Energy-saving device for acid liquid circulation filtration in hot coil pickling of steel strip

Abstract

The utility model discloses a kind of steel band hot coil pickling uses acid liquid circulation filtering energy-saving device, including primary filter assembly and secondary filter assembly, the utility model relates to pickling liquid circulation filtering device technical field;The steel band hot coil pickling uses acid liquid circulation filtering energy-saving device, by primary filter screen and secondary filtration to acid liquid fractional filtration, reduce the working load of circulating pump, simultaneously, filter plate is inclined to set, filter bowl is inverted cone structure, primary filter screen and secondary filter screen external impurity are naturally dropped by gravity, not easy to form relatively thick filter cake, reduce the work done by circulating pump to overcome filter screen resistance, reduce energy consumption, realize energy-saving effect, and install deslagging hopper in horizontal filter box and filter cartridge bottom, acid liquid flow rate in deslagging hopper interior is lower, so that impurity natural settlement, facilitate to pickling liquid circulation filtering equipment to carry out non-stop cleaning, further reduce the energy consumption of pickling liquid circulation equipment, to realize that pickling liquid carries out energy-saving circulation filtering operation.

Description

Technical Field

[0001] This utility model relates to the technical field of pickling solution circulation filtration devices, specifically an energy-saving pickling solution circulation filtration device for hot-rolled steel strip. Background Technology

[0002] Hot-rolled steel strip refers to steel coils formed by continuously casting and hot rolling molten steel at high temperatures. During the hot rolling process, the surface of the steel undergoes a violent chemical reaction with oxygen in the air, forming a hard, dense oxide layer that is firmly bonded to the substrate. Without removing this oxide layer, further processing is impossible. Therefore, after hot rolling, the hot-rolled steel strip needs to be placed in an pickling tank to remove the external oxide layer. The pickling solution in the tank can be recycled after filtration.

[0003] A pickling tank circulation filtration device disclosed in Chinese patent CN222266339U uses filter plates inside a filter cylinder to perform graded filtration of the pickling solution, removing difficult-to-dissolve impurities and making the pickling solution purer, thus improving the pickling efficiency of the pickling solution on metal pipes. The filter cylinder in the comparative patent has multiple sets of filter plates, and during the filtration process, the pickling solution passes through the filter plates at the top of the inner cavity of the filter cylinder sequentially, with the size of the filtered impurities decreasing from high to low. However, the comparative patent has the following problems: 1. The filtration operation of the pickling solution is continuous, and the pickling solution will fill the inside of the filter device. Compared with the filter plates in the patent, which are arranged in parallel, as the pickling solution is repeatedly filtered, impurities will form a thick filter cake on the filter plate. When the circulation pump is running, the resistance will increase continuously, thereby increasing the power of the circulation pump. When the filter cake on the top of the filter plate reaches a certain thickness, the circulation pump may even have difficulty circulating and filtering the pickling solution in the filter cylinder. 2. In order to improve the pickling effect of hot-rolled steel strip, the pickling solution in the pickling tank needs to be heated to 60℃~95℃, which can greatly accelerate the reaction and shorten the residence time of the steel strip in the pickling tank, thereby improving production efficiency. In contrast, in the patent, as the pickling solution is repeatedly filtered, the heat of the pickling solution is continuously lost. Before the pickling solution is circulated back into the pickling tank, the power loss of the heater for heating the pickling solution is relatively large. 3. In the comparison patent, the acid circulation equipment needs to be shut down periodically and the impurities accumulated inside the filter cylinder need to be cleaned. The long-term shutdown of the filter device not only affects the efficiency of the hot rolling pickling process of steel strip, but also requires a large amount of power to pump the acid in the pickling tank back into the filter cylinder for acid circulation when the circulation pump is restarted. All of the above will increase the power consumption of pickling solution circulation filtration, making it difficult to achieve the energy-saving effect of acid solution circulation filtration.

