Multifunctional chimney for circularly oxidizing desulfurization slurry
By cyclic oxidation of the wet desulfurization slurry using the lower space of the chimney outside the desulfurization device, the problems of high power consumption, high investment costs and large land area in the existing desulfurization system are solved, and the cost and land occupation are achieved.
Patent Information
- Application Number
- CN202421840156.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-08-01
AI Technical Summary
In existing desulfurization systems, the oxidation of the desulfurization slurry is usually carried out in a separately installed circulating oxidation tank in the desulfurization tower or outside, resulting in high power consumption of the system, increased investment costs and large footprint.
A multi-functional chimney was designed. By dividing the chimney into two parts, the upper and lower parts, the lower space of the chimney was used to circulate the oxidation of the wet desulfurization slurry, reducing the investment cost and floor area of the desulfurization system.
By circulating oxidation using the lower space of the chimney outside the desulfurization device, the investment cost and floor area of the desulfurization system are reduced, while improving the efficiency and safety of the system.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to a chimney, in particular to a multifunctional chimney for cyclically oxidizing desulfurized slurry. Background Art
[0002] With the gradual tightening of national environmental protection policies and the gradual improvement of environmental protection laws, the control of enterprise pollutant emission indicators has become increasingly strict. The existing electrolytic aluminum flue gas purification system using high-sulfur coke aluminum anodes needs to add desulfurization equipment in the future. Most of the current desulfurization slurry is oxidized in the desulfurization tower. Since the liquid level in the tower needs to be maintained at a certain height, the spray layer of the desulfurization tower is high, the head of the circulating pump is large, and the system power consumption is high; or a separate circulating oxidation tank is set outside the desulfurization tower, which increases the investment cost and also increases the floor space. Summary of the invention
[0003] The utility model proposes a multifunctional chimney for cyclically oxidizing desulfurized slurry in order to solve the above problems.
[0004] The purpose of the utility model is to separate the desulfurization slurry from the desulfurization system through cyclic oxidation, so as to reduce the investment cost of the desulfurization system.
[0005] To achieve the above-mentioned purpose, the utility model is a multifunctional chimney for circulating oxidation of wet desulfurization slurry, including a chimney, a partition is provided in the chimney which divides the chimney into two parts, an upper part and a lower part of the chimney, the upper part of the chimney is used for smoke exhaust, and the lower part of the chimney is used for circulating oxidation of wet desulfurization slurry, a flue gas inlet and a flushing pipe are provided at the lower part of the upper side wall of the chimney, a slurry inlet, a slurry outlet, an oxidation air conveying pipe, a slurry discharge port and a desulfurization gypsum discharge port are provided on the lower side wall of the chimney, an agitator is inserted into the cavity from the middle of the lower side wall of the chimney, the top of the guide pipe passes through the partition, and the bottom of the guide pipe extends to the lower part of the circulating oxidation part.
[0006] The height from the bottom of the smoke inlet on the upper part of the chimney to the partition is greater than the height from the flushing pipe to the partition, and the partition is arranged in the middle and lower part of the chimney; the number of the smoke inlets is 1-3.
[0007] The outlet on the upper part of the chimney is provided with an ice-breaking device and a fast-response thermocouple.
[0008] The ice breaking device and the fast-response thermocouple are interlockedly controlled.
[0009] The number of the stirrers is 3-6, and the lower part of the flow guide pipe is arranged in a shape surrounded by the 3-6 stirrers.
[0010] The agitator is arranged above the oxidation air conveying pipe, the oxidation air conveying pipe is arranged above the slurry discharge port, the slurry discharge port is arranged at the bottom of the lower part of the chimney, the slurry outlet and the oxidation air conveying pipe are at the same horizontal height, the slurry inlet is arranged above the slurry outlet, the desulfurization gypsum discharge port and the slurry discharge port are at the same horizontal height, and an exhaust pipe is arranged at the upper part of the lower part of the chimney.
[0011] The oxidation air delivery pipe and the exhaust pipe extend into the lower cavity of the chimney; the number of slurry inlets is 1-6.
[0012] The method for using a multifunctional chimney comprises the following steps: the flue gas after desulfurization enters the upper part of the chimney from the flue gas inlet, and is discharged into the atmosphere from the ice-breaking device at the top of the chimney; the sediment on the partition is flushed and cleaned by a flushing pipe, and the flushing water enters the lower part of the chimney from the guide pipe to mix with the desulfurization slurry; the desulfurization slurry enters the lower cavity of the chimney from the slurry inlet, stays at the lower part of the chimney, and oxidizing air is sent into the desulfurization slurry through the oxidizing air delivery pipe to oxidize the desulfurization slurry, and the calcium sulfite in the desulfurization slurry is oxidized into calcium sulfate, and the unused oxidizing air is discharged into the desulfurization system from the exhaust pipe on the liquid surface of the desulfurization slurry, and the agitator works at the same time to prevent the precipitation of limestone in the desulfurization slurry, and the desulfurization gypsum is discharged from the desulfurization gypsum discharge port to the gypsum dehydration system, and the desulfurization slurry is sent into the desulfurization device from the slurry outlet.
