Gas-liquid equilibrium reaction parameter measuring device

Abstract

The invention relates to the technical field of carbon dioxide absorbents, in particular to a gas-liquid equilibrium reaction parameter measuring device. According to the gas-liquid equilibrium reaction parameter measuring device, the output end of a CO2 gas cylinder is connected with a water bath device, a gas preparation chamber communicated with the CO2 gas cylinder is arranged in the water bath device, and the output end of the gas preparation chamber is sequentially connected with a gas tank, a gas passing chamber and a liquid tank; the liquid tank is connected with a flushing water tank which is arranged outside the water bath device and is used for flushing the liquid tank, and an absorbent storage tank which is used for providing an absorbent, so that the measurement precision of the gas-liquid equilibrium reaction parameter measurement device for the carbon dioxide capture absorbent can be improved, and the automatic cleaning of the device is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide absorbents, and particularly to a device for measuring gas-liquid equilibrium reaction parameters. Background Art

[0002] In the current field of carbon dioxide absorbent development, measuring the physicochemical property parameters of absorbents is a key task. By detecting the physicochemical properties of absorbents to obtain corresponding parameters, the corresponding physicochemical models can be improved, which helps to build a carbon capture system model and predict the system operation parameters.

[0003] In existing carbon dioxide absorbent gas-liquid equilibrium reaction measurement devices, since the movement speed of the actuator during the opening and closing of the valve by the automation system far exceeds the pressure difference balance speed between the high-pressure area and the low-pressure area, a large amount of gas enters the liquid area to react before the system executes the action, resulting in low accuracy during the automatic operation of the system; at the same time, existing systems often lack an automated cleaning device for the system, which seriously affects the results of the next experiment. Since absorbents are generally fluids with high viscosity, the system must be rinsed with pure water after the experiment.

[0004] In view of this, the present application proposes a high-precision and automated device for measuring gas-liquid equilibrium reaction parameters to solve the problems of insufficient measurement accuracy of the carbon dioxide capture absorbent gas-liquid equilibrium reaction parameter measurement device and insufficient automation degree of system cleaning. Summary of the Invention

[0005] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and provide a device for measuring gas-liquid equilibrium reaction parameters.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A device for measuring gas-liquid equilibrium reaction parameters includes a high-purity CO2 gas cylinder. The output end of the CO2 gas cylinder is connected to a water bath device. A gas preparation chamber communicated with the CO2 gas cylinder is arranged in the water bath device. The output end of the gas preparation chamber is sequentially connected to a gas tank, a gas passage chamber, and a liquid tank. A flushing water tank for flushing the liquid tank and an absorbent storage tank for providing absorbents are connected to the liquid tank and are arranged outside the water bath device.

[0007] Further, a gas pressure reducing valve is installed on the pipeline between the CO2 gas cylinder and the gas preparation chamber.

[0008] Further, a three-way valve is arranged at the output end of the gas preparation chamber and is respectively connected to a first evacuation pipeline and the gas tank through the three-way valve. A vacuum pump is installed on the first evacuation pipeline.

[0009] Furthermore, a first temperature sensor and a first pressure sensor are provided on the gas cylinder.

[0010] Furthermore, a steel plate is provided inside the gas passage chamber, and tiny conical holes are formed in the steel plate. The conical holes are located at the bottom left and the top right of the steel plate.

[0011] Furthermore, a CO2 input valve is installed on the pipeline between the gas cylinder and the gas passage chamber, and a CO2 output valve is installed on the pipeline between the gas passage chamber and the liquid tank.

[0012] Furthermore, a CO2 bypass valve is installed on the pipeline between the gas cylinder and the liquid tank. The CO2 bypass valve is arranged in parallel with the CO2 input valve and the CO2 output valve.

[0013] Furthermore, an absorbent buffer chamber is connected between the liquid tank and the absorbent storage tank. An absorbent input valve and an absorbent output valve are respectively installed on the input pipeline and the output pipeline of the absorbent buffer chamber.

