A sulfuric acid plant flue gas purification acidic wastewater treatment system

Abstract

The present invention relates to the field of carbon disulfide production, and specifically relates to an acidic wastewater treatment system for flue gas purification in a sulfuric acid plant, which includes a waste acid tank, a homogenization tank, a precision filter, a dilute acid dosing tank, and a circulation water tank. A waste acid pump is provided in the waste acid tank for transporting the waste acid to the homogenization tank. A pickling pump is provided in the homogenization tank for transporting the acid solution to the precision filter. The outlet of the precision filter is communicated with the dilute acid dosing tank. The circulation water tank is provided with a dilute acid addition channel and a metal ion slow-release agent addition channel, and the outlet of the dilute acid dosing tank is communicated with the dilute acid addition channel. It can reduce the consumption of lime and the discharge amount of sewage, improve the concentration ratio of circulating water, reduce water consumption and sewage discharge.

Description

Technical Field

[0001] The present invention relates to the field of carbon disulfide production, and more particularly, to an acidic wastewater treatment system for flue gas purification in a sulfuric acid plant. Background Art

[0002] In the production of carbon disulfide from sulfur and natural gas with sulfuric acid production as a supporting process, dilute acid wastewater is generated in the sulfuric acid purification section. The existing treatment process mainly involves neutralization by adding slaked lime, followed by concentration and filtration through a filter press to remove sulfate and sulfite ions, and then discharging the qualified water after filtration into the park sewage treatment plant. The calcium sulfate and calcium sulfite solids generated by the neutralization reaction form filter cakes after passing through a diaphragm filter press, and after removing a part of the water, they are entrusted for external treatment as general solid waste.

[0003] This treatment method consumes a large amount of slaked lime, generates solid waste, has a large amount of sewage discharged, and also requires the use of a filter press, resulting in a significant increase in production costs and environmental protection costs.

[0004] In view of this, the present application is specifically proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an acidic wastewater treatment system for flue gas purification in a sulfuric acid plant, which can reduce lime consumption and sewage discharge, improve the concentration ratio of circulating water, and reduce water consumption and sewage discharge.

[0006] The embodiments of the present invention are implemented as follows:

[0007] An acidic wastewater treatment system for flue gas purification in a sulfuric acid plant, comprising: a waste acid tank, a homogenization tank, a precision filter, a dilute acid dosing tank, and a circulating water tank.

[0008] The waste acid tank is provided with a waste acid pump for transporting waste acid to the homogenization tank. The homogenization tank is provided with an acid lifting pump for transporting acid liquid to the precision filter. The outlet of the precision filter is connected to the dilute acid dosing tank. The circulating water tank is provided with a dilute acid addition channel and a metal ion slow-release agent addition channel, and the outlet of the dilute acid dosing tank is connected to the dilute acid addition channel.

[0009] Furthermore, metering pumps are provided in both the dilute acid addition channel and the metal ion slow-release agent addition channel.

[0010] Furthermore, the dilute acid dosing tank includes: a tank body, a delivery pump, a filter cylinder, a piston, and a drive assembly.

[0011] The filter cylinder is arranged near the top of the tank body. The bottom of the filter cylinder is provided with a liquid outlet, and a filter layer is arranged on the inner bottom wall of the filter cylinder. The side wall of the filter cylinder is provided with a liquid inlet. The inlet end of the delivery pump is arranged at the bottom of the tank body, and the outlet end of the delivery pump is connected to the liquid inlet.

[0012] The piston is slidably and sealingly fitted in the filter cartridge and driven by a driving assembly. The driving assembly is used to drive the piston above the liquid inlet so that the transfer pump can inject liquid into the filter cartridge. The driving assembly is also used to push the piston towards the bottom of the filter cartridge to complete the filtration of the acid liquid.

[0013] Furthermore, the dilute acid dosing tank further includes a sleeve and a driving part.

