Nuclear power plant waste gas treatment system

Abstract

The utility model relates to a nuclear power plant waste gas treatment system which comprises a hydrogen removal device, a gas inlet device, a carbon removal device, a gas exhaust device and a first backflow pipeline, and the hydrogen removal device is provided with a first gas inlet end and a first gas outlet end which communicate with each other; the air inlet device is used for conveying waste gas and air to the first air inlet end; the carbon removal device is provided with a second gas inlet end and a second gas outlet end which are communicated, and the second gas inlet end is communicated with the first gas outlet end; the exhaust device is communicated with the second air outlet end; the first backflow pipeline is provided with a first backflow port and a second backflow port which are communicated, the first backflow port is communicated with the first air outlet end, and the second backflow port is communicated with the first air inlet end. Compared with the prior art, the waste gas treatment system for the nuclear power plant can convey the hydrogen-removed waste gas into the hydrogen removal device again, so that the hydrogen concentration of the waste gas entering the hydrogen removal device is reduced, explosion accidents are prevented, and safe waste gas treatment of the nuclear power plant is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear power plant waste gas treatment, and in particular to a nuclear power plant waste gas treatment system. Background Art

[0002] A nuclear power plant is a facility that converts nuclear energy into electrical energy through special equipment. The nuclear fuel in the nuclear reactor releases a large amount of heat energy through nuclear fission or nuclear fusion, which is then converted into electrical energy to provide clean and efficient electricity resources.

[0003] Although nuclear power generation has many advantages, it also faces challenges in nuclear waste disposal. In traditional technologies, due to the high hydrogen content in nuclear power plant exhaust gas, explosion accidents are prone to occur during the exhaust gas treatment process, resulting in casualties and economic losses. Summary of the invention

[0004] Based on this, it is necessary to provide a nuclear power plant waste gas treatment system to address the problem of explosion accidents that are prone to occur during the waste gas treatment process of nuclear power plants.

[0005] The technical solution is as follows:

[0006] One embodiment provides a nuclear power plant exhaust gas treatment system, comprising:

[0007] A dehydrogenation device, the dehydrogenation device having a first gas inlet end and a first gas outlet end connected to each other;

[0008] an air intake device, the air intake device being used to deliver exhaust gas and air to the first air intake end;

[0009] A carbon removal device, the carbon removal device having a second air inlet end and a second air outlet end connected to each other, the second air inlet end being connected to the first air outlet end;

[0010] an exhaust device, the exhaust device being in communication with the second air outlet; and

[0011] The first return pipe has a first return port and a second return port connected to each other, the first return port is connected to the first air outlet, and the second return port is connected to the first air inlet.

[0012] In the above-mentioned nuclear power plant waste gas treatment system, the air intake device transports the waste gas and air together to the dehydrogenation device through the first air intake end, and the oxygen in the air and the hydrogen in the waste gas are catalytically oxidized in the dehydrogenation device to remove the hydrogen element in the waste gas. The waste gas after dehydrogenation is discharged from the first air outlet end and enters the decarbonation device through the second air intake end. The decarbonation device catalytically oxidizes the carbon-containing organic matter in the waste gas to remove the carbon element in the waste gas. The waste gas after dehydrogenation and decarbonation is discharged through the second air outlet end and discharged through the exhaust device to prevent the waste gas from polluting the environment. However, since the waste gas is not treated The hydrogen concentration during treatment is high. At this time, if it reacts with oxygen in the air, it is easy to explode. By setting a first reflux pipe, part of the waste gas after dehydrogenation can be transported from the first reflux port to the second reflux port, and re-enter the dehydrogenation device through the first air inlet end to reduce the concentration of hydrogen in the gas entering the dehydrogenation device. Compared with traditional technology, the above-mentioned nuclear power plant waste gas treatment system can transport the waste gas after dehydrogenation to the dehydrogenation device again, thereby reducing the hydrogen concentration of the waste gas entering the dehydrogenation device, preventing the occurrence of explosion accidents, and ensuring the safe conduct of nuclear power plant waste gas treatment.

