Industrial roll type wet film element drying device

Abstract

The utility model discloses an industrial roll type wet membrane element drying device which comprises a membrane element drying container, an air blower, a heater, an exhaust fan, an air inlet guide pipe, a membrane element and a plurality of pipelines. A permeation side air inlet and a filtration side air outlet are formed in the membrane element drying container; the inner diameter of the air inlet guide pipe is smaller than that of the central pipe; air outlet holes are uniformly distributed in a pipe body; an air supply outlet of the air blower is sequentially connected with the heater and an air inlet of the air inlet guide pipe through pipelines, and an air outlet of the filtering side is connected with an air suction opening of the exhaust fan through a pipeline. According to the utility model, not only can water on the surface of the membrane element and on the membrane filtering side be removed, but also water on the membrane permeating side can be removed, so that the drying efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of roll-type membrane element manufacturing, and more specifically to an industrial roll-type wet membrane element drying device. Background Art

[0002] Reverse osmosis or nanofiltration membrane is a commonly used technology for deep treatment of sewage and wastewater, and is often used in the fields of zero wastewater discharge, municipal sewage treatment, tap water quality improvement, material concentration and separation, etc. Under the action of pressure higher than the osmotic pressure of the wastewater solution, the reverse osmosis membrane intercepts salt, small molecules, microorganisms and other substances in the sewage and wastewater.

[0003] The reverse osmosis membrane is a dry membrane before being assembled into a membrane element. The reverse osmosis membrane element needs to be tested for permeability before leaving the factory. The membrane element that passes the test is a wet membrane element. The wet membrane element needs to be filled with protective liquid, which increases the cost and inconvenience for storage and transportation. At the same time, in order to avoid the membrane element being stored for too long and the anti-corrosion performance of the protective liquid failing, it is necessary to replace the new protective liquid regularly and in time, otherwise it is easy to cause the membrane surface to mold and deteriorate, which further increases the storage cost.

[0004] In order to facilitate storage and transportation and prevent the wet membrane elements from possible mold and deterioration, it is necessary to remove the moisture in the wet membrane and dry it again to a dry membrane state. From another perspective, due to pollution, oxidation and other reasons during use, the permeability of the reverse osmosis membrane element will be irreversibly attenuated, and to a certain extent it can only be disposed of. Since the wet membrane element contains more water, about 30% of the total weight, it undoubtedly increases the cost of solid waste treatment. Drying the wet membrane element helps to reduce the cost of processing discarded membrane elements.

[0005] Therefore, it is necessary to re-dehydrate the wet membrane element. Before dehydrating and drying the wet membrane element, it is necessary to soak the pore retaining agent first. Secondly, the dehydration and drying of the wet membrane element must not only ensure that the moisture on the element surface and the membrane filtration side is removed, but also the moisture on the membrane permeation side must be removed.

[0006] However, in the prior art, it is impossible to ensure the ideal effect of removing moisture from the permeable side of the membrane while ensuring the integrity of the membrane element. For example, in a household reverse osmosis membrane element dryer, publication number: CN204006993U, the hot air flow only passes through the filter side and the central tube of the membrane element, and does not pass through the permeable side of the membrane element. Even if the water evaporates under the action of thermal radiation, it cannot be discharged from the permeable side and still accumulates on the permeable side, resulting in a reduced drying effect. For example, a reverse osmosis membrane element wet film dehumidifier and dehumidification process, publication number: CN105571272B, the possibility of using a gas pressure difference dehumidifier to achieve this is low, and thorough drying still requires high-temperature heating, and the cost is relatively high. For example, a dehydration method for a spiral membrane element, publication number: CN115485056A, the centrifugal process easily causes dislocation and sliding of the water inlet channel network, resulting in damage to the functional layer on the membrane filtration side.

[0007] In order to ensure that the moisture on the element surface, the membrane filtration side and the membrane permeation side is removed, it is necessary to provide an industrial roll-type wet membrane element drying device. Utility Model Content

[0008] The purpose of the utility model is to provide an industrial roll-type wet film element drying device to overcome the above-mentioned defects in the prior art.

