A CO2 capture device for flue gas from a coal-fired power plant

Abstract

This invention discloses a method for CO2 removal from flue gas of coal-fired power plants, relating to the field of flue gas treatment technology. The invention includes a collection chamber, with an inlet chamber and an outlet chamber sealed at both ends by flanges. Three equidistantly distributed splicing modules are located at the top of the collection chamber, each equipped with a collection module. Three equally distributed limiting modules, working in conjunction with the splicing modules, are also located at the top of the collection chamber. A drive module is located at the bottom of the collection chamber. Each splicing module includes a base plate, with two symmetrically distributed fixing brackets fixedly mounted at the top of the base plate. By setting up the collection module and drive module, the absorbent circulates within the inclined polypropylene hollow fiber membrane inside the collection module. Simultaneously, the drive module, through a low-speed permanent magnet synchronous motor, a rotating shaft, and splines, drives the entire collection module to rotate slowly. The combined effect of these two mechanisms effectively tears the gas boundary layer on the membrane fiber surface, significantly improving the CO2 collection efficiency.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment equipment technology, specifically to a CO2 capture device for flue gas from coal-fired power plants. Background Technology

[0002] Flue gas treatment equipment is specialized equipment used to purify, remove pollutants from, and recycle resources from flue gas generated during industrial production processes. Among flue gas treatment equipment, membrane capture devices are currently the most commonly used technology for CO2 capture and removal due to their simple structure and high absorption efficiency. However, existing membrane fibers mostly adopt a static fixed structure, which easily forms a dead zone around the flow of flue gas on the surface of the membrane fibers. The gas phase boundary layer is thick and difficult to break effectively, resulting in low utilization of the effective mass transfer area of ​​the membrane fibers, low CO2 absorption efficiency, and unsatisfactory capture effect. Secondly, most membrane capture devices are fixed integrated structures, and the membrane fiber components cannot be independently and quickly disassembled and assembled. When maintenance or replacement is required, the entire machine must be shut down for disassembly, which is cumbersome and time-consuming, seriously affecting the continuous and stable operation of the power plant. In order to solve the above problems, the inventors propose a CO2 capture device in flue gas of coal-fired power plants. Summary of the Invention

[0003] To address the issues of improving CO2 capture efficiency and enabling rapid disassembly and maintenance of the capture device, the present invention aims to provide a CO2 capture device for flue gas from coal-fired power plants.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a CO capture device in flue gas of a coal-fired power plant, comprising a capture chamber, wherein the two ends of the capture chamber are respectively sealed with a flue gas inlet chamber and a flue gas outlet chamber through flanges, the top of the capture chamber is provided with three equidistantly distributed splicing assembly modules, each splicing assembly module is provided with a capture module, the top of the capture chamber is provided with three equidistantly distributed limiting modules that cooperate with the splicing assembly modules, and the bottom of the capture chamber is provided with a drive module.

[0005] Preferably, the splicing assembly module includes a substrate, two symmetrically distributed fixing frames are fixedly installed on the top of the substrate, two symmetrically distributed supports are provided above the fixing frames, limit grooves are opened at the four corners of the substrate, limit bolts corresponding to the limit grooves are fixedly installed on the top of the collection chamber, and the limit bolts are inserted into the limit grooves, a handrail is fixedly installed in the middle of the top of the fixing frame, and a sealing gasket is fixedly installed at the bottom of the substrate.

