Sectional type circulating tower and use method thereof

Abstract

The invention provides a sectional type circulating tower and a using method thereof, and relates to the field of circulating towers, the sectional type circulating tower comprises an upper tower body and a lower tower body, the upper tower body comprises an upper section, a middle section and a lower section, the upper section is provided with a liquid inlet and a second outlet, a partition plate is arranged in the lower section, and a hole allowing gas to pass through is formed in the center of the partition plate; a gas inlet is formed in the position, close to the top end, of the lower tower body, a desublimation object bearing device is arranged in the lower tower body, a cold object inlet and outlet is formed in the bottom end of the lower tower body, an original gas inlet is formed in the first communicating piece, when the CO2 concentration is lower than a threshold value, the first communicating piece exhausts gas, and otherwise, the original gas inlet is formed in the second communicating piece. According to the invention, the dry ice generated in the first stage is used as a high-concentration CO2 environment in the second stage, the structure is compact, and the safety is improved. The gas is introduced into the gas inlet, the second communicating piece is communicated with the liquid inlet, an organic amine regeneration system is arranged on the second communicating piece, and the third communicating piece is used for heating the gas and introducing the gas into the gas inlet.

Description

Technical Field

[0001] This invention relates to the field of circulation towers, and more particularly to a segmented circulation tower and its method of use. Background Technology

[0002] Carbon capture and chemical utilization (CCU) technology controls carbon emissions while simultaneously utilizing CO2 as a resource, aligning with sustainable development strategies and the circular economy, and has become a field of great interest to both academia and industry. Carbon capture and chemical utilization (DAC) technology, as a truly "carbon-negative" technology, more effectively reduces global atmospheric CO2 concentrations by directly capturing CO2 from the atmosphere. Therefore, the integration of DAC and CCU technologies can provide crucial support for achieving the "dual carbon" goal.

[0003] Direct air capture (DAC) technologies mainly include freezing, membrane separation, electrochemical methods, solid-state adsorption, and chemical absorption. Chemical absorption involves absorbing CO2 with an absorbent and then regenerating the absorbent using a series of regeneration technologies to recover the CO2. However, due to the extremely low CO2 content in the air (only 0.04%), DAC places higher demands on capture materials and equipment. Currently, materials used for direct air capture mainly include amine-functionalized materials, alkaline / alkaline earth metal hydroxides and carbonates, molecular sieves, metal-organic frameworks, and hygroscopic adsorption materials, with the first two showing significant application potential.

[0004] In liquid absorption processes, organic amines can react with CO2 to form carbamates, which can efficiently and rapidly absorb CO2 from the air. Furthermore, CAMPER et al., by mixing room-temperature ionic liquids (RTILs) with commercial amines and then heating and reducing pressure, facilitated the easy release of CO2 absorbed in the RTIL carbamate salt mixture. This process can capture CO2 under various conditions and in various processes, but it has higher energy efficiency than a single amine solution. In addition, chemical absorption processes based on ethanolamine organic amine solutions have been widely used in flue gas capture.

[0005] Studies have found that alkanolamines have a high affinity for CO2, meeting the conditions for direct CO2 capture from the air. Therefore, amine solution carbon capture (DAC) technology has been considered a feasible DAC technology in recent years. Experimental results by Barzagli et al. show that primary and secondary amine solutions exhibit relatively good DAC performance, both capable of absorbing 84%–89% of CO2 from the air, with low regeneration energy. Furthermore, researchers have found that the CO2 absorption performance of MEA, EMEA, DGA, and AMP decreases in that order. In DAC adsorbent research, amine-based adsorbents have become a research hotspot due to their good adsorption selectivity under low CO2 concentration conditions. Simultaneously, amine-based adsorbents have good application prospects due to their lower regeneration temperature. With amine adsorbents, adsorption and desorption processes alternate within a single unit, resulting in higher efficiency and shorter operating time, potentially reducing the cost of DAC systems. While organic amine solvents such as monoethanolamine have broad applications in flue gas carbon capture, the extremely low CO2 content in the air and the very small liquid-to-gas ratio during capture lead to significant amine liquid loss and increased operating costs when processing large amounts of air feed gas. However, ICCU technology still faces energy bottlenecks and low added value of products. Although ICCU simplifies the process, high-temperature reactions (such as DRM requiring 600–1000°C) still rely on external energy, and hydrogen sources (such as green hydrogen) are expensive. ICCU currently mainly produces C1 products (such as CH4 and CO), and the synthesis of high-value-added chemicals (such as methanol and multicarbon hydrocarbons) is limited by the complexity of reaction pathways and thermodynamic barriers.