[0014] The bottom of the sleeve is a mesh plate. A central rod is arranged inside the sleeve, and the central rod is coaxially arranged with the sleeve. An arc-shaped connecting block is arranged on the outer side wall of the sleeve, and the arc-shaped connecting block extends along the circumferential direction of the sleeve. The arc-shaped connecting block is a hollow structure, and an arc-shaped communication hole for communicating the arc-shaped connecting block and the inside of the sleeve is provided on the side wall of the sleeve, and the arc-shaped communication hole is arranged along the extending direction of the arc-shaped connecting block.

[0015] A plurality of filter cartridges are accommodated in the sleeve, and the filter cartridges are accommodated in the area between the central rod and the side wall of the sleeve, and the filter cartridges are distributed along the circumferential direction of the sleeve. Along the circumferential direction of the sleeve, the filter cartridges are slidably fitted in the sleeve.

[0016] The driving part cooperates with the filter cartridge to drive the filter cartridge to rotate along the circumferential direction of the sleeve, so that the liquid inlet of the filter cartridge is intermittently communicated with the arc-shaped communication hole.

[0017] Furthermore, the filter cartridge is further provided with a guiding piece. The guiding piece is fan-shaped and arranged along the circumferential direction of the sleeve, and the guiding piece is simultaneously attached to the side wall of the sleeve and the central rod.

[0018] The guiding piece is a hollow structure. The inner cavity of the guiding piece is communicated with the liquid inlet. The inner cavity of the guiding piece penetrates radially to the outer side wall of the guiding piece to form a communication port for communicating with the arc-shaped communication hole, and the communication port extends along the circumferential direction of the guiding piece.

[0019] Furthermore, the filter cartridges in the sleeve are abutted against each other through the ends of the guiding pieces.

[0020] Furthermore, the driving assembly includes: a first rotating member, a second rotating member, and an L-shaped driving rod.

[0021] The first rotating member and the second rotating member are rotatably installed on the barrel body. The rotation axis line of the first rotating member is arranged along the axial direction of the filter cartridge and is arranged on the sleeve. The rotation axis line of the second rotating member is arranged along the radial direction of the filter cartridge. The installation height of the second rotating member is higher than the installation height of the first rotating member.

[0022] The first rotating member is provided with a plurality of first fitting through holes arranged at intervals along its circumferential direction, and the number of the first fitting through holes is the same as the number of the filter cartridges. The second rotating member is provided with a plurality of second fitting through holes arranged at intervals along its circumferential direction, and the number of the second fitting through holes is the same as the number of the filter cartridges.

[0023] One end of the L-shaped driving rod is slidably fitted in the first fitting through hole, and the other end is slidably fitted in the second fitting through hole and extends towards the filter cartridge. One end of the L-shaped driving rod close to the filter cartridge constitutes a driving part, and one end of the L-shaped driving rod close to the filter cartridge is connected to the piston.

[0024] When the first rotating member and the second rotating member rotate synchronously, the L-shaped driving rod can drive the filter cartridge to move circumferentially along the sleeve and reciprocally drive the piston to move inside the filter cartridge.

[0025] Further, the L-shaped driving rod has an inner cavity that penetrates to its end, and the piston is sleeved on the end of the L-shaped driving rod.

[0026] A recessed area is formed on the outer end face of the piston. A perforation that penetrates the piston is formed in the recessed area, and the perforation communicates with the inner cavity of the L-shaped driving rod. An elastic cushion block for closing the perforation is accommodated in the recessed area, and one side edge of the elastic cushion block is integrally connected to the piston.

[0027] Further, the dilute acid dosing tank further includes: a partition plate. The partition plate is connected to the inner wall of the tank body and is arranged perpendicular to the axial direction of the tank body, and the edges of the partition plate are all connected to the inner wall of the tank body. The driving assembly is located on one side of the partition plate away from the bottom of the tank body, the sleeve is located on one side of the partition plate close to the bottom of the tank body, and the partition plate is provided with a relief through hole for the driving part to pass through.

