A carbon capture device and method of capturing carbon dioxide

Abstract

The present application relates to the field of carbon capture, and discloses a carbon capture device and a method for capturing carbon dioxide, the carbon capture device comprising at least one carbon capture device, the carbon capture device comprising a rotating shaft, a gas chamber and a rotating absorption cage arranged in the gas chamber, the rotating shaft extending through the gas chamber and the rotating absorption cage in the axial direction and capable of driving the rotating absorption cage to rotate; the surface of the rotating absorption cage is provided with a plurality of air inlet holes; the rotating shaft is a hollow structure, and the portion of the rotating shaft located in the rotating absorption cage is provided with a liquid film distributor cover plate, the liquid film distributor cover plate being capable of being lifted upward or tightened downward with the connecting position of the liquid film distributor cover plate and the rotating shaft as the fulcrum; in the rotating absorption cage, the exhaust hole is arranged above the connecting position of the rotating shaft, and the absorption liquid conveying hole is arranged below the connecting position of the rotating shaft. The carbon capture device can realize the absorption of low-concentration carbon dioxide gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of carbon dioxide capture, in particular to a carbon capture device and a method for capturing carbon dioxide. BACKGROUND

[0002] With the world's attention to the global greenhouse effect, reducing carbon dioxide emissions is increasingly valued and has become the most important measure for people to cope with global warming. At present, for high carbon emission intensity enterprises, it is crucial to effectively reduce the CO2 emission intensity in the production process. The main ways of carbon dioxide capture are pre-combustion carbon capture, combustion carbon capture and post-combustion carbon capture. Among them, post-combustion carbon capture technology is relatively mature, has the basis and conditions for large-scale application, and has a wide range of applicable scenarios and large technical demand, which has attracted widespread attention from domestic and foreign experts and scholars. Post-combustion carbon capture mainly uses amine organic substances such as ethanol amine (MEA) as the main component, and is used for flue gas CO2 capture after being prepared at a suitable concentration. This method is the only carbon capture method that has the conditions for producing million tons per year at present. However, this method has the disadvantages of high cost investment, complex system, and low economic efficiency of regeneration and desorption energy consumption. In addition, when the carbon dioxide concentration of the gas source is too low, the driving force of the absorption reaction is reduced due to the low gas phase partial pressure, and the whole carbon capture process cannot meet the high decarburization efficiency. At the same time, the viscosity of the absorbent increases with the increase of the concentration. On the one hand, high concentration of absorbent can increase the load of absorbent and effectively increase the absorption cycle efficiency of absorbent, thereby improving the economic efficiency of system operation. However, too high concentration of absorbent will cause plugging problem due to too high viscosity. At present, there is no high-efficiency capture method for low-concentration CO2, and the problem of high-concentration absorbent operation process has not been solved. SUMMARY

[0003] The purpose of the present application is to overcome the problems of low-concentration CO2 absorption efficiency and high-concentration absorbent operation process in the prior art, and to provide a carbon capture device and a method for capturing carbon dioxide. The carbon capture device can effectively realize the absorption of low-concentration carbon dioxide gas and the operation of high-concentration absorption liquid.

[0004] In order to achieve the above-mentioned purpose, the present application provides a carbon capture device, which comprises at least one carbon capture device, the carbon capture device comprises a rotating shaft, a gas chamber and a rotating absorption cage arranged in the gas chamber, the rotating shaft penetrates the gas chamber and the rotating absorption cage in the axial direction and can drive the rotating absorption cage to rotate;

[0005] A plurality of gas inlet holes are distributed on the surface of the rotating absorption cage, so that the carbon-containing gas to be captured conveyed into the gas chamber can enter the inner cavity of the rotating absorption cage through the gas inlet holes;

[0006] The rotating shaft is a hollow structure, and a liquid film distributor cover plate is arranged on the part of the rotating shaft located in the rotating absorption cage, the liquid film distributor cover plate can be lifted upward or tightened downward with the connecting part of the liquid film distributor cover plate and the rotating shaft as the fulcrum.

[0007] In the rotating absorption cage, an exhaust hole is arranged above the connecting part of the rotating shaft, and an absorption liquid delivery hole is arranged below the connecting part of the rotating shaft.

[0008] Preferably, the top of the rotating absorption cage is provided with an upper sealing plate, and a plurality of flow guide grooves are arranged on the inner wall.

[0009] Preferably, the liquid film distributor cover plate comprises a fixed ring and a plurality of liquid film distributor cover plate blades arranged around the fixed ring.

[0010] Preferably, a plurality of air permeable holes are arranged on the edge of the liquid film distributor cover plate blade in the radial direction.

[0011] Preferably, a limiting component is arranged on the inner wall of the rotating absorption cage.

[0012] When the rotating speed of the rotating shaft is greater than the rotating speed threshold value, the liquid film distributor cover plate is unfolded upward with the connecting part of the liquid film distributor cover plate and the rotating shaft as the fulcrum, and is locked at the limiting component.

[0013] When the rotating speed of the rotating shaft is less than the rotating speed threshold value, the liquid film distributor cover plate is tightened downward with the connecting part of the liquid film distributor cover plate and the rotating shaft as the fulcrum.

[0014] Preferably, the carbon capture device further comprises a rotating speed control module, which can collect absorption liquid concentration information and liquid level information in the rotating absorption cage, and adjust the rotating speed of the rotating shaft according to the absorption liquid concentration information and the liquid level information.