[0006] Therefore, it is necessary to provide a new segmented circulation tower and its usage method to solve the above-mentioned technical problems. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a segmented circulation tower and its usage method.

[0008] The segmented circulating tower provided by the present invention includes an upper tower body and a lower tower body. The upper tower body includes an upper section, a middle section and a lower section. The upper section is provided with a liquid inlet and an outlet. The middle section is provided with multiple tray devices. The lower section is provided with a baffle plate. The baffle plate has a hole in the center that allows gas to pass through. An outlet is provided on the outer wall of the lower section corresponding to the baffle plate. An air inlet is provided near the top of the lower tower body. A condensate support device is provided inside the lower tower body. A cold material inlet and outlet are provided at the bottom of the lower tower body. It also includes a first connecting member for connecting outlet one and air inlet. The first connecting member is provided with a raw gas inlet. When the CO2 concentration is below the threshold, the first connecting member discharges gas; otherwise, the gas is introduced into the air inlet. The first connecting member is connected to a second connecting member, which is connected to a liquid inlet. The second connecting member is provided with an organic amine regeneration system. A third connecting member is connected between outlet two and air inlet. The third connecting member is used to heat the gas and introduce it into the air inlet.

[0009] Preferably, the tray device includes a support tray, multiple large bubble caps and multiple small bubble caps. The support tray has multiple overflow holes around its edge. The multiple large bubble caps and multiple small bubble caps are all installed on the support tray. The small bubble cap includes an outer cylinder and a top plate. The outer cylinder is fixed to a through hole in the support tray. One end of the top plate is hinged to the outer cylinder and covers the top of the outer cylinder.

[0010] Preferably, the large bubble cover includes an inner cylinder, an outer cover, and at least two insert rods. The inner cylinder is fixed to a through hole in the supporting tower plate, and the at least two insert rods are fixed to the inner cylinder. The outer cover is fitted onto the inner cylinder, and the at least two insert rods movably pass through the outer cover. A ring-shaped dividing frame is fixed at the bottom of the outer cover. The dividing frame has dividing holes, and the cross-section of the dividing frame is wavy.

[0011] Preferably, the first connecting component includes valve four, valve five, air pump one, valve six, valve twelve, valve sixteen, valve two, and a CO2 concentration detector. A connecting pipeline is provided between outlet one and air inlet. Valve four, valve five, air pump one, valve six, valve twelve, valve sixteen, and valve two are installed sequentially along the connecting pipeline from outlet one to air inlet. The CO2 concentration detector is installed on a branch between valve six and valve twelve. An vent valve is installed at the end of the branch away from the CO2 concentration detector.

[0012] Preferably, the second connecting component includes valve seven, valve eight, liquid pump two, valve nine, and valve ten. The connecting pipeline between valve four and valve five is connected to the liquid inlet through a regeneration pipeline. The regeneration pipeline is sequentially equipped with valve seven, valve eight, liquid pump two, valve nine, and valve ten along the direction gradually approaching the liquid inlet. The organic amine regeneration system is installed between valve seven and valve eight.

[0013] Preferably, the third connecting component includes valve 11, valve 13, air pump 3, valve 14, valve 15, valve 17, reboiler, and valve 18. The outlet 2 and the air inlet are connected by a reboiler pipeline. Valve 11, valve 13, air pump 3, valve 14, valve 15, valve 17, reboiler, and valve 18 are installed sequentially along the reboiler pipeline from outlet 2 to air inlet.

[0014] Preferably, the original air inlet is connected to valve sixteen and valve two on the connecting pipe via an air inlet pipe, wherein valve one is installed on the air inlet pipe, and the cold item inlet and outlet are connected to a guide pipe, on which valve three is installed.