[0004] To address these issues, this invention provides an energy-saving acid circulation filtration device for hot-rolled steel strip pickling. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an energy-saving acid circulation filtration device for hot-rolled steel strip pickling, which solves the aforementioned problems.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: an energy-saving acid circulation filtration device for hot-rolled steel strip pickling, comprising a pickling tank and a pump, wherein a drain pipe A is fixedly connected between the pickling tank and the input end of the pump, a drain pipe B is fixedly connected to the output end of the pump, a heat exchanger is fixedly connected to one end of the drain pipe B, an inlet pipe A is fixedly connected to the side of the heat exchanger away from the drain pipe B, and a horizontal filter box is fixedly connected to the tail end of the inlet pipe A, wherein a primary filtration assembly is installed inside the horizontal filter box; The primary filtration assembly includes a connecting frame fixedly connected inside the horizontal filter box, a filter plate fixedly connected to the top of the connecting frame, a primary filter screen fixedly connected inside the filter plate, an inlet pipe B fixedly connected to the side of the horizontal filter box away from the inlet pipe A, a filter cylinder installed at the tail end of the inlet pipe B, and a secondary filtration assembly installed inside the filter cylinder. The secondary filtration assembly includes a filter hopper fixedly connected inside the filter cylinder, a secondary filter screen fixedly connected to the outside of the filter hopper, and a slag discharge assembly installed at the bottom of both the horizontal filter box and the filter cylinder. The slag discharge assembly includes a slag discharge hopper fixedly connected to the bottom of the horizontal filter box and the filter cylinder, and control valves are installed at both the input and output ends of the slag discharge hopper; A connecting pipe is installed at the top of the filter cartridge, and a circulation pump is fixedly connected to the tail of the connecting pipe. A heating component is installed between the output end of the circulation pump and the pickling tank. Both the horizontal filter box and the filter cylinder are equipped with vibration motors on their outer sides.

[0007] Preferably, the filter plate is installed at an angle on the top of the connecting frame, and the included angle between the filter plate and the connecting frame is set to between 60° and 75°.

[0008] Preferably, the filter funnel has an inverted conical structure.

[0009] Preferably, the pore size of the primary filter is larger than that of the secondary filter.

[0010] Preferably, the filter cartridge has a T-shaped structure, and the input end of the filter cartridge is located on the lower side of the filter bucket.

[0011] Preferably, the heating assembly includes a circulation pipe fixedly connected to the output end of the circulation pump, a heater fixedly connected to the tail end of the circulation pipe, and an assembly pipe fixedly connected between the output end of the heater and the pickling tank.

[0012] Preferably, the heater has two heating chambers inside, and the assembly tube is Y-shaped.

[0013] Preferably, a replenishment pipe A is fixedly connected to one side of the heat exchanger, and a replenishment pipe B is fixedly connected between the other side of the heat exchanger and the heater. The replenishment pipe B is connected to one of the heating chambers. Beneficial effects

[0014] This invention provides an energy-saving acid circulation filtration device for hot-rolled steel strip pickling. Compared with the prior art, it has the following advantages: This energy-saving acid circulation filtration device for hot-rolled steel strip pickling utilizes filter plates and a primary filter screen installed inside a horizontal filter box for initial filtration of the acid solution. A secondary filtration is then performed through a filter hopper inside the filter cartridge. The filter plates are angled, and the filter hopper has an inverted conical structure. Impurities filtered outside the primary and secondary filters naturally fall off due to gravity, preventing the formation of a thick filter cake. This reduces the work done by the circulation pump to overcome filter resistance, lowering energy consumption and achieving energy savings. Furthermore, during acid filtration, the replenished acid solution can be preheated via a heat exchanger, further reducing the energy required for acid heating. A slag discharge hopper is installed at the bottom of the horizontal filter box and filter cartridge. The low acid flow rate inside the slag discharge hopper allows impurities to settle naturally, facilitating non-stop cleaning of the acid circulation filtration equipment and further reducing energy consumption. This results in energy-efficient acid circulation filtration. Attached Figure Description

[0015] Figure 1 This is a perspective view of the external structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the horizontal filter box of this utility model; Figure 3 This is a schematic diagram of the structure of the primary filter assembly of this utility model; Figure 4 This is a schematic diagram of the internal structure of the filter cartridge of this utility model; Figure 5 This is a schematic diagram of the heating component of this utility model.