[0013] It also includes the discharge of desulfurization slurry from the slurry discharge port during accident maintenance.
[0014] Advantages and effects of the utility model: The utility model sets the circulating oxidation zone of limestone-gypsum wet desulfurization outside the desulfurization device, and uses the lower space of the chimney as the circulating oxidation zone, which reduces the investment cost and floor space of the desulfurization system. The utility model is not only suitable for electrolytic aluminum flue gas purification and desulfurization projects, but also suitable for industries and fields such as carbon roasting, carbon calcination, coal-fired power plants, and graphitized electrodes. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of the utility model.
[0016] In the figure: 1. Flue gas inlet; 2. Slurry inlet; 3. Partition; 4. Flushing pipe; 5. Guide pipe; 6. Slurry outlet; 7. Lower part of chimney; 8. Upper part of chimney; 9. Agitator; 10. Oxidation air delivery pipe; 11. Slurry discharge port; 12. Ice breaking device; 13. Fast response thermocouple; 14. Exhaust pipe; 15. Desulfurized gypsum discharge port. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the specific implementation of the utility model to clearly and completely describe the technical solutions in the specific implementation of the utility model. Obviously, the specific implementation described is only a part of the specific implementation of the utility model, not all of the specific implementation. Based on the specific implementation of the utility model, all other specific implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0018] like Figure 1 As shown, the utility model is a multifunctional chimney for cyclic oxidation of wet desulfurization slurry, comprising a chimney, a partition 3 is provided in the chimney to divide the chimney into two parts, an upper chimney 8 and a lower chimney 7, the upper chimney 8 is used for smoke exhaust, and the lower chimney 7 is used for cyclic oxidation of wet desulfurization slurry, a flue gas inlet 1 and a flushing pipe 4 are provided at the lower part of the side wall of the upper chimney 8, a slurry inlet 2, a slurry outlet 6, an oxidation air delivery pipe 10, a slurry discharge port 11 and a desulfurized gypsum discharge port 15 are provided on the side wall of the lower chimney 7, an agitator 9 is inserted into the cavity from the middle of the side wall of the lower chimney 7, the top of the guide pipe 5 passes through the partition 3, and the bottom of the guide pipe 5 extends to the lower part of the cyclic oxidation part. The chimney can be made of brick-concrete, carbon steel, 2205 stainless steel, glass fiber reinforced plastic or 316L, and the present embodiment is brick-concrete. When the interior of the chimney needs to be anticorrosive, anticorrosive in the form of glass flakes or silicon carbide is used.
[0019] The height from the bottom of the flue gas inlet 1 on the upper part 8 of the chimney to the partition 3 is greater than the height from the flushing pipe 4 to the partition 3, and the partition 3 is arranged in the middle and lower part of the chimney; the number of flue gas inlets 1 is 1-3, and the present application is 1. The outlet of the upper part 8 of the chimney is provided with an ice-breaking device 12 and a fast-response thermocouple 13 to prevent ice from forming at the chimney outlet in cold areas. The ice-breaking device 12 and the fast-response thermocouple 13 are interlockedly controlled. The ice-breaking device 12 can be heated by electricity or steam. Once the fast-response thermocouple detects that the temperature is lower than / higher than the set value, it automatically starts / stops the electric heater. The ice-breaking device 12 in the utility model is a prior art.
[0020] There are 3-6 agitators 9, which are evenly arranged along the outer periphery of the chimney lower part 7. The utility model has 4 agitators, and the lower part of the guide pipe 5 is arranged in the shape surrounded by the working ends of the 4 agitators 9. The agitator 9 is arranged above the oxidation air conveying pipe 10, and the oxidation air conveying pipe 10 is arranged above the slurry discharge port 11. The slurry discharge port 11 is arranged at the bottom of the chimney lower part 7. The slurry outlet 6 is at the same level as the oxidation air conveying pipe 10, the slurry inlet 2 is arranged above the slurry outlet 6, the desulfurized gypsum discharge port 15 is at the same level as the slurry discharge port 11, and an exhaust pipe 14 is arranged at the upper part of the chimney lower part 7.
[0021] The oxidation air delivery pipe 10 and the exhaust pipe 14 extend into the cavity 7 of the lower part of the chimney; the number of the slurry inlet 2 is 1-6, and the number of the utility model is 1.
