CN210073346U

CN210073346U - Filter device for radioactive wastewater of nuclear power station

Info

Publication number: CN210073346U
Application number: CN201920609259.4U
Authority: CN
Inventors: 赵小红; 谢洪虎; 陈楚员; 陈曌
Original assignee: China General Nuclear Power Corp; China Nuclear Power Engineering Co Ltd; CGN Power Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Engineering Co Ltd; CGN Power Co Ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-02-14
Anticipated expiration: 2029-04-29

Abstract

The utility model discloses a nuclear power station is filter equipment for radioactive waste water, it includes: an outer housing; an inner housing; the filter screen is positioned between the outer shell and the inner shell; and an inlet which sequentially penetrates through the outer shell and the filter screen and enters the inner shell; the inner shell is provided with a micro cyclone core pipe, the micro cyclone core pipe is provided with an overflow port extending out of the top of the inner shell and a bottom flow port positioned at the bottom of the inner shell, a material entering the inner shell from an inlet is separated by the micro cyclone core pipe, a water phase flows out from the overflow port, and solid particles carried by the bottom flow of the micro cyclone core pipe are intercepted in a movable ash bucket positioned below the bottom flow port through the bottom flow port.

Description

Filter device for radioactive wastewater of nuclear power station

Technical Field

The utility model belongs to the technical field of the nuclear power, more specifically say, the utility model relates to a nuclear power station is filter equipment for radioactive waste water, the production speed and the quantity of its reducible radioactive waste.

Background

The filtering device is widely applied to various circulating systems in a nuclear power station and plays a role in providing clean water quality for a water circulating system.

At present, most of nuclear power plant water filtering devices adopt filter element type filters under high-precision service conditions, however, most of the filters are in radioactive environments, and filter elements of the filters become waste filter elements with radioactivity after reaching the service life or being replaced according to requirements, and need to be isolated and stored. The periodic filter element replacement not only brings extra dosage to maintenance work, but also brings a large amount of radioactive solid waste, and the waste filter elements which are continuously generated bring great difficulty to volume reduction of the radioactive waste.

In view of the above, there is a need to provide a filtering apparatus for radioactive wastewater in a nuclear power plant, so as to prolong the service life of a filter element, slow down the generation of radioactive waste filter element, further reduce the subsequent treatment process and reduce the operation cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the defects of the prior art are overcome, and the filtering device for the radioactive wastewater of the nuclear power station is provided, so that the service life of a filter element can be prolonged, the generation of the radioactive waste filter element is slowed down, and then the subsequent treatment procedures are reduced, and the running cost is reduced.

In order to achieve the above object, the utility model provides a nuclear power station is filter equipment for radioactive waste water, it includes:

an outer housing;

an inner housing;

the filter screen is positioned between the outer shell and the inner shell; and

an inlet which sequentially penetrates through the outer shell and the filter screen and enters the inner shell;

the inner shell is provided with a micro cyclone core pipe, the micro cyclone core pipe is provided with an overflow port extending out of the top of the inner shell and a bottom flow port positioned at the bottom of the inner shell, a material entering the inner shell from an inlet is separated by the micro cyclone core pipe, a water phase flows out from the overflow port, and solid particles carried by the bottom flow of the micro cyclone core pipe are intercepted in a movable ash bucket positioned below the bottom flow port through the bottom flow port.

As the utility model discloses nuclear power station is filter equipment for radioactive wastewater's an improvement, interior casing is equipped with tube sheet and low tube sheet, little whirl core pipe is fixed in between tube sheet and the low tube sheet.

As an improvement of the filtering device for the radioactive wastewater of the nuclear power station, the bottom of the movable ash bucket adopts a filter screen structure which has the same filtering precision with the micro-cyclone core tube.

As the utility model discloses nuclear power station is filter equipment for radioactive wastewater's an improvement, interior casing lower part is equipped with the inside flange, demountable installation has the lower part casing on the inside flange, the activity ash bucket sets up in the lower part casing and is located underflow opening below.

