Combined purifier for calcium desulfurization wastewater

Abstract

This invention relates to the field of desulfurization wastewater treatment technology, specifically to a combined purification device for calcium-based desulfurization wastewater. The device includes a neutralization reaction tank, a flocculation reaction tank, a filter tank, four wall-scraping mechanisms, four stirring mechanisms, two rotating mechanisms, and two spraying mechanisms. The flocculation reaction tank and the neutralization reaction tank are connected via a conveying pipe. The neutralization reaction tank is used for neutralization and sedimentation treatment of the desulfurization wastewater, while the flocculation reaction tank is used for flocculation and sedimentation treatment. The filter tank is connected to the flocculation reaction tank via a conveying pipe and is used for filtration treatment of the desulfurization wastewater. The two spraying mechanisms are respectively fixedly installed on the neutralization reaction tank and the flocculation reaction tank. This combined purification device for calcium-based desulfurization wastewater, through the rotating, wall-scraping, and spraying mechanisms, drives the wall-scraping plates to scrape away the scale layer on the inner walls of the neutralization and flocculation reaction tanks, improving the purification device's effectiveness and service life.

Description

Technical Field

[0001] This invention relates to the field of desulfurization wastewater treatment technology, specifically to a combined purification device for calcium-based desulfurization wastewater. Background Technology

[0002] Calcium-based desulfurization is a widely used flue gas desulfurization technology in the industrial field. It mainly utilizes calcium-based compounds to chemically react with sulfur dioxide in flue gas, converting sulfur dioxide into solid products such as calcium sulfite, calcium sulfate, and calcium sulfate, thereby achieving the purpose of removing sulfur dioxide from flue gas and reducing sulfur dioxide emissions to pollute the atmospheric environment. The calcium-based desulfurization process generates a large amount of wastewater, which contains high concentrations of suspended solids, heavy metal ions, chloride ions, and sulfate ions. The wastewater is difficult to treat and requires a specialized combined purification device.

[0003] The combined purification device for calcium desulfurization wastewater is a specialized device for treating wastewater generated during the calcium desulfurization process. The combined purification device mainly consists of a neutralization and sedimentation unit, a flocculation and sedimentation unit, and a filtration unit. The neutralization and sedimentation unit adjusts the pH of the wastewater to a suitable range by adding alkaline agents to facilitate sedimentation. The flocculation and sedimentation unit adds flocculants to the neutralized and sedimentated wastewater in a flocculation reaction tank for further sedimentation. Finally, the flocculated and sedimentated wastewater enters the filtration unit for further purification.

[0004] However, considering that existing combined purification devices contain high concentrations of calcium, magnesium and other metal ions in the wastewater from calcium-based desulfurization, these ions easily form scale layers such as carbonates and sulfates on the inner wall of the equipment during the treatment process. Scale formation reduces the heat transfer efficiency, sedimentation effect and reaction effect of the equipment, affecting the normal operation of the device. At the same time, it is difficult to completely remove the scale layer manually and it increases the workload of the staff, thus reducing the effectiveness and service life of the purification device. Summary of the Invention

[0005] The purpose of this invention is to provide a combined purification device for calcium desulfurization wastewater.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A combined purification device for calcium-based desulfurization wastewater is provided, comprising a neutralization reaction tank, a flocculation reaction tank, a filter tank, four wall scraping mechanisms, four stirring mechanisms, two rotating mechanisms, and two spraying mechanisms. The flocculation reaction tank and the neutralization reaction tank are connected by a conveying pipe. The neutralization reaction tank is used for neutralization and sedimentation treatment of the desulfurization wastewater, and the flocculation reaction tank is used for flocculation and sedimentation treatment of the desulfurization wastewater. The filter tank is connected to the flocculation reaction tank by a conveying pipe and is used for filtration treatment of the desulfurization wastewater. The two spraying mechanisms are respectively fixedly installed on the neutralization reaction tank and the flocculation reaction tank, and are used to spray the reaction agents into the neutralization reaction tank or the flocculation reaction tank. The two rotating mechanisms are respectively fixedly installed on the inner side of the neutralization reaction tank and the flocculation reaction tank, and are used to drive the wall scraping mechanism and the stirring mechanism to rotate. The four wall scraping mechanisms are used to clean the inner walls of the neutralization reaction tank and the flocculation reaction tank, and the four stirring mechanisms are used to stir the desulfurization wastewater and the reaction agents inside the neutralization reaction tank and the flocculation reaction tank, respectively.

