Corrosion-resistant absorption tower pit

Abstract

The utility model discloses a corrosion-resistant absorption tower pit, which belongs to the technical field of wet desulphurization and comprises a pit main body, a top cover is arranged at the top of the pit main body, and a conveying unit for conveying desulfurization slurry and a stirring component for stirring the desulfurization slurry are arranged on the top cover. One side of the main pit body is provided with an air blowing assembly for conveying gas generated in the stirring process of the desulfurization slurry. The concentration of acid gas in the pit is reduced through the blast assembly, so that the corrosion rate of equipment such as a motor and a pump body is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to a corrosion-resistant absorption tower pit and belongs to the technical field of wet desulfurization. Background Art

[0002] The absorption tower pit is a key component of the wet desulfurization system. Its main functions include collecting the desulfurization slurry discharged from the absorption tower, temporarily storing wastewater to be treated, and providing a transfer channel for slurry circulation.

[0003] In actual operation, the desulfurization slurry will release acidic gases mainly composed of sulfur dioxide during the stirring process. These gases are highly corrosive and cause serious damage to the equipment:

[0004] Shortened equipment life: Traditional pits lack effective gas treatment equipment, and acidic gases accumulate on the roof and surrounding equipment, accelerating the corrosion of components such as motor terminals and pump seals. The average replacement cycle is only 3-6 months, resulting in high maintenance costs.

[0005] Poor operational stability: Solid particles in the slurry tend to settle at the bottom of the pit. Traditional mixing structures cannot completely eliminate dead corners of sedimentation, leading to blockage of the conveying pipelines. Regular shutdowns for cleaning are required, affecting the continuous operation of the desulfurization system.

[0006] Maintenance operations are cumbersome: Existing pit covers are mostly designed with integral sealing. During maintenance, multiple connecting parts need to be removed, which takes a long time. In addition, acid gas leakage can easily pose a health threat to operators. Utility Model Content

[0007] In order to solve the above technical problems, the utility model provides a corrosion-resistant absorption tower pit, which achieves the goals of improving the corrosion resistance of the equipment, optimizing the operating efficiency and reducing the maintenance cost by designing a directional exhaust system.

[0008] The technical solution adopted by the utility model to solve its technical problems is:

[0009] A corrosion-resistant absorption tower pit includes a pit body, a top cover is provided on the top of the pit body, a conveying unit for conveying desulfurization slurry and a stirring assembly for stirring the desulfurization slurry are provided on the top cover, and a blast assembly for conveying gas generated by the desulfurization slurry during the stirring process is provided on one side of the pit body.

[0010] Preferably, the blowing assembly includes a centrifugal fan, which is fixed to the ground through a bracket, an air inlet of the centrifugal fan is connected to the pit body through a pipe component, and an air outlet of the centrifugal fan is connected to an exhaust pipe.

[0011] Preferably, the pipeline component includes a pipeline and a connecting pipe, the pipeline is a square pipeline, one end of the pipeline is connected to the pit body, the other end of the pipeline is connected to the connecting pipe, and the air outlet end of the connecting pipe is connected to the air inlet of the centrifugal fan.

[0012] Preferably, the delivery unit includes a pump body, which is connected to the top cover through a bearing seat, the liquid inlet end of the pump body is connected to a delivery branch pipe, and the end of the delivery branch pipe is connected to a delivery pipeline connected to the absorption tower.

[0013] Preferably, the stirring assembly includes a motor, which is connected to the top cover through a supporting frame. The output shaft of the motor extends into the pit body and is connected to a drive shaft. Several mounting sleeves are provided on the drive shaft, and several stirring blades are provided on the outer peripheral side of the mounting sleeve.

[0014] Preferably, four stirring arms are provided on the upper and lower sides of the driving shaft, an extension arm is slidably connected to the stirring arm, a locking bolt is provided at the end of the extension arm, a sliding groove corresponding to the locking bolt is opened on the stirring arm, and two scrapers are connected to the ends of the four extension arms.

[0015] Preferably, an inspection cover is provided on the top cover, and an inspection door is rotatably connected to the inspection cover via a hinge.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The air blast assembly reduces the acid gas concentration in the pit from the traditional 500ppm to ≤50ppm, reduces the corrosion rate of motors, pumps and other equipment by 60%, and extends the service life from 1 year to more than 3 years;

[0018] The synergistic effect of the stirring blade and the scraper reduces the slurry deposition from the traditional 30kg / m² per day to ≤2kg / m² per day, reduces the blockage rate of the conveying pipeline by 95%, and reduces the downtime for cleaning by 40 hours per year;

[0019] The access door design reduces single maintenance time from 2 hours to 30 minutes, reducing annual maintenance hours by 160 hours.

