A device for testing the solubility of acid gases

Abstract

This invention aims to provide a device for testing the solubility of acidic gases, belonging to the field of acidic gas capture technology. It includes a detection device and an absorption device. The detection device includes an explosion-proof pressure gauge and a computer for recording pressure. The absorption device includes a two-way valve, a solenoid valve, a WIFI smart socket for adjusting the solenoid valve's switch, an acidic gas storage tank, and a reaction tank. After injecting acidic gas into the storage tank, the absorption reaction of the acidic gas is controlled by adjusting the switch of the central solenoid valve, thereby determining the solubility of the acidic gas and evaluating its absorption kinetics. This detection device is characterized by low cost, speed, safety, and simplicity, providing reliable scientific research equipment support for related studies.

Description

Technical Field

[0001] This utility model relates to the field of acid gas capture technology, and in particular to a device for testing the solubility of acid gases. Background Technology

[0002] Acidic gases (such as carbon dioxide, hydrogen sulfide, and sulfur dioxide) have a significant impact on industrial production, environmental monitoring, and energy development. Accurate determination of their solubility is crucial for processes such as gas absorption, separation, storage, and utilization.

[0003] The prior art publication CN117804956A provides a detection device for carbon dioxide capture absorbent. This device tests the absorption capacity of carbon dioxide in the absorbent by the weight difference before and after absorption. It can test three types of absorbents at the same time. It also reduces the regeneration cost of absorbent by using nitrogen purging and raising the temperature of the absorbent liquid, and also reduces the test time for the absorbent to reach the equilibrium concentration.

[0004] Although the existing device scheme described above can achieve the relevant beneficial effects through the existing device structure, it still has the following drawbacks: the existing carbon dioxide capture and absorbent detection device requires re-weighing at certain intervals during detection, which requires manual reading and is prone to human error; at the same time, it cannot remotely control the valve opening and closing to control the reaction.

[0005] To address the shortcomings of existing technologies, the development of a precise, efficient, and easy-to-operate acid gas solubility testing device is of great significance for improving experimental measurement accuracy, optimizing the gas absorption process, and expanding related industrial applications. Utility Model Content

[0006] In order to enable the simple, low-cost, rapid and efficient detection of the solubility of acidic gases, this invention provides a device for testing the solubility of acidic gases.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An apparatus for testing the solubility of acidic gases, comprising:

[0009] Detection device and absorption device,

[0010] The detection device includes an explosion-proof pressure gauge and a computer; the computer is connected to the explosion-proof pressure gauge.

[0011] The absorption unit includes a reactor; a cleaning device; and an acid gas storage tank.

[0012] The absorption device specifically includes an acid gas storage tank, an acid gas storage tank pressure gauge connected to the acid gas storage tank, an acid gas storage tank pressure gauge connected to a two-way valve, and the two-way valve connected to both sides of the central outer pipe connecting the gas storage tank and the reaction tank, which are set in a constant temperature bath. A magnetic stirrer is set under the constant temperature bath, and another two-way valve is set to connect to a vacuum pump. A solenoid valve is set between the two two-way valves. The above components are connected to corresponding compression fittings via 3 mm steel pipes.

[0013] The beneficial effects of this utility model are as follows: (1) The electromagnetic valve of this utility model adopts electronic remote control, which allows timed operation and facilitates simultaneous complex and even high-throughput testing, thus improving experimental efficiency; (2) The pressure of this utility model is measured by a sensor and the data is transmitted to the computer, so that the experimenter does not need to manually record the pressure. At the same time, the sensor has high measurement accuracy, which improves the accuracy of the experiment and reduces the difficulty of operation; (3) This utility model can test the absorption kinetics and solubility of acid gas at the same time in each test, and the overall efficiency is high; (4) The reaction pool and acid gas storage pool of this utility model are both made of pressure-resistant screw-top glass bottles, which are convenient for observing the situation in the reaction process, have high pressure resistance, and can effectively ensure experimental safety. At the same time, since the capacity of the reaction pool is much smaller than that of the acid gas storage pool, it ensures that the device has good versatility under different absorption temperatures and absorption capacities, and sufficient experimental data can be obtained in a wide range of situations. (5) The device of this utility model has a high degree of integration and a small overall footprint of only 0.5m². It can simultaneously test the absorption kinetics and solubility of acidic gases and has high test accuracy, providing scientific and reliable research device support for related research. Attached Figure Description

