A fire-resistant, high-efficiency acid and metal ion removal, dehydration and filtration system

Abstract

This invention provides a high-efficiency acid removal, metal ion removal, and dehydration filtration system for fire-resistant oil, comprising: a dry ion exchange resin acid removal filter, a nitrogen membrane dehydrator, and a fine filter. The acid removal outlet of the dry ion exchange resin acid removal filter is connected to the inlet of the nitrogen membrane dehydrator via a pipe, and the outlet of the nitrogen membrane dehydrator is connected to the fine filter inlet of the fine filter via a pipe. The dry ion exchange resin acid removal filter contains a dry ion exchange resin filter element, and a self-made dry ion exchange resin membrane is installed on the filter element. This high-efficiency acid removal, metal ion removal, and dehydration filtration system for fire-resistant oil adopts a combined solution of acid removal, dehydration, and fine filtration. The process is simple and easy to operate, and it can significantly improve the removal efficiency of water, particulate impurities, and acidic substances from contaminated oil in fire-resistant oil.

Description

Technical Field

[0001] This invention relates to the field of purification equipment technology, specifically to a fire-resistant, high-efficiency acid and metal ion removal and dehydration filtration system. Background Technology

[0002] Fire-resistant oil is composed of phosphate esters. It is transparent and uniform in appearance. New oil is slightly yellow or orange-red, free of sediment, with low volatility, good anti-wear properties, good stability, and physical stability. The fire-resistant oil used in the electro-hydraulic control system of power plants is a fire-resistant pure phosphate ester liquid. Flame retardancy is one of the most prominent characteristics of phosphate esters. It can burn even at extremely high temperatures, but it does not propagate the flame or can quickly self-extinguish after ignition. Phosphate esters have high thermal oxidation stability.

[0003] Currently, fire-resistant oil is prone to contamination by water, particulate impurities, acidic substances and other pollutants during actual use. Therefore, in the actual purification process, it is necessary to efficiently remove the water, particulate impurities, acidic substances and other pollutants mixed in the fire-resistant oil. Existing purification devices have the following main defects when treating contaminated fire-resistant oil: (1) Existing fire-resistant oil is prone to producing strong acids due to oxidation, high-temperature degradation and hydrolysis. Moreover, it also produces weak acids and alkylphenol alcohols during hydrolysis, as well as dissolved metal ions and metal soap colloids from external contaminants. Existing resin filter elements have a generally poor removal effect on the above-mentioned strong acids, weak acids, alkylphenol alcohols, metal ions and metal soap colloids; (2) Existing filtration systems have complex processes and low removal efficiency for water, particulate impurities and acidic substances; (3) The degree of integration is low. Multiple functions cannot be integrated into the same device, which occupies a large space, has a complex layout, and high operating costs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a highly efficient acid and metal ion removal and dehydration filtration system for fire-resistant oil. Through innovative design of the dry ion exchange membrane and the adoption of a combined solution of acid removal, dehydration, and fine filtration, the process is simple and can significantly improve the removal efficiency of water, particulate impurities, acidic substances, metal ions, and metal soap colloids from contaminated oil in fire-resistant oil.

[0005] To achieve the above technical solution, this invention provides a fire-resistant oil high-efficiency acid and metal ion removal, dehydration, and filtration system, comprising: a dry ion exchange resin acid removal filter, a nitrogen membrane dehydrator, and a fine filter. The acid removal outlet of the dry ion exchange resin acid removal filter is connected to the oil inlet of the nitrogen membrane dehydrator via a pipe, and the oil outlet of the nitrogen membrane dehydrator is connected to the fine filter inlet of the fine filter via a pipe. The dry ion exchange resin acid removal filter contains a dry ion exchange resin filter element, and a self-made dry ion exchange resin membrane is installed on the dry ion exchange resin filter element. The dry ion exchange resin membrane is prepared by the following method:

[0006] S1. Add the swollen polystyrene spheres, pentaethylenehexamine, triethylenetetramine and paraformaldehyde sequentially to the reaction vessel, then add concentrated hydrochloric acid as a solvent, reflux in an oil bath at 120-130°C for 12 hours, cool, filter and wash several times to obtain amino resin intermediate A.

[0007] S2. Weigh the corresponding mass of amino resin intermediate A, paraformaldehyde, phenylphosphine, hypophosphite, and piperazine. Using concentrated hydrochloric acid solution as solvent, add them sequentially to the reaction vessel. Strictly control the reaction temperature at 120℃~130℃. After the reaction is complete, remove the product from the reaction vessel, cool it, evaporate excess solvent from the solution, and add an appropriate amount of ethanol solution to precipitate a white precipitate. Dry it to constant weight.