[0013] The technical solution is further described below:

[0014] In one of the embodiments, the first reflux pipe is further provided with a first reflux pump, and the first reflux pump is used to transport the exhaust gas from the first reflux port to the second reflux port.

[0015] In one embodiment, the air intake device includes a decarbonization mechanism, which has a third air intake end and a third air outlet end that are connected. The third air intake end is used to connect with the outside world, and the third air outlet end is connected with the first air intake end. The air enters the first air intake end after passing through the decarbonization mechanism.

[0016] In one embodiment, the decarbonization mechanism further comprises a fourth gas outlet connected to the third gas inlet, and the fourth gas outlet is connected to the second gas inlet.

[0017] In one embodiment, the nuclear power plant exhaust gas treatment system also includes a second return pipe, the second return pipe has a third return port and a fourth return port connected to each other, the third return port is connected to the second gas outlet end, and the fourth return port is connected to at least one of the first gas inlet end, the second gas inlet end and the third gas inlet end.

[0018] In one embodiment, the second reflux pipe is further provided with a second reflux pump, and the second reflux pump is used to transport the exhaust gas from the third reflux port to the fourth reflux port.

[0019] In one embodiment, the first reflux pipeline is provided with a first reflux valve, and the first reflux valve is used to control the flow of the first reflux pipeline; or / and,

[0020] The second reflux pipeline is provided with a second reflux valve, and the second reflux valve is used to control the flow of the second reflux pipeline.

[0021] In one embodiment, the decarbonization mechanism also includes a first connecting pipe and a second connecting pipe, one end of the first connecting pipe is connected to the third gas outlet end, the other end of the first connecting pipe is connected to the first gas inlet end, one end of the second connecting pipe is connected to the third gas outlet end, and the other end of the second connecting pipe is connected to the second gas inlet end.

[0022] In one of the embodiments, the decarbonization mechanism further includes an air intake pump, which is disposed at the third air intake end and is used to transport the air to the third air intake end.

[0023] In one embodiment, the air intake device further includes a first air intake pipe and a first air intake valve, one end of the first air intake pipe is used to be arranged in the exhaust gas storage device, the other end of the first air intake pipe is arranged at the first air intake end, and the first air intake valve is arranged in the first air intake pipe and is used to control the flow of the first air intake pipe; or / and,

[0024] The air intake device also includes a second air intake pipe and a second air intake valve, one end of the second air intake pipe is used to communicate with the outside, the other end of the second air intake pipe is arranged at the third air intake end, and the second air intake valve is arranged in the second air intake pipe and is used to control the flow of the second air intake pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 Schematic diagram of a nuclear power plant exhaust gas treatment system in one embodiment of the present application.

[0027] Figure 2 This is a schematic diagram of a nuclear power plant exhaust gas treatment system in another embodiment of the present application.

[0028] Notes on the attached drawings:

[0029] 100, dehydrogenation device; 110, first air inlet end; 120, first air outlet end; 121, first branch valve; 200, air inlet device; 210, decarbonization mechanism; 211, third air inlet end; 212, third air outlet end; 213, fourth air outlet end; 220, first connecting pipe; 221, first connecting valve; 230, second connecting pipe; 231, second connecting valve; 240, air intake pump; 250, first air inlet pipe; 251, first air inlet valve; 260, second air inlet pipe; 261, second air inlet valve; 300, carbon removal device; 310, second air inlet end; 320, second air outlet end; 321, second bypass valve; 400, exhaust device; 500, first reflux pipe; 510, first reflux port; 520, second reflux port; 530, first reflux pump; 540, first reflux valve; 600, exhaust gas storage device; 700, second reflux pipe; 710, third reflux port; 720, fourth reflux port; 730, second reflux pump; 740, second reflux valve. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 a limitation on the present application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that 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.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0036] See also Figure 1 to Figure 2 An embodiment of the present application provides a nuclear power plant waste gas treatment system, including a dehydrogenation device 100, an air intake device 200, a decarbonation device 300, an exhaust device 400 and a first return pipe 500, the dehydrogenation device 100, the dehydrogenation device 100 has a first air intake end 110 and a first air outlet end 120 that are connected; the air intake device 200 is used to transport waste gas and air to the first air intake end 110; the decarbonation device 300 has a second air intake end 310 and a second air outlet end 320 that are connected, and the second air intake end 310 is connected to the first air outlet end 120; the exhaust device 400 is connected to the second air outlet end 320; the first return pipe 500 has a first return port 510 and a second return port 520 that are connected, the first return port 510 is connected to the first air outlet end 120, and the second return port 520 is connected to the first air intake end 110.