[0015] Preferably, the carbon capture device further comprises a rich liquid desorption unit, the rich liquid desorption unit comprises a rich liquid storage tank, a desorption device and a lean liquid storage tank, the lower end of the rotating shaft in the carbon capture device has a lower opening, the lower opening of the rotating shaft is in communication with the rich liquid storage tank and the lean liquid storage tank respectively, the rich liquid in the rotating absorption cage is discharged through the absorption liquid delivery hole and enters the rich liquid storage tank through the lower opening of the rotating shaft, the rich liquid collected in the rich liquid storage tank is then introduced into the desorption device for desorption, and the lean liquid obtained after desorption is transported to the lean liquid storage tank and then returned to the rotating absorption cage through the lower opening of the rotating shaft for repeated use.

[0016] Preferably, the carbon capture device comprises two or more carbon capture units, a first-stage booster is arranged on the gas inlet pipeline of the gas chamber of the first carbon capture unit in the order of processing of the carbon-containing gas to be captured, and the upper opening of the upper end of the rotating shaft in the former carbon capture unit is communicated with the gas inlet pipeline of the gas chamber of the latter carbon capture unit, and a second-stage booster is arranged on the gas inlet pipeline.

[0017] The second aspect of the present application provides a method for capturing carbon dioxide, which is implemented in the carbon capture device.

[0018] Preferably, when the rotating speed of the rotating shaft is greater than 90-110 r / min, the liquid film distributor cover plate is unfolded upward at the connecting position of the liquid film distributor cover plate and the rotating shaft as a fulcrum and is locked at the limiting component;

[0019] When the rotating speed of the rotating shaft is less than 950-1100 r / min, the liquid film distributor cover plate is tightened downward at the connecting position of the liquid film distributor cover plate and the rotating shaft as a fulcrum;

[0020] Preferably, when the concentration of the absorption liquid in the rotating absorption cage is greater than 0.9-1.05 g / mL, the rotating speed regulating module reduces the rotating speed of the rotating shaft.

[0021] In the carbon capture device, the carbon-containing gas to be captured enters the gas chamber and is then transported to the rotating absorption cage to contact with the absorbent, and the absorbed gas is discharged through the exhaust hole of the rotating shaft and is then transported to the next carbon capture unit for processing, so that the low-concentration carbon dioxide can be processed through multiple stages. In addition, in the rotating absorption cage, the absorbent is uniformly distributed on the surface of the cage structure wall, and the rotation of the rotating absorption cage further promotes the mixing and contact between the absorbent and the gas, thereby ensuring the efficient recovery of low-concentration carbon dioxide. Meanwhile, in the present application, when the rotating speed regulating module detects that the concentration of the absorption liquid is too high, the rotating speed of the rotating shaft can be reduced, and with the reduction of the rotating speed of the rotating shaft, the liquid film distributor cover plate is tightened downward to press the rich liquid in the rotating absorption cage to the center. When the liquid level rises, the rich liquid is discharged through the absorption liquid delivery hole of the rotating shaft and is then transported to the rich liquid desorption unit for processing. The lean liquid obtained after processing is returned to the capture unit for reuse, thereby realizing the process operation of high-concentration absorbent, successfully solving the problem of easy clogging of high-concentration absorbent, and realizing the absorption and processing of low-concentration carbon dioxide. Moreover, the carbon capture device can effectively improve the circulation load of the absorbent and effectively save equipment space, and has broad industrial application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1is a schematic diagram of the carbon capture device;

[0023] Figure 2 is a structural schematic diagram of the liquid film distributor cover plate;

[0024] Figure 3 is an axial sectional schematic diagram of the rotating absorption cage.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1 gas chamber; 2 rotating absorption cage;

[0027] 21 air inlet hole; 22 upper sealing plate;

[0028] 23 flow guide groove; 24 limiting component;

[0029] 3 rotating shaft; 31 air outlet hole;

[0030] 32 absorption liquid delivery hole; 33 upper opening;

[0031] 34 lower opening; 4 liquid film distributor cover plate;

[0032] 41 fixed ring; 42 liquid film distributor cover plate blade;

[0033] 5 rotating speed control module; 61 rich liquid storage tank;

[0034] 62 desorption device; 63 lean liquid storage tank;

[0035] 64 desorption pump; 65 rich liquid pump;

[0036] 66 lean liquid pump; 67 circulating pump;

[0037] 7 primary pressure boosting device; 8 secondary pressure boosting device;

[0038] 9 header. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0040] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The endpoints of the ranges and any values are understood to be approximate values. The exact values are understood to be within the range of values that one of ordinary skill in the art would consider equivalent to the stated values. The endpoints of the ranges of values and the values are understood to be approximate values and are included in the ranges. Individual values are included in the ranges.

[0041] CONJUNCTION WITH Figure 1The carbon capture device comprises at least one carbon capture device, the carbon capture device comprises a rotating shaft 3, a gas chamber 1 and a rotating absorption cage 2 arranged in the gas chamber 1. In the carbon capture device, the carbon-containing gas to be captured is first conveyed into the gas chamber 1 through the gas inlet pipeline of the gas chamber 1 and the gas inlet port arranged above the gas chamber 1, and then is conveyed into the rotating absorption cage 2 to be mixed with the absorbent for treatment, and the treated gas is discharged after entering the rotating shaft 3 through the exhaust hole 31 of the rotating shaft 3; or after entering the rotating shaft 3, the treated gas is conveyed into the gas chamber 1 of the carbon capture device connected to the rotating shaft 3 for further treatment.