[0009] The technical scheme for realizing the purpose of the utility model is: an industrial rolled wet membrane element drying device, comprising a membrane element drying container, a blower, a heater, an exhaust fan, an air inlet duct, a membrane element and a pipeline, wherein the membrane element is a common rolled permeable membrane or filter membrane, which becomes a wet membrane after detection or use, and comprises a filter membrane and a central tube with evenly distributed water collection holes, wherein the membrane element comprises a filter membrane and a central tube with evenly distributed water collection holes, wherein the membrane element drying container is provided with a permeation side air inlet and a filtration side air outlet, wherein the inner diameter of the air inlet duct is smaller than the inner diameter of the central tube and the tube body is evenly distributed with air outlet holes; wherein the air supply port of the blower is sequentially connected with the heater and the air inlet port of the air inlet duct through a pipeline, and the air outlet on the filtration side is connected with the air suction port of the exhaust fan through a pipeline;

[0010] During drying, when the membrane element is placed in the membrane element drying container, the air inlet conduit is inserted into the central tube through the air inlet on the permeation side. After the airflow enters the central tube, a part of it will pass through the filter membrane to take away the moisture, and the airflow carrying moisture will be extracted from the air outlet on the filter side through the exhaust fan.

[0011] As a preferred embodiment, a sealing ring is installed at the head of the air intake duct. When in use, when the air intake duct is inserted into the central tube, the sealing ring will seal the other end of the central tube, and the air flow can only flow out through the filter membrane, so that the filter membrane is fully dried.

[0012] As a preferred embodiment, the membrane element drying container is a hollow cylinder, and the membrane element drying container is also provided with a permeation side air outlet and a filtration side air inlet, the permeation side air inlet and the permeation side air outlet are symmetrically arranged on the two end surfaces of the membrane element drying container, the filtration side air inlet and the filtration side air outlet are arranged on both sides of the side wall of the membrane element drying container, when the membrane element is placed in the membrane element drying container, the two ends of the central tube are tightly fitted with the permeation side air inlet and the permeation side air outlet respectively; the permeation side air outlet is connected to the exhaust fan through a pipeline, and the filtration side air inlet is connected to the heater through a pipeline.

[0013] As a preferred embodiment, a gas-liquid separator is further provided, wherein one end of the gas-liquid separator is connected to both the permeation side air outlet and the filtration side air outlet through a pipeline, and the other end is connected to the exhaust fan.

[0014] As a preferred embodiment, valves are respectively provided on the pipes connecting the heater with the permeation side air inlet and the filtration side air inlet, and valves are respectively provided on the pipes connecting the gas-liquid separator with the permeation side air outlet and the filtration side air outlet.

[0015] As a preferred embodiment, the length of the air inlet duct is half the length of the central tube.

[0016] As a preferred embodiment, the sealing ring is a Y-shaped sealing ring.

[0017] As a preferred embodiment, the air outlet of the exhaust fan is connected to the air inlet duct of the blower.

[0018] As a preferred embodiment, the membrane element needs to be placed in a pore retaining agent tank before being placed in a drying device and fully soaked for more than 1 hour so that the filtration side and the permeate side flow channels of the membrane element are filled with the pore retaining agent solution.

[0019] As a preferred embodiment, the temperature of the heater is set between 40 and 50°C.

[0020] By adopting the above technical solution, the utility model has the following beneficial effects:

[0021] (1) The utility model is an industrial rolled wet membrane element drying device, which can remove moisture not only on the membrane element surface and the membrane filtration side, but also on the membrane permeation side by inserting an air inlet duct into the membrane element center tube, thereby achieving a better drying effect.

[0022] (2) The utility model is an industrial rolled wet membrane element drying device. In order to further improve the drying effect of the inner side of the filter membrane, a sealing ring is arranged at the head of the air inlet duct. The sealing ring will seal the other end of the central tube. The air flow can only flow out through the filter membrane, so that the filter membrane is fully dried.

[0023] (3) The utility model is an industrial rolled wet membrane element drying device. In order to further improve the drying efficiency, the membrane element drying container is provided with two pairs of air inlets and outlets. When in use, the filter side is first dried quickly through the filter side air inlet and the filter side air outlet, and then the permeate side moisture is dried through the air inlet duct. The drying time is shortened while ensuring the drying quality, thereby improving the drying efficiency.