[0015] Preferably, the condensate support device includes a bowl-shaped tower plate, a collecting plate, and multiple diverting plates. Multiple diverting plates with holes are provided in the lower tower body. A collecting plate is provided below the diverting plates. A hole is provided in the middle of the collecting plate. A bowl-shaped tower plate is provided below the collecting plate. A hole is provided near the top of the bowl-shaped tower plate.

[0016] Preferably, the lower tower body has a structure that gradually narrows and then gradually expands from top to bottom, the inner cylinder has a structure that is smaller at the top and larger at the bottom, the outer cylinder has a structure that is larger at the top and smaller at the bottom, the partition has an inverted funnel-shaped structure, and manholes are provided at the positions of the lower tower body corresponding to the bowl-shaped tower plate, the collecting plate and the multiple diversion plates.

[0017] Preferably, a method of using a segmented circulating tower, based on the segmented circulating tower described above, includes the following steps: S1: Cold material is introduced into the lower tower body through the cold material inlet and outlet. Raw gas is introduced into the lower tower body from the raw gas inlet. CO2 is condensed into dry ice and falls onto the condensate support device. Some of the gas that is not condensed enters the first connecting part and CO2 concentration is measured. When the CO2 concentration is lower than the threshold, the first connecting part discharges the gas. Otherwise, the gas is introduced into the gas inlet. S2: Discharge the cold material and extract the gas from the upper and lower tower bodies through the third connecting element. After heating, the gas enters the lower tower body through the inlet, sublimating the dry ice into CO2. The organic amine reserve solution is sent out from the organic amine regeneration system and injected into the upper tower body through the liquid inlet through the second connecting element. The organic amine flows down through the tray device to absorb CO2. The organic amine solution that has absorbed CO2 exits from the outlet and enters the organic amine regeneration system through the second connecting element. Some carbon products are discharged, and the regenerated organic amine continues to enter the upper tower body through the second connecting element and the liquid inlet for the next cycle.

[0018] Compared with related technologies, the segmented circulation tower and its usage method provided by the present invention have the following beneficial effects: 1. This application can be used to create a low-temperature environment and to complete the injection of organic amines and subsequent carbon adsorption, which is beneficial to the simplification of the process. The lower column is used to sublimate CO2 into dry ice. For this purpose, liquid nitrogen should be injected into the bottom of the lower column. By using the cold material, CO2 will sublimate first compared to other components. At this time, the upper column is not needed, so some air needs to be discharged through the outlet to ensure stable gas pressure inside the equipment. After a certain amount of dry ice is created, the air inlet is closed, and the low-temperature gas and liquid are discharged from the column. The second stage begins, where an organic amine solution is introduced from the liquid inlet of the upper column. At the same time, the dry ice is heated to sublimate and is adsorbed by the organic amine solution in the upper column and carried out of the column. This process is repeated to achieve good adsorption of CO2.

[0019] 2. The integrated tower equipment can save costs and simplify the process. It can also use the dry ice produced in the first stage as the high-concentration CO2 environment in the second stage. The main process is focused inside the tower, which further ensures energy concentration, compact structure and improved safety.

[0020] 3. Batch regeneration and organic amine solutions containing low concentrations of CO2 have stronger regeneration capabilities, higher regeneration efficiency, and longer service life, ensuring that costs are kept within a low range.

[0021] 4. The staggered process is highly competitive in terms of efficiency. While dry ice is being created inside the tower, the organic amines outside the tower are being regenerated. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the upper and lower tower bodies provided by the present invention; Figure 2 for Figure 1 A cross-sectional structural diagram of the structure shown. Figure 3 for Figure 2 The diagram shows the structure of the tray assembly. Figure 4 for Figure 3 A schematic diagram of the structure from another angle is shown; Figure 5 for Figure 3 A schematic diagram of the structure of the large bubble cap shown; Figure 6 for Figure 5 A schematic diagram of the structure from another angle is shown; Figure 7 for Figure 2 The diagram shows the structure of the sublimation support device. Figure 8 This is a schematic diagram of the process flow of the segmented circulation tower provided by the present invention.

