A flue gas carbon dioxide membrane adsorption purification device

Abstract

This utility model discloses a flue gas carbon dioxide membrane adsorption purification device, relating to the field of carbon dioxide membrane adsorption technology. The utility model includes a cold treatment structure comprising a membrane adsorption purification cylinder, a second mixing cylinder connected to the membrane adsorption purification cylinder via a pipe, a first mixing cylinder connected to the second mixing cylinder via a pipe, a pre-cooling cylinder located on one side of the first mixing cylinder, a cooling cylinder and a drying cylinder located below the pre-cooling cylinder and connected via a pipe, a liquid nitrogen tank located in front of the cooling cylinder, a spiral tube connected to the output end of the liquid nitrogen tank and spirally distributed inside the cooling cylinder, a desiccant located inside the drying cylinder, and an air inlet pipe connected to the pre-cooling cylinder and the first mixing cylinder; and a mixing structure comprising an installation shaft located inside the first mixing cylinder and multiple sets of stirring rods arranged in a ring array inside the first mixing cylinder. This utility model, by setting a cold treatment structure, solves the problem that polymer membranes are easily deformed by heat during carbon dioxide membrane adsorption purification, affecting the stability of membrane adsorption purification.

Description

Technical Field

[0001] This utility model relates to the field of carbon dioxide membrane adsorption technology, and in particular to a flue gas carbon dioxide membrane adsorption purification device. Background Technology

[0002] Flue gas is a mixture of gases produced during the industrial combustion or power generation of fuels. Carbon dioxide is an inevitable byproduct of fossil fuel combustion and a core greenhouse gas. The capture of carbon dioxide in flue gas mainly relies on chemical absorption methods, such as amine liquid absorption, and physical adsorption, such as solid adsorbents and membrane separation technology.

[0003] Polymer membranes are widely used; they resemble plastic films and are rolled up inside the separation cylinder. However, they are prone to deformation due to heat when treating carbon dioxide, affecting the stability of membrane adsorption and purification. Therefore, those skilled in the art have provided a flue gas carbon dioxide membrane adsorption purification device to solve the problems mentioned in the background art. 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 flue gas carbon dioxide membrane adsorption purification device, comprising,

[0007] The cold treatment structure includes a membrane adsorption purification cylinder, a second mixing cylinder connected to the membrane adsorption purification cylinder by a pipeline, a first mixing cylinder connected to the second mixing cylinder by a pipeline, a precooling cylinder located on one side of the first mixing cylinder, a cooling cylinder and a drying cylinder located below the precooling cylinder and connected by a pipeline, a liquid nitrogen tank located in front of the cooling cylinder, a spiral tube first connected to the output end of the liquid nitrogen tank and spirally distributed inside the cooling cylinder, a desiccant located inside the drying cylinder, and an air inlet pipe connected to the precooling cylinder and the first mixing cylinder.

[0008] as well as;

[0009] The mixing structure includes an installation shaft located inside the mixing cylinder and stirring rods arranged in multiple annular arrays inside the mixing cylinder.

[0010] Furthermore, the cooling cylinder, drying cylinder, precooling cylinder, and mixing cylinder are all horizontally distributed, and the two ends of the cooling cylinder, drying cylinder, precooling cylinder, and mixing cylinder are all funnel-shaped and relatively distributed.

[0011] Specifically, the horizontally structured cooling cylinder, drying cylinder, precooling cylinder, and mixing cylinder are all funnel-shaped with their ends relatively distributed to facilitate gas flow.

[0012] Furthermore, the output end of the spiral tube is provided with a serpentine tube arranged in a serpentine pattern inside the precooling cylinder, with one end of the serpentine tube penetrating through the precooling cylinder;

[0013] Specifically, the serpentine pipe extends the length of the pipeline, increasing the residual cooling capacity of the cooled liquid nitrogen to perform preliminary cooling of the treated flue gas, making full use of the residual cooling.