[0022] The method for using the multifunctional chimney comprises the following steps: the flue gas after desulfurization enters the upper part 8 of the chimney from the flue gas inlet 1, and is discharged into the atmosphere from the ice-breaking device 12 at the top of the chimney; the sediment on the partition 3 is flushed and cleaned by the flushing pipe 4, and the flushing water enters the lower part 7 of the chimney from the guide pipe 5 to mix with the desulfurization slurry; the desulfurization slurry enters the cavity of the lower part 7 of the chimney from the slurry inlet 2, stays in the lower part 7 of the chimney, and oxidizing air is sent into the desulfurization slurry through the oxidizing air delivery pipe 10 to oxidize the desulfurization slurry, and the calcium sulfite in the desulfurization slurry is oxidized into calcium sulfate, and the unused oxidizing air is discharged into the desulfurization system from the exhaust pipe 14 on the liquid surface of the desulfurization slurry, and the agitator works at the same time to prevent the precipitation of limestone in the desulfurization slurry, and the desulfurization gypsum is discharged from the desulfurization gypsum discharge port 15 to the gypsum dehydration system, and the desulfurization slurry is sent into the desulfurization device from the slurry outlet 6.
[0023] During accident maintenance, the desulfurized slurry is discharged from the slurry discharge port 11.
[0024] The lower part of the multifunctional chimney for circulating oxidation of wet desulfurization slurry is used as a desulfurization slurry circulating oxidation zone.
[0025] The utility model makes full use of the space below the chimney, oxidizes the desulfurization slurry below the chimney, has a compact layout, and reduces investment costs. A fast-response thermocouple is arranged at the top of the chimney, and the fast-response thermocouple is interlocked with the heater of the ice-breaking device at the top of the chimney. Once the fast-response thermocouple detects that the temperature is lower than / higher than the set value, it automatically starts / stops the electric heater to ensure system safety and stability. The circulating oxidation zone of the limestone-gypsum wet desulfurization is arranged outside the desulfurization device to reduce the height of the desulfurization device, and the space below the chimney is used as the circulating oxidation zone, which reduces the investment cost and floor space of the desulfurization system.
Claims
1. A multifunctional chimney for circulating oxidation of desulfurized slurry, comprising a chimney, characterized in that A partition (3) is provided in the chimney to divide the chimney into two parts, an upper chimney part (8) and a lower chimney part (7). The upper chimney part (8) is used for smoke exhaust, and the lower chimney part (7) is used for circulating oxidation of wet desulfurization slurry. A flue gas inlet (1) and a flushing pipe (4) are provided at the lower part of the side wall of the upper chimney part (8). A slurry inlet (2), a slurry outlet (6), an oxidation air conveying pipe (10), a slurry discharge port (11) and a desulfurized gypsum discharge port (15) are provided on the side wall of the lower chimney part (7). An agitator (9) is inserted into the cavity from the middle of the side wall of the lower chimney part (7). The top of the draft tube (5) passes through the partition (3), and the bottom of the draft tube (5) extends to the lower part of the circulating oxidation part.
2. The multifunctional chimney for circulating oxidation of desulfurized slurry according to claim 1 is characterized in that The height from the bottom of the flue gas inlet (1) on the upper part (8) of the chimney to the partition (3) is greater than the height from the flushing pipe (4) to the partition (3), and the partition (3) is arranged in the middle and lower part of the chimney; the number of the flue gas inlets (1) is 1-3.
3. The multifunctional chimney for circulating oxidation of desulfurized slurry according to claim 1 or 2, characterized in that The outlet of the chimney upper part (8) is provided with an ice-breaking device (12) and a fast-response thermocouple (13).
4. The multifunctional chimney for circulating oxidation of desulfurized slurry according to claim 3 is characterized in that The ice breaking device (12) and the fast-response thermocouple (13) are interlockedly controlled.
5. The multifunctional chimney for circulating oxidation of desulfurized slurry according to claim 1 is characterized in that The number of the stirrers (9) is 3 to 6, and the lower part of the flow guide pipe (5) is arranged in a shape surrounded by the 3 to 6 stirrers (9).
6. The multifunctional chimney for circulating oxidation of desulfurized slurry according to claim 5, characterized in that The stirrer (9) is arranged above the oxidation air conveying pipe (10), the oxidation air conveying pipe (10) is arranged above the slurry discharge port (11), the slurry discharge port (11) is arranged at the bottom of the lower part (7) of the chimney, the slurry outlet (6) and the oxidation air conveying pipe (10) are at the same horizontal height, the slurry inlet (2) is arranged above the slurry outlet (6), the desulfurized gypsum discharge port (15) and the slurry discharge port (11) are at the same horizontal height, and an exhaust pipe (14) is arranged at the upper part of the lower part (7) of the chimney.
7. The multifunctional chimney for circulating oxidation of desulfurized slurry according to claim 6 is characterized in that The oxidation air delivery pipe (10) and the exhaust pipe (14) extend into the cavity of the lower part (7) of the chimney; the number of the slurry inlets (2) is 1-6.