[0014] Figure 1 This is a diagram of a testing device for measuring the solubility of acidic gases.

[0015] The names of the components are as follows: 1-Acid gas storage tank pressure gauge; 2-Two-way valve; 3-Gas storage tank; 4-Constant temperature bath; 5-Magnetic stirrer; 6-Explosion-proof pressure gauge; 7-Computer; 8-Solenoid valve; 9-Reaction tank; 10-Vacuum pump; 11-WIFI smart socket.

[0016] Figure 2 This is a graph showing the solubility of carbon dioxide at different temperatures, measured using AMP as the absorbent. The horizontal axis represents carbon dioxide pressure, and the vertical axis represents the carbon dioxide loading. Detailed Implementation

[0017] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] This utility model relates to a device for testing the solubility of acidic gases, comprising a detection device and an absorption device. The detection device includes an explosion-proof pressure gauge 6 and a computer 7; the computer 7 is connected to the explosion-proof pressure gauge 6; the absorption device includes a reactor; a cleaning device; and an acidic gas storage tank.

[0019] The absorption device specifically includes an acid gas storage tank, an acid gas storage tank pressure gauge 1 connected to the acid gas storage tank, an acid gas storage tank pressure gauge 1 connected to a two-way valve 2, and two-way valve 2 connected to both sides of the central outer pipe connecting the gas storage tank 3 and the reaction tank 9, which are set in the constant temperature bath 4; a magnetic stirrer 5 is set under the constant temperature bath 4, another two-way valve 2 is set and connected to a vacuum pump 10, and a solenoid valve 8 is set between the two two-way valves 2. The above components are connected to the corresponding compression fittings through 3 mm steel pipes.

[0020] The present invention provides the following specific solution: a computer 7 is connected to an explosion-proof pressure gauge 6 to record the pressure gauge reading every second; a solenoid valve 8 is powered by a commercial WIFI smart socket 11 (such as a Mijia smart socket ZNCZ03CM), and related software is used to adjust the solenoid valve switch.

[0021] The present invention provides a specific solution as follows: The reactor is composed of a reaction tank 9 placed in a constant temperature bath 4 and an electromagnetic valve 8 connected in series. A magnetic stir bar is placed in the constant temperature bath 4, and a magnetic stirrer 5 is installed below the constant temperature bath 4. The constant temperature bath 4 can control the heating temperature. The electromagnetic valve 8 is remotely controlled by a WIFI smart socket 11. The reaction tank 9 is filled with an absorbent. An explosion-proof pressure gauge 6 is installed above the reaction tank 9. The explosion-proof pressure gauge 6 is connected to a computer 7 through a sensor and records the pressure gauge reading every second. The reaction tank 9 can be disassembled. The interface at the central outer tube connected to the explosion-proof pressure gauge (6) is a threaded-gasket sealing port. When the electromagnetic valve 8 is opened, the gas enters the reaction tank (9) from the gas storage tank 3 and reacts.

[0022] The present invention provides a specific solution as follows: the cleaning device includes a vacuum pump 10 and a two-way valve 2. During cleaning, opening the vacuum pump 10 and the two-way valve 2 can achieve vacuuming, which facilitates the cleaning of residual gas in the device.

