Sampling device

Abstract

The utility model relates to a sampling device which comprises a gas inlet assembly with a gas inlet cavity and a reaction assembly with a reaction cavity, the gas inlet assembly is provided with a first gas inlet and a first gas outlet which are communicated with the gas inlet cavity, and the first gas inlet is used for allowing reaction gas to flow in; the reaction assembly is provided with a second exhaust port and a second gas inlet which are communicated with the reaction cavity, a catalyst bearing part is arranged in the reaction cavity and used for containing a catalyst capable of carrying out catalytic reaction with reaction gas, the preheating assembly is provided with a heating cavity, and the first exhaust port and the second gas inlet are both communicated with the heating cavity and the heat conduction part; the preheating assembly extends towards the interior of the heating cavity from the cavity wall of the heating cavity, and the heating coil is wound on the peripheral face of the preheating assembly and used for heating the preheating assembly. According to the sampling device, even if the flow rate of the sampled gas is high, the temperature of the periphery and the center of the gas can be basically consistent, and the catalyst fully reacts with the gas.

Description

Technical Field

[0001] The present application relates to the field of nuclear power equipment, and in particular to a sampling device. Background Art

[0002] Nuclear power plants are facilities that convert nuclear energy into electrical energy through appropriate devices. They have been further promoted in recent years because they do not emit huge amounts of pollutants that cause air pollution like fossil fuel power generation. According to relevant regulations, the concentrations of tritium and carbon in airborne effluents and ambient air are considered key indicators for evaluating the environment of nuclear power plants. Usually, workers are required to use tritium and carbon sampling devices to sample tritium and carbon in airborne effluents and ambient air in order to effectively monitor tritium and carbon.

[0003] The oxidation catalytic tube is the core component of the tritium and carbon sampling device. In the related art, the two ends of the oxidation catalytic tube are respectively an air inlet and an air outlet, and the tube body is provided with a number of hollow spheres for setting catalysts. When the gas flow rate through the catalytic oxidation tube is high, the problem of the catalyst not being able to fully react with the gas is likely to occur. Summary of the invention

[0004] Based on this, it is necessary to provide a sampling device to address the problem that when the gas flow rate through the existing catalytic oxidation tube is high, the catalyst is prone to fail to react fully with the gas.

[0005] A sampling device, comprising:

[0006] An air intake assembly having an air intake cavity, wherein the air intake assembly is provided with a first air intake port and a first air exhaust port connected to the air intake cavity, wherein the first air intake port is used for reactant gas to flow in;

[0007] A reaction assembly having a reaction chamber, wherein the reaction assembly is provided with a second exhaust port and a second air inlet connected to the reaction chamber, and a catalyst carrier is provided in the reaction chamber, wherein the catalyst carrier is used to place a catalyst capable of catalytically reacting with the reaction gas;

[0008] A preheating assembly having a heating chamber, wherein the first exhaust port and the second air inlet are both connected to the heating chamber;

[0009] A heat conducting member extending from the cavity wall of the heating cavity toward the cavity;

[0010] A heating coil is wound around the outer circumference of the preheating component to heat the preheating component.

[0011] In one embodiment, a plurality of the heat conducting members are arranged at intervals along the circumference of the heating chamber.

[0012] In one embodiment, the first exhaust port is a tapered hole, the large end of the tapered hole faces the preheating assembly, and the small end of the tapered hole faces the air inlet cavity.

[0013] In one embodiment, a third air inlet hole is provided at one end of the preheating assembly close to the air inlet assembly, the first exhaust port is connected to the heating chamber through the third air inlet hole, and the diameter of the third air inlet hole is the same as the diameter of the large end of the conical hole.

[0014] In one embodiment, a third exhaust hole is provided at one end of the preheating component close to the reaction component, the heating chamber is connected to the second air inlet through the third exhaust hole, and the diameter of the third exhaust hole is not less than the diameter of the heating chamber.

[0015] In one embodiment, the reaction assembly includes a shell and a sleeve, the second air inlet is opened in the shell, one end of the sleeve is connected to the second air inlet, and the other end is connected to the third exhaust hole.