[0023] The following are the labels in the diagram: 1. Upper tower body; 2. Lower tower body; 3. Liquid inlet; 4. Outlet 2; 5. Baffle; 6. Outlet 1; 7. Air inlet; 8. Cold material inlet / outlet; 9. Supporting tray; 10. Outer cylinder; 11. Top plate; 12. Inner cylinder; 13. Outer cover; 14. Insert rod; 15. Divider frame; 16. Divider hole; 17. Bowl-shaped tray; 18. Collection tray; 19. Diverter plate. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please refer to the following: Figures 1-8 ,in, Figure 1This is a schematic diagram of the upper and lower tower bodies provided by the present invention; Figure 2 for Figure 1 A cross-sectional structural diagram of the structure shown. Figure 3 for Figure 2 The diagram shows the structure of the tray assembly. Figure 4 for Figure 3 A schematic diagram of the structure from another angle is shown; Figure 5 for Figure 3 A schematic diagram of the structure of the large bubble cap shown; Figure 6 for Figure 5 A schematic diagram of the structure from another angle is shown; Figure 7 for Figure 2 The diagram shows the structure of the sublimation support device. Figure 8 This is a schematic diagram of the process flow of the segmented circulation tower provided by the present invention.

[0026] In the specific implementation process, such as Figures 1-8 As shown, the structure includes an upper column 1 and a lower column 2. The upper column 1 includes an upper section, a middle section, and a lower section. The upper section is provided with a liquid inlet 3 and an outlet 4. The middle section is provided with multiple tray devices. The lower section is provided with a baffle 5. The baffle 5 has a hole in the center that allows gas to pass through. The lower section has an outlet 6 on the outer wall corresponding to the baffle 5. The baffle 5 is used to receive the liquid entering from the liquid inlet 3 of the upper column 1, and then allow the liquid to flow out of the column from the outlet 6 next to the baffle 5. The lower column 2 has an air inlet 7 near the top. The lower column 2 is provided with a condensate support device. The lower column 2 has a cold material inlet and outlet 8 at the bottom. The partition 5 has a hole in the center that allows gas to pass through. The partition 5 has a funnel-shaped structure that gradually expands from top to bottom. The liquid moves down to the outlet 6 through the inclined surface of the partition 5, so that the partition 5 can simultaneously meet the needs of liquid outflow and gas overflow, and the liquid is not easy to flow down from the gas overflow hole. It also includes a first connecting member for connecting outlet 6 and inlet 7. The first connecting member is provided with an original gas inlet. When the CO2 concentration is below the threshold, the first connecting member discharges gas. Otherwise, the gas is introduced into inlet 7. The first connecting member is connected to a second connecting member. The second connecting member is connected to liquid inlet 3. The second connecting member is provided with an organic amine regeneration system. A third connecting member is connected between outlet 4 and inlet 7. The third connecting member is used to heat the gas and introduce it into inlet 7. In this application, a cryogenic separation tower with liquid nitrogen as the cooling source is added to the tower equipment. The cryogenic tower operates in both directions, so that the lower tower body 2 is mainly used in the first stage and the upper tower body 1 is mainly used in the second stage. The dry ice created in the first stage sublimates in the second stage to increase the carbon concentration in the circulating tower, thereby improving the absorption efficiency. As for the gas entering the circulating tower from the inlet 7 in the dual circulation tower, the gas is randomly distributed. Considering the selectivity of the gas direction, it can be determined by the set equipment parameters and the pressure in the tower. This application can be used to create a low-temperature environment and to complete the injection of organic amines and subsequent carbon adsorption, which is beneficial to the simplification of the process. The lower tower body 2 is used to sublimate CO2 into dry ice. For this purpose, liquid nitrogen should be injected into the bottom of the lower tower body 2 to achieve refrigeration. The liquid nitrogen makes CO2 sublimate first compared with other components. At this time, the upper tower body 1 is not used, so it needs to be discharged through outlet 6 to ensure the stable gas pressure inside the equipment. After a certain amount of dry ice is created, the inlet 7 is closed, and the low-temperature gas and liquid are discharged from the tower through outlet 6 and the cold material inlet and outlet 8. The equipment operation enters the second stage. The organic amine solution is introduced from the liquid inlet 3 of the upper tower body 1. At the same time, the gas from outlet 2 4 is drawn away by the air pump 3 through valve 11 and valve 13. Valves 14, 15 and 17 are opened to allow the gas to enter the reboiler. Valve 18 is opened, and the heated gas returns from the inlet 7 to make the dry ice sublimate and be adsorbed by the organic amine solution in the upper tower body 1. It is carried out of the tower through outlet 6. The whole process is circulated in this way to achieve good adsorption of CO2. The tray device includes a support tray 9, multiple large bubble caps and multiple small bubble caps. Multiple overflow holes are provided around the edge of the support tray 9. The