As the utility model discloses nuclear power station is filter equipment for radioactive wastewater's a improvement, the shell body has the equipment flange, demountable installation has conical shell on the equipment flange, is equipped with the export on the conical shell.

As an improvement of the filtering device for the radioactive wastewater of the nuclear power station, the filter screen adopts a stainless steel frame and glass fiber winding deep filtration.

As an improvement of the filtering device for the radioactive wastewater of the nuclear power station, a plurality of micro cyclone core tubes are arranged on the inner shell at equal intervals.

Compared with the prior art, the utility model discloses nuclear power station is filter equipment for radioactive waste water has following technological effect:

the micro cyclone core pipe is used for replacing a filter or performing solid-liquid pre-separation, so that the number of related spare parts of the filter and the replacement amount of subsequent filter elements can be reduced, and the volume reduction of radioactive solid wastes (waste filter elements and the like) can be reduced. Due to the principle and the structural characteristics of the micro-cyclone core pipe, the micro-cyclone core pipe has the advantage of small pressure drop, and can reduce the running cost of the nuclear power station. Compared with a filter element type filter, the micro cyclone core tube has the advantages that on the premise of ensuring the filtering efficiency, the continuous operation period is longer, and the radiation risk is smaller in the replacement process of equipment parts.

Drawings

The following detailed description of the filtering device for radioactive wastewater in nuclear power plant according to the present invention is provided with reference to the accompanying drawings and specific embodiments, wherein:

fig. 1 is a schematic structural diagram of the filtering device for radioactive wastewater in a nuclear power station.

Fig. 2 is a schematic sectional view of the filtering apparatus for radioactive wastewater in a nuclear power plant along the line a-a.

Detailed Description

In order to make the objects, technical solutions and technical effects of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and not limitation.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships only for convenience in describing the present invention and to simplify the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the product of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

Referring to fig. 1 and 2, the filtering apparatus for radioactive wastewater in a nuclear power station of the present invention includes:

an outer shell 10;

an inner case 20;

a filter screen 30 positioned between the outer case 10 and the inner case 20; and

an inlet 40 which sequentially penetrates through the outer shell 10 and the filter screen 30 and enters the inner part of the inner shell 20;

wherein, the inner shell 20 is provided with a micro cyclone core tube 200, the micro cyclone core tube 200 is provided with an overflow port 202 extending out of the top of the inner shell 20 and a bottom flow port 204 positioned at the bottom of the inner shell 20, after the material entering the inner shell 20 from the inlet 40 is separated by the micro cyclone core tube 200, the water phase flows out from the overflow port 202, and the solid particles entrained by the bottom flow of the micro cyclone core tube 200 are retained in a movable ash hopper 206 positioned below the bottom flow port 204 through the bottom flow port 204.

According to an embodiment of the filtering apparatus for radioactive wastewater in a nuclear power plant of the present invention, the inner shell 20 is provided with an upper tube plate 208 and a lower tube plate 210, and the micro cyclone core tube 200 is fixed between the upper tube plate 208 and the lower tube plate 210. Preferably, a plurality of micro cyclone core tubes 200 are provided on the inner housing 20 at equal intervals.

According to the utility model discloses an embodiment of nuclear power station is filter equipment for radioactive waste water, interior casing 20 lower part is equipped with internal flange 212, and demountable installation has lower part casing 214 on the internal flange 212, and movable ash bucket 206 sets up in lower part casing 214 and is located underflow opening 204 below. Preferably, the bottom of the movable ash bucket 206 is of a screen structure with the same filtering precision as the micro-cyclone core tube 200.

According to the utility model discloses an embodiment of nuclear power station is filter equipment for radioactive wastewater, shell body 10 has equipment flange 100, and demountable installation has conical shell 50 on the equipment flange 100, is equipped with export 500 on the conical shell 50.

According to the utility model discloses an embodiment, filter screen 30 adopts stainless steel frame and glass fiber winding depth filtration, and filter fineness can satisfy the technological requirement, and processing spare part is few, changes littlely than former filter core design, and separation efficiency is high, and loss of pressure is little.

