Flue gas water recovery device

Abstract

The utility model discloses a flue gas water recovery device which comprises a plurality of hollow selective thin film columns, the selective thin film columns are vertically arranged in a water-containing flue gas discharge channel, heat transfer pieces are embedded in inner cavities of the selective thin film columns, and gaps are reserved between the heat transfer pieces and the inner walls of the inner cavities of the selective thin film columns. And the top end and the bottom end of the selective film column are externally communicated with an extraction opening of an extraction device and a water collection opening of a water collection device respectively. Negative pressure can be kept in the inner cavity of the selective film column through air exhaust of the air exhaust device, water vapor in flue gas enters the selective film column under the action of osmotic pressure and exchanges heat with the outer wall of the heat transfer part to be condensed, condensed water drops flow into the water collecting device under the action of gravity, water in the flue gas is effectively recycled, and the recovery efficiency of the flue gas is improved. Water resources are saved, white smoke plume is greatly reduced in the smoke with moisture removed, smoke emission is more harmless visually, and waste heat of the smoke can be recycled and reused conveniently through pumped-out hot gas.

Description

Technical Field

[0001] The utility model relates to a flue gas water recovery device, belonging to the field of lithium battery preparation. Background Art

[0002] When a spray dryer dries lithium iron phosphate slurry to prepare a lithium iron phosphate precursor, water in the slurry is discharged from the chimney as steam with the exhaust gas. This water is not only unrecyclable and wastes resources, but also forms a white smoke plume after exiting the chimney, giving people a serious visual impression of pollution. Utility Model Content

[0003] The utility model provides a flue gas water recovery device, which solves the problems disclosed in the background technology.

[0004] According to one aspect of the present disclosure, a flue gas water recovery device is provided, comprising a plurality of hollow selective membrane columns, wherein the selective membrane columns are vertically arranged in a water-containing flue gas discharge channel, a heat transfer element is embedded in the inner cavity of the selective membrane column, and a gap is left between the heat transfer element and the inner wall of the inner cavity of the selective membrane column, and the top and bottom ends of the selective membrane column are respectively connected to the exhaust port of the exhaust device and the water collection port of the water collection device.

[0005] The vacuum device exhausts air to maintain a negative pressure in the inner cavity of the selective membrane column. Water vapor in the flue gas enters the selective membrane column under the action of osmotic pressure, and condenses through heat exchange with the outer wall of the heat transfer element. The condensed water droplets flow into the water collection device under the action of gravity, effectively realizing the recovery of moisture in the flue gas and saving water resources. The flue gas after moisture removal greatly reduces the white smoke plume, making the flue gas emission more visually harmless, and the extracted hot air facilitates the recovery and reuse of the waste heat of the flue gas.

[0006] In some embodiments of the present disclosure, a through hole is opened on the wall of the water-containing smoke discharge channel opposite to the end of the selective membrane column, the end of the selective membrane column is embedded in the through hole, and is pressed against the inner wall of the through hole by a pressing piece that bends the selective membrane.

[0007] The selective film is bent and pressed against the inner wall of the through hole by the pressing member, which not only improves the friction between the end of the selective film and the inner wall of the through hole and ensures the sealing of the end of the selective film, but also accelerates the formation of negative pressure in the selective film column.

[0008] In some embodiments of the present disclosure, the compression member is a hollow compression member, and an insulating clamping member is embedded in the inner cavity of the compression member near the exhaust port. The insulating clamping member clamps the heat transfer member, and a vent hole connecting the exhaust port and the inner cavity of the selective membrane column is provided on the insulating clamping member.

[0009] The heat-insulating clamping piece can not only effectively clamp the heat transfer piece, but also provide a heat-insulating effect for the heat transfer piece in the inner cavity of the selective membrane column, thereby ensuring the upper and lower heat exchange efficiency of the heat transfer piece.

[0010] In some embodiments of the present disclosure, the top end of the selective membrane column is connected to the exhaust port of the exhaust device through a bent exhaust channel in the exhaust box. The exhaust box is arranged on the outer wall of the water-containing smoke exhaust channel, and the top end of the heat transfer element extends into each branch of the exhaust channel.

[0011] The bent exhaust channel forms a deflection in the exhaust box, which can improve the heating effect of the passing gas, thereby improving the heat exchange effect of the heat transfer element.

[0012] In some embodiments of the present disclosure, an insulating partition plate is provided in the vacuum box, which divides the vacuum box into a first inner cavity and a second inner cavity. The first inner cavity is connected to the top of the selective membrane column, and the second inner cavity is connected to the vacuum port of the vacuum device. A connecting pipe connecting the first inner cavity and the second inner cavity is provided on the outer wall of the vacuum box, and the top of the heat transfer element passes through the first inner cavity and the insulating partition plate in sequence and extends into the second inner cavity.