[0006] Preferably, the collection module includes an inlet frame and an outlet frame. The inlet frame is bolted to the top of its corresponding mounting bracket on both sides. Two supports are bolted to the outer wall of the inlet frame. The outlet frame is bolted to its corresponding supports on both sides. A rotating guide frame is rotatably mounted on the inner wall of the inlet frame. A return cylinder is fixedly mounted on the inner wall of the rotating guide frame. A manifold frame is fixedly and sealed through the bottom of the return cylinder. Several annularly arrayed polypropylene hollow fiber membranes are arranged between the inlet frame and the manifold frame. The polypropylene hollow fiber membrane is arranged at an inclined angle, and both ends of the polypropylene hollow fiber membrane are sealed and connected to the liquid inlet frame and the liquid outlet frame, respectively. The bottom end of the manifold frame is sealed with a base through a flange. The manifold frame and the base are closed to form a reflux chamber, and the reflux cylinder is connected to the reflux chamber. The bottom end of the base is provided with a slot for use with a guide block, and the guide block is inserted into the slot through a spline. The liquid inlet frame and the liquid outlet frame are respectively connected to the liquid inlet pipe and the liquid outlet pipe. The inner walls of the smoke inlet chamber and the smoke outlet chamber are respectively fixedly installed with a flow guide plate and a baffle plate.

[0007] Preferably, the limiting module includes two symmetrically distributed pull plates, and two symmetrically distributed guide columns are fixedly installed on the inner side of each pull plate. The guide columns are slidably sleeved in the guide cylinder, and the guide cylinder is fixedly installed on both sides of the top of the collection chamber. Limiting plates are fixedly installed at both ends of the pull plates near the guide columns, and the ends of the limiting plates are provided with arc-shaped grooves that cooperate with the limiting bolts. The outer wall of the limiting bolt is provided with a recess in the middle, and the arc-shaped groove is embedded in the recess. A tension spring is sleeved on the outer wall of the guide cylinder, and the two ends of the tension spring are fixedly connected to the inner wall of the pull plate and the outer wall of the collection chamber, respectively.

[0008] Preferably, the drive module includes a base frame and three equally spaced rotating shafts. The base frame is fixedly installed at the bottom of the collection chamber, and the three rotating shafts are all sealed and rotatably installed at the bottom of the collection chamber. A guide block is fixedly sleeved on the top of the rotating shaft. A low-speed permanent magnet synchronous motor is fixedly installed on one side of the bottom of the base frame, and the drive end of the low-speed permanent magnet synchronous motor is connected to the left rotating shaft through a coupling. The three rotating shafts are connected through a synchronous wheel transmission group.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention sets up a collection module and a drive module, so that the absorbent circulates in the polypropylene hollow fiber membrane that is arranged at an incline inside the collection module. At the same time, the drive module drives the collection module to rotate slowly as a whole through a low-speed permanent magnet synchronous motor, a rotating shaft and a spline. The two work together to effectively tear the gas phase boundary layer on the surface of the membrane fibers and significantly improve the CO2 absorption efficiency. 2. By setting up splicing and assembly modules and collection modules, the present invention integrates the collection unit and the mounting substrate into a single structure, realizing the overall quick assembly and disassembly of polypropylene hollow fiber membrane, greatly simplifying the maintenance and replacement process, and effectively solving the problems of cumbersome maintenance and long downtime of traditional devices. 3. By setting a limiting module, the present invention uses the preload of the tension spring to drive the limiting plate and the limiting bolt to fit precisely, thereby performing secondary limiting and fixing of the splicing assembly module and the collection module that are installed in place. This effectively prevents the module from loosening or shifting due to vibration and airflow impact during operation, thus ensuring the stability of the equipment operation. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overall front structure of the present invention; Figure 2 This is a schematic diagram of the overall disassembled structure of the front of the present invention; Figure 3 This is a schematic diagram of the overall dissected structure of the present invention; Figure 4 This is a schematic diagram of the splicing and assembly module installation structure in this invention; Figure 5 This is a schematic diagram of the exploded structure of the disassembled assembly module in this invention; Figure 6 This is a schematic diagram of the side profile of the capture module in this invention; Figure 7 This is a schematic diagram of the overall structure of the collection chamber in this invention; Figure 8 This is a schematic diagram of the limiting module structure in this invention; Figure 9 This is a schematic diagram of the drive module structure in this invention; Figure 10 for Figure 4 A magnified schematic diagram of the structure at point A in the middle.

