Combined purification device for calcium desulfurization wastewater

Abstract

The invention relates to the technical field of desulfurization wastewater treatment, in particular to a combined purification device for calcium desulfurization wastewater, which comprises a neutralization reaction box, a flocculation reaction box, a filter box, four wall scraping mechanisms, four stirring mechanisms, two rotating mechanisms and two spraying mechanisms, the neutralization reaction box is used for carrying out neutralization reaction and sedimentation treatment on the desulfurization wastewater, the flocculation reaction box is used for carrying out flocculation reaction and sedimentation treatment on the desulfurization wastewater, the filter box is communicated with the flocculation reaction box through a conveying pipe, and the filter box is used for filtering the desulfurization wastewater; the two spraying mechanisms are fixedly mounted on the neutralization reaction box and the flocculation reaction box respectively. According to the combined purification device for the calcium desulfurization wastewater, the rotating mechanism, the wall hanging mechanism and the spraying mechanism are arranged to drive the wall scraping plate to scrape scale layers on the inner walls of the neutralization reaction box and the flocculation reaction box, so that the use effect of the purification device is improved, and the service life of the purification device is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of desulfurization wastewater treatment, and in particular to a combined purification device for calcium-process desulfurization wastewater. Background Art

[0002] Calcium desulfurization is a flue gas desulfurization technology widely used in the industrial field. It mainly uses calcium-based compounds to react chemically with sulfur dioxide in the flue gas to convert sulfur dioxide into solid products such as calcium sulfite, calcium sulfate and calcium sulfate, thereby achieving the purpose of removing sulfur dioxide from the flue gas and reducing the pollution of sulfur dioxide emissions to the atmospheric environment. The calcium desulfurization process will produce 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 special combined purification device for treatment.

[0003] The combined purification device for calcium-based desulfurization wastewater is a device specially used to treat wastewater generated in the calcium-based desulfurization process. The combined purification device mainly includes a neutralization sedimentation unit, a flocculation sedimentation unit and a filtration unit. The neutralization sedimentation unit adjusts the pH value of the wastewater to a suitable range for precipitation by adding alkaline agents to the wastewater. The flocculation sedimentation unit adds flocculants to the neutralized and precipitated wastewater in the flocculation reaction tank for precipitation. Subsequently, the wastewater after flocculation sedimentation enters the filtration unit for further purification of the wastewater.

[0004] Considering that the existing combined purification device contains high concentrations of metal ions such as calcium and magnesium in the calcium desulfurization wastewater during use, these ions are prone to form carbonate, sulfate and other scale layers on the inner wall of the equipment during the treatment process. Scaling will reduce the heat transfer efficiency, precipitation effect and reaction effect of the equipment, affecting the normal operation of the device. At the same time, it is difficult to completely clean the scale layer by manual cleaning, and the workload of the staff is increased, resulting in reduced use effect and service life of the purification device. Summary of the invention

[0005] The object of the present invention is to provide a combined purification device for calcium-process desulfurization wastewater.

[0006] To achieve this object, the present invention adopts the following technical solutions: Provided is a combined purification device for calcium process desulfurization wastewater, comprising a neutralization reaction box, a flocculation reaction box, a filter box, four wall scraping mechanisms, four stirring mechanisms, two rotating mechanisms and two spraying mechanisms. The flocculation reaction box is connected with the neutralization reaction box through a conveying pipe. The neutralization reaction box is used for neutralization reaction and sedimentation treatment of desulfurization wastewater. The flocculation reaction box is used for flocculation reaction and sedimentation treatment of desulfurization wastewater. The filter box is connected with the flocculation reaction box through a conveying pipe. The filter box is used for filtering desulfurization wastewater. Two spraying mechanisms are respectively fixedly installed on the neutralization reaction box and the flocculation reaction box. The spraying mechanism is used for spraying reaction reagents into the neutralization reaction box or the flocculation reaction box. Two rotating mechanisms are respectively fixedly installed on the inner sides of the neutralization reaction box and the flocculation reaction box. The rotating mechanism is used for driving the wall scraping mechanism and the stirring mechanism to rotate. The four wall scraping mechanisms are respectively used for cleaning the inner walls of the neutralization reaction box and the flocculation reaction box. The four stirring mechanisms are respectively used for stirring the desulfurization wastewater and reagents inside the neutralization reaction box and the flocculation reaction box.

