A composite filter element for condensate polishing with ion exchange function

Abstract

The utility model discloses a kind of condensate water fine treatment composite filter core with ion exchange function, inner filter layer, ion exchange layer, outer filter layer are wound in turn outside central filter tube, outer filter layer is wound from ordinary fiber bundle, ion exchange layer is wound from ion exchange fiber bundle, ion exchange fiber bundle is woven from ion exchange fiber containing ion exchange group, inner filter layer is wound from ordinary fiber bundle or is composed of fiber filter cloth, condensate water passes through outer filter layer, ion exchange layer and inner filter layer in turn, then enter the central filter tube of one end closed other end communication screw pipe through the hole on the wall of central filter tube. The filter core disclosed by the utility model has the functions of removing iron, suspended solids and salt. The filter core is replaced every half year, which can save equipment investment by more than 60%. The ion exchange speed of the filter core is more than 10 times higher than the resin exchange speed. The filter core has small water resistance, and can be used for high-speed condensate water treatment.

Description

Technical Field

[0001] This utility model belongs to the field of industrial water treatment technology, specifically relating to a composite filter element for condensate purification with ion exchange function. Background Technology

[0002] In the power, steel metallurgy, and petrochemical industries, the fine treatment of condensate and process cooling water employs a combination of processes such as iron removal filters, pre-filters, powder resin coated filters, high-speed cation exchange beds, and high-speed mixed beds, along with supporting acid-base regeneration, resin storage, and wastewater treatment systems. The entire treatment system is quite large, making it difficult to arrange in the already congested main plant building, resulting in numerous pieces of equipment and increased investment. The resin particles used in condensate fine treatment require high strength and high particle size uniformity, but their small specific surface area limits their working exchange capacity, leading to low utilization and high acid-base regeneration operating costs. Summary of the Invention

[0003] To address the issues of large size, numerous devices, and high investment in condensate polishing systems, this invention provides a composite filter element for condensate polishing with ion exchange function. It also functions to remove iron, suspended solids, and salt. When used in condensate polishing processes, it can eliminate the need for high-speed cation exchange filters, high-speed mixed bed filters, powder resin covering filters, and the associated acid-base regeneration, resin storage, and wastewater treatment systems.

[0004] The purpose of this utility model is achieved in the following manner: a composite filter cartridge for condensate purification with ion exchange function, comprising a central filter tube, a filter layer wound around the central filter tube, the filter layer being, from the inside out, an inner filter layer, an ion exchange layer, and an outer filter layer, the outer filter layer being made of ordinary fiber bundles wound together, the ion exchange layer being made of ion exchange fiber bundles wound together, the ion exchange fiber bundles being woven from ion exchange fibers containing ion exchange groups, the inner filter layer being made of ordinary fiber bundles wound together or composed of fiber filter cloth, the condensate passing through the outer filter layer, the ion exchange layer, and the inner filter layer in sequence, and then entering the central filter tube through holes in the wall of the central filter tube, one end of the central filter tube being closed, and the other end being connected to a threaded pipe serving as an outlet.

[0005] A lower baffle is installed on the pipe wall at the connection between the central filter tube and the threaded tube, and an upper baffle is installed at the other end of the central filter tube. The upper baffle seals the end of the central filter tube, and the upper and lower baffles fix and limit the two ends of the filter layer.

[0006] The upper baffle is connected to a fixing screw, and an upper end cover is fitted on the fixing screw. An upper washer is also provided between the upper end cover and the upper baffle. An end cover nut for locking the upper end cover is also provided on the fixing screw. A lower end cover is fitted on the threaded pipe, and a lower washer is also provided between the lower end cover and the lower baffle. A locking nut for locking the lower end cover is also fitted on the threaded pipe.

[0007] The ion exchange fibers include one or more of the following: strong acid cation exchange fibers, weak acid cation exchange fibers, strong basic anion exchange fibers, weak basic anion exchange fibers, and chelating fibers.

[0008] The outer filter layer is 2-3 mm thick, the ion exchange layer is 15-20 mm thick, and the inner filter layer is 0.5-1 mm thick.

[0009] Compared to existing technologies, the filter element disclosed in this utility model combines the functions of iron removal, suspended solids removal, and desalination. When used in condensate polishing processes, it eliminates the need for high-speed cation exchange filters, high-speed mixed bed filters, powder resin coated filters, and the associated acid / alkali regeneration, resin storage, and wastewater treatment systems. The filter element only needs to be replaced every six months, thus saving over 60% on equipment investment. The ion exchange rate of the filter element is more than 10 times higher than that of the resin. The filter element also exhibits low water flow resistance, making it suitable for high-speed condensate treatment. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure 2 This is a cross-sectional view of the present invention.

[0012] Figure 3 This is a schematic diagram of the structure of the central filter tube of this utility model.