[0008] Furthermore, each scraping mechanism includes a scraping plate, a moving block, an L-shaped rod, and a cleaning mechanism. The scraping plate is connected to the rotating mechanism via a bottom rod and a top rod, and the upper and lower ends of the scraping plate are rotatably connected to the bottom rod and the top rod, respectively. The rotating mechanism is used to drive the bottom rod and the top rod to rotate around the axis of the rotating mechanism. The scraping plate is connected to the moving block via a hinge rod, and the two ends of the hinge rod are hinged to the scraping plate and the moving block, respectively. The L-shaped rod has a sloping groove, and the L-shaped rod is connected to the moving block via a T-shaped rod, and the T-shaped rod is slidably connected to the inner side of the sloping groove. The L-shaped rod is rotatably mounted on the spraying mechanism, which is used to drive the L-shaped rod to move vertically. The cleaning mechanism is slidably mounted on the scraping plate and is used to clean the scraping plate.

[0009] Furthermore, the cleaning mechanism includes a cleaning rod and two movable rods. A groove is provided on the scraper plate, and the cleaning rod is slidably connected to the groove. The two movable rods are respectively hinged to the upper and lower ends of the cleaning rod. One movable rod is hinged to the bottom rod, and the other movable rod is hinged to the top rod.

[0010] Furthermore, each stirring mechanism includes multiple stirring blades, a connecting rod, multiple rotating shafts, and a gear. The multiple rotating shafts are fixedly installed on the multiple stirring blades, and the multiple rotating shafts are rotatably installed on the rotating mechanism. The rotating mechanism is used to drive the multiple rotating shafts to rotate around the axis of the rotating mechanism. Each of the multiple stirring blades is fixedly connected to a fixed column, and the multiple fixed columns are rotatably installed on the connecting rod. The gear is fixedly installed on a rotating shaft near the top of the rotating mechanism.

[0011] Furthermore, each rotating mechanism includes a rotating column, a guide column, a collar, and a motor. The rotating column is rotatably mounted on the neutralization reaction chamber. The guide column is fixedly mounted on the rotating column and slidably connected to the moving block. The collar is fixedly mounted on the rotating column and fixedly connected to the top rod. The collar is slidably connected to the L-shaped rod. The bottom end of the rotating column is fixedly connected to the bottom rod. The rotating column is rotatably connected to the rotating shaft. The motor is fixedly mounted at the bottom of the neutralization reaction chamber, and the output shaft of the motor is fixedly connected to the rotating column.

[0012] Furthermore, each spraying mechanism includes a reagent box, a connecting pipe, a housing, and multiple nozzles. The reagent box is fixedly installed on the neutralization reaction chamber. One end of the connecting pipe is fixedly installed on the reagent box, and the other end of the connecting pipe passes through and is fixedly installed on the inside of the neutralization reaction chamber. The connecting pipe is connected to the housing via a flexible hose, and the multiple nozzles are all fixedly installed on the housing.

[0013] Furthermore, each spraying mechanism also includes a cylindrical rod, a fixed plate, an electric telescopic rod, and a toothed ring. The cylindrical rod is fixedly installed on the housing and extends through the top of the neutralization reaction chamber. The fixed plate is fixedly installed on the top of the cylindrical rod. The electric telescopic rod is fixedly installed on the top of the neutralization reaction chamber, and its output end is fixedly connected to the fixed plate. The toothed ring is fixedly installed on the bottom of the housing, meshes with a gear, and is rotatably connected to an L-shaped rod.

