Self-circulation Deep Purification Device for Nuclear Power Exhaust System

Abstract

The present invention provides a self-circulating deep purification device for a nuclear power exhaust system, which relates to the technical field of nuclear power exhaust. It includes a pretreatment module, which is connected and arranged at the exhaust outlet of the secondary loop of the nuclear power plant. The main purification module is fixedly connected downstream of the pretreatment module to deeply purify the gas roughly treated by the pretreatment module. The self-circulation module is fixedly connected to the clean gas outlet of the main purification module, and the gas purified by the main purification module is re-introduced into the pretreatment module through the self-circulation module. The waste gas treatment module is fixedly connected to the waste gas outlet of the purification module to collect and treat the unpurified waste gas. By re-introducing the purified gas into the pretreatment module through the self-circulation module, the gas flow rate in the overall device is increased, and there is no need to provide external power. The present invention solves the problems of insufficient deep purification, inability to perform self-circulation, and complex operation and high maintenance cost in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power exhaust technology, and particularly to a self-circulating deep purification device for a nuclear power exhaust system. Background Art

[0002] With the continuous development of the nuclear power field, the operation safety and environmental friendliness of nuclear power equipment have become important concerns. Especially for the purification technology of the nuclear power exhaust system, it is directly related to the emission of radioactive substances and the control of environmental pollution. Although the existing purification devices for nuclear power exhaust systems have achieved the removal of radioactive particles to a certain extent, there are still deficiencies in in-depth purification and system self-circulation.

[0003] After retrieval, a patent for invention of a supercritical fluid particle removal device and a supercritical fluid purification method with the publication number (CN109939520B) realizes the strong removal of particles in supercritical fluid through the combined action of a filter pipe section and a deposition pipe section, and can remove radioactive and non-radioactive particles with a particle size less than 2.5 nanometers. However, the above-mentioned published patent for invention cannot effectively handle smaller particles, so the purification depth is limited. At the same time, it lacks self-circulation ability and mainly relies on external power devices and filtration systems, resulting in complex operation and high maintenance costs during filtration. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-circulating deep purification device for a nuclear power exhaust system, which solves the problems of insufficient in-depth purification, inability to perform self-circulation, complex operation and high maintenance costs in the prior art.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions:

[0006] A self-circulating deep purification device for a nuclear power exhaust system, comprising:

[0007] A pretreatment module, which is connected and arranged at the exhaust outlet of the secondary loop of the nuclear power plant;

[0008] A main purification module, which is fixedly connected downstream of the pretreatment module and deeply purifies the gas roughly treated by the pretreatment module;

[0009] A self-circulation module, which is fixedly connected to the clean gas outlet of the main purification module, and the gas purified by the main purification module is re-introduced into the pretreatment module through the self-circulation module;

[0010] An exhaust gas treatment module, which is fixedly connected to the exhaust gas outlet of the purification module, collects and treats the unpurified exhaust gas through the exhaust gas treatment module, and converts harmful gases into harmless substances for emission;

[0011] Among them, the purified gas is re-introduced into the pretreatment module through the self-circulation module, thereby increasing the gas flow rate in the overall device without the need for external power supply.

[0012] According to the nuclear power exhaust gas system self-circulation deep purification device provided by the present invention: The pretreatment module includes:

[0013] A coarse filter, which is connected to the exhaust outlet of the secondary loop of the nuclear power plant, and thereby introduces exhaust gas into the coarse filter;

[0014] A sedimentation chamber, which is arranged downstream of the coarse filter and is connected to the coarse filter;

[0015] A heat exchanger, which is arranged downstream of the sedimentation chamber and is connected to the sedimentation chamber;

[0016] Among them, by connecting the coarse filter, the sedimentation chamber and the heat exchanger in sequence, the exhaust gas can be gradually introduced into each purification chamber in sequence, and the exhaust gas is deeply filtered and purified in sequence.

[0017] According to the nuclear power exhaust gas system self-circulation deep purification device provided by the present invention: The coarse filter includes:

[0018] An inlet pipe, which is connected to the exhaust outlet of the secondary loop of the nuclear power plant;

[0019] A filter head, which is integrally formed inside one end of the inlet pipe, and the filter head is wrapped by the inlet pipe;

[0020] Among them, after the filter head is wrapped by one end of the inlet pipe, a cavity is formed between the filter head and the inner wall of the inlet pipe, and one end of the filter head is closed.

[0021] According to the nuclear power exhaust gas system self-circulation deep purification device provided by the present invention: The sedimentation chamber includes:

[0022] A sedimentation box body, the side wall of which is connected to the coarse filter for inputting the coarsely filtered gas into the sedimentation box body;

[0023] A plurality of sedimentation plates, which are inclined and fixed inside the sedimentation box body, and the plurality of sedimentation plates are arranged in multiple layers in sequence;

[0024] Among them, the sedimentation plates are used to move the introduced gas downward along the sedimentation plates by gravity, and adsorb the impurities in the gas on the sedimentation plates during the movement.

