A flue gas carbon dioxide low-temperature condensation purification system

Abstract

The utility model discloses a kind of flue gas carbon dioxide low-temperature condensation purification systems, it is related to flue gas carbon dioxide processing technical field.The utility model includes, condensing structure, including conveying pipe, condensing box of sleeving in conveying pipe one side outer wall, liquid nitrogen tank located conveying pipe rear side, heat exchange pipe that is snakelike distribution in condensing box interior and outer wall is flat and is communicated with liquid nitrogen tank output end, conveying port that is staggered distribution between heat exchange pipe, the shrink nozzle of annular array distribution in conveying pipe one end and corresponding heat exchange pipe;Drying structure, including cylinder one and cylinder two located condensing box one side, net cylinder located cylinder one and cylinder two interior, drying agent that is granular in net cylinder interior.The utility model is set to condensing section structure, avoid under high temperature CO2 plasticization effect enhancement, polymer chain spacing expansion, support layer and skin layer thermal expansion shrinkage or skin layer peeling, affect carbon dioxide purification process membrane adsorption stability problem.

Description

Technical Field

[0001] This utility model relates to the field of flue gas carbon dioxide treatment technology, and in particular to a low-temperature condensation purification system for flue gas carbon dioxide. Background Technology

[0002] Flue gas is a product of fuel combustion or industrial chemical reactions. Its core components and environmental impact are closely related to carbon dioxide. Any combustion of coal, oil, natural gas, or biomass will inevitably produce carbon dioxide, which is a thermodynamic result of carbon oxidation.

[0003] Capturing carbon dioxide from flue gas using membrane adsorption technology offers both high efficiency and energy-saving potential. However, the stability of composite membranes faces severe challenges at high temperatures. Industrial flue gas temperatures often reach 100–150°C, far exceeding the stable operating range of most polymer membranes. At high temperatures, the plasticizing effect of CO2 is enhanced, polymer chain spacing widens, and thermal expansion and contraction of the support layer and skin layer, or skin layer peeling, affects the stability of membrane adsorption during the carbon dioxide purification process. Therefore, those skilled in the art have provided a low-temperature condensation purification system for carbon dioxide in flue gas to address the problems mentioned in the background. Utility Model Content

[0004] 1. Technical Solution

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a low-temperature condensation and purification system for flue gas carbon dioxide, comprising:

[0007] The condensation structure includes a delivery pipe, a condensation box fitted onto the outer wall of one side of the delivery pipe, a liquid nitrogen tank located behind the delivery pipe, heat exchange tubes arranged in a serpentine pattern inside the condensation box with flat outer walls and connected to the output end of the liquid nitrogen tank, delivery ports arranged alternately between the heat exchange tubes, and constriction nozzles arranged in a ring array at one end of the delivery pipe corresponding to the heat exchange tubes.

[0008] as well as;

[0009] The drying structure includes cylinder one and cylinder two located on one side of the condenser, a mesh cylinder located inside cylinder one and cylinder two, and a granular desiccant located inside the mesh cylinder.

[0010] Furthermore, a flow guide shroud with a gradually decreasing inner diameter is provided between the conveying pipe and the constriction nozzle, and an inner chamfer is provided at the opening where the flow guide shroud connects to the constriction nozzle.

[0011] Specifically, the guide hood guides the flow of flue gas through a pair of delivery pipes, and reduces resistance by using an inner chamfer when the gas is output through a constrictor nozzle.

[0012] Furthermore, a funnel is provided at the lower end of the condenser box, a discharge pipe is provided at the lower end of the funnel, a cover is threadedly installed on the outer wall of the lower end of the discharge pipe, and a sealing gasket is provided on the inner wall of the lower end of the cover.

[0013] Specifically, the condensed droplets are transported through a funnel and discharged through a drain pipe. The cap controls the opening and closing of the drain pipe, and the sealing gasket improves the seal between the drain pipe and the sleeve.

