Dynamic adsorption experiment equipment for delayed bed

Abstract

The utility model relates to delay bed dynamic adsorption experiment equipment, and belongs to the technical field of activated carbon adsorption experiments. The gas outlet end of the gas carrier tank is connected with a first output gas pipe; the first gas output pipe is connected to the mixing pipe; the gas outlet end of the inert gas tank is connected with a second output gas pipe, and the second output gas pipe is connected to the first output gas pipe; the delay bed is used for being filled with activated carbon, and the mixing pipe is communicated with the air inlet end of the delay bed. According to the dynamic adsorption experimental equipment for the delayed bed, provided by the utility model, the experimental method is harmless to the environment, the operation is simple, and the experimental result is accurate.

Description

Technical Field

[0001] The utility model relates to delayed bed dynamic adsorption experimental equipment, belonging to the technical field of activated carbon adsorption experiments. Background Art

[0002] During the operation of the reactor, a variety of fission gas products are released from the core, including radioactive inert process gases krypton and xenon. In the early days, the compression tank storage decay method was mostly used to reduce its radioactivity to a dischargeable level. However, this method pressurizes the upstream exhaust gas for storage, and the radioactivity concentration of the concentrated gas is greatly increased. High-pressure storage increases the risk of radioactive leakage and increases the difficulty and cost of personnel radiation protection and shielding. Secondly, due to the high concentration of hydrogen in the exhaust gas to be decayed, long-term high-pressure storage poses safety risks such as hydrogen explosion and leakage, and increases the difficulty and cost of fire prevention, explosion prevention, ventilation, and fire protection. The process requires the corresponding pressurization devices, such as compressors and buffer tanks, which not only increase costs and energy consumption, but also make the operation and control of the system more complicated. In addition, the decay box is large in size and requires more plant space.

[0003] In recent years, this method has been gradually replaced by the safer, more economical and feasible activated carbon delayed bed adsorption decay method. As the filling material of the delayed bed of the radioactive waste gas treatment system, the performance of activated carbon is directly related to the retention performance of the delayed bed.

[0004] In order to complete the localization research and development of activated carbon adsorbents in the activated carbon retention unit of the radioactive waste gas treatment system of a nuclear power plant and the performance evaluation of activated carbon sampling samples used in the activated carbon retention unit of an operating nuclear power plant, and to avoid the introduction of radioactive nuclides during the experimental process, the present invention proposes a delayed bed dynamic adsorption experimental equipment. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a delayed bed dynamic adsorption experimental device, the experimental method is harmless to the environment, the operation is simple, and the experimental results are accurate.

[0006] The technical problem to be solved by the utility model is achieved by adopting the following technical solutions:

[0007] A delayed bed dynamic adsorption experimental equipment, comprising:

[0008] A carrier gas tank, the gas outlet end of which is connected to a first gas output pipe;

[0009] a mixing tube, wherein the first gas output pipe is connected to the mixing tube;

[0010] An inert gas tank, the gas outlet end of which is connected to a second gas output pipe, wherein the second gas output pipe is connected to the first gas output pipe;

[0011] The delayed bed is used to fill activated carbon, and the mixing tube is connected to the air inlet end of the delayed bed.

[0012] The utility model is further configured as follows: a Venturi ejector is disposed on the first output air pipe, and the second output air pipe is connected to the Venturi ejector.

[0013] The utility model is further configured as follows: a first flow controller is provided on the second output air pipe, and a second flow controller is provided on the mixing pipe.

[0014] The utility model is further configured as follows: a first bypass air pipe is connected in parallel to the first output air pipe, one end of the first bypass air pipe is located upstream of the Venturi injector, the other end of the first bypass air pipe is located between the Venturi injector and the mixing pipe, a first control valve is provided on the portion of the first output air pipe located upstream of the Venturi injector, and a second control valve is provided on the first bypass air pipe.

[0015] The utility model is further configured as follows: a first sampling tube is provided between the mixing tube and the delayed bed.

