Waste liquid treatment device for coal gas desulfurization

Abstract

The utility model provides a waste liquid treatment device for coal gas desulfurization, belongs to the technical field of wastewater treatment, and aims to solve the problems that only part of suspended solids can be removed or the pH value can be adjusted during desulfurization wastewater treatment in the prior art, and collaborative removal of pollutants such as sulfides, ammonia nitrogen, heavy metals and the like cannot be realized. The device comprises a waste liquid pool, a reaction tank, a decomposition tank and an ultrafilter which are sequentially communicated through communicating pipes, the waste liquid pool is connected with a liquid inlet pipe and is internally provided with a filter plate with filter holes, a first stirring shaft with stirring blades driven by a first motor is arranged in the reaction tank, the top of the reaction tank is connected with a liquid adding pipe, a second stirring shaft with stirring blades driven by a second motor is arranged in the decomposition tank, one side of the decomposition tank is provided with an air blower connected with the decomposition tank through an oxygen supply pipe, and the top of the decomposition tank is connected with an exhaust pipe. The device realizes full-flow treatment of waste liquid, the filter plate removes large impurities to prevent blockage, stirring promotes chemical reaction, oxygen supply and stirring improve microbial activity, the ultrafilter ensures effluent quality, efficient and continuous treatment can be realized, and pollution is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wastewater treatment technical field, concretely relates to a kind of waste liquid treatment device for coal gas desulfurization. BACKGROUND

[0002] Coal gas is widely used in the fields of steel, chemical industry, power generation as an important clean energy and industrial raw material. In order to reduce the emission of sulfides (such as SO2) in the process of coal gas combustion or use, it needs to be desulfurized. The current mainstream desulfurization processes include ammonia desulfurization, limestone-gypsum desulfurization and dry desulfurization. However, no matter which desulfurization process is used, wastewater will be produced in the desulfurization process, i.e. coal gas desulfurization wastewater.

[0003] Such wastewater has complex composition, usually containing high concentration of sulfides, ammonia nitrogen, suspended solids, and heavy metals such as mercury, lead and zinc, as well as a certain amount of COD (chemical oxygen demand) and salt substances. If the untreated desulfurization wastewater is directly discharged, it will cause serious pollution to the environment: sulfides will cause water body anoxia, produce odor and destroy aquatic ecosystems; excessive ammonia nitrogen will cause water eutrophication, leading to the proliferation of algae and further deterioration of water quality; heavy metals have biological accumulation and can enter the human body through the food chain, endangering human health; high salt and high COD components will reduce the self-purification ability of water body, and long-term accumulation will cause irreversible pollution to soil and groundwater.

[0004] Currently, there are some conventional methods for treating coal gas desulfurization wastewater, such as simple sedimentation and neutralization, but these methods can only remove part of the suspended solids or adjust pH value, and cannot achieve the simultaneous removal of sulfides, ammonia nitrogen, heavy metals and other pollutants. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a kind of waste liquid treatment device for coal gas desulfurization to solve the problem that the treatment of desulfurization wastewater in the prior art has some conventional methods, such as simple sedimentation and neutralization, but these methods can only remove part of the suspended solids or adjust pH value, and cannot achieve the simultaneous removal of sulfides, ammonia nitrogen, heavy metals and other pollutants.

[0006] The technical solution adopted by the utility model is as follows:

[0007] The utility model provides a kind of waste liquid treatment device for coal gas desulfurization, including waste liquid pool, reaction tank, decomposition tank and ultrafilter by communicating pipe communication in turn;One side of the waste liquid pool is communicated with liquid inlet pipe, and the inside of the waste liquid pool is equipped with filter plate, and a plurality of filter holes are provided on the filter plate;The inside of the reaction tank is rotatably connected with first stirring shaft, the stirring shaft is driven by first motor, and a plurality of first stirring blades are provided on the first stirring shaft, and the top of the reaction tank is communicated with liquid inlet pipe;Second stirring shaft is rotatably connected in the decomposition tank, the second stirring shaft is driven by second motor, and a plurality of second stirring blades are provided on the second stirring shaft, and the decomposition tank is also provided with air blower on one side, one end of the air blower is communicated with decomposition tank by oxygen supply pipe, and the top of the decomposition tank is communicated with exhaust pipe.

