Modularized polymorphic carbon-14 adsorption enrichment device and application method thereof

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to a modular polymorphic carbon-14 adsorption and enrichment device and an application method thereof. According to the modular polymorphic carbon-14 adsorption and enrichment device provided by the invention, the dehumidification module, the first adsorption module and the second adsorption module are arranged. The dehumidification device can dehumidify to-be-treated gas and adsorb carbon-14 carbon dioxide and carbon-14 hydrogen compounds in the to-be-treated gas. According to the present invention, the sequential adsorption of the airborne carbon-14 is adopted to replace the traditional mixing dilution mode, such that the potential safety hazard caused by the mixing dilution mode can be effectively avoided, and the polymorphic carbon-14 can be efficiently treated so as to effectively control the emission of the airborne carbon-14 of the nuclear power plant.

Description

Technical Field

[0001] The present invention belongs to the field of nuclear power technology, and in particular relates to a modular polymorphic carbon-14 adsorption enrichment device and an application method thereof. Background Art

[0002] Carbon-14 has become one of the nuclides of focus in the normal operation of nuclear power plants due to its long half-life, strong mobility, and easy entry into the biological chain and food chain. Among them, the vast majority of carbon-14 exists in the form of carbon dioxide and hydrocarbons, and is mainly discharged through the primary exhaust gas treatment system. According to relevant monitoring data, there is a concentrated emission of carbon-14 during the shutdown and overhaul of the unit, and there is a risk of exceeding the monthly emission limit. Therefore, it is necessary to control the emission of airborne carbon-14. Due to the high concentration of hydrogen in the primary exhaust gas treatment system, in order to avoid the risk of explosion of high-concentration hydrogen during the treatment process, the traditional technical route is to introduce a large amount of nitrogen for mixing and dilution to reduce the hydrogen concentration to less than 2%, and then convert most of the hydrogen into water through a hydrogen-oxygen recombiner. The treated gas is then subjected to thermal catalytic oxidation treatment to convert carbon-14 hydrocarbons into carbon-14 carbon dioxide. However, in actual operation, due to the instability of the measuring instrument and the complexity of the airflow inside the system, it is difficult to ensure the uniformity of hydrogen during the nitrogen dilution process. If the local hydrogen is too high, there will still be a risk of explosion. At the same time, a large amount of heat will be continuously released during the operation of the hydrogen-oxygen recombiner. If the heat cannot be dissipated in time, local energy accumulation will lead to explosion. Therefore, it is urgent to eliminate the potential safety hazards brought by the above technical routes to the operation of nuclear facilities. Summary of the invention

[0003] In order to overcome the problems existing in the related art, a modular polymorphic carbon-14 adsorption enrichment device and an application method thereof are provided.

[0004] According to one aspect of an embodiment of the present disclosure, there is provided a modular polymorphic carbon-14 adsorption enrichment device, the device comprising: a dehumidification module, a first adsorption module, and a second adsorption module;

[0005] The dehumidification module is used to dehumidify the gas to be treated, the first adsorption module is used to adsorb carbon dioxide in the gas to be treated, and the second adsorption module is used to adsorb hydrocarbons in the gas to be treated; a methane detector is provided at the gas outlet of the second adsorption module to detect the methane content of the treated gas;

[0006] The dehumidification module, the first adsorption module and the second adsorption module have a consistent main structure, which includes a tank body, a feed port, a discharge port, a top cover and a bracket;

[0007] An air inlet pipe is arranged at the bottom of the tank body for introducing the gas to be treated; a feed port is arranged at the top of the tank body for loading granular material into the tank body, and the granular material is used to adsorb the corresponding adsorbed substance of the module; a discharge port is arranged on the lower side of the tank body for discharging the granular material inside the tank body; the top cover is used to seal the feed port of the tank body, and an air outlet is arranged on one side of the top cover, which is connected to the air outlet pipe for outputting the treated gas in the tank body; the bottom cover is used to seal the discharge port.