[0025] The self-circulating deep purification device for the nuclear power exhaust system provided by the present invention: The heat exchanger includes:

[0026] A heat exchange box, which is connected and arranged on the side of the sedimentation chamber away from the coarse filter;

[0027] A plurality of heat exchange plates, which are arranged inside the heat exchange box, and the plurality of heat exchange plates are arranged in multiple layers along the height direction of the heat exchange box;

[0028] Wherein, a uniform gap is formed between each layer of the heat exchange plates, and the gas passes through the gap and through the heat exchange plates to reduce the temperature of the gas.

[0029] The self-circulating deep purification device for the nuclear power exhaust system provided by the present invention: The main purification module includes:

[0030] A multi-stage filtering component, which is connected and arranged at one end of the pretreatment module and is used for deeply filtering the gas roughly filtered in the pretreatment module;

[0031] A deep purification component, which is connected and arranged at the end of the multi-stage filtering component away from the pretreatment module;

[0032] Wherein, the multi-stage filtering component filters the pretreated gas again through multiple stages to remove finer impurities in the gas, and at the same time, the deep purification component deeply separates and filters the gas filtered by the multi-stage filtering component again.

[0033] The self-circulating deep purification device for the nuclear power exhaust system provided by the present invention: The multi-stage filtering component includes:

[0034] A first filter, which is connected to the pretreatment module and passes the roughly filtered gas into the first filter. A first filter cartridge is arranged inside the first filter, and the first filter cartridge is integrally formed with the first filter;

[0035] A second filter, which is arranged at the end of the first filter away from the pretreatment module, and filter meshes are arranged at both ends inside the second filter;

[0036] A third filter, which is arranged at the end of the second filter away from the first filter, and a second filter cartridge is integrally formed corresponding to the second filter inside the third filter;

[0037] Wherein, the pore diameters of the first filter cartridge, the filter meshes and the second filter cartridge decrease in sequence for filtering particulate matters of different sizes, and one end of the first filter cartridge and the second filter cartridge is closed.

[0038] The deep purification device for self-circulation of the nuclear power exhaust system provided by the present invention: The deep purification component includes:

[0039] A deep purification box, which is connected to the gas outlet end of the third filter;

[0040] Multiple adsorption layers, which are arranged inside the deep purification box and are used for adsorbing radioactive gases in the introduced gas;

[0041] A plasma reaction chamber, which is arranged below the adsorption layer inside the deep purification box;

[0042] A radio frequency power supply, which penetrates the side wall of the deep purification box and extends into the plasma reaction chamber;

[0043] A separator, which is fixedly arranged at the bottom of the deep purification box and is used for separating the gas separated by the plasma technology;

[0044] Among them, multiple adsorption layers are filled with multiple adsorbents. The radioactive gases are adsorbed through the multiple adsorption layers. At the same time, the radio frequency power supply separates the gas, and the purified gas and harmful gas are separately output through the separator.

[0045] The self-circulation module of the deep purification device for the nuclear power exhaust system provided by the present invention: The self-circulation module includes:

[0046] A collection box, which is connected and arranged on one side of the bottom of the deep purification box and is used for collecting the purified gas;

[0047] A fan, which is connected to the collection box and is used for pumping out the gas collected by the collection box;

[0048] A return pipe, the first end of which is connected to the fan, and the second end of which is connected to the pretreatment module;

[0049] Among them, the fan pumps out the purified gas and transports it back to the pretreatment module through the return pipe to realize the recycling of the gas.

[0050] The waste gas treatment module of the deep purification device for the nuclear power exhaust system provided by the present invention: The waste gas treatment module includes:

[0051] A waste gas collector, which is connected and arranged on the side of the bottom of the deep purification box far from the multi-stage filtration component and is used for collecting the unpurified waste gas;

[0052] A high-efficiency separator, which is arranged on the waste gas collector and is used for discharging the purified gas;

[0053] A catalytic bed, which is arranged on the inner wall of the high-efficiency separator, and a catalyst layer is filled in the catalytic bed;

[0054] An outlet, which penetrates through the bottom of the waste gas collector and is used for discharging the substances after the catalytic reaction;

[0055] An exhaust pipe, which is arranged on the high-efficiency separator and is used for discharging the purified clean gas;

[0056] Wherein, the waste gas collector and the high-efficiency separator are integrally formed, and the purified gas after the reaction is discharged through the high-efficiency separator.

[0057] In summary, the beneficial technical effects of the present invention are as follows:

[0058] Through the provided pretreatment module and main purification module, various pollutants including fine radioactive particles can be effectively purified, ensuring that the concentration of radioactive substances in the exhaust gas is reduced to a safe level. At the same time, through the provided self-circulation system, the purified gas can be recycled again, thereby greatly improving the purification efficiency and better reducing the operation cost of waste gas purification. Secondly, the provided waste gas treatment module reacts with the unpurified gas after purification, and then discharges the generated clean gas into the air, so as to realize the full-process control from the source to the emission through the organic combination of exhaust gas purification and waste treatment, better ensuring the safety and friendliness of the discharged gas, and solving the problems of insufficient deep purification, inability to self-circulate and high maintenance cost.