[0024] (4) The utility model is an industrial roll-type wet membrane element drying device, which connects the air outlet of the exhaust fan with the air inlet duct of the blower and adds a gas-liquid separator, so that the dry gas can be recycled to achieve a better drying effect.

[0025] (5) The utility model is an industrial rolled wet film element drying device, which can effectively control the order and process of the inlet and outlet gases by arranging valves on the inlet and outlet gas pipes, so as to facilitate industrial use.

[0026] (6) The utility model is an industrial rolled wet membrane element drying device, which sets the air inlet duct to half the length of the central tube, forcing hot air to enter the water permeable side and be discharged from the other half of the water collecting holes of the central tube, so that the evaporated water vapor on the water permeable side is directly taken away, thereby improving the drying efficiency and saving the device cost.

[0027] (7) The utility model provides an industrial roll-type wet film element drying device, which has a normal pressure equal to the wind pressure at each point by setting a Y-shaped sealing ring, so that the bottom of the lip ring will be compressed axially and the lip will be compressed circumferentially, the contact with the sealing surface will become wider, and the contact stress will increase, so that the sealing effect will be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of an industrial roll-type wet membrane element drying device.

[0030] Figure 2 Schematic diagram of the hot air path through the air intake duct of an industrial roll-type wet membrane element drying device Figure 1 .

[0031] Figure 3 Schematic diagram of the hot air path through the air intake duct of an industrial roll-type wet membrane element drying device Figure 2 .

[0032] The numbers in the attached drawings are: 1, membrane element drying container; 1-1, permeation side air inlet; 1-2, permeation side air outlet; 1-3, filtration side air inlet; 1-4, filtration side air outlet; 2, blower; 3, heater; 4, exhaust fan; 5, gas-liquid separator; 6-1, permeation side air inlet valve; 6-2, permeation side air outlet valve; 6-3, filtration side air inlet valve; 6-4, filtration side air outlet valve; 7, air inlet duct; 7-1, air outlet hole; 7-2, sealing ring; 8, membrane element; 8-1, center tube; 8-2, water collection hole; 8-3 filter membrane. DETAILED DESCRIPTION

[0033] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the embodiments of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present utility model.

[0038] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected", and "connected" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the scope of protection of the utility model.

[0039] See Figure 1 An industrial rolled wet membrane element drying device includes a membrane element drying container 1, a blower 2, a heater 3, an exhaust fan 4, a gas-liquid separator 5, an air inlet duct 7, a membrane element 8 and a pipeline. The membrane element 8 is a common rolled permeable membrane or filter membrane, which becomes a wet membrane after detection or use, and includes a filter membrane 8-3 and a central tube 8-1 with evenly distributed water collection holes 8-2. The membrane element drying container 1 is a hollow cylinder. The membrane element drying container 1 is provided with a permeate side air inlet 1-1, a permeate side air outlet 1-2, a filtration side air inlet 1-3 and a filtration side air outlet 1-4. The permeate side air inlet 1-1 and the permeate side air outlet 1-2 are symmetrically arranged on the two end faces of the membrane element drying container 1, and the filtration side air inlet 1-3 and the filtration side air outlet 1-4 are arranged on both sides of the side wall of the membrane element drying container 1. When the membrane element 8 is placed in the membrane element drying container 1, the two ends of the central tube 8-1 are respectively connected to the permeate side. The side air inlet 1-1 and the permeation side air outlet 1-2 fit closely; the inner diameter of the air inlet duct 7 is smaller than the inner diameter of the central tube 8-1 and the air outlet holes 7-1 are evenly distributed on the tube body; the air supply port of the blower 2 is sequentially connected with the heater 3 and the air inlet duct 7 through pipelines, the permeation side air outlet 1-2 and the filter side air outlet 1-4 are sequentially connected with the gas-liquid separator 5 and the air suction port of the exhaust fan 4 through pipelines, the filter side air inlet 1-3 is connected with the heater 3 through a pipeline, and the air outlet of the exhaust fan 4 is connected with the air inlet pipeline of the blower 2. The permeation side air inlet 1-1, the permeation side air outlet 1-2, the filter side air inlet 1-3 and the filter side air outlet 1-4 are respectively provided with a permeation side air inlet valve 6-1, a permeation side air outlet valve 6-2, a filter side air inlet valve 6-3 and a filter side air outlet valve 6-4. The length of the air inlet duct 7 is half the length of the central tube and a Y-shaped sealing ring 7-2 is installed at the head.

