Self-circulation deep purification device of nuclear power exhaust system

Abstract

The invention provides a nuclear power exhaust system self-circulation deep purification device, and relates to the technical field of nuclear power exhaust, the nuclear power exhaust system self-circulation deep purification device comprises a pretreatment module, the pretreatment module is arranged at a nuclear power station secondary loop waste gas exhaust port in a communicating manner, and a main purification module is fixedly communicated at the downstream of the pretreatment module and performs deep purification on gas roughly treated by the pretreatment module; the self-circulation module is fixedly communicated with a purified gas outlet of the main purification module, gas purified by the main purification module is introduced into the pretreatment module again through the self-circulation module, the waste gas treatment module is fixedly communicated with a waste gas outlet of the purification module, and unpurified waste gas is collected and treated through the waste gas treatment module. The purified gas is re-introduced into the pretreatment module through the self-circulation module, so that the gas flow rate in the whole device is improved, and external power supply is not needed. The problems that in the prior art, deep purification is insufficient, self-circulation cannot be conducted, operation is complex, and the maintenance cost is high are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power exhaust, and in particular 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 operational safety and environmental friendliness of nuclear power equipment have become important concerns, especially the purification technology of nuclear power exhaust systems, which is directly related to the emission of radioactive substances and the control of environmental pollution. Although the existing purification devices of nuclear power exhaust systems have achieved the removal of radioactive particles to a certain extent, they are still insufficient in terms of in-depth purification and system self-circulation.

[0003] After searching, the existing invention patent with publication number (CN109939520B) of a supercritical fluid particle removal device and a supercritical fluid purification method discloses that the combined action of the filtering pipe section and the sedimentation pipe section realizes the strong removal of particles in the supercritical fluid, and can remove radioactive and non-radioactive particles with a particle size of less than 2.5 nanometers. However, the above-mentioned invention patent cannot effectively handle smaller particles, and thus the purification depth is limited. At the same time, it lacks self-circulation capability and mainly relies on an external power device and a filtering system. The operation is complicated and the maintenance cost is high 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 in the prior art of insufficient deep purification, inability to perform self-circulation, complex operation and high maintenance costs.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

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

[0007] A pre-processing module, wherein the pre-processing module is connected and arranged at the exhaust gas outlet of the secondary circuit of the nuclear power plant;

[0008] A main purification module, which is fixedly connected to the 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 clean 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, the exhaust gas treatment module is fixedly connected to the exhaust gas outlet of the purification module, and the unpurified exhaust gas is collected and processed by the exhaust gas treatment module, and harmful gases are converted into harmless substances for discharge;

[0011] The purified gas is reintroduced 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.

[0012] According to the self-circulating deep purification device for nuclear power exhaust system provided by the present invention: the pretreatment module comprises:

[0013] A coarse filter, the coarse filter is connected to the exhaust gas outlet of the secondary circuit of the nuclear power plant, and the exhaust gas is then introduced into the coarse filter;

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

[0015] a heat exchanger, the heat exchanger being arranged downstream of the settling chamber and connected to the settling chamber;

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

[0017] According to the self-circulating deep purification device for nuclear power exhaust system provided by the present invention: the coarse filter comprises:

[0018] An inlet pipe connected to an exhaust gas outlet of a secondary circuit of a nuclear power plant;

[0019] A filter head, the filter head is integrally formed and arranged 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 self-circulating deep purification device for nuclear power exhaust system provided by the present invention: the settling chamber comprises:

[0022] A sedimentation box, the side wall of which is connected to the coarse filter and is used to input the coarsely filtered gas into the sedimentation box;

[0023] A plurality of settling plates, wherein the plurality of settling plates are arranged in an inclined and fixed manner inside the settling box, and the plurality of settling plates are sequentially distributed in multiple layers;

[0024] The settling plate is used to move the introduced gas downward along the settling plate by gravity, and impurities in the gas are adsorbed on the settling plate during the movement.

[0025] According to the self-circulating deep purification device of the nuclear power exhaust system provided by the present invention: the heat exchanger comprises:

[0026] A heat exchange box, the heat exchange box is arranged in communication with the settling chamber on a side away from the coarse filter;

[0027] A plurality of heat exchange plates, wherein the plurality of heat exchange plates 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] There are uniform gaps between each layer of the heat exchange plates, and the gas passes through the heat exchange plates through the gaps to reduce the gas temperature.

