Equipment and methods for separating and purifying mixed gases

Abstract

This invention discloses a mixed gas separation and purification device comprising: a purification tower with a drain pipe at the bottom; an outlet device located at the top of the purification tower and connected to an exhaust pipe; a solvent box located at the bottom of the purification tower and containing an absorbent; an ultrasonic atomizing unit located within the solvent box; a reaction box, a box-shaped structure with its opening facing downwards, attached to the top of the solvent box; an aeration device located within the reaction box, directly above the solvent box; an inlet pipe connecting the reaction box to the aeration device and the fan device of the ultrasonic atomizing unit; and a pressure control outlet device connected to the outlet device, which adjusts the cross-sectional size of the outlet channel according to the increase in internal pressure of the purification tower. This invention allows for better contact between natural gas and the chemical reaction absorbent, and ensures that the used chemical reaction absorbent approaches its maximum absorption value, thereby improving the utilization rate of the chemical reaction absorbent and reducing the cost of reactivating it.

Description

Technical Field

[0001] This invention relates to the field of mixed gas treatment, and more specifically to mixed gas separation and purification equipment and methods. Background Technology

[0002] After natural gas is extracted from gas fields, it contains various impurity gases, such as carbon dioxide and hydrogen sulfide. To ensure that the concentration of natural gas meets the standard values, it is necessary to separate these impurity gases to improve the purity of the natural gas. Currently, the separation and purification of impurity gases in natural gas generally employs multiple methods, including adsorption, absorption, and chemical reactions.

[0003] Chemical reactions have advantages such as high efficiency and high separation rate. Currently, the separation method usually involves immersing natural gas in a chemical reaction absorbent. This method is highly dependent on the size and quantity of natural gas bubbles in the chemical reaction absorbent; otherwise, the treatment effect will be poor. At the same time, the absorption effect of the chemical reaction absorbent will deteriorate with the use of the absorbent. Replacing the chemical reaction absorbent in equal amounts at the same time will cause the absorbent to be discharged from the production line before reaching its maximum absorption value, resulting in waste of the absorbent or greatly increasing the processing capacity and cost of reactivating the absorbent. Summary of the Invention

[0004] In view of the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a mixed gas separation and purification device and method, which can better enable natural gas to contact the chemical reaction absorbent, and at the same time, the chemical reaction absorbent after use can be as close as possible to the maximum absorption value, thereby improving the utilization rate of the chemical reaction absorbent and reducing the cost of reactivating the chemical reaction absorbent.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A mixed gas separation and purification device, characterized in that it comprises:

[0007] The purification tower has a closed structure and a drain pipe at the bottom.

[0008] The outlet device is located at the top of the purification tower and is connected to the exhaust pipe;

[0009] The solvent box is a box-shaped structure with its opening facing upwards. The upper part is located in the lower part of the purification tower, and the interior contains an absorbent.

[0010] An ultrasonic atomizing unit is installed inside the solvent box, with the atomizing plate located inside the absorbent to atomize the absorbent;

[0011] The reaction box, a box-shaped structure with its opening facing downwards, is located inside the purification tower and is fastened to the upper part of the solvent box; a gap is left between the lower end of the reaction box and the outer surface of the solvent box.

[0012] The aeration device is installed inside the reaction box, directly above the solvent box, with the air outlet facing the opening of the solvent box.

[0013] The air inlet pipe passes through the purification tower and reaction box and is connected to the aeration device and the fan device of the ultrasonic atomization unit;

[0014] The gas pressure control outlet device is connected to the outlet device and changes the cross-sectional size of the gas outlet channel of the outlet device according to the increase of the internal pressure of the purification tower.

[0015] Furthermore, the drain pipe is S-shaped, the inlet of the drain pipe is connected to the bottom of the purification tower, and the middle part of the drain pipe is higher than the inlet of the drain pipe;

[0016] The bottom of the purification tower is provided with an upward protrusion, and the solvent box is located inside the purification tower through the protrusion;

[0017] The air pressure control outlet device includes:

[0018] The floating ring is placed inside the purification tower, wrapped around the outside of the protrusion, and suspended on the absorbent condensed inside the purification tower.