[0037] In the above-mentioned nuclear power plant waste gas treatment system, the air intake device 200 transports the waste gas and air together to the dehydrogenation device 100 through the first air intake terminal 110, and the oxygen in the air and the hydrogen in the waste gas are catalytically oxidized in the dehydrogenation device 100 to remove the hydrogen element in the waste gas. The waste gas after dehydrogenation is discharged from the first air outlet terminal 120 and enters the decarbonation device 300 through the second air intake terminal 310. The decarbonation device 300 catalytically oxidizes the carbon-containing organic matter in the waste gas to remove the carbon element in the waste gas. The waste gas after dehydrogenation and decarbonation is discharged through the second air outlet terminal 320 and discharged through the exhaust device 400 to prevent the waste gas from polluting the environment. However, since the waste gas is The concentration of hydrogen before being treated is high. At this time, if it reacts with oxygen in the air, it is easy to explode. By setting up the first reflux pipe 500, part of the waste gas after dehydrogenation can be transported from the first reflux port 510 to the second reflux port 520, and re-enter the dehydrogenation device 100 through the first air inlet 110 to reduce the concentration of hydrogen in the gas entering the dehydrogenation device 100; compared with the traditional technology, the above-mentioned nuclear power plant waste gas treatment system can transport the waste gas after dehydrogenation to the dehydrogenation device 100 again, thereby reducing the hydrogen concentration of the waste gas entering the dehydrogenation device 100, preventing the occurrence of explosion accidents, and ensuring the safe implementation of nuclear power plant waste gas treatment.

[0038] In one embodiment, the air intake device 200 is used to connect with the outside world and the waste gas storage device 600 in the nuclear power plant. The air intake device 200 can transport the outside air to the first air intake end 110. At the same time, it can also transport the waste gas in the waste gas storage device 600 to the first air intake end 110. The waste gas and the oxygen in the air are catalytically oxidized in the dehydrogenation device 100 to remove the hydrogen in the waste gas.

[0039] Furthermore, in the above embodiment, when the oxygen content entering the dehydrogenation device 100 is higher than 6%, the concentration of hydrogen needs to be controlled below 1% to avoid explosion.

[0040] Specifically, the dehydrogenation device 100 includes a first mixing mechanism, a first heating mechanism, a first reaction mechanism, a first condensing mechanism and a gas-liquid separation mechanism which are connected in sequence. The first mixing mechanism is used to evenly mix the air and the exhaust gas. The first heating mechanism is used to heat the mixed air and the exhaust gas to achieve an optimal temperature for catalytic oxidation and increase the speed of catalytic oxidation. The first reaction mechanism can react the hydrogen in the exhaust gas with the oxygen in the air to generate water. The first condensing mechanism condenses the water to generate liquid water. The gas-liquid separation mechanism separates and discharges the liquid water to remove the hydrogen in the exhaust gas.

[0041] Specifically, the hydrogen in the above embodiment is tritium hydrogen, and the carbon-containing organic matter is 14 C organic matter.

