SST membrane saline water filter

Abstract

The utility model relates to an SST membrane saline water filter, including tank body, tank body cover, membrane tube, liquid inlet, liquid outlet and slag discharge port, tank body cover is movably installed in tank body top, a plurality of membrane tubes are fixed in tank body through tubesheet longitudinal direction, membrane tube shape is slender round tubular, membrane tube includes top end, middle section and fusion bottom end, the top end is fixed in the tank body through tubesheet longitudinal direction, the middle section is fixed in the tank body through tubesheet longitudinal direction, and the fusion bottom end is fixed in the tank body through tubesheet longitudinal direction. The middle section comprises two layers, one layer is an EPDM reinforced supporting layer, the other layer is a full-polytetrafluoroethylene film layer, the full-polytetrafluoroethylene film layer is arranged outside the EPDM reinforced supporting layer, and the quality of saline water is improved by improving the structure of the filter.

Description

Technical Field

[0001] This utility model relates to the technical field of caustic soda preparation, and in particular to an SST membrane brine filter. Background Technology

[0002] Brine refining is one of the main processes in caustic soda production. The service life and technical and economic indicators of the ion-exchange membrane electrolysis cells used in the chlor-alkali industry are closely related to the quality of the brine entering the cell. Brine quality directly affects power consumption and membrane lifespan. Improving brine quality has always been a goal pursued by the chlor-alkali industry. In brine membrane filtration processes, it has been found that the open upper clear liquid chamber of the membrane filter structure makes the filtered brine susceptible to environmental dust contamination. Furthermore, the membrane has a small specific surface area and insufficient flow rate, resulting in poor filtration performance that significantly impacts caustic soda production. Utility Model Content

[0003] The purpose of this invention is to provide an SST membrane brine filter to overcome the shortcomings of the prior art, thereby improving the quality of brine by modifying the filter structure.

[0004] According to the present invention, an SST membrane brine filter includes a tank and further includes:

[0005] A tank cover, which is movably installed on the top of the tank;

[0006] Several membrane tubes are longitudinally fixed inside the tank by a perforated plate. The membrane tubes are slender and cylindrical. Each membrane tube includes a top end, a middle section, and a bottom end. The middle section includes two layers: an EPDM reinforcing support layer and a polytetrafluoroethylene (PTFE) membrane layer. The PTFE membrane layer is placed outside the EPDM reinforcing support layer. The pore size of the membrane tube is 0.05-0.2 μm, and the porosity is 80%. An observation pipe and a ball valve are provided above the perforated plate.

[0007] The liquid inlet is located on one side wall of the tank and is connected to the high-level liquid inlet tank.

[0008] The liquid outlet is located on the other side wall of the tank and is connected to the filtered brine storage tank.

[0009] Slag discharge port, which is connected to the salt mud pit.

[0010] Preferably, the connection between the observation pipe and the ball valve is a threaded connection.

[0011] Preferably, the tank cover is hinged to the tank body, and a handle is provided on the tank cover.

[0012] Preferably, a slag discharge valve is installed on the pipeline from the slag discharge port to the salt mud pit.

[0013] Preferably, an inlet valve is provided on the pipeline from the high-level inlet tank to the inlet.

[0014] Preferably, the tank is cylindrical, and the diameter of the tank opening is 2100 mm.

[0015] Compared with the prior art, the advantages of this utility model are as follows:

[0016] First, by setting a tank cover that is movable at the top of the tank, the filtered brine can be prevented from being contaminated by environmental dust, thus reducing the quality of the brine. At the same time, the tank cover is made transparent so that the condition inside the brine filter can be observed, thereby facilitating monitoring and operation.

[0017] Secondly, several longitudinal membrane tubes are installed inside the tank. Each membrane tube consists of an EPDM reinforced support layer and a polytetrafluoroethylene (PTFE) membrane layer. The PTFE membrane layer is placed outside the EPDM reinforced support layer, which strengthens the membrane and provides high resistance to organic fouling. It also improves the effect of backwashing the salt mud layer on the outer wall of the membrane tube with filtered clear liquid.

[0018] Third, the membrane tube has a pore size of 0.05-0.2um and an open porosity of 80%. By setting a large specific surface area and a large flow rate, the SS in the filtered brine is ≤0.5mg / L, thus improving the quality of the brine.

[0019] Fourth, an observation pipe and ball valve are installed above the tube sheet. With this setup, when acid washing the membrane tube, it is only necessary to open the ball valve to observe the bubbling of hydrochloric acid in the tank from above, without having to disassemble the blind flange on the tube sheet, making the operation more convenient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an SST membrane brine filter proposed in this utility model.

[0021] Figure 2 This is a schematic diagram of the membrane tube structure proposed in this utility model.

[0022] Illustrations: 1. Tank body; 2. Tank cover; 3. Membrane tube; 4. Top; 5. Middle section; 5-1. EPDM reinforced support layer; 5-2. Polytetrafluoroethylene membrane layer; 6. Fusion bottom; 7. High-level inlet tank; 8. Filtered brine storage tank; 9. Salt mud pit; 10. Handle; 11. Sludge discharge valve; 12. Inlet valve; 13. Observation pipe; 14. Ball valve. Detailed Implementation

[0023] 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 further described in detail below with reference to the accompanying drawings and examples.