[0019] Two pull ropes are symmetrically arranged on the floating ring; after the pressure inside the purification tower increases, the absorbent is discharged outward through the drain pipe, the floating ring is lowered, and the pull ropes are pulled downward to control the size of the gas outlet channel in the outlet device.

[0020] Furthermore, the outlet device includes:

[0021] The control tube is a continuous trapezoid, with its lower end connected to the bottom of the purification tower;

[0022] The lower end of the exhaust pipe is connected to the upper end of the control pipe, and the upper end is connected to the exhaust pipe.

[0023] A crossbar is installed inside the air outlet pipe;

[0024] The control spring is connected to the crossbar at its upper end.

[0025] The control component is located inside the control tube. Its upper end is connected to the upper end of the control spring, and its lower end is connected to two pull ropes. When the pull ropes are pulled downwards, the control component moves away from the control tube, thus expanding the flow cross-section of the control tube.

[0026] The pressure relief pipe is connected to the inside of the purification tower at one end via a one-way valve, and to the outside of the purification tower at the other end.

[0027] When the mixed gas is being stably purified, the pull rope is in a state of just being unstressed; when the control spring is not under tension, the control component will block the control tube.

[0028] The upward viscous force of the floating ring on the absorbent is less than the force exerted by the natural gas flow on the control component when the pressure inside the purification tower is greater than a predetermined multiple of the working pressure; when the control component closes the control pipe due to the upward force of the natural gas flow when the pressure inside the purification tower is greater than a predetermined multiple of the working pressure, the absorbent inside the purification tower is discharged through the drain pipe.

[0029] After the internal pressure of the purification tower exceeds the working pressure and continues to increase gradually, the floating ring separates from the absorbent, and then the control component closes the control tube.

[0030] Furthermore, the air pressure control outlet device also includes two rollers, which are installed inside the purification tower, and the two pull ropes are connected to the control component after being guided by the rollers.

[0031] Furthermore, the outer contour of the control component is spindle-shaped, and the pull rope is also connected to the pull rope via a fine-tuning spring.

[0032] Furthermore, the reaction box is in the shape of an inverted diamond, and the inner and outer surfaces of the reaction box and the inner surface of the purification tower are provided with several vertical condensation strips.

[0033] Several of the aforementioned condensing strips are arranged in rows with staggered intervals, and the height of the condensing strips is 3 to 8 millimeters.

[0034] Furthermore, it also includes a flow guide, which is disposed on the opening of the solvent box; the flow guide includes several concentric rings connected and fixed together; the diameter of the flow guide is larger than the diameter of the aeration device, and the aeration device is located directly above the flow guide.

[0035] Furthermore, the mixed gas separation and purification equipment also includes a mixing component disposed within the reaction chamber, the mixing component being located between the flow guide and the aeration device; the diameter of the mixing component is larger than that of the flow guide.

[0036] The mixing component includes a longitudinal plate and a transverse plate, the end faces of which are alternately connected and projected into a mesh structure; the surfaces of the longitudinal and transverse plates are parallel to the air outlet direction of the aeration device; the longitudinal and transverse plates are provided with a number of perforations; the centers of the perforations on adjacent longitudinal and transverse plates are misaligned.

[0037] Furthermore, the purification tower includes:

[0038] The solvent box, reaction box, and aeration device are located inside the inner tower.

[0039] The outer tower, with its outer shell inside the inner tower;

[0040] The mixed gas separation and purification equipment also includes:

[0041] The absorbent box is ring-shaped and located inside the outer tower, while the outlet of the drain pipe is located inside the absorbent box.

[0042] The liquid storage tank is located outside the outer tower, and the lower part of the absorbent box is connected to the liquid storage tank through a one-way valve.

[0043] The upper part of the absorbent box is also connected to the storage tank through a one-way valve. When the liquid in the upper part of the absorbent box reaches a certain height, it overflows into the storage tank.

