A sulfuric acid loading system for loading sulfuric acid into a car

Abstract

The present application relates to the technical field of chemical equipment, and discloses an acid product loading system for sulfuric acid loading, which comprises a main filter cylinder and a secondary filter cylinder, the rotatable main filter cylinder and the rotatable secondary filter cylinder are matched with a filter membrane belt assembly which can be wound, when the filter membrane efficiency is reduced due to filter residue accumulation, the filter membrane can be transferred between the main filter cylinder and the secondary filter cylinder by driving the main filter cylinder and the secondary filter cylinder to rotate; meanwhile, scrapers arranged on both sides of the moving path of the filter membrane belt assembly can scrape off the filter residue on the surface of the filter membrane during the movement of the filter membrane; compared with the prior art, the present application realizes cleaning of the filter membrane belt assembly without disassembling the equipment, reduces the cleaning steps, thereby greatly shortens the downtime, and further improves the overall loading efficiency, while significantly reducing the maintenance time and labor cost. In addition, the present application realizes collection and centralized discharge of the filter residue through cooperation of the funnel-shaped tank bottom and the residue discharge valve.

Description

Technical Field

[0001] This invention relates to the technical field of chemical equipment, and specifically to an acid loading system for loading sulfuric acid onto trucks. Background Technology

[0002] In the production of industrial sulfuric acid, ensuring the purity of the final product is a core quality indicator. Due to impurities inherent in the raw materials (such as sulfur or pyrite) and trace solid particles such as catalyst dust and sulfur ash generated during roasting and conversion processes, the finished sulfuric acid product may contain solid impurities. These solid particles reduce the purity of sulfuric acid and affect its performance in high-end downstream applications such as electronics, electroplating, and fine chemicals.

[0003] Therefore, to ensure the quality of the finished product, sulfuric acid must be filtered before delivery to remove solid impurities before being injected into transport tankers and transported to downstream users. The specific process is as follows: First, the produced sulfuric acid is temporarily stored in a sulfuric acid storage tank; when loading is carried out, the sulfuric acid is drawn from the storage tank and transported to a filtration device for filtration to remove solid impurities; the filtered sulfuric acid is then transported to a metering tank for mass measurement to improve the accuracy of the loading quantity; after metering, the sulfuric acid is output from the metering tank and injected into the transport tanker via the loading arm, completing the loading operation.

[0004] In sulfuric acid filtration, a filter device equipped with a filter cartridge is typically used. The sulfuric acid storage tank is connected to the inlet of the filter device via a pipeline. A centrifugal pump, installed on the pipeline, provides the power to pump the sulfuric acid from the storage tank into the filter device. Inside the filter device, the sulfuric acid to be filtered permeates the filter cartridge under pressure, trapping solid particles on the surface or inside the cartridge. However, as filtration continues, solid particles accumulate, gradually forming a poorly permeable filter cake layer on the cartridge, significantly reducing the sulfuric acid flow rate and lowering the filtration efficiency. At this point, the filter cartridge needs to be cleaned to restore its filtration efficiency.

[0005] Currently, filter element cleaning mainly relies on manual cleaning. Specifically: first, the operation of the filtration unit needs to be stopped; second, the residual sulfuric acid inside the filtration unit must be completely drained; after the sulfuric acid is drained, clean water is injected into the filtration unit to wash away the residual sulfuric acid, and then drained; subsequently, the filter element is disassembled, removed from the filtration unit, and transported to the cleaning area, where solid impurities attached to its surface are removed by high-pressure washing or chemical cleaning; after cleaning, it is reinstalled back into the filtration unit; finally, a seal test and equipment debugging are completed before filtration operations can resume. The entire cleaning process involves multiple steps, including shutdown, draining, disassembly, cleaning, and reassembly. It is not only cumbersome but also time-consuming, directly causing prolonged interruptions in sulfuric acid filtration and ultimately leading to a decrease in overall loading efficiency. Summary of the Invention

[0006] The present invention aims to provide an acid loading system for loading sulfuric acid, which can clean the filter membrane belt assembly without disassembling the equipment, thereby shortening downtime and improving overall loading efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: 1) An acid loading system for loading sulfuric acid, comprising a tank body with an inlet and an outlet, and a filter element structure for filtering sulfuric acid inside the tank body. The filter element structure includes a rotatable main filter cylinder, a secondary filter cylinder, and a filter membrane belt assembly. The filter membrane belt assembly is switchably wound around the main filter cylinder and the secondary filter cylinder. The bottoms of the main filter cylinder and the secondary filter cylinder are both closed. The tops of the main filter cylinder and the secondary filter cylinder are each provided with several outlets for sulfuric acid to pass through. The side walls of the main filter cylinder and the secondary filter cylinder are each provided with through holes for sulfuric acid to pass through. The outlet is connected to each outlet. A cleaning structure for cleaning filter residue on the filter membrane belt assembly is provided between the main filter cylinder and the secondary filter cylinder.