[0007] Furthermore, each scraper mechanism includes a scraper plate, a moving block, an L-shaped rod and a cleaning mechanism. The scraper plate is connected to the rotating mechanism through a bottom rod and a top rod, and the upper and lower ends of the scraper 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 scraper plate and the moving block are connected through a hinge rod, and the two ends of the hinge rod are hinged to the scraper plate and the moving block respectively. An inclined groove is provided on the L-shaped rod, and the L-shaped rod is connected to the moving block through a T-shaped rod, and the T-shaped rod is slidably connected to the inner side of the inclined groove. The L-shaped rod can be rotatably installed on the spraying mechanism, and the spraying mechanism is used to drive the L-shaped rod to move vertically. The cleaning mechanism can be slidably installed on the scraper plate, and the cleaning mechanism is used to clean the scraper plate.

[0008] Furthermore, the cleaning mechanism includes a cleaning rod and two movable rods. A sliding groove is opened on the scraper plate. The cleaning rod is slidably connected to the sliding 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.

[0009] Furthermore, each stirring mechanism includes multiple stirring blades, connecting rods, multiple rotating shafts and gears. The multiple rotating shafts are respectively fixedly installed on the multiple stirring blades. 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. The multiple stirring blades are fixedly connected with fixed columns, and the multiple fixed columns are rotatably installed on the connecting rods. The gears are fixedly installed on a rotating shaft near the top of the rotating mechanism.

[0010] Furthermore, each rotating mechanism includes a rotating column, a guide column, a collar and a motor. The rotating column can be rotatably installed on the neutralization reaction box, the guide column is fixedly installed on the rotating column, the guide column is slidably connected to the moving block, the collar is fixedly installed on the rotating column, the collar is 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 installed at the bottom of the neutralization reaction box, and the output shaft of the motor is fixedly connected to the rotating column.

[0011] Furthermore, each spraying mechanism includes a medicine box, a connecting pipe, a shell and multiple nozzles. The medicine box is fixedly installed on the neutralization reaction box, one end of the connecting pipe is fixedly installed on the medicine box, and the other end of the connecting pipe passes through and is fixedly installed on the inner side of the neutralization reaction box. The connecting pipe and the shell are connected by a hose, and the multiple nozzles are fixedly installed on the shell.

[0012] Furthermore, each spraying mechanism also includes a cylindrical rod, a fixed plate, an electric telescopic rod and a gear ring. The cylindrical rod is fixedly installed on the shell and passes through the top of the neutralization reaction box. 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 box. The output end of the electric telescopic rod is fixedly connected to the fixed plate. The gear ring is fixedly installed on the bottom of the shell. The gear ring is meshed with the gear, and the gear ring is rotatably connected to the L-shaped rod.

[0013] The beneficial effects of the present invention are as follows: the combined purification device for calcium-based desulfurization wastewater can drive the scraper plate to rotate, contact the inner wall of the neutralization reaction box or the flocculation reaction box and rotate through the arranged rotating mechanism, wall hanging mechanism and spraying mechanism, so as to scrape off the scale layer on the inner wall of the neutralization reaction box and the flocculation reaction box, thereby improving the use effect and service life of the purification device; at the same time, through the cleaning mechanism arranged in the scraper mechanism, the side of the scraper plate for scraping off the scale layer can be cleaned during the rotation of the scraper plate, thereby self-cleaning the scraper plate, thereby avoiding affecting the scraping and cleaning effect of the scraper plate after long-term use; in addition, through the arranged stirring mechanism, multiple groups of stirring blades can rotate themselves while rotating around the rotating column, thereby improving the stirring effect of the stirring blades, further improving the mixing effect and mixing efficiency of the wastewater and the reagent, thereby further improving the use effect and working efficiency of the purification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments of the present invention are briefly introduced below.

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a cross-sectional structural schematic diagram of the neutralization reaction box of the present invention; Figure 3 It is a schematic diagram of the front view structure of the rotating mechanism of the present invention; Figure 4 It is a schematic diagram of the front view structure of the wall scraping mechanism of the present invention; Figure 5 It is a schematic diagram of the structure of the scraper plate of the present invention in an inclined state; Figure 6 It is a schematic diagram of the disassembled structure of the wall scraping mechanism of the present invention; Figure 7 It is a schematic diagram of the main structure of the cleaning mechanism of the present invention; Figure 8 It is a schematic diagram of the split structure of the stirring mechanism of the present invention; Fig. 9 For the present invention Figure 3 The enlarged structural diagram of part B in the middle; Fig.10 This is a schematic diagram of the main structure of the stirring blade of the present invention; Fig.11 For the present invention Figure 2 A schematic diagram of the enlarged structure of part A.