[0014] Furthermore, a flow guide hood with a gradually decreasing inner diameter is provided at one end of the condenser box, a connecting pipe connected to the mesh cylinder is provided at one end of the flow guide hood, and a diffuser hood with an enlarged inner diameter and connected to the barrel body is provided at the other end of the flow guide hood.

[0015] Specifically, the second guide hood guides the flue gas, and the diffuser reduces the pressure of the condensed flue gas entering the first cylinder, while also allowing the flue gas to diffuse rapidly and enter the inside of the mesh cylinder evenly on the outer wall of the mesh cylinder to contact the desiccant.

[0016] Furthermore, both the outer walls of the first cylinder and the second cylinder are fitted with mating plates, which are fixed together by bolts. The inner wall of the second cylinder is provided with a support ring connected to the mesh cylinder. One end of the mesh cylinder is provided with a side ring, one end of the side ring is provided with a sealing ring, and one end of the side ring is provided with a closing cap.

[0017] Specifically, the closing cover controls the opening and closing of one end of the side ring to prevent desiccant leakage inside the mesh cylinder, and the sealing ring improves the sealing performance between the sealing ring and the side ring.

[0018] Furthermore, one end of the side ring is provided with a damping shaft seat arranged in a ring array. A rotating shaft is rotatably mounted inside the damping shaft seat. A rotating plate is provided at one end of the rotating shaft. A pressure plate is provided on one side of the rotating plate. A spring is provided between the pressure plate and the rotating plate. A sliding sleeve is embedded inside the rotating plate. A guide rod located inside the spring and sliding through the sliding sleeve is provided at one end of the pressure plate. A handle is provided at one end of the guide rod.

[0019] Specifically, the handle allows for the application of pulling force to the pressure plate via the guide rod, which in turn compresses the spring. The spring rotates inside the damping seat via the rotating shaft. After rotation, the damping element inside the damping seat applies resistance for positioning, and the rotating shaft drives the rotating plate to rotate with the pressure plate.

[0020] 2. Beneficial effects

[0021] Compared with existing technologies, the advantages of this utility model are:

[0022] In this invention, the filtered and desulfurized flue gas is transported through a conveying pipe. The conveying pipe outputs the high-temperature flue gas through a nozzle, reducing its temperature upon exiting the nozzle. The jetting airflow acts on a heat exchange tube, which carries a cooling medium to exchange heat with the flue gas. The heat exchange tube is serpentine in shape with a flat outer wall, increasing the contact between the flue gas and the heat exchange tube. The serpentine flow also increases the heat exchange time. During membrane adsorption purification, the high temperature of the flue gas after heat exchange avoids affecting the composite membrane, ensuring the stable use of the composite membrane during carbon dioxide purification.

[0023] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front-view three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a three-dimensional cross-sectional view of the condenser box of this utility model;

[0027] Figure 3 This is a schematic diagram of the three-dimensional cross-sectional structure of the network communication system of this utility model;

[0028] Figure 4 This is a front-view three-dimensional structural diagram of the pressure plate of this utility model;

[0029] Figure 5 This is a side perspective three-dimensional structural diagram of the air guide cover of this utility model;

[0030] Figure 6 This is a side view of the three-dimensional structure of the nozzle of this utility model.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 100. Condensation structure; 101. Delivery pipe; 102. Condensation box; 103. Heat exchanger tube; 104. Liquid nitrogen tank; 105. Cover; 106. Flow guide; 107. Discharge pipe; 108. Funnel; 109. Delivery port; 110. Constriction nozzle; 111. Inner chamfer;

[0033] 200. Drying structure; 201. Connecting pipe; 202. Diffuser hood; 203. Cylinder 1; 204. Cylinder 2; 205. Connecting plate; 206. Closing cover; 207. Handle; 208. Support ring; 209. Mesh cylinder; 210. Side ring; 211. Sealing ring; 212. Guide rod; 213. Rotating plate; 214. Rotating shaft; 215. Damping shaft seat; 216. Pressure plate; 217. Spring; 218. Sliding sleeve. Detailed Implementation

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0038] Example 1

[0039] Please see Figure 1-6 As shown, this embodiment is a flue gas carbon dioxide low-temperature condensation purification system, including,

[0040] The condensation structure 100 includes a conveying pipe 101, a condensation box 102 sleeved on one side of the outer wall of the conveying pipe 101, a liquid nitrogen tank 104 located behind the conveying pipe 101, heat exchange tubes 103 arranged in a serpentine pattern inside the condensation box 102 with flat outer walls and connected to the output end of the liquid nitrogen tank 104, conveying ports 109 staggered between the heat exchange tubes 103, and constriction nozzles 110 arranged in a ring array at one end of the conveying pipe 101 and corresponding to the heat exchange tubes 103.