[0016] The utility model is further configured as follows: a second bypass air pipe and a third bypass air pipe connected in parallel are provided between the mixing tube and the first sampling tube, a humidifier is provided on the second bypass air pipe, a third control valve is provided on the portion of the second bypass air pipe located upstream of the humidifier, and a fourth control valve is provided on the third bypass air pipe.

[0017] The utility model is further configured as follows: a thermometer and a dew point meter are arranged on the first sampling tube.

[0018] The utility model is further configured as follows: the first sampling tube is connected to the air inlet end of the delayed bed through an air inlet pipe, the air outlet end of the delayed bed is connected to an exhaust pipe, and a second sampling tube is provided at the tail end of the exhaust pipe.

[0019] The utility model is further configured as follows: a portion of the exhaust pipe located upstream of the second sampling pipe is provided with a back pressure valve.

[0020] The beneficial effects of the utility model are:

[0021] During the experiment, a certain concentration of air, xenon or krypton is injected upstream of the system, and after being fully mixed, it is sent to the delayed bed. The gas concentration and retention time of xenon or krypton in the downstream airflow are measured by gas chromatograph. According to the gas concentration and retention time of xenon or krypton, the dynamic adsorption coefficient of activated carbon is calculated through data processing. This experimental method is harmless to the environment, simple to operate, and the experimental results are accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the overall structure of the utility model.

[0023] Figure 2 It is a partial structural schematic diagram of the utility model.

[0024] In the figure: 1. carrier gas tank; 2. mixing tube; 3. inert gas tank; 4. delayed bed; 5. first output gas pipe; 6. venturi ejector; 7. second output gas pipe; 8. first flow controller; 9. second flow controller; 10. first bypass gas pipe; 11. first control valve; 12. second control valve; 13. first sampling tube; 14. thermometer; 15. dew point meter; 16. second bypass gas pipe; 17. third bypass gas pipe; 18. humidifier; 19. third control valve; 20. fourth control valve; 21. air inlet pipe; 22. exhaust pipe; 23. second sampling tube; 24. back pressure valve. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific illustrations.

[0026] like Figure 1-Figure 2 As shown, a delayed bed dynamic adsorption experimental equipment includes a carrier gas tank 1, a mixing tube 2, an inert gas tank 3 and a delayed bed 4, wherein the gas outlet end of the carrier gas tank 1 is connected to a first output gas pipe 5, the first output gas pipe 5 is provided with a venturi injector 6, the first output gas pipe 5 is connected to the mixing tube 2, the delayed bed 4 is used to fill activated carbon, and the mixing tube 2 is connected to the air inlet end of the delayed bed 4.

[0027] The gas outlet of the inert gas tank 3 is connected to a second gas output pipe 7 , on which a first flow controller 8 is disposed. The second gas output pipe 7 is connected to a venturi ejector 6 on the first gas output pipe 5 , and a second flow controller 9 is disposed on the mixing pipe 2 .

[0028] In order to facilitate the control of the intake amount of inert gas and carrier gas, a first bypass air pipe 10 is connected in parallel to the first output air pipe 5, one end of the first bypass air pipe 10 is located upstream of the venturi injector 6, and the other end of the first bypass air pipe 10 is located between the venturi injector 6 and the mixing tube 2. The part of the first output air pipe 5 located upstream of the venturi injector 6 is provided with a first control valve 11, and the first bypass air pipe 10 is provided with a second control valve 12.

[0029] A first sampling tube 13 is provided between the mixing tube 2 and the delayed bed 4. A thermometer 14 and a dew point meter 15 are provided on the first sampling tube 13. A second bypass air tube 16 and a third bypass air tube 17 connected in parallel are provided between the mixing tube 2 and the first sampling tube 13, a humidifier 18 is provided on the second bypass air tube 16, a third control valve 19 is provided on the portion of the second bypass air tube 16 located upstream of the humidifier 18, and a fourth control valve 20 is provided on the third bypass air tube 17.