[0014] Furthermore, the drying cylinder is provided with multiple sets of staggered mesh covers inside, the desiccant is located inside the mesh covers, the mesh covers are provided with serpentine channels, and the edges of the mesh covers are provided with staggered openings.

[0015] Specifically, the pores inside the mesh cover ensure that the gas comes into contact with the desiccant inside. The gas is transported through channels, and the serpentine distribution of the channels extends the gas residence time and drying time. At the same time, the openings allow the serpentine channels to be connected.

[0016] Furthermore, a refrigeration pipe connected to the air inlet pipe is provided at one end of the drying cylinder, and a spiral tube is provided inside the mixing cylinder II;

[0017] Specifically, the refrigeration pipe delivers the cooled and dried gas into the refrigeration pipe, where it undergoes preliminary mixing inside the mixing cylinder one. The contact time between the pretreated flue gas and the cooling gas is extended through the spiral tube two.

[0018] Furthermore, the mixing cylinder is provided with symmetrically distributed bearing seats that are rotatably mounted to the mounting shaft. A motor is provided at the upper end of the mixing cylinder, and a rotating shaft is provided at the output end of the motor and rotatably mounted inside the mixing cylinder. A conical wheel is sleeved on the outer wall of the rotating shaft, and a conical wheel is sleeved on the outer wall of the mounting shaft that meshes with the conical wheel.

[0019] Specifically, the mounting shaft and the rotating shaft are driven by meshing of conical wheel one and conical wheel two, which in turn causes the motor located on the outside of the horizontal mixing drum one to drive the mounting shaft to rotate. The mounting shaft is supported by the bearing housing for rotation.

[0020] 2. Beneficial effects

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

[0022] In this invention, liquid nitrogen from a liquid nitrogen tank is introduced into a cooling cylinder to cool the air supplied to the cooling cylinder. The cooled air is then transported to a drying cylinder where it comes into contact with a desiccant for drying. The cooled and dried air is then mixed with flue gas (for dust removal / desulfurization pretreatment) to lower the flue gas temperature. The flue gas is then transported to a membrane adsorption purification cylinder at a low temperature for carbon dioxide membrane adsorption purification. The composite membrane inside the membrane adsorption purification cylinder utilizes the difference in dissolution-diffusion rates between carbon dioxide and other gases in the membrane material to achieve separation. At the same time, the effects of high temperatures on the composite membrane are avoided, ensuring stable use of the composite membrane.

[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 side view of the three-dimensional structure of the present invention;

[0027] Figure 3 This is a three-dimensional schematic diagram of the internal structure of the cold treatment structure of this utility model;

[0028] Figure 4 This is a side-view perspective of the internal structure of the cooling cylinder and drying cylinder of this utility model;

[0029] Figure 5 This is a front-view three-dimensional structural diagram of the internal structure of the mixing cylinder of this utility model.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 100. Cold treatment structure; 101. Membrane adsorption purification cylinder; 102. Liquid nitrogen tank; 103. Cooling cylinder; 104. Drying cylinder; 105. Pre-cooling cylinder; 106. Mixing cylinder one; 107. Mixing cylinder two; 108. Inlet pipe; 109. Refrigeration pipe; 110. Serpentine tube; 111. Spiral tube one; 112. Mesh cover; 113. Opening; 114. Channel;

[0032] 200. Hybrid structure; 201. Spiral tube II; 202. Mounting shaft; 203. Bearing housing; 204. Stirring rod; 205. Conical wheel I; 206. Conical wheel II; 207. Motor; 208. Rotating shaft. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Example 1

[0038] Please see Figure 1-5 As shown, this embodiment is a flue gas carbon dioxide membrane adsorption purification device, including,

[0039] The cold treatment structure 100 includes a membrane adsorption purification cylinder 101, a second mixing cylinder 107 connected to the membrane adsorption purification cylinder 101 by a pipe, a first mixing cylinder 106 connected to the second mixing cylinder 107 by a pipe, a precooling cylinder 105 located on one side of the first mixing cylinder 106, a cooling cylinder 103 and a drying cylinder 104 located below the precooling cylinder 105 and connected by a pipe, a liquid nitrogen tank 102 located in front of the cooling cylinder 103, a spiral tube 111 connected to the output end of the liquid nitrogen tank 102 and spirally distributed inside the cooling cylinder 103, a desiccant located inside the drying cylinder 104, and an air inlet pipe 108 connected to the precooling cylinder 105 and the first mixing cylinder 106.

