Bipolar membrane electrodialysis carbon dioxide absorption device

Abstract

The utility model discloses a bipolar membrane electrodialysis carbon dioxide absorption device which comprises a power supply, a cathode, a cathode side polar plate, a bipolar membrane, a cation exchange membrane, a resin membrane, an anion exchange membrane, an anode side polar plate, an anode, a cathode box, an anode box, a sodium hydroxide box, a carbon dioxide recovery box and an MDEA liquid box, the bipolar membrane, the cation exchange membrane, the resin membrane and the anion exchange membrane form an absorption unit, a plurality of absorption units are sequentially arranged to form a membrane stack, the membrane stack is located between the cathode side polar plate and the anode side polar plate, and the bipolar membrane is further arranged on the left side of the anode side polar plate; the bipolar membrane, the cation exchange membrane, the resin membrane and the anion exchange membrane form a membrane stack; the cathode box, the anode box, the sodium hydroxide box, the carbon dioxide recycling box and the MDEA liquid box are connected to the upper side and the lower side of the membrane stack through pipelines. According to the bipolar membrane electrodialysis carbon dioxide absorption device provided by the utility model, the recovery efficiency of carbon dioxide is improved, and the loss of MDEA is reduced.

Description

Technical Field

[0001] The utility model specifically relates to a bipolar membrane electrodialysis carbon dioxide absorption device. Background Art

[0002] In the context of global carbon neutrality and environmental protection, environmental protection is particularly important for multiple industries such as electricity, oil and gas, chemicals, cement and steel. In particular, in the context of global carbon neutrality and environmental protection, the recovery of carbon dioxide is an important direction that needs to be paid attention to in the above industries. The existing electrodialysis carbon dioxide recovery technology has the defects of low carbon dioxide recovery efficiency and large MDEA loss. Utility Model Content

[0003] The utility model provides a bipolar membrane electrodialysis carbon dioxide absorption device to solve the above-mentioned technical problems, and specifically adopts the following technical solutions:

[0004] A bipolar membrane electrodialysis carbon dioxide absorption device, comprising: a power supply, a cathode, a cathode side plate, a bipolar membrane, a cation exchange membrane, a resin membrane, an anion exchange membrane, an anode side plate, an anode, a cathode box, an anode box, a sodium hydroxide box, a carbon dioxide recovery box and an MDEA liquid tank;

[0005] The cathode is connected to the cathode side plate, the anode is connected to the anode side plate, and the cathode and the anode are connected to the power supply through wires;

[0006] The bipolar membrane, the cation exchange membrane, the resin membrane and the anion exchange membrane form an absorption unit, and a plurality of the absorption units are arranged in sequence to form a membrane stack, the membrane stack is located between the cathode side plate and the anode side plate, and the bipolar membrane is also provided on the left side of the anode side plate;

[0007] The cathode box, the anode box, the sodium hydroxide box, the carbon dioxide recovery box and the MDEA liquid tank are connected to the upper and lower sides of the membrane stack through pipelines, and the cathode box is connected to the chamber between the cathode side plate and the bipolar membrane, the anode box is connected to the chamber between the anode side plate and the bipolar membrane, the sodium hydroxide box is connected to the chamber between the bipolar membrane and the cation exchange membrane, the carbon dioxide recovery tank is connected to the chamber between the anion exchange membrane and the bipolar membrane, and the MDEA liquid tank is connected to the chamber between the cation exchange membrane and the anion exchange membrane.

[0008] Furthermore, the bipolar membrane electrodialysis carbon dioxide absorption device also includes a plurality of partitions, which are respectively located between the cathode and the cathode side plate, between the bipolar membrane and the cation exchange membrane, between the cation exchange membrane and the resin, and between the anion exchange membrane and the anode side plate.

[0009] Furthermore, the bipolar membrane electrodialysis carbon dioxide absorption device further comprises a first pump, which is arranged in the pipeline between the cathode box and the membrane stack.

[0010] Furthermore, the bipolar membrane electrodialysis carbon dioxide absorption device further comprises a second pump, which is arranged in the pipeline between the anode box and the membrane stack.

[0011] Furthermore, the bipolar membrane electrodialysis carbon dioxide absorption device also includes a third pump, and the third pump is arranged in the pipeline between the sodium hydroxide tank and the membrane stack.

[0012] Furthermore, the bipolar membrane electrodialysis carbon dioxide absorption device further comprises a fourth pump, and the fourth pump is arranged in the pipeline between the carbon dioxide recovery tank and the membrane stack.