[0008] In this invention, initially, the filter membrane belt assembly is wound around the main filter cylinder, connecting the liquid outlet on the main filter cylinder with the discharge outlet of the tank. Sulfuric acid, pressurized by a centrifugal pump, enters through the inlet of the tank and fills the internal space of the tank. Under pressure, the sulfuric acid passes through the filter membrane belt assembly wound around the main filter cylinder from the outside to the inside. At the same time, solid particulate impurities contained in the sulfuric acid are blocked and trapped on the outside of the filter membrane belt assembly. The filtered sulfuric acid then passes through the through holes in the side wall of the filter membrane belt assembly and the main filter cylinder in sequence, entering the interior of the main filter cylinder. Subsequently, the filtered sulfuric acid flows upward under pressure and is finally discharged through the liquid outlet of the main filter cylinder and the discharge outlet of the tank, and then transported to the subsequent stages.

[0009] As filtration continues, filter cake accumulates on the surface of the filter membrane belt assembly, leading to a decrease in filtration efficiency. At this point, the injection of sulfuric acid into the tank is paused, and then the main filter cartridge and the secondary filter cartridge are rotated. As the main filter cartridge and the secondary filter cartridge rotate, the filter membrane belt assembly wound on the main filter cartridge gradually unwinds and winds onto the secondary filter cartridge. Simultaneously, during the movement of the filter membrane belt assembly, the cleaning structure located between the main filter cartridge and the secondary filter cartridge removes the filter cake from the filter membrane belt assembly. Once the filter membrane belt assembly is completely wound onto the secondary filter cartridge, the cleaning of the filter membrane belt assembly is completed. Subsequently, sulfuric acid is continuously injected into the tank for filtration. Simultaneously, the outlet at the top of the secondary filter cartridge is connected to the outlet of the tank. The sulfuric acid passes through the filter membrane assembly and is then discharged sequentially through the through-holes in the side wall of the secondary filter cartridge and the outlet at the top. This invention utilizes a rotatable main filter cartridge, a secondary filter cartridge, and a rollable filter membrane assembly working in tandem. This allows for cleaning of the filter membrane assembly without disassembling the equipment, reducing cleaning steps, significantly shortening downtime, and ultimately improving overall loading efficiency.

[0010] 2) An acid loading system for loading sulfuric acid according to 1), wherein: The outlet is connected to a secondary discharge pipe, which is equipped with a discharge valve. All discharge valves are connected to the main discharge pipe at the end furthest from the secondary discharge pipe. The main discharge pipe passes through the outlet and extends out of the tank.

[0011] In this invention, the discharge valve is used to open or close the flow of sulfuric acid in the secondary discharge pipe to which it is located. Specifically, when the filter membrane belt assembly is wound around the main filter cylinder, the discharge valve on the discharge pipe connected to the main filter cylinder is opened. The sulfuric acid passes sequentially through the filter membrane belt assembly, the through hole on the side wall of the main filter cylinder, and the liquid outlet at the top, and then enters the secondary discharge pipe and the main discharge pipe connected to the main filter cylinder, and is finally discharged and transported to the subsequent processing stage.

[0012] When the filter membrane belt assembly is wound onto the secondary filter cartridge, the discharge valve on the discharge pipe connected to the secondary filter cartridge is opened. Sulfuric acid passes sequentially through the filter membrane belt assembly, the through holes on the side wall of the secondary filter cartridge, and the liquid outlet at the top. It then enters the secondary discharge pipe and the main discharge pipe connected to the secondary filter cartridge, and is finally discharged and transported to the subsequent processing stage.

[0013] 3) An acid loading system for loading sulfuric acid according to 2), wherein: The filter membrane tape assembly includes a rollable fixing net with filter membranes on both sides. The top and bottom sides of the fixing net are provided with barrier strips that allow gaps to be formed between adjacent filter membranes after winding and are rollable.

[0014] In this invention, a fixing net is used to support and install the filter membrane. The mesh structure of the fixing net allows sulfuric acid to pass smoothly through the mesh openings of the fixing net after passing through the filter membrane on one side, and then flow to the filter membrane on the other side. The filter membranes on both sides of the fixing net are used to filter sulfuric acid, allowing it to pass through while trapping solid particulate impurities within the sulfuric acid on the outside of the filter membrane. The presence of filter membranes on both sides of the fixing net enhances the filtration effect.