[0008] In a possible implementation, an air intake check valve is provided on the air intake pipe, and an air outlet check valve is provided on the air outlet pipe.

[0009] In a possible implementation, a lower sieve plate is disposed inside the tank body to carry the granular material filled inside the tank body. The device is provided with a plurality of lower sieve plates, and the apertures of the lower sieve plates are different from each other.

[0010] In a possible implementation, a symmetrical handle is provided in the middle of the side wall of the tank body.

[0011] In one possible implementation, the top cover adopts an integrated design, integrating the top cover air inlet, the top cover air outlet, the aerosol filter membrane and the upper sieve plate. The upper sieve plate is used to prevent the granular material from dumping from the tank and blocking the top cover air outlet. The aerosol filter membrane is used to filter the aerosol particles carried by the granular material when the gas flows through, to prevent blockage of subsequent pipelines.

[0012] In a possible implementation, the dehumidification module, the first adsorption module, and the second adsorption module are sequentially provided with an air intake quick-connect female connector and an air intake check flow valve on the air intake pipe along the air flow direction.

[0013] In one possible implementation, the dehumidification module and the first adsorption module are provided with an outlet check valve and an outlet quick-connect female connector in sequence on the outlet pipe along the air flow direction, and the second adsorption module is provided with an outlet check valve and an outlet three-way quick-connect female connector in sequence on the outlet pipe along the air flow direction.

[0014] In a possible implementation, the air outlets of the dehumidification module and the first adsorption module are provided with life window tubes, which are used to determine whether the module's adsorption capacity for the corresponding substance is saturated, and can be used as a basis for replacing the corresponding module.

[0015] In one possible implementation, the life window tube includes a shell and a transparent window. The shell is filled with a life indicator material. The life indicator materials filled in the life window tubes in different modules are different. The life window tube of the dehumidification module is filled with a water-absorbing color-changing material, and the life window tube of the first adsorption module is filled with a carbon dioxide-absorbing color-changing material.

[0016] According to another aspect of the present disclosure, there is provided an application method of a modular polymorphic carbon-14 adsorption enrichment device, the method comprising the following steps:

[0017] Step 101, dismantle the top cover of each module, fill the corresponding functional material into each module through the loading port, and then seal the top cover;

[0018] Step 102, close the outlet check valve of each module, open the inlet check valve, and connect the pressure equipment respectively for sealing test; after the sealing test is qualified, close the inlet check valve, connect the temporary storage tank to be discharged with the dehumidification module through the inlet connection extension pipe along the air flow direction, connect the first adsorption module with the outlet connection extension pipe of the dehumidification module through the inlet connection extension pipe, and connect the second adsorption module with the outlet connection extension pipe of the first adsorption module through the inlet connection extension pipe; open the inlet check valve and outlet check valve of each module, connect the portable methane detector through the outlet three-way quick plug female connector, and discharge the waste gas in the temporary storage tank as planned;

[0019] Step 103, monitor whether the life window tubes of the dehumidification module and the first adsorption module change color. If the material in the life window tube begins to change color, the corresponding module needs to be replaced. Monitor the indication of the portable methane detector of the second adsorption module. If the indication increases significantly, the corresponding module needs to be replaced. The replaced module is unloaded through the discharge port by removing the bottom cover for subsequent processing, and the shell can be reused.

[0020] The beneficial effects of the present disclosure are as follows: the modular polymorphic carbon-14 adsorption enrichment device provided by the present disclosure can dehumidify the gas to be treated and adsorb carbon-14 carbon dioxide and carbon-14 hydrogen compounds in the gas to be treated by setting a dehumidification module, a first adsorption module and a second adsorption module. The sequential adsorption of airborne carbon-14 replaces the traditional mixed dilution method, which can effectively avoid the potential safety hazards brought by the mixed dilution method, and can also efficiently process polymorphic carbon-14, thereby effectively controlling the emission of airborne carbon-14 in nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a modular polymorphic carbon-14 adsorption enrichment device shown in an embodiment of the present disclosure.