[0042] See also Figure 1 to Figure 2 In one embodiment, the first reflux pipeline 500 is further provided with a first reflux pump 530 , and the first reflux pump 530 is used to transport the exhaust gas from the first reflux port 510 to the second reflux port 520 .

[0043] By setting up the first reflux pump 530, the waste gas after dehydrogenation is transported from the first reflux port 510 to the second reflux port 520, and then enters the dehydrogenation device 100 through the first air inlet 110, thereby reducing the concentration of hydrogen in the dehydrogenation device 100. The structure is simple and the transportation process is reliable, which prevents the occurrence of explosion and improves the safety of waste gas treatment.

[0044] Optionally, there may be one or more first reflux pumps 530 , which is not specifically limited here.

[0045] See also Figure 1 to Figure 2 In one embodiment, the air intake device 200 includes a decarbonization mechanism 210, which has a third air intake end 211 and a third air outlet end 212 that are connected to each other. The third air intake end 211 is used to communicate with the outside world, and the third air outlet end 212 is connected to the first air intake end 110. The air enters the first air intake end 110 after passing through the decarbonization mechanism 210.

[0046] The outside air enters the decarbonization mechanism 210 through the third air inlet port 211, and the decarbonization mechanism 210 effectively removes carbon dioxide in the air to prevent the carbon dioxide in the air from entering the decarbonization device 300 via the dehydrogenation device 100 and increasing the working pressure of the decarbonization device 300, thereby affecting the removal effect of the decarbonization device 300 on the carbon element in the exhaust gas.

[0047] Furthermore, by providing the decarbonization mechanism 210, the working pressure of the decarbonization device 300 can be reduced, and there is no need to regularly replace the absorber in the decarbonization device 300, thereby reducing the overall maintenance cost of the system.

[0048] See also Figure 1 to Figure 2 In one embodiment, the decarbonization mechanism 210 further has a fourth gas outlet 213 connected to the third gas inlet 211 , and the fourth gas outlet 213 is connected to the second gas inlet 310 .

[0049] When the carbon removal device 300 removes carbon from the exhaust gas after hydrogen removal, a certain amount of oxygen is required. With such a configuration, the outside air can enter the decarbonization mechanism 210 through the third air inlet port 211, and then directly flow to the second air inlet port 310 through the fourth air outlet port 213 and enter the carbon removal device 300, thereby providing oxygen for the carbon removal work of the carbon removal device 300 and ensuring the reliability of the effect of the carbon removal device 300 in decarbonizing the exhaust gas.

[0050] It is understandable that, in the above embodiment, the decarbonization mechanism 210 can perform preliminary removal of carbon dioxide in the air to reduce the working pressure of the decarbonization device 300 and affect the removal effect of the decarbonization device 300 on the carbon element in the exhaust gas.

[0051] See also Figure 1 to Figure 2 In one embodiment, the nuclear power plant waste gas treatment system also includes a second return pipe 700, the second return pipe 700 has a third return port 710 and a fourth return port 720 that are connected, the third return port 710 is connected to the second gas outlet end 320, and the fourth return port 720 is connected to at least one of the first gas inlet end 110, the second gas inlet end 310 and the third gas inlet end 211.

[0052] With such arrangement, the exhaust gas after decarbonization by the decarbonization device 300 can enter at least one of the dehydrogenation device 100, the decarbonization device 300 or the decarbonization mechanism 210. The exhaust gas after decarbonization by the decarbonization device 300 has a lower oxygen content and a higher nitrogen content. Therefore, the exhaust gas after decarbonization is transported to the dehydrogenation device 100 or the decarbonization device 300, so as to dilute the oxygen involved in the reaction, prevent the occurrence of explosion, and improve the safety of exhaust gas treatment.