[0016] In the figure: 1, neutralization reaction box; 2, flocculation reaction box; 3, filter box; 4, scraper mechanism; 41, scraper plate; 42, bottom rod; 43, top rod; 44, hinged rod; 45, moving block; 46, L-shaped rod; 47, inclined groove; 48, T-shaped rod; 49, cleaning mechanism; 491, cleaning rod; 492, moving rod; 493, slide; 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, medicine box; 72, connecting pipe; 73, hose; 74, shell; 75, cylindrical rod; 76, fixed plate; 77, electric telescopic rod; 78, gear ring; 79, nozzle. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0018] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product.

[0019] Reference Figures 1 to 3The combined purification device for calcium-based desulfurization wastewater shown in the figure comprises a neutralization reaction box 1, a flocculation reaction box 2, a filter box 3, four scraping mechanisms 4, four stirring mechanisms 5, two rotating mechanisms 6 and two spraying mechanisms 7. The flocculation reaction box 2 is connected to the neutralization reaction box 1 through a conveying pipe. The neutralization reaction box 1 is used for neutralization reaction and sedimentation treatment of the desulfurization wastewater. By adding an alkaline agent into the neutralization reaction box 1 to adjust the pH value of the wastewater, the heavy metal ions in the wastewater will combine with the hydroxide ions to form insoluble hydroxides for precipitation purification, and the supernatant in the neutralization reaction box 1 is conveyed to the flocculation reaction box 2 through the flocculation reaction box 2 and the neutralization reaction box 1 conveying pipe. A water inlet pipe is arranged on the top of the neutralization reaction box 1, and the wastewater is conveyed to the neutralization reaction box 1 through the water inlet pipe. The flocculation reaction box 2 is used for flocculation reaction and sedimentation treatment of desulfurization wastewater. By adding flocculants into the flocculation reaction box 2, the flocculants will cause the remaining fine suspended matter and colloidal particles in the wastewater to condense into larger flocs for sedimentation purification. The bottom ends of the flocculation reaction box 2 and the neutralization reaction box 1 are both provided with discharge pipes, and the flocs and sludge precipitated in the flocculation reaction box 2 and the neutralization reaction box 1 are discharged through the discharge pipes. The filter box 3 is connected to the flocculation reaction box 2 through a conveying pipe. The filter box 3 is used for filtering the desulfurization wastewater. The supernatant in the flocculation reaction box 2 is conveyed to the filter box 3 through the conveying pipe between the filter box 3 and the flocculation reaction box 2. The bottom end of the filter box 3 is provided with a water outlet pipe for discharging the filtered wastewater in the filter box 3.

[0020] Reference Figures 1 to 3 , two spraying mechanisms 7 are respectively fixedly installed on the neutralization reaction box 1 and the flocculation reaction box 2, and the spraying mechanism 7 is used to spray the reaction agent into the neutralization reaction box 1 or the flocculation reaction box 2. The two spraying mechanisms 7 can respectively spray the agent evenly into the neutralization reaction box 1 and the flocculation reaction box 2. Two rotating mechanisms 6 are respectively fixedly installed on the inner side of the neutralization reaction box 1 and the flocculation reaction box 2, and the rotating mechanism 6 is used to drive the scraping mechanism 4 and the stirring mechanism 5 to rotate. The four scraping mechanisms 4 are respectively used to clean the inner walls of the neutralization reaction box 1 and the flocculation reaction box 2. The four scraping mechanisms 4 are respectively staggered in pairs in the neutralization reaction box 1 and the flocculation reaction box 2, thereby improving the service life and use effect of the neutralization reaction box 1 and the flocculation reaction box 2. The four stirring mechanisms 5 are respectively used to stir the desulfurization wastewater and the reagent inside the neutralization reaction box 1 and the flocculation reaction box 2. The four stirring mechanisms 5 are respectively distributed in pairs in the neutralization reaction box 1 and the flocculation reaction box 2. Through the stirring mechanisms 5, the desulfurization wastewater and the reagent inside the neutralization reaction box 1 and the flocculation reaction box 2 can be mixed more evenly, avoiding excessive stirring and insufficient stirring.