[0022] Figure 2 It is a schematic diagram of the main structure of the module shown in an embodiment of the present disclosure.

[0023] Figure 3 It is a schematic diagram of a top cover shown in an embodiment of the present disclosure.

[0024] Figure 4 It is a schematic diagram of a life window tube shown in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] The present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Unless otherwise defined, the technical and scientific terms used in the present disclosure have the same meanings as those generally understood by those skilled in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the term "including" and any variations thereof in the present disclosure are intended to cover non-exclusive inclusions. Obviously, the embodiments described in the present disclosure are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative efforts are within the scope of protection of the present disclosure.

[0027] Reference to "embodiments" in this disclosure means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] Figure 1 is a schematic diagram of a modular polymorphic carbon-14 adsorption enrichment device shown in an embodiment of the present disclosure, such as Figure 1 As shown, the device disclosed in the present invention comprises a dehumidification module 1, a first adsorption module 2 and a second adsorption module 3 which are connected in series through a gas path in the direction of the gas flow. The dehumidification module 1 is used to dehumidify the gas to be treated, the first adsorption module 2 is used to adsorb carbon dioxide in the gas to be treated, and the second adsorption module 3 is used to adsorb hydrocarbons in the gas to be treated. A methane detector is provided at the gas outlet of the second adsorption module 3 to detect the methane content of the treated gas.

[0029] like Figure 1 As shown, the dehumidification module 1, the first adsorption module 2 and the second adsorption module 3 have the same main structure. Figure 2 is a schematic diagram of the main structure of the module shown in the embodiment of the present disclosure, such as Figure 2 As shown, the main structure includes a tank body 11, a feed port, a discharge port 13, a top cover 4, a bracket 16, an air inlet check flow valve 18, an air outlet check flow valve 7, an air inlet quick-connect female connector 19, and a handle 12.

[0030] An air inlet 17 is provided at the bottom of the tank body 11 for introducing the gas to be treated; a feed port is provided at the top of the tank body 11 for loading granular materials into the tank body 11, and the granular materials are used to adsorb the substances corresponding to the modules in which they are located, for example, the granular materials in the dehumidification module 1 are used for moisture absorption, the granular materials in the first adsorption module 2 are used for adsorbing carbon dioxide, and the granular materials in the second adsorption module 3 are used for adsorbing hydrocarbons; a discharge port 13 is provided on the side of the lower part of the tank body 11 for discharging the granular materials inside the tank body 11; the top cover 4 is used to seal the feed port of the tank body 11, and a gas outlet is provided on one side of the top cover 4, which is connected to the gas outlet pipe 6 for outputting the treated gas in the tank body 11; the bottom cover 14 is used to seal the discharge port 13. The air inlet check valve 18 is provided on the air inlet pipe 17, and the gas outlet check valve 7 is provided on the gas outlet pipe 6, which can effectively prevent the gas from flowing back.

[0031] A lower sieve plate 15 is provided inside the tank body 11 to carry the granular material filled inside the tank body 11 and ensure gas circulation. The aperture size of the sieve plate can be flexibly adjusted according to the particle size of the granular material carried. A bracket 16 is provided at the bottom of the tank body 11 to support the tank body 11. A symmetrical handle 12 is provided in the middle of the side wall of the tank body 11 to facilitate gripping and moving the tank body 11.

[0032] In one possible implementation, the air inlet pipe 17 of the first adsorption module is connected to the air outlet connecting extension pipe 10 connected to the air outlet pipe 6 of the dehumidification module through the air inlet connecting extension pipe 10, and the second adsorption module is connected to the air outlet connecting extension pipe of the first adsorption module through the air inlet connecting extension pipe.

[0033] Figure 3 is a schematic diagram of a top cover shown in an embodiment of the present disclosure, such as Figure 3 As shown, the top cover adopts an integrated design, integrating the top cover air inlet 25, the top cover air outlet 24, the aerosol filter membrane 22 and the upper sieve plate 23. The upper sieve plate 23 is used to prevent the granular material from dumping from the tank body and blocking the top cover air outlet. The aerosol filter membrane 22 is used to filter the aerosol particles carried by the granular material when the gas flows through, so as to prevent the subsequent pipelines from being blocked.