[0042] In the present application, the rotating shaft 3 penetrates the gas chamber 1 and the rotating absorption cage 2 in the axial direction and can drive the rotating absorption cage 2 to rotate. The rapid rotation of the rotating absorption cage 2 during the carbon capture process helps to improve the capture efficiency of the absorbent in the rotating absorption cage 2 for the carbon-containing gas to be captured and improve the carbon dioxide absorption efficiency.

[0043] In the present application, the rotating shaft 3 is a hollow structure, and a liquid film distributor cover plate 4 is arranged on the part of the rotating shaft 3 located in the rotating absorption cage 2. That is, the liquid film distributor cover plate 4 is connected with the rotating shaft 3 and is arranged inside the rotating absorption cage 2. In particular, in the present application, the liquid film distributor cover plate 4 can be lifted upward or tightened downward with the connecting part of the liquid film distributor cover plate 4 and the rotating shaft 3 as the fulcrum.

[0044] In the present application, on the part of the rotating shaft 3 located in the rotating absorption cage 2, the exhaust hole 31 is arranged above the connecting part of the rotating shaft 3, and the absorption liquid conveying hole 32 is arranged below the connecting part. Specifically, the exhaust hole 31 is used to discharge the purified gas in the rotating absorption cage 2, and specifically, the treated gas enters the hollow part of the rotating shaft 3 through the exhaust hole 31 and is then discharged. The absorption liquid conveying hole 32 is used to output the rich liquid in the rotating absorption cage 2 or to input the regenerated lean liquid into the rotating absorption cage 2.

[0045] In a specific embodiment, the upper end of the rotating shaft 3 is provided with an upper opening 33, and the carbon-containing gas to be captured is discharged after being treated in the rotating absorption cage 2 through the exhaust hole 31 arranged on the upper end of the rotating shaft 3 and the upper opening 33 arranged on the upper end of the rotating shaft 3; the lower end of the rotating shaft 3 is provided with a lower opening 34, and the rich liquid in the rotating absorption cage 2 enters the hollow part of the rotating shaft 3 through the absorption liquid conveying hole 32 arranged on the rotating shaft 3 and is discharged through the lower opening 34 arranged on the lower end of the rotating shaft 3.

[0046] In the present application, the structure of the liquid film distributor cover plate 4 is shown in the following Figure 2 The liquid film distributor cover plate 4 comprises a fixed ring 41 and a plurality of liquid film distributor cover plate blades 42 arranged around the fixed ring 41. The fixed ring 41 is fixedly arranged at the connection between the liquid film distributor cover plate 4 and the rotating shaft 3 (i.e. the position of the fixed ring 41 coincides with the connection between the liquid film distributor cover plate 4 and the rotating shaft 3). Understandably, in a specific embodiment, the liquid film distributor cover plate blades 42 are upwardly unfolded or downwardly tightened with the connection between the liquid film distributor cover plate 4 and the rotating shaft 3 as the fulcrum; or understandably, in a specific embodiment, the liquid film distributor cover plate blades 42 are upwardly unfolded or downwardly tightened with the fixed ring 41 as the fulcrum.

[0047] Specifically, after the carbon-containing gas to be captured is delivered into the rotating absorption cage 2, the rotating shaft 3 is controlled to increase the rotating speed by the rotating speed control module 5. With the increase of the rotating speed, the liquid film distributor cover plate blades 42 in the liquid film distributor cover plate 4 are gradually unfolded upwardly with the fixed ring 41 as the fulcrum, so as to prevent the absorption liquid in the rotating absorption cage 2 from overflowing and further promote the uniform distribution of the absorption liquid. When the high-concentration absorbent in the rotating absorption cage 2 is saturated after a long time of circulation and capture, the rotating speed is controlled to decrease by the rotating speed control module 5. With the decrease of the rotating speed, the liquid film distributor cover plate blades 42 in the liquid film distributor cover plate 4 are gradually tightened downwardly with the fixed ring 41 as the fulcrum, so as to press the rich liquid in the rotating absorption cage 2 towards the center and promote the rich liquid to be discharged through the absorption liquid delivery hole 32 of the rotating shaft 3.

[0048] In a preferred embodiment, the edges of the liquid film distributor cover plate blades 42 are provided with a plurality of air permeable holes 43 in the radial direction. The treated gas first enters the upper part of the rotating absorption cage 2 through the air permeable holes 43 on the liquid film distributor cover plate blades 42, and then is discharged into the hollow part of the rotating shaft 3 through the exhaust hole 31 on the rotating shaft 3, and then is discharged to the next process or delivered to the next carbon capture device for further treatment.

[0049] In a specific embodiment, the exhaust hole 31 is located above the fixed ring 41, and the absorption liquid delivery hole 32 is located below the fixed ring 41. In a more specific embodiment, the exhaust hole 31 is located between the upper opening 33 at the upper end of the rotating shaft 3 and the fixed ring 41; and the absorption liquid delivery hole 32 is located between the lower opening 34 at the lower end of the rotating shaft 3 and the fixed ring 41.

[0050] In the present application, the axial cross-sectional view of the rotating absorption cage 2 is shown in the following Figure 3As shown, the surface of the rotating absorption cage 2 is provided with a plurality of air inlet holes 21, which enable the carbon-containing gas to be captured to be transported into the rotating absorption cage 2 through the air inlet holes 21 for processing, and the processed gas to be discharged through the air outlet holes 31 provided on the rotating shaft 3.