multiple large bubble caps and multiple small bubble caps are all installed on the support tray 9. The small bubble cap includes an outer cylinder 10 and a top plate 11. The outer cylinder 10 is fixed to the through hole opened in the support tray 9. One end of the top plate 11 is hinged to the outer cylinder 10 and the top plate 11 covers the top of the outer cylinder 10. Although carbon dioxide is easily soluble in organic amine solution, when it comes into direct contact with organic amine solution, the contact area is small and the amount dissolved is small. In order to better separate carbon dioxide, multiple large bubble caps and multiple small bubble caps are set on the support tray 9 to stagger the gas in the longitudinal direction and increase the contact area between the gas and the liquid. After the bubbles enter the small bubble cap, the top plate 11 is gently pushed up and then disperses to the surroundings. At the same time, the height difference between the large and small bubble caps reduces gas collisions, thereby increasing the contact area between carbon dioxide and organic amine solution and effectively improving the mass exchange efficiency. Both the large and small bubble caps in this application are floating valve type bubble caps. The gas in the large bubble cap mainly flows out from the bottom of the support tray 9 and is further divided during the ascent, while the gas in the small bubble cap flows out from the middle of the support tray 9. The gas is less likely to accumulate, the division is more complete, and the carbon dioxide absorption is high. The large bubble cover includes an inner cylinder 12, an outer cover 13, and at least two insert rods 14. The inner cylinder 12 is fixed to the through hole in the support plate 9. The at least two insert rods 14 are fixed to the inner cylinder 12. The outer cover 13 is fitted onto the inner cylinder 12. The at least two insert rods 14 can move through the outer cover 13. The bottom end of the outer cover 13 is fixed with a ring-shaped dividing frame 15. The dividing frame 15 is provided with dividing holes 16. The cross-section of the dividing frame 15 is wavy. After the gas enters the large bubble cover, it pushes the outer cover 13 to move upward. The gas overflows from the top of the inner cylinder 12 to the gap between the inner cylinder 12 and the outer cover 13 and floats downward. After floating out, it moves downward along the inner wall of the dividing frame 15 and then upward, cutting the large bubble through the dividing holes 16. The first connecting component includes valve four, valve five, air pump one, valve six, valve twelve, valve sixteen, valve two, and a CO2 concentration detector. A connecting pipeline is provided between outlet one 6 and inlet 7. Valve four, valve five, air pump one, valve six, valve twelve, valve sixteen, and valve two are installed sequentially along the connecting pipeline from outlet one 6 to inlet 7. The CO2 concentration detector is installed on the branch between valve six and valve twelve. An vent valve is installed at the end of the branch away from the CO2 concentration detector. The second connecting component includes valve seven, valve eight, liquid pump two, valve nine and valve ten. The connecting pipeline between valve four and valve five is connected to the liquid inlet 3 through a regeneration pipeline. The regeneration pipeline is installed with valve seven, valve eight, liquid pump two, valve nine and valve ten in sequence along the direction that gradually approaches the liquid inlet 3. The organic amine regeneration system is installed between valve seven and valve eight. The third connecting component includes valve 11, valve 13, air pump 3, valve 14, valve 15, valve 17, reboiler and valve 18. The outlet 2 4 and the air inlet 7 are connected by a reboiler pipeline. Valve 11, valve 13, air pump 3, valve 14, valve 15, valve 17, reboiler and valve 18 are installed sequentially along the reboiler pipeline from outlet 2 4 to air inlet 7. The original air inlet is connected to valve sixteen and valve two on the connecting pipe through the air inlet pipe. Valve one is installed on the air inlet pipe. The cold item inlet / outlet 8 is connected to the guide pipe, and valve three is installed on the guide pipe. The condensate support device includes a bowl-shaped tower plate 17, a collecting plate 18, and multiple diverting plates 19. Multiple diverting plates 19 with holes are provided in the lower tower body 2. A collecting plate 18 is provided below the diverting plate 19. A hole is provided in the middle of the collecting plate 18. A bowl-shaped tower plate 17 is provided below the collecting plate 18. A hole is provided near the top of the bowl-shaped tower plate 17. The partition plate 5 has an inverted funnel-shaped structure. The holes on the diverting plates 19 are evenly distributed, so that the dry ice is distributed in a regular manner. After the gas enters through inlet 7, the carbon dioxide has a sublimation point of -78.5℃, while the freezing points of nitrogen, oxygen, argon, neon, helium, etc. are extremely low. Therefore, the carbon dioxide will be preferentially condensed at a distance from the bottom of the column. After descending, it will remain on the distribution plate 19 and gradually descend through the holes of the upper distribution plate 19, causing it to be dispersed on each layer of distribution plate 19. The holes of the collecting plate 18 converge in the center. The dry ice entering the bottom layer of the bowl-shaped column plate 17 will also be in the