[0040] Cooling cylinder 103, drying cylinder 104, precooling cylinder 105, and mixing cylinder 106 are all horizontally distributed, and the two ends of cooling cylinder 103, drying cylinder 104, precooling cylinder 105, and mixing cylinder 106 are all funnel-shaped and relatively distributed.

[0041] The spiral tube output end is provided with a serpentine tube 110 located inside the precooling cylinder 105 and distributed in a serpentine pattern, with one end of the serpentine tube 110 penetrating through the precooling cylinder 105;

[0042] The drying cylinder 104 is provided with multiple sets of staggered mesh covers 112 inside, the desiccant is located inside the mesh cover 112, the mesh covers 112 are provided with serpentine channels 114 between them, and the mesh covers 112 are provided with staggered openings 113 at their edges.

[0043] A refrigeration pipe 109 connected to the air inlet pipe 108 is provided at one end of the drying cylinder 104;

[0044] as well as;

[0045] The mixing structure 200 includes a mounting shaft 202 located inside the mixing cylinder 106 and stirring rods 204 arranged in multiple annular arrays inside the mixing cylinder 106.

[0046] The mixing cylinder 2 107 is equipped with a spiral tube 201 inside;

[0047] The mixing cylinder 106 is provided with symmetrically distributed bearing seats 203 that are rotatably mounted to the mounting shaft 202. The upper end of the mixing cylinder 106 is provided with a motor 207. The output end of the motor 207 is provided with a rotating shaft 208 that is rotatably mounted inside the mixing cylinder 106. A conical wheel 206 is sleeved on the outer wall of the rotating shaft 208. A conical wheel 205 that meshes with the conical wheel 206 is sleeved on the outer wall of the mounting shaft 202.

[0048] The cold treatment structure 100 is used;

[0049] The operator first starts the liquid nitrogen tank 102 to inject liquid nitrogen into the cooling cylinder 103. As the liquid nitrogen flows along the spiral tube 111, a phase change occurs, absorbing heat and lowering the air temperature inside the cooling cylinder 103. The flow rate of the liquid nitrogen is controlled by increasing the flow valve to adjust the cooling effect. At this time, the flue gas, after dust removal / desulfurization pretreatment, enters the precooling cylinder 105 through the inlet pipe 108. Air enters the cooling cylinder 103. It is worth noting that the air needs to undergo filtration pretreatment and is pumped into the cooling cylinder 103 to exchange heat with the low-temperature nitrogen output from the spiral tube 111. The heat-exchanged nitrogen is then transported into the precooling chamber, where it first undergoes preliminary cooling with the pretreated flue gas. Heat exchange is achieved through a serpentine tube 110 design that extends the path of cold energy transfer, allowing the flue gas to be initially cooled. The residual cold energy generated by the vaporization of liquid nitrogen is continuously released through the outer wall of the serpentine tube 110, forming a gradient cooling effect. The cooled gas enters the drying cylinder 104 and, when passing through the serpentine channel 114 formed by the multi-layer staggered mesh cover 112, it comes into full contact with the silica gel desiccant, reducing the relative humidity. The staggered openings 113 at the edges of the mesh cover 112 ensure that the gas flows in an S-shape, extending the drying time. The cooled and dried air is transported to the inlet pipe 108 through the refrigeration pipe 109 and then moved into the mixing cylinder 106. The cooled air comes into contact with the pretreated flue gas and undergoes heat exchange.