[0053] In addition, by setting the second reflow pipe 700 to be connected with the first air inlet end 110, when the first reflow pipe 500 fails, the second reflow pipe 700 can also transmit the decarbonized exhaust gas to the dehydrogenation mechanism to dilute the oxygen participating in the reaction to prevent the occurrence of explosion. At the same time, when the system fails or needs to be repaired, the first air inlet end 110 stops the entry of hydrogen-containing exhaust gas, so that the decarbonized exhaust gas in the second reflow pipe 700 circulates. After a period of time, the radioactive gas remaining in the system can be cleared, thereby avoiding the leakage of radioactive gas during the maintenance process and reducing the safety hazard of a large amount of high-concentration hydrogen remaining in the system.

[0054] See also Figure 1 to Figure 2 In one embodiment, the second reflux pipeline 700 is further provided with a second reflux pump 730 , and the second reflux pump 730 is used to transport the exhaust gas from the third reflux port 710 to the fourth reflux port 720 .

[0055] By setting up a second reflux pump 730, the waste gas after decarbonization is transported from the first reflux port 510 to the second reflux port 520, and then enters the dehydrogenation device 100 or the decarbonation device 300 through the first air inlet end 110, thereby reducing the concentration of oxygen and hydrogen in the dehydrogenation device 100 or the decarbonation device 300. The structure is simple and the transportation process is reliable, which prevents the occurrence of explosion and improves the safety of waste gas treatment.

[0056] Optionally, there may be one or more second reflux pumps 730 , which is not specifically limited here.

[0057] In one embodiment, the carbon removal device 300 includes a second mixing mechanism, a second heating mechanism, a second reaction mechanism, a second condensing mechanism and a carbon dioxide absorption mechanism connected in sequence. The second mixing mechanism is used to uniformly mix the air and the exhaust gas after dehydrogenation. The second heating mechanism is used to heat the mixed air and the exhaust gas after dehydrogenation to reach the optimal temperature for catalytic oxidation and increase the speed of catalytic oxidation. The second reaction mechanism can absorb the carbon dioxide in the exhaust gas. 14 C reacts with oxygen in the air to produce 14 CO 2 The first condensing mechanism condenses the water generated by the reaction to generate liquid water, and the carbon dioxide absorption mechanism absorbs the generated 14 CO 2 Absorption to ensure that the exhaust gas does not pollute the environment.

[0058] As an explanation, in the actual exhaust gas treatment process, whether it is catalytic oxidation of hydrogen in the exhaust gas or 14 C catalytic oxidation requires an appropriate amount of oxygen to participate in the reaction. When the oxygen content is higher than 6%, the hydrogen concentration needs to be controlled below 1% to avoid explosion. Especially when the exhaust gas treatment system is just started, the oxygen content is high. If the hydrogen content in the exhaust gas exceeds 1%, the exhaust gas to be treated needs to be diluted.

[0059] See also Figure 1 to Figure 2 In one embodiment, the first reflux pipeline 500 is provided with a first reflux valve 540 , and the first reflux valve 540 is used to control the flow of the first reflux pipeline 500 .

[0060] The first reflux valve 540 can control the first reflux pipe 500. When the hydrogen concentration in the exhaust gas is high, the first reflux pipe 500 is opened through the first reflux valve 540, and the exhaust gas after dehydrogenation is transported to the first air inlet end 110 through the first reflux pipe 500 to reduce the hydrogen concentration of the exhaust gas in the dehydrogenation device 100. When the hydrogen content in the exhaust gas is low, it is not necessary to transport the exhaust gas after dehydrogenation to the first air inlet end 110. At this time, the first reflux pipe 500 is closed to prevent exhaust gas leakage. The first reflux valve 540 can also control the flow rate in the first reflux pipe 500 to control the flow rate of the exhaust gas after dehydrogenation entering the first air inlet end 110 to prevent the dehydrogenation device 100 from exploding. Such a setting has a simple structure and a reliable process, can prevent the occurrence of explosions, and improves the safety of exhaust gas treatment.