[0028] Further, the filter cartridge is located in the middle of the guiding piece and penetrates the guiding piece. The inner cavity of the guiding piece is in a fan-shaped ring shape, and the inner cavity of the guiding piece extends from the communication port towards the side where the central rod is located. The liquid inlet extends circumferentially along the filter cartridge, the inner cavity of the guiding piece extends to the liquid inlet, and along the circumferential direction of the filter cartridge, both ends of the liquid inlet are respectively flush with the inner wall of the inner cavity of the guiding piece close to the central rod.

[0029] The beneficial effects of the technical solution of the embodiment of the present invention include:

[0030] The sulfuric acid device flue gas purification acidic wastewater treatment system provided by the embodiment of the present invention reduces the alkalinity of the circulating water by adding sulfuric acid to the circulating water, utilizes the acidic wastewater as a pH regulator for the circulating water, thereby increasing the circulating water concentration ratio, improving the water utilization rate, and reducing the sewage discharge amount. This method reduces the lime consumption, reduces the sewage discharge, increases the circulating water concentration ratio, reduces the water consumption and sewage discharge, and effectively reduces the production cost and environmental protection cost.

[0031] Generally speaking, the sulfuric acid device flue gas purification acidic wastewater treatment system provided by the embodiment of the present invention can reduce the lime consumption and the sewage discharge amount, increase the circulating water concentration ratio, and reduce the water consumption and sewage discharge. Description of the Drawings

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0033] Figure 1 Schematic diagram of the composition of the acidic wastewater treatment system for flue gas purification in a sulfuric acid plant provided by an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the overall structure of the dilute acid dosing tank of the acidic wastewater treatment system for flue gas purification in a sulfuric acid plant provided by an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the cooperation of the drive assembly, filter cylinder and sleeve of the dilute acid dosing tank of the acidic wastewater treatment system for flue gas purification in a sulfuric acid plant provided by an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the cooperation of the filter cylinder and the sleeve from the first perspective;

[0037] Figure 5 Schematic diagram of the cooperation of the filter cylinder and the sleeve from the second perspective;

[0038] Figure 6 Schematic diagram of the three-dimensional structure of the filter cylinder;

[0039] Figure 7 Schematic diagram of the bottom structure of the filter cylinder;

[0040] Figure 8 Schematic diagram of the internal structure of the filter cylinder;

[0041] Figure 9 Schematic diagram of the cooperation of the drive assembly and the piston;

[0042] Figure 10 Schematic diagram of the structure of the first rotating member;

[0043] Figure 11 Schematic diagram of the structure of the second rotating member;

[0044] Figure 12 Schematic diagram of the cooperation of the piston and the L-shaped drive rod.

[0045] Explanation of reference numerals:

[0046] Sulfuric acid plant flue gas purification acidic wastewater treatment system 2000; dirty acid tank 2100; homogenization tank 2200; precision filter 2300; circulating water tank 2400; dilute acid dosing barrel 1000; barrel body 100; partition 110; give way through hole 111; delivery pump 200; connecting pipe 210; filter cartridge 300; liquid outlet 310; liquid inlet 320; guide plate 340; connecting port 341; piston 400; recessed area 410; perforation 420; elastic pad 430; drive assembly 500; first rotating member 510; first matching through hole 511; second rotating member 520; second matching through hole 521; L-shaped drive rod 530; sleeve 600; mesh plate 610; center rod 620; arc-shaped connecting block 630; arc-shaped connecting hole 640. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0050] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0051] In addition, the terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0052] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arrangement", "installation", "connection", and "linkage" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Embodiment

[0054] Please refer to Figure 1 , this embodiment provides an acidic wastewater treatment system 2000 for flue gas purification of a sulfuric acid plant. The acidic wastewater treatment system 2000 for flue gas purification of the sulfuric acid plant includes: a waste acid tank 2100, a homogenization tank 2200, a precision filter 2300, a dilute acid dosing tank 1000, and a circulation water tank 2400.

[0055] The waste acid tank 2100 is provided with a waste acid pump for transporting waste acid to the homogenization tank 2200.

[0056] The homogenization tank 2200 is provided with an acid lifting pump for transporting acid liquid to the precision filter 2300.