[0013] The simple heat-insulating partition plate not only realizes deflection, but also reduces the heat loss of the heating gas in the second inner cavity, thereby improving the heating effect of the passing gas and thus improving the heat exchange effect of the heat transfer element.

[0014] In some embodiments of the present disclosure, the bottom end of the selective membrane column is connected to the water collection port of the water collection device outside the water collection tank, and the bottom end of the heat transfer element extends into the water collection tank.

[0015] Extending the bottom end of the heat transfer element into the water collecting tank can guide the condensed water droplets and prevent turbulent flow of the water droplets.

[0016] In some embodiments of the present disclosure, a porous support member for supporting the selective membrane is provided in the gap; the selective membrane is supported by the porous support member to maintain the shape of the selective membrane stable and ensure the permeation effect of the selective membrane.

[0017] In some embodiments of the present disclosure, the porous support member is a bucket-shaped structure; the bucket-shaped structure can facilitate the collection of condensed water droplets toward the center.

[0018] In some embodiments of the present disclosure, the selective membrane column is a cylinder formed by winding a selective membrane, and is easy to prepare.

[0019] In some embodiments of the present disclosure, the selective membrane is a sulfonated polyetherketone membrane coated with a water molecule selective coating on both sides; the captured water molecules have a high degree of cleanliness after condensation and can be directly reused.

[0020] The beneficial effects achieved by the utility model are as follows: the utility model can maintain a negative pressure in the inner cavity of the selective membrane column through the suction of the suction device, and the water vapor in the flue gas enters the selective membrane column under the action of osmotic pressure, and condenses through heat exchange with the outer wall of the heat transfer component. The condensed water droplets flow into the water collection device under the action of gravity, which effectively realizes the recovery of moisture in the flue gas and saves water resources. The flue gas after moisture removal greatly reduces the white smoke plume, making the flue gas emission more visually harmless, and the extracted hot air is convenient for the recovery and reuse of the waste heat of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front cross-sectional view of the flue gas water recovery device;

[0022] Figure 2 It is a side sectional view of the flue gas water recovery device;

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is a schematic diagram of the external structure of the flue gas water recovery device. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. It is obvious that the embodiments described are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0026] Unless otherwise specified, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0027] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0028] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0029] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0030] It should be noted that like symbols and letters refer to like items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] In order to solve the problem of water contained in the flue gas discharged during the preparation of lithium iron phosphate precursor, the present disclosure proposes a flue gas water recovery device.

[0032] Figure 1 This is a schematic diagram of an embodiment of the flue gas water recovery device of the present invention, which includes a plurality of hollow selective membrane columns 2. The selective membrane columns 2 are vertically installed in the water-containing flue gas discharge channel 1. A heat transfer element 3 is embedded in the inner cavity of the selective membrane column 2, and a gap is left between the heat transfer element 3 and the inner wall of the inner cavity of the selective membrane column 2. The top and bottom ends of the selective membrane column 2 are respectively connected to the exhaust port of the exhaust device and the water collection port of the water collection device.

[0033] It should be noted that the selective membrane column 2 is a hollow column made of a selective film, generally a cylinder, which is simple to prepare. The selective membrane is a sulfonated polyether ketone membrane coated with a water molecule selective coating on both sides. The selective membrane is selective for water molecules and does not act on other molecules. The captured water molecules have a high degree of cleanliness after condensation and can be directly reused.

[0034] In order to further fully remove moisture from the flue gas, there are multiple selective membrane columns 2. The best way is to ensure that the selective membrane columns 2 completely block the water-containing flue gas discharge channel 1. Specifically, multiple rows can be set, and each row of selective membrane columns 2 is close to each other, thereby blocking the water-containing flue gas discharge channel 1.

[0035] It should be noted that the top and bottom ends of the vertically mounted selective membrane column 2 are both fixed to the wall of the water-containing flue gas discharge channel 1. In some embodiments, a through hole is formed in the channel wall opposite the end of the selective membrane column 2, and the end of the selective membrane column 2 is inserted into the through hole. A pressing member that bends the selective membrane and presses it against the inner wall of the through hole is used. The use of the pressing member to bend the selective membrane and press it against the inner wall of the through hole not only increases the friction between the end of the selective membrane and the inner wall of the through hole, ensuring the sealing of the end of the selective membrane, but also accelerates the formation of negative pressure within the selective membrane column 2.

