Tracer gas generator and iodine adsorber performance test system

Abstract

This utility model discloses a performance testing system for a tracer gas generator and an iodine adsorber. The tracer gas generator includes a liquid storage container, an inlet pipe, an outlet pipe, and a suction unit. The liquid storage container forms a storage chamber for storing liquid tracer. The inlet pipe is connected to the liquid storage container, connecting the inside and outside of the storage chamber. The outlet pipe is connected to the liquid storage container and includes a tracer gas input end and a tracer gas output end. The tracer gas input end is connected to the storage chamber, and the tracer gas output end is used to output tracer gas. The suction unit is connected to the tracer gas output end and is used to generate suction force to allow the tracer gas in the storage chamber to escape. The negative pressure suction force generated by the suction unit allows the tracer gas in the storage chamber to escape. Since the airflow generated inside the suction unit does not directly contact the liquid tracer in the storage chamber, the risk of unvaporized droplets mixing with the tracer gas and being sucked into the iodine adsorber can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of leak detection testing equipment in the nuclear field, and in particular to a performance testing system for a tracer gas generator and an iodine adsorber. Background Technology

[0002] Iodine filters (or iodine adsorbers) are used in the ventilation systems of nuclear power plants to adsorb iodine and protect workers and the environment from its hazards. To ensure the safe and reliable operation of the nuclear air purification system and to ensure that the emission of radioactive gases from the nuclear facility's ventilation system meets the effluent emission limits required by relevant national standards, effectiveness evaluation tests must be conducted on newly installed iodine adsorbers before operation. Existing iodine adsorbers must also undergo regular on-site tests during operation to evaluate their functional effectiveness. The cyclohexane method is an advanced technology used to detect the leakage rate of iodine adsorbers in the ventilation systems of nuclear power plants. Cyclohexane, as a non-radioactive tracer gas, is injected upstream of the ventilation system, and its concentration is measured downstream, thereby effectively measuring the leakage rate of the iodine adsorbers in the ventilation system.

[0003] To test the leakage rate of an iodine adsorber using the cyclohexane method, a specific device is needed to generate cyclohexane gas. Existing cyclohexane gas generating devices typically include a gas generation chamber containing liquid cyclohexane. The liquid cyclohexane is heated above its boiling point and completely vaporized. Compressed air is then introduced into the gas generation chamber, mixing with the liquid cyclohexane. The powerful purging action of the compressed air forces the cyclohexane gas into the iodine adsorber, achieving a pulsed injection of cyclohexane gas. However, because the compressed air is in direct contact with the liquid cyclohexane, some unvaporized cyclohexane droplets are easily blown into the iodine adsorber during purging, causing corrosion and other adverse effects. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a performance testing system for a tracer gas generator and an iodine adsorber, addressing at least one of the deficiencies mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to provide a tracer gas generator, which includes a liquid storage container, an inlet pipe, an outlet pipe and a suction unit; The liquid storage container has a storage cavity for storing liquid tracers; The air inlet pipe is connected to the liquid storage container, connecting the inside and outside of the liquid storage chamber; The gas outlet pipe is connected to the liquid storage container and includes a tracer gas input end and a tracer gas output end. The tracer gas input end is connected to the liquid storage chamber, and the tracer gas output end is used to output tracer gas. The suction unit is connected to the tracer gas output terminal and is used to generate suction force to cause the tracer gas in the liquid storage chamber to escape.

[0006] Preferably, the suction unit includes a jet pump, which includes a first air inlet, a second air inlet, and an air outlet. The first air inlet is connected to the tracer gas output terminal, the second air inlet is used to connect compressed air, and the air outlet is used to output tracer gas.

[0007] Preferably, the first air inlet and the tracer gas output are detachably connected.

[0008] Preferably, the tracer gas generator further includes a heating element disposed on the outer surface of the liquid storage container, the heating element covering the side and / or bottom surface of the liquid storage container.

[0009] Preferably, the heating element is detachably disposed on the outer surface of the liquid storage container.

[0010] Preferably, the tracer gas generator further includes a level tube, which is connected to the outer side of the liquid storage container and communicates with the liquid storage cavity to display the liquid level in the liquid storage cavity.