[0014] Furthermore, a second pressure sensor, a second temperature sensor, a pressure relief valve, and a magnetic stirrer are provided on the liquid tank; a second drain pipeline is provided at the bottom of the liquid tank, and a drain valve is installed on the second drain pipeline.

[0015] Furthermore, a flushing water pump is provided at the output end of the flushing water tank. The output end of the flushing water pump is provided with two flushing pipes. The tops of the two flushing pipes are inserted from both sides above the liquid tank and are arranged in a staggered manner.

[0016] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0017] 1. The present application can heat up the pure CO2 just released from the CO2 steel cylinder through the gas preparation chamber. Since the CO2 in the steel cylinder is high-purity liquid CO2 at normal temperature and high pressure, after being decompressed by the pressure reducing valve, the gaseous CO2 will absorb the surrounding heat and cause the temperature to drop. Compared with the previous gas-liquid equilibrium device, the gas preparation chamber in the present invention can make the CO2 exchange heat with the water in the water bath faster through the heat exchange fins, so as to reach stability faster and effectively improve the experimental efficiency.

[0018] 2. The present application realizes the efficient balance and high-precision control of the measurement system by setting a CO2 input valve, a CO2 output valve, a gas passage chamber, and a CO2 bypass valve. The steel plate with tiny conical holes set in the gas passage chamber can effectively control the gas flow rate after the CO2 input valve is opened, thereby realizing the slow transition of the pressure between the gas tank and the liquid tank, effectively prolonging the pressure change time, providing sufficient time for the opening and closing of the valves, and effectively improving the experimental accuracy. In addition, by setting a CO2 bypass valve, it helps the system to quickly load carbon dioxide into the liquid tank when the first parameter measurement of the absorbent is carried out.

[0019] 3. The present application is provided with a vacuum-driven absorbent buffer chamber, which can automatically let the absorbent enter the absorbent buffer chamber under the action of pressure, improving the degree of automation compared with the previous manual injection and pump injection.

[0020] 4. The present application is provided with flush pipes arranged obliquely and staggeredly in the liquid tank. After the experiment is over, pure water is sprayed into the liquid tank through a flush water pump to clean the inside of the liquid tank, preventing the increase in measurement result errors caused by absorbent residue. In addition, through the negative pressure effect, the cleaning of the absorbent pipeline and the absorbent buffer chamber is realized. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the gas-liquid equilibrium reaction parameter measurement device in the preferred embodiment of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the gas preparation chamber in the preferred embodiment of the present invention;

[0023] Figure 3 It is a schematic layout structural diagram of the flush pipes in the liquid tank in the preferred embodiment of the present invention.

[0024] Reference Numerals: 1 - CO2 gas cylinder, 2 - gas pressure reducing valve, 3 - gas preparation chamber, 4 - three-way valve, 5 - vacuum pump, 6 - gas tank, 7 - CO2 input valve, 8 - CO2 output valve, 9 - CO2 bypass valve, 10 - gas passage chamber, 11 - liquid tank, 12 - second pressure sensor, 13 - second temperature sensor, 14 - pressure relief valve, 15 - flush pipe, 16 - flush water pump, 17 - flush water tank, 18 - drain valve, 19 - absorbent storage tank, 20 - absorbent input valve, 21 - absorbent buffer chamber, 22 - absorbent output valve, 23 - magnetic stirrer, 24 - water bath device, 25 - first pressure sensor, 26 - first temperature sensor. Detailed Embodiments

[0025] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0026] Referring to Figures 1 - 3 As shown, in a preferred embodiment of the present invention, a device for measuring gas-liquid equilibrium reaction parameters includes a high-purity CO2 gas cylinder 1. The output end of the CO2 gas cylinder 1 is connected to a water bath device 24. A gas preparation chamber 3 communicating with the CO2 gas cylinder 1 is provided inside the water bath device 24. The output end of the gas preparation chamber 3 is sequentially connected to a gas tank 6, a gas passage chamber 10, and a liquid tank 11. A flushing water tank 17 for flushing the liquid tank 11 and an absorbent storage tank 19 for providing an absorbent are connected to the liquid tank 11 outside the water bath device 24, thereby improving the measurement accuracy of the gas-liquid equilibrium reaction parameter measurement device for carbon dioxide capture absorbent and realizing the automatic cleaning of the device.