[0008] The technical scheme is characterized in that the communication pipe is used for connecting the treatment units in series, each communication pipe is provided with a water pump, the water pump provides water pressure to ensure the orderly flow of the waste liquid; the waste liquid pool is used for temporarily storing the coal gas desulfurization waste liquid to be treated and performing preliminary filtration; the liquid inlet pipe is responsible for introducing the waste liquid generated by the desulfurization system into the device; the filter plate and the filter hole are used for intercepting large-particle impurities (such as desulfurization waste residue, fibers and the like) in the waste liquid; the reaction tank is the main place for reagent reaction and is used for removing suspended solids, heavy metals and sulfides; the first stirring shaft and the first stirring blade are used for stirring the waste liquid and the reagent to make them fully mixed; the first motor provides power for stirring; the liquid adding pipe is used for adding polyaluminum chloride, polyacrylamide, sodium hydroxide, sodium hypochlorite and the like; the decomposition tank is used for decomposing the chemical oxygen demand and ammonia nitrogen through the action of microorganisms; the second stirring shaft and the second stirring blade are used for making the waste liquid fully contact with oxygen and microorganisms; the second motor provides power for stirring; the air blower provides oxygen to meet the metabolic demand of aerobic microorganisms; the oxygen supply pipe delivers oxygen into the decomposition tank; the exhaust pipe is used for discharging carbon dioxide, nitrogen and the like generated by the microbial decomposition; the ultrafilter is used for deep filtration to remove residual small impurities and colloids; the ultrafilter adopts the prior art and will not be described in detail here; working principle: the coal gas desulfurization waste liquid flows into the waste liquid pool from the liquid inlet pipe, first passes through the filter hole of the filter plate to intercept large impurities, and the filtered waste liquid enters the reaction tank under the action of the water pump through the communication pipe; polyaluminum chloride, polyacrylamide, sodium hydroxide and sodium hypochlorite are sequentially added through the liquid adding pipe, the first motor drives the first stirring shaft and the first stirring blade to rotate, the reagent and the waste liquid are fully mixed, polyaluminum chloride and polyacrylamide promote the small suspended solids to gather into flocs, sodium hydroxide adjusts the pH value to 9-10 to make the heavy metals generate precipitates, and sodium hypochlorite oxidizes the toxic sulfides; after the reaction, the flocs and the precipitates are settled, and the supernatant passes through the communication pipe into the decomposition tank; in the decomposition tank, the second motor drives the second stirring shaft and the second stirring blade to stir, at the same time, the air blower introduces oxygen through the oxygen supply pipe to provide oxygen for aerobic microorganisms, the microorganisms decompose the chemical oxygen demand (converted into carbon dioxide and water) and convert the ammonia nitrogen into nitrogen gas in the waste liquid, and the generated gas is discharged from the exhaust pipe; finally, the treated waste liquid enters the ultrafilter to further filter the residual impurities; in the utility model, through the sequentially arranged waste liquid pool, reaction tank, decomposition tank and ultrafilter, the whole process treatment from preliminary filtration to deep purification of the desulfurization waste liquid is realized; the filter plate effectively removes large impurities to avoid the subsequent equipment from being blocked; the stirring structure ensures that the reagent and the waste liquid are fully reacted to improve the pollutant removal efficiency; the combination of oxygen supply and stirring enhances the microbial activity to improve the decomposition effect of the chemical oxygen demand and the ammonia nitrogen; the ultrafilter ensures the water quality, and the whole device realizes efficient and continuous waste liquid treatment to reduce pollution emission.

[0009] Preferably, the filter plate is rotatably connected to a rotating shaft at its center. The rotating shaft is driven by a third motor. A connecting rod is provided on the side wall of the rotating shaft. The connecting rod is arranged radially along the rotating shaft. A plurality of stirring rods are provided at the bottom of the connecting rod. The plurality of stirring rods are spaced apart along the length direction of the connecting rod.

[0010] In this technical solution, it should be noted that the rotating shaft is used to drive the connecting rod and the stirring rod to rotate; the third motor provides power for the rotation of the rotating shaft; the connecting rod is used to connect the rotating shaft and the stirring rod and transmit torque; the stirring rod is used to agitate the waste liquid and impurities on the filter plate; working principle: after the third motor starts, it drives the rotating shaft to rotate, and the rotating shaft drives the connecting rod and the stirring rod at the bottom to rotate synchronously. When the stirring rod rotates above the filter plate, it agitates the waste liquid flowing through the filter plate, making it difficult for impurities in the waste liquid to accumulate above the filter holes, and at the same time promoting the waste liquid to pass through the filter holes more smoothly; in this solution, the rotation and agitation of the stirring rod effectively prevents the filter holes from being blocked by impurities, improves the filtration efficiency and continuity of the filter plate, reduces the frequency of downtime for cleaning due to blockage, and ensures stable operation of the device.

[0011] Preferably, the stirring rod includes a fixed rod and a telescopic rod. The fixed rod is fixedly connected to the bottom of the connecting rod. The fixed rod has a cavity inside. One end of the telescopic rod is located inside the cavity, and the other end slides downward through the fixed rod to contact the filter plate. The telescopic rod is connected to the fixed rod by a spring.