[0015] When the filter membrane belt assembly is wound onto the main filter cartridge or the secondary filter cartridge, the barrier strips on the fixing net will also curl up. At this time, the adjacent barrier strips come into contact with each other, creating gaps between adjacent filter membranes. This prevents the adjacent filter membranes from sticking together and blocking the pores on the filter membrane, thus allowing sulfuric acid to pass through the filter membrane belt assembly smoothly and continuously.

[0016] 4) An acid loading system for loading sulfuric acid according to 3), wherein: The cleaning structure includes two scrapers disposed inside the tank. The two scrapers are located on both sides of the moving path of the filter membrane belt assembly, with the end face of the scraper facing the corresponding filter membrane and the end face of the scraper in contact with the corresponding filter membrane.

[0017] In this invention, when the filter membrane belt assembly moves between the two scrapers, the two scrapers can scrape off the filter residue on their respective filter membranes.

[0018] 5) An acid loading system for loading sulfuric acid according to 1), wherein: Both the main filter cartridge and the secondary filter cartridge are equipped with a rotating shaft at the bottom. The end of the rotating shaft facing the inner wall of the tank passes through the tank and is connected to a servo motor. The rotating shaft is rotatably connected to the tank, and the servo motor is located at the bottom of the tank.

[0019] In this invention, when the filter belt assembly needs to be cleaned, a servo motor connected to the bottom rotating shaft of the main filter cylinder is activated. This servo motor drives the rotating shaft to rotate, and the rotation of the rotating shaft causes the main filter cylinder to rotate accordingly. Simultaneously, a servo motor connected to the bottom rotating shaft of the secondary filter cylinder is activated. This servo motor drives the rotating shaft to rotate, and the rotation of the rotating shaft causes the secondary filter cylinder to rotate accordingly. As the main and secondary filter cylinders rotate, the filter belt assembly can be moved. During the movement, the cleaning structure can clean the filter residue on the filter belt assembly.

[0020] 6) An acid loading system for loading sulfuric acid according to 1), wherein: The bottom of the tank is funnel-shaped, and a slag discharge port is opened at the bottom of the tank. The slag discharge port is connected to a slag discharge pipe, and a slag discharge valve is installed on the slag discharge pipe.

[0021] In this invention, the bottom of the tank is funnel-shaped, allowing the filter residue cleaned by the cleaning structure to slide down the slope of the bottom of the tank and accumulate at the bottom; the slag discharge port is the outlet of the filter residue and is connected to the slag discharge pipe, and the slag discharge valve is used to control the connection and disconnection of the slag discharge pipe; when it is necessary to discharge the filter residue, the slag discharge valve is opened to allow the accumulated filter residue to be discharged smoothly; during the sulfuric acid filtration process, the slag discharge valve needs to be closed to avoid leakage.

[0022] Compared with the prior art, the present invention also has the following technical effects: This invention utilizes a rotatable main filter cartridge and a secondary filter cartridge in conjunction with a rollable filter membrane belt assembly. When the filter membrane efficiency decreases due to filter cake accumulation, the filter membrane can be transferred between the main and secondary filter cartridges by driving their rotation. Simultaneously, scrapers positioned on both sides of the filter membrane belt assembly's movement path remove filter cake from the membrane surface during its movement. Compared to existing technologies, this invention enables cleaning of the filter membrane belt assembly without disassembling the equipment, reducing cleaning steps and significantly shortening downtime, thereby improving overall loading efficiency and substantially reducing maintenance time and labor costs. Furthermore, this invention achieves centralized collection and discharge of filter cake through the cooperation of a funnel-shaped tank bottom and a discharge valve. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an acid loading system for loading sulfuric acid into trucks according to the present invention.

[0024] Figure 2 This is a top view of an acid loading system for loading sulfuric acid according to the present invention. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: tank body 1, feed inlet 2, main filter cylinder 3, secondary filter cylinder 4, through hole 5, secondary discharge pipe 6, discharge valve 7, main discharge pipe 8, fixed mesh 9, filter membrane 10, barrier strip 11, scraper 12, rotating shaft 13, servo motor 14, slag discharge pipe 15, filter membrane belt assembly 16, and rotary joint 17.