[0021] Reference Figures 3 to 6, each scraper mechanism 4 includes a scraper plate 41, a moving block 45, an L-shaped rod 46 and a cleaning mechanism 49. The scraper plate 41 is connected to the rotating mechanism 6 through a bottom rod 42 and a top rod 43, and the upper and lower ends of the scraper plate 41 are rotatably connected to the bottom rod 42 and the top rod 43 respectively. The surface of the scraper plate 41 in contact with the inner wall of the neutralization reaction box 1 or the flocculation reaction box 2 is an oblique blade type, which makes the scraper plate 41 more labor-saving when scraping off the scale layer. 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 bottom rod 42 and the top rod 43 are driven to rotate by the rotating mechanism 6, and then the scraper plate 41 can be driven to rotate around the axis of the rotating mechanism 6. The scraper plate 41 is connected to the moving block 45 through a hinged rod 44, and the two ends of the hinged rod 44 are respectively hinged to the scraper plate 41 and the moving block 45. Through the moving effect of the moving block 45, it can bring The movable hinge rod 44 moves, thereby driving the scraper plate 41 to rotate, so that the scraper plate 41 contacts or releases the contact effect with the inner wall of the neutralization reaction box 1 or the flocculation reaction box 2. An inclined groove 47 is provided on the L-shaped rod 46. 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 inclined groove 47. The L-shaped rod 46 can be rotatably installed on the spraying mechanism 7, and the spraying mechanism 7 is used to drive the L-shaped rod 46 to move vertically. Through the moving effect of the L-shaped rod 46, the T-shaped rod 48 can slide along the inner wall of the inclined groove 47, and then drive the moving block 45 to slide along the guide column 62. The cleaning mechanism 49 can be slidably installed on the scraper plate 41. The cleaning mechanism 49 is used to clean the scraper plate 41 to prevent the scraper plate 41 from being attached to the oblique blade surface after long-term use, thereby affecting the scraping and cleaning effect.

[0022] Reference Figure 4 and Figure 7 The cleaning mechanism 49 includes a cleaning rod 491 and two moving rods 492. A sliding groove 493 is provided on the scraper plate 41. The cleaning rod 491 is slidably connected to the sliding groove 493. One side of the cleaning rod 491 is an inclined surface, which can better remove the attachments on the scraper plate 41. The two moving rods 492 are hinged to the upper and lower ends of the cleaning rod 491 respectively, 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, the scraper plate 41 can drive the cleaning rod 491 to slide along the sliding groove 493 when it rotates, so that the cleaning rod 491 can remove and clean the attachments on the scraper plate 41.

[0023] Reference Figures 8 to 10Each stirring mechanism 5 includes a plurality of stirring blades 51, a connecting rod 52, a plurality of rotating shafts 53 and a gear 54. The plurality of rotating shafts 53 are respectively fixedly mounted on the plurality of stirring blades 51. The stirring blades 51 are provided with a plurality of through holes, which can reduce the resistance when the stirring blades 51 rotate, and at the same time improve the fluidity of the liquid and the stirring effect. The plurality of rotating shafts 53 can be rotatably mounted on the rotating mechanism 6. Through the rotation effect of the rotating shafts 53, the stirring blades 51 can rotate. The rotating mechanism 6 is used to drive the plurality of rotating shafts 53 to rotate around the axis of the rotating mechanism 6. The plurality of stirring blades 51 are fixedly connected with fixed columns 55, and the plurality of fixed columns 55 are rotatably installed on the connecting rod 52. When one stirring blade 51 rotates, it can drive the connecting rod 52 to move, thereby driving the other stirring blades 51 to rotate. The gear 54 is fixedly installed on a rotating shaft 53 near the top of the rotating mechanism 6. When the gear 54 is engaged with the gear ring 78, when the rotating shaft 53 is driven to rotate by the rotating mechanism 6, the gear 54 will drive the rotating shaft 53 to rotate, thereby causing the stirring blade 51 to rotate.

[0024] 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 can be rotatably installed on the neutralization reaction box 1. Through the rotation effect of the rotating column 61, the guide column 62, the collar 63, the bottom rod 42 and the rotating shaft 53 can be driven to rotate at the same time. The guide column 62 is fixedly installed on the rotating column 61. The guide column 62 is slidably connected with the moving block 45. The guide column 62 guides the moving block 45 to prevent the moving block 45 from deviating during movement. The collar 63 is fixedly installed on the rotating column 61. On the rotating column 61, the ring 63 is fixedly connected to the top rod 43, and the rotation effect of the ring 63 can drive the top rod 43 to rotate. The ring 63 is slidably connected to the L-shaped rod 46, and the ring 63 guides the L-shaped rod 46. The bottom end of the rotating column 61 is fixedly connected to the bottom rod 42, and the rotating column 61 is rotationally connected to the rotating shaft 53. The motor 64 is fixedly installed at the bottom of the neutralization reaction box 1, and 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.