[0061] See also Figure 1 to Figure 2In one embodiment, the first outlet end 120 is provided with a first branch and a second branch, the first branch is connected to the first return pipe 500, and the second branch is connected to the second air inlet end 310 of the decarbonization device 300; in this way, the exhaust gas after dehydrogenation treatment can flow to the first return pipe 500 through the first branch, and can also flow to the decarbonization device 300 through the second branch, the structure is simple and the flow process is reliable.

[0062] Furthermore, the second branch is provided with a first branch valve 121, and the first branch valve 121 can open or close the second branch to control whether the exhaust gas after dehydrogenation can flow in the second branch.

[0063] See also Figure 1 to Figure 2 As an embodiment that can be implemented simultaneously with the above-mentioned embodiment, the second reflux pipeline 700 is provided with a second reflux valve 740 , and the second reflux valve 740 is used to control the flow of the second reflux pipeline 700 .

[0064] The second return valve 740 can open or close the second return pipe 700. When the hydrogen concentration or oxygen concentration in the exhaust gas is high, the second return pipe 700 is opened and the flow rate of the second return pipe 700 is increased through the second return valve 740, and the decarbonized exhaust gas is transported to at least one of the first air inlet end 110, the second air inlet end 310 or the third air inlet end 211 through the second return pipe 700 to reduce the hydrogen and oxygen concentrations of the exhaust gas in the dehydrogenation device 100 and the decarbonization device 300. When the hydrogen concentration and oxygen concentration in the exhaust gas are low, the flow rate of the second return pipe 700 is reduced or the second return pipe 700 is closed. The second return valve 740 can also control the flow rate in the second return pipe 700 to control the flow rate of the decarbonized exhaust gas entering the first air inlet end 110, thereby preventing the dehydrogenation device 100 from exploding. Such a configuration has a simple structure and a reliable process, can prevent the occurrence of explosions, and improves the safety of exhaust gas treatment.

[0065] See also Figure 1 to Figure 2 In one embodiment, the second gas outlet 320 is provided with a third branch and a fourth branch, the third branch is connected to the second return pipe 700, and the fourth branch is connected to the exhaust device 400. With such a configuration, the exhaust gas after carbon removal can be retained in the second return pipe 700 through the third branch, and can also flow to the exhaust device 400 through the fourth branch. The structure is simple and the flow process is reliable.

[0066] Furthermore, the fourth branch is provided with a second branch valve 321, and the second branch valve 321 can open or close the fourth branch to control the exhaust gas after carbon removal to flow in the fourth branch.

[0067] Furthermore, the fourth branch is also provided with a hydrogen-carbon sampler, which is used to sample and test the concentrations of radioactive hydrogen and carbon elements in the waste gas after treatment to ensure whether the waste gas meets the standards.

[0068] See also Figure 1 to Figure 2 In one embodiment, the decarbonization mechanism 210 also includes a first connecting pipe 220 and a second connecting pipe 230, one end of the first connecting pipe 220 is connected to the third gas outlet end 212, the other end of the first connecting pipe 220 is connected to the first gas inlet end 110, one end of the second connecting pipe 230 is connected to the third gas outlet end 212, and the other end of the second connecting pipe 230 is connected to the second gas inlet end 310.

[0069] The air decarbonized by the decarbonization mechanism 210 can enter the dehydrogenation device 100 through the first connecting pipe 220 and the decarbonation device 300 through the second connecting pipe 230, so that air can be added to both the dehydrogenation and decarbonization processes of the exhaust gas to enable the dehydrogenation reaction and the decarbonization reaction to proceed normally.

[0070] Furthermore, the first connecting pipe 220 is provided with a first connecting valve 221, and the second connecting pipe 230 is provided with a second connecting valve 231. The first connecting valve 221 can open or close the first connecting pipe 220, and the second connecting valve 231 can open or close the second connecting pipe 230. With such a configuration, the conductivity of the first connecting pipe 220 and the second connecting pipe 230 can be flexibly controlled, and the process is convenient and the implementation cost is low.