[0059] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0060] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0061] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0062] Figure 2 It is a schematic diagram of the overall rear view structure of an embodiment of the present invention;

[0063] Figure 3 It is a cross-sectional view of the structure of the coarse filter of an embodiment of the present invention;

[0064] Figure 4 is a cross-sectional plan view of the coarse filter in an embodiment of the present invention;

[0065] Figure 5 is a cross-sectional plan view of the sedimentation chamber in an embodiment of the present invention;

[0066] Figure 6 is a cross-sectional structural view of the multi-stage filtering component in an embodiment of the present invention;

[0067] Figure 7 is a cross-sectional plan view of the multi-stage filtering component in an embodiment of the present invention;

[0068] Figure 8 is a cross-sectional plan view of the deep purification component in an embodiment of the present invention;

[0069] Figure 9 is a cross-sectional plan view of the exhaust gas treatment module in an embodiment of the present invention.

[0070] Reference numerals:

[0071] 10, pretreatment module; 11, coarse filter; 12, sedimentation chamber; 13, heat exchanger;

[0072] 111, inlet pipe; 112, filter head;

[0073] 121, sedimentation box body; 122, sedimentation plate;

[0074] 131, heat exchange box; 132, heat exchange plate;

[0075] 20, main purification module; 21, multi-stage filtering component; 22, deep purification component;

[0076] 211, first filter; 212, second filter; 213, first filter cartridge; 214, filter mesh; 215, third filter; 216, second filter cartridge;

[0077] 221, deep purification box; 222, adsorption layer; 223, plasma reaction chamber; 224, radio frequency power supply; 225, separator;

[0078] 30, self-circulation module; 31, collection box; 32, fan; 33, return pipe;

[0079] 40, exhaust gas treatment module; 41, exhaust gas collector; 42, high-efficiency separator; 43, catalytic bed; 44, discharge port; 421, exhaust pipe. Detailed implementation manners

[0080] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0081] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0082] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0083] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0084] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0085] The following combines Figures 1-9 the embodiments shown to describe the technical solution of the present invention:

[0086] A self-circulating deep purification device for a nuclear power exhaust system includes a pretreatment module 10, which is connected and arranged at the exhaust outlet 44 of the secondary circuit waste gas of a nuclear power plant. The main purification module 20 is fixedly connected downstream of the pretreatment module 10 to deeply purify the gas roughly treated by the pretreatment module 10. The self-circulation module 30 is fixedly connected to the clean gas outlet of the main purification module 20. Through the self-circulation module 30, the gas purified by the main purification module 20 is re-introduced into the pretreatment module 10. The waste gas treatment module 40 is fixedly connected to the waste gas outlet of the purification module. Through the waste gas treatment module 40, the unpurified waste gas is collected and re-treated to convert harmful gases into harmless substances for emission. Among them, through the self-circulation module 30, the purified gas is re-introduced into the pretreatment module 10, thereby increasing the gas flow rate in the overall device and eliminating the need for external power supply.

[0087] It can be understood that the pretreatment module 10 is connected to the exhaust outlet 44 of the secondary loop of the nuclear power plant, and the radioactive exhaust gas generated by the nuclear reaction is introduced into the pretreatment module 10 for pretreatment of the exhaust gas to filter out some larger impurities. The pretreatment module 10 can be an initially filtering device, such as a double-layer sleeve-type filter cartridge with a gradually decreasing filtering aperture. An adsorption filtering chamber can also be selected to perform initial adsorption filtering on the introduced exhaust gas. The filtering of the filter cartridge and the adsorption filtering include, but are not limited to, filtering with a filter mesh and adsorption with activated carbon. The above are optional methods for the initial treatment of the pretreatment module 10, and no limitations are imposed in this embodiment. After the gas is treated, it is introduced into the main purification module 20, and the main purification module 20 performs deep filtration and purification on the radioactive gas, separating the radioactive impurities and radioactive gas in the exhaust gas. That is, the separated purified gas is sent back to the pretreatment module 10 through the self-circulation module 30 again, enabling the purified gas to be recycled again, thereby improving the purification efficiency of the device. The self-circulation module 30 can select a pumping method or a negative pressure method to introduce the separated and purified gas into the pretreatment module. The above treatment method is an optional method in this embodiment and no limitations are imposed. Moreover, the introduction of the purified gas better accelerates the circulation of the exhaust gas, thereby better reducing the operating cost during exhaust gas purification. At the same time, the exhaust gas treatment module 40 is provided to collect the unpurified gas. The exhaust gas treatment module 40 performs a catalytic reaction on the still harmful gas after treatment or dissolves it in a liquid. Catalytic reaction and dissolution in a liquid are optional methods for treating unpurified exhaust gas, and no limitations are imposed in this embodiment. Then, after the reaction treatment by the exhaust gas treatment module 40, the clean gas is discharged, enabling the discharged gas to reach the safe emission level and thus being better discharged into the atmosphere.

[0088] The self-circulation deep purification device for the nuclear power exhaust system provided by the embodiment of the present invention sets the pretreatment module 10 in two stages. The first stage is the coarse filtration stage, which is installed in the secondary loop exhaust outlet 44 of the nuclear power plant. The coarse filtration stage is a tubular structure, with flanges connected at both ends and connected by the flanges during assembly. The second stage is the precipitation stage, where a precipitation device is set. An inlet is set on the precipitation device, and it is connected to the coarse filtration of the first stage through the inlet on the precipitation device. Then, the gas after coarse filtration is precipitated through the precipitation device to remove impurities in the exhaust gas again. At the same time, a heat exchange device is penetrated at the bottom of the precipitation device, so as to cool the precipitated gas and input it into the main purification module 20 again. Through the main purification module 20, the impurities and radioactive gases in the gas are deeply filtered and separated, that is, the exhaust gas and the purified gas are separated. Secondly, the separated purified gas is introduced into the coarse filtration stage again, so that the purified gas is recycled again, thereby improving the purification efficiency of the device. The unpurified exhaust gas reacts and collects harmful substances through catalytic reaction, and finally the clean gas is discharged, making the discharged gas safer.