[0025] Reference Figure 2 and Fig.11Each spraying mechanism 7 includes a reagent box 71, a connecting pipe 72, a shell 74 and a plurality of nozzles 79. The reagent box 71 is fixedly mounted on the neutralization reaction box 1. The reagent box 71 arranged on the neutralization reaction box 1 stores an alkaline reagent, and the reagent box 71 arranged on the flocculation reaction box 2 stores a flocculant. One end of the connecting pipe 72 is fixedly mounted on the reagent box 71, and the other end of the connecting pipe 72 passes through and is fixedly mounted on the inner side of the neutralization reaction box 1. The reagent in the reagent box 71 is transported to the hose 73 through the connecting pipe 72. The connecting pipe 72 and the shell 74 are connected through the hose 73. The reagent is transported to the shell 74 through the hose 73. The shell 74 is annular. The plurality of nozzles 79 are fixedly mounted on the shell 74. The plurality of nozzles 79 are distributed in a circular array on the shell 74. The reagent in the shell 74 is evenly sprayed into the desulfurization wastewater through the plurality of nozzles 79.

[0026] Reference Fig.11 Each spray mechanism 7 further includes a cylindrical rod 75, a fixed plate 76, an electric telescopic rod 77 and a gear ring 78. The cylindrical rod 75 is fixedly mounted on the housing 74, and the cylindrical rod 75 passes through the top of the neutralization reaction box 1. The housing 74 is driven to move vertically by the moving effect of the cylindrical rod 75. The fixed plate 76 is fixedly mounted on the top of the cylindrical rod 75. The cylindrical rod 75 is driven to move vertically by the moving effect of the fixed plate 76. The electric telescopic rod 77 is fixedly mounted on the top of the neutralization reaction box 1. The output end is fixedly connected to the fixed plate 76. By starting the electric telescopic rod 77, the fixed plate 76 can be driven to move vertically. The gear ring 78 is fixedly installed at the bottom of the shell 74. The movement effect of the shell 74 drives the gear ring 78 to move vertically. The gear ring 78 is meshed with the gear 54. The movement effect of the gear ring 78 makes the gear ring 78 mesh or disengage with the gear 54. The gear ring 78 is rotatably connected to the L-shaped rod 46. The vertical movement effect of the gear ring 78 drives the L-shaped rod 46 to move vertically.

[0027] The combined purification device for calcium-based desulfurization wastewater can drive the scraper plate to rotate, contact the inner wall of the neutralization reaction box or the flocculation reaction box and rotate through the provided rotating mechanism, wall hanging mechanism and spraying mechanism, so as to scrape off the scale layer on the inner wall of the neutralization reaction box and the flocculation reaction box, thereby improving the use effect and service life of the purification device. At the same time, through the cleaning mechanism provided in the scraper mechanism, the side of the scraper plate for scraping off the scale layer can be cleaned during the rotation of the scraper plate, thereby self-cleaning the scraper plate, thereby avoiding the scraping and cleaning effect of the scraper plate being affected after long-term use. In addition, through the provided stirring mechanism, multiple groups of stirring blades can rotate themselves while rotating around the rotating column, thereby improving the stirring effect of the stirring blades, further improving the mixing effect and mixing efficiency of the wastewater and the reagent, thereby further improving the use effect and working efficiency of the purification device.