[0029] According to the self-circulating deep purification device for nuclear power exhaust system provided by the present invention, the main purification module comprises:

[0030] A multi-stage filter component, which is connected to one end of the pre-processing module and is used to perform deep filtering on the coarsely filtered gas in the pre-processing module;

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

[0032] The multi-stage filtering component performs multi-stage filtration on the pre-treated gas again to remove finer impurities in the gas, and at the same time, the deep purification component performs deep separation filtration on the gas filtered by the multi-stage filtering component again.

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

[0034] A first filter, the first filter is connected to the pre-processing module, and the coarse filtered gas is passed into the first filter, a first filter cartridge is arranged inside the first filter, and the first filter cartridge and the first filter are integrally formed;

[0035] A second filter, wherein the second filter is arranged at an end of the first filter away from the pre-processing module, and filter screens are arranged at both ends of the second filter;

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

[0037] The apertures of the first filter cartridge, the filter net and the second filter cartridge decrease in sequence, and are used to filter particles of different sizes. In addition, one end of the first filter cartridge and the second filter cartridge is closed.

[0038] According to the self-circulating deep purification device of the nuclear power exhaust system provided by the present invention, the deep purification component comprises:

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

[0040] A multi-layer adsorption layer, wherein the multi-layer adsorption layer is arranged inside the deep purification box and is used to adsorb radioactive gas in the introduced gas;

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

[0042] A radio frequency power source, the radio frequency power source extending through the side wall of the deep purification box into the plasma reaction chamber;

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

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

[0045] According to the self-circulation deep purification device of the nuclear power exhaust system provided by the present invention, the self-circulation module comprises:

[0046] A collecting box, the collecting box is connected to one side of the bottom of the deep purification box and is used to collect the purified gas;

[0047] A fan, the fan is connected to the collecting box and is used to extract the gas collected in the collecting box;

[0048] A return pipe, wherein a first end of the return pipe is connected to the fan, and a second end of the return pipe is connected to the pre-processing module;

[0049] The fan extracts the purified gas and transports it to the pretreatment module again through the return pipe to achieve gas recycling.

[0050] According to the self-circulating deep purification device of the nuclear power exhaust system provided by the present invention: the exhaust gas treatment module comprises:

[0051] An exhaust gas collector, the exhaust gas collector is arranged at the bottom of the deep purification box and is away from the multi-stage filtering component, and is used to collect unpurified exhaust gas;

[0052] A high-efficiency separator, which is arranged on the exhaust gas collector and is used to discharge the purified gas;

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

[0054] An exhaust port, the exhaust port is arranged through the bottom of the exhaust gas collector and is used to discharge substances after the catalytic reaction;

[0055] An exhaust pipe, which is arranged on the high-efficiency separator and is used to discharge clean gas after catalysis;

[0056] The exhaust gas collector and the high-efficiency separator are integrally formed, and the gas purified by the reaction is discharged through the high-efficiency separator.

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

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

[0059] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

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

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

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

[0066] Figure 6 is a cross-sectional structural diagram of a multi-stage filter component according to an embodiment of the present invention;

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

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

[0069] Fig. 9 4 is a cross-sectional plan view of an exhaust gas treatment module according to 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; 122. sedimentation plate;

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

[0075] 20. Main purification module; 21. Multi-stage filtration component; 22. Deep purification component;

[0076] 211, first filter; 212, second filter; 213, first filter cartridge; 214, filter screen; 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. Waste gas treatment module; 41. Waste gas collector; 42. High-efficiency separator; 43. Catalytic bed; 44. Exhaust port; 421. Exhaust pipe. DETAILED DESCRIPTION

[0080] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0081] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", etc., are only used for descriptive purposes and cannot be understood 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 specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, 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 specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

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

[0085] Combine the following Figure 1-Figure 9 The embodiments shown describe the technical solution of the present invention:

[0086] A self-circulating deep purification device for a nuclear power exhaust system comprises a pretreatment module 10, which is connected and arranged at a secondary circuit exhaust outlet 44 of a nuclear power plant; a main purification module 20, which is fixedly connected to the downstream of the pretreatment module 10 and deeply purifies 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 re-introduces the clean gas purified by the main purification module 20 into the pretreatment module 10 through the self-circulation module 30; and a waste gas treatment module 40, which is fixedly connected to the waste gas outlet of the purification module and collects and re-processes the unpurified waste gas through the waste gas treatment module 40, converting harmful gases into harmless substances for discharge, 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 without the need for external power.