[0089] According to the self-circulation deep purification device for the nuclear power exhaust system provided by the embodiment of the present invention, the pretreatment module 10 includes a coarse filter 11, the coarse filter 11 is connected to the secondary loop exhaust outlet 44 of the nuclear power plant, and then the exhaust gas is introduced into the coarse filter 11, a sedimentation chamber 12, the sedimentation chamber 12 is arranged downstream of the coarse filter 11 and connected to the coarse filter 11, and a heat exchanger 13, the heat exchanger 13 is arranged downstream of the sedimentation chamber 12 and connected to the sedimentation chamber 12. Among them, by connecting the coarse filter 11, the sedimentation chamber 12 and the heat exchanger 13 in sequence, the exhaust gas can be gradually introduced into each purification chamber in turn, and the exhaust gas is deeply filtered and purified in turn.

[0090]

[0091]

[0092] Table 1 is the distribution map of nuclear power exhaust gas

[0093] Figure 1 and Figure 2A self - circulating deep purification device for a nuclear power exhaust system is implemented. The pretreatment module 10 is formed by combining a coarse filter 11, a sedimentation chamber 12, and a heat exchanger 13. At the same time, the coarse filter 11 is connected to the exhaust outlet 44 of the secondary loop of the nuclear power plant. The radioactive gas introduced is roughly filtered by the coarse filter 11 to filter out some substances with larger particles. Subsequently, the roughly filtered gas is sent into the sedimentation chamber 12 again for sedimentation filtration. During sedimentation filtration, larger particulate matters are further removed by gravity sedimentation. Then, the gas after sedimentation filtration is discharged through the heat exchanger 13. During the discharge process, the temperature of the gas is reduced by the heat exchanger 13, so that after entering the subsequent main purification module 20, it can be more deeply purified by the main purification module 20, thereby improving the subsequent purification efficiency.

[0094] According to the self - circulating deep purification device for a nuclear power exhaust system provided by the embodiment of the present invention, the coarse filter 11 includes an inlet pipe 111, the inlet pipe 111 is connected to the exhaust outlet 44 of the secondary loop of the nuclear power plant, and a filter head 112. The filter head 112 is integrally formed inside one end of the inlet pipe 111, and the filter head 112 is wrapped by the inlet pipe 111. Among them, after the filter head 112 is wrapped by one end of the inlet pipe 111, a cavity is formed between the filter head 112 and the inner wall of the inlet pipe 111, and one end of the filter head 112 is closed.

[0095] Figure 3 and Figure 4 A self - circulating deep purification device for a nuclear power exhaust system is implemented. The coarse filter 11 is formed by combining an inlet pipe 111 and a filter head 112. At the same time, flanges are provided at both ends of the inlet pipe 111, and it is connected to the exhaust outlet 44 of the secondary loop of the nuclear power plant through the flanges. Moreover, the filter head 112 is arranged in the inlet pipe 111 and integrally formed and connected with the inlet pipe 111, and one end of the filter head 112 is closed, so that after the gas enters, it can be better filtered by the filter head 112, and particulate matters with larger diameters are filtered. Since the filter head 112 is arranged inside the inlet pipe 111, a cavity is formed between the filter head 112 and the inner wall of the inlet pipe 111 to filter the gas, and the filtered gas is sent to the next process.

[0096] According to the self - circulating deep purification device for a nuclear power exhaust system provided by the embodiment of the present invention, the sedimentation chamber 12 includes a sedimentation box body 121. The side wall of the sedimentation box body 121 is connected to the coarse filter 11 for inputting the roughly filtered gas into the sedimentation box body 121. A plurality of sedimentation plates 122 are fixedly arranged obliquely inside the sedimentation box body 121. The plurality of sedimentation plates 122 are distributed in multiple layers in sequence. Among them, the sedimentation plates 122 are used to make the gas introduced move downward along the sedimentation plates 122 by gravity, and impurities in the gas are adsorbed on the sedimentation plates 122 during the movement.

[0097] Figure 5 A self-circulating deep purification device for a nuclear power exhaust system is implemented in the present invention. The sedimentation chamber 12 is formed by a sedimentation box body 121 and a sedimentation plate 122. The sedimentation box body 121 is in a rectangular shape. A sedimentation cavity is arranged inside the sedimentation box. Sedimentation plates 122 are evenly arranged in the sedimentation cavity. The sedimentation plates 122 are inclined when they are set, and are laid vertically downward in the sedimentation cavity. The distance between each sedimentation plate 122 is 200 mm. In order to make the sedimentation and filtration effect of the sedimentation plate 122 better, an adhesive layer is coated on the surface of the sedimentation plate 122, which is used to stick to and absorb larger impurities in the air, so that when the gas passes through the sedimentation plate 122, gravity can better stick the larger particles to the sedimentation plate 122, thereby coarsely filtering the exhaust gas again, and then facilitating deep purification treatment.