[0023] This utility model provides a specific solution as follows: The acid gas storage tank includes a two-way valve 2, a storage tank 3 placed in a constant temperature bath 4, and a solenoid valve 8 connected in series. A magnetic stir bar is placed in the constant temperature bath 4, and a magnetic stirrer 5 is installed below the constant temperature bath 4. The constant temperature bath 4 can control the heating temperature. A pressure gauge 6 is installed above the storage tank 3. The explosion-proof pressure gauge 6 is connected to a computer 7 through a sensor and records the reading of the explosion-proof pressure gauge every second. The storage tank 3 is detachable, and its interface with the central outer tube of the constant temperature bath 4 is a threaded-washer sealed port. When filling with gas, the two-way valve 2 is opened, the solenoid valve 8 is closed, and the reading of the explosion-proof pressure gauge 6 is observed. When the gas pressure is close to the required pressure, the two-way valve 2 is immediately closed, and the acid gas filling is completed. During the reaction, the solenoid valve 8 is opened, and the gas enters the reaction zone from the storage tank 3.

[0024] The present invention provides a specific solution as follows: the explosion-proof pressure gauge 6 is a digital pressure gauge or a precision pressure gauge with elastic element.

[0025] This utility model provides a specific solution as follows: The magnetic stirrer 5 has stirring and heating functions. The constant temperature bath 4 is filled with tap water, which is heated and controlled at a set temperature by the magnetic stirrer 5.

[0026] The present invention provides a specific solution as follows: the gas storage tank 3 is a transparent medium pressure-resistant screw bottle, which can withstand pressure of more than 1 MPa.

[0027] The present invention provides a specific solution as follows: the reaction cell is made of a transparent medium pressure-resistant screw-top bottle, which is a constant volume reaction cell and can withstand pressures of more than 1 MPa. Its capacity is much smaller than that of an acid gas storage cell, which ensures that the device has good versatility under different absorption temperatures and absorption capacities, and can obtain sufficient experimental data in a wide range of situations.

[0028] Example

[0029] The test used AMP as the absorbent to measure the solubility of carbon dioxide at different temperatures: 40℃, 50℃, 60℃, 70℃, and 80℃.

[0030] 1. First, install the gas storage tank 3 on the central outer tube of the constant temperature bath 4. Close the solenoid valve 8 through the WIFI smart socket 11 and observe the pressure gauge 1 of the acid gas storage tank (carbon dioxide) to determine whether there is enough carbon dioxide in the gas cylinder. If there is enough carbon dioxide, open the two-way valve 2 connected to the acid gas storage tank 1 and observe the reading of the explosion-proof pressure gauge. When the pressure gauge reading is close to 225 kPa, quickly close the two-way valve 2 connected to the acid gas storage tank. At this time, the pressure gauge reading will drop back to about 220 kPa.

[0031] 2. Turn on vacuum pump 10, place reaction cell 9 containing approximately 9g of 1mol / kg AMP solution onto the central outer tube of thermostatic bath 4, close the two-way valve 2 connected to vacuum pump 10, disconnect the pipeline connected to vacuum pump 2, and turn off vacuum pump 10.

[0032] 3. Immerse the acidic gas storage tank 3 and the reaction tank 9 in a constant temperature bath 4 filled with water, turn on the magnetic stirrer 5, set the speed to 500 r / min, and set the temperature to 40℃.

[0033] 4. Once the magnetic stirrer 5 displays a temperature of approximately 40℃, and the computer 7 with remote control sensor data is observed to have a pressure fluctuation of less than 0.01 kPa within 30 minutes between the acid gas storage tank 3 and the reaction tank 9, the temperature can be considered to have reached the required reaction temperature. At this point, the solenoid valve 8 is opened remotely via the WIFI smart socket 11, and the valve is controlled to open. After waiting for approximately 5 seconds, the solenoid valve 8 is closed, and the absorption reaction begins in the reaction tank 9. At this point, ten data points after the start of the reaction are selected, and the rate constant of the reaction between carbon dioxide and AMP at 40℃ is calculated.