[0057] The outlet of the precision filter 2300 is communicated with the dilute acid dosing tank 1000.

[0058] The circulation water tank 2400 is provided with a dilute acid addition channel and a metal ion slow-release agent addition channel, and the outlet of the dilute acid dosing tank 1000 is communicated with the dilute acid addition channel.

[0059] Both the dilute acid addition channel and the metal ion slow-release agent addition channel are provided with metering pumps.

[0060] By adding sulfuric acid to the circulating water to reduce the alkalinity of the circulating water, the acidic wastewater is used as a pH regulator for the circulating water, thereby increasing the concentration ratio of the circulating water, improving the water utilization rate, and reducing the sewage discharge. This method reduces the consumption of lime, reduces the external discharge of sewage, increases the concentration ratio of the circulating water, reduces the water consumption and the external discharge of sewage, and effectively reduces the production cost and environmental protection cost.

[0061] Generally speaking, the acidic wastewater treatment system 2000 for flue gas purification of the sulfuric acid plant can reduce the consumption of lime and the external discharge amount of sewage, and increase the concentration ratio of the circulating water, reduce the water consumption and the external discharge of sewage.

[0062] Furthermore, please combine Figures 2 to 12 , the dilute acid dosing tank 1000 includes: a tank body 100, a delivery pump 200, a filter cartridge 300, a piston 400, and a drive assembly 500.

[0063] The filter cartridge 300 is arranged near the top of the barrel body 100. A liquid outlet 310 is formed at the bottom of the filter cartridge 300, and a filter layer is arranged on the inner bottom wall of the filter cartridge 300. A liquid inlet 320 is formed in the side wall of the filter cartridge 300. The inlet end of the delivery pump 200 is arranged at the bottom of the barrel body 100, and the outlet end of the delivery pump 200 is communicated with the liquid inlet 320.

[0064] The piston 400 is slidably and sealingly fitted in the filter cartridge 300 and is driven by a driving assembly 500.

[0065] The driving assembly 500 is used to drive the piston 400 above the liquid inlet 320 so that the delivery pump 200 can inject liquid into the filter cartridge 300.

[0066] The driving assembly 500 is further used to push the piston 400 towards the bottom of the filter cartridge 300 to complete the filtration of the acid liquid in the filter cartridge 300.

[0067] Pressurized filtration of the acid liquid in the filter cartridge 300 by using the piston 400 can greatly improve the filtration efficiency, and it is convenient to select a filter layer with a higher selection and filtration rate, which can effectively ensure the filtration effect.

[0068] In this way, when the acid liquid filtered by the precision filter 2300 is stored in the dilute acid dosing tank 1000, the delivery pump 200 can also be used to circulate and transport the acid liquid, and re-filter the acid liquid during the circulation process to filter out the impurities that appear during the storage process.

[0069] Due to pressurized filtration with the aid of the piston 400, the delivery pump 200 only needs to be able to transport the acid liquid into the filter cartridge 300, which greatly reduces the requirements for the delivery pump 200. A smaller power of the delivery pump 200 can be selected, which is more energy-saving, and effectively reduces the pressure in the pipeline and the risk of acid liquid leakage.

[0070] In this embodiment, the dilute acid dosing tank 1000 further includes a sleeve 600 and a driving part.

[0071] The bottom of the sleeve 600 is a mesh plate 610, which is convenient for the acid liquid to pass through.

[0072] The axis line of the sleeve 600 is arranged along the height direction of the barrel body 100. The sleeve 600 is in a cylindrical shape. A central rod 620 is arranged inside the sleeve 600, and the central rod 620 is coaxially arranged with the sleeve 600. An arc-shaped connecting block 630 is arranged on the outer side wall of the sleeve 600. The arc-shaped connecting block 630 extends along the circumferential direction of the sleeve 600 and is arranged close to the top of the sleeve 600. The arc-shaped connecting block 630 is a hollow structure. An arc-shaped communication hole 640 for communicating the arc-shaped connecting block 630 and the inside of the sleeve 600 is provided on the side wall of the sleeve 600. The arc-shaped communication hole 640 is arranged along the extending direction of the arc-shaped connecting block 630. Along the circumferential direction of the sleeve 600, the extending length of the arc-shaped communication hole 640 is the same as the extending length of the inner cavity of the arc-shaped connecting block 630. The outlet end of the transfer pump 200 is communicated with the inner cavity of the arc-shaped connecting block 630 through a connecting pipe 210.