[0024] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical signal connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0027] Reference Figure 1-2 , Figure 1 This diagram illustrates the structure of an SST membrane brine filter according to one embodiment of the present invention. Figure 2This is a schematic diagram of the membrane tube structure in one embodiment of the present invention. The SST membrane brine filter provided in one embodiment of the present invention includes a tank body 1, a tank cover 2, membrane tubes 3, an inlet, an outlet, and a sludge discharge port. The tank cover 2 is movably installed on the top of the tank body 1. Several membrane tubes 3 are longitudinally fixed inside the tank body 1 by a perforated plate. The membrane tubes 3 are elongated circular tubes. Each membrane tube 3 includes a top end 4, a middle section 5, and a fused bottom end 6. The middle section 5 includes two layers, one of which is an EPDM reinforcing support layer 5-1. The tank consists of a PTFE membrane layer 5-2, which is positioned outside the EPDM reinforced support layer 5-1. The membrane tube 3 has a pore size of 0.05-0.2 μm and an open area ratio of 80%. An observation pipe 13 and a ball valve 14 are installed above the perforated plate. The inlet is located on one side wall of the tank and is connected to the high-level inlet tank 7. The outlet is located on the other side wall of the tank and is connected to the filtered brine storage tank 8. The sludge discharge port is connected to the salt mud pit 9. The brine in the high-level inlet tank 7 enters the tank 1 through the inlet. After being filtered by the membrane tube 3 inside the tank 1, the brine enters the filtered brine storage tank 8 through the outlet. The salt mud enters the salt mud pit 9 through the sludge discharge port. The membrane tube is configured with one layer of EPDM reinforcing support 5-1 and one layer of polytetrafluoroethylene (PTFE) membrane 5-2. The PTFE membrane 5-2 is positioned outside the EPDM reinforcing support 5-1, which improves the membrane tube's service life, allows for long-term operation under higher pressure, and enhances its resistance to fouling. It is also suitable for raw salt with high magnesium content, reducing the requirements for raw salt quality. Furthermore, it improves the backwashing effect of the filtered clarified liquid on the salt mud layer on the outer wall of the membrane tube. The membrane tube has a pore size of 0.05-0.2 μm and an open porosity of 80%. By setting a large specific surface area and high flow rate, the SS in the filtered brine is ≤0.5 mg / L, improving brine quality. An observation pipe 13 and a ball valve 14 are installed above the tube sheet. This configuration allows for easy observation of the hydrochloric acid bubbling inside the tank during acid washing by simply opening the ball valve 14 from above, eliminating the need to disassemble the blind flange on the tube sheet.

[0028] In one embodiment, the connection between the observation pipe and the ball valve is a threaded connection.

[0029] In one embodiment, the tank lid 2 is hinged to the tank 1, and a handle 10 is provided on the tank lid 2. The tank lid is a transparent lid to allow observation of the condition inside the tank for monitoring and operation.

[0030] In one embodiment, a slag discharge valve 11 is further provided on the pipeline from the slag discharge port to the salt mud pit 9. The discharge of salt mud from the tank can be controlled by providing the slag discharge valve 11.

[0031] In one embodiment, a liquid inlet valve 12 is further provided on the pipeline from the liquid inlet high-level tank 7 to the liquid inlet. The crude brine enters the filter through the liquid inlet valve 12 and permeates through the membrane tube.

[0032] In one embodiment, the tank 1 is further defined as cylindrical, with an opening diameter of 2100 mm.

[0033] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An SST membrane brine filter comprising a tank, characterized in that, Also include: The tank cover is movably mounted on the top of the tank body; Membrane tube, several membrane tubes are fixed in the tank body by the flower plate longitudinally, the shape of the membrane tube is elongated circular tube, the membrane tube includes top end, middle section and fusion bottom end, the middle section includes two layers, one is EPDM reinforced support layer, one is full polytetrafluoroethylene film layer, the full polytetrafluoroethylene film layer is arranged outside the EPDM reinforced support layer, the aperture size of the membrane tube is 0.05-0.2um, the opening rate is 80%, the flower plate is provided with an observation pipeline and a ball valve above the flower plate; Liquid inlet, the liquid inlet is arranged on one side wall of the tank body, and the liquid inlet is connected with the liquid inlet high tank; Liquid outlet, the liquid outlet is arranged on the other side wall of the tank body, and the liquid outlet is connected with the filtered brine storage tank; Deslagging port, the deslagging port is connected with the salt mud pit.

2. The SST membrane brine filter of claim 1, wherein, The connection mode between the observation pipeline and the ball valve is screw connection.

3. The SST membrane brine filter of claim 1, wherein, The tank cover is hingedly connected with the tank body, and a handle is arranged on the tank cover.

4. The SST membrane brine filter of claim 1, wherein, A deslagging valve is arranged on the pipeline from the deslagging port to the salt mud pit.

5. The SST membrane brine filter of claim 1, wherein, A liquid inlet valve is arranged on the pipeline from the liquid inlet high tank to the liquid inlet.

6. The SST membrane brine filter of claim 1, wherein, The tank body is cylindrical, and the diameter of the tank opening is 2100mm.

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