[0014] The beneficial effects of this invention are as follows: This combined purification device for calcium-based desulfurization wastewater, through its rotating mechanism, wall-hanging mechanism, and spraying mechanism, enables the scraper plate to rotate and contact the inner wall of the neutralization or flocculation reaction tank, thus scraping away the scale layer on the inner wall and improving the effectiveness and service life of the purification device. Simultaneously, the cleaning mechanism within the scraping mechanism cleans the side of the scraper plate that has been scraped of scale during rotation, thus self-cleaning the scraper plate and preventing its scraping and cleaning effect from being affected after prolonged use. Furthermore, the stirring mechanism allows multiple sets of stirring blades to rotate simultaneously around the rotating column, improving the stirring effect and further enhancing the mixing effect and efficiency of the wastewater and reagents, thereby further improving the effectiveness and efficiency of the purification device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic cross-sectional view of the neutralization reaction chamber of the present invention;

[0018] Figure 3 This is a schematic diagram of the main structure of the rotating mechanism of the present invention;

[0019] Figure 4 This is a schematic diagram of the main structure of the scraping mechanism of the present invention;

[0020] Figure 5 This is a schematic diagram of the inclined state structure of the scraper plate of the present invention;

[0021] Figure 6 This is a schematic diagram of the disassembled structure of the scraping mechanism of the present invention;

[0022] Figure 7 This is a schematic diagram of the main structure of the cleaning mechanism of the present invention;

[0023] Figure 8 This is a schematic diagram of the disassembled structure of the stirring mechanism of the present invention;

[0024] Figure 9 For the present invention Figure 3 Enlarged structural diagram of section B;

[0025] Figure 10 This is a schematic diagram of the main structure of the stirring blade of the present invention;

[0026] Figure 11 For the present invention Figure 2 Enlarged structural diagram of section A.

[0027] In the diagram: 1. Neutralization reaction chamber; 2. Flocculation reaction chamber; 3. Filter chamber; 4. Scraping mechanism; 41. Scraping plate; 42. Bottom rod; 43. Top rod; 44. Hinge rod; 45. Moving block; 46. L-shaped rod; 47. Inclined chute; 48. T-shaped rod; 49. Cleaning mechanism; 491. Cleaning rod; 492. Moving rod; 493. Slide chute; 5. Stirring mechanism; 51. Stirring blade; 52. Connecting rod; 53. Rotating shaft; 54. Gear; 55. Fixed column; 6. Rotating mechanism; 61. Rotating column; 62. Guide column; 63. Collar; 64. Motor; 7. Spraying mechanism; 71. Agent box; 72. Connecting pipe; 73. Hose; 74. Shell; 75. Cylindrical rod; 76. Fixed plate; 77. Electric telescopic rod; 78. Gear ring; 79. Nozzle. Detailed Implementation

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0030] Reference Figures 1 to 3 The diagram shows a combined purification device for calcium-based desulfurization wastewater, comprising a neutralization reaction tank 1, a flocculation reaction tank 2, a filter tank 3, four wall scraping mechanisms 4, four stirring mechanisms 5, two rotating mechanisms 6, and two spraying mechanisms 7. The flocculation reaction tank 2 and the neutralization reaction tank 1 are connected by a conveying pipe. The neutralization reaction tank 1 is used for neutralization and sedimentation treatment of the desulfurization wastewater. By adding alkaline agents to the neutralization reaction tank 1, the pH value of the wastewater is adjusted, causing heavy metal ions in the wastewater to combine with hydroxide ions to form insoluble hydroxides for precipitation and purification. The supernatant in the neutralization reaction tank 1 is conveyed to the flocculation reaction tank 2 through the conveying pipe between the flocculation reaction tank 2 and the neutralization reaction tank 1. A water inlet pipe is installed at the top of the neutralization reaction tank 1, through which wastewater is conveyed to the neutralization reaction tank 1. Flocculation reaction tank 2 is used for flocculation reaction and sedimentation treatment of desulfurization wastewater. By adding flocculant to flocculation reaction tank 2, the flocculant will cause the remaining fine suspended solids and colloidal particles in the wastewater to agglomerate into larger flocs for sedimentation and purification. Both flocculation reaction tank 2 and neutralization reaction tank 1 are equipped with discharge pipes at their bottom ends to discharge the flocs and sludge settled in flocculation reaction tank 2 and neutralization reaction tank 1. Filter tank 3 is connected to flocculation reaction tank 2 via a conveying pipe. Filter tank 3 is used for filtering desulfurization wastewater. The supernatant in flocculation reaction tank 2 is transported to filter tank 3 through the conveying pipe between filter tank 3 and flocculation reaction tank 2. Filter tank 3 is equipped with an outlet pipe at its bottom end to discharge the filtered wastewater.