[0030] The first sampling tube 13 is connected to the air inlet end of the delayed bed 4 through the air inlet pipe 21. The air outlet end of the delayed bed 4 is connected to the exhaust pipe 22. The tail end of the exhaust pipe 22 is provided with a second sampling tube 23. The part of the exhaust pipe 22 located upstream of the second sampling tube 23 is provided with a back pressure valve 24.

[0031] The implementation principle of the utility model is:

[0032] During the experiment, open the carrier gas tank 1, adjust the back pressure valve 24, and maintain the system air volume at 1.2Nm3 / h, 0.135MPa; measure the temperature and dew point of the gas in the pipeline; open the inert gas tank 3, inject xenon or krypton, the injection time is 1-5 minutes, the injection pressure is 0.3MPa, and the injection end time is T1; sample the downstream gas of the delayed bed 4, and measure the xenon or krypton concentration with a gas chromatograph. After the xenon or krypton is detected, record the start time T2; sample the downstream once every 3-12 minutes, record the sampling time T3...Tn, and record the xenon or krypton concentration at each time until the xenon or krypton is no longer detected; draw a time-concentration curve through the measurement data; calculate the dynamic adsorption coefficient of activated carbon according to the formula Kd=T·F / M; where: T is the delay time, Kd is the dynamic adsorption coefficient, M is the mass of activated carbon, and F is the carrier gas flow rate.

[0033] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A delayed bed dynamic adsorption experimental equipment, characterized in that: include: A carrier gas tank (1), the gas outlet end of which is connected to a first gas output pipe (5); A mixing tube (2), wherein the first gas output pipe (5) is connected to the mixing tube (2); An inert gas tank (3), the gas outlet end of which is connected to a second gas output pipe (7), and the second gas output pipe (7) is connected to the first gas output pipe (5); The delayed bed (4) is used to fill activated carbon, and the mixing tube (2) is connected to the air inlet end of the delayed bed (4).

2. A delayed bed dynamic adsorption experimental equipment according to claim 1, characterized in that: The first air output pipe (5) is provided with a Venturi ejector (6), and the second air output pipe (7) is connected to the Venturi ejector (6).

3. A delayed bed dynamic adsorption experimental equipment according to claim 2, characterized in that: The second gas output pipe (7) is provided with a first flow controller (8), and the mixing pipe (2) is provided with a second flow controller (9).

4. A delayed bed dynamic adsorption experimental equipment according to claim 2, characterized in that: A first bypass air pipe (10) is connected in parallel to the first output air pipe (5); one end of the first bypass air pipe (10) is located upstream of the Venturi ejector (6); the other end of the first bypass air pipe (10) is located between the Venturi ejector (6) and the mixing pipe (2); a first control valve (11) is provided at a portion of the first output air pipe (5) located upstream of the Venturi ejector (6); and a second control valve (12) is provided on the first bypass air pipe (10).

5. A delayed bed dynamic adsorption experimental equipment according to claim 4, characterized in that: A first sampling tube (13) is provided between the mixing tube (2) and the delayed bed (4).

6. A delayed bed dynamic adsorption experimental equipment according to claim 5, characterized in that: A second bypass air pipe (16) and a third bypass air pipe (17) connected in parallel are provided between the mixing pipe (2) and the first sampling pipe (13); a humidifier (18) is provided on the second bypass air pipe (16); a third control valve (19) is provided on a portion of the second bypass air pipe (16) located upstream of the humidifier (18); and a fourth control valve (20) is provided on the third bypass air pipe (17).

7. The delayed bed dynamic adsorption experimental equipment according to claim 5, characterized in that: The first sampling tube (13) is provided with a thermometer (14) and a dew point meter (15).

8. The delayed bed dynamic adsorption experimental equipment according to claim 6, characterized in that: The first sampling tube (13) is connected to the air inlet end of the delayed bed (4) via an air inlet pipe (21); the air outlet end of the delayed bed (4) is connected to an exhaust pipe (22); and a second sampling tube (23) is provided at the tail end of the exhaust pipe (22).

9. The delayed bed dynamic adsorption experimental equipment according to claim 8, characterized in that: A back pressure valve (24) is provided at a portion of the exhaust pipe (22) located upstream of the second sampling pipe (23).

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