[0012] In the diagram: 1. Collection chamber; 2. Smoke inlet chamber; 3. Smoke outlet chamber; 4. Assembly module; 401. Base plate; 402. Fixing frame; 403. Handrail; 404. Support; 405. Sealing gasket; 406. Limiting groove; 5. Collection module; 501. Liquid inlet frame; 502. Liquid outlet frame; 503. Rotating liquid guide frame; 504. Return cylinder; 505. Manifold frame; 506. Base; 507. Polypropylene intermediate Hollow fiber membrane; 508, inlet pipe; 509, outlet pipe; 510, slot; 511, guide plate; 512, baffle plate; 6, limit module; 601, pull plate; 602, guide post; 603, guide cylinder; 604, limit plate; 605, tension spring; 606, limit bolt; 7, drive module; 701, bottom frame; 702, rotating shaft; 703, guide block; 704, low-speed permanent magnet synchronous motor. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Example: Figure 1-10 As shown, the present invention provides a technical solution: a CO2 capture device in flue gas of a coal-fired power plant, including a capture chamber 1, with a flue gas inlet chamber 2 and a flue gas outlet chamber 3 respectively sealed at both ends of the capture chamber 1 by flanges, three equidistantly distributed splicing assembly modules 4 at the top of the capture chamber 1, a capture module 5 on the splicing assembly module 4, three equidistantly distributed limiting modules 6 at the top of the capture chamber 1 that cooperate with the splicing assembly module 4, and a drive module 7 at the bottom of the capture chamber 1; The splicing and assembly module 4 includes a base plate 401. Two symmetrically distributed fixing frames 402 are fixedly installed on the top of the base plate 401, and two symmetrically distributed supports 404 are provided above the fixing frames 402. The collection module 5 includes an inlet frame 501 and a drain frame 502. The inlet frame 501 is fixedly installed on the top of the corresponding fixed frame 402 by bolts on both sides. Two supports 404 are fixedly installed on the outer wall of the inlet frame 501 by bolts. The drain frame 502 is fixedly installed on the corresponding supports 404 by bolts on both sides. A rotating liquid guide frame 503 is rotatably installed on the inner wall of the inlet frame 501. A return cylinder 504 is fixedly installed on the inner wall of the rotating liquid guide frame 503. A manifold frame 505 is fixedly and sealed through the bottom end of the return cylinder 504. Several polypropylene hollow fiber membranes 507 are arranged in a ring array between the inlet frame 501 and the manifold frame 505. The polypropylene hollow fiber membranes 507 are arranged at a 5-degree tilt angle. The tilted arrangement of the polypropylene hollow fiber membranes (507) can effectively eliminate the dead zone of flue gas flow and improve the gas-liquid contact efficiency. The two ends of the polypropylene hollow fiber membranes 507 are respectively sealed and connected through the inlet frame 501 and the drain frame 502. The limiting module 6 includes two symmetrically distributed pull plates 601. Two symmetrically distributed guide posts 602 are fixedly installed on the inner side of each pull plate 601. The guide posts 602 are slidably sleeved in the guide cylinder 603, and the guide cylinder 603 is fixedly installed on both sides of the top of the collection chamber 1.

[0015] By adopting the above technical solution, the collection module 5 and the splicing assembly module 4 adopt an integrated design, which facilitates the quick disassembly and installation of the polypropylene hollow fiber membrane 507. The limiting module 6 performs secondary locking and limiting on the collection module 5 after it is installed in place, thereby improving the stability and sealing of the module during operation.

[0016] The drive module 7 includes a bottom frame 701 and three equally spaced rotating shafts 702. The bottom frame 701 is fixedly installed at the bottom of the collection chamber 1, and the three rotating shafts 702 are all sealed and rotatably installed at the bottom of the collection chamber 1. A guide block 703 is fixedly sleeved on the top of the rotating shaft 702.

[0017] By adopting the above technical solution, the drive module 7 provides the power transmission basis for the overall rotation of the capture module 5.