[0013] In the diagram: central filter tube 1, threaded tube 10, upper baffle 11, lower baffle 12, upper end cap 13, upper gasket 14, end cap nut 15, lower end cap 16, lower gasket 17, locking nut 18, fixing screw 19, filter layer 2, inner filter layer 21, ion exchange layer 22, outer filter layer 23. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various modifications or alterations to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0015] like Figures 1-3As shown, a composite filter cartridge for condensate polishing with ion exchange function includes a central filter tube 1, with a filter layer 2 wound around the central filter tube 1. The filter layer 2, from the inside out, consists of an inner filter layer 21, an ion exchange layer 22, and an outer filter layer 23. The outer filter layer 23 is made of ordinary fiber bundles wound together, and its preferred thickness is 2-3 mm. Its function is to prevent suspended particulate matter in the water from entering the ion exchange layer 22 and causing pollution, thus providing protection. The ion exchange layer 22 is made of ion exchange fiber bundles wound together, and the ion exchange fiber bundles are woven from ion exchange fibers containing ion exchange groups. The preferred thickness of the ion exchange layer 22 is... The ion exchange layer 22 is a functional layer of the composite filter element, which is used to exchange ions and remove salt from the water. The inner filter layer 21 is made of ordinary fiber bundles or fiber filter cloth. The preferred thickness of the inner filter layer 21 is 0.5-1mm. It mainly prevents the fine fibers of the ion exchange layer from falling into the central filter tube 1. The condensate passes through the outer filter layer 23, the ion exchange layer 22 and the inner filter layer 21 in sequence, and then enters the central filter tube 1 through the holes on the tube wall. One end of the central filter tube 1 is closed and the other end is connected to the threaded pipe 10, which serves as the outlet. The threaded pipe 10 is used to fix the lower end of the filter element to the filter element connector inside the filter.

[0016] In a further preferred embodiment, a lower baffle 12 is provided on the wall of the pipe at the connection between the central filter tube 1 and the threaded pipe 10, and an upper baffle 11 is provided at the other end of the central filter tube 1. The upper baffle 11 closes the upper end of the central filter tube 1, and the upper baffle 11 and the lower baffle 12 fix and limit the two ends of the filter layer.

[0017] In a further preferred embodiment, a fixing screw 19 is connected to the upper part of the upper baffle 11. The fixing screw 19 is used to fix the entire filter element from the top. An upper end cap 13 is fitted onto the fixing screw 19, and an upper gasket 14 is also provided between the upper end cap 13 and the upper baffle 11. An end cap nut 15 for locking the upper end cap is also provided on the fixing screw 19. A lower end cap 16 is fitted onto the threaded tube 10, and a lower gasket 17 is also provided between the lower end cap 16 and the lower baffle 12. A locking nut 18 for locking the lower end cap 16 is also fitted onto the threaded tube 10. The fixing screw 19, upper baffle 11, central filter tube 1, lower baffle 12, and threaded tube 10 are welded together to form a whole, preferably made of stainless steel.

[0018] The ion exchange fibers include one or more of the following: strongly acidic cation exchange fibers, weakly acidic cation exchange fibers, strongly basic anion exchange fibers, weakly basic anion exchange fibers, and chelating fibers. The base material of the ion exchange fibers is mainly one or more of the following: polyolefins, polyacrylonitrile, polyvinyl alcohol, polyvinyl chloride, and vinyl chloride-acrylonitrile copolymers.

[0019] The base material for ordinary fiber bundles or fiber filter cloths is polypropylene or natural cotton.

[0020] During filter element manufacturing, the central filter tube 1 is manufactured first. Then, the inner filter layer 21, ion exchange layer 22, and outer filter layer 23 are wound sequentially around the outside of the central filter tube 1 between the upper baffle 11 and the lower baffle 12 according to the predetermined layer thickness. Next, the upper gasket 14 is put on the upper baffle 11 and the outer filter layer 23 of the central filter tube 1. Then, the upper end cap 13 is put on the upper gasket 14 through the fixing screw 19. The end cap nut 15 is put on the fixing screw 19 and tightened to fix the upper end cap 13. Similarly, the lower gasket 17 is put on the lower baffle 12 and the outer filter layer 23 of the central filter tube 1. Then, the lower end cap 16 is put on the lower gasket 17 through the threaded tube 10. The locking nut 18 is put on the threaded tube 10 and tightened to fix the lower end cap 16.

[0021] The filter element disclosed in this utility model combines the functions of iron removal, suspended solids removal, and desalination. When used in condensate polishing processes, it eliminates the need for high-speed cation exchange filters, high-speed mixed bed filters, powder resin coated filters, and the associated acid / alkali regeneration, resin storage, and wastewater treatment systems. The filter element only needs to be replaced every six months, thus saving over 60% on equipment investment. The ion exchange rate of the filter element is more than 10 times higher than that of the resin. The filter element has low water flow resistance and can adapt to high-speed condensate treatment.