[0041] as well as;

[0042] The drying structure 200 includes a first cylinder 203 and a second cylinder 204 located on one side of the condenser 102, a mesh cylinder 209 located inside the first cylinder 203 and the second cylinder 204, and a granular desiccant located inside the mesh cylinder 209.

[0043] A flow guide shroud 106 with a gradually decreasing inner diameter is provided between the conveying pipe 101 and the constriction nozzle 110, and an inner chamfer 111 is provided at the connection opening between the flow guide shroud and the constriction nozzle 110.

[0044] A funnel 108 is provided at the lower end of the condenser box 102, and a discharge pipe 107 is provided at the lower end of the funnel 108. A cover 105 is threadedly installed on the outer wall of the lower end of the discharge pipe 107, and a sealing gasket is provided on the inner wall of the lower end of the cover 105.

[0045] One end of the condenser box 102 is provided with a flow guide shroud 112 with a gradually decreasing inner diameter. One end of the flow guide shroud 112 is provided with a connecting pipe 201 connected to the mesh cylinder 209. The other end of the flow guide shroud 112 is provided with a diffuser shroud 202 with an enlarged inner diameter connected to the barrel body.

[0046] Both cylinder body 1 203 and cylinder body 204 are fitted with connecting plates 205 on their outer walls. The connecting plates 205 are fixed together by bolts. The inner wall of cylinder body 204 is provided with a support ring 208 connected to the mesh cylinder 209. One end of the mesh cylinder 209 is provided with a side ring 210, one end of the side ring 210 is provided with a sealing ring 211, and one end of the side ring 210 is provided with a closing cover 206.

[0047] A damping bearing seat 215 arranged in a circular array is provided at one end of the side ring 210. A rotating shaft 214 is rotatably mounted inside the damping bearing seat 215. A rotating plate 213 is provided at one end of the rotating shaft 214. A pressure plate 216 is provided on one side of the rotating plate 213. A spring 217 is provided between the pressure plate 216 and the rotating plate 213. A sliding sleeve 218 is embedded inside the rotating plate 213. A guide rod 212 located inside the spring 217 and sliding through the sliding sleeve 218 is provided at one end of the pressure plate 216. A handle 207 is provided at one end of the guide rod 212.

[0048] The condensation structure 100 and the drying structure 200 are used;

[0049] During system operation, the high-temperature flue gas after desulfurization enters the condensation structure 100 through the conveying pipe 101. Under the guidance of the flow guide, it forms an annular airflow, which is accelerated by the constrictor 110 and then sprayed into the serpentine heat exchange tube 103 in the condensation box 102. The heat exchange tube 103 adopts a flat design, which increases the contact area between the outer wall and the flue gas. The liquid nitrogen flowing inside achieves efficient heat exchange through phase change heat absorption, causing the flue gas temperature to drop sharply. During this process, the water vapor in the flue gas condenses into droplets, which are collected along the inner wall of the condensation box 102 through the funnel 108 and discharged periodically through the discharge pipe 107 to prevent moisture from entering the downstream membrane module.

[0050] The constrictor nozzle 110 increases the flue gas velocity through the Venturi effect, enhancing turbulent heat transfer. The serpentine heat exchange tube 103 extends the flue gas residence time. Combined with the low-temperature drive of liquid nitrogen, the flue gas temperature is rapidly reduced. The condensed flue gas is depressurized and diffused through the diffuser hood 202, and enters the two-stage drying unit composed of cylinder one 203 and cylinder two 204 in a laminar flow state. The molecular sieve desiccant filled in the mesh cylinder 209 removes residual moisture through physical adsorption, reducing the relative humidity and eliminating the plasticizing effect of water vapor on the membrane material.