[0034] In one possible implementation, the dehumidification module 1, the first adsorption module 2 and the second adsorption module 3 are sequentially provided with an air intake quick-connect female connector 19 and an air intake check flow valve 18 on the air intake pipe 17 along the air flow direction to ensure that the air flow does not flow back into the system or leak into the environment.

[0035] In a possible implementation, the dehumidification module 1 and the first adsorption module 2 are provided with an outlet check valve 7 and an outlet quick-connect female connector in sequence on the outlet pipe 6 along the airflow direction, and the second adsorption module 3 is provided with an outlet check valve 7 and an outlet three-way quick-connect female connector 8 in sequence on the outlet pipe 6 along the airflow direction to ensure that the airflow does not flow back into the exhaust system or leak into the environment.

[0036] In a possible implementation, the air outlets of the dehumidification module 1 and the first adsorption module 2 are provided with life window tubes 9, which are used to judge whether the module's adsorption capacity for the corresponding substance is saturated, and can be used as a basis for replacing the corresponding module.

[0037] In one possible implementation, Figure 3 As shown, the life window tube includes a shell 28, a transparent window 27, and a life indicating material 28 filled inside the shell.

[0038] In one possible implementation, the life window tube 9 in different modules is filled with different life indicator materials. The life window tube 9 of the dehumidification module 1 is filled with water-absorbing and color-changing materials, such as color-changing silica gel, and the life window tube 9 of the first adsorption module 2 is filled with carbon dioxide-absorbing and color-changing materials, such as soda lime, calcium lime, etc.

[0039] In one possible implementation, see Figure 1 For the second adsorption module 3, since the adsorption of methane is physical adsorption and no chemical reaction occurs, the module life cannot be indicated by color development. Therefore, it is monitored by a portable methane detector 21. For example, the detection accuracy of the methane detector is better than 1ppm, and the detection range is between 0-20000ppm.

[0040] In a possible implementation, a method for applying a modular polymorphic carbon-14 adsorption enrichment device is provided, and the method includes the following steps.

[0041] Step 101, dismantle the top cover of each module, fill the corresponding functional material into each module through the loading port, and then seal the top cover.

[0042] Step 102, close the outlet check valve of each module, open the inlet check valve, and connect the pressure equipment respectively for sealing test; after the sealing test is qualified, close the inlet check valve, and connect the temporary storage tank to be discharged with the dehumidification module through the inlet connecting extension pipe along the air flow direction, connect the first adsorption module with the dehumidification module outlet connecting extension pipe through the inlet connecting extension pipe, and connect the second adsorption module with the first adsorption module outlet connecting extension pipe through the inlet connecting extension pipe; open the inlet check valve and outlet check valve of each module, connect the portable methane detector through the outlet three-way quick plug female connector, and discharge the waste gas in the temporary storage tank as planned.

[0043] Step 103, monitor whether the life window tubes of the dehumidification module and the first adsorption module change color. If the material in the life window tube begins to change color, the corresponding module needs to be replaced. Monitor the indication of the portable methane detector of the second adsorption module. If the indication increases significantly, the corresponding module needs to be replaced. The replaced module is unloaded through the discharge port by removing the bottom cover for subsequent processing, and the shell can be reused.

[0044] The description of the above-mentioned device has been explained in detail in the description of the above-mentioned method, and will not be repeated here.