[0013] Furthermore, the bipolar membrane electrodialysis carbon dioxide absorption device further comprises a fifth pump, which is arranged in the pipeline between the MDEA liquid tank and the membrane stack.

[0014] The utility model is beneficial in that the provided bipolar membrane electrodialysis carbon dioxide absorption device improves the carbon dioxide recovery efficiency and reduces the loss of MDEA. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a schematic diagram of a bipolar membrane electrodialysis carbon dioxide absorption device of the utility model;

[0017] Power supply 1, cathode 2, cathode side plate 3, bipolar membrane 4, cation exchange membrane 5, resin membrane 6, anion exchange membrane 7, anode side plate 9, anode 10, cathode box 11, anode box 12, sodium hydroxide box 13, carbon dioxide recovery box 14, MDEA liquid tank 15. DETAILED DESCRIPTION

[0018] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0019] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0020] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0021] like Figure 1 The figure shows a bipolar membrane electrodialysis carbon dioxide absorption device of the present application, comprising: a power supply 1, a cathode 2, a cathode side electrode plate 3, a bipolar membrane 4 (BPM), a cation exchange membrane 5 (CEM), a resin membrane 6, an anion exchange membrane 7 (AEM), an anode side electrode plate 9, an anode 10, a cathode box 11, an anode box 12, a sodium hydroxide box 13, a carbon dioxide recovery box 14 and an MDEA liquid tank 15.

[0022] Among them, the cathode 2 is connected to the cathode side plate 3, the anode 10 is connected to the anode side plate 9, and the cathode 2 and the anode 10 are connected to the power supply 1 through wires. The bipolar membrane 4, the cation exchange membrane 5, the resin membrane 6 and the anion exchange membrane 7 form an absorption unit, and multiple absorption units are arranged in sequence to form a membrane stack, and the membrane stack is located between the cathode side plate 3 and the anode side plate 9. An additional bipolar membrane 4 is provided on the left side of the anode side plate 9.

[0023] The cathode box 11, the anode box 12, the sodium hydroxide box 13, the carbon dioxide recovery box 14 and the MDEA liquid tank 15 are connected to the upper and lower sides of the membrane stack through independent pipelines, respectively. Specifically, the cathode box 11 is connected to the chamber between the cathode side plate 3 and the bipolar membrane 4. Here, the chamber refers to the space between the cathode side plate 3 and the bipolar membrane 4. The anode box 12 is connected to the chamber between the anode side plate 9 and the bipolar membrane 4. The sodium hydroxide box 13 is connected to the chamber between the bipolar membrane 4 and the cation exchange membrane 5. The carbon dioxide recovery box 14 is connected to the chamber between the anion exchange membrane 7 and the bipolar membrane 4, and the MDEA liquid tank 15 is connected to the chamber between the cation exchange membrane 5 and the anion exchange membrane 7.

[0024] The bipolar membrane is usually composed of a cation exchange layer, an intermediate layer and an anion exchange layer. When the device is powered on, water molecules will dissociate into hydrogen ions and hydroxide ions on the intermediate layer of the bipolar membrane under the action of the current, and migrate in different directions through the cation / anion exchange layer under the action of the electric field. Between the bipolar membrane 4 and the cation exchange membrane 5, the hydroxide ions and cations combine to form an alkaline chamber.

[0025] In the present application, the bipolar membrane electrodialysis carbon dioxide absorption device integrates BPM membrane, CEM membrane, resin membrane 6 and AEM membrane. Specifically, H is generated by water electrolysis on both sides of the BPM membrane. + and OH - , the HCO3 bound in MDEA is bound between the AEM membrane and the CEM membrane - and CO3 2- Separation is carried out through ion exchange membrane separation process. At the same time, through the use of adsorbents, HCO3 is selectively absorbed and regenerated - and CO3 2- ions, making the recovery of carbon dioxide more thorough. Moreover, through the organic combination of BPM membrane, CEM membrane, resin membrane 6 and AEM membrane, the simultaneous recovery of CO2 and MDEA is achieved. The present application provides an efficient, flexible and low-energy carbon dioxide recovery solution, which improves the carbon dioxide recovery efficiency and reduces the loss of MDEA.

[0026] In an embodiment of the present application, the bipolar membrane electrodialysis carbon dioxide absorption device further comprises a plurality of partitions, which are respectively located between the cathode 2 and the cathode side plate 3, between the bipolar membrane and the cation exchange membrane 5, between the cation exchange membrane 5 and the resin, and between the anion exchange membrane 7 and the anode side plate 9.