center of the bowl-shaped column plate 17. Other gases enter the liquid nitrogen area through the holes on the bowl-shaped column plate 17. After the solid in the bottom of the column reaches a certain amount (before contacting the bowl-shaped column plate 17), the second stage can be entered. The liquid nitrogen and other cold substances at the bottom of the column are discharged, and the gas at the top of the column enters the reboiler for heating. The hot gas returns from inlet 7, thereby sublimating the dry ice into carbon dioxide and creating a high-concentration environment. The lower tower body 2 has a structure that gradually narrows and then expands from top to bottom, adopting a wide-narrow-wide structural design. This structure constrains the heat flow field distributed around the liquid nitrogen at the bottom of the tower (the liquid nitrogen at the bottom of the tower is easily consumed quickly and a large amount of energy is wasted if the relevant structural design is not improved). This improves the efficiency of carbon dioxide liquefaction and solidification in the gas, and does not affect the normal use of the upper tower body 1 (liquid water is not easy to solidify). Therefore, with this tower section design, when the cold gas passes through the narrow part, the cold gas tends to be constrained towards the axis of the tower body. After passing through the narrow structure, when the cold gas diffuses again, it will also control its temperature to be lower at the axis of the tower body. As the temperature tends to be higher outward from the axis, the gas is largely constrained at the axis by the upper "inverted funnel-shaped" baffle 5. At this time, the temperature at the axis is lower, so carbon dioxide is easier to solidify, which can improve the efficiency of dry ice production. The inner cylinder 12 has a structure that is smaller at the top and larger at the bottom, while the outer cylinder 10 has a structure that is larger at the top and smaller at the bottom. Because the inner cylinder 12 has a structure that is smaller at the top and larger at the bottom, with a larger bottom radius than the top, the gas is more concentrated, increasing the thrust. On the other hand, the outer cylinder 10 has a structure that is larger at the top and smaller at the bottom, with a smaller bottom radius than the top, which reduces the thrust. In order to ensure that the large bubble cap and the small bubble cap work together, the outer cover 13 is made of lightweight material, and the number of small bubble caps is greater than the number of large bubble caps. Because there are more small bubble caps, it is necessary to control their instantaneous gas output. By setting up a baffle 5 with an inverted funnel-shaped structure, the organic amine solution flows to the side, making it less likely to accumulate and escape into the lower tower body 2 to solidify. Manholes are provided at the positions of the lower tower body 2 corresponding to the bowl-shaped tower plate 17, the collecting plate 18 and the multiple diversion plates 19. Through the manholes, relevant personnel can periodically remove the dry ice inside to prevent blockage. A method of using a segmented circulation tower, based on the above-mentioned segmented circulation tower, includes the following steps: S1: Open valve three to introduce liquid nitrogen into the cold material inlet / outlet 8. The raw gas passes through valve one and valve two into inlet 7. Since the temperature at inlet 7 is the sublimation point of carbon dioxide, most of the carbon dioxide turns into dry ice and falls to the sublimation support device in the lower column 2. The remaining gas that is not sublimated is the other gas. Some of the other gas will migrate towards the bottom of the column, and some will migrate towards the upper part of the column. To ensure the stable and normal pressure of the circulating column, open valves four and five to extract the gas from outlet 6. Open valve six and measure the CO2 concentration in real time at the CO2 concentration detector. If the concentration is low, the vent valve can be opened; otherwise, the gas will re-enter inlet 7 through valves sixteen and two to continue the previous operation. S2: After draining the liquid nitrogen from the bottom of the tower, the gas from outlet 24 passes through valves 11 and 13 and is drawn away by gas pump 3. Valves 14, 15, and 17 are opened, allowing the gas to enter the reboiler. Valve 18 is opened, and the heated gas returns from inlet 7, thus sublimating the dry ice into CO2 and creating a high-concentration CO2 environment. The organic amine reserve solution is sent from the organic amine regeneration system, passes through valve 8, enters liquid pump 2, passes through valves 9 and 10, and enters liquid inlet 3, allowing the organic amine to be injected into the upper tower body 1 from liquid inlet 3. The overflow from the overflow hole on the support tray 9 flows down and eventually exits from outlet 6. The high-concentration carbon dioxide passes through multiple large and small bubble caps during its upward movement, thus being more effectively adsorbed by the organic amine solution on the support tray 9. It then exits from outlet 6 along with the organic amine. The organic amine solution mixed with CO2 from outlet 6 passes through valves 4 and 7 and enters the organic amine regeneration system. Some carbon products are discharged, while the regenerated organic amine continues to pass through valve 8, enters liquid pump 2, and then passes through valves 9 and 10 to enter inlet 3.