[0012] In this technical solution, it should be noted that the fixed rod provides installation and sliding support for the telescopic rod; the telescopic rod can extend and retract relative to the fixed rod to ensure contact with the filter plate; the cavity is used to accommodate the telescopic rod and the spring; the spring provides elasticity to the telescopic rod, ensuring it always fits against the filter plate; working principle: under the action of the spring, the bottom of the telescopic rod is always in close contact with the surface of the filter plate. When the stirring rod rotates with the shaft, the telescopic rod slides along the surface of the filter plate, scraping away impurities attached to the filter plate; when the surface of the filter plate is uneven or encounters large impurities, the telescopic rod can compress the spring and retract into the cavity of the fixed rod to avoid hard contact that could damage the components, and then restore contact with the filter plate under the spring force; in this solution, the telescopic stirring rod structure can effectively clean the attached impurities on the surface of the filter plate, prevent filter hole blockage, adapt to the unevenness of the filter plate surface and handle large impurities, avoid component wear or damage, and extend the service life of the filter plate and stirring rod.

[0013] Preferably, the bottom of the telescopic rod is movably connected with a ball bearing.

[0014] In this technical solution, it should be noted that the ball bearings are used to reduce the friction between the telescopic rod and the filter plate. When the telescopic rod rotates with the shaft and moves along the surface of the filter plate, the ball bearings roll on the surface of the filter plate, converting the sliding friction between the telescopic rod and the filter plate into rolling friction, which significantly reduces the frictional resistance.

[0015] Preferably, the inner wall of the waste liquid tank is provided with a guide groove, which is arranged along the height direction of the waste liquid tank; the side wall of the filter plate is provided with a guide block, which is slidably embedded in the guide groove; the top of the waste liquid tank is provided with a fixed pulley, which is located above the guide groove; a fourth motor is provided on one side of the waste liquid tank, and a rope is fixedly connected to the output shaft of the fourth motor. The end of the rope away from the fourth motor passes around the fixed pulley and is connected to the guide block.

[0016] In this technical solution, it should be noted that the guide groove and guide block work together to restrict the movement direction of the filter plate, ensuring that it rises and falls vertically; the fixed pulley is used to change the direction of force on the rope; the fourth motor provides power for the lifting and lowering of the filter plate; the rope is used to transmit tension, pulling the filter plate up and down; the working principle is as follows: when it is necessary to clean impurities on the filter plate, the fourth motor rotates forward, winding the rope. After the rope passes around the fixed pulley, it pulls the guide block to slide upward along the guide groove, causing the filter plate to rise to the upper part of the waste liquid pool, exposing the impurities; after cleaning, the fourth motor reverses, releasing the rope, and the filter plate descends along the guide groove under its own gravity, returning to its original position to continue filtering; in this solution, the setting of the fixed pulley, rope, and fourth motor realizes convenient lifting and lowering of the filter plate, making it easier for operators to clean large impurities trapped on the filter plate, reducing maintenance difficulty, and at the same time, the guide structure ensures the stability of the filter plate's lifting and lowering, avoiding deviation that may affect subsequent filtration.

[0017] Preferably, a mounting plate is provided on one side of the waste liquid tank, and a sliding groove is provided on the top of the mounting plate. A sliding block is slidably embedded in the sliding groove, and the third motor is mounted on the sliding block. The output shaft of the third motor is connected to the rotating shaft through a transmission belt. A driving device for driving the sliding block to move is provided on the mounting plate.

[0018] In this technical solution, it should be noted that the mounting plate provides the mounting base for the slide, slide block, and drive device; the slide and slide block cooperate to allow the third motor to move horizontally; the transmission belt is used to transmit the power of the third motor to the rotating shaft, enabling the same motor to drive the filter plate to rise and fall and the rotating shaft to rotate; the drive device is used to drive the slide block to move and adjust the position of the third motor; working principle: when it is necessary to drive the rotating shaft to rotate, the drive device drives the slide block to move along the slide, bringing the third motor closer to the rotating shaft, the transmission belt is tensioned, and the third motor drives the rotating shaft to rotate through the transmission belt; when it is necessary to drive the filter plate to rise and fall, the drive device drives the slide block to move, moving the third motor away from the rotating shaft, the transmission belt loosens, and the operator can remove the transmission belt to prevent motion interference with the rise of the filter plate; in this solution, the third motor is located outside the waste liquid tank, which can prevent the waste liquid inside the waste liquid tank from corroding the third motor. At the same time, the drive device drives the moving seat to move, so that the transmission belt can be loosened, making it easy for the operator to remove the transmission belt and preventing motion interference when raising and lowering the filter plate.

[0019] Preferably, the driving device includes a lead screw, the two ends of which are rotatably connected to the two ends of a slide groove, and the slide block is threadedly connected to the lead screw.