[0040] See Figure 2 and Figure 3 , the drying steps are as follows:

[0041] (1) First, place the membrane element 8 in the pore retaining agent tank and soak it for more than 1 hour, so that the pore retaining agent solution is filled in the filter side and the permeate side of the membrane element. The concentration of the pore retaining agent is 3%-8%, the temperature is 25-45°C, and the pore retaining agent is propylene glycol, glycerol, surfactant, calcium chloride and other substances. Take out the membrane element 8 and place it vertically to drain for more than 1 hour.

[0042] (2) The membrane element 8 soaked in the pore retaining agent is transferred to the cylindrical membrane element drying container 1, and the permeate side air inlet 1-1 and the permeate side air outlet 1-2 are directly connected to the central conduit 8-1 and fit tightly; the air inlet conduit 7 is inserted into the central tube 8-1 of the membrane element, and the air outlet holes 7-1 are evenly distributed on the body of the air inlet conduit 7. The head of the air inlet conduit 7 is equipped with a Y-shaped sealing ring 7-2. The central tube 8-1 where the Y-shaped sealing ring is inserted into the stop position does not have a water collection hole 8-2.

[0043] (3) First, open the filter side air inlet valve 6-3 and the filter side air outlet valve 6-4, turn on the power, start the blower 2 and the heater 3, the heat source of the heater 3 is electric heating or steam heating. At the same time, start the exhaust fan 4 on the air outlet side, the exhaust fan 4 extracts the hot air on the filter side of the membrane element 8, and removes the residual liquid through the gas-liquid separator 5, the gas circulates back to the air inlet of the blower 2, and continuously circulates inside the membrane element to take out the evaporated water vapor on the membrane surface. The air volume of the blower can be adjusted to the maximum gear, and the heater temperature is 40-50℃. This step is circulated for 0.5-1h, then the exhaust port of the exhaust fan 4 and the air inlet of the blower 2 are opened, the heating is stopped, and the circulation is continued until the temperature drops below 40℃, the operation is stopped, and the filter side air inlet valve 6-3 and the filter side air outlet valve 6-4 are closed.

[0044] (4) Open the air inlet valve 6-1 on the permeate side and the air outlet valve 6-2 on the permeate side, start the blower 2, the exhaust fan 4 and the heater 3, adjust the air volume to 20-30% of the maximum air volume, the air pressure does not exceed 20kPa, and the temperature is set to 40-45°C. The hot air is introduced into the center tube 8-1 through the air inlet duct 7 connected to the permeate side air inlet 1-1, and then enters the water permeable side of the membrane element through the water collection hole of the center tube 8-1. The end of the air inlet duct 7 is equipped with a Y-ring 7-2. Under the wind pressure, each point of the Y-ring that originally slightly contacts the center tube has a normal pressure equal to the wind pressure, so the bottom of the lip ring will be compressed axially, and the lip will be compressed circumferentially, and the contact with the sealing surface will become wider. At the same time, the contact stress increases, which plays a sealing role. Since the hot air enters the water permeable side of the membrane element through the air inlet duct 7, it is no longer directly discharged through the center tube 8-1. The hot air passes through the water permeable side of the membrane element 8 and is then discharged from the water collecting hole 8-2 of the other half of the central tube 8-1, thereby taking out the water vapor evaporated under the heat radiation. This step is circulated for 1h-2h.