[0016] In one embodiment, the catalyst carrier partially extends from the reaction chamber into the sleeve, and a stopper is provided at one end of the catalyst carrier away from the preheating assembly. The diameter of the stopper is larger than the diameter of the second air inlet, so as to limit the catalyst carrier from leaving the reaction chamber through the second air inlet under the action of its own gravity.

[0017] In one embodiment, the reaction component also includes a cover body, and the shell and the cover body together form the reaction chamber. An elastic member is provided between the cover body and the catalyst carrier, and the elastic member is in a compressed state, and one end of the elastic member abuts against the cover body, and the other end abuts against the stop member.

[0018] In one of the embodiments, a sealing gasket is provided between the shell and the cover.

[0019] In one embodiment, a fastener is included, and the fastener passes through the shell and the cover in sequence to connect the two.

[0020] When the sampling device is working, the gas enters the air inlet cavity through the first air inlet, and then flows through the heating cavity from the first exhaust port. Since the preheating component is provided with a heat-conducting member extending from the cavity wall of the heating cavity toward the cavity, when the high-speed gas enters the heating cavity, since the heat-conducting member extends toward the center of the gas, the heating coil heats the preheating component, and the preheating component heats up, wherein the cavity wall of the heating cavity heats the surrounding of the gas, and the heat-conducting member heats the center of the gas, so that the surrounding and center of the gas are heated synchronously, thereby achieving that the temperature of the surrounding and center of the gas after heating is basically the same, and the gas heated by the preheating component enters the reaction component through the second air inlet. Since the degree of reaction between the catalyst and the gas is related to the temperature of the gas, when the temperature of the surrounding and center of the gas is basically the same, the surrounding and center of the gas fully react with the catalyst in the catalyst carrier in the reaction cavity, and finally leave the reaction cavity through the second exhaust port. In summary, the sampling device can ensure that the temperature of the surrounding and center of the gas is basically the same even if the sampling gas flow rate is high, and the catalyst and the gas fully react. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a sampling device in one embodiment of the present application;

[0022] Figure 2 For this application Figure 1 A schematic diagram of the structure of the middle air intake assembly;

[0023] Figure 3 For this application Figure 1 A schematic diagram of the structure of the preheating component;

[0024] Figure 4 For this application Figure 1 Schematic diagram of the structure of the middle shell.

[0025] Reference numerals:

[0026] Air intake assembly 100, air intake cavity 110, first air intake port 120, first air exhaust port 130;

[0027] Preheating assembly 200, heating chamber 210, heat conducting member 220, third air inlet 230, third air outlet 240;

[0028] Reaction assembly 300, reaction chamber 310, second exhaust port 320, second air inlet 330, catalyst support 340, shell 350, cover 360, sleeve 370, stopper 380, elastic member 390;

[0029] Heating coil 400;

[0030] Sealing pad 500;

[0031] Fastener 600. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] See also Figure 1 , Figure 1 The schematic diagram of the structure of the sampling device in one embodiment of the present application is shown. The sampling device provided in one embodiment of the present application includes: an air intake component 100, a preheating component 200, a reaction component 300 and a heating coil 400. The air intake component 100 has an air intake cavity 110, and the air intake component 100 is provided with a first air intake port 120 and a first exhaust port 130 connected to the air intake cavity 110, and the first air intake port 120 is used for the reaction gas to flow in. The reaction component 300 has a reaction cavity 310, and the reaction component 300 is provided with a second exhaust port 320 and a second air intake port 330 connected to the reaction cavity 310, and a catalyst carrier 340 is provided in the reaction cavity 310, and the catalyst carrier 340 is used to place a catalyst that can catalytically react with the reaction gas. The preheating component 200 has a heating cavity 210, and the first exhaust port 130 and the second air intake port 330 are both connected to the heating cavity 210. The heat conducting member 220 extends from the cavity wall of the heating cavity 210 toward the cavity. The heating coil 400 is wound around the outer circumference of the preheating assembly 200 to heat the preheating assembly 200 .