[0098] According to the self-circulation deep purification device of the nuclear power exhaust system provided by an embodiment of the present invention, the heat exchanger 13 includes a heat exchange box 131, which is connected to the sedimentation chamber 12 and arranged on the side away from the coarse filter 11, and a plurality of heat exchange plates 132. The plurality of heat exchange plates 132 are arranged inside the heat exchange box 131, and the plurality of heat exchange plates 132 are arranged in multiple layers along the height direction of the heat exchange box 131, wherein uniform gaps are formed between each layer of heat exchange plates 132, and the gas passes through the heat exchange plates 132 through the gaps to reduce the gas temperature.

[0099] Figure 5 A self-circulating deep purification device for a nuclear power exhaust system is implemented in the invention. The heat exchanger 13 is formed by a combination of a heat exchange box 131 and a heat exchange plate 132. The heat exchange box 131 is connected to the bottom of the sedimentation chamber 12 on the side away from the coarse filter 11, connecting the sedimentation box. At the same time, multiple layers of heat exchange plates 132 are evenly arranged inside the heat exchange box 131, and the heat exchange plates 132 are flatly laid in the heat exchange box 131. The temperature of the air entering the heat exchange box 131 is reduced by the heat exchange plates 132, and the heat exchange efficiency of the heat exchange plates 132 is 90%. Since the overall temperature of the gas discharged from the reaction in the nuclear power plant is relatively high, the gas temperature needs to be reduced before some gases in the mixed exhaust gas can be formed, such as xenon (Xe) and krypton (Kr) in the mixed exhaust gas, so as to facilitate the subsequent main purification module 20 to deeply purify the gas, thereby improving the purification efficiency of the main purification module 20 during deep purification.

[0100] According to the nuclear power exhaust system self-circulation deep purification device provided by the embodiments of the present invention, the main purification module 20 includes a multi-stage filtering component 21, which is connected in series at one end of the pretreatment module 10 and is used to deeply filter the gas roughly filtered in the pretreatment module 10, and a deep purification component 22, which is connected in series at the end of the multi-stage filtering component 21 away from the pretreatment module 10. Among them, the multi-stage filtering component 21 filters the pretreated gas again through multiple stages to remove finer impurities in the gas, and at the same time, the deep purification component 22 performs deep separation and filtration on the gas filtered by the multi-stage filtering component 21 again.

[0101] Figure 1 and Figure 2 A nuclear power exhaust system self-circulation deep purification device is implemented, and the main purification module 20 is formed by combining a multi-stage filtering component 21 and a deep purification component 22. The multi-stage filtering component 21 is connected to the sedimentation tank in the pretreatment module 10, and the treated gas is introduced into the multi-stage filtering component 21 through the heat exchange tank 131 on the sedimentation tank. Then, the multi-stage filtering component 21 performs deep purification treatment on the gas. At the same time, the deep purification component 22 is connected to the other end of the multi-stage filtering component 21, and the gas filtered by the multi-stage filtering component 21 is introduced into the deep purification component 22 again. The deep purification component 22 purifies and separates the radioactive gas better, and then separates out clean gas. At the same time, the multi-stage filtering component 21 and the deep purification component 22 can better filter smaller particulate matters in the gas, and then separate out clean gas.

[0102] According to the nuclear power exhaust system self-circulation deep purification device provided by the embodiments of the present invention, the multi-stage filtering component 21 includes a first filter 211, which is connected to the pretreatment module 10 and introduces the roughly filtered gas into the first filter 211. A first filter cartridge 213 is arranged inside the first filter 211, and the first filter cartridge 213 is integrally formed with the first filter 211. A second filter 212 is arranged at the end of the first filter 211 away from the pretreatment module 10. Filter meshes 214 are arranged at both ends inside the second filter 212. A third filter 215 is arranged at the end of the second filter 212 away from the first filter 211. A second filter cartridge 216 is integrally formed inside the third filter 215 corresponding to the second filter 212. Among them, the pore diameters of the first filter cartridge 213, the filter meshes 214, and the second filter cartridge 216 decrease in sequence for filtering particulate matters of different sizes, and one ends of the first filter cartridge 213 and the second filter cartridge 216 are closed.

[0103] Figure 6 and Figure 7A self-circulating deep purification device for a nuclear power exhaust system is implemented. The multi-stage filtering component 21 is formed by combining a first filter 211, a second filter 212, and a third filter 215. The first filter 211 is connected to the heat exchange box 131 at the bottom of the sedimentation tank in the pretreatment module 10, so that the gas cooled after coarse filtration is introduced into the first filter 211. At the same time, a first filter cartridge 213 is provided inside the first filter 211. The first filter cartridge 213 is integrally formed with the inner wall of the first filter 211, and a gap is formed between the first filter cartridge 213 and the first filter 211. The second filter 212 is connected to the outlet end of the first filter 211, and filter meshes 214 are provided at both ends of the second filter 212. The filter meshes 214 seal and close both ends of the second filter 212. A high-efficiency filter mesh 214 is connected and provided at the other end of the second filter 212, and a second filter cartridge 216 is provided inside the high-efficiency filter mesh 214. The second filter cartridge 216 is similar in structure to the first filter cartridge 213, and is a structure with one end open and one end closed. Thus, the second filter cartridge 216 is integrally formed on the third filter 215. After the gas passes through the multi-stage filtering component 21, due to the presence of multiple filters and different filter pore sizes for each filter, the filter pore size of the multi-stage filtering component 21 gradually decreases from primary effect to high efficiency, and then gradually filters finer impurities in the air, making the overall filtering effect better and achieving deep filtration.