[0020] The frequency of equipment replacement has been reduced, the annual spare parts cost has been reduced from 50,000 yuan to 10,000 yuan, and the overall operating cost has been reduced by 80%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a cross-sectional view of the overall structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the utility model without a top cover;

[0025] Figure 4 This is a schematic structural diagram of the blast assembly of the present utility model;

[0026] Figure 5 This is a schematic structural diagram of the stirring assembly of the present utility model;

[0027] Figure 6 This is a schematic structural diagram of the drive shaft of the present invention.

[0028] In the figure: 1. Pit body; 2. Top cover; 3. Pipe; 4. Connecting pipe; 5. Centrifugal fan; 6. Exhaust pipe; 7. Delivery pipe; 8. Support seat; 9. Pump body; 10. Delivery branch pipe; 11. Support frame; 12. Motor; 13. Drive shaft; 14. Mounting sleeve; 15. Agitator blade; 16. Agitator arm; 17. Extension arm; 18. Locking bolt; 19. Slide; 20. Scraper; 21. Inspection cover; 22. Inspection door. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figures 1-6 , the utility model provides a technical solution:

[0031] like Figure 1As shown, a corrosion-resistant absorption tower pit includes a pit body 1. The pit body 1 includes an outer layer with a square cross-section and a circular inner liner. The inner liner is located in the middle of the outer layer. The outer layer and the inner liner are both cast with reinforced concrete. The inner wall is lined with 20mm thick glass flake mortar, which is temperature-resistant ≤120°C and acid-resistant with a pH range of 1-13. The gap between the outer layer and the inner liner is convenient for staff to maintain the inner liner. A top cover 2 is provided on the top of the pit body 1. The top cover 2 is made of 316L stainless steel and has a thickness of 12mm. A conveying unit for conveying desulfurization slurry and a stirring assembly for stirring the desulfurization slurry are provided on the top cover 2. A blast assembly is provided on one side of the pit body 1 for directionally discharging acidic gases in the inner liner.

[0032] like Figure 3 As shown, the delivery unit includes a pump body 9, which is an IHF fluoroplastic centrifugal pump with a flow rate of 30-60m³ / h. The pump body 9 is connected to the top cover 2 through a bearing seat 8. The liquid outlet of the pump body 9 is connected to the inner tank through a discharge pipe. The liquid inlet end of the pump body 9 is connected to a delivery branch pipe 10. The delivery branch pipe 10 is a rubber-lined seamless steel pipe with a diameter of 80mm. The end of the delivery branch pipe 10 is connected to a delivery pipe 7 connected to the absorption tower.

[0033] like Figure 1 As shown, an inspection cover 21 is provided on the top cover 2. The height of the inspection cover 21 is 300 mm and the material is the same as the top cover 2. One side of the inspection cover 21 is connected to the inspection door 22 by a hinge and is equipped with a nitrile rubber sealing strip. A handle and a lock are provided on the inspection door 22 to ensure the sealing when closed. An observation window is opened on the side of the inspection cover 21, which is made of acid-resistant glass to facilitate real-time observation of the situation in the pit.

[0034] like Figure 4 As shown, the blowing assembly includes a centrifugal fan 5, the air volume of the centrifugal fan 5 is 1200-1800m³ / h, the air pressure is 250-350Pa, the centrifugal fan 5 is fixed to the ground by a steel bracket, the air inlet of the centrifugal fan 5 is connected to the pit body 1 through a pipe component, and the air outlet of the centrifugal fan 5 is connected to the exhaust pipe 6, and the end of the exhaust pipe 6 can be connected to the desulfurization system exhaust gas treatment device.

[0035] Furthermore, the pipeline component includes a pipeline 3 and a connecting pipe 4. The pipeline 3 is a square pipeline with a cross-sectional size of 200mm×200mm. The pipeline 3 is welded to the top side of the pit body 1, and the end of the pipeline 3 is connected to the inner liner of the pit body 1. The opening position of the inner liner of the pit body 1 is 600mm higher than the maximum slurry level to ensure that the gas is collected without slurry entrainment. The other end is sealed with the connecting pipe 4 through a flange, and the small end of the connecting pipe 4 is connected to the air inlet flange of the centrifugal fan 5 to achieve a smooth transition of the gas from the square pipeline to the circular pipeline and reduce wind resistance.

[0036] like Figure 5-Figure 6 As shown, the stirring assembly includes a motor 12, the power of the motor 12 is 4-7.5kW, the protection grade is IP65, and it is equipped with an anti-corrosion junction box. The motor 12 is connected to the top cover 2 through the carrier frame 11. The output shaft of the motor 12 extends into the pit body 1 and is connected to the drive shaft 13. The drive shaft 13 is made of 316L stainless steel with a diameter of 70mm. There are 3 sets of mounting sleeves 14 on the shaft body, with an interval of 500mm. Three stirring blades 15 are evenly distributed on the outer periphery of each set of mounting sleeves 14. The stirring blades 15 are 8mm thick and have an inclination angle of 45° to enhance the radial stirring force.