[0087] It can be understood that: the pretreatment module 10 is connected to the exhaust gas outlet 44 of the secondary circuit of the nuclear power plant, and the radioactive exhaust gas generated by the nuclear reaction is introduced into the pretreatment module 10, the exhaust gas is pretreated, and some larger impurities are filtered out. The pretreatment module 10 can select a preliminary filtering device, such as a double-layer sleeve filter cartridge, and its filter caliber selection is successively reduced. An adsorption filter chamber can also be selected to perform preliminary adsorption filtration on the introduced exhaust gas, wherein the filter cartridge filtration and adsorption filtration include but are not limited to filter mesh filtration and activated carbon adsorption filtration. The above is an optional method for preliminary treatment of the pretreatment module 10, and this embodiment does not make any limitation on this. At the same time, the gas is treated and then introduced into the main purification module 20, and the radioactive gas is deeply filtered and purified by the main purification module 20, and the radioactive impurities and radioactive gases in the exhaust gas are separated, and the separated purified gas is sent to the self-circulation module 30 again. In the pretreatment module 10, the purified gas can be recycled again, thereby improving the purification efficiency of the device, and the self-circulation module 30 can use the vacuum method or the negative pressure method to pass the separated and purified gas into the pretreatment module. The above-mentioned treatment method is an optional method of this embodiment, and there is no limitation on this. Moreover, the introduction of purified gas can better accelerate the circulation of waste gas, thereby better reducing the operating cost during waste gas purification. At the same time, the waste gas treatment module 40 is set to collect the unpurified gas. The waste gas treatment module 40 catalytically reacts or dissolves the harmful gas after treatment in a liquid. Catalytic reaction and dissolution with liquid are optional methods for treating unpurified waste gas. There is no limitation on this in this embodiment. Then, the clean gas is discharged after reaction treatment by the waste gas treatment module 40, so that the discharged gas reaches a safe emission level, so that it can be better discharged into the atmosphere.

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

[0089] According to the self-circulating deep purification device of the nuclear power exhaust system provided by the embodiment of the present invention, the pretreatment module 10 includes a coarse filter 11, which is connected to the secondary circuit exhaust gas outlet 44 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, and a heat exchanger 13, which is arranged downstream of the sedimentation chamber 12 and connected to the sedimentation chamber 12, wherein the coarse filter 11, the sedimentation chamber 12 and the heat exchanger 13 are connected in sequence, so that the exhaust gas can be gradually introduced into each purification chamber in sequence, and the exhaust gas is deeply filtered and purified in sequence.

[0090]

[0091]

[0092] Table 1 shows the distribution of nuclear power waste gas

[0093] Figure 1 and Figure 2A self-circulating deep purification device for a nuclear power exhaust system is implemented in the invention. The pretreatment module 10 is formed by 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 secondary exhaust gas outlet 44 of the nuclear power plant. The radioactive gas introduced is coarsely filtered through the coarse filter 11 to filter out some substances with larger particles. The coarsely filtered gas is then sent to the sedimentation chamber 12 again for sedimentation filtration. During the sedimentation filtration, larger particles are further removed by gravity sedimentation, and 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 through the main purification module 20, thereby improving the subsequent purification efficiency.

[0094] According to the self-circulation deep purification device of the nuclear power exhaust system provided by the embodiment of the present invention, the coarse filter 11 includes an inlet pipe 111, which is connected to the exhaust gas outlet 44 of the secondary circuit of the nuclear power plant, and a filter head 112. The filter head 112 is integrally formed and arranged inside one end of the inlet pipe 111, and the filter head 112 is wrapped by the inlet pipe 111, wherein 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 in the invention, wherein the coarse filter 11 is formed by a combination of an inlet pipe 111 and a filter head 112, and flanges are provided at both ends of the inlet pipe 111, which are connected to the secondary circuit exhaust gas outlet 44 of the nuclear power plant through the flanges, and the filter head 112 is provided in the inlet pipe 111 and is integrally connected to the inlet pipe 111, and one end of the filter head 112 is closed, so that the gas can be better filtered through the filter head 112 after entering, and particles with larger diameters can be filtered and processed. Since the filter head 112 is provided inside the inlet pipe 111, a cavity is formed between the filter head 112 and the inner wall of the inlet pipe 111, the gas is filtered, and the filtered gas is passed to the next process.