[0008] S3. Dissolve a small amount of the obtained product in distilled water until it is nearly saturated, then transfer it to a stirred container. In a stirred reflux apparatus, add 4% by weight of bis(2-chloroethyl)amine hydrochloride of the synthetic resin, adjust the pH of the reaction system to 8-10, and the reaction temperature to 60-70℃. Stir continuously until a white precipitate is formed, filter, wash with water several times until neutral, and finally dry under vacuum until the resin mass remains unchanged to obtain a polyaminophosphate chelated dry ion exchange membrane.

[0009] Preferably, in step S1, 1-2 kg of swollen polystyrene spheres, 0.3-0.5 kg of pentaethylenehexamine, 0.1-0.2 kg of triethylenetetramine and 0.6-0.9 kg of paraformaldehyde are added sequentially to the reaction vessel, followed by the addition of 1-2 L of concentrated hydrochloric acid as a solvent.

[0010] Preferably, in step S2, 1-2 kg of amino resin intermediate A, 0.2-0.5 kg of paraformaldehyde, 0.5-0.8 kg of phenylphosphine, 0.2-0.4 kg of hypophosphite, and 0.4-0.8 kg of piperazine are weighed and added sequentially to the reaction vessel using 1-2 L of concentrated hydrochloric acid solution as the solvent.

[0011] Preferably, the dry ion exchange resin deacidification filter includes a deacidification end cap, which is provided with a deacidification oil inlet and a deacidification oil outlet. A housing is installed below the deacidification end cap, and a dry ion exchange resin filter element is installed inside the housing. A dry ion exchange resin membrane is installed on the dry ion exchange resin filter element. The central hole of the dry ion exchange resin filter element communicates with the deacidification oil inlet. The cavity formed by the outer wall of the dry ion exchange resin filter element and the inner wall of the housing communicates with the deacidification oil outlet. A drain pipe is installed at the bottom of the housing. A connecting flange is also provided at the top of the deacidification end cap. An interface plug is provided on the connecting screw hole provided on the connecting flange. A drain connector is installed on the drain pipe of the dry ion exchange resin deacidification filter, and a sludge collection tank is installed on the drain connector.

[0012] Preferably, a drain sealing ring is installed at the connection between the drain pipe and the drain connector of the dry ion exchange resin deacidification filter.

[0013] Preferably, the nitrogen membrane dehydrator includes an upper cover and a lower cover, and a nitrogen separation membrane filter element is installed between the upper cover and the lower cover. The top of the upper cover is provided with an oil inlet, and the oil inlet is connected to the deacidification oil outlet of the dry ion exchange resin deacidification filter through a pipe. The bottom of the lower cover is provided with an oil outlet, and the side of the lower cover is provided with a drain outlet.

[0014] Preferably, the fine filter includes a fine filter end cap, which is provided with a fine filter oil inlet and a fine filter oil outlet. The fine filter oil inlet is connected to the oil outlet of the nitrogen membrane dehydrator via a pipe. A protective shell is installed below the fine filter end cap, and a PTFE filter element is installed inside the protective shell. An impurity collection hopper is installed below the PTFE filter element, and an interface screw is installed at the bottom of the impurity collection hopper.

[0015] Preferably, a connecting flange is installed on the top of the fine filter end cap, an instrument connector is installed on the connecting flange, a detection instrument is installed on the instrument connector, and a sealing ring is installed at the joint between the fine filter end cap and the protective shell.

[0016] The beneficial effects of the fire-resistant, high-efficiency acid removal, metal ion removal, dehydration, and filtration system provided by this invention are as follows:

[0017] (1) This fire-resistant, high-efficiency acid and metal ion removal and dehydration filtration system innovatively designs and synthesizes a self-made polyaminophosphate chelated dry ion exchange membrane, achieving an acid value treatment capacity greater than 0.05±0.01 mgKOH / g and an acid removal capacity of 15 gme / ft. 3 It is compatible with ester-based oils and mineral oils, and has metal ion removal capabilities: Ca / Mg / Fe / Na < 10 ppm.

[0018] (2) This fire-resistant oil high-efficiency acid removal, metal ion removal, dehydration and filtration system has a simple structure. Through the innovative design of the dry ion exchange membrane and the combination of acid removal + dehydration + fine filtration, the process is simple and can greatly improve the removal effect of water, particulate impurities, acidic substances, metal ions and metal soap colloids in fire-resistant oil.

