CN222393942U

CN222393942U - A delayed bed dynamic adsorption experimental equipment

Info

Publication number: CN222393942U
Application number: CN202420849678.6U
Authority: CN
Inventors: 彭蕾; 杨凯; 苏军杰; 刘永; 王建峰; 程亚飞; 郑杰锋
Original assignee: Henan Hejing Cleaning Technology Co ltd
Current assignee: Henan Hejing Cleaning Technology Co ltd
Priority date: 2024-04-23
Filing date: 2024-04-23
Publication date: 2025-01-24
Anticipated expiration: 2034-04-23

Abstract

The utility model relates to a delay bed dynamic adsorption experimental device, and belongs to the technical field of activated carbon adsorption experiments. The gas-carrying tank comprises a gas-carrying tank, a mixing pipe, an inert gas tank and a delay bed, wherein the gas-carrying end of the gas-carrying tank is connected with a first gas outlet pipe, the first gas outlet pipe is connected with the mixing pipe, the gas-carrying tank is connected with a second gas outlet pipe, the second gas outlet pipe is connected with the first gas outlet pipe, the delay bed is used for filling activated carbon, and the mixing pipe is communicated with the gas inlet end of the delay bed. The utility model provides the delay bed dynamic adsorption experimental equipment, and the experimental method is harmless to the environment, simple to operate and accurate in experimental result.

Description

Delay bed dynamic adsorption experimental equipment

Technical Field

The utility model relates to a delay bed dynamic adsorption experimental device, and belongs to the technical field of activated carbon adsorption experiments.

Background

Various fission gas products, including the radioactive inert process gases krypton and xenon, are released from the core during operation of the reactor. In the early stage, the radioactivity of the waste gas is reduced to an emission level by adopting a compression tank storage decay method, but the method carries out pressurized storage on the upstream waste gas, the radioactivity concentration of the concentrated gas is greatly increased, the risk of radioactive leakage is increased by high-pressure storage, the radiation protection and shielding difficulty and cost of personnel are increased, and secondly, the safety risks such as hydrogen explosion, leakage and the like are increased by long-time high-pressure storage due to the higher hydrogen concentration in the waste gas to be decayed, and the design difficulties and cost such as fire prevention, explosion prevention, ventilation, fire fighting and the like are increased.

In recent years, the method is gradually replaced by a safer, economical and feasible activated carbon delay bed adsorption decay method. The performance of the activated carbon as a loading material of a delay bed of a radioactive waste gas treatment system is directly related to the delay bed retention performance.

In order to complete domestic research and development of activated carbon adsorbent of activated carbon retention unit of radioactive waste gas treatment system of nuclear power station, evaluate performance of activated carbon sampling sample used in operation of activated carbon retention unit of nuclear power station, and avoid introduction of radionuclide in experimental process, the invention provides a delay bed dynamic adsorption experimental device.

Disclosure of utility model

The utility model aims to solve the technical problems of providing the delay bed dynamic adsorption experimental equipment, which has the advantages of no harm to the environment, simple operation and accurate experimental result.

The technical problems to be solved by the utility model are realized by adopting the following technical scheme:

A lag bed dynamic adsorption experimental apparatus, comprising:

the air outlet end of the air carrier is connected with a first air outlet pipe;

The first output air pipe is connected with the mixing pipe;

the air outlet end of the inert gas tank is connected with a second air output pipe, and the second air output pipe is connected with the first air output pipe;

And the delay bed is used for filling activated carbon, and the mixing pipe is communicated with the air inlet end of the delay bed.

The utility model is further arranged that the first output air pipe is provided with a Venturi ejector, and the second output air pipe is connected with the Venturi ejector.

The utility model is further arranged that the second output air pipe is provided with a first flow controller, and the mixing pipe is provided with a second flow controller.

The utility model is further characterized in that a first bypass pipe is connected in parallel to the first output pipe, one end of the first bypass pipe is positioned at the upstream of the venturi ejector, the other end of the first bypass pipe is positioned between the venturi ejector and the mixing pipe, a first control valve is arranged at the part of the first output pipe positioned at the upstream of the venturi ejector, and a second control valve is arranged on the first bypass pipe.

The utility model is further arranged that a first sampling tube is arranged between the mixing tube and the delay bed.

The utility model is further characterized in that a second bypass air pipe and a third bypass air pipe which are connected in parallel are arranged between the mixing pipe and the first sampling pipe, a humidifier is arranged on the second bypass air pipe, a third control valve is arranged on the part, located at the upstream of the humidifier, of the second bypass air pipe, and a fourth control valve is arranged on the third bypass air pipe.

The utility model is further arranged that the first sampling tube is provided with a thermometer and a dew point meter.

The utility model is further arranged that the first sampling tube is connected with the air inlet end of the delay bed through an air inlet tube, the air outlet end of the delay bed is connected with an exhaust tube, and the tail end of the exhaust tube is provided with a second sampling tube.

The utility model is further arranged that the part of the exhaust pipe positioned at the upstream of the second sampling pipe is provided with a back pressure valve.