[0036] Taking the cylindrical selective membrane column 2 as an example, the pressing member adopts a fixed end tube 6. The specific example can be seen Figure 2 and 3A circular through hole is opened on the channel wall opposite to the end of the selective membrane column 2, the end of the selective membrane column 2 is embedded in the circular through hole, and the fixed end tube 6 is embedded in the circular through hole. The fixed end tube 6 and the inner wall of the circular through hole clamp the end of the selective membrane column, and the outer wall of the fixed end tube 6 is fixedly connected with multiple annular ridges at equal intervals, and the inner wall of the circular through hole is fixedly connected with a rubber sealing gasket matching the annular ridges. The annular ridges cooperate with the rubber sealing gasket, so that the fixed end tube 6 is more firmly inserted in the circular through hole. At the same time, the annular ridges can make the selective membrane at the contact position bend and press tightly, thereby improving the clamping friction and sealing performance.

[0037] Similar to the fixed end tube 6, in some embodiments, the compression member is hollow. A thermally insulating clamping member is embedded within the compression member's inner cavity near the air extraction port. This clamping member clamps the heat transfer member 3 and includes a vent 8 connecting the air extraction port to the inner cavity of the selective membrane column 2. The thermally insulating clamping member not only effectively holds the heat transfer member 3 but also provides thermal insulation within the inner cavity of the selective membrane column 2, ensuring efficient heat exchange between the upper and lower portions of the heat transfer member 3.

[0038] Or Figure 2 and 3 For example, the heat-insulating clamping part adopts a heat-insulating rubber insert 7, which is inserted and fixed into the fixed end tube 6 near the exhaust port, and the heat transfer part 3 is set through the center of the heat-insulating rubber insert 7. The heat transfer part 3 can be clamped and fixed by the heat-insulating rubber insert 7, and a plurality of ventilation holes 8 are provided in a circular array on the outer ring of the upper end of the heat-insulating rubber insert 7.

[0039] To recycle waste heat from flue gas, in some embodiments, an extraction box 4 is fixed to the outer wall of the water-containing flue gas discharge channel 1. The top end of the selective membrane column 2 is connected to the exhaust port of the exhaust device through a curved extraction channel within the extraction box 4. The top end of the heat transfer element 3 extends into each branch of the extraction channel. The curved extraction channel forms a deflection within the extraction box 4, which improves the heating effect on the passing gas, thereby enhancing the heat exchange efficiency of the heat transfer element 3.

[0040] There are many structures for forming a baffle by bending the exhaust channel. In some embodiments, see Figure 1A heat-insulating partition plate 9 is installed in the exhaust box 4. The heat-insulating partition plate 9 divides the exhaust box 4 into a first inner cavity and a second inner cavity (the first inner cavity is located at the lower part and the second inner cavity is located at the upper part in the figure). The first inner cavity is connected to the top end of the selective membrane column 2, and the second inner cavity is connected to the exhaust port of the exhaust device, specifically through the exhaust connection seat 11. A connecting pipe 10 is installed on the outer wall of the exhaust box 4 to connect the first inner cavity and the second inner cavity. Specifically, it is a U-shaped connecting pipe, so that the first inner cavity, the connecting pipe 10 and the second inner cavity form a U-shaped exhaust channel. The top end of the heat transfer element 3 passes through the first inner cavity and the heat-insulating partition plate 9 in turn and extends into the second inner cavity. The simple heat-insulating partition plate 9 not only realizes the deflection, but also reduces the heat loss of the heated gas in the second inner cavity, improves the heating effect of the passing gas, and thus improves the heat exchange effect of the heat transfer element 3.

[0041] In some embodiments, a water collecting box 5 is fixed on the outer wall of the water-containing flue gas discharge channel 1, and the bottom end of the selective membrane column 2 is connected to the water collecting port of the water collecting device through the water collecting box 5. The water collecting box 5 plays a confluence role, and the bottom end of the heat transfer element 3 is extended into the water collecting box 5, so that the heat transfer element 3 can guide the condensed water droplets to prevent turbulent flow of the water droplets.

[0042] It should be noted that the heat transfer element 3 utilizes a common gravity heat pipe, which operates by combining capillary circulation of the heat pipe with the gravity field to achieve heat transfer. Taking the cylindrical selective membrane column 2 as an example, the gravity heat pipe is generally distributed along the center of the cylindrical selective membrane column 2.

[0043] It should be noted that, in order to ensure the stability of the selective membrane, in some embodiments, Figure 3 The porous support members 12 are installed at equal intervals in the gap between the gravity heat pipe and the inner wall of the selective membrane column 2. The porous support members 12 support the selective membrane to keep the shape of the selective membrane stable and ensure the permeation effect of the selective membrane.