[0039] In this embodiment, when the sampling device is working, the gas enters the gas inlet cavity 110 through the first gas inlet port 120, and then flows through the heating cavity 210 from the first gas outlet port 130. Since the preheating assembly 200 is provided with a heat-conducting member 220 extending from the cavity wall of the heating cavity 210 toward the cavity, when the high-speed gas enters the heating cavity 210, the heat-conducting member 220 extends toward the center of the gas, and the heating coil 400 heats the preheating assembly 200, and the preheating assembly 200 is heated, wherein the cavity wall of the heating cavity 210 heats the surrounding of the gas, and the heat-conducting member 220 heats the center of the gas. Heat is applied to the gas so that the surrounding and center of the gas are heated synchronously, thereby achieving that the temperatures of the surrounding and center of the gas are basically the same after heating. The gas heated by the preheating component 200 enters the reaction component 300 through the second air inlet 330. Since the degree of reaction between the catalyst and the gas is related to the temperature of the gas, when the temperatures of the surrounding and center of the gas are basically the same, the surrounding and center of the gas fully react with the catalyst in the catalyst carrier 340 in the reaction chamber 310, and finally leave the reaction chamber 310 through the second exhaust port 320. In summary, the above-mentioned sampling device can ensure that the temperatures of the surrounding and center of the gas are basically the same even if the sampling gas flow rate is high, and the catalyst and the gas fully react.

[0040] See also Figure 1 and Figure 3 In some embodiments, a plurality of heat conducting members 220 are arranged at intervals along the circumference of the heating chamber 210 .

[0041] In this embodiment, the gas flows from the first exhaust port 130 through the gap between every two adjacent heat-conducting members 220 in the heating chamber 210. Each heat-conducting member 220 is heated by the heating coil 400 and releases heat to the gas flowing along its surface. By arranging a plurality of heat-conducting members 220 at intervals along the circumference of the heating chamber 210, the gas temperature at each position in the heating chamber 210 is substantially the same.

[0042] See also Figure 1 and Figure 2 In some embodiments, the first exhaust port 130 is a tapered hole, the large end of the tapered hole faces the preheating assembly 200 , and the small end of the tapered hole faces the air intake cavity 110 .

[0043] In this embodiment, during operation, since the gas in the air inlet cavity 110 is discharged through the first exhaust port 130 and the diameter of the first exhaust port 130 gradually increases along the gas flow direction, the flow rate of the gas when entering the heating cavity 210 is lower than the flow rate when leaving the air inlet cavity 110, thereby reducing the flow rate of the gas entering the heating cavity 210. On the one hand, the time for the gas to be heated in the heating cavity 210 is prolonged. On the other hand, when the gas flow rate is reduced, the gas flow rates in the cavity and the cavity wall of the heating cavity 210 are basically the same, so that the gas in the cavity and the cavity wall of the heating cavity 210 are heated for the same time under the action of the heat conductor 220, thereby achieving that each part of the gas entering the heating cavity 210 is heated to the same temperature.

[0044] In some embodiments, the air intake assembly 100 and the preheating assembly 200 are welded together.

[0045] See also Figure 1 and Figure 3 In some embodiments, a third air inlet hole 230 is provided at one end of the preheating assembly 200 close to the air inlet assembly 100, and the first exhaust port 130 is connected to the heating chamber 210 through the third air inlet hole 230. The diameter of the third air inlet hole 230 is the same as the diameter of the large end of the tapered hole.

[0046] In this embodiment, during operation, by setting a third air inlet hole 230, the diameter of the third air inlet hole 230 is the same as the diameter of the large end of the tapered hole, so that after the gas leaves the air inlet cavity 110 and before entering the heating cavity 210, there is a buffering and deceleration process in the third air inlet hole 230, so as to further reduce the flow rate of the gas after leaving the air inlet cavity 110, so that the flow rate of the gas entering the heating cavity 210 is further reduced.

[0047] In some embodiments, the diameter of the third air inlet hole 230 is not less than the diameter of the heating cavity 210 .

[0048] See also Figure 1 and Figure 3 In some embodiments, a third exhaust hole 240 is provided at one end of the preheating component 200 close to the reaction component 300, and the heating chamber 210 is connected to the second air inlet 330 through the third exhaust hole 240, and the diameter of the third exhaust hole 240 is not less than the diameter of the heating chamber 210.