[0016] In the diagram: 1. Pickling tank; 2. Pump; 3. Drain pipe A; 4. Drain pipe B; 5. Heat exchanger; 6. Inlet pipe A; 7. Horizontal filter box; 8. Primary filter assembly; 801. Connecting frame; 802. Filter plate; 803. Primary filter screen; 9. Inlet pipe B; 10. Filter cartridge; 11. Secondary filter assembly; 1101. Filter hopper; 1102. Secondary filter screen; 12. Slag discharge assembly; 1201. Slag discharge hopper; 1202. Control valve; 13. Connecting pipe; 14. Circulating pump; 15. Heating assembly; 1501. Circulating pipe; 1502. Heater; 1503. Assembly pipe; 16. Vibration motor; 17. Makeup pipe A; 18. Makeup pipe B. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0018] Please see Figure 1-5 An energy-saving acid circulation filtration device for hot-rolled steel strip pickling includes a pickling tank 1 and a pump 2. A drain pipe A3 is fixedly connected between the input end of the pickling tank 1 and the pump 2. The input end of the drain pipe A3 is installed at the bottom of the outer side of the pickling tank 1. A drain pipe B4 is fixedly connected to the output end of the pump 2. A heat exchanger 5 is fixedly connected to one end of the drain pipe B4. An inlet pipe A6 is fixedly connected to the side of the heat exchanger 5 away from the drain pipe B4. A horizontal filter box 7 is fixedly connected to the tail end of the inlet pipe A6. A primary filter assembly 8 is installed inside the horizontal filter box 7. The primary filtration assembly 8 includes a connecting frame 801 fixedly connected inside the horizontal filter box 7. A filter plate 802 is fixedly connected to the top of the connecting frame 801. A primary filter screen 803 is fixedly connected inside the filter plate 802. An inlet pipe B9 is fixedly connected to the side of the horizontal filter box 7 away from the inlet pipe A6. A filter cartridge 10 is installed at the tail end of the inlet pipe B9. A secondary filtration assembly 11 is installed inside the filter cartridge 10. The secondary filtration assembly 11 includes a filter hopper 1101 fixedly connected inside the filter cylinder 10, a secondary filter screen 1102 fixedly connected to the outside of the filter hopper 1101, and a slag discharge assembly 12 installed at the bottom of both the horizontal filter box 7 and the filter cylinder 10. The slag discharge assembly 12 includes a slag discharge hopper 1201 fixedly connected to the bottom of the horizontal filter box 7 and the filter cylinder 10. Both the input and output ends of the slag discharge hopper 1201 are equipped with control valves 1202. A connecting pipe 13 is installed on the top of the filter cartridge 10, and a circulation pump 14 is fixedly connected to the tail of the connecting pipe 13. Vibration motors 16 are installed on the outside of both the horizontal filter box 7 and the filter cartridge 10.

[0019] The filter plate 802 is installed at an angle on the top of the connecting frame 801, and the included angle between the filter plate 802 and the connecting frame 801 is set between 60° and 75°.

[0020] The filter hopper 1101 has an inverted conical structure.

[0021] The pore size of the primary filter 803 is larger than that of the secondary filter 1102.

[0022] The filter cartridge 10 has a T-shaped structure, and the inlet end of the filter cartridge 10 is located on the lower side of the filter hopper 1101.