[0045] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A modular polymorphic carbon-14 adsorption enrichment device, characterized in that: The device comprises: a dehumidification module, a first adsorption module and a second adsorption module; The dehumidification module is used to dehumidify the gas to be treated, the first adsorption module is used to adsorb carbon dioxide in the gas to be treated, and the second adsorption module is used to adsorb hydrocarbons in the gas to be treated; a methane detector is provided at the gas outlet of the second adsorption module to detect the methane content of the treated gas; The dehumidification module, the first adsorption module and the second adsorption module have a consistent main structure, which includes a tank body, a feed port, a discharge port, a top cover and a bracket; An air inlet pipe is arranged at the bottom of the tank body for introducing the gas to be treated; a feed port is arranged at the top of the tank body for loading granular material into the tank body, and the granular material is used to adsorb the corresponding adsorbed substance of the module; a discharge port is arranged on the lower side of the tank body for discharging the granular material inside the tank body; the top cover is used to seal the feed port of the tank body, and an air outlet is arranged on one side of the top cover, which is connected to the air outlet pipe for outputting the treated gas in the tank body; the bottom cover is used to seal the discharge port.

2. The device according to claim 1, characterized in that The air inlet pipe is provided with an air inlet check flow valve, and the air outlet pipe is provided with an air outlet check flow valve.

3. The device according to claim 1, characterized in that A lower sieve plate is arranged inside the tank body for carrying the granular material filled inside the tank body. The device is provided with a plurality of lower sieve plates, and the apertures of the lower sieve plates are different from each other.

4. The device according to claim 1, characterized in that A symmetrical handle is arranged in the middle of the side wall of the tank body.

5. The device according to claim 1, characterized in that The top cover adopts an integrated design, integrating the top cover air inlet, top cover air outlet, aerosol filter membrane and upper sieve plate. The upper sieve plate is used to prevent the granular material from dumping from the tank and blocking the top cover air outlet. The aerosol filter membrane is used to filter the aerosol particles carried by the granular material when the gas flows through, to prevent blockage of subsequent pipelines.

6. The device according to claim 1, characterized in that The dehumidification module, the first adsorption module and the second adsorption module are sequentially provided with an air intake quick-connect female connector and an air intake check flow valve on the air intake pipe along the air flow direction.

7. The device according to claim 1, characterized in that The dehumidification module and the first adsorption module are provided with an outlet check flow valve and an outlet quick-connect female connector in sequence on the outlet pipe along the airflow direction; the second adsorption module is provided with an outlet check flow valve and an outlet three-way quick-connect female connector in sequence on the outlet pipe along the airflow direction.

8. The device according to claim 1, characterized in that The air outlets of the dehumidification module and the first adsorption module are provided with life window tubes, which are used to judge whether the module's adsorption capacity for the corresponding substance is saturated, and can be used as a basis for replacing the corresponding module.

9. The device according to claim 1, characterized in that The life window tube includes a shell and a transparent window. The shell is filled with a life indicator material. The life indicator materials filled in the life window tubes in different modules are different. The life window tube of the dehumidification module is filled with a water-absorbing color-changing material, and the life window tube of the first adsorption module is filled with a carbon dioxide-absorbing color-changing material.

10. An application method of a modular polymorphic carbon-14 adsorption enrichment device, characterized in that: The method comprises the following steps: Step 101, dismantle the top cover of each module, fill the corresponding functional material into each module through the loading port, and then seal the top cover; Step 102, close the outlet check valve of each module, open the inlet check valve, and connect the pressure equipment respectively for sealing test; after the sealing test is qualified, close the inlet check valve, connect the temporary storage tank to be discharged with the dehumidification module through the inlet connection extension pipe along the air flow direction, connect the first adsorption module with the outlet connection extension pipe of the dehumidification module through the inlet connection extension pipe, and connect the second adsorption module with the outlet connection extension pipe of the first adsorption module through the inlet connection extension pipe; open the inlet check valve and outlet check valve of each module, connect the portable methane detector through the outlet three-way quick plug female connector, and discharge the waste gas in the temporary storage tank as planned; Step 103, monitor whether the life window tubes of the dehumidification module and the first adsorption module change color. If the material in the life window tube begins to change color, the corresponding module needs to be replaced. Monitor the indication of the portable methane detector of the second adsorption module. If the indication increases significantly, the corresponding module needs to be replaced. The replaced module is unloaded through the discharge port by removing the bottom cover for subsequent processing, and the shell can be reused.

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