[0044] It also includes a gas collection box, which is located outside the outer tower and is connected to a pressure relief pipe via a pressure regulating valve. The gas collection box is also connected to the inside of the outer tower via a check valve and a pressure regulating valve in sequence.

[0045] Furthermore, it includes the following steps:

[0046] S1. Adjust the elastic force of the fine-tuning spring according to the predetermined processing rate and pressure so that the inner tower pressure is 1.2 times the working pressure, the floating ring and absorbent stick together, and a gap is left between the control component and the control tube.

[0047] S2. Adjust the starting pressure of the pressure regulating valve on the pressure relief pipe so that its starting pressure is greater than the starting pressure of the pressure regulating valve on the pipeline connecting the gas collecting box and the outer tower.

[0048] S3. Close the exhaust pipe, inject fresh absorbent into the solvent box, and start the ultrasonic atomization unit to allow the absorbent to accumulate in the inner tower until the floating ring floats to the predetermined height.

[0049] S4. Open the exhaust pipe and simultaneously inject mixed gas into the aeration device through the air inlet pipe.

[0050] Because of the adoption of the above technical solution, the present invention has the following advantages:

[0051] 1. The chemical reaction absorbent is atomized by the ultrasonic atomization unit and then dispersed into the reaction box to come into contact with the natural gas. This allows the impurities in the natural gas to react fully with the chemical reaction absorbent, improving the removal rate of impurities. At the same time, the chemical reaction absorbent is atomized, and its small atomized particles can achieve the maximum absorption value in the reaction, thus being fully utilized.

[0052] 2. After the chemical reaction absorbent and natural gas are directly mixed by impact, they flow upwards after being turbulent downwards, which ensures that the two are fully mixed, prolongs the reaction time between the impurity gas and the chemical reaction absorbent, and improves the quality of natural gas treatment.

[0053] 3. When the inlet pipe pressure becomes unstable and increases, more natural gas enters the purification tower, and the pressure inside the tower also increases. At this time, the outlet device reduces the exhaust volume per unit time, allowing the natural gas to remain in the purification tower for a longer period, enabling it to come into more sufficient contact with the atomized chemical reaction absorbent. The longer residence time also allows for the addition of more atomized chemical reaction absorbent to the purification tower, ensuring that the increased natural gas pressure still reacts sufficiently with the absorbent. This prevents a significant decrease in the quality of the processed natural gas due to the increased inlet pipe pressure. The entire process is adaptively controlled and requires no manual or electronic control.

[0054] 4. After the pressure in the inlet pipe increases slightly, the natural gas can push the absorbent at the bottom of the inner tower to be discharged, increasing the storage space of the natural gas in the inner tower, thereby reducing the pressure of the natural gas and playing a certain role in depressurization. At the same time, after increasing the space, the newly added natural gas will not be directly discharged due to pressure relief, thus increasing the amount of natural gas processed.

[0055] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0056] The accompanying drawings of this invention are described below:

[0057] Figure 1 This is a cross-sectional view of the mixed gas separation and purification equipment in the embodiment.

[0058] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0059] Figure 3 for Figure 1 Enlarged structural diagram at point B.

[0060] Figure 4 for Figure 1 Enlarged structural diagram at point C.

[0061] Figure 5 This is a magnified schematic diagram of the surface structure of the reaction box in the embodiment.

[0062] Figure 6 This is a top view of the flow guide in the embodiment.

[0063] Figure 7 This is a top view of the hybrid component in the example.

[0064] Figure 8This is a magnified cross-sectional view of the hybrid component in the embodiment.

[0065] In the diagram: 11. Inner tower; 111. Protrusion; 12. Outer tower; 2. Drain pipe; 31. Control pipe; 32. Gas outlet pipe; 33. Crossbar; 34. Control spring; 35. Control component; 36. Pressure relief pipe; 4. Exhaust pipe; 5. Solvent box; 6. Ultrasonic atomization unit; 7. Reaction box; 8. Aeration device; 9. Air inlet pipe; 101. Float ring; 102. Pull rope; 103. Roller; 104. Fine-tuning spring; 201. Condensation strip; 202. Flow guide; 203. Mixing assembly; 2031. Vertical plate; 2032. Horizontal plate; 2033. Perforation; 204. Absorbent box; 205. Storage tank; 206. Gas collection box; 207. One-way valve; 208. Pressure regulating valve; 209. Absorbent. Detailed Implementation

[0066] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0067] Example:

[0068] like Figures 1 to 5 As shown, the mixed gas separation and purification equipment is characterized by comprising:

[0069] The purification tower has a closed structure and a drain pipe 2 at the bottom.