[0020] In this technical solution, it should be noted that when the lead screw is rotated, since the slide is threadedly connected to the lead screw and cannot rotate due to the restriction of the slide groove, the slide will move along the axial direction of the lead screw, thereby driving the third motor to move closer to or away from the rotating shaft and adjusting the tension of the transmission belt.

[0021] Preferably, a handwheel is fixedly connected to one end of the lead screw.

[0022] In this technical solution, it should be noted that the operator can easily adjust the position of the slide by turning the handwheel to rotate the lead screw, without the need for additional tools, thereby adjusting the tension of the transmission belt.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0024] 1. In this utility model, the waste liquid tank, reaction tank, decomposition tank, and ultrafiltration unit are arranged in sequence to achieve the whole process treatment of desulfurization waste liquid from preliminary filtration to deep purification; the filter plate effectively removes large impurities and avoids clogging of subsequent equipment; the stirring structure ensures that the reagents and waste liquid react fully, improving the pollutant removal efficiency; the combination of oxygen supply and stirring enhances microbial activity and improves the decomposition effect of chemical oxygen demand and ammonia nitrogen; the ultrafiltration unit ensures the quality of effluent; the whole device achieves efficient and continuous waste liquid treatment and reduces pollution emissions.

[0025] 2. In this utility model, the rotation and stirring of the stirring rod effectively prevents the filter holes from being blocked by impurities, improves the filtration efficiency and continuity of the filter plate, reduces the frequency of downtime for cleaning due to blockage, and ensures stable operation of the device;

[0026] 3. In this utility model, the retractable stirring rod structure can effectively clean the attached impurities on the surface of the filter plate, prevent the filter holes from clogging, adapt to the unevenness of the filter plate surface and deal with larger impurities, avoid wear or damage to the components, and extend the service life of the filter plate and stirring rod. Attached Figure Description

[0027] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a three-dimensional structural diagram of the waste liquid tank of this utility model;

[0030] Figure 3 This is a three-dimensional structural diagram of the mounting plate and filter plate of this utility model;

[0031] Figure 4 This is a three-dimensional structural diagram of the connecting rod of this utility model;

[0032] Figure 5 This is a three-dimensional structural diagram of the stirring rod of this utility model;

[0033] Figure 6 This is a three-dimensional structural diagram of the filter plate and the fourth motor of this utility model;

[0034] Figure 7 This is a three-dimensional structural diagram of the first motor and the first stirring shaft of this utility model;

[0035] Wherein: 100-Waste liquid tank, 101-Inlet pipe, 102-Guide channel, 200-Reaction tank, 201-Liquid addition pipe, 202-First motor, 2021-First stirring shaft, 2022-First stirring blade, 300-Connecting pipe, 400-Decomposition tank, 401-Second motor, 402-Exhaust pipe, 403-Blower, 404-Oxygen supply pipe, 500-Ultrafiltration unit, 600-Filter plate, 601-Filter... Filter hole, 602-rotating shaft, 603-connecting rod, 604-stirring rod, 6041-fixed rod, 6042-telescopic rod, 6043-spring, 6044-ball bearing, 605-transmission belt, 606-third motor, 700-mounting plate, 701-slide groove, 702-slide seat, 703-handwheel, 704-lead screw, 800-fourth motor, 801-rope, 802-fixed pulley, 803-limiting block. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0037] 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0042] Example 1