[0071] Furthermore, the first connecting valve 221 and the second connecting valve 231 are flow control valves. In this way, the air intake can be adjusted through the first connecting valve 221 according to the current hydrogen concentration, oxygen concentration and reaction temperature in the dehydrogenation device 100 to prevent the hydrogen concentration or oxygen concentration in the dehydrogenation device 100 from being too high and causing an explosion. The air intake can also be adjusted through the second connecting valve 231 according to the current methane concentration, oxygen concentration and reaction temperature in the decarbonation device 300 to prevent the methane concentration and oxygen concentration in the decarbonation device 300 from being too high or too low and causing a problem of low reaction efficiency.

[0072] See also Figure 1 to Figure 2 In one embodiment, the decarbonization mechanism 210 further includes an air intake pump 240 , which is disposed at the third air intake end 211 and is used to transport air to the third air intake end 211 .

[0073] By setting up an air intake pump 240, external air is transported from the third air intake end 211 to the decarbonization mechanism 210, thereby reducing the concentration of oxygen and hydrogen in the dehydrogenation device 100 or the decarbonization device 300. The structure is simple and the transportation process is reliable, which prevents the occurrence of explosions and improves the safety of waste gas treatment.

[0074] See also Figure 1 to Figure 2 In one embodiment, the intake device 200 further includes a first intake pipe 250 and a first intake valve 251. One end of the first intake pipe 250 is used to be arranged in the exhaust gas storage device 600, and the other end of the first intake pipe 250 is arranged at the first intake end 110. The first intake valve 251 is arranged in the first intake pipe 250 and is used to control the flow of the first intake pipe 250.

[0075] The exhaust gas in the exhaust gas storage device 600 flows to the first exhaust port 110 through the first exhaust pipe 250 and enters the dehydrogenation device 100. The first exhaust valve 251 can open or close the first exhaust pipe 250 to control whether the exhaust gas can enter the dehydrogenation device 100. When the exhaust gas treatment system of the nuclear power plant is in operation, the first exhaust valve 251 is opened, and the exhaust gas enters the dehydrogenation device 100 through the first exhaust pipe 250. When the exhaust gas treatment system of the nuclear power plant is shut down, the first exhaust valve 251 is closed to ensure the airtightness of the exhaust gas treatment system of the nuclear power plant.

[0076] Furthermore, the first air intake valve 251 is a flow regulating valve, so that the intake amount of the exhaust gas can be adjusted according to the current hydrogen concentration, oxygen concentration and reaction temperature in the dehydrogenation device 100 to prevent the hydrogen concentration or oxygen concentration in the dehydrogenation device 100 from being too high and causing an explosion; in addition, if the oxygen concentration and hydrogen concentration in the current dehydrogenation device 100 are low, the first air intake valve 251 can be appropriately adjusted to increase the exhaust gas intake amount of the first air intake valve 251 to improve the exhaust gas treatment efficiency.

[0077] See also Figure 1 to Figure 2 The air intake device 200 also includes a second air intake pipe 260 and a second air intake valve 261. One end of the second air intake pipe 260 is used to communicate with the outside, and the other end of the second air intake pipe 260 is arranged at the third air intake end 211. The second air intake valve 261 is arranged in the second air intake pipe 260 and is used to control the flow of the second air intake pipe 260.

[0078] The outside air flows to the third air inlet end 211 through the second air inlet pipe 260 and enters the decarbonization mechanism 210. The second air inlet valve 261 can open or close the second air inlet pipe 260 to control whether the air can enter the decarbonization mechanism 210. When the nuclear power plant exhaust gas treatment system is running, the second air inlet valve 261 is opened, and the air enters the decarbonization mechanism 210 through the second air inlet pipe 260. When the nuclear power plant exhaust gas treatment system is shut down, the second air inlet valve 261 is closed to ensure the airtightness of the nuclear power plant exhaust gas treatment system.