[0027] The circuits and controls involved in this invention are all existing technologies and will not be described in detail here.

[0028] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A segmented circulating tower, characterized in that, The structure includes an upper tower body (1) and a lower tower body (2). The upper tower body (1) includes an upper section, a middle section and a lower section. The upper section is provided with a liquid inlet (3) and an outlet (4). The middle section is provided with multiple tray devices. The lower section is provided with a partition (5). The partition (5) has a hole in the center that allows gas to pass through. The lower section has an outlet (6) on the outer wall corresponding to the partition (5). The lower tower body (2) has an air inlet (7) near the top. The lower tower body (2) is provided with a condensate support device. The lower tower body (2) has a cold material inlet and outlet (8) at the bottom. It also includes a first connecting piece for connecting outlet one (6) and air inlet (7). The first connecting piece is provided with an original gas inlet. When the CO2 concentration is lower than the threshold, the first connecting piece discharges gas. Otherwise, the gas is introduced into the air inlet (7). The first connecting piece is connected to a second connecting piece. The second connecting piece is connected to the liquid inlet (3). The second connecting piece is provided with an organic amine regeneration system. A third connecting piece is connected between outlet two (4) and air inlet (7). The third connecting piece is used to heat the gas and introduce it into the air inlet (7).

2. The segmented circulation tower according to claim 1, characterized in that, The tray device includes a support tray (9), multiple large bubble caps and multiple small bubble caps. The support tray (9) has multiple overflow holes around its edge. The multiple large bubble caps and multiple small bubble caps are all installed on the support tray (9). The small bubble cap includes an outer cylinder (10) and a top plate (11). The outer cylinder (10) is fixed to a through hole in the support tray (9). One end of the top plate (11) is hinged to the outer cylinder (10) and the top plate (11) covers the top of the outer cylinder (10).

3. The segmented circulation tower according to claim 2, characterized in that, The large bubble cover includes an inner cylinder (12), an outer cover (13), and at least two insert rods (14). The inner cylinder (12) is fixed on the through hole opened in the support tower plate (9). At least two insert rods (14) are fixed on the inner cylinder (12). The outer cover (13) is sleeved on the inner cylinder (12). At least two insert rods (14) can move through the outer cover (13). The bottom end of the outer cover (13) is fixed with a ring-shaped dividing frame (15). The dividing frame (15) is provided with dividing holes (16). The cross section of the dividing frame (15) is wavy.