[0027] As a preferred embodiment of the present invention, it may also have the following additional technical features: A gas pressure reducing valve 2 is installed on the pipeline between the CO2 gas cylinder 1 and the gas preparation chamber 3. A three-way valve 4 is provided at the output end of the gas preparation chamber 3 and is respectively connected to a first evacuation pipeline and the gas tank through the three-way valve 4. A vacuum pump 5 is installed on the first evacuation pipeline.

[0028] By arranging the gas preparation chamber 3 behind the gas pressure reducing valve 2, placing it below the liquid level inside the water bath device 24, connecting it to the three-way valve 4, and providing heat exchange fins on the surface to enhance the heat exchange effect and reduce the experimental waiting time, the function of the gas preparation chamber is to quickly heat the pure CO2 released and depressurized from the CO2 steel cylinder.

[0029] In this embodiment, a first temperature sensor 26 and a first pressure sensor 25 are provided on the gas tank 6.

[0030] In this embodiment, a steel plate is provided inside the gas passage chamber 10, and micro-conical holes are opened on the steel plate. The conical holes are located at the bottom left and top right of the steel plate. Thus, the flow rate of CO2 can be slowed down through the action of the conical holes, improving the experimental measurement accuracy.

[0031] In this embodiment, a CO2 input valve 7 is installed on the pipeline between the gas tank 6 and the gas passage chamber 10, and a CO2 output valve 8 is installed on the pipeline between the gas passage chamber 10 and the liquid tank 11. A CO2 bypass valve is installed on the pipeline between the gas tank and the liquid tank, and the CO2 bypass valve is arranged in parallel with the CO2 input valve and the CO2 output valve. Among them, the CO2 input valve 7 and the CO2 output valve 8 work during measurement and are connected in parallel with the CO2 bypass valve 9. The CO2 bypass valve 9 works in the preparation stage and is normally closed during measurement.

[0032] In this embodiment, an absorbent buffer chamber 21 is connected between the liquid tank 11 and the absorbent storage tank 19. An absorbent input valve 20 and an absorbent output valve 22 are respectively installed on the input pipeline and the output pipeline of the absorbent buffer chamber 21. That is, the absorbent buffer chamber 21 is connected to the absorbent storage tank 19 through the absorbent input valve 20. The absorbent storage tank is an open container. The absorbent buffer chamber 21 is connected to the liquid tank through the absorbent output valve 22. The absorbent output valve 22 is opened when the system is evacuated and closed after the evacuation is completed. The absorbent input valve 20 is closed when the system is evacuated and opened after the evacuation is completed. By the absorbent input valve 20 and the absorbent output valve 22 working at different times, the absorbent buffer chamber 21 is provided with an automatic quantitative extraction function.

[0033] In this embodiment, a second pressure sensor 45, a second temperature sensor 13, a pressure relief valve 14, and a magnetic stirrer 23 are provided on the liquid tank 11; a second drain pipe is provided at the bottom of the liquid tank, and a drain valve 18 is installed on the second drain pipe.

[0034] In this embodiment, a flushing water pump 16 is provided at the output end of the flushing water tank 17. Two flushing pipes 15 are provided at the output end of the flushing water pump 16. The tops of the two flushing pipes 15 are inserted from both sides above the liquid tank 11 and are arranged in a staggered manner. Its function is to flush the inside of the liquid tank 11 after the experiment. The staggered distribution structure can improve the flushing efficiency.

[0035] Working principle of the present invention: When in use, check the closing conditions of the valves in the system before starting the machine. All valves need to be in the closed state. 30 g of the prepared absorbent to be measured is loaded into the absorbent storage tank 19. After the system is started, the operation of all equipment in the system is executed under the control of a computer, and the following operations are all automatically performed.