[0043] like Figures 1-7As shown in the figure, this utility model discloses a waste liquid treatment device for coal gas desulfurization, including a waste liquid pool 100, a reaction tank 200, a decomposition tank 400, and an ultrafilter 500 connected sequentially by a connecting pipe 300; one side of the waste liquid pool 100 is connected to an inlet pipe 101, and a filter plate 600 is provided inside the waste liquid pool 100, with a plurality of filter holes 601 penetrating through the filter plate 600; a first stirring shaft 2021 is rotatably connected inside the reaction tank 200, and the stirring shaft is driven by a first motor 202. The first stirring shaft 2021 is provided with a plurality of first stirring blades 2022, and the top of the reaction vessel 200 is connected to a liquid addition pipe 201; a second stirring shaft is rotatably connected inside the decomposition vessel 400, the second stirring shaft is driven by a second motor 401, and the second stirring shaft is provided with a plurality of second stirring blades; a blower 403 is also provided on one side of the decomposition vessel 400, one end of the blower 403 is connected to the decomposition vessel 400 through an oxygen supply pipe 404, and an exhaust pipe 402 is connected to the top of the decomposition vessel 400. It should be noted that the connecting pipe 300 is used to connect the various treatment units in series, and each connecting pipe 300 is equipped with a water pump. The water pump provides water pressure to ensure the orderly flow of waste liquid; the waste liquid tank 100 is used to temporarily store the desulfurization waste liquid to be treated and to perform preliminary filtration; the inlet pipe 101 is responsible for introducing the waste liquid generated by the desulfurization system into the device; the filter plate 600 and filter holes 601 are used to intercept large particulate impurities (such as desulfurization waste residue, fibers, etc.) in the waste liquid; the reaction tank 200 is the main place for the reagent reaction and is used to remove suspended solids, heavy metals and sulfides; the first stirring shaft 2021 and the first stirring blade 2022 are used to stir the waste liquid and reagents to make them fully mixed; the first motor 202 provides power for stirring; the liquid addition pipe 201 is used to add treatment reagents such as polyaluminum chloride, polyacrylamide, sodium hydroxide, and sodium hypochlorite; decomposition Tank 400 is used to decompose chemical oxygen demand and ammonia nitrogen through microbial action; the second stirring shaft and the second stirring blade are used to ensure that the waste liquid is in full contact with oxygen and microorganisms; the second motor 401 provides power for stirring; the blower 403 provides oxygen to meet the metabolic needs of aerobic microorganisms; the oxygen supply pipe 404 delivers oxygen to the decomposition tank 400; the exhaust pipe 402 is used to discharge gases such as carbon dioxide and nitrogen produced by microbial decomposition; the ultrafilter 500 is used for deep filtration to remove residual fine impurities and colloids. The ultrafilter 500 adopts existing technology and will not be described in detail here; Working principle: the coal gas desulfurization waste liquid flows into the waste liquid pool 100 from the inlet pipe 101, first passes through the filter holes 601 of the filter plate 600 to intercept large impurities, and the filtered waste liquid enters the reaction tank 200 through the connecting pipe 300 under the action of the water pump;Polyaluminum chloride, polyacrylamide, sodium hydroxide, and sodium hypochlorite are added sequentially through the addition pipe 201. The first motor 202 drives the first stirring shaft 2021 and the first stirring blade 2022 to rotate, ensuring thorough mixing of the reagents and waste liquid. Polyaluminum chloride and polyacrylamide promote the aggregation of fine suspended matter into flocs. Sodium hydroxide adjusts the pH to 9-10, causing heavy metals to precipitate. Sodium hypochlorite oxidizes toxic sulfides. After the reaction, the mixture is allowed to settle, allowing the flocs and precipitates to settle. The supernatant enters the decomposition tank 400 through the connecting pipe 300. Inside the decomposition tank 400, the second motor 401 drives the second stirring shaft and the second stirring blade to agitate the liquid. Simultaneously, the blower 403 introduces oxygen through the oxygen supply pipe 404, providing oxygen for the aerobic microorganisms to decompose the chemical oxygen demand (COD) in the waste liquid. (Converted into carbon dioxide and water) and ammonia nitrogen is converted into nitrogen gas, which is discharged from exhaust pipe 402; finally, the treated waste liquid enters ultrafiltration 500 for further filtration of residual impurities; in this utility model, the waste liquid tank 100, reaction tank 200, decomposition tank 400 and ultrafiltration 500 are arranged in sequence to realize the whole process treatment of desulfurization waste liquid from preliminary filtration to deep purification; filter plate 600 effectively removes large impurities and avoids clogging of subsequent equipment; stirring structure ensures that the reagent reacts fully with the waste liquid and improves the pollutant removal efficiency; the combination of oxygen supply and stirring enhances microbial activity and improves the decomposition effect of chemical oxygen demand and ammonia nitrogen; ultrafiltration 500 ensures the quality of effluent, and the whole device realizes efficient and continuous waste liquid treatment and reduces pollution emissions.

[0044] Example 2

[0045] like Figures 2-5As shown, this embodiment is largely the same as the above embodiment, except that the filter plate 600 is rotatably connected to a rotating shaft 602, which is driven by a third motor 606. A connecting rod 603 is provided on the side wall of the rotating shaft 602, which is arranged radially along the rotating shaft 602. A plurality of stirring rods 604 are provided at the bottom of the connecting rod 603, and the plurality of stirring rods 604 are spaced apart along the length of the connecting rod 603. It should be noted that the rotating shaft 602 is used to drive the connecting rod 603 and the stirring rod 604 to rotate; the third motor 606 provides power for the rotation of the rotating shaft 602; the connecting rod 603 is used to connect the rotating shaft 602 and the stirring rod 604 to transmit torque; the stirring rod 604 is used to agitate the waste liquid and impurities on the filter plate 600. Working principle: After the third motor 606 starts, it drives the rotating shaft 602 to rotate. The rotating shaft 602 drives the connecting rod 603 and the stirring rod 604 at the bottom to rotate synchronously. When the stirring rod 604 rotates above the filter plate 600, it agitates the waste liquid flowing through the filter plate 600, making it difficult for impurities in the waste liquid to accumulate above the filter holes 601, and at the same time promoting the waste liquid to pass through the filter holes 601 more smoothly. In this solution, the rotation and agitation of the stirring rod 604 effectively prevents the filter holes 601 from being blocked by impurities, improves the filtration efficiency and continuity of the filter plate 600, reduces the frequency of downtime for cleaning due to blockage, and ensures stable operation of the device.