[0096] According to the self-circulating deep purification device of the nuclear power exhaust system provided by the embodiment of the present invention, the sedimentation chamber 12 includes a sedimentation box 121, the side wall of the sedimentation box 121 is connected to the coarse filter 11, and is used to input the coarse filtered gas into the sedimentation box 121, and a plurality of sedimentation plates 122 are arranged obliquely and fixedly inside the sedimentation box 121, and the plurality of sedimentation plates 122 are distributed in multiple layers in sequence, wherein the sedimentation plates 122 are used to move the introduced gas 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 the shape of a rectangular parallelepiped. 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 arranged 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 for adsorbing 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, so as to facilitate deep purification treatment.

[0098] According to the self-circulation deep purification device of the nuclear power exhaust system provided by the embodiment of the present invention, the heat exchanger 13 includes a heat exchange box 131, and the heat exchange box 131 is connected and arranged on the side of the sedimentation chamber 12 away from the coarse filter 11, and a 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 the 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 and arranged at the bottom of a side of the sedimentation chamber 12 away from the coarse filter 11, and the sedimentation box is connected. 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 laid flat 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 self-circulating deep purification device of the nuclear power exhaust system provided by the embodiment of the present invention, the main purification module 20 includes a multi-stage filtering component 21, which is connected to one end of the pretreatment module 10 and is used to deeply filter the coarsely filtered gas in the pretreatment module 10, and a deep purification component 22. The deep purification component 22 is connected to one end of the multi-stage filtering component 21 away from the pretreatment module 10, wherein the multi-stage filtering component 21 performs multi-stage filtration on the pretreated gas again to remove finer impurities in the gas, and at the same time, the gas filtered by the multi-stage filtering component 21 is deeply separated and filtered again by the deep purification component 22.

[0101] Figure 1 and Figure 2 A self-circulating deep purification device for a nuclear power exhaust system is implemented in the present invention. The main purification module 20 is formed by a combination of a multi-stage filter component 21 and a deep purification component 22. The multi-stage filter component 21 is connected to the sedimentation box in the pretreatment module 10, and the treated gas is passed into the multi-stage filter component 21 through the heat exchange box 131 on the sedimentation box, and then the gas is deeply purified by the multi-stage filter component 21. At the same time, the deep purification component 22 is connected to the other end of the multi-stage filter component 21, and the gas filtered by the multi-stage filter component 21 is passed into the deep purification component 22 again, and the radioactive gas is better purified and separated by the deep purification component 22, and then the clean gas is separated. At the same time, the multi-stage filter component 21 and the deep purification component 22 can better filter and process smaller particles in the gas, and then separate the clean gas.

[0102] According to the self-circulating deep purification device of the nuclear power exhaust system provided by the embodiment of the present invention, the multi-stage filtering component 21 includes a first filter 211, the first filter 211 is connected to the pretreatment module 10, and the coarse filtered gas is passed into the first filter 211. The first filter cartridge 213 is arranged inside the first filter 211, and the first filter cartridge 213 and the first filter 211 are integrally formed. The second filter 212 is arranged at the end of the first filter 211 away from the pretreatment module 10, and the filter net 214 is arranged at both ends of the second filter 212. The third filter 215 is arranged at the end of the second filter 212 away from the first filter 211, and the interior of the third filter 215 is integrally formed with the second filter cartridge 216 corresponding to the second filter 212, wherein the apertures of the first filter cartridge 213, the filter net 214 and the second filter cartridge 216 are successively reduced for filtering particulate matter of different sizes, and one end 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 in the invention. The multi-stage filtering component 21 is formed by 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 box in the pretreatment module 10, so that the gas cooled after coarse filtration is passed into the first filter 211. At the same time, a first filter cartridge 213 is arranged 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 screens 214 are arranged at both ends of the second filter 212. The filter screen 214 seals and closes both ends of the second filter 212, and a high-efficiency filter screen 214 is connected to the other end of the second filter 212, and a second filter cartridge 216 is arranged inside the high-efficiency filter screen 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 the other end closed. The second filter cartridge 216 is integrally formed and arranged on the third filter 215. After the gas passes through the multi-stage filter component 21, since there are multiple filters and the filter aperture size of each filter is different, the filter aperture of the multi-stage filter component 21 becomes smaller from primary efficiency to high efficiency, and then gradually filters finer impurities in the air, so that the overall filtering effect is better and deep filtering is achieved.