[0036] The opening direction of the three-way valve 4 is switched to the directions of the vacuum pump 5 and the gas preparation chamber 3. The vacuum pump 5 starts to operate, evacuating the pipeline connected to the gas preparation chamber 3. When the pressure sensor in the vacuum pump 5 drops to -0.2 bar, the evacuation stops, and the three-way valve 4 is switched to the directions of the vacuum pump 5 and the gas cylinder 6. At this time, the CO2 gas cylinder is opened, and the gas pressure reducing valve 2 is adjusted to 0.4 MPa. CO2 will enter the gas preparation chamber 3 through the pipeline and be heated by the water in the water bath. Subsequently, the CO2 input valve 7, the CO2 output valve 8, the CO2 bypass valve 9, and the absorbent output valve 22 are opened. The vacuum pump 5 is turned on to reduce the pressure in the system to 0.2 bar, and the absorbent output valve 22 is closed. At this time, the absorbent buffer chamber 21 is under negative pressure.

[0037] The absorbent input valve 20 is opened, and the liquid in the absorbent storage tank 19 is drawn into the absorbent buffer chamber 21. The absorbent input valve 20 is closed. At this time, the volume of the absorbent measured in the experiment can be accurately calculated through the absorbent buffer chamber 21 and the connected pipelines. The CO2 input valve 7, the CO2 output valve 8, and the CO2 bypass valve 9 are closed, cutting off the pressure balance between the gas cylinder 6 and the liquid tank 11. The absorbent output valve 22 is opened. Due to the negative pressure in the liquid tank 11, all the absorbent in the absorbent buffer chamber 21 is drawn into the liquid tank 11. The absorbent output valve 22 is closed, and the pressure relief valve 14 is opened to restore normal pressure in the liquid tank 11. The pressure relief valve 14 is closed. At this time, the absorbent is continuously heated by the water bath. After the pressure and temperature are stable, the pressure and temperature data are recorded. The opening direction of the three-way valve 4 is switched to the directions of the gas preparation chamber 3 and the gas cylinder 6. At this time, the preheated CO2 will quickly fill the gas cylinder 6 through the pipeline. During the process of filling the gas cylinder 6, the pressure decreases slightly, and the temperature rises slightly. With the heat exchange fins on the gas preparation chamber 3, the temperature can quickly reach equilibrium. After the temperature and pressure in the gas cylinder are stable, the data is recorded, and the experimental preparation is completed.

[0038] At the start of the experiment, the CO2 bypass valve 9 is opened. When the pressure readings in the gas cylinder 6 and the liquid tank 11 are the same, the CO2 bypass valve 9 is closed. At this time, the temperature and pressure in the gas cylinder 6 remain unchanged, while in the liquid tank 11, due to the reaction between CO2 and the absorbent, the temperature rises and the pressure decreases. When the temperature and pressure readings in the liquid tank 11 remain unchanged, it is considered that the absorbent reaches the gas-liquid equilibrium state. The current absorbent CO2 loading can be calculated based on the temperature and pressure data of the gas cylinder 6 and the liquid tank 11 at this time, which is the initial equilibrium loading.

[0039] Open the CO2 input valve 7 and the CO2 output valve 8 simultaneously. Since the gas passes through the room with negative pressure during the experimental preparation stage, when the CO2 input valve 7 and the CO2 output valve 8 are opened, the CO2 in the gas tank 6 and the liquid tank 11 will flow into both sides of the gas passage chamber 10 respectively. However, due to the existence of the conical holes, the CO2 with higher pressure on the left side of the gas passage chamber cannot pass through in large quantities. Therefore, the pressure in the liquid tank 11 rises slowly, and it can be considered that each instantaneous absorbent is in a gas-liquid equilibrium state. At this time, the gas-liquid equilibrium data at each instant can be calculated based on the temperature and pressure readings of the gas tank 6 and the liquid tank 11. Stop the experiment when the pressure in the liquid tank 11 reaches 0.2 Mpa.