[0070] The outlet device is located at the top of the purification tower and is connected to the exhaust pipe 4;

[0071] Solvent box 5 is a box-shaped container with its opening facing upwards. The upper part is located in the lower part of the purification tower, and the absorbent 209 is contained inside.

[0072] The ultrasonic atomizing unit 6 is set inside the solvent box 5, and the atomizing plate is located inside the absorbent 209 to atomize the absorbent 209.

[0073] The reaction box 7, which is a box-shaped container with its opening facing downwards, is located inside the purification tower and is fastened to the upper part of the solvent box 5; a gap is left between the lower end of the reaction box 7 and the outer surface of the solvent box 5.

[0074] The aeration device 8 is installed inside the reaction box 7, directly above the solvent box 5, with the air outlet facing the opening of the solvent box 5.

[0075] The air inlet pipe 9 passes through the purification tower and reaction box 7 and is connected to the aeration device 8 and the fan device of the ultrasonic atomization unit 6.

[0076] The gas pressure control outlet device is connected to the outlet device and changes the cross-sectional size of the gas outlet channel of the outlet device according to the increase of the internal pressure of the purification tower.

[0077] In this embodiment, the drain pipe 2 is S-shaped, the inlet of the drain pipe 2 is connected to the bottom of the purification tower, and the middle part of the drain pipe 2 is higher than the inlet of the drain pipe 2.

[0078] The bottom of the purification tower is provided with an upward protrusion 111, and the solvent box 5 passes through the protrusion 111 and is located inside the purification tower;

[0079] The air pressure control outlet device includes:

[0080] The floating ring 101 is set inside the purification tower, wrapped around the outside of the protrusion 111, and suspended on the absorbent 209 condensed inside the purification tower.

[0081] Two pull ropes 102 are symmetrically arranged on the floating ring 101. After the pressure inside the purification tower increases, the absorbent 209 is discharged outward through the drain pipe 2, the floating ring 101 is lowered, and the pull ropes 102 are pulled downward to control the size of the gas outlet channel in the outlet device.

[0082] In this embodiment, the outlet device includes:

[0083] The control tube 31 is a through trapezoid, with its lower end connected to the bottom of the purification tower;

[0084] The lower end of the exhaust pipe 32 is connected to the upper end of the control pipe 31, and the upper end is connected to the exhaust pipe 4.

[0085] The crossbar 33 is installed inside the air outlet pipe 32;

[0086] The control spring 34 is connected at its upper end to the crossbar 33;

[0087] The control element 35 is installed inside the control tube 31. Its upper end is connected to the upper end of the control spring 34, and its lower end is connected to the two pull ropes 102. When the pull ropes 102 are pulled downward, the control element 35 moves away from the control tube 31, thereby expanding the flow cross-section of the control tube 31.

[0088] The pressure relief pipe 36 is connected to the inside of the purification tower at one end through a one-way valve 207, and to the outside of the purification tower at the other end.

[0089] When the mixed gas is being stably purified, the pull rope 102 is in a state of just being unstressed; when the control spring 34 is not under tension, the control component 35 blocks the control tube 31.

[0090] The upward viscous force of the floating ring 101 on the absorbent 209 is less than the force exerted by the natural gas flow on the control element 35 when the pressure inside the purification tower is greater than a predetermined multiple of the working pressure; when the control element 35 closes the control pipe 31 due to the upward force of the natural gas flow when the pressure inside the purification tower is greater than a predetermined multiple of the working pressure, the absorbent 209 inside the purification tower is discharged through the drain pipe 2;

[0091] After the internal pressure of the purification tower exceeds the working pressure and continues to increase gradually, the floating ring 101 separates from the absorbent 209, and then the control component 35 closes the control tube 31.