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

[0105] Figure 8A self-circulating deep purification device for a nuclear power exhaust system is implemented in the invention, wherein 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, and the deep purification box 221 is connected to the gas outlet 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 arranged 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, and this adsorption layer 222 is not limited to these two adsorbents, and other adsorbents such as resin can also be used, and the total thickness of the multi-layer adsorption layer 222 formed by the combination of the molecular sieve and the activated carbon is 100 mm, and then through The adsorption layer 222 adsorbs the 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, and a radio frequency power supply 224 is inserted laterally through the side wall of the deep purification box 221 in the plasma reaction chamber 223. The magnetic field generated by the 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, and then the clean gas is separated.

[0106] According to the self-circulation deep purification device of the nuclear power exhaust system provided by the 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, and is used to collect the purified gas, a fan 32, which is connected and arranged on the collecting box 31, and is used to extract the gas collected by the collecting box 31, and 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, so as to realize the recycling and reuse of the gas.

[0107] Figure 1 and Figure 2A self-circulating deep purification device for a nuclear power exhaust system has been implemented. The self-circulating module 30 is formed by a collection box 31, a fan 32 and a return pipe 33. The collection box 31 is connected to the side wall of the deep purification box and is connected to the clean gas outlet 44 of the separator 225, so as to collect the clean gas separated by the deep purification box. The fan 32 is arranged on the top of the collection box 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, and then the separated clean gas is extracted from the collection box 31 by the fan 32, and transported to the coarse filter 11 along the return pipe 33, so as to realize the self-circulation of the gas and make the gas filtering effect better.

[0108] According to the self-circulating deep purification device of the nuclear power exhaust system provided by the embodiment of the present invention, the exhaust gas treatment module 40 includes an exhaust gas collector 41, which is connected and arranged at the bottom of the deep purification box 221 and away from the side of the multi-stage filter component 21, and is used to collect unpurified exhaust gas, a high-efficiency separator 42, which is arranged on the exhaust 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 the catalytic bed 43 is filled with a catalyst layer, an exhaust port 44, which is arranged through the bottom of the exhaust gas collector 41 and is used to discharge substances after catalytic reaction, and an exhaust pipe 421, which is arranged on the high-efficiency separator 42 and is used to discharge clean gas after catalysis; wherein the exhaust 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 Fig. 9 A self-circulating deep purification device for a nuclear power exhaust system is implemented in the invention. The exhaust gas treatment module 40 is formed by a combination of an exhaust gas collector 41, a high-efficiency separator 42, and an exhaust outlet 44 of a catalyst bed 43. The exhaust gas collector 41 is connected to the unpurified gas outlet of the separator 225 at the bottom of the deep purification box 221 to collect the unpurified gas. At the same time, a high-efficiency separator 42 is fixedly arranged on the top of the exhaust gas collector 41. A catalyst bed 43 is arranged between the high-efficiency separator 42 and the exhaust gas collector 41. The catalyst bed 43 is filled with a catalyst layer. The catalytic material used in the chemical layer is a platinum-palladium catalyst, and the gas collected in the exhaust collector 41 is subjected to a catalytic reaction to convert harmful gases into harmless substances. The generated harmless gases are 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 channel of the nuclear power plant, so that the exhausted gas is clean and pollution-free, and the harmless substances after the reaction conversion are discharged and collected through the exhaust port 44, so that the exhausted air is more in line with the emission requirements, while ensuring the safety and environmental protection of the gas emission.