[0040] After the experiment is completed, open the CO2 bypass valve 9. At this time, the remaining CO2 in the gas tank 6 will enter the liquid tank 11. For the drain valve 18 at the bottom of the liquid tank 11, the absorbent will be discharged from the liquid tank 11 under the action of pressure. Clean the absorbent storage tank 19, fill the absorbent storage tank 19 with pure water, close the drain valve 18, open the absorbent output valve 22 and the vacuum pump 5, and close the vacuum pump 5 when the pressure in the system drops to 0.2 bar. Open the absorbent input valve 20. Under the action of pressure, the water in the absorbent storage tank 19 will be pumped into the liquid tank 11. During the flow of the water, the absorbent buffer chamber 21 and its connected pipelines can be fully cleaned. Subsequently, open the flushing water pump 16. The water in the flushing water tank 17 will be sprayed into the interior of the liquid tank 11 via the flushing water pump 16. And due to the oblique arrangement of the flushing pipe 15, the water flow will rotate and leave along the interior of the liquid tank 11, thereby fully cleaning the interior of the liquid tank 11. Finally, drain through the drain valve 18 to end the cleaning, and close all valves.

[0041] On the premise of no conflict, those skilled in the art can freely combine and superimpose the above additional technical features.

[0042] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A gas-liquid equilibrium reaction parameter measuring device, characterized in that: It includes a high-purity CO2 gas cylinder, the output end of which is connected to a water bath device, the water bath device is provided with a gas preparation chamber connected to the CO2 gas cylinder, the output end of the gas preparation chamber is connected in sequence to a gas tank, a gas passing chamber, and a liquid tank, the liquid tank is connected to a flushing water tank arranged outside the water bath device for flushing the liquid tank, and an absorbent storage tank for providing absorbent.

2. The gas-liquid equilibrium reaction parameter measuring device according to claim 1, characterized in that: A gas pressure reducing valve is installed on the pipeline between the CO2 gas cylinder and the gas preparation room.

3. The gas-liquid equilibrium reaction parameter measuring device according to claim 1, characterized in that: A three-way valve is provided at the output end of the gas preparation chamber, through which a first exhaust pipe and the gas tank are respectively connected, and a vacuum pump is installed on the first exhaust pipe.

4. The gas-liquid equilibrium reaction parameter measuring device according to claim 3, characterized in that: The gas tank is provided with a first temperature sensor and a first pressure sensor.

5. The gas-liquid equilibrium reaction parameter measuring device according to claim 3, characterized in that: A steel plate is arranged inside the gas passage chamber, and tiny conical holes are opened on the steel plate. The conical holes are located at the bottom of the left side of the steel plate and the top of the right side of the steel plate.

6. The gas-liquid equilibrium reaction parameter measuring device according to claim 3, characterized in that: A CO2 input valve is installed on the pipeline between the gas tank and the gas passage chamber, and a CO2 output valve is installed on the pipeline between the gas passage chamber and the liquid tank.

7. The gas-liquid equilibrium reaction parameter measuring device according to claim 3, characterized in that: A CO2 bypass valve is installed on the pipeline between the gas tank and the liquid tank, and the CO2 bypass valve is arranged in parallel with the CO2 input valve and the CO2 output valve.

8. The gas-liquid equilibrium reaction parameter measuring device according to claim 1, characterized in that: An absorbent buffer chamber is connected between the liquid tank and the absorbent storage tank, and an absorbent input valve and an absorbent output valve are respectively installed on the input pipe and the output pipe of the absorbent buffer chamber.

9. The gas-liquid equilibrium reaction parameter measuring device according to claim 8, characterized in that: The liquid tank is provided with a second pressure sensor, a second temperature sensor, a pressure relief valve, and a magnetic stirrer; the bottom of the liquid tank is provided with a second drain pipe, and the second drain pipe is installed with a drain valve.

10. The gas-liquid equilibrium reaction parameter measuring device according to claim 1, characterized in that: A flushing water pump is provided at the output end of the flushing water tank, and two flushing pipes are provided at the output end of the flushing water pump. The tops of the two flushing pipes are inserted from both sides above the liquid tank and are distributed in a staggered manner.

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