[0073] A plurality of filter cartridges 300 are accommodated in the sleeve 600. The filter cartridges 300 are accommodated in the area between the central rod 620 and the side wall of the sleeve 600. The filter cartridges 300 are also in a cylindrical shape and are distributed along the circumferential direction of the sleeve 600. Along the circumferential direction of the sleeve 600, the filter cartridges 300 are slidably fitted in the sleeve 600.

[0074] The driving part is engaged with the filter cartridge 300 to drive the filter cartridge 300 to rotate along the circumferential direction of the sleeve 600, so that the liquid inlet 320 of the filter cartridge 300 is intermittently communicated with the arc-shaped communication hole 640. That is, during the process of the driving part driving the filter cartridge 300 to move along the circumferential direction of the sleeve 600, when a filter cartridge 300 rotates to the side close to the arc-shaped connecting block 630, the liquid inlet 320 of this filter cartridge 300 can be communicated with the arc-shaped communication hole 640, so that the inner cavity of the arc-shaped connecting block 630 can be indirectly communicated with the inner cavity of the filter cartridge 300, and the transfer pump 200 can smoothly transfer the acid liquid into the filter cartridge 300 for filtration.

[0075] Furthermore, the filter cartridge 300 is further provided with a guiding piece 340. The guiding piece 340 is in a fan-shaped ring shape and is arranged along the circumferential direction of the sleeve 600. The guiding piece 340 is simultaneously in contact with the side wall of the sleeve 600 and the central rod 620.

[0076] The guiding piece 340 is a hollow structure. The inner cavity of the guiding piece 340 is communicated with the liquid inlet 320. The inner cavity of the guiding piece 340 penetrates along its radial direction to the outer side wall of the guiding piece 340 to form a communication port 341 for communicating with the arc-shaped communication hole 640. The communication port 341 extends along the circumferential direction of the guiding piece 340.

[0077] The filter cartridges 300 in the sleeve 600 are abutted against each other through the ends of the guiding pieces 340.

[0078] The filter cartridge 300 is located in the middle of the guiding piece 340 and penetrates through the guiding piece 340. The inner cavity of the guiding piece 340 is in a fan-shaped ring shape, and the inner cavity of the guiding piece 340 extends from the communication port 341 towards the side where the central rod 620 is located. The liquid inlet 320 extends along the circumferential direction of the filter cartridge 300, and the inner cavity of the guiding piece 340 extends to the liquid inlet 320. Along the circumferential direction of the filter cartridge 300, both ends of the liquid inlet 320 are flush with the inner wall of the inner cavity of the guiding piece 340 close to the central rod 620 respectively.

[0079] Specifically, each filter cartridge 300 is provided with two guiding pieces 340, and the two guiding pieces 340 are respectively arranged at both ends of the filter cartridge 300. The guiding piece 340 close to the top of the filter cartridge 300 has the above-mentioned hollow structure, and the guiding piece 340 close to the bottom of the filter cartridge 300 has a solid structure. The introduction of the guiding piece 340 can further improve the stability and smoothness of the filter cartridge 300 when moving in the sleeve 600, and prevent the filter cartridge 300 from accidentally rotating relative to the sleeve 600 when moving in the sleeve 600, so as to ensure that the liquid inlets 320 of the filter cartridge 300 can be smoothly and periodically communicated with the arc-shaped communication holes 640, and ensure that the transfer pump 200 can smoothly add liquid to the filter cartridge 300.

[0080] Furthermore, the driving assembly 500 includes: a first rotating member 510, a second rotating member 520, and an L-shaped driving rod 530.