[0046] like Figure 5As shown, in this embodiment, the stirring rod 604 includes a fixed rod 6041 and a telescopic rod 6042. The fixed rod 6041 is fixedly connected to the bottom of the connecting rod 603. The fixed rod 6041 has a cavity inside. One end of the telescopic rod 6042 is located inside the cavity, and the other end slides downward through the fixed rod 6041 to contact the filter plate 600. The telescopic rod 6042 is connected to the fixed rod 6041 by a spring 6043. It should be noted that the fixed rod 6041 provides mounting and sliding support for the telescopic rod 6042; the telescopic rod 6042 can extend and retract relative to the fixed rod 6041 to ensure contact with the filter plate 600; the cavity is used to accommodate the telescopic rod 6042 and the spring 6043; the spring 6043 provides elastic force to the telescopic rod 6042, keeping it always in contact with the filter plate 600; working principle: under the elastic force of the spring 6043, the bottom of the telescopic rod 6042 is always in close contact with the surface of the filter plate 600. When the stirring rod 604 rotates with the rotating shaft 602, the telescopic rod 6042 will slide along the surface of the filter plate 600, scraping off the residue adhering to it. Impurities on the filter plate 600; when the surface of the filter plate 600 is uneven or encounters large impurities, the telescopic rod 6042 and compressible spring 6043 retract into the cavity of the fixed rod 6041 to avoid hard contact that could damage the components. Then, under the elastic force of the spring 6043, the contact with the filter plate 600 is restored. In this solution, the telescopic stirring rod 604 structure can effectively clean the attached impurities on the surface of the filter plate 600, prevent the filter holes 601 from clogging, and adapt to the unevenness of the surface of the filter plate 600 and handle larger impurities, avoiding wear or damage to the components and extending the service life of the filter plate 600 and the stirring rod 604.

[0047] like Figure 5 As shown, in this embodiment, a ball bearing 6044 is movably connected to the bottom of the telescopic rod 6042. It should be noted that the ball bearing 6044 is used to reduce friction between the telescopic rod 6042 and the filter plate 600; when the telescopic rod 6042 rotates with the shaft 602 and moves along the surface of the filter plate 600, the ball bearing 6044 rolls on the surface of the filter plate 600, converting the sliding friction between the telescopic rod 6042 and the filter plate 600 into rolling friction, significantly reducing frictional resistance.

[0048] Example 3

[0049] like Figures 2-6As shown, this embodiment is largely the same as the above embodiment, except that a guide groove 102 is provided on the inner wall of the waste liquid tank 100, the guide groove 102 is arranged along the height direction of the waste liquid tank 100, a guide block is provided on the side wall of the filter plate 600, and the guide block is slidably embedded in the guide groove 102; a fixed pulley 802 is provided on the top of the waste liquid tank 100, the fixed pulley 802 is located above the guide groove 102; a fourth motor 800 is provided on one side of the waste liquid tank 100, a rope 801 is fixedly connected to the output shaft of the fourth motor 800, and the end of the rope 801 away from the fourth motor 800 passes around the fixed pulley 802 and is connected to the guide block. It should be noted that the guide groove 102 and the guide block cooperate to restrict the movement direction of the filter plate 600, ensuring that it rises and falls vertically; the fixed pulley 802 is used to change the direction of force on the rope 801; the fourth motor 800 provides power for the lifting and lowering of the filter plate 600; the rope 801 is used to transmit tension, pulling the filter plate 600 up and down; working principle: when it is necessary to clean impurities on the filter plate 600, the fourth motor 800 rotates forward, winding the rope 801. After the rope 801 passes around the fixed pulley 802, it pulls the guide block to slide upward along the guide groove 102, driving the filter plate 600 to move upward. The filter plate 600 rises to the top of the waste liquid tank 100, exposing impurities. After cleaning, the fourth motor 800 reverses, releasing the rope 801. The filter plate 600 descends along the guide groove 102 under its own gravity, returning to its original position to continue filtration. In this scheme, the fixed pulley 802, rope 801, and fourth motor 800 enable convenient lifting and lowering of the filter plate 600, facilitating the cleaning of large impurities trapped on the filter plate 600 by operators, reducing maintenance difficulty. At the same time, the guide structure ensures the stability of the lifting and lowering of the filter plate 600, preventing deviation from affecting subsequent filtration.