[0050] After drying, the low-temperature gas and the room-temperature flue gas undergo final temperature regulation in mixing cylinder 106. Motor 207 drives the rotating shaft 208 to rotate, which drives the stirring rod 204 on the mounting shaft 202 to rotate at high speed through the meshing transmission of bevel gears. Its ring array layout generates a turbulence effect, so that the hot and cold gases achieve temperature equilibrium. The spiral tube 201 in mixing cylinder 107 further extends the gas residence time. By enhancing convective heat transfer, the flue gas temperature is stabilized in the optimal working range of the membrane material, completely eliminating the risk of membrane thermal deformation caused by high temperature. The spiral polymer composite membrane inside begins to work. CO2 molecules preferentially dissolve due to the strong interaction with the ether bonds in the membrane material and are enriched on the permeate side, while N2, O2 and other molecules are retained due to their low solubility. At this time, the low temperature environment raises the glass transition temperature of the membrane material, and the movement of molecular chain segments is hindered, effectively suppressing the membrane expansion phenomenon and ensuring the stability of the selective layer pore structure.

[0051] Liquid nitrogen direct cooling, 110°C residual cooling utilization via serpentine tubes, and gas-gas mixing temperature regulation achieve gradient cooling of flue gas, solving the problem of high-temperature instability in traditional membrane separation systems and extending membrane lifespan.

[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 membrane adsorption purification device, characterized in that: include, The cold treatment structure (100) includes a membrane adsorption purification cylinder (101), a second mixing cylinder (107) connected to the membrane adsorption purification cylinder (101) by a pipe, a first mixing cylinder (106) connected to the second mixing cylinder (107) by a pipe, a precooling cylinder (105) located on one side of the first mixing cylinder (106), a cooling cylinder (103) and a drying cylinder (104) located below the precooling cylinder (105) and connected by a pipe, a liquid nitrogen tank (102) located in front of the cooling cylinder (103), a spiral tube (111) connected to the output end of the liquid nitrogen tank (102) and spirally distributed inside the cooling cylinder (103), a desiccant located inside the drying cylinder (104), and an air inlet pipe (108) connected to the precooling cylinder (105) and the first mixing cylinder (106). as well as; The mixing structure (200) includes an installation shaft (202) located inside the mixing cylinder (106) and stirring rods (204) arranged in multiple annular arrays inside the mixing cylinder (106).

2. The flue gas carbon dioxide membrane adsorption purification device according to claim 1, characterized in that: The cooling cylinder (103), drying cylinder (104), precooling cylinder (105), and mixing cylinder one (106) are all horizontally distributed, and the two ends of the cooling cylinder (103), drying cylinder (104), precooling cylinder (105), and mixing cylinder one (106) are all funnel-shaped and relatively distributed.

3. The flue gas carbon dioxide membrane adsorption purification device according to claim 1, characterized in that: The spiral tube output end is provided with a serpentine tube (110) located inside the precooling cylinder (105) and distributed in a serpentine pattern, with one end of the serpentine tube (110) penetrating through the precooling cylinder (105).

4. The flue gas carbon dioxide membrane adsorption purification device according to claim 1, characterized in that: The drying cylinder (104) is provided with multiple sets of staggered mesh covers (112) inside, the desiccant is located inside the mesh cover (112), the mesh covers (112) are provided with serpentine channels (114) between them, and the mesh covers (112) are provided with staggered openings (113) at their edges.

5. The flue gas carbon dioxide membrane adsorption purification device according to claim 1, characterized in that: The drying cylinder (104) is provided with a refrigeration pipe (109) that communicates with the air inlet pipe (108) at one end, and the mixing cylinder (107) is provided with a spiral tube (201).

6. The flue gas carbon dioxide membrane adsorption purification device according to claim 1, characterized in that: The mixing cylinder (106) is provided with symmetrically distributed bearing seats (203) that are rotatably mounted to the mounting shaft (202). The upper end of the mixing cylinder (106) is provided with a motor (207). The output end of the motor (207) is provided with a rotating shaft (208) that is rotatably mounted inside the mixing cylinder (106). The outer wall of the rotating shaft (208) is fitted with a conical wheel (206). The outer wall of the mounting shaft (202) is fitted with a conical wheel (205) that meshes with the conical wheel (206).

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