Dynamic water adsorption capacity testing device for drying agent

Abstract

The utility model discloses a dynamic water adsorption capacity testing device for a drying agent. The dynamic water adsorption capacity testing device comprises a moisture generating device, a condenser and a drying column which are connected in sequence, the top of the moisture generating device is connected with a first connecting pipeline which is connected with the lower end of the condenser, a containing cavity is formed in the moisture generating device, pure water is contained in the containing cavity, the upper side of the containing cavity is connected with an air inlet pipeline, the condenser is connected with a refrigerating device, and the condenser is connected with the drying column through a second connecting pipeline. A drying agent to be detected is placed in the drying column. The technical scheme has the beneficial effects that the water absorption capacity of the drying agent is tested, and the dynamic drying detection of different drying agents under different water-containing states and pressures is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas drying technical field, specifically relates to a drying agent dynamic water adsorption capacity testing device. BACKGROUND

[0002] Molecular sieve, alumina, silica gel, calcium chloride and other drying agents are widely used in the field of gas drying. When purchasing drying agents, manufacturers usually only provide the static water adsorption capacity of the drying agents, but not the dynamic water adsorption capacity, i.e. the dynamic adsorption capacity and the dynamic drying effect. The national standard GB / T 8770-2014 specifies a method for determining the adsorption of nitrogen gas stream by molecular sieve formed products, but it can only test the adsorption capacity of nitrogen gas stream saturated with water vapor at normal pressure and 25±2℃, and cannot test the adsorption capacity of gas with higher pressure and lower water content. In actual applications, especially in the field of gas purification, the water content in the raw material is usually lower than that in the nitrogen gas stream saturated with water vapor at 25±2℃, but it may affect the subsequent purification process (e.g. ice blocking may occur in low-temperature rectification), so it is necessary to dry the raw material before entering the next purification process. Therefore, it is necessary to test the adsorption capacity of the drying agent under the condition of gas with corresponding water content, i.e. the drying effect and the adsorption capacity, to determine the regeneration period of the drying agent and avoid affecting the subsequent purification process. SUMMARY

[0003] To solve the above technical problems, the utility model provides a drying agent dynamic water adsorption capacity testing device, which realizes dynamic water adsorption capacity testing of various drying agents.

[0004] Specifically, the utility model discloses a drying agent dynamic water adsorption capacity testing device, which comprises a moisture generating device, a condenser and a drying column connected in sequence; the top of the moisture generating device is connected with a first connecting pipeline connected with the lower end of the condenser; the moisture generating device is internally provided with a containing cavity; the containing cavity contains pure water; the upper side is connected with an air inlet pipeline; the condenser is connected with a refrigeration device; the condenser is connected with the drying column through a second connecting pipeline; and the drying agent to be detected is placed in the drying column.

[0005] The above technical solution has the advantages of realizing drying agent water absorption capacity testing and realizing dynamic drying detection of different drying agents and different water content states.

[0006] Further, the end of the air inlet pipeline extends into the lower side of the liquid surface of the containing cavity, and a gas flow controller is arranged on the air inlet pipeline.

[0007] The above technical solution has the advantages of introducing gas into the lower side of the liquid surface, so that the outgoing gas contains water, which facilitates subsequent detection; the gas flow controller can detect the gas flow, and changing the gas flow can realize water absorption capacity detection under different conditions.

[0008] Further, the air inlet pipe end is sealed, and the side wall is provided with a plurality of air outlet holes.

[0009] The beneficial effects of the above technical solution are that the plurality of air outlet holes enable the gas to fully contact with the water.

[0010] Further, the condenser is provided with a thermometer, the condenser is provided with a condensing coil, and the condensing coil is connected with the refrigeration device.

[0011] The beneficial effects of the above technical solution are that the thermometer is used to display the temperature in the condenser, so that the temperature reaches a set value, and the temperature is detected in real time to ensure that the temperature meets the use requirement, and the condensing coil is used to cool, so that part of the water in the gas is condensed, and the water content in the gas reaches a set value, and different use scenarios are simulated.

[0012] Further, the upper side of the drying column is provided with an air outlet pipe, and the air outlet pipe is provided with a moisture meter, a back pressure valve and a pressure gauge.