[0104] According to the self-circulating deep purification device for a nuclear power exhaust system provided by the embodiment of the present invention, the deep purification component 22 includes a deep purification box 221, the deep purification box 221 is connected to the gas outlet end of the third filter 215, a multi-layer adsorption layer 222, the multi-layer adsorption layer 222 is provided inside the deep purification box 221 for adsorbing radioactive gas in the introduced gas, a plasma reaction chamber 223, the plasma reaction chamber 223 is provided below the adsorption layer 222 inside the deep purification box 221, a radio frequency power supply 224, the radio frequency power supply 224 penetrates the side wall of the deep purification box 221 and extends into the plasma reaction chamber 223, and a separator 225, the separator 225 is fixedly provided at the bottom of the deep purification box 221 for separating the gas separated by plasma technology. Among them, the multi-layer adsorption layer 222 is filled with a multi-layer adsorbent, the radioactive gas is adsorbed through the multi-layer adsorption layer 222, at the same time, the radio frequency power supply 224 separates the gas, and the purified gas and harmful gas are separately output through the separator 225.

[0105] Figure 8A self-circulating deep purification device for a nuclear power exhaust system is implemented in the invention. The deep purification component 22 is composed of a deep purification box 221, an adsorption layer 222, a plasma reaction chamber 223, a radio frequency power supply 224 and a separator 225. The deep purification box 221 is connected to the outlet end of the third filter 215, and the filtered gas in the third filter 215 is passed into the deep purification box 221, so that the gas is better filtered and separated by the deep purification box 221, that is, a multi-layer adsorption layer 222 is set in the deep purification box 221, and the multi-layer adsorption layer 222 is formed by a combination of an activated carbon layer and a molecular sieve layer. This adsorption layer 222 is not limited to these two adsorbents, and other adsorbents such as resin can also be used. At the same time, the total thickness of the multi-layer adsorption layer 222 formed by the combination of molecular sieve and activated carbon is 100 mm, and then through The adsorption layer 222 adsorbs radioactive substances in the radioactive gas, and at the same time adsorbs and ionizes xenon (Xe), krypton (Kr) and radioactive aerosols (such as tiny particles of radioactive nuclides such as iodine-131 and cesium-137). They are first adsorbed by the activated carbon layer or molecular sieve layer of the adsorption layer, and those that cannot be adsorbed are decomposed by ionization. A plasma reaction chamber 223 is set at the bottom end of the deep purification box 221. A radio frequency power supply 224 is inserted horizontally through the side wall of the deep purification box 221 in the plasma reaction chamber 223. The magnetic field generated by the radio frequency power supply 224 is used to separate the ions in the gas, so that harmful gases and harmless gases are separated. The separator 225 set at the bottom end of the deep purification box outputs the harmful and harmless gases separately, thereby separating the clean gas.

[0106] According to the self-circulation deep purification device of the nuclear power exhaust system provided by an embodiment of the present invention, the self-circulation module 30 includes a collecting box 31, which is connected and arranged on the bottom side of the deep purification box 221, for collecting the purified gas, a fan 32, which is connected and arranged on the collecting box 31, for extracting the gas collected by the collecting box 31, a return pipe 33, the first end of the return pipe 33 is connected to the fan 32, and the second end of the return pipe 33 is connected to the pretreatment module 10, wherein the fan 32 extracts the purified gas and transports it to the pretreatment module 10 again through the return pipe 33, thereby realizing the recycling and reuse of the gas.

[0107] Figure 1 and Figure 2A self-circulation deep purification device for a nuclear power exhaust system is implemented. The self-circulation module 30 is formed by combining a collection tank 31, a fan 32, and a return pipe 33. The collection tank 31 is connected to the side wall of the deep purification tank and is connected to the clean gas discharge port 44 of the separator 225, and is used to collect the clean gas separated from the deep purification tank. The fan 32 is arranged on the top of the collection tank 31, and the other end of the fan 32 is connected to the return pipe 33. The other end of the return pipe 33 is extended and connected to the coarse filter 11 on the pretreatment module 10. Then, the separated clean gas is extracted from the collection tank 31 by the fan 32 and transported along the return pipe 33 to the coarse filter 11, thereby realizing the self-circulation of the gas and making the gas filtration effect better.

[0108] According to the self-circulation deep purification device for a nuclear power exhaust system provided by an embodiment of the present invention, the waste gas treatment module 40 includes a waste gas collector 41, which is connected to the bottom of the deep purification tank 221 on the side far from the multi-stage filtration component 21 and is used to collect the unpurified waste gas; a high-efficiency separator 42, which is arranged on the waste gas collector 41 and is used to discharge the purified gas; a catalytic bed 43, which is arranged on the inner wall of the high-efficiency separator 42, and a catalyst layer is filled in the catalytic bed 43; a discharge port 44, which penetrates through the bottom of the waste gas collector 41 and is used to discharge the substances after the catalytic reaction; an exhaust pipe 421, which is arranged on the high-efficiency separator 42 and is used to discharge the purified clean gas after catalysis. Among them, the waste gas collector 41 and the high-efficiency separator 42 are integrally formed, and the gas after reaction purification is discharged through the high-efficiency separator 42.