[0019] (3) This fire-resistant oil high-efficiency acid and metal ion removal dehydration filtration system combines a dry ion exchange resin filter and a nitrogen membrane dehydrator for use in fire-resistant oil systems. It is specifically designed for fire-resistant oil systems and can effectively remove strong acids produced by oxidation, high-temperature degradation and hydrolysis of fire-resistant oil. It can also effectively remove weak acids and alkylphenol alcohols produced by hydrolysis, as well as dissolved metal ions and metal soap colloids from external contaminants. The polyaminophosphate chelated dry ion exchange resin membrane combined with the nitrogen membrane dehydration device can actively remove water and prevent water from entering the system. It controls the amount of water and reduces the consumption of the acid removal filter. It can keep the water content below 100 ppm and can remove dissolved water, emulsified water and free water without producing water, thus significantly extending the service life of fire-resistant oil. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is an exploded view of the assembly structure of the dry ion exchange resin deacidification filter in this invention.

[0022] Figure 3 This is an exploded view of the assembly structure of the nitrogen membrane dehydrator in this invention.

[0023] Figure 4 This is an exploded view of the assembly structure of the fine filter in this invention.

[0024] In the diagram: 1. Dry ion exchange resin acid removal filter; 11. Acid removal end cap; 12. Acid removal oil inlet; 13. Acid removal oil outlet; 14. Outer shell; 15. Dry ion exchange resin filter element; 16. Drain sealing ring; 17. Drain pipe; 18. Drain connector; 19. Sludge collection tank; 110. Interface plug; 2. Nitrogen membrane dehydrator; 21. Upper end cap; 22. Nitrogen separation membrane filter element; 23. Lower end cap; 24. Oil inlet interface; 25. Oil outlet interface; 26. Drain interface; 3. Fine filter; 31. Fine filter end cap; 32. Fine filter oil inlet; 33. Fine filter oil outlet; 34. Connecting flange; 35. Instrument connector; 36. Detection instrument; 37. Sensor; 38. Sealing ring; 39. PTFE filter element; 310. Impurity collection hopper; 311. Protective shell; 312. Interface screw. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0026] Example: A fire-resistant oil high-efficiency acid removal, metal ion removal, and dehydration filtration system.

[0027] Reference Figures 1 to 4 As shown, a high-efficiency acid removal, metal ion removal, and dehydration filtration system for fire-resistant oil includes: a dry ion exchange resin acid removal filter 1, a nitrogen membrane dehydrator 2, and a fine filter 3. The acid removal outlet 13 of the dry ion exchange resin acid removal filter 1 is connected to the oil inlet 24 of the nitrogen membrane dehydrator 2 via a pipe, and the oil outlet 25 of the nitrogen membrane dehydrator 2 is connected to the fine filter inlet 32 ​​of the fine filter 3 via a pipe. In actual operation, the fire-resistant oil is first pumped to the dry ion exchange resin acid removal filter 1 for acid removal, then enters the nitrogen membrane dehydrator 2 for dehydration, and finally enters the fine filter 3 for fine filtration and impurity removal.

[0028] The dry ion exchange resin deacidification filter is equipped with a dry ion exchange resin filter element 15, and a self-made dry ion exchange resin membrane is installed on the dry ion exchange resin filter element. The dry ion exchange resin membrane is prepared by the following method:

[0029] S1. Add 1.36 kg of swollen polystyrene spheres, 0.38 kg of pentaethylenehexamine, 0.12 kg of triethylenetetramine, and 0.72 kg of paraformaldehyde sequentially to the reaction vessel. Then add 1.5 L of concentrated hydrochloric acid as a solvent. Reflux in an oil bath at 120–130 °C for 12 h. Cool, filter, and wash several times to obtain amino resin intermediate A.

[0030] S2. Weigh 1.58 kg of amino resin intermediate A, 0.46 kg of paraformaldehyde, 0.62 kg of phenylphosphine, 0.22 kg of hypophosphite, and 0.48 kg of piperazine. Using 2 L of concentrated hydrochloric acid solution as solvent, add them sequentially to the reaction vessel. Strictly control the reaction temperature at 125 ± 2 °C. After the reaction is complete, remove the product from the reaction vessel, cool it, evaporate excess solvent from the solution, and add an appropriate amount of ethanol solution to precipitate a white precipitate. Dry it to constant weight.