[0011] Preferably, the air inlet pipe includes an air inlet end and an air outlet end, the air inlet end is connected to the external atmosphere of the liquid storage chamber, the air outlet end extends into the interior of the liquid storage chamber, and the air outlet end is provided with a bubble ball; And / or, the intake pipe is provided with a filter element for filtering air; And / or, the air intake line and the liquid storage container are detachably connected.

[0012] Preferably, the tracer gas generator further includes a pressure measuring unit connected to the liquid storage container for displaying the pressure inside the liquid storage chamber.

[0013] Preferably, the liquid storage container includes a body and a cover, which together enclose the liquid storage cavity; The top of the main body has an opening for injecting liquid tracer into the liquid storage chamber, and the cover and the top of the main body are rotatably connected.

[0014] This utility model also provides an iodine adsorber performance testing system, which includes an iodine adsorber performance testing device and a tracer gas generator as described in any of the above. The iodine adsorber performance testing device includes an iodine adsorber and a tracer gas injection port. The tracer gas generator is connected to the tracer gas injection port, and the tracer gas generated by the tracer gas generator enters the iodine adsorber through the tracer gas injection port.

[0015] This invention has at least the following advantages: the suction unit and the tracer gas output end are connected, and the tracer gas in the storage chamber is released by the negative pressure suction force generated by the suction unit; since the airflow generated inside the suction unit will not directly contact the liquid tracer in the storage chamber, the risk of unvaporized droplets being mixed with the tracer gas and sucked into the iodine adsorber can be reduced. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the following will further describe this utility model in conjunction with the accompanying drawings and embodiments. In the drawings: Figure 1 This is a schematic diagram of the tracer gas generator in some embodiments of the present invention; Figure 2 This is a schematic diagram of the connection structure between the gas outlet pipe and the jet pump of the tracer gas generator in some embodiments of this utility model. Detailed Implementation

[0017] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0018] It should be noted that, unless otherwise explicitly specified and limited, terms such as "connection" and "setup" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal connection of two components or the interaction between two components. The terms "first," "second," etc., are used only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] Please see Figure 1 This invention discloses a tracer gas generator, which includes a liquid storage container 1, an inlet pipe 2, an outlet pipe 3, and a suction unit 4. This tracer gas generator is used to produce tracer gas. For example, when this tracer gas generator is applied to a performance testing device for an iodine adsorber in a nuclear power plant, cyclohexane gas is used as the tracer gas, and the tracer gas generator can be used to produce cyclohexane gas. Of course, if this tracer gas generator is applied to other equipment, the tracer gas can also be other gases.

[0020] The storage container 1 has a storage chamber 10 for storing the liquid tracer. The liquid tracer vaporizes to produce a gaseous tracer, i.e., a tracer gas. An inlet pipe 2 is connected to the storage container 1, connecting the inside and outside of the storage chamber 10. An outlet pipe 3 is connected to the storage container 1 and includes a tracer gas inlet 31 and a tracer gas outlet 32. The tracer gas inlet 31 is connected to the storage chamber 10, and the tracer gas outlet 32 ​​is used to output the tracer gas. A suction unit 4 is connected to the tracer gas outlet 32 ​​and is used to generate suction force to allow the tracer gas in the storage chamber 10 to escape.

[0021] Specifically, the storage chamber 10 includes a gas space 102 and a liquid space 101. Under normal operating conditions, the volume of the liquid tracer stored in the storage chamber 10 is smaller than the volume of the storage chamber 10. The space occupied by the liquid tracer is the liquid space 101. The gas space 102 is defined above the liquid level of the liquid tracer. After the liquid tracer vaporizes, the resulting tracer gas is located within the gas space 102. The air inlet pipe 2 connects the liquid space 101 inside the storage chamber 10 to the external atmosphere, injecting air into the liquid tracer inside the storage chamber 10 to accelerate the vaporization process; furthermore, the air inlet pipe 2, the storage chamber 10, and the air outlet pipe 3 together form a complete airflow path. Figure 1 The arrows in the diagram indicate the airflow path. The exhaust pipe 3 connects the gas space 102 inside the liquid storage chamber 10 to the suction unit 4; that is, the exhaust pipe 3 does not directly contact the liquid tracer inside the liquid storage chamber 10. Therefore, when the suction unit 4 operates, the negative pressure it generates causes the tracer gas in the gas space 102 inside the liquid storage chamber 10 to flow out through the exhaust pipe 3.