[0049] In this embodiment, during operation, the gas flows out from the heating chamber 210 and enters the second air inlet 330 through the third exhaust hole 240. Since the diameter of the third exhaust hole 240 is not less than the diameter of the heating chamber 210, the flow rate of the gas is reduced when entering the third exhaust hole 240, and the flow rate of the gas when entering the second air inlet 330 is lower than the flow rate when flowing out from the heating chamber 210. The gas with reduced flow rate slowly enters the second air inlet 330 and fully reacts with the catalyst in the catalyst carrier 340.

[0050] See also Figure 1 , Figure 3 and Figure 4 In some embodiments, the reaction assembly 300 includes a shell 350 and a sleeve 370 . The second air inlet 330 is opened in the shell 350 . One end of the sleeve 370 is connected to the second air inlet 330 , and the other end is connected to the third exhaust hole 240 .

[0051] In this embodiment, during operation, by setting the sleeve 370, after the gas leaves the third exhaust hole 240 of the heating chamber 210 and before entering the second air inlet 330 of the shell 350, there is a buffering and deceleration process in the sleeve 370, so as to further reduce the flow rate of the gas after leaving the third exhaust port 230, so that the flow rate of the gas entering the second air inlet 330 is further reduced.

[0052] In some embodiments, the inner diameter of the sleeve 370 is not less than the diameter of the third exhaust hole 240 and the diameter of the second air inlet 330 .

[0053] In some embodiments, one end of the sleeve 370 is welded to the preheating assembly 200 , and the other end is welded to the shell 350 .

[0054] See also Figure 1 and Figure 4 In some embodiments, the catalyst carrier 340 partially extends from the reaction chamber 310 into the sleeve 370, and a stop member 380 is provided at one end of the catalyst carrier 340 away from the preheating assembly 200. The diameter of the stop member 380 is larger than the diameter of the second air inlet 330, so as to limit the catalyst carrier 340 from leaving the reaction chamber 310 from the second air inlet 330 under the action of its own gravity.

[0055] In the present embodiment, during operation, the catalyst carrier 340 extends into the sleeve 370 under the action of its own gravity. A stop member 380 is provided at one end of the catalyst carrier 340 away from the preheating assembly 200. When the catalyst carrier 340 gradually extends into the sleeve 370, the stop member 380 is driven by the catalyst carrier 340 to approach the second air inlet 330 along the axial direction of the sleeve 370, and since the diameter of the stop member 380 is greater than the diameter of the second air inlet 330, the stop member 380 is blocked at one end of the second air inlet 330 close to the reaction chamber 310, and the catalyst carrier 340 cannot be fully extended into the sleeve 370 under the action of its own gravity, thereby facilitating the staff to remove the catalyst carrier 340 from the sleeve 370 to regularly replace the catalyst in the catalyst carrier 340.

[0056] In some embodiments, the gas in the sleeve 370 enters the catalyst support 340 from one end of the catalyst support 340 close to the preheating assembly 200, and reacts with the catalyst placed in the catalyst support 340. The reacted gas leaves the catalyst support 340 from one end of the catalyst support 340 away from the preheating assembly 200, enters the reaction chamber 310, and leaves the reaction chamber 310 through the second exhaust port 320.

[0057] See also Figure 1 and Figure 4 In some embodiments, the reaction component 300 also includes a cover body 360, and the shell 350 and the cover body 360 together form a reaction chamber 310. An elastic member 390 is provided between the cover body 360 and the catalyst carrier 340. The elastic member 390 is in a compressed state, and one end of the elastic member 390 abuts against the cover body 360, and the other end abuts against the stop member 380.

[0058] In this embodiment, when working, the elastic member 390 generates an elastic force F from the cover body 360 toward the stop member 380, and the elastic force F causes the stop member 380 to press against one end of the second air inlet 330 close to the reaction chamber 310, thereby limiting the position of the catalyst carrier 340 in the sleeve 370 to prevent the catalyst carrier 340 from partially or completely withdrawing from the sleeve 370 and entering the reaction chamber 310 under the push of the gas pressure in the sleeve 370.

[0059] In other embodiments, an elastic member 390 is disposed between the shell 350 and the catalyst support 340 . The elastic member 390 is in a natural or stretched state, and one end of the elastic member 390 abuts against the shell 350 , and the other end abuts against the stop member 380 .