[0051] In a preferred embodiment, the inner wall of the rotating absorption cage 2 is provided with a plurality of flow guide grooves 23. The flow guide grooves 23 help the absorbent in the rotating absorption cage 2 to be more evenly distributed, thereby further improving the capture efficiency of the carbon capture device and the capture efficiency of low-concentration carbon dioxide.

[0052] In the present application, the rotating absorption cage 2 is also provided with an upper sealing plate 22 for blocking the overflow of the absorbent during the capture process, thereby ensuring the normal operation of the capture process.

[0053] In a preferred embodiment, in order to ensure the smooth operation of the carbon capture device, the air outlet holes 31 provided on the rotating shaft 3 are located between the connection (i.e. the connection between the liquid film distributor cover plate 4 and the rotating shaft 3 or the fixing ring 41 of the liquid film distributor cover plate 4) and the upper sealing plate 22.

[0054] In a specific embodiment, the absorbent delivery holes 32 are located between the connection (i.e. the connection between the liquid film distributor cover plate 4 and the rotating shaft 3 or the fixing ring 41 of the liquid film distributor cover plate 4) and the bottom of the rotating absorption cage 2.

[0055] In a preferred embodiment, in order to further ensure the normal operation of the carbon capture device, the inner wall of the rotating absorption cage 2 is provided with a limiting component 24. Specifically, when the rotating speed of the rotating shaft 3 is greater than a rotating speed threshold, the liquid film distributor cover plate blades 42 of the liquid film distributor cover plate 4 are lifted and unfolded upwards with the connection between the liquid film distributor cover plate 4 and the rotating shaft 3 as the fulcrum (i.e. the liquid film distributor cover plate blades 42 of the liquid film distributor cover plate 4 are lifted and unfolded upwards with the fixing ring 41 as the fulcrum), and are locked at the limiting component 24; when the rotating speed of the rotating shaft 3 is less than the rotating speed threshold, the liquid film distributor cover plate blades 42 of the liquid film distributor cover plate 4 are tightened and gathered downwards with the connection between the liquid film distributor cover plate 4 and the rotating shaft 3 as the fulcrum (i.e. the liquid film distributor cover plate blades 42 of the liquid film distributor cover plate 4 are tightened and gathered downwards with the fixing ring 41 as the fulcrum). Specifically, when the liquid film distributor cover plate 4 reaches the limiting component 24 and is locked, the liquid level of the absorbent in the rotating absorption cage 2 stops increasing at the liquid film distributor cover plate 4.

[0056] In a specific embodiment, the limiting component 24 can be a device commonly used in the art, such as a stopper.

[0057] In the present application, the carbon capture device further comprises a rotating speed control module 5, which is capable of collecting the absorption liquid concentration information and liquid level information in the rotating absorption cage 2, and adjusting the rotating speed of the rotating shaft 3 according to the absorption liquid concentration information and the liquid level information. Specifically, when the carbon-containing gas to be captured is delivered into the rotating absorption cage 2, the rotating speed control module 5 increases the rotating speed of the rotating shaft 3, the rotating shaft 3 drives the rotating absorption cage 2 to rotate, and the rotating speed of the rotating absorption cage 2 is accelerated; when the carbon capture device runs for a period of time, the absorption liquid in the rotating absorption cage 2 reaches adsorption saturation, the rotating speed control module 5 reduces the rotating speed of the rotating shaft 3 according to the collected absorption liquid concentration information, so that the liquid film distributor cover plate blades 42 are tightened and gathered downward, and the rich liquid in the rotating absorption cage 2 is discharged through the absorption liquid delivery holes 32 provided on the rotating shaft 3 and delivered to the rich liquid storage tank 61 in the rich liquid desorption unit.

[0058] In a specific embodiment, the rotating speed control module 5 is arranged on the part of the rotating shaft 3 located in the gas chamber 1.

[0059] In a specific embodiment, in order to improve the carbon dioxide capture efficiency and improve the absorption efficiency of low-concentration carbon dioxide, the carbon capture device of the present application comprises at least two or more carbon capture devices, and further according to the processing order of the carbon-containing gas to be captured, a first (or first) carbon capture device is provided with a primary pressure boosting device 7 on the gas inlet pipeline of the gas chamber 1, the outlet of the primary pressure boosting device 7 is connected with the inlet of the gas chamber of the first carbon capture device, and the primary pressure boosting device 7 is used to deliver the carbon-containing gas to be captured into the gas chamber 1 of the first carbon capture device. Specifically, the primary pressure boosting device 7 can be a device commonly used in the art which can increase the pressure of the gas.

[0060] In a specific embodiment, along the flow direction of the carbon-containing gas to be captured, a primary pressure boosting device 7 and a header 9 are arranged in sequence on the gas inlet pipeline of the gas chamber 1 of the first (or first) carbon capture device, the header 9 is used to stabilize the pressure of the pressurized gas, and can also serve as a sealed air extraction point to pressurize and seal the connection between the rotating shaft 3 and the gas chamber 1.

[0061] Further specifically, between two adjacent carbon capture devices, the upper opening of the upper end of the rotating shaft (3) in the former carbon capture device is in communication with the gas inlet pipeline of the gas chamber 1 of the latter carbon capture device, and a secondary pressurizing device 8 is arranged on the gas inlet pipeline. For example, when the carbon capture device in the present application comprises two carbon capture devices, after the carbon-containing gas to be captured is absorbed in the rotating absorption cage 2 of the first carbon capture device, it enters the hollow part inside the rotating shaft 3 through the exhaust hole 31 of the rotating shaft 3, and is discharged through the upper opening 33 of the upper end of the rotating shaft 3, and then is transported to the gas chamber 1 of the second carbon capture device through the arranged secondary pressurizing device 8 for further treatment, so as to realize multi-stage adsorption and multi-stage treatment of carbon dioxide and improve the effect of carbon capture.

