A monolithic inert gas adsorption device

Abstract

The present application relates to the field of nuclear industry radioactive gas treatment, and particularly relates to a whole inert gas adsorption device, which comprises a plurality of adsorption units, a gas flow inlet, a gas flow outlet, an insert plate, a sieve plate and a shell, the adsorption units are arranged side by side, the adsorption units are filled with adsorption material, the outer walls of the adsorption units form the shell of the device, the top ends of the adsorption units are provided with openings, the top end openings of the adsorption units at two ends are respectively the gas flow inlet and the gas flow outlet, sieve plates are respectively arranged at the junctions of two adsorption units, and the insert plate is arranged between the two sieve plates at the junction of the adsorption units. The device adjusts the flow rate of the internal adsorption layer by adjusting the insert plate, the insert plate can also realize the layered desorption of the adsorbed inert gas, and the active carbon can be replaced in layers in the case of invalidation, without the need to replace all the active carbon, and the amount of waste generated is small.

Description

Technical Field

[0001] This invention relates to the field of radioactive gas treatment in the nuclear industry, and in particular to an integrated inert gas adsorption device. Background Technology

[0002] During the operation of nuclear power plants, radioactive inert gases are generated. These gases are chemically stable and can cause radiation exposure to the human body. From the perspective of ensuring the safety of nuclear facilities, protecting the environment and public safety, and meeting regulatory requirements, nuclear facilities must treat the generated radioactive inert gases.

[0003] Currently, nuclear facilities mostly employ compression storage or activated carbon adsorption techniques to treat radioactive inert gases, reducing the radioactivity level of process waste gases through radionuclide decay. However, in existing technologies, some nuclear power plants have relatively high short-term exhaust rates, and the compression storage equipment used alone is bulky. Furthermore, the distributed layout of split-type retention beds makes it impossible to adjust the airflow velocity within the carbon bed. Therefore, radioactive inert gases in nuclear power plants cannot be completely absorbed, leading to environmental and public safety hazards. Summary of the Invention

[0004] This invention provides an integrated inert gas adsorption device to solve the problems of dispersed layout and inability to adjust the airflow velocity in the carbon layer in existing inert gas adsorption devices.

[0005] The technical solution of the present invention is as follows:

[0006] This invention proposes an integral inert gas adsorption device, which includes several adsorption units, an air inlet, an air outlet, a insert plate, a sieve plate, and a shell. The adsorption units are arranged side by side, and the interior of each adsorption unit is filled with adsorbent material. The outer walls of the adsorption units form the shell of the device. Each adsorption unit has an opening at its top, and the top openings of the adsorption units at both ends are the air inlet and the air outlet, respectively. A sieve plate is provided at the junction of two adsorption units, and an insert plate is provided between the two sieve plates at the junction of the adsorption units.

[0007] In some embodiments, the housing is a horizontal rectangular box, and the housing is made of 304 stainless steel or 316 stainless steel; the top opening flange of the adsorption unit at both ends is connected to the activated carbon loading and unloading port, which is used for loading and unloading activated carbon. The top of the activated carbon loading and unloading port is provided with a flange blind plate, and the upper end of the insert plate and the flange blind plate are provided with stainless steel handles.

[0008] In some embodiments, the adsorbent material is activated carbon, which is filled in layers and compacted. The particle size of the activated carbon ranges from 10 to 20 mesh.

[0009] In some embodiments, the air inlet is connected to the air duct inlet by welding or flange, and the air outlet is connected to the air duct outlet by welding or flange.

[0010] In some embodiments, the sieve plate is provided with uniformly distributed small holes, the diameter of which is smaller than that of the activated carbon, and the area of ​​the small holes accounts for 60% of the sieve plate. The sieve plate is made of 304 stainless steel or 316 stainless steel, and the sieve plate is connected to the inner wall of the shell by spot welding.