[0027] In an embodiment of the present application, the bipolar membrane electrodialysis carbon dioxide absorption device further includes a first pump (not shown), which is arranged in the pipeline between the cathode box 11 and the membrane stack. Under the action of the first pump, the water flow direction in the room between the cathode side plate 3 and the bipolar membrane 4 is from bottom to top. The bipolar membrane electrodialysis carbon dioxide absorption device also includes a second pump (not shown), which is arranged in the pipeline between the anode box 12 and the membrane stack. Under the action of the second pump, the water flow direction in the room between the anode side plate 9 and the bipolar membrane 4 is from bottom to top. The bipolar membrane electrodialysis carbon dioxide absorption device also includes a third pump (not shown), which is arranged in the pipeline between the sodium hydroxide box 13 and the membrane stack. Under the action of the third pump, the water flow direction in the room between the bipolar membrane 4 and the cation exchange membrane 5 is from bottom to top. The bipolar membrane electrodialysis carbon dioxide absorption device also includes a fourth pump (not shown), which is arranged in the pipeline between the carbon dioxide recovery box 14 and the membrane stack. Under the action of the fourth pump, the water flow direction in the room between the anion exchange membrane 7 and the bipolar membrane 4 is from bottom to top. The bipolar membrane electrodialysis carbon dioxide absorption device further comprises a fifth pump (not shown), which is arranged in the pipeline between the MDEA liquid tank 15 and the membrane stack. Under the action of the fifth pump, the water flow in the chamber between the cation exchange membrane 5 and the anion exchange membrane 7 flows from bottom to top.

[0028] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the above embodiments do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A bipolar membrane electrodialysis carbon dioxide absorption device, characterized in that: Contains: power supply, cathode, cathode side plate, bipolar membrane, cation exchange membrane, resin membrane, anion exchange membrane, anode side plate, anode, cathode box, anode box, sodium hydroxide box, carbon dioxide recovery box and MDEA liquid tank; The cathode is connected to the cathode side plate, the anode is connected to the anode side plate, and the cathode and the anode are connected to the power supply through wires; The bipolar membrane, the cation exchange membrane, the resin membrane and the anion exchange membrane form an absorption unit, and a plurality of the absorption units are arranged in sequence to form a membrane stack, the membrane stack is located between the cathode side plate and the anode side plate, and the bipolar membrane is also provided on the left side of the anode side plate; The cathode box, the anode box, the sodium hydroxide box, the carbon dioxide recovery box and the MDEA liquid tank are connected to the upper and lower sides of the membrane stack through pipelines, and the cathode box is connected to the chamber between the cathode side plate and the bipolar membrane, the anode box is connected to the chamber between the anode side plate and the bipolar membrane, the sodium hydroxide box is connected to the chamber between the bipolar membrane and the cation exchange membrane, the carbon dioxide recovery tank is connected to the chamber between the anion exchange membrane and the bipolar membrane, and the MDEA liquid tank is connected to the chamber between the cation exchange membrane and the anion exchange membrane.

2. The bipolar membrane electrodialysis carbon dioxide absorption device according to claim 1, characterized in that: The bipolar membrane electrodialysis carbon dioxide absorption device also includes a plurality of partitions, which are respectively located between the cathode and the cathode side plate, between the bipolar membrane and the cation exchange membrane, between the cation exchange membrane and the resin, and between the anion exchange membrane and the anode side plate.

3. The bipolar membrane electrodialysis carbon dioxide absorption device according to claim 1, characterized in that: The bipolar membrane electrodialysis carbon dioxide absorption device further comprises a first pump, which is arranged in the pipeline between the cathode box and the membrane stack.

4. The bipolar membrane electrodialysis carbon dioxide absorption device according to claim 1, characterized in that: The bipolar membrane electrodialysis carbon dioxide absorption device further comprises a second pump, which is arranged in the pipeline between the anode box and the membrane stack.

5. The bipolar membrane electrodialysis carbon dioxide absorption device according to claim 1, characterized in that: The bipolar membrane electrodialysis carbon dioxide absorption device further comprises a third pump, which is arranged in the pipeline between the sodium hydroxide tank and the membrane stack.

6. The bipolar membrane electrodialysis carbon dioxide absorption device according to claim 1, characterized in that: The bipolar membrane electrodialysis carbon dioxide absorption device further comprises a fourth pump, which is arranged in the pipeline between the carbon dioxide recovery tank and the membrane stack.

7. The bipolar membrane electrodialysis carbon dioxide absorption device according to claim 1, characterized in that: The bipolar membrane electrodialysis carbon dioxide absorption device further comprises a fifth pump, which is arranged in the pipeline between the MDEA liquid tank and the membrane stack.

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