate ion exchange resin, and can facilitate the rapid replacement of ion exchange resin; the end flange 3 can be a tapered neck flange structure that gradually expands from bottom to top, and its lower part is aligned and welded with the outer cylinder 1; since the sealing plug 4 is spherically matched with the end flange 3, it is adaptive. Even if the sealing plug 4 and the end flange 3 are not assembled accurately and there is a certain inclination, the gland flange 5 is bolted to the end flange 3 so that the gland flange 5 abuts against the sealing plug 4, and the sealing plug 4 and the end flange 3 can still be fully contacted to achieve compression and sealing, so it can be easily and quickly assembled, reducing the requirements for assembly accuracy; at the same time, there is no need to install additional sealing gaskets, which reduces the use of accessories and makes assembly convenient and fast.

[0029] Furthermore, in the specific implementation, Figure 1 , 3 , 5, and 6, the inner cylinder 2 provided in the embodiment of the present invention includes a cylinder 21, the upper end of the cylinder 21 is connected to a ring 22, the ring 22 is connected to a first filter screen 24 stacked and sandwiched by a first grid plate 23, and the lower end of the cylinder 21 is connected to a second filter screen 26 stacked and sandwiched by a second grid plate 25; specifically, the cylinder 21 is the main volume space for filling the ion exchange resin, adopts a thin-walled structure with light weight, and is easy to replace and operate. The first grid plate 23 and the second grid plate 25 are evenly opened with holes. The first grid plate 23 and the second grid plate 25 are respectively provided with two stacked pieces, and the first filter screen 24 and the second filter screen 26 are clamped and fixed respectively by bolts. The upper end of the cylinder 21 is welded to the end face of the ring 22, the inner diameter of the ring 22 is smaller than the inner diameter of the cylinder 21, and the outer diameter of the ring 22 is larger than the outer diameter of the cylinder 21. After the first grid plate 23 and the first filter screen 24 are combined, they are fastened to the ring 22 by bolts; the lower end of the cylinder 21 can be directly welded to the outer edge of the second grid plate 25 on the upper layer;

[0030] Preferably, a lifting ring 27 is connected to the center position of the first grid plate 23, and the sealing plug 4 is connected to a water dividing plate 41 that abuts against the lifting ring 27 for evenly dispersing the water flow; specifically, the lifting ring 27 can be used as a force application position for lifting the inner cylinder 2, so as to facilitate the separation of the outer cylinder 1 and the inner cylinder 2, and then the first grid plate 23 and the first filter screen 24 assembled on the upper end of the cylinder body 21 can be removed to open the inner cylinder 2 and replace the ion exchange resin; on the other hand, the lifting ring 27 is an elastic ring structure, and the lifting ring 27 can be pressed by the water dividing plate 41 connected by bolts of the sealing plug 4, thereby providing a certain pressing force for fixing the inner cylinder 2.

[0031] Preferably, in the specific implementation, Figure 1 , 2 As shown in Figures 4 and 5, a stepped hole 30 is provided in the end flange 3 provided in the embodiment of the present invention. The stepped hole 30 includes a first stepped surface 301 and a second stepped surface 302. The first stepped surface 301 is a conical surface, and the second stepped surface 302 is engaged with the ring 22. Preferably, the sealing plug 4 is in a stepped cylindrical shape, consisting of a large diameter section and a small diameter section. The end face of the large diameter section is a spherical surface that cooperates with the first stepped surface 301, and the small diameter section is engaged with the positioning hole provided on the gland flange 5. Specifically, the small diameter section and The large diameter section can be coaxially arranged up and down, and the cooperation between the sealing plug 4 and the end flange 3 as well as the pressure cover flange 5 constitutes a labyrinth seal to ensure the sealing of the assembly; the circular ring 22 is tightly fitted and clamped on the second step surface 302. On the one hand, it supports the inner cylinder 2 and stably fixes the inner cylinder 2 in the outer cylinder 1; on the other hand, it blocks the gap channel between the inner cylinder 2 and the outer cylinder 1, so that the water flowing in from the water inlet pipe 40 can all flow through the inner cylinder 2 and fully contact with the ion exchange resin filled in the inner cylinder 2 to achieve a better water purification effect.

[0032] Furthermore, in the specific implementation, Figure 1 , 2 As shown, a lower head 11 is welded to the lower end of the outer cylinder 1 provided in an embodiment of the present invention, and a through hole 110 for connecting to the water outlet pipe 10 is opened at the center of the lower head 11; specifically, the lower head 11 is a disc structure, and the outer edge of the lower head 11 is smoothly welded to the outer cylinder 1, and the water outlet pipe 10 is welded at the circular hole at the bottom of the lower head 11 as the outlet of the ion exchange column.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ion exchange column suitable for an irradiation test circuit, characterized in that: The invention comprises an outer cylinder (1) and an inner cylinder (2) for accommodating an ion exchange column, wherein the lower end of the outer cylinder (1) is provided with a water outlet pipe (10) connected to the inner cylinder (2), the upper end of the outer cylinder (1) is connected with an end flange (3), the inner spherical surface of the end flange (3) is connected with a sealing plug (4), the sealing plug (4) is provided with a water inlet pipe (40) connected to the inner cylinder (2), and the end flange (3) is bolted with a gland flange (5) for pressing the sealing plug (4) to fix it in the end flange (3).

2. An ion exchange column suitable for an irradiation test circuit as claimed in claim 1, characterized in that: The inner cylinder (2) comprises a cylinder body (21), the upper end of the cylinder body (21) is connected to a circular ring (22), the circular ring (22) is connected to a first filter screen (24) stacked and sandwiched by a first grid plate (23), and the lower end of the cylinder body (21) is connected to a second filter screen (26) stacked and sandwiched by a second grid plate (25).

3. An ion exchange column suitable for an irradiation test circuit as claimed in claim 2, characterized in that: A lifting ring (27) is connected to the center of the first grid plate (23), and the sealing plug (4) is connected to a water distribution plate (41) abutting against the lifting ring (27) for evenly dispersing water flow.

4. An ion exchange column suitable for an irradiation test circuit as claimed in claim 3, characterized in that: The hanging ring (27) is an elastic ring structure.

5. An ion exchange column suitable for an irradiation test circuit as claimed in claim 2, characterized in that: A stepped hole (30) is provided in the end flange (3), and the stepped hole (30) comprises a first stepped surface (301) and a second stepped surface (302), wherein the first stepped surface (301) is a frustum surface, and the second stepped surface (302) is engaged with the circular ring (22).

6. An ion exchange column suitable for an irradiation test circuit as claimed in claim 5, characterized in that: The sealing plug (4) is in the shape of a stepped cylinder and consists of a large diameter section and a small diameter section. The end face of the large diameter section is a spherical surface that matches the first stepped surface (301), and the small diameter section is matched and connected with a positioning hole provided on the gland flange (5).

7. An ion exchange column suitable for an irradiation test circuit as claimed in claim 1, characterized in that: A lower sealing head (11) is welded to the lower end of the outer cylinder (1), and a through hole (110) for connecting with the water outlet pipe (10) is provided at the center of the lower sealing head (11).

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