[0031] Reference Figures 1 to 3 Two spraying mechanisms 7 are fixedly installed on the neutralization reaction chamber 1 and the flocculation reaction chamber 2, respectively. The spraying mechanisms 7 are used to spray the reaction agent into the neutralization reaction chamber 1 or the flocculation reaction chamber 2, ensuring even spraying. Two rotating mechanisms 6 are fixedly installed on the inner sides of the neutralization reaction chamber 1 and the flocculation reaction chamber 2, respectively. The rotating mechanisms 6 drive the wall scraping mechanism 4 and the stirring mechanism 5 to rotate. The four wall scraping mechanisms 4 are used to clean the inner walls of the neutralization reaction chamber 1 and the flocculation reaction chamber 2. The four wall scraping mechanisms 4 are staggered in pairs within the neutralization reaction chamber 1 and the flocculation reaction chamber 2, thereby improving the service life and effectiveness of the neutralization reaction chamber 1 and the flocculation reaction chamber 2. Four stirring mechanisms 5 are used to stir the desulfurization wastewater and reagents inside the neutralization reaction tank 1 and the flocculation reaction tank 2, respectively. The four stirring mechanisms 5 are distributed alternately in the neutralization reaction tank 1 and the flocculation reaction tank 2. Through the stirring mechanisms 5, the desulfurization wastewater and reagents inside the neutralization reaction tank 1 and the flocculation reaction tank 2 can be mixed more evenly, avoiding over-stirring and insufficient stirring.

[0032] Reference Figures 3 to 6Each scraping mechanism 4 includes a scraping plate 41, a moving block 45, an L-shaped rod 46, and a cleaning mechanism 49. The scraping plate 41 is connected to the rotating mechanism 6 via a bottom rod 42 and a top rod 43. The upper and lower ends of the scraping plate 41 are rotatably connected to the bottom rod 42 and the top rod 43, respectively. The surface of the scraping plate 41 that contacts the inner wall of the neutralization reaction tank 1 or the flocculation reaction tank 2 is beveled, making it easier to scrape off the scale layer. The rotating mechanism 6 drives the bottom rod 42 and the top rod 43 to rotate around the axis of the rotating mechanism 6. By driving the bottom rod 42 and the top rod 43 to rotate, the scraping plate 41 can be driven to rotate around the axis of the rotating mechanism 6. The scraping plate 41 is connected to the moving block 45 via a hinge rod 44. The two ends of the hinge rod 44 are hinged to the scraping plate 41 and the moving block 45, respectively. The movement of the moving block 45 can drive the scraping plate 41 to rotate around the axis of the rotating mechanism 6. The movable hinge rod 44 moves, thereby causing the scraper plate 41 to rotate, so that the scraper plate 41 contacts or releases contact with the inner wall of the neutralization reaction box 1 or the flocculation reaction box 2. The L-shaped rod 46 has a sloping groove 47. The L-shaped rod 46 and the moving block 45 are connected by a T-shaped rod 48, and the T-shaped rod 48 is slidably connected to the inner side of the sloping groove 47. The L-shaped rod 46 is rotatably mounted on the spraying mechanism 7. The spraying mechanism 7 is used to drive the L-shaped rod 46 to move vertically. Through the movement of the L-shaped rod 46, the T-shaped rod 48 can slide along the inner wall of the sloping groove 47, thereby driving the moving block 45 to slide along the guide post 62. The cleaning mechanism 49 is slidably mounted on the scraper plate 41. The cleaning mechanism 49 is used to clean the scraper plate 41 to prevent dirt from adhering to the sloping blade surface after long-term use, which would affect the scraping and cleaning effect.