[0062] In a preferred embodiment, the carbon capture device in the present application further comprises a rich liquid desorption unit, which comprises a rich liquid storage tank 61, a desorption device 62 and a lean liquid storage tank 63.

[0063] Specifically, the lower opening 34 of the lower end of the rotating shaft 3 in the carbon capture device is in communication with the inlet of the rich liquid storage tank 61 and the outlet of the lean liquid storage tank 63, respectively, the outlet of the rich liquid storage tank 61 is connected with the inlet of the desorption device 62, and the outlet of the desorption device 62 is connected with the inlet of the lean liquid storage tank 63.

[0064] Specifically, a first valve is arranged at the lower opening 34 of the lower end of the rotating shaft 3, a second valve is arranged between the lower opening 34 of the lower end of the rotating shaft 3 and the inlet of the rich liquid storage tank 61, and a third valve is arranged between the lower opening 34 of the lower end of the rotating shaft 3 and the outlet of the lean liquid storage tank 63.

[0065] In a specific embodiment, the rich liquid in the rotating absorption cage 2 is discharged through the absorption liquid conveying hole 32 on the rotating shaft 3 and enters the rich liquid storage tank 61 through the lower opening 34 of the rotating shaft 3, the rich liquid collected in the rich liquid storage tank 61 is then desorbed and regenerated in the desorption device 62, the lean liquid obtained after desorption is transported to the lean liquid storage tank 63, and then enters the hollow part of the rotating shaft 3 through the lower opening 34 of the rotating shaft 3 and returns to the rotating absorption cage 2 through the absorption liquid conveying hole 32 on the rotating shaft 3 for repeated use.

[0066] In a preferred embodiment, a desorption pump 64 is arranged between the rich liquid storage tank 61 and the desorption device 62, for transporting the rich liquid from the rich liquid storage tank 61 to the desorption device 62 for desorption and regeneration. In the present application, the desorption device 62 can be a device commonly used in the art for desorption and regeneration of rich liquid, for example, it can be a desorption tower.

[0067] In a preferred embodiment, the rich liquid obtained in the carbon capture device can be transported to the rich liquid storage tank 61 for storage by using a rich liquid pump 65, which can be a pump commonly used in the art for transporting liquid.

[0068] In a preferred embodiment, a lean liquid pump 66 is provided at the outlet of the lean liquid storage tank 63 for transporting the lean liquid to the rotating shaft 3 and then back to the rotating absorption cage 2 for reuse.

[0069] In a preferred embodiment, a circulation pump 67 is provided between the desorption device and the lean liquid storage tank for transporting the absorption liquid (i.e. lean liquid) obtained after desorption to the lean liquid storage tank.

[0070] In a specific embodiment, the high-purity carbon dioxide obtained after desorption in the desorption device 62 can be transported to a drying tower for drying, then liquefied to obtain liquid carbon dioxide product for use or sale.

[0071] In a specific embodiment, when the carbon capture device of the present application comprises two carbon capture devices, the process flow diagram is as shown in Figure 1 The working principle of the carbon capture device is as follows:

[0072] The carbon-containing gas to be captured is pressurized by a primary pressurizing device 7, then transported to the header 9 for stabilization, and then enters the gas chamber 1 of the first carbon capture device through the gas inlet of the gas chamber 1, and then enters the inner cavity of the rotating absorption cage 2 through the gas inlet hole 21 of the rotating absorption cage 2;

[0073] The third valve between the lower opening 34 of the rotating shaft 3 in the second carbon capture device and the outlet of the lean liquid storage tank 63 is closed, and the third valve between the lower opening of the rotating shaft 3 in the first carbon capture device and the outlet of the lean liquid storage tank 63 is opened. After the gas pressure in the rotating absorption cage 2 is established, the lean liquid from the lean liquid storage tank 63 is transported into the hollow portion of the rotating shaft 3 through the lower opening 34 of the rotating shaft 3 in the first carbon capture device by using the lean liquid pump 66, and then transported into the rotating absorption cage 2 through the absorption liquid conveying hole 32 on the rotating shaft 3. The input absorption liquid gradually distributes upward along the inner wall of the rotating absorption cage 2 along the guide groove 23. At this time, the rotating speed control module 5 gradually increases the rotating speed of the rotating shaft 3, the liquid film distributor cover plate blades 42 of the liquid film distributor cover plate 4 are lifted and unfolded upward with the fixed ring 41 as the fulcrum, and are locked at the limiting part 24. The liquid surface of the absorption liquid in the rotating absorption cage 2 completely covers the gas inlet hole 21 along the guide groove 23, and stops increasing when it contacts the liquid film distributor cover plate 4. The absorption liquid in the rotating absorption cage 2 stably absorbs the carbon-containing gas to be captured;