[0109] Figure 1 and Figure 9 A self-circulation deep purification device for a nuclear power exhaust system is implemented. The waste gas treatment module 40 is formed by combining a waste gas collector 41, a high-efficiency separator 42, a catalytic bed 43, and a discharge port 44. The waste gas collector 41 is connected to the unpurified gas outlet end of the separator 225 at the bottom of the deep purification tank 221 to collect the unpurified gas. At the same time, a high-efficiency separator 42 is fixedly arranged on the top of the waste gas collector 41, a catalytic bed 43 is arranged between the high-efficiency separator 42 and the waste gas collector 41, and a catalyst layer is filled in the catalytic bed 43. The catalytic substance used in the catalyst layer is a platinum-palladium catalyst. The gas collected in the waste gas collector 41 is subjected to a catalytic reaction to convert harmful gases into harmless substances. The generated harmless gas is discharged from the exhaust pipe 421 along the inner wall of the high-efficiency separator 42, and the exhaust pipe 421 is connected to the exhaust passage of the nuclear power plant, so that the discharged gas is clean and pollution-free. The harmless substances after reaction conversion are discharged and collected through the discharge port 44, so that the discharged air more meets the emission requirements, and at the same time, the safety and environmental protection of gas emission are ensured.

[0110] Usage process:

[0111] During use, install the overall device at the exhaust outlet 44 of the secondary loop of the nuclear power plant, connect the device to the exhaust outlet 44, so as to introduce the waste gas into the device. Through the pretreatment module 10 on the device, the gas is roughly processed, large particles are filtered in advance, and at the same time the gas is cooled and then introduced into the main purification module 20. Through the main purification module 20, the gas is deeply filtered and purified, some fine particles in the gas are filtered, and at the same time radioactive substances are adsorbed. Then the gas is separated, the harmful gas and the harmless clean gas are separated and transported in different directions. The harmful gas is sent into the waste gas collector 41 through the separator 225, while the harmless clean gas is sent into the collection box 31 through the separator 225. The harmless clean gas is transported to the coarse filter 11 in the pretreatment module 10 through the fan 32 and the return pipe 33, realizing the self-circulation of the filtered gas, thereby improving the gas filtration efficiency. The separated harmful gas is collected through the waste gas collector 41, and then the waste gas is subjected to a catalytic reaction through the catalytic bed 43, and then the waste gas is converted into harmless substances and harmless gas. The harmless gas is discharged through the high-efficiency separator 42, and the harmless substances are discharged through the discharge outlet 44, thus realizing the overall gas purification, making the discharged gas safer and more environmentally friendly, and solving the problems of insufficient deep purification, inability to self-circulate, and high maintenance cost.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-circulation deep purification device for a nuclear power exhaust system, characterized in that Comprising: A pretreatment module (10), which is connected and arranged at the exhaust outlet of the secondary circuit of a nuclear power plant; A main purification module (20), which is fixedly connected downstream of the pretreatment module (10) to deeply purify the gas roughly treated by the pretreatment module (10); A self-circulation module (30), which is fixedly connected to the clean gas outlet of the main purification module (20), and the gas purified by the main purification module (20) is re-introduced into the pretreatment module (10) through the self-circulation module (30); An exhaust gas treatment module (40), which is fixedly connected to the exhaust gas outlet of the main purification module (20), and the unpurified exhaust gas is collected and treated through the exhaust gas treatment module (40), and the harmful gas is converted into harmless substances for emission; Wherein, the purified gas is re-introduced into the pretreatment module (10) through the self-circulation module (30), thereby increasing the gas flow rate in the overall device and eliminating the need for external power supply; The main purification module (20) includes: A multi-stage filtering component (21), which is connected and arranged at one end of the pretreatment module (10) to deeply filter the gas roughly filtered in the pretreatment module (10); A deep purification component (22), which is connected and arranged at one end of the multi-stage filtering component (21) away from the pretreatment module (10); Wherein, the multi-stage filtering component (21) further performs multi-stage filtering on the pretreated gas to remove finer impurities in the gas, and at the same time, the deep purification component (22) further performs deep separation and filtering on the gas filtered by the multi-stage filtering component (21); The self-circulation module (30) includes: A collection box (31), which is connected and arranged on one side of the bottom of the deep purification component (22) to collect the purified gas; A fan (32), which is connected and arranged on the collection box (31) to extract the gas collected in the collection box (31); A return pipe (33), the first end of which is connected to the fan (32), and the second end of which is connected to the pretreatment module (10); Wherein, the fan (32) extracts the purified gas and transports it back to the pretreatment module (10) through the return pipe (33) to realize the recycling of the gas.