[0013] The beneficial effects of the above technical solution are that the moisture meter is used to detect the water content, and when the set value is reached, it is considered to be penetrated, and the adsorption process is completed, and then the weighing is performed.

[0014] Further, the first connecting pipe is provided with a front condenser pressure gauge, and the second connecting pipe is provided with a rear condenser pressure gauge.

[0015] The beneficial effects of the above technical solution are that the front and rear condenser pressure gauges are used to display the pressure before and after the condensation, so that the water absorption under different pressures is monitored, and whether ice blockage occurs in the condenser can be judged through the change of the pressure difference before and after the condenser.

[0016] Further, the holding cavity is provided with a mesh demister, and the mesh demister is arranged at a position 10-20 cm above the liquid surface.

[0017] The beneficial effects of the above technical solution are that the fine liquid droplets are prevented from entering the condenser along with the gas flow, and the water content in the gas reaches a required value. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or prior art description will be briefly introduced.

[0019] Figure 1 is a connection schematic diagram of the drying agent dynamic water adsorption capacity test device of the present application

[0020] In the drawings, the reference signs are as follows:

[0021] moisture generating device 1; gas flow controller 11; condenser front pressure gauge 12; first connecting pipe 13; air inlet pipe 14; condenser 2; thermometer 21; condenser rear pressure gauge 22; second connecting pipe 23; condensing coil 24; drying column 3; pressure gauge 31; back pressure valve 32; air outlet pipe 33; moisture meter 4; mesh demister 15. DETAILED DESCRIPTION

[0022] The utility model will be further explained in detail in connection with the drawings.

[0023] As Figure 1 shown, the utility model discloses a kind of desiccant dynamic water adsorption capacity testing device, including moisture generating device 1, condenser 2 and drying column 3 connected in sequence;The moisture generating device 1 top is connected with the lower end of first connecting pipe 13 and condenser 2 connection, the moisture generating device 1 inside is provided with holding cavity, pure water is contained in the holding cavity, upper side is connected air inlet pipe 14, the condenser 2 is connected with refrigeration device, the condenser 2 with the drying column 3 is connected by second connecting pipe 23, and the desiccant to be detected is placed in the drying column 3.

[0024] The beneficial effects of the above technical solution are that the desiccant water absorption capacity test is realized, and dynamic drying detection under different desiccants, different water content and pressure is realized.

[0025] In some embodiments, air inlet pipe 14 end extends into holding cavity liquid level downside, air inlet pipe 14 end is sealed, and a plurality of air outlets are provided on the side wall, nitrogen is introduced into air inlet pipe 14, nitrogen enters below pure water liquid level, so that it has a certain water content, for testing desiccant, convenient for subsequent detection. Multiple air outlets make nitrogen and pure water fully contact.

[0026] Further, the condenser 2 is provided with a thermometer 21, and the thermometer 21 is arranged on the upper side of the condenser 2 to detect the temperature inside the condenser 2.

[0027] The beneficial effects of the above technical solution are that the thermometer is used to display the temperature in the condenser 2, so that the temperature reaches the set value, and the temperature is monitored in real time to ensure that the temperature meets the use requirements.

[0028] In some embodiments, the condenser 2 is provided with a condensing coil 24, the condensing coil 24 is connected with the refrigeration device, the refrigeration device is a refrigeration machine, and the temperature inside the condenser 2 is controlled. The condensing coil 24 is arranged to play a cooling role, condenses a part of water carried by gas, reduces the water content of the whole gas, and simulates different use scenarios.

[0029] Further, the drying column 3 is provided with an air outlet pipeline 33 on the upper side, the air outlet pipeline 33 is provided with a water content meter 4, a back pressure valve 32 and a pressure gauge 31, and a plurality of stop valves are further arranged on the air outlet pipeline. The water content meter 4 is arranged for detecting the water content, and when the set value is reached, it is considered to be penetrated, the adsorption process is completed, and then the weighing is carried out.

[0030] Further, the first connecting pipeline 13 is provided with a condenser front pressure gauge 12, and the second connecting pipeline 23 is provided with a condenser rear pressure gauge 22, and the condenser front pressure gauge 12 is provided with a stop valve on the rear side, and the condenser rear pressure gauge 22 is provided with a stop valve on the front side, so as to control the opening and closing of the first connecting pipeline and the second connecting pipeline, and the condenser front pressure gauge 12 and the condenser rear pressure gauge 22 detect the gas pressure before and after condensation.