[0031] S3. Dissolve a small amount of the obtained product in distilled water until it is nearly saturated, then transfer it to a stirred container. In a stirred reflux apparatus, add 4% by weight of bis(2-chloroethyl)amine hydrochloride of the synthetic resin, adjust the pH of the reaction system to 9, and set the reaction temperature to 65±2℃. Stir continuously until a white precipitate is formed, filter, wash with water several times until neutral, and finally dry under vacuum until the resin mass remains unchanged to obtain a polyaminophosphate chelated dry ion exchange membrane.

[0032] Performance comparison test experiment

[0033] The polyaminophosphate chelated dry ion exchange membrane prepared in Example 1, along with Comparative Example 1 (TS-1 anion exchange membrane produced by Beijing Zhengguang Chuangye Technology Co., Ltd.) and Comparative Example 2 (CD650 cation exchange membrane produced by Beijing Zhengguang Chuangye Technology Co., Ltd.), were subjected to filtration experiments on fire-resistant oil under the same conditions. The acid value and metal ion concentration of the fire-resistant oil before and after filtration were recorded. The results are shown in Table 1.

[0034] Table 1. Test results of acid value and metal ion concentration before and after fire-resistant oil filtration.

[0035]

[0036]

[0037] As can be seen from the data in Table 1 above, anion exchange membranes have good effects in acid removal, but poor effects in filtering metal ions. Conversely, cation exchange membranes have better effects in filtering metal ions, but poor effects in acid removal. The polyaminophosphate chelated dry ion exchange membrane prepared by this invention achieves good results in both acid removal and metal ion removal, combining the advantages of both anion and cation exchange membranes. It has an acid value treatment capacity greater than 0.05 ± 0.01 mg KOH / g and an acid removal capacity of 15 gme / ft. 3 It is compatible with ester-based oils and mineral oils, and has metal ion removal capabilities: Ca / Mg / Fe / Na < 10 ppm.

[0038] Reference Figure 2As shown, the dry ion exchange resin deacidification filter 1 includes a deacidification end cap 11, which is provided with a deacidification oil inlet 12 and a deacidification oil outlet 13. A housing 14 is installed below the deacidification end cap 11, and a dry ion exchange resin filter element 15 is installed inside the housing 14. A polyaminophosphate chelated dry ion exchange resin membrane is installed on the dry ion exchange resin filter element 15. The central hole of the dry ion exchange resin filter element 15 communicates with the deacidification oil inlet 12, and the outer wall of the dry ion exchange resin filter element 15... The cavity formed by the inner wall of the outer casing 14 is connected to the deacidification oil outlet 13. A drain pipe 17 is installed at the bottom of the outer casing 14, and a drain connector 18 is installed on the drain pipe 17. A sludge collection tank 19 is installed on the drain connector 18. The acidic impurities removed by the dry ion exchange resin deacidification filter 1 can be collected through the sludge collection tank 19 to prevent direct discharge and environmental pollution. A drain sealing ring 16 is installed at the joint between the drain pipe 17 and the drain connector 18 to ensure a good seal at the joint. The top of the deacidification end cap 11 is also provided with a connecting flange. The connecting bolt holes on the connecting flange are equipped with interface plugs 110. In actual operation, a series of detection instruments such as vacuum gauges, pressure gauges, and thermometers can be connected through the connecting flange to monitor the working status of the dry ion exchange resin deacidification filter 1 in real time. In actual operation, the contaminated oil to be treated enters the dry ion exchange resin filter element 15 through the deacidification inlet 12 of the dry ion exchange resin deacidification filter 1, and then enters the nitrogen membrane dehydrator 2 through the deacidification outlet 13 after passing through the dry ion exchange resin filter element 15. The dry ion exchange resin filter element 15 has an ion exchange function, which can react with acidic substances in the fire-resistant oil and remove them from the oil. As the operating time increases, the acid value of the fire-resistant oil will gradually decrease and be maintained at a low level, effectively slowing down the aging rate of the fire-resistant oil and extending its service life.