[0033] Reference Figure 4 and Figure 7 The cleaning mechanism 49 includes a cleaning rod 491 and two moving rods 492. The scraper plate 41 has a groove 493. The cleaning rod 491 is slidably connected to the groove 493. One side of the cleaning rod 491 is inclined, which can better remove the attached materials on the scraper plate 41. The two moving rods 492 are respectively hinged to the upper and lower ends of the cleaning rod 491. One moving rod 492 is hinged to the bottom rod 42, and the other moving rod 492 is hinged to the top rod 43. Through the hinge effect of the two moving rods 492, when the scraper plate 41 rotates, it can drive the cleaning rod 491 to slide along the groove 493, so that the cleaning rod 491 can remove and clean the attached materials on the scraper plate 41.

[0034] Reference Figures 8 to 10Each stirring mechanism 5 includes multiple stirring blades 51, connecting rods 52, multiple rotating shafts 53, and gears 54. The multiple rotating shafts 53 are fixedly mounted on the multiple stirring blades 51. Multiple through holes are provided on the stirring blades 51 to reduce resistance during rotation, improve liquid flow, and enhance the stirring effect. The multiple rotating shafts 53 are rotatably mounted on a rotating mechanism 6. The rotation of the rotating shafts 53 causes the stirring blades 51 to rotate. The rotating mechanism 6 drives the multiple rotating shafts 53 to rotate around its axis. The rotating mechanism 6 has multiple stirring blades 51, each with a fixed post 55. The fixed posts 55 are rotatably mounted on the connecting rod 52. When one stirring blade 51 rotates, it can drive the connecting rod 52 to move, thereby causing the other stirring blades 51 to rotate. The gear 54 is fixedly mounted on a rotating shaft 53 near the top of the rotating mechanism 6. When the gear 54 meshes with the gear ring 78, the rotating mechanism 6 drives the rotating shaft 53 to rotate, which in turn causes the stirring blades 51 to rotate.

[0035] Reference Figures 2 to 4 Each rotating mechanism 6 includes a rotating column 61, a guide column 62, a collar 63, and a motor 64. The rotating column 61 is rotatably mounted on the neutralization reaction tank 1. Through the rotation of the rotating column 61, the guide column 62, the collar 63, the base rod 42, and the rotating shaft 53 can be driven to rotate simultaneously. The guide column 62 is fixedly mounted on the rotating column 61 and is slidably connected to the moving block 45. The guide column 62 guides the moving block 45 to prevent it from shifting during movement. The collar 63 is fixedly mounted on the rotating column 61. On the rotating column 61, the collar 63 is fixedly connected to the top rod 43. The rotation of the collar 63 can drive the top rod 43 to rotate. The collar 63 is slidably connected to the L-shaped rod 46 and guides the L-shaped rod 46. The bottom end of the rotating column 61 is fixedly connected to the bottom rod 42. The rotating column 61 is rotatably connected to the rotating shaft 53. The motor 64 is fixedly installed at the bottom of the neutralization reaction box 1. The output shaft of the motor 64 is fixedly connected to the rotating column 61. By starting the motor 64, the rotating column 61 can be driven to rotate.

[0036] Reference Figure 2 and Figure 11Each spraying mechanism 7 includes a reagent box 71, a connecting pipe 72, a housing 74, and multiple nozzles 79. The reagent box 71 is fixedly installed on the neutralization reaction chamber 1 and contains alkaline reagent. The reagent box 71 installed on the flocculation reaction chamber 2 contains flocculant. One end of the connecting pipe 72 is fixedly installed on the reagent box 71, and the other end of the connecting pipe 72 passes through and is fixedly installed on the inside of the neutralization reaction chamber 1. The reagent in the reagent box 71 is transported to the hose 73 through the connecting pipe 72. The connecting pipe 72 is connected to the housing 74 through the hose 73. The reagent is transported to the housing 74 through the hose 73. The housing 74 is annular. Multiple nozzles 79 are fixedly installed on the housing 74 and are arranged in a ring array on the housing 74. The multiple nozzles 79 make the reagent in the housing 74 evenly sprayed into the desulfurization wastewater through the multiple nozzles 79.