[0110] Usage process:

[0111] When in use, the whole device is installed at the exhaust outlet 44 of the secondary circuit of the nuclear power plant, and the device is connected to the exhaust outlet 44, so that the exhaust gas is passed into the device, and the gas is roughly treated through the pretreatment module 10 on the device, and the larger particles are filtered in advance. At the same time, the gas is cooled and then passed into the main purification module 20, and the gas is deeply filtered and purified through the main purification module 20, some fine particles in the gas are filtered, and radioactive substances are adsorbed, and then the gas is separated, and the harmful gas and harmless clean gas are separated and transported in different directions respectively. The harmful gas is sent to the exhaust gas collector 41 through the separator 225, and the harmless clean gas is passed. The waste gas is sent into the collecting box 31 through the separator 225, and the harmless clean gas is transported to the coarse filter 11 in the pretreatment module 10 through the fan 32 and the reflux pipe 33, thereby realizing the self-circulation of the filtered gas, thereby improving the filtering efficiency of the gas, and the separated harmful gas is collected by the exhaust gas collector 41, and then the exhaust gas is catalytically reacted by the catalytic bed 43, thereby converting the exhaust gas into harmless substances and harmless gases, and the harmless gas is discharged through the high-efficiency separator 42, and the harmless substances are discharged through the exhaust port 44, thereby realizing the entire gas purification, making the discharged gas safer and more environmentally friendly, thereby 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 it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-circulating deep purification device for a nuclear power exhaust system, characterized in that: include: A pre-processing module (10), the pre-processing module (10) being arranged in communication with the exhaust gas outlet of the secondary circuit of the nuclear power plant; A main purification module (20), the main purification module (20) being fixedly connected to the downstream of the pretreatment module (10) and performing deep purification on the gas roughly treated by the pretreatment module (10); A self-circulation module (30), wherein the self-circulation module (30) is fixedly connected to the clean gas outlet of the main purification module (20), and the clean 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), the exhaust gas treatment module (40) being fixedly connected to the exhaust gas outlet of the main purification module (20), collecting and treating the unpurified exhaust gas through the exhaust gas treatment module (40), and converting the harmful gas into harmless substances for discharge; The purified gas is reintroduced into the pretreatment module (10) through the self-circulation module (30), thereby increasing the gas flow rate in the overall device without the need for external power supply.

2. A nuclear power exhaust system self-circulation deep purification device according to claim 1, characterized in that: The pre-processing module (10) comprises: A coarse filter (11), the coarse filter (11) being connected to the exhaust gas outlet of the secondary circuit of the nuclear power plant, and the exhaust gas is then introduced into the coarse filter (11); a sedimentation chamber (12), the sedimentation chamber (12) being arranged downstream of the coarse filter (11) and being connected to the coarse filter (11); a heat exchanger (13), the heat exchanger (13) being arranged downstream of the settling chamber (12) and connected to the settling chamber (12); The coarse filter (11), the settling chamber (12) and the heat exchanger (13) are connected in sequence, so that the exhaust gas can be gradually passed into each purification chamber in sequence, and the exhaust gas is deeply filtered and purified in sequence.

3. A nuclear power exhaust system self-circulation deep purification device according to claim 2, characterized in that: The coarse filter (11) comprises: An inlet pipe (111), wherein the inlet pipe (111) is connected to an exhaust gas outlet of a secondary circuit of a nuclear power plant; A filter head (112), the filter head (112) being integrally formed and arranged inside one end of the inlet pipe (111), and the filter head (112) is wrapped by the inlet pipe (111); Wherein, 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 nuclear power exhaust system self-circulation deep purification device according to claim 2, characterized in that: The settling chamber (12) comprises: A sedimentation box (121), the side wall of which is connected to the coarse filter (11) and is used to input the coarsely filtered gas into the sedimentation box (121); A plurality of settling plates (122), wherein the plurality of settling plates (122) are arranged in an inclined and fixed manner inside the settling box (121), and the plurality of settling plates (122) are sequentially distributed in multiple layers; The settling plate (122) is used to move the introduced gas downward along the settling plate (122) by gravity, and impurities in the gas are adsorbed on the settling plate (122) during the movement.

5. A nuclear power exhaust system self-circulation deep purification device according to claim 2, characterized in that: The heat exchanger (13) comprises: a heat exchange box (131), the heat exchange box (131) being arranged in communication with the sedimentation chamber (12) on a side away from the coarse filter (11); A plurality of heat exchange plates (132), wherein 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 a height direction of the heat exchange box (131); Uniform gaps are formed between each layer of the heat exchange plates (132), and the gas passes through the heat exchange plates (132) through the gaps, thereby reducing the temperature of the gas.