[0026] See the example. Figure 1 and Figure 2As shown in the figure, an acid loading system for loading sulfuric acid in this embodiment includes a filtration device for filtering sulfuric acid and removing solid particles therein. The filtration device includes a cylindrical tank 1, with an inlet 2 at the lower part of the side wall of the tank 1 and an outlet at the upper part of the side wall of the tank 1. The bottom of the tank 1 is funnel-shaped, and a slag discharge port is opened in the middle of the bottom of the tank 1. The slag discharge port is connected to a slag discharge pipe 15 through a flange, and a slag discharge valve is connected to the slag discharge pipe 15 through a flange. Four filter element structures are installed inside the tank 1. The filter element structure includes a rotatable main filter cylinder 3, a secondary filter cylinder 4, and a filter membrane belt assembly 16 disposed between the main filter cylinder 3 and the secondary filter cylinder 4. The filter membrane belt assembly 16 includes a fixing mesh 9. Both sides of the top and bottom of the fixing mesh 9 are integrally formed with blocking strips. These blocking strips are used to create gaps between adjacent filter membranes 10 after winding. Filter membranes 10 are hot-pressed onto both sides of the fixing mesh 9. Both the fixing mesh 9 and the blocking strips are made of polytetrafluoroethylene (PTFE). PTFE has excellent corrosion resistance, ensuring long-term stability of the fixing mesh 9 and blocking strips in sulfuric acid environments. Furthermore, the flexibility of PTFE itself allows the fixing mesh 9 and blocking strips to withstand repeated winding without deformation or damage. The two ends of the fixing mesh 9 are fixedly connected to the side walls of the main filter cylinder 3 and the secondary filter cylinder 4 respectively via bolts and nuts.

[0027] The bottoms of the main filter cylinder 3 and the secondary filter cylinder 4 are both closed. The side walls of the main filter cylinder 3 and the secondary filter cylinder 4 are each provided with several through holes 5 for sulfuric acid to pass through. The tops of the main filter cylinder 3 and the secondary filter cylinder 4 are rotatably connected to the secondary discharge pipe 6 via a rotary joint 17. The secondary discharge pipe 6 is threaded with a discharge valve 7. The ends of all discharge valves 7 away from the secondary discharge pipe 6 are threadedly connected to the main discharge pipe 8. The end of the main discharge pipe 8 extends out of the tank body 1 through the discharge port. A first sealing ring is installed between the main discharge pipe 8 and the tank body 1.

[0028] The bottom of both the main filter cartridge 3 and the secondary filter cartridge 4 are fixedly connected to a rotating shaft 13 by bolts and nuts. The end of the rotating shaft 13 facing the inner wall of the tank 1 passes through the tank 1 and is connected to a servo motor 14. The output shaft of the servo motor 14 is fixedly connected to the end of the rotating shaft 13 by a coupling. The servo motor 14 is fixedly connected to the bottom of the tank 1 by bolts and nuts. The rotating shaft 13 and the tank 1 are rotatably connected by a sealed bearing.

[0029] Scrapers 12 are installed on both sides of the moving path of each filter membrane belt assembly 16. The scrapers 12 on both sides of each filter membrane belt assembly 16 are symmetrical. The top and bottom of the scrapers 12 are fixedly connected to the inner wall of the tank 1 by bolts and nuts. The end face of the scraper 12 faces the corresponding filter membrane 10. The end face of the scraper 12 is in contact with the corresponding filter membrane 10. The length of the part of the scraper 12 in contact with the filter membrane 10 matches the length of the filter membrane 10.

[0030] Detailed Implementation of This Embodiment Initially, the filter membrane belt assembly 16 is wound around the main filter cylinder 3. During filtration, the discharge valve 7 on the secondary discharge pipe 6, which is connected to the main filter cylinder 3, is first opened. Then, sulfuric acid pressurized by the centrifugal pump enters through the inlet 2 of the tank 1 and fills the internal space of the tank 1. Under pressure, the sulfuric acid passes through the filter membrane 10 on the outside of the fixed mesh 9, the fixed mesh 9, and the filter membrane 10 on the inner side of the fixed mesh 9 in sequence to complete the filtration. Then, the sulfuric acid enters the interior of the main filter cylinder 3 through the through hole 5 on the side wall of the main filter cylinder 3. Finally, the sulfuric acid continues to collect upward and is discharged through the liquid outlet at the top of the main filter cylinder 3, the corresponding secondary discharge pipe 6, and the main discharge pipe 8.