[0081] The first rotating member 510 and the second rotating member 520 are rotatably installed on the barrel body 100. The rotation axis line of the first rotating member 510 is arranged along the axial direction of the filter cartridge 300 and is arranged above the sleeve 600, and the rotation axis line of the second rotating member 520 is arranged along the radial direction of the filter cartridge 300. The installation height of the second rotating member 520 is higher than the installation height of the first rotating member 510.

[0082] The first rotating member 510 is provided with a plurality of first mating through holes 511 arranged at intervals along its circumferential direction, and the number of the first mating through holes 511 is the same as the number of the filter cartridges 300. The second rotating member 520 is provided with a plurality of second mating through holes 521 arranged at intervals along its circumferential direction, and the number of the second mating through holes 521 is the same as the number of the filter cartridges 300. In this embodiment, the L-shaped driving rod 530 has a constant diameter, and the diameters of the first mating through holes 511 and the second mating through holes 521 are both adapted to the diameter of the L-shaped driving rod 530.

[0083] On the first rotating member 510, the diameter of the arc surface where the central axis of the first mating through hole 511 is located is the first diameter. On the second rotating member 520, the diameter of the arc surface where the central axis of the second mating through hole 521 is located is the second diameter. The first diameter is the same as the second diameter.

[0084] One end of the L-shaped driving rod 530 is slidably fitted in the first fitting through hole 511, and the other end is slidably fitted in the second fitting through hole 521 and extends towards the filter cartridge 300. One end of the L-shaped driving rod 530 close to the filter cartridge 300 constitutes a driving part, and one end of the L-shaped driving rod 530 close to the filter cartridge 300 is connected to the piston 400.

[0085] When the first rotating member 510 and the second rotating member 520 rotate synchronously, the L-shaped driving rod 530 can perform a reciprocating motion along the axial direction of the filter cartridge 300, and at the same time, it will also perform a motion along the circumferential direction of the sleeve 600. That is to say, the driving assembly 500 can simultaneously drive the piston 400 and drive the filter cartridge 300.

[0086] That is to say, the L-shaped driving rod 530 can drive the filter cartridge 300 to move along the circumferential direction of the sleeve 600, and reciprocatingly drive the piston 400 to move inside the filter cartridge 300. We need to set the relationship between the driving assembly 500 and the filter cartridge 300 as follows: when the filter cartridge 300 is driven to the side of the sleeve 600 away from the arc-shaped connecting block 630, the piston 400 is driven by the L-shaped driving rod 530 to the bottom of the filter cartridge 300; when the filter cartridge 300 is driven to the side of the sleeve 600 where the arc-shaped connecting block 630 is located, the piston 400 is driven by the L-shaped driving rod 530 to the top of the filter cartridge 300 and is above the liquid inlet 320.

[0087] Through this design, the driving assembly 500 can simultaneously complete the driving of the piston 400 and the driving of the filter cartridge 300, greatly improving the driving efficiency.

[0088] Among them, multiple filter cartridges 300 are alternately communicated with the arc-shaped communication holes 640, which can realize the continuous reception of the acid solution. Multiple filter cartridges 300 cooperate with each other to realize the "continuous" filtration of the acid solution, so that the transfer pump 200 does not need to stop intermittently and can continuously transport, which also reduces the control requirements for the transfer pump 200.

[0089] It should be noted that the first rotating member 510 and the second rotating member 520 need to be driven synchronously, and the angular velocities are controlled to be the same. It can be to simultaneously drive the first rotating member 510 and the second rotating member 520 synchronously by using the same driver, or to drive the first rotating member 510 and the second rotating member 520 respectively by using two drivers.

[0090] Furthermore, the L-shaped driving rod 530 has an inner cavity and its inner cavity penetrates through both ends of it, and the piston 400 is sleeved on the end of the L-shaped driving rod 530.