[0018] The bottom of the manifold 505 is sealed with a base 506 via a flange. The manifold 505 and the base 506 are closed to form a return cavity, and the return cylinder 504 is connected to the return cavity.

[0019] By adopting the above technical solution, the flow pressure of the absorbent can be buffered by setting a reflux cavity, thus ensuring a stable flow rate within the membrane fibers.

[0020] The bottom of the base 506 has a slot 510 that works in conjunction with the guide block 703, and the guide block 703 is inserted into the slot 510 via a spline connection.

[0021] By adopting the above technical solution, the spline fit can ensure rotational synchronization, avoid slippage, and facilitate module disassembly and replacement.

[0022] Limiting grooves 406 are provided at the four corners of the substrate 401. A limiting bolt 606 corresponding to the limiting groove 406 is fixedly installed at the top of the collection chamber 1, and the limiting bolt 606 is inserted into the limiting groove 406. Limiting plates 604 are fixedly installed at both ends of the pull plate 601 near the guide post 602. The end of the limiting plate 604 is provided with an arc-shaped groove that cooperates with the limiting bolt 606. The outer wall of the limiting bolt 606 is provided with a recess, and the arc-shaped groove is embedded in the recess.

[0023] By adopting the above technical solution, the cooperation between the limiting groove 406 and the limiting bolt 606 can ensure the accurate installation position of the module. The arc-shaped groove of the limiting plate 604 can be embedded in the recessed structure of the limiting bolt 606 to achieve secondary locking and ensure the stability of the equipment.

[0024] A tension spring 605 is fitted on the outer wall of the guide cylinder 603, and the two ends of the tension spring 605 are fixedly connected to the inner wall of the pull plate 601 and the outer wall of the collection chamber 1, respectively.

[0025] By adopting the above technical solution, the tension spring 605 applies a continuous preload to the limiting plate 604 through the tension plate 601, so that the limiting plate 604 always remains in contact with the limiting bolt 606.

[0026] A low-speed permanent magnet synchronous motor 704 is fixedly installed on one side of the bottom of the base frame 701, and the drive end of the low-speed permanent magnet synchronous motor 704 is connected to the left rotating shaft 702 through a coupling. The three rotating shafts 702 are connected through a synchronous wheel transmission group.

[0027] By adopting the above technical solution, the low-speed permanent magnet synchronous motor 704 drives the left rotating shaft 702 to rotate slowly, and drives the other two rotating shafts 702 to rotate synchronously through the synchronous wheel transmission group, with a speed of 5-10 r / min.

[0028] The inner walls of the smoke inlet chamber 2 and the smoke outlet chamber 3 are respectively fixedly installed with a guide plate 511 and a baffle plate 512. The guide plate 511 is in a constricted shape and is used to guide the flue gas to the polypropylene hollow fiber membrane 507 area. The baffle plate (512) is a straight plate perpendicular to the flue gas flow direction. The plate body has 20-30mm circular straight holes, the opening rate is 30%-40%, and the hole spacing is 40-60mm.

[0029] By adopting the above technical solution, the shrinking structure of the guide plate 511 can make the flue gas evenly distributed to the membrane fiber area and avoid flow deviation. The opening design of the turbulence plate 512 can form turbulence while ensuring the flow of flue gas, and tear the gas phase boundary layer on the surface of the membrane fiber.

[0030] A handrail 403 is fixedly installed at the top center of the mounting bracket 402, and a sealing gasket 405 is fixedly installed at the bottom of the base plate 401.

[0031] By adopting the above technical solution, the handrail 403 facilitates the manual handling and installation of the splicing and assembly module 4, and the sealing gasket 405 can ensure the airtightness between the collection chamber 1 and the splicing and assembly module 4 to prevent smoke leakage.

[0032] The inlet frame 501 and the outlet frame 502 are respectively connected by an inlet pipe 508 and an outlet pipe 509.