[0022] In summary, this utility model has at least the following beneficial effects: the suction unit 4 and the tracer gas output end 32 are connected, and the tracer gas in the storage chamber 10 is released by the negative pressure suction force generated by the suction unit 4; since the airflow generated inside the suction unit 4 will not directly contact the liquid tracer in the storage chamber 10, the risk of unvaporized droplets being mixed into the tracer gas and sucked into the iodine adsorber can be reduced.

[0023] like Figure 2As shown, in some embodiments, the suction unit 4 includes a jet pump, which includes a first inlet 41, a second inlet 42, and an outlet 43. The first inlet 41 is connected to the tracer gas output terminal 32, the second inlet 42 is used to receive compressed air, and the outlet 43 is used to output the tracer gas. The second inlet 42 can be connected to an air compressor. Compressed air generated by the air compressor enters the interior of the jet pump through the second inlet 42 and then flows out through the outlet 43. The compressed air, as a high-pressure working fluid, flows at high speed within the jet pump, thereby creating a low-pressure zone near the first inlet 41. This causes the tracer gas in the liquid storage chamber 10 to be drawn into the jet pump through the outlet pipe 3 and then flows out through the outlet 43. The airflow path in the jet pump is shown in the figure. Figure 2 The dotted line with an arrow indicates the method. Using a jet pump as the power source to draw out the tracer gas enables fluid transport without mechanical transmission, resulting in a simple and reliable structure. Furthermore, in some embodiments, the jet pump can be detachably connected to the outlet pipe 3; that is, the first inlet 41 and the tracer gas outlet 32 ​​are detachably connected. Thus, the jet pump and the outlet pipe 3 are independent modules that can be easily assembled and disassembled.

[0024] like Figure 1 As shown, in some embodiments, the tracer gas generator further includes a heating element 5, which is disposed on the outer surface of the liquid storage container 1. The heating element 5 is used to heat the liquid tracer in the liquid storage chamber 10, causing it to fully vaporize and generate tracer gas. The heating element 5 can be an electric heater, heating wire, or other similar components. The heating element 5 covers the sides and / or bottom of the liquid storage container 1. That is, in different embodiments, the heating element 5 may only cover the sides of the liquid storage container 1, or only cover the bottom of the liquid storage container 1, or cover both the sides and bottom of the liquid storage container 1 simultaneously. When the heating element 5 covers both the sides and bottom of the liquid storage container 1 simultaneously, the heating surface is more uniform, preventing the risk of uneven heating of the liquid tracer causing local gas to reach the explosion limit.

[0025] In some embodiments, the heating element 5 is detachably disposed on the outer surface of the liquid storage container 1. Thus, the heating element 5 and the liquid storage container 1 are independent modules that can be easily disassembled and assembled.

[0026] like Figure 1As shown, in some embodiments, the tracer gas generator further includes a liquid level tube 6, which is connected to the outer side of the liquid storage container 1 and communicates with the liquid storage cavity 10 to display the liquid level in the liquid storage cavity 10. Specifically, the liquid level tube 6 is generally U-shaped. One end of the liquid level tube 6 is connected to the upper part of the liquid storage container 1 and communicates with the gas space 102 in the liquid storage cavity 10. The other end of the liquid level tube 6 is connected to the lower part of the liquid storage container 1 and communicates with the liquid space 101 in the liquid storage cavity 10. Thus, the liquid tracer in the liquid storage cavity 10 can enter the liquid level tube 6, and the liquid level in the liquid level tube 6 is synchronized with the liquid level of the liquid tracer in the liquid storage cavity 10, thereby achieving synchronous display of the liquid level of the liquid tracer in the liquid storage cavity 10. Furthermore, to facilitate observation of the liquid level from the outside of the liquid storage container 1, the liquid level tube 6 is made of a transparent material. That is, the liquid level tube 6 is a transparent tube.