[0091] The outer end face of the piston 400 is provided with a recessed area 410. The recessed area 410 is provided with a perforation 420 that penetrates the piston 400. The perforation 420 communicates with the inner cavity of the L-shaped drive rod 530. An elastic cushion block 430 for closing the perforation 420 is accommodated in the recessed area 410. One side edge of the elastic cushion block 430 is integrally connected to the piston 400.

[0092] Through this design, when the piston 400 moves downward, the elastic cushion block 430 will fit against the recessed area 410 and close the perforation 420, enabling smooth pressure filtration. When the piston 400 moves upward, the elastic cushion block 430 can be separated from the recessed area 410, and the perforation 420 of the piston 400 is opened, allowing it to communicate with the outside through the inner cavity of the L-shaped drive rod 530 to achieve pressure balance and facilitate the smooth upward movement of the piston 400.

[0093] The dilute acid dosing tank 1000 further includes: a partition plate 110. The partition plate 110 is connected to the inner wall of the barrel 100 and is arranged perpendicular to the axial direction of the barrel 100. The edges of the partition plate 110 are all connected to the inner wall of the barrel 100. The drive assembly 500 is located on one side of the partition plate 110 away from the bottom of the barrel 100, and the sleeve 600 is located on one side of the partition plate 110 close to the bottom of the barrel 100. The partition plate 110 is provided with a relief through hole 111 for the drive part to pass through.

[0094] In summary, the sulfuric acid device flue gas purification acidic wastewater treatment system 2000 provided by the embodiments of the present invention can reduce lime consumption and the amount of sewage discharged, increase the circulating water concentration ratio, reduce water consumption and sewage discharge.

[0095] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flue gas purification acidic wastewater treatment system for a sulfuric acid plant, characterized in that, it includes: a waste acid tank, a homogenization tank, a precision filter, a dilute acid dosing tank and a circulation pool; The waste acid tank is provided with a waste acid pump for transporting waste acid to the homogenization tank; the homogenization tank is provided with an acid lifting pump for transporting acid liquid to the precision filter; the outlet of the precision filter is communicated with the dilute acid dosing tank; the circulation pool is provided with a dilute acid addition channel and a metal ion slow-release agent addition channel, and the outlet of the dilute acid dosing tank is communicated with the dilute acid addition channel; The dilute acid dosing tank includes: a barrel body, a delivery pump, a filter cylinder, a piston and a driving assembly; The filter cylinder is arranged near the top of the barrel body, the bottom of the filter cylinder is provided with a liquid outlet, and the inner bottom wall of the filter cylinder is provided with a filter layer; the side wall of the filter cylinder is provided with a liquid inlet; the inlet end of the delivery pump is arranged at the bottom of the barrel body, and the outlet end of the delivery pump is communicated with the liquid inlet; The piston is slidably and sealingly fitted in the filter cylinder and is driven by the driving assembly; the driving assembly is used to drive the piston above the liquid inlet so that the delivery pump can inject liquid into the filter cylinder; the driving assembly is also used to push the piston towards the bottom of the filter cylinder to complete the filtration of the acid liquid; The dilute acid dosing tank further includes a sleeve and a driving part; The bottom of the sleeve is a mesh plate, a central rod is arranged inside the sleeve, and the central rod is coaxially arranged with the sleeve; an arc-shaped connecting block is arranged on the outer side wall of the sleeve, and the arc-shaped connecting block extends along the circumferential direction of the sleeve; the arc-shaped connecting block is a hollow structure, and the side wall of the sleeve is provided with an arc-shaped communication hole for communicating the arc-shaped connecting block and the inside of the sleeve, and the arc-shaped communication hole is arranged along the extending direction of the arc-shaped connecting block; A plurality of the filter cylinders are accommodated in the sleeve, the filter cylinders are accommodated in the area between the central rod and the side wall of the sleeve, and the filter cylinders are distributed along the circumferential direction of the sleeve; along the circumferential direction of the sleeve, the filter cylinders are slidably fitted in the sleeve; The driving part cooperates with the filter cylinder to drive the filter cylinder to rotate along the circumferential direction of the sleeve, so that the liquid inlet of the filter cylinder is intermittently communicated with the arc-shaped communication hole; The driving assembly includes: a first rotating member, a second rotating member and an L-shaped driving rod; The first rotating member and the second rotating member are rotatably installed on the barrel body, the rotation axis of the first rotating member is arranged along the axial direction of the filter cylinder and is arranged above the sleeve, and the rotation axis of the second rotating member is arranged along the radial direction of the filter cylinder; the installation height of the second rotating member is higher than the installation height of the first rotating member; The first rotating member is provided with a plurality of first cooperation through holes arranged at intervals along its circumferential direction, and the number of the first cooperation through holes is the same as the number of the filter cylinders; the second rotating member is provided with a plurality of second cooperation through holes arranged at intervals along its circumferential direction, and the number of the second cooperation through holes is the same as the number of the filter cylinders; One end of the L-shaped driving rod is slidably fitted in the first fitting through hole and extends towards the filter cartridge, and the other end is slidably fitted in the second fitting through hole; one end of the L-shaped driving rod close to the filter cartridge constitutes the driving part, and one end of the L-shaped driving rod close to the filter cartridge is connected to the piston; When the first rotating member and the second rotating member rotate synchronously, the L-shaped driving rod can drive the filter cartridge to move along the circumferential direction of the sleeve and reciprocally drive the piston to move in the filter cartridge.