6. A nuclear power exhaust system self-circulation deep purification device according to claim 1, characterized in that: The main purification module (20) comprises: A multi-stage filtering component (21), the multi-stage filtering component (21) being arranged in communication with one end of the pre-processing module (10) and used for deeply filtering the gas roughly filtered in the pre-processing module (10); A deep purification component (22), the deep purification component (22) being arranged in communication with an end of the multi-stage filtering component (21) away from the pre-treatment module (10); The multi-stage filtering component (21) performs multi-stage filtration on the pre-treated gas again to remove finer impurities in the gas, and at the same time, the deep purification component (22) performs deep separation filtration on the gas filtered by the multi-stage filtering component (21) again.

7. A nuclear power exhaust system self-circulation deep purification device according to claim 6, characterized in that: The multi-stage filtering component (21) comprises: A first filter (211), the first filter (211) being in communication with the pre-processing module (10), and passing the coarse filtered gas into the first filter (211), a first filter cartridge (213) being arranged inside the first filter (211), and the first filter cartridge (213) and the first filter (211) being integrally formed; A second filter (212), the second filter (212) being arranged at an end of the first filter (211) away from the pre-processing module (10), and filter screens (214) being arranged at both ends of the second filter (212); a third filter (215), the third filter (215) being arranged at an end of the second filter (212) away from the first filter (211), and a second filter cartridge (216) being integrally formed inside the third filter (215) corresponding to the second filter (212); The apertures of the first filter cartridge (213), the filter screen (214) and the second filter cartridge (216) decrease in sequence, and are used to filter particles of different sizes, and one end of the first filter cartridge (213) and the second filter cartridge are closed.

8. A nuclear power exhaust system self-circulation deep purification device according to claim 7, characterized in that: The deep purification component (22) comprises: A deep purification box (221), the deep purification box (221) being connected to the air outlet end of the third filter (215); A multi-layer adsorption layer (222), wherein the multi-layer adsorption layer (222) is arranged inside the deep purification box (221) and is used to adsorb radioactive gas in the introduced gas; A plasma reaction chamber (223), wherein the plasma reaction chamber (223) is arranged below the adsorption layer (222) inside the deep purification box (221); A radio frequency power source (224), the radio frequency power source (224) penetrating through a side wall of the deep purification box (221) and extending into the plasma reaction chamber (223); A separator (225), the separator (225) is fixedly arranged at the bottom of the deep purification box (221), and is used to separate the gas separated by the plasma technology; The multiple layers of adsorption layers (222) are filled with multiple layers of adsorbent (activated carbon and molecular sieve), and the radioactive gas is adsorbed by the multiple layers of adsorption layers (222). At the same time, the radio frequency power supply (224) separates the gas, and the purified gas and the harmful gas are output separately through the separator (225).

9. A nuclear power exhaust system self-circulation deep purification device according to claim 8, characterized in that: The self-circulation module (30) comprises: A collecting box (31), the collecting box (31) is arranged in communication with one side of the bottom of the deep purification box (221) and is used to collect the purified gas; a fan (32), the fan (32) being connected to the collection box (31) and being used to extract the gas collected by the collection box (31); a return pipe (33), wherein a first end of the return pipe (33) is connected to the fan (32), and a second end of the return pipe (33) is connected to the pre-processing module (10); The fan (32) extracts the purified gas and transports it back to the pretreatment module (10) through the return pipe (33), thereby realizing the recycling of the gas.

10. A nuclear power exhaust system self-circulation deep purification device according to claim 8, characterized in that: The exhaust gas treatment module (40) comprises: An exhaust gas collector (41), the exhaust gas collector (41) being arranged in communication with the bottom of the deep purification box (221) and away from the multi-stage filter component (21) and used for collecting unpurified exhaust gas; a high-efficiency separator (42), the high-efficiency separator (42) being arranged on the exhaust gas collector (41) and being used for discharging the purified gas; A catalytic bed (43), wherein the catalytic bed (43) is arranged on the inner wall of the high-efficiency separator (42), and the catalytic bed (43) is filled with a catalyst layer; An exhaust port (44), the exhaust port (44) is arranged through the bottom of the exhaust gas collector (41) and is used to discharge substances after the catalytic reaction; An exhaust pipe (421), the exhaust pipe (421) being arranged on the high-efficiency separator (42) and used for discharging clean gas after catalysis; The waste gas collector (41) and the high-efficiency separator (42) are integrally formed, and the gas purified by the reaction is discharged through the high-efficiency separator (42).

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