[0033] By adopting the above technical solution, the other end of the liquid inlet pipe 508 is connected to an external absorbent delivery pump to supply fresh absorbent to the interior of the polypropylene hollow fiber membrane 507, and the other end of the liquid outlet pipe 509 is connected to an external desorption tower to discharge the rich liquid after CO2 absorption for regeneration, thus constructing a closed loop of absorbent.

[0034] Working principle: In actual production and use, the flue gas from the coal-fired power plant enters through the flue gas inlet chamber 2 and is evenly guided by the internal contraction guide plate 511 to the polypropylene hollow fiber membrane 507 area in the collection chamber 1. The external absorbent enters the liquid inlet frame 501 through the liquid inlet pipe 508 and is evenly distributed to the interior of each polypropylene hollow fiber membrane 507 through the rotating liquid guide frame 503, forming a liquid phase mass transfer channel. The flue gas flows on the outside of the membrane fibers and comes into counter-current contact with the absorbent inside the membrane fibers. The CO2 in the flue gas is efficiently absorbed by the absorbent inside the membrane fibers. During this process, the low-speed permanent magnet synchronous motor 704 is activated by synchronous control. The low-speed permanent magnet synchronous motor 704 drives the entire collection module 5 to rotate at a low speed of 5–10 r / min through the spline cooperation of the rotating shaft 702, guide block 703 and base 506. The polypropylene hollow fiber membrane 507 is arranged at a 5° tilt angle. With the slow rotation, the dead zone of flue gas flow can be eliminated, so that the entire circumference of the membrane fiber can be in full contact with the flue gas, which greatly improves the effective mass transfer area. At the same time, the perforated baffle 512 set in the collection chamber 1 makes the flue gas form uniform turbulence, continuously tearing the gas phase boundary layer on the surface of the membrane fiber, further improving the CO2 absorption efficiency. The rich liquid after absorbing CO2 is collected through the manifold 505 and return cylinder 504, and transported to the external desorption tower for regeneration by the drain pipe 509, realizing the closed-loop recycling of the absorbent. The purified flue gas is discharged through the exhaust chamber 3. When installing the splicing assembly module 4 and the collection module 5, the operator lowers the splicing assembly module 4 and the collection module 5 together to the top of the collection chamber 1 using the handle 403. First, pull the two pull plates 601 outward to overcome the tension of the tension spring 605, so that the limiting plate 604 is in the unlocked state. Then, the module is slowly lowered so that the limiting groove 406 of the base plate 401 and the limiting bolt 606 are initially aligned and pre-positioned. At the same time, the guide block 703 is inserted into the slot 510 at the bottom of the base 506 to complete the power transmission docking. After the module is installed in place, the pull plate 601 is released. Under the tension of the tension spring 605, the pull plate 601 drives the limiting plate 604 to tighten inward, so that the arc groove of the limiting plate 604 automatically engages with the recessed part of the limiting bolt 606, completing the secondary automatic locking of the splicing assembly module 4. When it is necessary to disassemble the splicing assembly module 4 and the collection module 5, simply reverse the above steps.