[0022] Example 1

[0023] The ion exchange layer 22 uses two types of ion exchange fibers: strongly acidic cation exchange fibers and strongly basic anion exchange fibers, in a ratio of 2:1. The ion exchange layer 22 is 15 mm thick, with an inner diameter of 30 mm, an outer diameter of 70 mm, and a length of 254.4 mm. The water flow rate is 1 m³ / s. 3 / h, influent conductivity 2μS / cm, water temperature 42℃, operating pressure 3.7MPa.

[0024] Operational data table: Backwash once every 15 days

[0025]

[0026] Example 2

[0027] The only difference from Example 1 is that the ratio of strong acid cation exchange fibers to strong base anion exchange fibers in ion exchange layer 22 is 1:1, and all other aspects are the same as in Example 1.

[0028]

[0029] As can be seen from the above examples, when the ratio of strongly acidic cation exchange fibers to strongly basic anion exchange fibers is 2:1 or 1:1, the desalination function of the filter cartridge can meet the average service life of 6 months (240 days), the effluent meets the requirements, and the filter cartridge replacement cycle of 6 months also basically meets the requirements of maintenance cycle and economic operation. Especially in some small condensate polishing systems, replacing the filter cartridge is more cost-effective than increasing the investment. In addition, in demineralized water treatment systems with lower effluent requirements, such as effluent water requirements of less than 1 μS / cm, the filter cartridge operating cycle is even longer, making it more economical.

[0030] The ion exchange layer 22 in the above embodiments is made of a composite blend of cation exchange fibers and anion exchange fibers. In practical applications, the composite ratio can be adjusted as needed, or cation exchange fibers or anion exchange fibers can be used alone as the ion exchange layer 22 to remove certain cations or anions in a targeted manner.

[0031] Furthermore, increasing the thickness of the ion exchange layer 22 in the filter element increases the volume of the ion exchange layer, which proportionally extends the life of the filter element.

[0032] The filter element of this invention has a length of 254.4 mm, or 10" length. The length of the filter element can be extended to the standard length of 40" or 60" to proportionally increase the water treatment capacity of the filter element.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A composite filter cartridge for condensate polishing with ion exchange function, comprising a central filter tube (1) and a filter layer (2) wrapped around the central filter tube (1), characterized in that: The filter layer (2) consists of an inner filter layer (21), an ion exchange layer (22), and an outer filter layer (23) from the inside out. The outer filter layer (23) is made of ordinary fiber bundles wound together. The ion exchange layer (22) is made of ion exchange fiber bundles wound together. The ion exchange fiber bundles are woven from ion exchange fibers containing ion exchange groups. The inner filter layer (21) is made of ordinary fiber bundles wound together or composed of fiber filter cloth. The condensate passes through the outer filter layer (23), the ion exchange layer (22), and the inner filter layer (21) in sequence, and then enters the central filter tube (1) through the holes on the tube wall. One end of the central filter tube (1) is closed, and the other end is connected to the threaded pipe (10) which serves as the outlet.

2. The composite filter cartridge for condensate purification with ion exchange function as described in claim 1, characterized in that: A lower baffle (12) is provided on the pipe wall at the connection between the central filter tube (1) and the threaded tube (10), and an upper baffle (11) is provided at the other end of the central filter tube (1). The upper baffle (11) closes the end of the central filter tube (1), and the upper baffle (11) and the lower baffle (12) fix and limit the two ends of the filter layer.

3. The composite filter cartridge for condensate polishing with ion exchange function as described in claim 2, characterized in that: The upper baffle (11) is connected to a fixing screw (19), and an upper end cover (13) is fitted on the fixing screw (19). An upper gasket (14) is also provided between the upper end cover (13) and the upper baffle (11). An end cover nut (15) for locking the upper end cover is also provided on the fixing screw (19). A lower end cover (16) is fitted on the threaded tube (10), and a lower gasket (17) is also provided between the lower end cover (16) and the lower baffle (12). A locking nut (18) for locking the lower end cover (16) is also fitted on the threaded tube (10).

4. The composite filter cartridge for condensate polishing with ion exchange function as described in claim 1, characterized in that: The ion exchange fibers include one or more of the following: strong acid cation exchange fibers, weak acid cation exchange fibers, strong basic anion exchange fibers, weak basic anion exchange fibers, and chelating fibers.

5. The composite filter cartridge for condensate polishing with ion exchange function as described in claim 1, characterized in that: The outer filter layer (23) has a thickness of 2-3 mm, the ion exchange layer (22) has a thickness of 15-20 mm, and the inner filter layer (21) has a thickness of 0.5-1 mm.

Images