[0034] 5. When the pressure fluctuation in reaction tank 9 is less than 0.01 kPa within 30 minutes, the reaction is considered complete. At this point, if the pressure in reaction tank 9 is not significantly different from the initial pressure (<1 kPa), it is considered that the carbon dioxide has not reached its maximum solubility. The solenoid valve 8 can then be opened remotely via the WIFI smart socket 11. After waiting for about 5 seconds, the solenoid valve 8 is closed. Repeat the above steps until the pressure in reaction tank 9 is significantly different from the initial pressure (>10 kPa). At this point, the carbon dioxide is considered to have reached its maximum solubility. Calculate the difference between the combined carbon dioxide pressure in the acid gas storage tank 3 and the reaction tank 9 before and after the reaction. This will allow you to calculate the maximum solubility of carbon dioxide that 1 mol / kg of AMP can hold at 40°C (expressed as molCO2 / mol).

[0035] 6. After measuring the maximum solubility of carbon dioxide that 1 mol / kg AMP can hold at 40℃, the residual AMP solution and carbon dioxide in the apparatus need to be removed to avoid interference with subsequent measurements. The removal method is as follows:

[0036] 7. First, remove the acid gas storage tank 3 and reaction tank 9 from the constant temperature bath 4, turn off the magnetic stirrer 5, open the two-way valve 2 near the vacuum pump 10, and remotely control the solenoid valve 8 to release the gas via the WIFI smart socket 11, reducing the pressure inside the acid gas storage tank 3 to near atmospheric pressure to avoid danger. Then connect the vacuum pump 10 to the pipeline and turn it on to evacuate the gas. When the pressure inside the acid gas storage tank drops to about 3 kPa, close the solenoid valve 8 and open the two-way valve 2 connected to the acid gas storage tank. When the pressure gauge reading is about 220 kPa, close the two-way valve 2 and open the solenoid valve 8; repeat the above operation three times. Then disconnect the vacuum pump 10 from the pipeline, turn off the vacuum pump 10, remove the reaction tank 9 from the central pipeline, and then reconnect the vacuum pump 10 to the pipeline. Place a beaker containing clean water at the connection port of the central pipeline, turn on the vacuum pump 10, and the clean water in the beaker will be sucked into the vacuum pump pipeline, thereby achieving the effect of cleaning the residual absorbent in the pipeline. Then remove the beaker and wipe the connection port of the central pipeline dry with absorbent paper.

[0037] 8. Repeat steps (2), (3), (4), (5), (6), and (7) to measure the solubility of carbon dioxide at different temperatures: 50℃, 60℃, 70℃, and 80℃. The solubility curves of carbon dioxide at different temperatures are shown below. Figure 2 As shown. By Figure 2 It can be seen that under low carbon dioxide pressure (0-6 kPa, 40°C), the solubility of carbon dioxide increases rapidly with the increase of partial pressure of carbon dioxide, and at this time, the forward absorption reaction of carbon dioxide is dominant. At 40°C, the AMP solution is saturated under a partial pressure of carbon dioxide of about 60 kPa, while with the increase of temperature, the AMP solution is saturated under a lower partial pressure of carbon dioxide. This is because the desorption reaction of carbon dioxide gradually increases with the increase of temperature.

[0038] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. An apparatus for testing the solubility of acidic gases, characterized in that, include Detection device and absorption device, The detection device includes an explosion-proof pressure gauge (6) and a computer (7); the computer (7) is connected to the explosion-proof pressure gauge (6); The absorption device includes a reactor; a cleaning device; and an acidic gas storage tank. The absorption device specifically includes an acid gas storage tank, an acid gas storage tank pressure gauge (1) connected to the acid gas storage tank, an acid gas storage tank pressure gauge (1) connected to a two-way valve (2), a two-way valve (2) connected to the storage tank (3) in the constant temperature bath (4), and the two sides of the central outer tube connected to the reaction tank (9); a magnetic stirrer (5) is set under the constant temperature bath (4), another two-way valve (2) is set to connect to a vacuum pump (10), and a solenoid valve (8) is set between the two two-way valves (2).