[0050] like Figure 3As shown, in this embodiment, a mounting plate 700 is provided on one side of the waste liquid tank 100, a sliding groove 701 is provided on the top of the mounting plate 700, a sliding seat 702 is slidably embedded in the sliding groove 701, a third motor 606 is mounted on the sliding seat 702, and the output shaft of the third motor 606 is connected to the rotating shaft 602 through a transmission belt 605; a driving device for driving the sliding seat 702 to move is provided on the mounting plate 700. It should be noted that the mounting plate 700 provides a mounting base for the slide groove 701, slide block 702, and drive device; the slide groove 701 and slide block 702 cooperate to allow the third motor 606 to move horizontally; the transmission belt 605 is used to transmit the power of the third motor 606 to the rotating shaft 602, realizing the same motor driving the filter plate 600 to rise and fall and the rotating shaft 602 to rotate; the drive device is used to drive the slide block 702 to move and adjust the position of the third motor 606; working principle: when it is necessary to drive the rotating shaft 602 to rotate, the drive device drives the slide block 702 to move along the slide groove 701, so that the third motor 606 is close to the rotating shaft 602, the transmission belt 605 is tensioned, and the third motor 606 is powered. The drive belt 605 drives the rotating shaft 602 to rotate. When it is necessary to drive the filter plate 600 to rise or fall, the drive device drives the slide 702 to move, so that the third motor 606 is away from the rotating shaft 602, the drive belt 605 loosens, and the operator can remove the drive belt 605 to prevent motion interference when the filter plate 600 rises. In this solution, the third motor 606 is located outside the waste liquid tank 100, which can prevent the waste liquid inside the waste liquid tank 100 from corroding the third motor 606. At the same time, the drive device drives the moving seat to move, so that the drive belt 605 can become loose, making it easy for the operator to remove the drive belt 605 and preventing motion interference when the filter plate 600 is raised or lowered.

[0051] like Figure 3 As shown, in this embodiment, the driving device includes a lead screw 704, the two ends of which are rotatably connected to the two ends of a slide groove 701, and the slide block 702 is threadedly connected to the lead screw 704. It should be noted that when the lead screw 704 is rotated, since the slide block 702 is threadedly connected to the lead screw 704 and is restricted from rotating by the slide groove 701, the slide block 702 will move along the axial direction of the lead screw 704, thereby driving the third motor 606 to move closer to or further away from the rotating shaft 602, adjusting the tension of the transmission belt 605.

[0052] like Figure 3 As shown, in this embodiment, a handwheel 703 is fixedly connected to one end of the lead screw 704. It should be noted that the operator can easily adjust the position of the slide block 702 and thus adjust the tension of the transmission belt 605 by rotating the handwheel 703 to drive the lead screw 704 to rotate without the need for additional tools.

[0053] The working principle of this utility model is as follows:

[0054] The waste liquid generated during the coal gas desulfurization process is first transported to the waste liquid pool 100 through the inlet pipe 101. The filter holes 601 on the filter plate 600 can trap large particulate impurities in the waste liquid, achieving preliminary filtration. At this time, the third motor 606 starts and drives the rotating shaft 602 to rotate through the transmission belt 605. The rotating shaft 602 drives the connecting rod 603 and the bottom stirring rod 604 to rotate synchronously. Under the elastic force of the spring 6043, the telescopic rod 6042 in the stirring rod 604 causes the bottom ball bearing 6044 to make close contact with the surface of the filter plate 600 and roll, which not only scrapes off the impurities attached to the filter plate 600 and prevents the filter holes 601 from clogging, but also adapts to the unevenness of the surface of the filter plate 600 or large impurities through the telescopic characteristics of the telescopic rod 6042, avoiding damage to the components.

[0055] When a large amount of impurities accumulate on the filter plate 600, the handwheel 703 is turned to rotate the lead screw 704, causing the slide block 702 to move along the slide groove 701 of the mounting plate 700. The transmission belt 605 is then loosened and removed to avoid interfering with the lifting and lowering of the filter plate 600. Subsequently, the fourth motor 800 is started, winding up the rope 801. The rope 801 passes around the fixed pulley 802 and pulls the guide block to slide upward along the guide groove 102 on the inner wall of the waste liquid tank 100, lifting the filter plate 600 to the upper part of the waste liquid tank 100 for easy cleaning of impurities by the operator. After cleaning, the fourth motor 800 reverses to release the rope 801, and the filter plate 600 descends and resets along the guide groove 102 under its own gravity to perform filtration again.

[0056] After preliminary filtration, the waste liquid enters the reaction tank 200 under the action of a water pump via connecting pipe 300. Polyaluminum chloride, polyacrylamide, sodium hydroxide, and sodium hypochlorite are added sequentially through the liquid addition pipe 201. The first motor 202 drives the first stirring shaft 2021 and the first stirring blade 2022 to rotate, ensuring thorough mixing of the reagents and waste liquid. Polyaluminum chloride and polyacrylamide promote the aggregation of fine suspended solids into flocs, sodium hydroxide adjusts the pH to 9-10 to precipitate heavy metals, and sodium hypochlorite oxidizes toxic sulfides. After the reaction, the mixture is allowed to stand, allowing the flocs and precipitates to settle. The supernatant then enters the decomposition tank 400 through connecting pipe 300.