[0027] like Figure 1 As shown, in some embodiments, the liquid storage container 1 includes a main body 11 and a cover 12, which together enclose a liquid storage cavity 10. The top of the main body 11 has an opening for injecting liquid tracer into the liquid storage cavity 10, and the top of the cover 12 is rotatably connected to the top of the main body 11. Specifically, a hinge structure, such as a hinge, is provided between the top of the cover 12 and the main body 11 to achieve the hinge connection between the cover 12 and the main body 11. When liquid tracer needs to be added, the cover 12 is opened, and liquid tracer can be injected into the liquid storage cavity 10 through the opening. During the injection process, the liquid level information in the liquid storage cavity 10 can be monitored in real time by observing the liquid level displayed on the liquid level tube 6.

[0028] like Figure 1 As shown, in some embodiments, the air inlet pipe 2 includes an air inlet end 21 and an air outlet end 22. The air inlet end 21 is connected to the external atmosphere of the liquid storage chamber 10, and the air outlet end 22 extends into the interior of the liquid storage chamber 10. The air outlet end 22 is provided with a bubbling ball 23. The bubbling ball 23 is provided with a plurality of evenly distributed through holes. When the suction unit 4 is working, the negative pressure generated causes outside air to enter the liquid storage chamber 10 through the air inlet pipe 2, and is evenly dispersed into the liquid tracer through the plurality of through holes on the bubbling ball 23, producing a bubbling effect on the liquid tracer, thereby accelerating the vaporization process of the liquid tracer.

[0029] like Figure 1As shown, in some embodiments, the air intake pipe 2 is provided with a filter element 24 for filtering air. Specifically, the air intake pipe 2 includes a first air intake pipe 25 and a second air intake pipe 26, and a first valve 27 is connected between the first air intake pipe 25 and the second air intake pipe 26. The first valve 27 is used to control the flow of fluid between the first air intake pipe 25 and the second air intake pipe 26. The end of the first air intake pipe 25 away from the second air intake pipe 26 is in communication with the atmosphere. The end of the second air intake pipe 26 away from the first air intake pipe 25 serves as the air outlet 22 of the air intake pipe 2, extending into the liquid space 101 within the liquid storage chamber 10. The filter element 24 is disposed on the first air intake pipe 25.

[0030] like Figure 1 As shown, in some embodiments, a second valve 33 is provided on the gas outlet line 3. The second valve 33 is used to control the fluid flow between the gas outlet line 3 and the jet pump. When the tracer gas generator needs to be turned on, the first valve 27 and the second valve 33 can be opened; when the tracer gas generator is not working, the first valve 27 and the second valve 33 can be closed.

[0031] In some embodiments, the air intake pipe 2 and the liquid storage container 1 are detachably connected. Thus, the air intake pipe 2 and the liquid storage container 1 are two independent modules that can be easily disassembled and assembled. Similarly, the air outlet pipe 3 and the liquid storage container 1 can also be detachably connected.

[0032] like Figure 1 As shown, in some embodiments, the tracer gas generator further includes a pressure measuring unit 7, which is connected to the liquid storage container 1 and is used to display the pressure inside the liquid storage chamber 10. Specifically, the pressure measuring unit 7 may be a pressure gauge.

[0033] In some embodiments, the cover 12 of the liquid storage container 1 is provided with a first through hole, a second through hole, and a third through hole. The second air inlet pipe 26 of the air inlet pipe 2 passes through the first through hole and extends into the liquid storage chamber 10. The pressure gauge passes through the second through hole and extends into the liquid storage chamber 10. The air outlet pipe 3 is connected to the gas space 102 in the liquid storage chamber 10 through the third through hole. The air outlet pipe 3 may extend into the liquid storage chamber 10 through the third through hole or may not extend into the liquid storage chamber 10.

[0034] This invention also provides an iodine adsorber performance testing system, which includes an iodine adsorber performance testing device and a tracer gas generator according to any embodiment. The iodine adsorber performance testing device includes an iodine adsorber and a tracer gas inlet, the tracer gas generator and the tracer gas inlet are connected, and the tracer gas generated by the tracer gas generator enters the iodine adsorber through the tracer gas inlet. Specifically, the iodine adsorber performance testing device also includes a test bench, and the iodine adsorber is connected to the test bench. In some embodiments, the tracer gas inlet is located on the iodine adsorber. The outlet 43 of the jet pump of the tracer gas generator is connected to the tracer gas inlet. The tracer gas output end 32 of the outlet pipeline 3 is fluidly connected through the jet pump and the tracer gas inlet. Under the suction force provided by the jet pump, the tracer gas in the storage chamber 10 flows sequentially through the outlet pipeline 3, the first inlet 41 of the jet pump, the outlet 43, and the tracer gas inlet into the iodine adsorber.