2. The self - circulation deep purification device for a nuclear power exhaust system according to claim 1, characterized in that, The pretreatment module (10) includes: A coarse filter (11), which is connected to the exhaust outlet of the secondary circuit of the nuclear power plant, and then the exhaust gas is introduced into the coarse filter (11); A sedimentation chamber (12), which is arranged downstream of the coarse filter (11) and connected to the coarse filter (11); A heat exchanger (13), which is arranged downstream of the sedimentation chamber (12) and connected to the sedimentation chamber (12); Among them, by connecting the coarse filter (11), the sedimentation chamber (12) and the heat exchanger (13) in sequence, the waste gas can be gradually introduced into each purification chamber in turn, and the waste gas is deeply filtered and purified in sequence.

3. The self-circulation deep purification device for a nuclear power exhaust system according to claim 2, wherein, The coarse filter (11) includes: An inlet pipe (111), and the inlet pipe (111) is connected to the waste gas discharge port of the secondary circuit of the nuclear power plant; A filter head (112), and the filter head (112) is integrally formed inside one end of the inlet pipe (111), and the filter head (112) is wrapped by the inlet pipe (111); Among them, after the filter head (112) is wrapped by one end of the inlet pipe (111), a cavity is formed between the filter head (112) and the inner wall of the inlet pipe (111), and one end of the filter head (112) is closed.

4. A self-circulating deep purification device for a nuclear power exhaust system according to claim 2, characterized in that, The sedimentation chamber (12) includes: A sedimentation box body (121), and the side wall of the sedimentation box body (121) is connected to the coarse filter (11) for inputting the coarsely filtered gas into the sedimentation box body (121); A plurality of sedimentation plates (122), and the plurality of sedimentation plates (122) are obliquely fixed inside the sedimentation box body (121), and the plurality of sedimentation plates (122) are distributed in multiple layers in sequence; Among them, the sedimentation plate (122) is used to move the introduced gas downward along the sedimentation plate (122) by gravity, and adsorb the impurities in the gas on the sedimentation plate (122) during the movement.

5. The self-circulation deep purification device for a nuclear power exhaust system according to claim 2, characterized in that, The heat exchanger (13) includes: A heat exchange box (131), and the heat exchange box (131) is connected to the side of the sedimentation chamber (12) away from the coarse filter (11); A plurality of heat exchange plates (132), and the plurality of heat exchange plates (132) are arranged inside the heat exchange box (131), and the plurality of heat exchange plates (132) are arranged in multiple layers along the height direction of the heat exchange box (131); Among them, a uniform gap is formed between each layer of the heat exchange plates (132), and the gas passes through the gap through the heat exchange plates (132) to reduce the temperature of the gas.

6. The self-circulation deep purification device for a nuclear power exhaust system according to claim 1, characterized in that The multi-stage filtering component (21) includes: A first filter (211), and the first filter (211) is connected to the pretreatment module (10), and the coarsely filtered gas is introduced into the first filter (211). A first filter cylinder (213) is arranged inside the first filter (211), and the first filter cylinder (213) is integrally formed with the first filter (211); A second filter (212), and the second filter (212) is arranged at one end of the first filter (211) away from the pretreatment module (10), and filter nets (214) are arranged at both ends inside the second filter (212); A third filter (215) is provided at one end of the second filter (212) away from the first filter (211), and a second filter cartridge (216) is integrally formed inside the third filter (215) corresponding to the second filter (212). Among them, the pore diameters of the first filter cartridge (213), the filter screen (214), and the second filter cartridge (216) decrease in sequence for filtering particulate matters of different sizes, and one end of the first filter cartridge (213) and the second filter cartridge is closed.

7. The self-circulation deep purification device for a nuclear power exhaust system according to claim 6, characterized in that, The deep purification component (22) includes: A deep purification box (221) that is connected to the gas outlet end of the third filter (215). Multiple adsorption layers (222) are arranged inside the deep purification box (221) for adsorbing radioactive gases in the introduced gas. A plasma reaction chamber (223) is arranged below the adsorption layer (222) inside the deep purification box (221). A radio frequency power supply (224) penetrates through the side wall of the deep purification box (221) and extends into the plasma reaction chamber (223). A separator (225) is fixedly arranged at the bottom of the deep purification box (221) for separating the gas separated by plasma technology. Among them, multiple adsorption layers (222) are filled with multiple adsorbents to adsorb radioactive gases through the multiple adsorption layers (222). Meanwhile, the radio frequency power supply (224) separates the gas, and the separator (225) outputs the purified gas and harmful gas separately.

8. A self-circulating deep purification device for a nuclear power exhaust system according to claim 7, characterized in that, The waste gas treatment module (40) includes: A waste gas collector (41) that is connected and arranged on one side of the bottom of the deep purification box (221) away from the multi-stage filtration component (21) for collecting the unpurified waste gas. A high-efficiency separator (42) is arranged on the waste gas collector (41) for discharging the purified gas. A catalytic bed (43) is arranged on the inner wall of the high-efficiency separator (42), and a catalyst layer is filled in the catalytic bed (43). An outlet (44) penetrates through the bottom of the waste gas collector (41) for discharging the substances after the catalytic reaction. An exhaust pipe (421) is arranged on the high-efficiency separator (42) for discharging the clean gas after catalysis. Among them, the waste gas collector (41) and the high-efficiency separator (42) are integrally formed, and the reaction-purified gas is discharged through the high-efficiency separator (42).

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