[0028] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A combined purification device for calcium desulfurization wastewater, characterized in that: The invention comprises a neutralization reaction box (1), a flocculation reaction box (2), a filter box (3), four scraping mechanisms (4), four stirring mechanisms (5), two rotating mechanisms (6) and two spraying mechanisms (7), wherein the flocculation reaction box (2) is connected to the neutralization reaction box (1) via a conveying pipe, the neutralization reaction box (1) is used for performing a neutralization reaction and sedimentation treatment on desulfurization wastewater, the flocculation reaction box (2) is used for performing a flocculation reaction and sedimentation treatment on desulfurization wastewater, the filter box (3) is connected to the flocculation reaction box (2) via a conveying pipe, the filter box (3) is used for filtering desulfurization wastewater, and the two spraying mechanisms (7) are fixed respectively. Installed on the neutralization reaction box (1) and the flocculation reaction box (2), the spraying mechanism (7) is used to spray the reaction reagent into the neutralization reaction box (1) or the flocculation reaction box (2), the two rotating mechanisms (6) are respectively fixedly installed on the inner side of the neutralization reaction box (1) and the flocculation reaction box (2), the rotating mechanism (6) is used to drive the scraping mechanism (4) and the stirring mechanism (5) to rotate, the four scraping mechanisms (4) are respectively used to clean the inner wall of the neutralization reaction box (1) and the flocculation reaction box (2), and the four stirring mechanisms (5) are respectively used to stir the desulfurization wastewater and reagent inside the neutralization reaction box (1) and the flocculation reaction box (2).

2. A combined purification device for calcium desulfurization wastewater according to claim 1, characterized in that: Each of the scraping mechanisms (4) comprises 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 respectively rotatably connected to the bottom rod (42) and the top rod (43); 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 of the L-shaped rod (46) are respectively hinged to the scraper plate (41) and the moving block (45); an inclined groove (47) is provided on the L-shaped rod (46); the L-shaped rod (46) and the moving block (45) are connected via a T-shaped rod (48); and the T-shaped rod (48) is slidably connected to the inner side of the inclined 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); and the cleaning mechanism (49) is used to clean the scraper plate (41).

3. A combined purification device for calcium desulfurization wastewater according to claim 2, characterized in that: The cleaning mechanism (49) comprises a cleaning rod (491) and two moving rods (492). A sliding groove (493) is provided on the scraper plate (41). 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 of the moving rods (492) is hinged to the bottom rod (42), and the other of the moving rods (492) is hinged to the top rod (43).

4. A combined purification device for calcium desulfurization wastewater according to claim 1, characterized in that: Each stirring mechanism (5) comprises a plurality of stirring blades (51), a connecting rod (52), a plurality of rotating shafts (53) and a gear (54); the plurality of rotating shafts (53) are respectively fixedly mounted on the plurality of stirring blades (51); the plurality of rotating shafts (53) are rotatably mounted on the rotating mechanism (6); the rotating mechanism (6) is used to drive the plurality of rotating shafts (53) to rotate around the axis of the rotating mechanism (6); the plurality of stirring blades (51) are fixedly connected to a fixing column (55); the plurality of fixing columns (55) are rotatably mounted on the connecting rod (52); and the gear (54) is fixedly mounted on a rotating shaft (53) close to the top of the rotating mechanism (6).

5. A combined purification device for calcium desulfurization wastewater according to claim 4, characterized in that: Each of the rotating mechanisms (6) comprises 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 box (1); the guide column (62) is fixedly mounted on the rotating column (61); the guide column (62) is slidably connected to the moving block (45); the collar (63) is fixedly mounted on the rotating column (61); the collar (63) 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 box (1); and the output shaft of the motor (64) is fixedly connected to the rotating column (61).

6. A combined purification device for calcium desulfurization wastewater according to claim 1, characterized in that: Each of the spraying mechanisms (7) comprises a medicine box (71), a connecting pipe (72), a shell (74) and a plurality of nozzles (79); the medicine box (71) is fixedly mounted on the neutralization reaction box (1); one end of the connecting pipe (72) is fixedly mounted on the medicine box (71); the other end of the connecting pipe (72) passes through and is fixedly mounted on the inner side of the neutralization reaction box (1); the connecting pipe (72) and the shell (74) are connected via a hose (73); and the plurality of nozzles (79) are fixedly mounted on the shell (74).

7. A combined purification device for calcium desulfurization wastewater according to claim 6, characterized in that: Each of the spraying mechanisms (7) further comprises a cylindrical rod (75), a fixed plate (76), an electric telescopic rod (77) and a gear ring (78); the cylindrical rod (75) is fixedly mounted on the housing (74), and the cylindrical rod (75) passes through the top of the neutralization reaction box (1); the fixed plate (76) is fixedly mounted on the top of the cylindrical rod (75); the electric telescopic rod (77) is fixedly mounted on the top of the neutralization reaction box (1); the output end of the electric telescopic rod (77) is fixedly connected to the fixed plate (76); the gear ring (78) is fixedly mounted on the bottom of the housing (74); the gear ring (78) is meshed with the gear (54); and the gear ring (78) is rotatably connected to the L-shaped rod (46).

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