[0039] Reference Figure 3 As shown, the nitrogen membrane dehydrator 2 includes an upper cover 21 and a lower cover 23. A nitrogen separation membrane filter element 22 is installed between the upper cover 21 and the lower cover 23. The top of the upper cover 21 is provided with an oil inlet 24, which is connected to the deacidification oil outlet 13 of the dry ion exchange resin deacidification filter 1 via a pipe. The bottom of the lower cover 23 is provided with an oil outlet 25, and the side of the lower cover 23 is provided with a drain outlet 26. In actual operation, when the deacidified fire-resistant oil enters the nitrogen separation membrane filter element 22 of the nitrogen membrane dehydrator 2 through the oil inlet 24, the different permeation characteristics of the gas separation membrane for nitrogen and water vapor can be utilized to efficiently separate the moisture from the gas or liquid. When processing fire-resistant oil with high water content, the moisture content can be quickly reduced, so that the processed medium reaches a low water content standard. The removed moisture is discharged through the drain outlet 26, and the dehydrated fire-resistant oil enters the fine filter 3 through the oil outlet 25.

[0040] Reference Figure 4 As shown, the fine filter 3 includes a fine filter end cap 31, which has a fine filter inlet 32 ​​and a fine filter outlet 33. The fine filter inlet 32 ​​is connected to the outlet interface 25 of the nitrogen membrane dehydrator 2 via a pipe. A protective shell 311 is installed below the fine filter end cap 31. A sealing ring 38 is installed at the joint between the fine filter end cap 31 and the protective shell 311 to ensure a good seal. A PTFE filter element 39 is installed inside the protective shell 311. An impurity collection hopper 310 is installed below the PTFE filter element 39. An interface screw 312 is installed at the bottom of the impurity collection hopper 310 to facilitate quick connection between the impurity collection hopper 310 and external pipelines. A connecting flange 34 is installed on the top of the fine filter end cap 31. An instrument connector 35 is installed on the connecting flange 34. A detection instrument 36 is installed on the instrument connector 35 to monitor the working status of the fine filter 3 in real time. In actual operation, the dehydrated fire-resistant oil enters the fine filter 3 through the fine filter inlet 32. When the fire-resistant oil passes through the PTFE filter element 39 of the fine filter 3, the PTFE filter element 39 has a micropore filtration precision of 0.01 microns, which can effectively remove small suspended particles and other impurities in the fire-resistant oil, including some heavy metal ions. The impurities are collected by the impurity collection hopper 310 and discharged outward. Finally, the fire-resistant oil after acid removal, dehydration and fine filtration is discharged outward through the fine filter outlet 33.

[0041] This fire-resistant oil high-efficiency acid removal, metal ion removal, dehydration and filtration system has a simple structure and adopts a combination of acid removal, dehydration and fine filtration. The process is simple and can greatly improve the removal effect of water, particulate impurities and acidic substances in fire-resistant oil.

[0042] This high-efficiency acid and metal ion removal dehydration and filtration system for fire-resistant oil combines a dry ion exchange resin filter element and a nitrogen membrane dehydrator for use in fire-resistant oil systems. Specifically designed for fire-resistant oil systems, it effectively removes strong acids generated by oxidation, high-temperature degradation, and hydrolysis of the fire-resistant oil, as well as weak acids and alkylphenol alcohols produced by hydrolysis. It also removes dissolved metal ions and metal soap colloids from external contaminants. The polyaminophosphate chelated dry ion exchange resin membrane combined with the nitrogen membrane dehydration device actively removes and waterproofs the oil, controlling moisture content and reducing the consumption of the acid removal filter element. It can maintain moisture levels below 100 ppm and removes dissolved water, emulsified water, and free water without generating moisture, thus significantly extending the service life of the fire-resistant oil.

[0043] The above description is only a preferred embodiment of the present invention, but the present invention should not be limited to the content disclosed in the embodiments and drawings. Therefore, any equivalent or modified embodiments made without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A fire-resistant, high-efficiency acid removal, metal ion removal, dehydration, and filtration system, characterized in that... include: The system comprises a dry ion exchange resin acid removal filter, a nitrogen membrane dehydrator, and a fine filter. The acid removal outlet of the dry ion exchange resin acid removal filter is connected to the oil inlet of the nitrogen membrane dehydrator via a pipe. The oil outlet of the nitrogen membrane dehydrator is connected to the fine filter inlet of the fine filter via a pipe. The dry ion exchange resin acid removal filter contains a dry ion exchange resin filter element, and a self-made dry ion exchange resin membrane is mounted on the filter element. The dry ion exchange resin membrane is manufactured as follows: S1. Add the swollen polystyrene spheres, pentaethylenehexamine, triethylenetetramine and paraformaldehyde sequentially to the reaction vessel, then add concentrated hydrochloric acid as a solvent, reflux in an oil bath at 120~130℃ for 12 h, cool, filter and wash several times to obtain amino resin intermediate A. S2. Weigh the corresponding mass of amino resin intermediate A, paraformaldehyde, phenylphosphine, hypophosphite, and piperazine. Using concentrated hydrochloric acid solution as solvent, add them sequentially to the reaction vessel. Strictly control the reaction temperature at 120℃~130℃. After the reaction is complete, remove the product from the reaction vessel, cool it, evaporate excess solvent from the solution, and add an appropriate amount of ethanol solution to precipitate a white precipitate. Dry it to constant weight. S3. Dissolve a small amount of the obtained product in distilled water until it is nearly saturated, then transfer it to a stirred container. In a stirred reflux apparatus, add 4% by weight of bis(2-chloroethyl)amine hydrochloride of the synthetic resin, adjust the pH of the reaction system to 8-10, and the reaction temperature to 60-70℃. Stir continuously until a white precipitate is formed, filter, wash with water several times until neutral, and finally dry under vacuum until the resin mass remains unchanged to obtain a polyaminophosphate chelated dry ion exchange membrane.