[0011] In some embodiments, the insert plate is placed between two sieve plates. One end of the insert plate is fixed to the housing by a sealing strip, and the other end of the insert plate is located inside the device and is a certain distance away from the housing at the other end. The insert plate can move up and down to adjust the distance between the insert plate and the housing at the other end. The two adjacent insert plates are in opposite directions. Due to the obstruction of the insert plates, the airflow enters the device through the airflow inlet and forms an S-shaped air path.

[0012] In some embodiments, the sealing strip is an L-shaped metal, and the sealing strip is connected to the housing by bolts, with a sealing strip between the sealing strip and the housing; the sealing strip is connected to the insert plate by bolts, with a sealing strip between the sealing strip and the insert plate; the sealing strip and the sealing strip are bonded together by sealant, and the sealing strip is a rectangular sealing strip made of rubber or polytetrafluoroethylene.

[0013] In some embodiments, the insert plate has multiple threaded holes at one end of the outer side of the housing. The threaded holes are used to connect with the sealing strip. The insert plate and the sealing strip are connected through different threaded holes to realize the insertion depth adjustment of the insert plate.

[0014] In some embodiments, one end of the insert plate is fixed to the housing by a sealing strip, and the other end is provided with a flexible sealing strip at the position corresponding to the inner wall of the housing. The flexible sealing strip is a semi-cylindrical sealing strip, the flexible sealing strip is made of rubber, and the flexible sealing strip is tightly bonded to the inner wall of the adsorption device by sealant.

[0015] In some embodiments, each adsorption unit is provided with an activated carbon sampling port on its side shell. The activated carbon sampling port is used to sample and detect the activated carbon inside the device. The shell is welded to the support.

[0016] The following benefits can be obtained by implementing this invention.

[0017] This invention proposes an integrated inert gas adsorption device. This device features an integrated design, minimizing pipeline construction and facilitating quick and easy installation. The device adjusts the airflow velocity within the internal adsorption layer by adjusting the insert plates. The insert plates also enable stratified desorption of the adsorbed inert gas. In the event of activated carbon failure, stratified replacement is possible without replacing all activated carbon, resulting in minimal waste generation. Attached Figure Description

[0018] Figure 1This is a schematic diagram of an integral inert gas adsorption device according to an embodiment of the present invention;

[0019] Figure descriptions: 1. Airflow inlet; 2. Airflow outlet; 3. Activated carbon sampling port; 4. Insert plate; 5. Sealing strip; 6. Flexible sealing strip; 7. Sieve plate; 8. Activated carbon loading and unloading port; 9. Shell; 10. Support. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, the present invention proposes an integral inert gas adsorption device, which includes several adsorption units, activated carbon sampling port 3, insert plate 4, sealing strip 5, flexible sealing strip 6, sieve plate 7, activated carbon loading and unloading port 8, shell 9 and airflow inlet 10.

[0022] The device includes several adsorption units arranged side by side. All adsorption units share a common housing 9, which is a horizontal rectangular box made of 304 or 316 stainless steel.

[0023] The adsorption unit has an opening at the top. The openings on the top of the adsorption units on both sides of the device are respectively the air inlet 1 and the air outlet 2. The top opening of the rightmost adsorption unit is the air inlet 1, and the top opening of the leftmost adsorption unit is the air outlet 2. The air inlet 1 and the air outlet 2 can be connected to the airflow pipeline by welding or flange connection.

[0024] The top openings of the adsorption unit between the airflow inlet 1 and the airflow outlet 2 are all connected to the activated carbon loading and unloading port 8 via flanges to facilitate the loading and unloading of activated carbon in the partition. The activated carbon loading and unloading port 8 is opened after the equipment is installed to load activated carbon. After loading, the port is sealed with a flange blind plate, and the top of the flange blind plate is equipped with a stainless steel handle.

[0025] Each of the two adsorption units has a sieve plate 7 at its interface. Small holes are evenly distributed on the sieve plate 7, with a diameter smaller than that of the activated carbon. The area of ​​the small holes accounts for 60% of the total area of ​​the sieve plate 7. The small holes can both separate the activated carbon and prevent leakage through them, and also ensure that the airflow passage area is 60% of the total area of ​​the sieve plate 7. The sieve plate 7 is made of 304 or 316 stainless steel and is connected to the inner wall of the adsorption device by spot welding.