4. The segmented circulation tower according to claim 1, characterized in that, The first connecting component includes valve four, valve five, air pump one, valve six, valve twelve, valve sixteen, valve two, and a CO2 concentration detector. A connecting pipeline is provided between outlet one (6) and air inlet (7). Valve four, valve five, air pump one, valve six, valve twelve, valve sixteen, and valve two are installed sequentially along the connecting pipeline from outlet one (6) to air inlet (7). The CO2 concentration detector is installed on the branch between valve six and valve twelve. An vent valve is installed at the end of the branch away from the CO2 concentration detector.

5. The segmented circulation tower according to claim 4, characterized in that, The second connecting component includes valve seven, valve eight, liquid pump two, valve nine and valve ten. The connecting pipeline between valve four and valve five is connected to the liquid inlet (3) through a regeneration pipeline. The regeneration pipeline is installed with valve seven, valve eight, liquid pump two, valve nine and valve ten in sequence along the direction gradually approaching the liquid inlet (3). The organic amine regeneration system is installed between valve seven and valve eight.

6. The segmented circulation tower according to claim 1, characterized in that, The third connecting component includes valve 11, valve 13, air pump 3, valve 14, valve 15, valve 17, reboiler and valve 18. The outlet 2 (4) and the air inlet (7) are connected by a reboiler pipeline. Valve 11, valve 13, air pump 3, valve 14, valve 15, valve 17, reboiler and valve 18 are installed sequentially along the reboiler pipeline from outlet 2 (4) to air inlet (7).

7. The segmented circulation tower according to claim 4, characterized in that, The original air inlet is connected to valve sixteen and valve two on the connecting pipe through the air inlet pipe. Valve one is installed on the air inlet pipe. The cold item inlet and outlet (8) are connected to the guide pipe, and valve three is installed on the guide pipe.

8. The segmented circulation tower according to claim 3, characterized in that, The condensate support device includes a bowl-shaped tower plate (17), a collection plate (18), and multiple diversion plates (19). Multiple diversion plates (19) with holes are provided inside the lower tower body (2). A collection plate (18) is provided below the diversion plate (19). A hole is provided in the middle of the collection plate (18). A bowl-shaped tower plate (17) is provided below the collection plate (18). A hole is provided near the top of the bowl-shaped tower plate (17).

9. The segmented circulation tower according to claim 8, characterized in that, The lower tower body (2) has a structure that gradually narrows and then expands from top to bottom. The inner cylinder (12) has a structure that is smaller at the top and larger at the bottom. The outer cylinder (10) has a structure that is larger at the top and smaller at the bottom. The partition (5) has an inverted funnel-shaped structure. The lower tower body (2) is provided with manholes at the positions corresponding to the bowl-shaped tower plate (17), the collecting plate (18) and the multiple diversion plates (19).

10. A method of using a segmented circulation tower, based on the segmented circulation tower according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Cold material is introduced into the lower tower body (2) through the cold material inlet and outlet (8). The original gas is introduced into the lower tower body (2) from the original gas inlet. CO2 is condensed into dry ice and falls onto the condensate support device. Some of the gas that is not condensed enters the first connecting part and CO2 concentration is measured. When the CO2 concentration is lower than the threshold, the first connecting part discharges the gas. Otherwise, the gas is introduced into the gas inlet (7). S2: Discharge the cold material and extract the gas from the upper tower body (1) and lower tower body (2) through the third connecting part. After the gas is heated, it enters the lower tower body (2) through the gas inlet (7) to sublimate the dry ice into CO2. The organic amine storage solution is sent out from the organic amine regeneration system and the organic amine is injected into the upper tower body (1) through the liquid inlet (3) through the second connecting part. The organic amine flows down through the tower plate device to absorb CO2. The organic amine solution that has absorbed CO2 comes out from the outlet (6) and enters the organic amine regeneration system through the second connecting part. Some carbon products are discharged, and the regenerated organic amine continues to enter the upper tower body (1) through the second connecting part and the liquid inlet (3) for the next cycle.

Images