[0023] In this embodiment, after the hot-rolled steel strip is pickled in the pickling solution inside the pickling tank 1, the pump 2 draws the pickling tank 1 out from the drain pipe A3 and sends it into the heat exchanger 5 through the drain pipe B4. After flowing inside the heat exchanger 5, the acid solution enters the horizontal filter box 7 through the inlet pipe A6. The level of the acid solution rises slowly in the horizontal filter box 7 and passes through the primary filter screen 803 installed inside the filter plate 802. The primary filter screen 803 can filter out larger impurities. The pre-filtered acid solution enters the filter cylinder 10 through the inlet pipe B9. As the acid solution is continuously poured into the filter cylinder 10, the rising acid solution passes through the filter hopper 1101 installed on the outside. The secondary filter 1102 is installed, and the circulating pump 14 pumps the filter to the heating assembly 15 through the connecting pipe 13. Because the filter plate 802 and connecting frame 801 are inclined, and the filter hopper 1101 has an inverted conical structure, the filter surfaces of the primary filter 803 and secondary filter 1102 are inclined. The included angle between the filter plate 802 and connecting frame 801 is set between 60° and 90°. Gravity allows impurities to fall off automatically, preventing impurities from forming a filter cake on the outside of the primary filter 803 and secondary filter 1102. This reduces the impurity resistance of the primary filter 803 and secondary filter 1102. This reduces the energy consumption of the circulating pump 14, and further reduces the workload of the circulating pump 14 through multi-stage filtration. Since some impurities are sticky and cannot easily slide off the outside of the primary filter screen 803 or the secondary filter screen 1102, the vibration motor 16 can be manually or periodically turned on according to the pressure difference inside the pipeline. Vibration is transmitted to the filter plate 802 and filter hopper 1101 through mechanical transmission, shaking off firmly attached impurities and assisting in their removal. Alternatively, a non-stick coating can be used to treat the surfaces of the primary filter screen 803 and the secondary filter screen 1102 to reduce the adhesion of impurities. Meanwhile, the bottom of the horizontal filter box 7 and the filter cylinder 10... The installed slag discharge hopper 1201 slows down the flow rate of the acid inside, allowing the sliding impurities to settle naturally. The control valve 1202 at the input end of the slag discharge hopper 1201 is closed periodically, and the control valve 1202 at the output end of the slag discharge hopper 1201 is opened to discharge the impurities collected inside the slag discharge hopper 1201. During the slag cleaning process, it is not necessary to stop the equipment. Since the primary filter screen 803 and the secondary filter screen 1102 can achieve self-cleaning through the gravity of the impurities and the vibration motor 16, the work done by the circulating pump 14 to overcome the resistance of the filter screen is reduced, thus reducing the energy consumption of the circulating pump 14 and achieving the effect of energy saving.

[0024] A heating assembly 15 is installed between the output end of the circulating pump 14 and the pickling tank 1. The heating assembly 15 includes a circulation pipe 1501 fixedly connected to the output end of the circulating pump 14. A heater 1502 is fixedly connected to the tail end of the circulation pipe 1501. An assembly pipe 1503 is fixedly connected between the output end of the heater 1502 and the pickling tank 1. The assembly pipe 1503 is installed at the top outer side of the pickling tank 1.

[0025] The heater 1502 has two heating chambers inside, and the assembly tube 1503 is Y-shaped.

[0026] A replenishment pipe A17 is fixedly connected to one side of the heat exchanger 5, and a replenishment pipe B18 is fixedly connected between the other side of the heat exchanger 5 and the heater 1502. The replenishment pipe B18 is connected to one of the heating chambers.

[0027] In this embodiment, after the acid solution in pickling tank 1 reacts continuously with the hot-rolled steel strip, the concentration and volume of the acid solution will decrease. At this time, it is necessary to replenish the acid solution in pickling tank 1. In order to improve the pickling effect of the acid solution on the hot-rolled steel strip, it is necessary to heat the circulating filtration and replenished acid solution. After the acid solution in pickling tank 1 is filtered, it enters heater 1502 from the circulation pipe 1501 for heating. The acid solution discharged from pickling tank 1 has a high heat. When replenishing acid solution from replenishment pipe A17, heat exchanger 5 exchanges the heat of the acid solution discharged from pickling tank 1 with the heat of the replenished acid solution, thereby preheating the replenished acid solution, recovering and reusing the residual heat of the acid solution inside pickling tank 1, reducing the energy consumption of heater 1502, and further improving the energy-saving effect of acid solution circulation filtration. The heated acid solution is discharged into pickling tank 1 from assembly pipe 1503 to realize the reciprocating circulation of acid solution.