[0031] As the filtration operation continues, the filter residue accumulated on the surface of the filter membrane belt assembly 16 increases, leading to a decrease in filtration efficiency. Therefore, the filter membrane 10 needs to be cleaned to meet filtration requirements. First, the injection of sulfuric acid into the tank 1 is paused. Then, the servo motors 14 at the bottom of the main filter cylinder 3 and the secondary filter cylinder 4 are simultaneously started. The output shafts of the two servo motors 14 begin to rotate, driving the rotating shaft 13 connected to them to rotate, thereby causing the main filter cylinder 3 and the secondary filter cylinder 4 to rotate accordingly. As the main filter cylinder 3 and the secondary filter cylinder 4 rotate, the filter membrane belt assembly 16 wound on the main filter cylinder 3 gradually unfolds, and simultaneously, the unfolded filter membrane belt assembly 16 winds onto the secondary filter cylinder 4. During the movement of the filter membrane belt assembly 16, the scrapers 12 on both sides of the filter membrane belt assembly 16 can scrape off the filter residue on the filter membrane 10 that is attached to it. When the filter membrane belt assembly 16 is completely wound onto the secondary filter cylinder 4, the cleaning of the filter membrane 10 on both sides of the fixing mesh 9 is also completed.

[0032] After the filter membrane 10 is cleaned, the discharge valve 7 on the secondary discharge pipe 6 connected to the main filter cylinder 3 is closed, and the discharge valve 7 on the secondary discharge pipe 6 connected to the secondary filter cylinder 4 is opened. Sulfuric acid, pressurized by the centrifugal pump, continues to enter through the inlet 2 of the tank 1 and fills the internal space of the tank 1. Under pressure, the sulfuric acid passes sequentially through the filter membrane 10 on the outer side of the fixed mesh 9 on the secondary filter cylinder 4, the fixed mesh 9, and the filter membrane 10 on the inner side of the fixed mesh 9, completing the filtration. Subsequently, the sulfuric acid enters the interior of the secondary filter cylinder 4 through the through-hole 5 on the side wall of the secondary filter cylinder 4. Finally, the sulfuric acid continues to rise and is discharged through the liquid outlet at the top of the secondary filter cylinder 4, the corresponding secondary discharge pipe 6, and the main discharge pipe 8. Furthermore, when the sulfuric acid filtration is completed and the filter residue needs to be recovered, the slag discharge valve is opened, and the filter residue enters the slag discharge pipe 15 through the slag discharge port and is discharged, facilitating subsequent unified processing.

[0033] The above are merely embodiments of the present invention. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An acid loading system for loading sulfuric acid, comprising a tank body, wherein the tank body is provided with an inlet and an outlet, characterized in that, The tank is equipped with a filter element structure for filtering sulfuric acid. The filter element structure includes a rotatable main filter cylinder, a secondary filter cylinder, and a filter membrane belt assembly. The filter membrane belt assembly is switchably wound around the main filter cylinder and the secondary filter cylinder. The bottoms of the main filter cylinder and the secondary filter cylinder are both closed. The tops of the main filter cylinder and the secondary filter cylinder are each provided with an outlet for sulfuric acid to pass through. The side walls of the main filter cylinder and the secondary filter cylinder are each provided with several through holes for sulfuric acid to pass through. The discharge port can communicate with each discharge port. A cleaning structure for cleaning filter residue on the filter membrane belt assembly is provided between the main filter cylinder and the secondary filter cylinder.

2. The acid loading system for loading sulfuric acid according to claim 1, characterized in that: The liquid outlet is connected to and communicates with a secondary discharge pipe. The secondary discharge pipe is equipped with a discharge valve. The ends of all discharge valves away from the secondary discharge pipe are connected to a main discharge pipe. The main discharge pipe passes through the discharge outlet and extends out of the tank body.

3. The acid loading system for loading sulfuric acid according to claim 2, characterized in that: The filter membrane tape assembly includes a rollable fixing net with filter membranes on both sides. The top and bottom sides of the fixing net are provided with barrier strips that allow gaps to be formed between adjacent filter membranes after winding and are rollable.

4. The acid loading system for loading sulfuric acid according to claim 3, characterized in that: The cleaning structure includes two scrapers disposed inside the tank. The two scrapers are located on both sides of the moving path of the filter membrane belt assembly, and the end face of the scraper faces the corresponding filter membrane, and the end face of the scraper is in contact with the corresponding filter membrane.

5. The acid loading system for loading sulfuric acid according to claim 1, characterized in that: Both the main filter cylinder and the secondary filter cylinder are equipped with a rotating shaft at their bottom. One end of the rotating shaft facing the inner wall of the tank passes through the tank and is connected to a servo motor. The rotating shaft is rotatably connected to the tank, and the servo motor is located at the bottom of the tank.

6. The acid loading system for loading sulfuric acid according to claim 1, characterized in that: The bottom of the tank is funnel-shaped, and a slag discharge port is provided at the bottom of the tank. The slag discharge port is connected to a slag discharge pipe, and a slag discharge valve is provided on the slag discharge pipe.

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