[0092] In this embodiment, the air pressure control outlet device further includes two rollers 103, which are installed inside the purification tower. The two pull ropes 102 are guided by the rollers 103 and connected to the control component 35.

[0093] In this embodiment, the outer contour of the control component 35 is spindle-shaped, and the pull rope 102 is also connected to the pull rope 102 through the fine-tuning spring 104.

[0094] The spindle shape can reduce airflow resistance, and the fine-tuning spring 104 can change the situation where the absorbent 209 stored in the inner tower 11 is lowered to a certain height and then continues to be lowered, so that the floating ring 101 is still in a semi-suspended state, thereby controlling the force on the control component 35.

[0095] In this embodiment, the reaction box 7 is in the shape of an inverted diamond, and the inner and outer surfaces of the reaction box 7 and the inner surface of the purification tower are provided with a number of vertical condensation strips 201.

[0096] Several of the aforementioned condensing strips 201 are arranged in a row with staggered intervals, and the height of the condensing strips 201 is 3 to 8 millimeters.

[0097] In this embodiment, a flow guide 202 is also included, which is disposed on the opening of the solvent box 5; the flow guide 202 includes a plurality of concentric rings connected and fixed together; the diameter of the flow guide 202 is larger than the diameter of the aeration device 8, and the aeration device 8 is located directly above the flow guide 202.

[0098] The flow guide 202 can evenly distribute the atomized absorbent 209.

[0099] In this embodiment, the mixed gas separation and purification equipment further includes a mixing component 203 disposed in the reaction box 7, the mixing component 203 being located between the flow guide 202 and the aeration device 8; the diameter of the mixing component 203 is larger than that of the flow guide 202;

[0100] The mixing component 203 includes a longitudinal plate 2031 and a transverse plate 2032, the end faces of which are alternately connected and projected into a mesh structure; the plate surfaces of the longitudinal plate 2031 and the transverse plate 2032 are parallel to the air outlet direction of the aeration device 8; the longitudinal plate 2031 and the transverse plate 2032 are provided with a plurality of perforations 2033; the centers of the perforations 2033 on adjacent longitudinal plates 2031 and transverse plates 2032 are misaligned.

[0101] The mixing component 203 allows the atomized absorption and natural gas to be fully mixed upon first contact, without the presence of gas clumps due to the airflow, thus improving the impurity removal efficiency and quality.

[0102] In this embodiment, the purification tower includes:

[0103] The inner tower 11, solvent box 5, reaction box 7, and aeration device 8 are installed inside the inner tower 11;

[0104] Outer tower 12, the outer casing is inside inner tower 11;

[0105] The mixed gas separation and purification equipment also includes:

[0106] The absorbent box 204 is ring-shaped and located inside the outer tower 12, outside the inner tower 11. The outlet of the drain pipe 2 is located inside the absorbent box 204.

[0107] The liquid storage tank 205 is located outside the outer tower 12, and the lower part of the absorbent box 204 is connected to the liquid storage tank 205 through a one-way valve 207.

[0108] The upper part of the absorbent box 204 is also connected to the storage tank 205 through a one-way valve 207. When the liquid in the upper part of the absorbent box 204 reaches a certain height, it overflows into the storage tank 205.

[0109] It also includes a gas collection box 206, which is located outside the outer tower 12 and is connected to the pressure relief pipe 36 through a pressure regulating valve 208. The gas collection box 206 is also connected to the inside of the outer tower 12 in sequence through a one-way valve 207 and a pressure regulating valve 208.

[0110] The mixed gas separation and purification equipment in this embodiment is used as follows: the elastic force of the fine-tuning spring 104 is adjusted according to the predetermined processing rate and pressure so that the pressure in the inner tower 11 is 1.2 times the working pressure, the floating ring 101 and the absorbent 209 stick together, and a gap is left between the control component 35 and the control tube 31.