According to the utility model discloses nuclear power station is filter equipment for radioactive waste water, in the cavity at filter center was fixed in through the last tube sheet 208 of interior casing 20, lower tube sheet 210 to little whirl core pipe 200, little whirl core pipe 200 is as preseparation device, and the filter screen is passed through to the purified water after the preseparation again, the change frequency of reduction filter that can be by a wide margin like this.

Referring to fig. 1 and 2, the filter device for radioactive wastewater in a nuclear power station according to the present invention has the following specific principles:

the material firstly enters the inner shell 20 tangentially from the inlet 40, and then enters the micro-cyclone core tube 200 under the action of pressure to carry out solid-liquid cyclone separation (as shown in figure 2), so as to realize solid-liquid separation. The water phase enters the overflow cavity 60 between the inner shell 20 and the filter screen 30 through the overflow port 202, the water entering the overflow cavity 60 still contains a small amount of fine particles, the overflow cavity 60 and the clear liquid area 70 at the periphery of the filter screen 30 are separated by the filter screen 30, the water enters the clear liquid area 70 under the pushing of the pressure difference, and the solid phase is attached to the surface of the filter screen 30. Solid particles carried by the underflow of the micro cyclone core tube 200 are retained in the movable ash bucket 206, the bottom of the movable ash bucket 206 adopts a filter screen structure with the same filtering precision as the micro cyclone core tube 200, so that a small amount of water in the underflow can conveniently enter the clear water area 70 through the filter screen, and clear liquid after two-stage treatment of cyclone-filtration is discharged through the outlet 500 and enters the next procedure.

When the pressure difference between the inlet and the outlet of the device is larger than a certain set value, the device flange is opened after the device is switched to another device, solids stored in the movable ash hopper 206 and solids attached to the inner surface of the filter screen 30 are removed through a special tool, and the particles are transferred to a proper place to be treated and then are put back to the original position.

Compared with the prior art, the utility model discloses nuclear power station is filter equipment for radioactive wastewater has following beneficial technological effect:

the micro cyclone core tube 200 is used for replacing a filter or performing solid-liquid pre-separation, so that the number of related spare parts of the filter and the replacement amount of subsequent filter elements can be reduced.

The volume reduction of radioactive solid wastes (waste filter elements and the like) can be reduced by replacing a filter with the micro-cyclone core tube 200 or performing solid-liquid pre-separation.

The micro cyclone core tube 200 has the advantage of small pressure drop due to the principle and the structural characteristics, and can reduce the running cost of the nuclear power station;

compared with a filter element type filter, the micro cyclone core tube 200 has the advantages that on the premise of ensuring the filtering efficiency, the continuous operation period is longer, and the radiation risk is smaller in the equipment component replacement process.

According to the above principle, the present invention can also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A nuclear power station is filter equipment for radioactive waste water, its characterized in that includes:

an outer housing;

an inner housing;

2. The filtering device for nuclear power plant radioactive wastewater according to claim 1, wherein the inner casing is provided with an upper tube plate and a lower tube plate, and the micro cyclone core tube is fixed between the upper tube plate and the lower tube plate.

3. The nuclear power plant radioactive wastewater filtering device according to claim 1, wherein the bottom of the movable ash bucket is of a filter screen structure having the same filtering precision as the micro-cyclone core tube.

4. The filtering device for nuclear power plant radioactive wastewater according to claim 1, wherein an internal flange is provided at a lower portion of the inner casing, a lower casing is detachably mounted on the internal flange, and the movable ash bucket is provided in the lower casing and located below the underflow port.

5. The filtering device for the radioactive wastewater in the nuclear power station as claimed in claim 1, wherein an equipment flange is arranged below the outer shell, a conical shell is detachably mounted on the equipment flange, and an outlet is formed in the conical shell.

6. The filtering device for nuclear power plant radioactive wastewater according to claim 1, wherein the filtering net is deeply filtered by winding a stainless steel frame and glass fiber.

7. The filtering device for nuclear power plant radioactive wastewater according to any one of claims 1 to 6, wherein a plurality of micro cyclone core tubes are provided at equal intervals on the inner casing.