[0045] (5) Weigh the membrane element 8 and compare it with the normal dry membrane element to determine whether the drying has reached the end point. The weight data is shown in the following table:

[0046] Membrane elements Dry film weight kg Wet film weight kg Weight after dehydration kg 8040 membrane element 1 10.85 14.12 10.96 8040 membrane element 2 10.83 14.15 10.95 8040 membrane element 3 10.86 14.20 11.02

[0047] In this embodiment, the wet membrane element is soaked in a pore preserving agent before drying, thereby avoiding flux loss caused by membrane pore collapse during the drying process; in order to solve the problem that hot air cannot effectively enter the water-permeable side of the membrane element and remove the evaporated water vapor in time, an air inlet duct is introduced, and a Y-shaped ring is installed at the head of the duct, and holes are evenly opened around the duct for hot air. Under the action of wind pressure, the Y-shaped ring seals the central tube of the membrane element from the middle position, forcing the hot air to enter the water-permeable side and be discharged from the other half of the water collection holes of the central tube, so that the evaporated water vapor on the water-permeable side is directly taken away, thereby improving the drying efficiency and ensuring the drying effect.

[0048] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An industrial roll-type wet membrane element drying device, characterized in that: The invention comprises a membrane element drying container (1), a blower (2), a heater (3), an exhaust fan (4), an air inlet duct (7), a membrane element (8) and a plurality of pipelines. The membrane element (8) comprises a filter membrane (8-3) and a central tube (8-1) with evenly distributed water collection holes (8-2). The membrane element drying container (1) is provided with an air inlet (1-1) on the permeation side and an air outlet (1-4) on the filtration side. The inner diameter of the air inlet duct (7) is smaller than the inner diameter of the central tube (8-1), and the air outlet holes (7-1) are evenly distributed on the tube body. The air supply port of the blower (2) is sequentially connected to the air inlet of the heater (3) and the air inlet duct (7) through pipelines. The air outlet (1-4) on the filtration side is connected to the air suction port of the exhaust fan (4) through pipelines. During drying, the membrane element (8) is placed in the membrane element drying container (1), and the air inlet conduit (7) is inserted into the central tube (8-1) through the permeation side air inlet (1-1). After the airflow enters the central tube (8-1), a portion of the airflow will pass through the filter membrane (8-3) to take away the moisture, and the airflow carrying the moisture is extracted from the filter side air outlet (1-4) through the exhaust fan (4).

2. The industrial roll-type wet film element drying device according to claim 1 is characterized in that: A sealing ring (7-2) is installed at the head of the air intake duct (7).

3. The industrial roll-type wet film element drying device according to claim 2 is characterized in that: The membrane element drying container (1) is a hollow cylindrical body. The membrane element drying container (1) is also provided with a permeation side air outlet (1-2) and a filtration side air inlet (1-3). The permeation side air inlet (1-1) and the permeation side air outlet (1-2) are symmetrically arranged at the two end surfaces of the membrane element drying container (1). The filtration side air inlet (1-3) and the filtration side air outlet (1-4) are arranged on both sides of the side wall of the membrane element drying container (1). When the membrane element (8) is placed in the membrane element drying container (1), the two ends of the central tube (8-1) are tightly fitted with the permeation side air inlet (1-1) and the permeation side air outlet (1-2) respectively. The permeation side air outlet (1-2) is connected to the exhaust fan (4) through a pipeline, and the filtration side air inlet (1-3) is connected to the heater (3) through a pipeline.

4. The industrial roll-type wet film element drying device according to claim 3 is characterized in that: A gas-liquid separator (5) is also provided. The gas-liquid separator (5) is connected to the permeation side gas outlet (1-2) and the filtration side gas outlet (1-4) at one end of a pipeline, and is connected to the exhaust fan (4) at the other end.

5. The industrial roll-type wet film element drying device according to claim 4 is characterized in that: Valves are respectively provided on the pipes connecting the heater (3) and the permeation side air inlet (1-1) and the filtration side air inlet (1-3); valves are respectively provided on the pipes connecting the gas-liquid separator (5) and the permeation side air outlet (1-2) and the filtration side air outlet (1-4).

6. The industrial roll-type wet film element drying device according to claim 3 is characterized in that: The length of the air intake duct (7) is half the length of the central tube (8-1).

7. The industrial roll-type wet film element drying device according to claim 6 is characterized in that: The sealing ring (7-2) is a Y-shaped sealing ring.

8. The industrial roll-type wet film element drying device according to claim 4 is characterized in that: The air outlet of the exhaust fan (4) is connected to the air inlet duct of the blower (2).

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