[0060] See also Figure 1 In some embodiments, a sealing gasket 500 is provided between the shell 350 and the cover 360 .

[0061] In this embodiment, during operation, the annular channel between the shell 350 and the cover 360 is blocked by the sealing gasket 500, and the gas entering the reaction chamber 310 can only leave from the second exhaust port 320 and cannot leak to the outside from the annular channel between the shell 350 and the cover 360.

[0062] See also Figure 1 In some embodiments, a fastener 600 is included, and the fastener 600 passes through the housing 350 and the cover 360 in sequence to connect the two.

[0063] In this embodiment, during operation, the shell 350 and the cover 360 are connected by providing a fastener 600, so that the staff can quickly disassemble the shell 350 and the cover 360.

[0064] 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.

[0065] 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 sampling device, characterized in that: The sampling device comprises: An air intake component (100) has an air intake cavity (110), the air intake component (100) is provided with a first air intake port (120) and a first air exhaust port (130) which are connected to the air intake cavity (110), the first air intake port (120) being used for reactant gas to flow in; A reaction component (300) having a reaction chamber (310), wherein the reaction component (300) is provided with a second exhaust port (320) and a second air inlet (330) which are connected to the reaction chamber (310), and a catalyst carrier (340) is provided in the reaction chamber (310), wherein the catalyst carrier (340) is used to place a catalyst capable of generating a catalytic reaction with the reaction gas; A preheating assembly (200) having a heating chamber (210), wherein the first exhaust port (130) and the second air inlet (330) are both connected to the heating chamber (210); A heat conducting member (220) extending from a cavity wall of the heating cavity (210) toward the cavity; A heating coil (400) is wound around the outer peripheral surface of the preheating component (200) to heat the preheating component (200).

2. The sampling device according to claim 1, characterized in that: The plurality of heat conducting members (220) are arranged at intervals along the circumference of the heating chamber (210).

3. The sampling device according to claim 2, characterized in that: The first exhaust port (130) is a tapered hole, the large end of the tapered hole faces the preheating component (200), and the small end of the tapered hole faces the air intake cavity (110).

4. The sampling device according to claim 3, characterized in that: A third air inlet hole (230) is provided at one end of the preheating component (200) close to the air inlet component (100); the first exhaust port (130) is connected to the heating chamber (210) through the third air inlet hole (230); and the diameter of the third air inlet hole (230) is the same as the diameter of the large end of the tapered hole.

5. The sampling device according to claim 1, characterized in that: A third exhaust hole (240) is provided at one end of the preheating component (200) close to the reaction component (300); the heating chamber (210) and the second air inlet (330) are connected via the third exhaust hole (240); and the diameter of the third exhaust hole (240) is not less than the diameter of the heating chamber (210).

6. The sampling device according to claim 5, characterized in that: The reaction assembly (300) comprises a shell (350) and a sleeve (370); the second air inlet (330) is opened in the shell (350); one end of the sleeve (370) is connected to the second air inlet (330), and the other end is connected to the third exhaust hole (240).

7. The sampling device according to claim 6, characterized in that: The catalyst carrier (340) partially extends from the reaction chamber (310) into the sleeve (370), and a stopper (380) is provided at one end of the catalyst carrier (340) facing away from the preheating component (200). The diameter of the stopper (380) is larger than the diameter of the second air inlet (330) so as to limit the catalyst carrier (340) from leaving the reaction chamber (310) from the second air inlet (330) under the action of its own gravity.

8. The sampling device according to claim 7, characterized in that: The reaction component (300) also includes a cover body (360), the shell (350) and the cover body (360) together form the reaction chamber (310), an elastic member (390) is provided between the cover body (360) and the catalyst carrier (340), the elastic member (390) is in a compressed state, and one end of the elastic member (390) abuts against the cover body (360), and the other end abuts against the stop member (380).

9. The sampling device according to claim 8, characterized in that: A sealing gasket (500) is provided between the shell (350) and the cover (360).

10. The sampling device according to claim 8, characterized in that: It comprises a fastener (600), wherein the fastener (600) passes through the shell (350) and the cover (360) in sequence to connect the two.

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