2. The acidic wastewater treatment system for flue gas purification of sulfuric acid plant according to claim 1, characterized in that, Metering pumps are provided in both the dilute acid addition channel and the metal ion slow-release agent addition channel.

3. The acidic wastewater treatment system for flue gas purification of sulfuric acid plant according to claim 1, characterized in that, The filter cartridge is further provided with guide pieces. The guide pieces are fan-shaped rings and are arranged along the circumferential direction of the sleeve. The guide pieces are simultaneously in contact with the side wall of the sleeve and the central rod; The guide piece is of a hollow structure. The inner cavity of the guide piece is communicated with the liquid inlet. The inner cavity of the guide piece penetrates radially to the outer side wall of the guide piece to form a communication port for communicating with the arc-shaped communication hole. The communication port extends along the circumferential direction of the guide piece.

4. The acidic wastewater treatment system for flue gas purification of sulfuric acid plant according to claim 3, characterized in that, The filter cartridges in the sleeve are abutted against each other through the ends of the guide pieces.

5. The acidic wastewater treatment system for flue gas purification of sulfuric acid plant according to claim 1, characterized in that, The L-shaped driving rod has an inner cavity and its inner cavity penetrates to its end. The piston is sleeved on the end of the L-shaped driving rod; A concave area is provided on the outer end face of the piston. A through hole penetrating the piston is provided in the concave area. The through hole is communicated with the inner cavity of the L-shaped driving rod; an elastic cushion block for closing the through hole is accommodated in the concave area, and one side edge of the elastic cushion block is integrally connected with the piston.

6. The acidic wastewater treatment system for flue gas purification of sulfuric acid plant according to claim 5, characterized in that, The dilute acid dosing tank further includes: a partition plate; the partition plate is connected to the inner wall of the barrel body and is arranged perpendicular to the axial direction of the barrel body. The edges of the partition plate are all connected to the inner wall of the barrel body; the driving assembly is located on one side of the partition plate away from the bottom of the barrel body, the sleeve is located on one side of the partition plate close to the bottom of the barrel body, and the partition plate is provided with a relief through hole for the driving part to pass through.

7. The acidic wastewater treatment system for flue gas purification of sulfuric acid plant according to claim 3, characterized in that, The filter cartridge is located in the middle of the guide piece and penetrates through the guide piece; the inner cavity of the guide piece is fan-shaped, and the inner cavity of the guide piece extends towards the side where the central rod is located from the communication port; the liquid inlet extends along the circumferential direction of the filter cartridge, and the inner cavity of the guide piece extends to the liquid inlet. Along the circumferential direction of the filter cartridge, both ends of the liquid inlet are flush with the inner wall of the inner cavity of the guide piece close to the side of the central rod.

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