[0057] Inside the decomposition tank 400, the second motor 401 drives the second stirring shaft and the second stirring blades to rotate, while the blower 403 introduces oxygen into the tank through the oxygen supply pipe 404, providing a suitable metabolic environment for aerobic microorganisms. Under the action of stirring, the microorganisms come into full contact with the waste liquid, decompose the chemical oxygen demand in the waste liquid (converting it into carbon dioxide and water) and convert ammonia nitrogen into nitrogen gas. The generated gas is discharged through the exhaust pipe 402.

[0058] The waste liquid after decomposition treatment finally enters the ultrafiltration unit 500, where residual fine impurities and colloids are removed through deep filtration to obtain purified water.

[0059] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A waste liquid treatment device for coal gas desulfurization, characterized in that, It includes a waste liquid tank (100), a reaction tank (200), a decomposition tank (400) and an ultrafilter (500) connected in sequence by a connecting pipe (300). The waste liquid tank (100) is connected to an inlet pipe (101) on one side, and a filter plate (600) is provided inside the waste liquid tank (100), and a plurality of filter holes (601) are provided through the filter plate (600). The reaction vessel (200) is rotatably connected to a first stirring shaft (2021), which is driven by a first motor (202). The first stirring shaft (2021) is provided with a plurality of first stirring blades (2022), and the top of the reaction vessel (200) is connected to a liquid addition pipe (201). The decomposition tank (400) is rotatably connected to a second stirring shaft, which is driven by a second motor (401) and has several second stirring blades. A blower (403) is also provided on one side of the decomposition tank (400). One end of the blower (403) is connected to the decomposition tank (400) through an oxygen supply pipe (404). An exhaust pipe (402) is connected to the top of the decomposition tank (400).

2. The waste liquid treatment device for coal gas desulfurization according to claim 1, characterized in that, The filter plate (600) is rotatably connected to a rotating shaft (602) at its center. The rotating shaft (602) is driven by a third motor (606). A connecting rod (603) is provided on the side wall of the rotating shaft (602). The connecting rod (603) is arranged radially along the rotating shaft (602). A plurality of stirring rods (604) are provided at the bottom of the connecting rod (603). The plurality of stirring rods (604) are spaced apart along the length direction of the connecting rod (603).

3. The waste liquid treatment device for coal gas desulfurization according to claim 2, characterized in that, The stirring rod (604) includes a fixed rod (6041) and a telescopic rod (6042). The fixed rod (6041) is fixedly connected to the bottom of the connecting rod (603). The fixed rod (6041) has a cavity inside. One end of the telescopic rod (6042) is located inside the cavity, and the other end slides downward to the outside of the fixed rod (6041) to contact the filter plate (600). The telescopic rod (6042) is connected to the fixed rod (6041) by a spring (6043).

4. The waste liquid treatment device for coal gas desulfurization according to claim 3, characterized in that, The bottom of the telescopic rod (6042) is movably connected to a ball bearing (6044).

5. The waste liquid treatment device for coal gas desulfurization according to claim 2, characterized in that, The waste liquid tank (100) has a guide groove (102) on its inner wall. The guide groove (102) is arranged along the height direction of the waste liquid tank (100). The filter plate (600) has a guide block on its side wall. The guide block is slidably embedded in the guide groove (102). The waste liquid tank (100) is provided with a fixed pulley (802) at the top, and the fixed pulley (802) is located above the guide groove (102); A fourth motor (800) is provided on one side of the waste liquid tank (100). A rope (801) is fixedly connected to the output shaft of the fourth motor (800). The end of the rope (801) away from the fourth motor (800) passes around the fixed pulley (802) and is connected to the guide block.

6. The waste liquid treatment device for coal gas desulfurization according to claim 5, characterized in that, The waste liquid tank (100) is provided with an installation plate (700) on one side, and a sliding groove (701) is provided on the top of the installation plate (700). A sliding seat (702) is slidably embedded in the sliding groove (701). The third motor (606) is installed on the sliding seat (702), and the output shaft of the third motor (606) is connected to the rotating shaft (602) through a transmission belt (605). The mounting plate (700) is provided with a drive device for moving the slide (702).

7. The waste liquid treatment device for coal gas desulfurization according to claim 6, characterized in that, The driving device includes a lead screw (704), the two ends of which are rotatably connected to the two ends of a slide groove (701), and the slide block (702) is threadedly connected to the lead screw (704).

8. The waste liquid treatment device for coal gas desulfurization according to claim 7, characterized in that, A handwheel (703) is fixedly connected to one end of the lead screw (704).

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