[0035] The tracer gas generator of this utility model is used as follows: First, the heating element 5 is connected to the power supply to heat the liquid tracer (e.g., liquid cyclohexane); after the liquid tracer is heated to a certain temperature, the power supply to the heating element 5 is disconnected. The first valve 27 and the second valve 33 are opened, and compressed air is introduced into the jet pump. The compressed air flow rate is adjusted by the pressure reducing valve on the jet pump. The tracer gas (e.g., cyclohexane gas) flows sequentially through the outlet pipe 3 and the outlet 43 of the jet pump, and finally enters the iodine adsorber through the tracer gas injection port on the iodine adsorber.

[0036] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A tracer gas generator, characterized in that, It includes a liquid storage container (1), an air inlet pipe (2), an air outlet pipe (3), and a suction unit (4); The liquid storage container (1) is formed with a liquid storage cavity (10) for storing liquid tracers; The air inlet pipe (2) is connected to the liquid storage container (1), connecting the inside and outside of the liquid storage chamber (10); The gas outlet pipe (3) is connected to the liquid storage container (1), and includes a tracer gas input end (31) and a tracer gas output end (32). The tracer gas input end (31) is connected to the liquid storage chamber (10), and the tracer gas output end (32) is used to output tracer gas. The suction unit (4) is connected to the tracer gas output terminal (32) to generate suction force to cause the tracer gas in the liquid storage chamber (10) to escape.

2. The tracer gas generator of claim 1, wherein, The suction unit (4) includes a jet pump, which includes a first air inlet (41), a second air inlet (42), and an air outlet (43). The first air inlet (41) is connected to the tracer gas output terminal (32), the second air inlet (42) is used to connect compressed air, and the air outlet (43) is used to output tracer gas.

3. The tracer gas generator of claim 2, wherein, The first air inlet (41) and the tracer gas output terminal (32) are detachably connected.

4. The tracer gas generator of claim 1, wherein, The tracer gas generator also includes a heating element (5), which is disposed on the outer surface of the liquid storage container (1) and covers the side and / or bottom of the liquid storage container (1).

5. The tracer gas generator according to claim 4, characterized in that, The heating element (5) is detachably disposed on the outer surface of the liquid storage container (1).

6. The tracer gas generator of claim 1, wherein, The tracer gas generator also includes a liquid level tube (6), which is connected to the outer side of the liquid storage container (1) and communicates with the liquid storage cavity (10) to display the liquid level in the liquid storage cavity (10).

7. The tracer gas generator according to claim 1, characterized in that, The air inlet pipe (2) includes an air inlet end (21) and an air outlet end (22). The air inlet end (21) is connected to the external atmosphere of the liquid storage chamber (10). The air outlet end (22) extends into the interior of the liquid storage chamber (10). The air outlet end (22) is provided with a bubble ball (23). And / or, the air intake pipe (2) is provided with a filter element (24) for filtering air; And / or, the air intake pipe (2) and the liquid storage container (1) are detachably connected.

8. The tracer gas generator according to claim 1, characterized in that, The tracer gas generator also includes a pressure measuring unit (7), which is connected to the liquid storage container (1) and is used to display the pressure inside the liquid storage chamber (10).

9. The tracer gas generator according to claim 1, characterized in that, The liquid storage container (1) includes a main body (11) and a cover (12), which together enclose the liquid storage cavity (10); The top of the main body (11) has an opening for injecting liquid tracer into the liquid storage chamber (10), and the cover (12) is rotatably connected to the top of the main body (11).

10. An iodine adsorber performance test system characterized by, Includes an iodine adsorber performance testing device and a tracer gas generator as described in any one of claims 1 to 9; The iodine adsorber performance testing device includes an iodine adsorber and a tracer gas injection port. The tracer gas generator is connected to the tracer gas injection port, and the tracer gas generated by the tracer gas generator enters the iodine adsorber through the tracer gas injection port.

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