[0026] An insert plate 4 is provided between the two sieve plates 7 at the junction of the adsorption units. One end of the insert plate 4 is fixed to the housing 9 by a sealing strip 5, and the other end of the insert plate 4 is located inside the device, with a certain distance between it and the other end of the housing 9. The insert plate 4 can move up and down to adjust the distance between it and the other end of the housing 9, allowing airflow to pass through. The two adjacent insert plates 4 are oriented in opposite directions. Due to the obstruction of the insert plate 4, the airflow enters the device through the airflow inlet 1, forming an S-shaped air path, which increases the thickness of the adsorption bed in the direction of airflow and promotes the mass transfer process of adsorption. The insert plate 4 has multiple threaded holes on one end of the housing 9. These threaded holes are used to connect with the sealing strip 5 by bolts. By connecting the insert plate 4 and the sealing strip 5 through different threaded holes, the insertion depth of the insert plate 4 can be adjusted. The bolt holes for insertion into the adsorption device can be sealed in advance with plugs. The insert plate 4 has a stainless steel handle on one end of the housing 9.

[0027] The sealing strip 5 is an L-shaped metal piece. Sealing strips are installed between the L-shaped strip and the exterior of the housing 9, as well as between the L-shaped strip and the insert plate 4. The sealing strip 5 is tightly connected to the housing 9 and the insert plate 4 using bolts. The sealing strip used in the sealing strip 5 is tightly bonded to the sealing strip 5 using sealant. The sealing strip used in the sealing strip 5 is a rectangular sealing strip made of rubber or polytetrafluoroethylene. The insert plate 4 can be inserted tightly into the inner housing 9, and the adsorption bed is isolated into individual adsorption units by pressing the flexible sealing strip 6, allowing for stratified desorption of the adsorbed inert gas.

[0028] One end of the insert plate 4 is fixed to the housing 9 by a sealing strip 5, and the other end, corresponding to the inner wall of the housing 9, is provided with a flexible sealing strip 6. The flexible sealing strip 6 is a semi-cylindrical sealing strip made of rubber and is tightly bonded to the inner wall of the adsorption device with sealant. The adsorption unit is filled with activated carbon, which is filled in layers in a compacted manner. The particle size of the activated carbon in the adsorption unit ranges from 10 to 20 mesh. Each adsorption unit has an activated carbon sampling port 3 on its side housing 9 for sampling and testing the activated carbon inside the device. The housing 9 of the adsorption device is welded to a sufficiently strong airflow inlet 10.

[0029] like Figure 1 As shown, the present invention proposes an integrated inert gas adsorption device. The specific implementation method of the device is as follows: the airflow inlet 1 of the adsorption device is connected to the exhaust port of the radioactive inert gas system, and the airflow outlet 2 of the adsorption device is connected to the ventilation exhaust pipe of the nuclear power plant.

[0030] The adsorption device is a horizontal rectangular box with multiple movable plates 4 installed from the top and bottom, which divides the adsorption device into multiple adsorption units. After the exhaust gas enters the adsorption device, it flows in an S-shape. The radioactive inert gas components are adsorbed by the activated carbon in the adsorption device, and the relatively clean carrier gas components are discharged into the ventilation system through the air outlet 2.

[0031] The airflow velocity inside the adsorption device can be adjusted by the insertion depth of the movable insert plate 4 to ensure optimal mass transfer. After adsorption is complete, the insert plate 4 can be fully inserted into the adsorption device, contacting the flexible sealing strip 5 to isolate each adsorption unit, thus achieving stratification of the adsorption units and allowing the adsorption device to desorb the adsorbed inert gas. If some activated carbon becomes ineffective, the insert plate 4 can be fully inserted into the adsorption device, contacting the flexible sealing strip 5 to isolate each adsorption unit, allowing for the replacement of the activated carbon in the relevant sections, thereby reducing waste generation.