[0074] The gas after absorption in the first carbon capture device enters into the upper part of the rotating absorption cage 2 through the air-permeable holes on the liquid film distributor cover plate leaf 42, then enters into the hollow part of the rotating shaft 3 through the exhaust holes 31 of the rotating shaft 3, and is transported to the secondary pressurizing device 8 through the upper opening 33 at the upper end of the rotating shaft 3 for pressurization, and then is transported to the gas chamber 1 of the second carbon capture device, and then enters into the inner cavity of the rotating absorption cage 2 in the second carbon capture device through the gas inlet holes 21, at this time, the third valve between the lower opening 34 of the rotating shaft 3 in the second carbon capture device and the outlet of the lean liquid storage tank 63 is opened, and the third valve between the lower opening of the rotating shaft 3 in the first carbon capture device and the outlet of the lean liquid storage tank 63 is closed, the lean liquid in the lean liquid storage tank 63 enters into the hollow part of the rotating shaft 3 through the lower opening 34 of the rotating shaft 3 in the second carbon capture device, and then is transported to the inner cavity of the rotating absorption cage 2 in the second carbon capture device through the absorption liquid transporting holes 32 on the rotating shaft 3, and is mixed with the purified gas from the first carbon capture device to absorb the remaining carbon dioxide in the gas, and the purified gas after absorption enters into the upper part of the rotating absorption cage 2 through the air-permeable holes on the liquid film distributor cover plate leaf 42 in the second carbon capture device, then enters into the hollow part of the rotating shaft 3 through the exhaust holes 31 of the rotating shaft 3, and is directly discharged to the atmosphere through the upper opening 33 at the upper end of the rotating shaft 3.

[0075] When the absorption liquid in the carbon capture device reaches the absorption saturation, the rotating speed of the rotating shaft 3 is reduced by the rotating speed control module 5 in the rotating absorption cage 2 through the collected absorption liquid concentration information, so that the liquid film distributor cover plate leaf 42 is gathered downward with the fixed ring 41 as the fulcrum, the rich liquid in the rotating absorption cage 2 enters into the hollow part of the rotating shaft 3 through the absorption liquid transporting holes 32 arranged on the rotating shaft 3, and is discharged through the lower opening 34, the discharged rich liquid is transported to the rich liquid storage tank 61 in the rich liquid desorption unit through the rich liquid pump 65, then is transported to the desorption device 62 through the desorption pump 64 for desorption, and the lean liquid obtained after desorption is returned to the lean liquid storage tank 63 through the circulating pump 67, and then is transported to the rotating absorption cage 2 through the lean liquid pump 66.

[0076] The application further provides a method for capturing carbon dioxide, which is implemented in the carbon capture device.

[0077] In a preferred embodiment, when the rotating shaft 3 has a rotating speed greater than 90-110 r / min, the liquid film distributor cover plate blades 42 of the liquid film distributor cover plate 4 are lifted and unfolded upwards with the connecting part of the liquid film distributor cover plate 4 and the rotating shaft 3 as a fulcrum and are locked at the limiting part 24; when the rotating shaft 3 has a rotating speed less than 950-1100 r / min, the liquid film distributor cover plate blades 42 of the liquid film distributor cover plate 4 are tightened downwards with the connecting part of the liquid film distributor cover plate 4 and the rotating shaft 3 as a fulcrum.

[0078] In a specific embodiment, when the concentration of the absorption liquid in the rotating absorption cage 2 is greater than 0.9-1.05 g / mL, the rotating speed control module 5 will reduce the rotating speed of the rotating shaft 3, at this time, the rotating speed of the liquid film distributor cover plate blades 42 is slowly reduced and gradually tightened downwards, so that the absorption liquid in the rotating absorption cage 2 enters the hollow part of the rotating shaft 3 through the absorption liquid conveying holes 32 on the rotating shaft 3, then is discharged through the lower opening of the rotating shaft 3 and enters the rich liquid storage tank 61, and then is conveyed to the desorption device 62 for treatment.

[0079] The carbon capture device can realize efficient capture of low-concentration carbon dioxide, can realize operation of high-concentration absorbent, can improve the circulation efficiency of the carbon capture system, solves the problem of capture of low-concentration carbon dioxide, solves the problem of process operation of high-concentration absorption liquid, and has wide industrial application prospects.

[0080] The application will be described in detail below through examples, but the protection scope of the application is not limited thereto.

[0081] Example 1

[0082] The carbon capture device shown in Figure 1 is used for treatment, wherein the carbon capture device contains a rich liquid desorption unit and two carbon capture devices;

[0083] The carbon capture device includes a rotating shaft 3, a gas chamber 1 and a rotating absorption cage 2 arranged in the gas chamber 1;

[0084] The rotating shaft 3 penetrates the gas chamber 1 and the rotating absorption cage 2 in the axial direction and can drive the rotating absorption cage 2 to rotate; the rotating shaft 3 is a hollow structure and is provided with a liquid film distributor cover plate 4 on the part of the rotating shaft 3 located in the rotating absorption cage 2;

[0085] The structure of the liquid film distributor cover plate 4 is as shown in Figure 2As shown, the liquid film distributor cover plate 4 comprises a fixed ring 41 and a plurality of liquid film distributor cover plate blades 42 arranged around the fixed ring 41; the edges of the liquid film distributor cover plate blades 42 are provided with a plurality of air permeable holes 43 in the radial direction; the liquid film distributor cover plate 4 can be lifted upwards or tightened downwards with the fixed ring 41 as the fulcrum;

[0086] The upper end of the rotating shaft 3 is provided with an upper opening 33, and the lower end of the rotating shaft 3 is provided with a lower opening 34;

[0087] The rotating shaft 3 is provided with an exhaust hole 31 between the upper opening 33 and the fixed ring 41, and is provided with an absorption liquid delivery hole 32 between the lower opening 34 and the fixed ring 41;