[0111] This ensures that the equipment can still operate normally when the pressure fluctuates around the predetermined value of the maximum working pressure, without the control component 35 blocking the control tube 31 and causing the equipment to stop purifying.

[0112] Adjust the starting pressure of the pressure regulating valve 208 on the pressure relief pipe 36 so that its starting pressure is greater than the starting pressure of the pressure regulating valve 208 on the pipeline connecting the gas collecting box 206 and the outer tower 12. In this way, when the outer tower 12 connected to the gas collecting box 206 no longer meets the pressure relief requirements, the inner tower 11 can be depressurized simultaneously, avoiding premature depressurization when there is still absorbent 209 in the inner tower 11, which would result in the natural gas not being processed.

[0113] Close the exhaust pipe 4, inject fresh absorbent 209 into the solvent box 5, and start the ultrasonic atomization unit 6 so that the absorbent 209 accumulates in the inner tower 11 until the floating ring 101 floats to the predetermined height; at this time, the control component 35 is at a suitable height in the control tube 31, which can control the flow rate of the exhaust pipe 4.

[0114] Open the exhaust pipe 4 and simultaneously inject mixed gas into the aeration device 8 through the air inlet pipe 9.

[0115] After the atomized absorbent 209 is dispersed by the guide 202, it impacts the natural gas in the mixing component 203. The impacted mixed gas flows along the perforation 2033, which makes it better mixed.

[0116] The mixed gas flows downward under pressure and exits the reaction chamber 7, then flows upward into the outlet device and is discharged through the exhaust pipe 4.

[0117] After the discharged gas passes through the separator, the absorbent 209 and natural gas are separated to obtain purified natural gas. The absorbed gas reacts with the reactant or is absorbed and can be obtained through other treatment methods.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A mixed gas separation and purification device, characterized in that, include: The purification tower has a closed structure and a drain pipe at the bottom. The outlet device is located at the top of the purification tower and is connected to the exhaust pipe; The solvent box is a box-shaped structure with its opening facing upwards. The upper part is located in the lower part of the purification tower, and the interior contains an absorbent. An ultrasonic atomizing unit is installed inside the solvent box, with the atomizing plate located inside the absorbent to atomize the absorbent; The reaction box, a box-shaped structure with its opening facing downwards, is located inside the purification tower and is fastened to the upper part of the solvent box; a gap is left between the lower end of the reaction box and the outer surface of the solvent box. The aeration device is installed inside the reaction box, directly above the solvent box, with the air outlet facing the opening of the solvent box. The air inlet pipe passes through the purification tower and reaction box and is connected to the aeration device and the fan device of the ultrasonic atomization unit; A pressure control outlet device is connected to the outlet device, and the cross-sectional size of the outlet channel of the outlet device is changed according to the increase of the internal pressure of the purification tower. The drain pipe is S-shaped, the inlet of the drain pipe is connected to the bottom of the purification tower, and the middle part of the drain pipe is higher than the inlet of the drain pipe. The bottom of the purification tower is provided with an upward protrusion, and the solvent box is located inside the purification tower through the protrusion; The air pressure control outlet device includes: The floating ring is placed inside the purification tower, wrapped around the outside of the protrusion, and suspended on the absorbent condensed inside the purification tower. Two pull ropes are symmetrically set on the floating ring; after the pressure inside the purification tower increases, the absorbent is discharged outward through the drain pipe, the floating ring is lowered, and the pull ropes are pulled downward to control the size of the gas outlet channel in the outlet device. The outlet device includes: The control tube is a continuous trapezoid, with its lower end connected to the bottom of the purification tower; The lower end of the exhaust pipe is connected to the upper end of the control pipe, and the upper end is connected to the exhaust pipe. A crossbar is installed inside the air outlet pipe; The control spring is connected to the crossbar at its upper end. The control component is located inside the control tube. Its upper end is connected to the upper end of the control spring, and its lower end is connected to two pull ropes. When the pull ropes are pulled downwards, the control component moves away from the control tube, thus expanding the flow cross-section of the control tube. The pressure relief pipe is connected to the inside of the purification tower at one end via a one-way valve, and to the outside of the purification tower at the other end. When the mixed gas is being stably purified, the pull rope is in a state of just being unstressed; when the control spring is not under tension, the control component will block the control tube. The upward viscous force of the floating ring on the absorbent is less than the force exerted by the natural gas flow on the control component when the pressure inside the purification tower is greater than a predetermined multiple of the working pressure; when the control component closes the control pipe due to the upward force of the natural gas flow when the pressure inside the purification tower is greater than a predetermined multiple of the working pressure, the absorbent inside the purification tower is discharged through the drain pipe. After the internal pressure of the purification tower exceeds the working pressure and continues to increase gradually, the floating ring separates from the absorbent, and then the control component closes the control tube.