2. The fire-resistant, high-efficiency acid removal, metal ion removal, and dehydration filtration system as described in claim 1, characterized in that: In step S1, 1-2 kg of swollen polystyrene spheres, 0.3-0.5 kg of pentaethylenehexamine, 0.1-0.2 kg of triethylenetetramine, and 0.6-0.9 kg of paraformaldehyde are added sequentially to the reaction vessel, followed by the addition of 1-2 L of concentrated hydrochloric acid as a solvent.

3. The fire-resistant, high-efficiency acid removal, metal ion removal, and dehydration filtration system as described in claim 1, characterized in that: In step S2, 1-2 kg of amino resin intermediate A, 0.2-0.5 kg of paraformaldehyde, 0.5-0.8 kg of phenylphosphine, 0.2-0.4 kg of hypophosphite, and 0.4-0.8 kg of piperazine are weighed and added sequentially to the reaction vessel using 1-2 L of concentrated hydrochloric acid solution as solvent.

4. The fire-resistant, high-efficiency acid removal, metal ion removal, and dehydration filtration system as described in claim 1, characterized in that: The dry ion exchange resin deacidification filter includes a deacidification end cap with an deacidification oil inlet and an deacidification oil outlet. A housing is installed below the end cap, and a dry ion exchange resin filter element is installed inside the housing. A dry ion exchange resin membrane is installed on the filter element. The central hole of the filter element communicates with the deacidification oil inlet. The cavity formed by the outer wall of the filter element and the inner wall of the housing communicates with the deacidification oil outlet. A drain pipe is installed at the bottom of the housing. A connecting flange is also provided at the top of the end cap, and an interface plug is fitted on the connecting bolt hole on the flange. A drain connector is installed on the drain pipe of the dry ion exchange resin deacidification filter, and a sludge collection tank is installed on the drain connector.

5. The fire-resistant, high-efficiency acid removal, metal ion removal, and dehydration filtration system as described in claim 4, characterized in that: The drain pipe of the dry ion exchange resin deacidification filter is fitted with a drain sealing ring at the connection between the drain pipe and the drain connector.

6. The fire-resistant, high-efficiency acid removal, metal ion removal, and dehydration filtration system as described in claim 1, characterized in that: The nitrogen membrane dehydrator includes an upper cover and a lower cover. A nitrogen separation membrane filter element is installed between the upper cover and the lower cover. An oil inlet is provided on the top of the upper cover. The oil inlet is connected to the deacidification oil outlet of the dry ion exchange resin deacidification filter through a pipe. An oil outlet is provided at the bottom of the lower cover. A drain outlet is provided on the side of the lower cover.

7. The fire-resistant, high-efficiency acid removal, metal ion removal, and dehydration filtration system as described in claim 1, characterized in that: The fine filter includes a fine filter end cap, which is provided with a fine filter oil inlet and a fine filter oil outlet. The fine filter oil inlet is connected to the oil outlet of the nitrogen membrane dehydrator through a pipe. A protective shell is installed below the fine filter end cap, and a PTFE filter element is installed inside the protective shell. An impurity collection hopper is installed below the PTFE filter element, and an interface screw is installed at the bottom of the impurity collection hopper.

8. The fire-resistant, high-efficiency acid removal, metal ion removal, and dehydration filtration system as described in claim 7, characterized in that: A connecting flange is installed on the top of the fine filter end cap, an instrument connector is installed on the connecting flange, a detection instrument is installed on the instrument connector, and a sealing ring is installed at the joint between the fine filter end cap and the protective shell.

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