[0032] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An integrated inert gas adsorption device, characterized in that, The device includes several adsorption units, an airflow inlet (1), an airflow outlet (2), a insert plate (4), a sieve plate (7), and a housing (9). The adsorption units are arranged side by side, and the adsorption units are filled with adsorption material. The outer walls of several adsorption units form the housing (9) of the device. Each adsorption unit has an opening at its top, and the top openings of the adsorption units at both ends are the airflow inlet (1) and the airflow outlet (2), respectively. The sieve plate (7) is provided at the junction of two adsorption units, and the insert plate (4) is provided between the two sieve plates (7) at the junction of the adsorption units.

2. The integral inert gas adsorption device according to claim 1, characterized in that, The housing (9) is a horizontal rectangular box, and the housing (9) is made of 304 stainless steel or 316 stainless steel; the top opening flange of the adsorption unit at both ends is connected to the activated carbon loading and unloading port (8), which is used for loading and unloading adsorption materials. The top of the activated carbon loading and unloading port (8) is provided with a flange blind plate, and the upper end of the insert plate (4) and the flange blind plate are both provided with stainless steel handles.

3. The integral inert gas adsorption device according to claim 1, characterized in that, The adsorbent material is activated carbon, which is filled in layers and compacted. The particle size of the activated carbon is 10-20 mesh.

4. The integral inert gas adsorption device according to claim 2, characterized in that, The air inlet (1) is connected to the air inlet of the air pipeline by welding or flange, and the air outlet (2) is connected to the outlet of the air pipeline by welding or flange.

5. The integral inert gas adsorption device according to claim 3, characterized in that, The sieve plate (7) is provided with uniformly distributed small holes. The diameter of the small holes is smaller than that of the activated carbon. The area of ​​the small holes accounts for 60% of the area of ​​the sieve plate (7). The sieve plate (7) is made of 304 stainless steel or 316 stainless steel. The sieve plate (7) is connected to the inner wall of the shell (9) by spot welding.

6. The integral inert gas adsorption device according to claim 5, characterized in that, The insert plate (4) is placed between two sieve plates (7). One end of the insert plate (4) is fixed to the housing (9) by a sealing strip (5). The other end of the insert plate (4) is located inside the device and is a certain distance away from the housing (9) at the other end. The insert plate (4) can move up and down to adjust the distance between the insert plate (4) and the housing (9) at the other end. The two adjacent insert plates (4) are in opposite directions. Due to the obstruction of the insert plate (4), the airflow enters the device through the airflow inlet (1) and forms an S-shaped air path.

7. The integral inert gas adsorption device according to claim 6, characterized in that, The sealing strip (5) is an L-shaped metal, and the sealing strip (5) is connected to the housing (9) by bolts. A sealing strip is provided between the sealing strip (5) and the housing (9). The sealing strip (5) is connected to the insert plate (4) by bolts. A sealing strip is provided between the sealing strip (5) and the insert plate (4). The sealing strip is bonded to the sealing strip (5) by sealant. The sealing strip is a rectangular sealing strip and the material of the sealing strip is rubber or polytetrafluoroethylene.

8. The integral inert gas adsorption device according to claim 7, characterized in that, The insert plate (4) has multiple threaded holes at one end of the outer side of the housing (9). The threaded holes are used to connect with the sealing strip (5). The insert plate (4) and the sealing strip (5) are connected through different threaded holes to realize the insertion depth adjustment of the insert plate (4).

9. The integral inert gas adsorption device according to claim 8, characterized in that, One end of the insert plate (4) is fixed to the housing (9) by a sealing strip (5), and the other end is provided with a flexible sealing strip (6) on the inner wall of the housing (9). The flexible sealing strip (6) is a semi-cylindrical sealing strip, the material of the flexible sealing strip (6) is rubber, and the flexible sealing strip (6) is tightly bonded to the inner wall of the adsorption device by sealant.

10. The integral inert gas adsorption device according to claim 1, characterized in that, Each of the adsorption units has an activated carbon sampling port (3) on its side shell (9). The activated carbon sampling port (3) is used to sample and detect the activated carbon inside the device. The shell (9) is welded to the support (10).

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