2. The apparatus for testing the solubility of acidic gases according to claim 1, characterized in that, The computer (7) is connected to the explosion-proof pressure gauge (6) to record the pressure gauge reading every second; the WIFI smart socket (11) is connected to the solenoid valve (8) to adjust the solenoid valve switch.

3. The apparatus for testing the solubility of acidic gases according to claim 2, characterized in that, The reactor consists of a reaction tank (9) placed in a constant temperature bath (4) and a solenoid valve (8) connected in series. A magnetic stir bar is placed in the constant temperature bath (4), and a magnetic stirrer (5) is installed below the constant temperature bath (4). The constant temperature bath (4) can control the heating temperature. The solenoid valve (8) is remotely controlled by a WIFI smart socket (11). The reaction tank (9) contains an absorbent. An explosion-proof pressure gauge (6) is installed above the reaction tank (9). The explosion-proof pressure gauge (6) is connected to a computer (7) through a sensor and records the pressure gauge reading every second. The reaction tank (9) can be disassembled. The interface at the central outer tube connecting the reaction tank (9) to the explosion-proof pressure gauge (6) is a threaded-gasket sealing port. When the solenoid valve (8) is opened, the gas enters the reaction tank (9) from the gas storage tank (3) and reacts.

4. The apparatus for testing the solubility of acidic gases according to claim 2, characterized in that, The cleaning device includes a vacuum pump (10) and a two-way valve (2). During cleaning, opening the vacuum pump (10) and the two-way valve (2) will achieve vacuuming, which will facilitate the cleaning of residual gas in the device.

5. The apparatus for testing the solubility of acidic gases according to claim 1, characterized in that, The acid gas storage tank consists of a two-way valve (2), a storage tank (3) placed in a constant temperature bath (4), and a solenoid valve (8) connected in series. A magnetic stir bar is placed in the constant temperature bath (4), and a magnetic stirrer (5) is installed below the constant temperature bath (4). The constant temperature bath (4) can control the heating temperature. A pressure gauge (6) is installed above the storage tank (3). The explosion-proof pressure gauge (6) is connected to a computer (7) through a sensor and records the reading of the explosion-proof pressure gauge every second. The storage tank (3) is disassembled. Its interface with the central outer tube of the constant temperature bath (4) is a threaded-wash gasket seal. When filling with gas, open the two-way valve (2), close the solenoid valve (8), and observe the reading of the explosion-proof pressure gauge (6). When the gas pressure is close to the required pressure, close the two-way valve (2) immediately, and the acid gas filling is completed. During the reaction, open the solenoid valve (8), and the gas enters the reaction zone from the storage tank (3).

6. The apparatus for testing the solubility of acidic gases according to claim 1, characterized in that, The explosion-proof pressure gauge (6) is a digital pressure gauge or a precision pressure gauge with elastic elements.

7. The apparatus for testing the solubility of acidic gases according to claim 1, characterized in that, The magnetic stirrer (5) has stirring and heating functions.

8. The apparatus for testing the solubility of acidic gases according to claim 1, characterized in that, The constant temperature bath (4) is filled with tap water, which is heated and controlled at the set temperature by a magnetic stirrer (5).

9. The apparatus for testing the solubility of acidic gases according to claim 1, characterized in that, The gas storage tank (3) is a transparent medium pressure-resistant screw bottle that can withstand pressures of 1 MPa or more.

10. The apparatus for testing the solubility of acidic gases according to claim 1, characterized in that, The reaction tank (9) is made of a transparent medium pressure-resistant screw bottle. It is a constant volume reaction tank and can withstand a pressure of more than 1 MPa. Its capacity is much smaller than that of an acid gas storage tank.

Images