[0028] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving acid circulation filtration device for hot-rolled steel strip pickling, comprising a pickling tank (1) and a pump (2), characterized in that: A drain pipe A (3) is fixedly connected between the pickling tank (1) and the input end of the pump (2). A drain pipe B (4) is fixedly connected to the output end of the pump (2). A heat exchanger (5) is fixedly connected to one end of the drain pipe B (4). An inlet pipe A (6) is fixedly connected to the side of the heat exchanger (5) away from the drain pipe B (4). A horizontal filter box (7) is fixedly connected to the tail end of the inlet pipe A (6). A primary filter assembly (8) is installed inside the horizontal filter box (7). The primary filtration assembly (8) includes a connecting frame (801) fixedly connected inside the horizontal filter box (7). A filter plate (802) is fixedly connected to the top of the connecting frame (801). A primary filter screen (803) is fixedly connected inside the filter plate (802). An inlet pipe (9) is fixedly connected to the side of the horizontal filter box (7) away from the inlet pipe A (6). A filter cartridge (10) is installed at the tail end of the inlet pipe B (9). A secondary filtration assembly (11) is installed inside the filter cartridge (10). The secondary filtration assembly (11) includes a filter bucket (1101) fixedly connected inside the filter cylinder (10), and a secondary filter screen (1102) fixedly connected to the outside of the filter bucket (1101). A slag discharge assembly (12) is installed at the bottom of both the horizontal filter box (7) and the filter cylinder (10). The slag discharge assembly (12) includes a slag discharge hopper (1201) fixedly connected to the bottom of the horizontal filter box (7) and the filter cylinder (10). The input and output ends of the slag discharge hopper (1201) are equipped with control valves (1202). A connecting pipe (13) is installed on the top of the filter cartridge (10), and a circulation pump (14) is fixedly connected to the tail of the connecting pipe (13). A heating component (15) is installed between the output end of the circulation pump (14) and the pickling tank (1). Vibration motors (16) are installed on the outside of both the horizontal filter box (7) and the filter cylinder (10).

2. The energy-saving device for acid circulation filtration in hot-rolled steel strip pickling according to claim 1, characterized in that: The filter plate (802) is installed at an angle on the top of the connecting frame (801), and the included angle between the filter plate (802) and the connecting frame (801) is set between 60° and 75°.

3. The energy-saving device for acid circulation filtration in hot-rolled steel strip pickling according to claim 1, characterized in that: The filter bucket (1101) has an inverted cone structure.

4. The energy-saving device for acid circulation filtration in hot-rolled steel strip pickling according to claim 1, characterized in that: The pore size of the primary filter (803) is larger than that of the secondary filter (1102).

5. The energy-saving device for acid circulation filtration in hot-rolled steel strip pickling according to claim 1, characterized in that: The filter cartridge (10) has a T-shaped structure, and the input end of the filter cartridge (10) is located on the lower side of the filter bucket (1101).

6. The energy-saving device for acid circulation filtration in hot-rolled steel strip pickling according to claim 1, characterized in that: The heating assembly (15) includes a circulation pipe (1501) fixedly connected to the output end of the circulation pump (14), a heater (1502) fixedly connected to the tail end of the circulation pipe (1501), and an assembly pipe (1503) fixedly connected between the output end of the heater (1502) and the pickling tank (1).

7. The energy-saving device for acid circulation filtration in hot-rolled steel strip pickling according to claim 6, characterized in that: The heater (1502) has two heating chambers inside, and the assembly tube (1503) is Y-shaped.

8. The energy-saving device for acid circulation filtration in hot-rolled steel strip pickling according to claim 6, characterized in that: A replenishment pipe A (17) is fixedly connected to one side of the heat exchanger (5), and a replenishment pipe B (18) is fixedly connected between the other side of the heat exchanger (5) and the heater (1502). The replenishment pipe B (18) is connected to one of the heating chambers.

Images