2. The mixed gas separation and purification equipment according to claim 1, characterized in that, The air pressure control outlet device also includes two rollers, which are installed inside the purification tower. The two pull ropes are guided by the rollers and then connected to the control component.

3. The mixed gas separation and purification equipment according to claim 2, characterized in that, The outer contour of the control component is spindle-shaped, and the pull rope is also connected to the pull rope through a fine-tuning spring.

4. The mixed gas separation and purification equipment according to claim 3, characterized in that, The reaction box is in the shape of an inverted diamond, and the inner and outer surfaces of the reaction box and the inner surface of the purification tower are provided with several vertical condensation strips. Several of the aforementioned condensing strips are arranged in rows with staggered intervals, and the height of the condensing strips is 3 to 8 millimeters.

5. The mixed gas separation and purification equipment according to claim 4, characterized in that, It also includes a flow guide, which is disposed on the opening of the solvent box; the flow guide includes several concentric rings connected and fixed together; the diameter of the flow guide is larger than the diameter of the aeration device, and the aeration device is located directly above the flow guide.

6. The mixed gas separation and purification equipment according to claim 5, characterized in that, The mixed gas separation and purification equipment also includes a mixing component disposed within the reaction chamber, the mixing component being located between the flow guide and the aeration device; the diameter of the mixing component is larger than that of the flow guide. The mixing component includes a longitudinal plate and a transverse plate, the end faces of which are alternately connected and projected into a mesh structure; the surfaces of the longitudinal and transverse plates are parallel to the air outlet direction of the aeration device; the longitudinal and transverse plates are provided with a number of perforations; the centers of the perforations on adjacent longitudinal and transverse plates are misaligned.

7. The mixed gas separation and purification equipment according to claim 6, characterized in that, The purification tower includes: The solvent box, reaction box, and aeration device are located inside the inner tower. The outer tower, with its outer shell inside the inner tower; The mixed gas separation and purification equipment also includes: The absorbent box is ring-shaped and located inside the outer tower, while the outlet of the drain pipe is located inside the absorbent box. A liquid storage tank is located outside the outer tower, and the lower part of the absorbent box is connected to the liquid storage tank through a one-way valve. The upper part of the absorbent box is also connected to the storage tank through a one-way valve. When the liquid in the upper part of the absorbent box reaches a certain height, it overflows into the storage tank. It also includes a gas collection box, which is located outside the outer tower and is connected to a pressure relief pipe via a pressure regulating valve. The gas collection box is also connected to the inside of the outer tower via a check valve and a pressure regulating valve in sequence.

8. The method of using the mixed gas separation and purification equipment according to claim 7, characterized in that, Includes the following steps: S1. Adjust the elastic force of the fine-tuning spring according to the predetermined processing rate and pressure so that the inner tower pressure is 1.2 times the working pressure, the floating ring and absorbent stick together, and a gap is left between the control component and the control tube. S2. Adjust the starting pressure of the pressure regulating valve on the pressure relief pipe so that its starting pressure is greater than the starting pressure of the pressure regulating valve on the pipeline connecting the gas collecting box and the outer tower. S3. Close the exhaust pipe, inject fresh absorbent into the solvent box, and start the ultrasonic atomization unit to allow the absorbent to accumulate in the inner tower until the floating ring floats to the predetermined height. S4. Open the exhaust pipe and simultaneously inject mixed gas into the aeration device through the air inlet pipe.

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