[0079] Furthermore, the second air intake valve 261 is a flow regulating valve, so that the air intake volume can be adjusted according to the current hydrogen concentration, oxygen concentration and reaction temperature in the dehydrogenation device 100 to prevent the hydrogen concentration or oxygen concentration in the dehydrogenation device 100 from being too high and causing an explosion.

[0080] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A nuclear power plant exhaust gas treatment system, characterized in that: include: A dehydrogenation device, the dehydrogenation device having a first gas inlet end and a first gas outlet end connected to each other; an air intake device, the air intake device being used to deliver exhaust gas and air to the first air intake end; A carbon removal device, the carbon removal device having a second air inlet end and a second air outlet end connected to each other, the second air inlet end being connected to the first air outlet end; an exhaust device, the exhaust device being in communication with the second air outlet end; as well as, The first return pipe has a first return port and a second return port connected to each other, the first return port is connected to the first air outlet, and the second return port is connected to the first air inlet.

2. The nuclear power plant exhaust gas treatment system according to claim 1, characterized in that: The first reflux pipeline is also provided with a first reflux pump, and the first reflux pump is used to transport the exhaust gas from the first reflux port to the second reflux port.

3. The nuclear power plant exhaust gas treatment system according to claim 1, characterized in that: The air intake device includes a decarbonization mechanism, which has a third air intake end and a third air outlet end that are connected. The third air intake end is used to communicate with the outside, and the third air outlet end is connected to the first air intake end. The air enters the first air intake end after passing through the decarbonization mechanism.

4. The nuclear power plant exhaust gas treatment system according to claim 3, characterized in that: The decarburization mechanism further comprises a fourth gas outlet connected to the third gas inlet, and the fourth gas outlet is connected to the second gas inlet.

5. The nuclear power plant exhaust gas treatment system according to claim 4, characterized in that: The nuclear power plant exhaust gas treatment system also includes a second return pipe, which has a third return port and a fourth return port that are connected. The third return port is connected to the second gas outlet end, and the fourth return port is connected to at least one of the first gas inlet end, the second gas inlet end and the third gas inlet end.

6. The nuclear power plant exhaust gas treatment system according to claim 5, characterized in that: The second reflux pipeline is also provided with a second reflux pump, and the second reflux pump is used to transport the exhaust gas from the third reflux port to the fourth reflux port.

7. The nuclear power plant exhaust gas treatment system according to claim 5, characterized in that: The first reflux pipeline is provided with a first reflux valve, and the first reflux valve is used to control the flow of the first reflux pipeline; or / and, The second reflux pipeline is provided with a second reflux valve, and the second reflux valve is used to control the flow of the second reflux pipeline.

8. The nuclear power plant exhaust gas treatment system according to claim 4, characterized in that: The decarbonization mechanism also includes a first connecting pipe and a second connecting pipe, one end of the first connecting pipe is connected to the third gas outlet end, the other end of the first connecting pipe is connected to the first gas inlet end, one end of the second connecting pipe is connected to the third gas outlet end, and the other end of the second connecting pipe is connected to the second gas inlet end.

9. The nuclear power plant exhaust gas treatment system according to claim 3, characterized in that: The decarburization mechanism further includes an air intake pump, which is disposed at the third air intake end and is used to transport the air to the third air intake end.

10. The nuclear power plant exhaust gas treatment system according to claim 3, characterized in that: The air intake device further comprises a first air intake pipe and a first air intake valve, one end of the first air intake pipe is used to be arranged in the exhaust gas storage device, the other end of the first air intake pipe is arranged at the first air intake end, and the first air intake valve is arranged in the first air intake pipe and is used to control the flow of the first air intake pipe; or / and, The air intake device also includes a second air intake pipe and a second air intake valve, one end of the second air intake pipe is used to communicate with the outside, the other end of the second air intake pipe is arranged at the third air intake end, and the second air intake valve is arranged in the second air intake pipe and is used to control the flow of the second air intake pipe.

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