[0088] The schematic diagram of the rotating absorption cage 2 is as shown in Figure 3 As shown, the surface of the rotating absorption cage 2 is provided with a plurality of air inlet holes 21, the inner wall is provided with a plurality of flow guide grooves 23, and the upper end is provided with an upper sealing plate 22;

[0089] The inner wall of the rotating absorption cage 2 is provided with a limiting component 24;

[0090] The rotating speed control module 5 is arranged on the part of the rotating shaft 3 located in the air chamber 1;

[0091] The rich liquid desorption unit comprises a rich liquid storage tank 61, a desorption device 62, and a lean liquid storage tank 63;

[0092] The lower opening 34 of the lower end of the rotating shaft 3 in the carbon capture device is in communication with the inlet of the rich liquid storage tank 61 and the outlet of the lean liquid storage tank 63, respectively; the outlet of the rich liquid storage tank 61 is connected with the inlet of the desorption device 62; the outlet of the desorption device 62 is connected with the inlet of the lean liquid storage tank 63;

[0093] A desorption pump 64 is arranged between the rich liquid storage tank 61 and the desorption device 62;

[0094] A rich liquid pump 65 is arranged between the lower opening 34 of the lower end of the rotating shaft 3 and the inlet of the rich liquid storage tank 61 in the carbon capture device;

[0095] A lean liquid pump 66 is arranged at the outlet of the lean liquid storage tank 63;

[0096] A circulation pump 67 is arranged between the desorption device and the lean liquid storage tank;

[0097] A first valve is arranged at the lower opening 34 of the lower end of the rotating shaft 3; a second valve is arranged between the lower opening 34 of the lower end of the rotating shaft 3 and the inlet of the rich liquid storage tank 61; and a third valve is arranged between the lower opening 34 of the lower end of the rotating shaft 3 and the outlet of the lean liquid storage tank 63.

[0098] The specific operation process of the device is as follows:

[0099] The carbon-containing gas to be captured (the content of carbon dioxide is 12%) is pressurized by the primary booster 7, then transported to the header 9 for stabilization, and then enters the gas chamber of the first carbon capture device through the gas inlet of the gas chamber 1, and then enters the inner cavity of the rotating absorption cage 2 through the gas inlet hole 21 of the rotating absorption cage 2;

[0100] The third valve between the lower opening 34 of the rotating shaft 3 in the second carbon capture device and the outlet of the lean liquid tank 63 is closed, and the third valve between the lower opening of the rotating shaft 3 in the first carbon capture device and the outlet of the lean liquid tank 63 is opened. After the air pressure in the rotating absorption cage 2 is established, the lean liquid from the lean liquid tank 63 enters the hollow part of the rotating shaft 3 through the lower opening 34 of the rotating shaft 3 in the first carbon capture device, and then enters the rotating absorption cage 2 through the absorption liquid conveying hole 32 on the rotating shaft 3. The input absorption liquid gradually distributes upward along the inner wall of the rotating absorption cage 2 along the flow guide groove 23; At this time, the rotating speed control module 5 gradually increases the rotating speed of the rotating shaft 3 to 100 r / min, the liquid film distributor cover plate blade 42 of the liquid film distributor cover plate 4 is lifted and unfolded upward with the fixed ring 41 as the fulcrum, and is locked at the limiting part 24 (at this time, the rotating speed of the rotating shaft 3 is 1200 r / min). The liquid surface of the absorption liquid in the rotating absorption cage 2 completely covers the gas inlet hole 21 along the flow guide groove 23, and stops increasing when it contacts the liquid film distributor cover plate 4. The absorption liquid in the rotating absorption cage 2 stably absorbs and processes the carbon-containing gas to be captured;

[0101] The gas after absorption in the first carbon capture device enters the upper part of the rotating absorption cage 2 through the air holes on the liquid film distributor cover plate blade 42 of the rotating shaft 3, then enters the hollow part of the rotating shaft 3 through the exhaust hole 31 of the rotating shaft 3, and is transported to the secondary pressurizing device 8 through the upper opening 33 at the upper end of the rotating shaft 3 for pressurization, and then is transported to the gas chamber 1 of the second carbon capture device, and then enters the inner cavity of the rotating absorption cage 2 in the second carbon capture device through the air inlet hole 21, at this time, the third valve between the lower opening 34 of the rotating shaft 3 in the second carbon capture device and the outlet of the lean liquid storage tank 63 is opened, and the third valve between the lower opening of the rotating shaft 3 in the first carbon capture device and the outlet of the lean liquid storage tank 63 is closed, the lean liquid in the lean liquid storage tank 63 enters the hollow part of the rotating shaft 3 through the lower opening 34 of the rotating shaft 3 in the second carbon capture device, and then is transported to the inner cavity of the rotating absorption cage 2 in the second carbon capture device through the absorption liquid conveying hole 32 on the rotating shaft 3, and is mixed and contacted with the purified gas from the first carbon capture device, so that the remaining carbon dioxide in the gas is absorbed, and the purified gas is transported to the gas chamber 1 of the second carbon capture device through the air holes on the liquid film distributor cover plate blade 42 of the rotating absorption cage 2, then enters the upper part of the rotating absorption cage 2 through the exhaust hole 31 of the rotating shaft 3, and is directly discharged to the atmosphere through the upper opening 33 at the upper end of the rotating shaft 3 (the carbon dioxide content in the purified gas is 1.2%);