[0031] The beneficial effects of the above technical scheme are that the condenser front and rear pressure gauges are arranged to display the pressure before and after condensation, to realize the water absorption detection under different pressures, and to judge whether ice blocking occurs in the condenser through the change of the pressure difference before and after the condenser.

[0032] In some embodiments, the gas flow controller 11 is arranged on the gas inlet pipeline 14, and stop valves are arranged on both sides of the gas flow controller 11.

[0033] Further, the mesh demister 15 is arranged in the containing cavity, and the mesh demister 15 is arranged at a position 10-20 cm above the liquid surface.

[0034] The beneficial effects of the above technical scheme are that the fine liquid droplets are prevented from entering the condenser 2 with the gas flow, so as to ensure that the water content of the gas reaches the required value.

[0035] Further, the application further discloses a method for dynamically detecting the water absorption capacity of a drying agent:

[0036] 1. referring to the dew point temperature-water content table, the dew point temperature corresponding to the water content of the raw material is determined;

[0037] 2. according to the dew point temperature found in the above step, the temperature of the refrigeration device (i.e. the ice machine) is set, and the ice machine is started, and the condenser 2 is cooled, so that the temperature of the condenser 2 reaches the corresponding dew point temperature;

[0038] 3. according to the working pressure of the working condition, the back pressure value of the back pressure valve 32 is set;

[0039] 4. the drying agent to be tested is filled into the drying column 3, and the drying column 3 is weighed before and after filling, and the filling amount (m0) of the drying agent is calculated, and the drying column 3 is placed in the regenerator and heated by high-purity nitrogen gas, and after regeneration is completed, the drying column 3 is weighed after it is cooled to room temperature, and the weight (m1) is recorded;

[0040] 5. Purge the pipeline after the drying column 3 with nitrogen until the water content does not change;

[0041] 6. Install the regenerated drying column 3 on the test device and check the air tightness;

[0042] 7. Calculate the gas flow according to the working conditions and set the set value of the gas flow controller;

[0043] 8. After the temperature of the condenser 2 reaches the set temperature, open the valves except the nitrogen source, then open the nitrogen source valve, start the drying agent drying performance test, record the temperature of the condenser 2, the pressure before and after the condenser 2, the pressure of the drying column 3, and the water content after drying;

[0044] 9. When the water content of the dried gas is higher than the target value, it is considered to be penetrated, the test is ended, the nitrogen source valve is closed first, then the other valves are closed in sequence according to the gas flow direction, the ice machine is closed, and the pipeline after the drying column 3 is purged with nitrogen;

[0045] 10. Disassemble the drying column 3, weigh it, and record (m2);

[0046] 11. The dynamic adsorption capacity of the adsorbent under the current conditions can be calculated by the formula (m2-m1) / m0*100%;

[0047] The moisture test result during the test is the drying effect of the adsorbent under the current conditions.

[0048] The device provided in the application can test the water adsorption capacity of the drying agent for different water content gases; and can also test the dynamic water adsorption capacity of the drying agent under different operating pressures.

[0049] The following takes testing 13X molecular sieve as an example, and the specific process is as follows: testing the dynamic adsorption capacity of 13X molecular sieve for water content corresponding to a dew point temperature of 0℃, a drying pressure of 1barG, a flow rate of 1L / min, and a water content of the dried gas not higher than 5ppm.

[0050] The measuring device used includes a gas flow controller 11, a wet gas generating device 1, a condenser 2, a drying column 3, a back pressure valve 32, and a moisture meter 4.

[0051] Among them, the gas flow controller 11, the wet gas generating device 1, the condenser 2, the drying column 3, the back pressure valve 32, and the moisture meter are connected in sequence.

[0052] The wet gas generating device 1 is filled with pure water, the end of the inserted pipeline is welded and sealed, small round holes are uniformly opened in the inner wall of the pipeline 10cm below the liquid level, and a mesh demister 15 is arranged 10cm above the liquid level.

[0053] A stop valve is arranged on the pipeline before the moisture generating device.

[0054] The condenser 2 is provided with a coil pipe, and the coil pipe is provided with a refrigerant supplied by an ice machine. The condenser 2 is provided with a temperature measuring point at the top.