[0051] The pretreated flue gas temperature is lower than the glass transition temperature of high-temperature membrane materials such as polyimide, which improves the stability of CO2 permeation flux and extends the service life. The modular drying cylinder design supports quick replacement. The inner wall of the condenser 102 is coated with a superhydrophobic coating, which, together with the self-cleaning thread of the discharge pipe 107, reduces the deposition rate of viscous byproducts such as ammonium bisulfate. The thermodynamic coupling process enables precise control of flue gas conditions, which reduces the replacement frequency of membrane modules while ensuring CO2 capture rate, and significantly reduces the total life cycle cost.

[0052] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flue gas carbon dioxide cryogenic condensation purification system, characterized in that: include, The condensation structure (100) includes a delivery pipe (101), a condensation box (102) sleeved on one side of the outer wall of the delivery pipe (101), a liquid nitrogen tank (104) located behind the delivery pipe (101), heat exchange tubes (103) arranged in a serpentine pattern inside the condensation box (102) with flat outer walls and connected to the output end of the liquid nitrogen tank (104), delivery ports (109) arranged alternately between the heat exchange tubes (103), and constriction nozzles (110) arranged in a ring array at one end of the delivery pipe (101) and corresponding to the heat exchange tubes (103). as well as; The drying structure (200) includes a first cylinder (203) and a second cylinder (204) located on one side of the condenser (102), a mesh cylinder (209) located inside the first cylinder (203) and the second cylinder (204), and a granular desiccant located inside the mesh cylinder (209).

2. The flue gas carbon dioxide low-temperature condensation purification system according to claim 1, characterized in that: A flow guide shroud (106) with a gradually decreasing inner diameter is provided between the conveying pipe (101) and the constriction nozzle (110), and an inner chamfer (111) is provided at the opening where the flow guide shroud connects to the constriction nozzle (110).

3. The flue gas carbon dioxide low-temperature condensation purification system according to claim 1, characterized in that: The lower end of the condenser box (102) is provided with a funnel (108), the lower end of the funnel (108) is provided with a discharge pipe (107), the lower end of the discharge pipe (107) is threadedly fitted with a cover (105), and the lower end of the cover (105) is provided with a sealing gasket.

4. The flue gas carbon dioxide low-temperature condensation purification system according to claim 1, characterized in that: The condenser box (102) is provided with a flow guide hood (112) with a gradually decreasing inner diameter at one end. The flow guide hood (112) is provided with a connecting pipe (201) connected to the mesh cylinder (209) at one end. The flow guide hood (112) is provided with a diffuser hood (202) with an enlarged inner diameter connected to the barrel body at the other end.

5. The flue gas carbon dioxide low-temperature condensation purification system according to claim 1, characterized in that: Both the outer walls of the first cylinder (203) and the second cylinder (204) are fitted with connecting plates (205), which are fixed together by bolts. The inner wall of the second cylinder (204) is provided with a support ring (208) connected to the mesh cylinder (209). One end of the mesh cylinder (209) is provided with a side ring (210), one end of the side ring (210) is provided with a sealing ring (211), and one end of the side ring (210) is provided with a closing cap (206).

6. The flue gas carbon dioxide low-temperature condensation purification system according to claim 5, characterized in that: One end of the side ring (210) is provided with a damping shaft seat (215) arranged in a ring array. A rotating shaft (214) is rotatably installed inside the damping shaft seat (215). A rotating plate (213) is provided at one end of the rotating shaft (214). A pressure plate (216) is provided on one side of the rotating plate (213). A spring (217) is provided between the pressure plate (216) and the rotating plate (213). A sliding sleeve (218) is embedded inside the rotating plate (213). A guide rod (212) located inside the spring (217) and sliding through the sliding sleeve (218) is provided at one end of the pressure plate (216). A handle (207) is provided at one end of the guide rod (212).

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