[0037] Reference Figure 11 Each spraying mechanism 7 also includes a cylindrical rod 75, a fixing plate 76, an electric telescopic rod 77, and a toothed ring 78. The cylindrical rod 75 is fixedly installed on the housing 74 and passes through the top of the neutralization reaction chamber 1. The movement of the cylindrical rod 75 drives the housing 74 to move vertically. The fixing plate 76 is fixedly installed on the top of the cylindrical rod 75. The movement of the fixing plate 76 drives the cylindrical rod 75 to move vertically. The electric telescopic rod 77 is fixedly installed on the top of the neutralization reaction chamber 1. The output end is fixedly connected to the fixed plate 76. By activating the electric telescopic rod 77, the fixed plate 76 can be moved vertically. The gear ring 78 is fixedly installed at the bottom of the housing 74. The movement of the housing 74 drives the gear ring 78 to move vertically. The gear ring 78 meshes with the gear 54. The movement of the gear ring 78 allows the gear ring 78 to mesh with or disengage from the gear 54. The gear ring 78 is rotatably connected to the L-shaped rod 46. The vertical movement of the gear ring 78 drives the L-shaped rod 46 to move vertically.

[0038] This combined purification device for calcium-based desulfurization wastewater utilizes a rotating mechanism, a wall-mounting mechanism, and a spraying mechanism. These mechanisms cause the scraper blades to rotate and contact the inner walls of the neutralization or flocculation reaction tanks, scraping away scale buildup and improving the device's effectiveness and lifespan. Simultaneously, a cleaning mechanism within the scraping mechanism cleans the scraped-off side of the scraper blades during rotation, ensuring self-cleaning and preventing damage to the scraper's cleaning performance over time. Furthermore, the agitation mechanism allows multiple sets of agitator blades to rotate around the rotating column while simultaneously rotating on their own axis, enhancing the mixing effect and efficiency of the wastewater and reagents. This further improves the overall effectiveness and efficiency of the purification device.

[0039] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A combined purification device for calcium-based desulfurization wastewater, characterized in that, The system includes a neutralization reaction tank (1), a flocculation reaction tank (2), a filter tank (3), four wall scraping mechanisms (4), four stirring mechanisms (5), two rotating mechanisms (6), and two spraying mechanisms (7). The flocculation reaction tank (2) is connected to the neutralization reaction tank (1) via a conveying pipe. The neutralization reaction tank (1) is used for neutralization and sedimentation treatment of desulfurization wastewater. The flocculation reaction tank (2) is used for flocculation and sedimentation treatment of desulfurization wastewater. The filter tank (3) is connected to the flocculation reaction tank (2) via a conveying pipe. The filter tank (3) is used for filtration treatment of desulfurization wastewater. The two spraying mechanisms (7) are respectively fixed. Installed on the neutralization reaction tank (1) and the flocculation reaction tank (2), the spraying mechanism (7) is used to spray the reaction agent into the neutralization reaction tank (1) or the flocculation reaction tank (2). The two rotating mechanisms (6) are respectively fixedly installed on the inner side of the neutralization reaction tank (1) and the flocculation reaction tank (2). The rotating mechanism (6) is used to drive the wall scraping mechanism (4) and the stirring mechanism (5) to rotate. The four wall scraping mechanisms (4) are respectively used to clean the inner wall of the neutralization reaction tank (1) and the flocculation reaction tank (2). The four stirring mechanisms (5) are respectively used to stir the desulfurization wastewater and the agent inside the neutralization reaction tank (1) and the flocculation reaction tank (2). Each of the scraping mechanisms (4) includes a scraping plate (41), a moving block (45), an L-shaped rod (46), and a cleaning mechanism (49). The scraping plate (41) is connected to the rotating mechanism (6) via a bottom rod (42) and a top rod (43), and the upper and lower ends of the scraping plate (41) are rotatably connected to the bottom rod (42) and the top rod (43), respectively. The rotating mechanism (6) is used to drive the bottom rod (42) and the top rod (43) to rotate around the axis of the rotating mechanism (6). The scraping plate (41) is connected to the moving block (45) via a hinge rod (44), and the two ends of the hinge rod (44) are connected to each other. The ends are respectively hinged to the scraper plate (41) and the moving block (45). The L-shaped rod (46) is provided with a slanted groove (47). The L-shaped rod (46) and the moving block (45) are connected by a T-shaped rod (48), and the T-shaped rod (48) is slidably connected to the inner side of the slanted groove (47). The L-shaped rod (46) is rotatably mounted on the spraying mechanism (7). The spraying mechanism (7) is used to drive the L-shaped rod (46) to move vertically. The cleaning mechanism (49) is slidably mounted on the scraper plate (41). The cleaning mechanism (49) is used to clean the scraper plate (41). The cleaning mechanism (49) includes a cleaning rod (491) and two moving rods (492). The scraper plate (41) is provided with a sliding groove (493). The cleaning rod (491) is slidably connected to the sliding groove (493). The two moving rods (492) are respectively hinged to the upper and lower ends of the cleaning rod (491). One moving rod (492) is hinged to the bottom rod (42), and the other moving rod (492) is hinged to the top rod (43).