[0055] Pressure gauges are arranged between the moisture generating device 1 and the condenser 2, between the condenser 2 and the adsorption column, and between the adsorption column and the back pressure valve 32.

[0056] The test process is as follows:

[0057] 1. The temperature of the ice machine is set to 0℃;

[0058] 2. The back pressure value of the back pressure valve 32 is set to 1 bar;

[0059] 3. The activated 13X molecular sieve is filled into the drying column 3 (with a volume of 120 mL). A total of 80 g of 13X molecular sieve is filled into the drying column 3, and the drying column 3 is placed in a regenerator and heated and regenerated by high-purity nitrogen. After the regeneration is completed, the drying column 3 is weighed after it is cooled to room temperature, and the weight is recorded (m1=783.6 g);

[0060] 4. The pipeline after the drying column 3 is purged by nitrogen until the water content is stable at 0.2 ppm;

[0061] 5. The regenerated drying column 3 is installed on the above test device and subjected to airtightness inspection;

[0062] 6. The set value of the gas flow controller is set to 1 L / min;

[0063] 7. After the temperature of the condenser 2 is stable at 0℃, the valves other than the nitrogen source valve are opened, and then the nitrogen source valve is opened, and the dynamic adsorption water capacity test of the 13X molecular sieve is started. The temperature of the condenser 2, the pressure before and after the condenser, the pressure of the drying column 3, and the water content after drying are recorded, as shown in Table 1 of the test record;

[0064] 8. When the water content of the dried gas is higher than 5 ppm, it is regarded as breakthrough, and the test is ended. The nitrogen source valve is closed first, and then the other valves are closed in sequence according to the gas flow direction. The ice machine is closed, and the pipeline after the drying column 3 is purged by nitrogen;

[0065] 9. The drying column 3 is disassembled and weighed, and the weight is recorded (m2=801.44 g);

[0066] 10. The dynamic adsorption amount of the adsorbent under the current condition can be calculated by the formula (m2-m1) / m0*100% as 22.3%;

[0067] 11. The moisture test result in the test process is the drying effect of the adsorbent under the current condition

[0068] Desiccant dynamic water sorption capacity test Table 1

[0069]

[0070]

[0071] For those skilled in the art, without departing from the inventive concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A desiccant dynamic water adsorption capacity testing device, characterized in that, The utility model provides a kind of dry-bulb psychrometer, including the wet gas generating device (1) connected in turn, condenser (2) and drying column (3);The first connecting pipeline (13) is connected to the top of the wet gas generating device (1) and the lower end of condenser (2), the wet gas generating device (1) is internally provided with a holding cavity, pure water is contained in the holding cavity, and the upper side is connected with air inlet pipeline (14), the condenser (2) is connected with refrigeration device, the condenser (2) is connected with the drying column (3) by second connecting pipeline (23), and the drying agent to be detected is placed in the drying column (3).

2. The desiccant dynamic water sorption capacity test apparatus of claim 1, wherein, The end of the air inlet pipeline (14) extends into the lower side of the liquid level of the holding cavity, and a gas flow controller (11) is arranged on the air inlet pipeline (14).

3. The desiccant dynamic water sorption capacity test apparatus of claim 2, wherein, The end of the air inlet pipeline (14) is sealed, and a plurality of air outlet holes are arranged on the side wall.

4. The desiccant dynamic water sorption capacity test apparatus of claim 1, wherein, The condenser (2) is provided with a thermometer (21), and the condenser (2) is provided with a condensing coil (24), which is connected with the refrigeration device.

5. The desiccant dynamic water sorption capacity test apparatus of claim 1, wherein, The upper side of the drying column (3) is provided with an air outlet pipeline (33), and the air outlet pipeline (33) is provided with a moisture meter (4), a back pressure valve (32) and a pressure gauge (31).

6. The desiccant dynamic water sorption capacity test apparatus of claim 1, wherein, The first connecting pipeline (13) is provided with a condenser front pressure gauge (12), and the second connecting pipeline (23) is provided with a condenser rear pressure gauge (22).

7. The desiccant dynamic water sorption capacity test apparatus of claim 1, wherein, A mesh demister (15) is arranged in the holding cavity, and the mesh demister (15) is arranged at a height of 10-20 cm above the liquid level.

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