[0044] It should be noted that the shape of the porous support member 12 is determined according to the width of the gap. For example, if the gravity heat pipe is distributed along the center of the cylindrical selective membrane column 2, the porous support member 12 can be a porous support ring.

[0045] In order to facilitate the collection of condensed water droplets, in some embodiments, the porous support member 12 is designed as a bucket-shaped structure, which can collect the condensed water droplets toward the center, and the collected water flow can flow down through the drain holes 13 and gather in the water collecting box 5.

[0046] It should be noted that the water-containing smoke exhaust channel 1 can be a built-in channel in the existing smoke exhaust system or a non-built-in channel. When using the smoke water recovery device, the non-built-in channel needs to be connected to the original channel. The shape of the water-containing smoke exhaust channel 1 can be determined according to actual conditions. Figure 1 and 4 The hexagonal channel in the figure is just an example. The input and output ends of this channel are narrow, which is convenient for fully removing moisture from the flue gas.

[0047] The working principle of the flue gas water recovery device is as follows: when the device is in use, water-containing flue gas is fed in through the input end. When the water-containing flue gas passes through the selective membrane column 2, the exhaust device extracts air to keep the inner cavity of the selective membrane column 2 at a negative pressure. The water vapor in the flue gas enters the selective membrane column 2 under the action of osmotic pressure, and condenses through heat exchange with the outer wall of the gravity heat pipe. The condensed water droplets flow into the water collection device under the action of gravity for reuse.

[0048] The flue gas water recovery device can not only effectively recover the moisture in the flue gas and save water resources, but also greatly reduce the white smoke plume after removing the moisture from the flue gas, making the flue gas emission more visually harmless, and the extracted hot air facilitates the recovery and reuse of the flue gas waste heat.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A flue gas water recovery device, characterized in that: It includes several hollow selective membrane columns, which are vertically arranged in the water-containing smoke exhaust channel. A heat transfer element is embedded in the inner cavity of the selective membrane column, and a gap is left between the heat transfer element and the inner wall of the inner cavity of the selective membrane column. The top and bottom ends of the selective membrane column are respectively connected to the exhaust port of the exhaust device and the water collection port of the water collection device.

2. The flue gas water recovery device according to claim 1, characterized in that: A through hole is provided on the wall of the water-containing smoke exhaust passage opposite to the end of the selective membrane column. The end of the selective membrane column is embedded in the through hole and is pressed against the inner wall of the through hole by a pressing piece that bends the selective membrane.

3. The flue gas water recovery device according to claim 2, characterized in that: The compression piece is a hollow compression piece. A heat-insulating clamping piece is embedded in the inner cavity of the compression piece near the air extraction port. The heat-insulating clamping piece clamps the heat transfer piece. A vent hole connecting the air extraction port and the inner cavity of the selective membrane column is opened on the heat-insulating clamping piece.

4. The flue gas water recovery device according to claim 1, characterized in that: The top of the selective membrane column is connected to the exhaust port of the exhaust device through a bent exhaust channel in the exhaust box. The exhaust box is set on the outer wall of the water-containing smoke exhaust channel, and the top of the heat transfer element extends into each branch of the exhaust channel.

5. The flue gas water recovery device according to claim 4, characterized in that: An insulating partition plate is provided in the vacuum box, which divides the vacuum box into a first inner cavity and a second inner cavity. The first inner cavity is connected to the top end of the selective membrane column, and the second inner cavity is connected to the vacuum port of the vacuum device. A connecting pipe connecting the first inner cavity and the second inner cavity is provided on the outer wall of the vacuum box. The top end of the heat transfer element passes through the first inner cavity and the insulating partition plate in sequence and extends into the second inner cavity.

6. The flue gas water recovery device according to claim 1, characterized in that: The bottom end of the selective membrane column is connected to the water collecting port of the water collecting device outside the water collecting tank, and the bottom end of the heat transfer element extends into the water collecting tank.

7. The flue gas water recovery device according to claim 1, characterized in that: A porous support member for supporting the selective membrane is arranged in the gap.

8. The flue gas water recovery device according to claim 7, characterized in that: The porous support member is a bucket-shaped structure.

9. The flue gas water recovery device according to claim 1, characterized in that: The selective film column is a cylinder formed by winding the selective film.

10. The flue gas water recovery device according to any one of claims 1 to 9, characterized in that: The selective film is a sulfonated polyetherketone film coated with water molecule selective coating on both sides.

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