The beneficial effects of the utility model are as follows:

In the experiment, a certain concentration of air, xenon or krypton was injected upstream of the system, and after thorough mixing, fed into the lag bed. The gas concentration and residence time of the downstream gas stream of xenon or krypton were measured by gas chromatography. According to the gas concentration and the residence time of the xenon or krypton, the dynamic adsorption coefficient of the activated carbon is calculated through data processing. The experimental method has no harm to the environment, is simple to operate, and has accurate experimental results.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

Fig. 2 is a partial structural schematic of the present utility model.

In the figure, 1, a carrier gas tank; 2, mixing pipe, 3, inert gas tank, 4, delay bed, 5, first output gas pipe, 6, venturi injector, 7, second output gas pipe, 8, first flow controller, 9, second flow controller, 10, first bypass pipe, 11, first control valve, 12, second control valve, 13, first sampling pipe, 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, intake pipe, 22, exhaust pipe, 23, second sampling pipe, 24, back pressure valve.

Detailed Description

The utility model will be further described with reference to the following detailed drawings, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

As shown in fig. 1-2, the dynamic adsorption experimental equipment for the delay bed comprises a carrier gas tank 1, a mixing pipe 2, an inert gas tank 3 and the delay bed 4, wherein the gas outlet end of the carrier gas tank 1 is connected with a first gas outlet pipe 5, a venturi injector 6 is arranged on the first gas outlet pipe 5, the first gas outlet pipe 5 is connected with the mixing pipe 2, the delay bed 4 is used for filling activated carbon, and the mixing pipe 2 is communicated with the gas inlet end of the delay bed 4.

The air outlet end of the inert gas tank 3 is connected with a second output gas pipe 7, a first flow controller 8 is arranged on the second output gas pipe 7, the second output gas pipe 7 is connected with a Venturi ejector 6 on the first output gas pipe 5, and a second flow controller 9 is arranged on the mixing pipe 2.

In order to control the air inflow of inert gas and carrier gas conveniently, a first bypass pipe 10 is connected in parallel to the first output air pipe 5, one end of the first bypass pipe 10 is located at the upstream of the venturi injector 6, the other end of the first bypass pipe 10 is located between the venturi injector 6 and the mixing pipe 2, a first control valve 11 is arranged at the part of the first output air pipe 5 located at the upstream of the venturi injector 6, and a second control valve 12 is arranged on the first bypass pipe 10.

A first sampling tube 13 is arranged between the mixing tube 2 and the delay bed 4. The first sampling tube 13 is provided with a thermometer 14 and a dew point meter 15. A second bypass air pipe 16 and a third bypass air pipe 17 which are connected in parallel are arranged between the mixing pipe 2 and the first sampling pipe 13, a humidifier 18 is arranged on the second bypass air pipe 16, a third control valve 19 is arranged at the part, located at the upstream of the humidifier 18, of the second bypass air pipe 16, and a fourth control valve 20 is arranged on the third bypass air pipe 17.

The first sampling tube 13 is connected to the air inlet end of the delay bed 4 through an air inlet tube 21, the air outlet end of the delay bed 4 is connected with an air outlet tube 22, and the tail end of the air outlet tube 22 is provided with a second sampling tube 23. The portion of the exhaust pipe 22 upstream of the second sampling pipe 23 is provided with a back pressure valve 24.

The implementation principle of the utility model is as follows:

During experiments, the gas carrying tank 1 is opened, the back pressure valve 24 is regulated to maintain the system air volume at 1.2Nm3/h and 0.135MPa, the temperature and the dew point of the gas in a pipeline are measured, the inert gas tank 3 is opened, xenon or krypton is injected for 1-5 minutes, the injection pressure is 0.3MPa, the injection time is finished to be T1, the gas at the downstream of the delay bed 4 is sampled, and the concentration of the xenon or krypton is measured by a gas chromatograph. After xenon or krypton is detected, the starting time T2 is recorded, the downstream is sampled every 3-12 minutes, the sampling time T3..Tn is recorded, the concentration of the xenon or krypton at each time is recorded until no xenon or krypton is detected, a time-concentration curve is drawn through measurement data, the dynamic adsorption coefficient of the activated carbon is calculated according to the formula Kd=T.F/M, wherein T is delay time, kd is the dynamic adsorption coefficient, M is the mass of the activated carbon, and F is the carrier gas flow.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, but is capable of various changes and modifications without departing from the spirit and scope of the utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A delayed bed dynamic adsorption experimental equipment, characterized in that it comprises:

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: a Venturi ejector (6) is provided on the first output air pipe (5), and the second output air pipe (7) is connected to the Venturi ejector (6).

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

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), and the other end of the first bypass air pipe (10) is located between the Venturi ejector (6) and the mixing tube (2), a first control valve (11) is provided on the part 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 tube (2) and the first sampling tube (13), a humidifier (18) is provided on the second bypass air pipe (16), a third control valve (19) is provided on the part 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. A delayed bed dynamic adsorption experimental equipment according to claim 5, characterized in that a thermometer (14) and a dew point meter (15) are provided on the first sampling tube (13).

8. A 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) through 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. A 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).