[0102] When the absorption liquid in the carbon capture device reaches the adsorption saturation (the concentration of the absorption liquid is 1.018 g / mL), the rotating speed regulating module 5 in the rotating absorption cage 2 reduces the rotating speed of the rotating shaft 3 to 1000 r / min through the collected absorption liquid concentration information, so that the liquid film distributor cover plate blade 42 is gathered and tightened downward around the fixed ring 41 as a fulcrum, the rich liquid in the rotating absorption cage 2 is discharged into the hollow part of the rotating shaft 3 through the absorption liquid conveying hole 32 arranged on the rotating shaft 3, then is discharged through the lower opening 34 of the rotating shaft 3, and is transported to the rich liquid storage tank 61 in the rich liquid desorption unit through the rich liquid pump 65, then is transported to the desorption device 62 through the desorption pump 64 for desorption, and the lean liquid obtained after desorption is returned to the lean liquid storage tank 63 through the circulating pump 67, and then is transported to the rotating absorption cage 2 through the lean liquid pump 66.

[0103] Through calculation, it can be known that the carbon capture efficiency of the carbon capture device is 90%, the carbon capture device can realize efficient recovery and capture of low-concentration carbon dioxide, can solve the problems of operation of high-concentration absorption liquid, and can further save equipment space.

[0104] The preferred embodiments of the present application are described in detail above, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including that each technical feature is combined in any other suitable manner. These simple modifications and combinations should also be considered as disclosed by the present application and fall within the protection scope of the present application.

Claims

1. A carbon capture device, characterized in that, The carbon capture device includes at least one carbon capture unit, which includes a rotating shaft (3), a gas chamber (1), and a rotating absorption cage (2) disposed in the gas chamber (1). The rotating shaft (3) passes through the gas chamber (1) and the rotating absorption cage (2) in the axial direction and can drive the rotating absorption cage (2) to rotate. The surface of the rotating absorption cage (2) is provided with a number of air inlets (21), which allow the carbon-containing gas to be captured delivered to the gas chamber (1) to enter the inner cavity of the rotating absorption cage (2) through the air inlets (21). The rotating shaft (3) has a hollow structure, and a liquid film distributor cover plate (4) is provided on the part of the rotating shaft (3) located inside the rotating absorption cage (2). The liquid film distributor cover plate (4) can be lifted upward or tightened downward with the connection between the liquid film distributor cover plate (4) and the rotating shaft (3) as the fulcrum. The liquid film distributor cover plate (4) includes a fixing ring (41) and a plurality of liquid film distributor cover plate blades (42) arranged around the fixing ring (41). Inside the rotating absorption cage (2), the rotating shaft (3) is provided with an exhaust hole (31) above the connection, and the rotating shaft (3) is provided with an absorbent delivery hole (32) below the connection. The inner wall of the rotating absorption cage (2) is provided with a limiting component (24); when the rotation speed of the rotating shaft (3) is greater than the rotation speed threshold, the liquid film distributor cover plate blade (42) is lifted and unfolded upward with the connection between the liquid film distributor cover plate (4) and the rotating shaft (3) as the fulcrum, and locked at the limiting component (24); when the rotation speed of the rotating shaft (3) is less than the rotation speed threshold, the liquid film distributor cover plate blade (42) is tightened downward with the connection between the liquid film distributor cover plate (4) and the rotating shaft (3) as the fulcrum.

2. The carbon capture device according to claim 1, characterized in that, The top of the rotating absorption cage (2) is provided with an upper sealing plate (22), and the inner wall is provided with several guide grooves (23).

3. The carbon capture device according to claim 1, characterized in that, The edge of the cover plate blade (42) of the liquid film distributor is provided with a number of vent holes (43) along the radial direction.

4. The carbon capture device according to any one of claims 1-3, characterized in that, The carbon trap also includes a speed control module (5), which can collect the concentration information and level information of the absorbent in the rotating absorption cage (2) and adjust the speed of the rotating shaft (3) according to the concentration information and level information of the absorbent.

5. The carbon capture device according to any one of claims 1-3, characterized in that, The carbon capture device further includes a rich liquid desorption unit, which includes a rich liquid storage tank (61), a desorption device (62), and a lean liquid storage tank (63). The lower end of the rotating shaft (3) in the carbon capture device has a lower opening (34). The lower opening (34) of the rotating shaft (3) is connected to the rich liquid storage tank and the lean liquid storage tank respectively. The rich liquid in the rotating absorption cage (2) is discharged through the absorbent delivery hole (32) and enters the rich liquid storage tank (61) through the lower opening (34) of the rotating shaft (3). The rich liquid collected in the rich liquid storage tank (61) then enters the desorption device (62) for desorption. The lean liquid obtained after desorption is then transported to the lean liquid storage tank (63) and then returned to the rotating absorption cage (2) through the lower opening (34) of the rotating shaft (3) for reuse.

6. The carbon capture device according to any one of claims 1-3, characterized in that, The carbon capture device includes two or more carbon capturers. According to the processing order of the carbon-containing gas to be captured, a first-stage booster device (7) is provided on the air inlet pipeline of the gas chamber (1) of the first carbon capturer. Between two adjacent carbon capturers, the upper opening of the upper end of the rotating shaft (3) in the first carbon capturer is connected to the air inlet pipeline of the gas chamber (1) of the second carbon capturer, and a second-stage booster device (8) is provided on the air inlet pipeline.

7. A method for capturing carbon dioxide, characterized in that, The method is carried out in the carbon capture apparatus according to any one of claims 1-6.

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