[0037] Furthermore, four stirring arms 16 with a length of 600 mm are symmetrically welded on the upper and lower sides of the driving shaft 13. An extension arm 17 is slidably connected to the stirring arm 16. A locking bolt 18 is provided at the end of the extension arm 17. The extension arm 17 is fixed in position by the locking bolt 18. A slide groove 19 corresponding to the locking bolt 18 is provided on the stirring arm 16. Two scrapers 20 are connected to the ends of the four extension arms 17. The gap between the scraper 20 and the inner liner of the pit body 1 can be adjusted through the extension arm 17. The adjustment range is 5-20 mm, so as to achieve complete removal of the slurry deposited on the pit wall.

[0038] like Figure 2 As shown, a circulation pipe is provided at the bottom of the inner liner of the pit body 1, and a solenoid valve is installed on the circulation pipe. The solenoid valve is located between the outer layer and the inner liner. The liquid outlet side of the circulation pipe extends out of the pit body 1. The homogenized slurry in the pit body 1 is transported back to the absorption tower through the delivery pump and the circulation pipe to continue to participate in the desulfurization reaction. When the gypsum content in the slurry reaches saturation, part of the slurry will be transported to the gypsum dehydration system.

[0039] The working process of this embodiment is as follows: the motor 12 is started, and the driving shaft 13 drives the stirring blade 15 to rotate at a speed of 50-80 r / min to uniformly mix the desulfurization slurry; at the same time, the scraper 20 rotates with the driving shaft 13 to remove the deposited slurry on the inner wall of the pit body 1;

[0040] The centrifugal fan 5 is started synchronously. The acidic gas generated by the mixing in the pit is sucked into the centrifugal fan 5 through the square pipe 3 and the connecting pipe 4, and then sent to the exhaust gas treatment system through the exhaust pipe 6, so that the pit maintains a slightly negative pressure (-50 to -100 Pa) to prevent gas from overflowing;

[0041] When the slurry needs to be circulated, the pump body 9 is started, the slurry in the absorption tower is extracted through the delivery branch pipe 10, and pumped into the pit body 1 through the delivery pipe 7;

[0042] Open the inspection door 22 and inspect or maintain the stirring assembly and the delivery branch pipe 10 through the inspection port without removing the top cover 2. The operation time is ≤30 minutes.

[0043] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant absorption tower pit, comprising a pit body, a top cover provided on the top of the pit body, a conveying unit for conveying desulfurization slurry and a stirring assembly for stirring the desulfurization slurry, characterized in that: A blast assembly for conveying gas generated during the stirring process of the desulfurization slurry is provided on one side of the pit body.

2. The corrosion-resistant absorption tower pit according to claim 1, characterized in that: The air blowing assembly includes a centrifugal fan, which is fixed to the ground through a bracket. The air inlet of the centrifugal fan is connected to the pit body through a pipe component, and the air outlet of the centrifugal fan is connected to an exhaust pipe.

3. The corrosion-resistant absorption tower pit according to claim 2, characterized in that: The pipeline component includes a pipeline and a connecting pipe. The pipeline is a square pipeline. One end of the pipeline is connected to the pit body, and the other end of the pipeline is connected to the connecting pipe. The air outlet end of the connecting pipe is connected to the air inlet of the centrifugal fan.

4. The corrosion-resistant absorption tower pit according to claim 1, characterized in that: The delivery unit includes a pump body, which is connected to the top cover through a bearing seat. The liquid inlet end of the pump body is connected to a delivery branch pipe, and the end of the delivery branch pipe is connected to a delivery pipeline connected to the absorption tower.

5. The corrosion-resistant absorption tower pit according to claim 1, characterized in that: The stirring assembly includes a motor, which is connected to the top cover through a supporting frame. The output shaft of the motor extends into the pit body and is connected to a drive shaft. Several mounting sleeves are provided on the drive shaft, and several stirring blades are provided on the outer peripheral side of the mounting sleeve.

6. The corrosion-resistant absorption tower pit according to claim 5, characterized in that: Four stirring arms are provided on the upper and lower sides of the driving shaft, and an extension arm is slidably connected to the stirring arm. A locking bolt is provided at the end of the extension arm. A sliding groove corresponding to the locking bolt is opened on the stirring arm, and two scrapers are connected to the ends of the four extension arms.

7. The corrosion-resistant absorption tower pit according to claim 1, characterized in that: The top cover is provided with an inspection cover, and the inspection cover is rotatably connected to an inspection door via a hinge.

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