2. The combined purification device for calcium desulfurization wastewater according to claim 1, characterized in that, Each of the stirring mechanisms (5) includes multiple stirring blades (51), connecting rods (52), multiple rotating shafts (53) and gears (54). The multiple rotating shafts (53) are respectively fixedly installed on the multiple stirring blades (51). The multiple rotating shafts (53) are rotatably installed on the rotating mechanism (6). The rotating mechanism (6) is used to drive the multiple rotating shafts (53) to rotate around the axis of the rotating mechanism (6). Each of the multiple stirring blades (51) is fixedly connected to a fixing column (55). The multiple fixing columns (55) are rotatably installed on the connecting rods (52). The gears (54) are fixedly installed on a rotating shaft (53) near the top of the rotating mechanism (6).

3. The combined purification device for calcium desulfurization wastewater according to claim 2, characterized in that, Each of the rotating mechanisms (6) includes a rotating column (61), a guide column (62), a collar (63), and a motor (64). The rotating column (61) is rotatably mounted on the neutralization reaction chamber (1). The guide column (62) is fixedly mounted on the rotating column (61) and is slidably connected to the moving block (45). The collar (63) is fixedly mounted on the rotating column (61) and is fixedly connected to the top rod (43). The collar (63) is slidably connected to the L-shaped rod (46). The bottom end of the rotating column (61) is fixedly connected to the bottom rod (42). The rotating column (61) is rotatably connected to the rotating shaft (53). The motor (64) is fixedly mounted on the bottom of the neutralization reaction chamber (1) and the output shaft of the motor (64) is fixedly connected to the rotating column (61).

4. The combined purification device for calcium desulfurization wastewater according to claim 1, characterized in that, Each of the spraying mechanisms (7) includes a reagent box (71), a connecting pipe (72), a housing (74), and a plurality of nozzles (79). The reagent box (71) is fixedly installed on the neutralization reaction chamber (1). One end of the connecting pipe (72) is fixedly installed on the reagent box (71), and the other end of the connecting pipe (72) passes through and is fixedly installed on the inside of the neutralization reaction chamber (1). The connecting pipe (72) is connected to the housing (74) through a hose (73). The plurality of nozzles (79) are fixedly installed on the housing (74).

5. The combined purification device for calcium desulfurization wastewater according to claim 4, characterized in that, Each of the spraying mechanisms (7) further includes a cylindrical rod (75), a fixed plate (76), an electric telescopic rod (77), and a toothed ring (78). The cylindrical rod (75) is fixedly installed on the housing (74) and passes through the top of the neutralization reaction chamber (1). The fixed plate (76) is fixedly installed on the top of the cylindrical rod (75). The electric telescopic rod (77) is fixedly installed on the top of the neutralization reaction chamber (1). The output end of the electric telescopic rod (77) is fixedly connected to the fixed plate (76). The toothed ring (78) is fixedly installed on the bottom of the housing (74). The toothed ring (78) meshes with the gear (54) and is rotatably connected to the L-shaped rod (46).

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