[0035] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A CO2 capture device for flue gas from a coal-fired power plant, comprising a capture chamber (1), characterized in that: The two ends of the collection chamber (1) are respectively connected to the smoke inlet chamber (2) and the smoke outlet chamber (3) by flange sealing. The top of the collection chamber (1) is provided with three equally spaced splicing assembly modules (4). The splicing assembly modules (4) are provided with a collection module (5). The top of the collection chamber (1) is provided with three equally spaced limiting modules (6) that cooperate with the splicing assembly modules (4). The bottom of the collection chamber (1) is provided with a drive module (7). The splicing assembly module (4) includes a base plate (401), two symmetrically distributed fixing frames (402) are fixedly installed on the top of the base plate (401), two symmetrically distributed supports (404) are provided above the fixing frames (402), and limit grooves (406) are opened at the four corners of the base plate (401). The top of the collection chamber (1) is fixedly installed with a limit bolt (606) corresponding to the limit groove (406), and the limit bolt (606) is inserted into the limit groove (406). The collection module (5) includes an inlet frame (501) and a drain frame (502). The inlet frame (501) is fixedly mounted on the top of the corresponding fixing frame (402) on both sides by bolts. Two supports (404) are firmly mounted on the outer wall of the inlet frame (501) by bolts. The drain frame (502) is firmly mounted on the corresponding supports (404) on both sides by bolts. A rotating liquid guide frame (503) is rotatably installed on the inner wall of the inlet frame (501). 503) A reflux cylinder (504) is fixedly installed on the inner wall. A manifold (505) is fixedly and sealed through the bottom end of the reflux cylinder (504). A number of polypropylene hollow fiber membranes (507) are arranged in a ring array between the liquid inlet frame (501) and the manifold (505). The polypropylene hollow fiber membranes (507) are arranged at a 5-degree tilt angle, and the two ends of the polypropylene hollow fiber membranes (507) are sealed and connected through the liquid inlet frame (501) and the liquid outlet frame (502) respectively. The limiting module (6) includes two symmetrically distributed pull plates (601). Two symmetrically distributed guide columns (602) are fixedly installed on the inner side of each pull plate (601). The guide columns (602) are slidably sleeved in the guide cylinder (603), and the guide cylinder (603) is fixedly installed on both sides of the top of the collection chamber (1). Limiting plates (604) are fixedly installed at both ends of the pull plate (601) near the guide column (602). The end of the limiting plate (604) is provided with an arc-shaped groove that cooperates with the limiting bolt (606). The outer wall of the limiting bolt (606) is provided with a recess in the middle, and the arc-shaped groove is embedded in the recess.

2. The CO2 capture device in flue gas of a coal-fired power plant as described in claim 1, characterized in that, The drive module (7) includes a bottom frame (701) and three equally spaced rotating shafts (702). The bottom frame (701) is fixedly installed at the bottom of the collection chamber (1), and the three rotating shafts (702) are all sealed and rotatably installed at the bottom of the collection chamber (1). A guide block (703) is fixedly sleeved on the top of the rotating shaft (702).

3. The CO2 capture device in flue gas of a coal-fired power plant as described in claim 1, characterized in that, The bottom end of the manifold (505) is sealed with a base (506) by a flange. The manifold (505) and the base (506) are closed to form a return cavity, and the return cylinder (504) is connected to the return cavity.

4. The CO2 capture device in flue gas of a coal-fired power plant as described in claim 3, characterized in that, The base (506) has a slot (510) at its bottom end that is used in conjunction with the guide block (703), and the guide block (703) is inserted into the slot (510) by spline engagement.

5. The CO2 capture device in flue gas of a coal-fired power plant as described in claim 1, characterized in that, The outer wall of the guide cylinder (603) is fitted with a tension spring (605), and the two ends of the tension spring (605) are fixedly connected to the inner wall of the pull plate (601) and the outer wall of the collection chamber (1), respectively.

6. The CO2 capture device in flue gas of a coal-fired power plant as described in claim 2, characterized in that, A low-speed permanent magnet synchronous motor (704) is fixedly installed on one side of the bottom of the bottom frame (701), and the driving end of the low-speed permanent magnet synchronous motor (704) is connected to the left rotating shaft (702) through a coupling. The three rotating shafts (702) are connected through a synchronous wheel transmission group.

7. The CO2 capture device in flue gas of a coal-fired power plant as described in claim 1, characterized in that, The inner walls of the smoke inlet chamber (2) and the smoke outlet chamber (3) are respectively fixedly installed with a guide plate (511) and a baffle plate (512).

8. The CO2 capture device in flue gas of a coal-fired power plant as described in claim 1, characterized in that, A handrail (403) is fixedly installed at the top center of the fixed frame (402), and a sealing gasket (405) is fixedly installed at the bottom of the base plate (401).

9. A CO2 capture device for flue gas from a coal-fired power plant as described in claim 1, characterized in that, The inlet frame (501) and the outlet frame (502) are respectively connected by an inlet pipe (508) and an outlet pipe (509).

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