Tail gas desulfurization device for chemical industrial boiler

Abstract

The utility model relates to the technical field of industrial waste gas treatment, and discloses a tail gas desulfurization device for a chemical industrial boiler, which comprises a bottom plate, a desulfurization tower is mounted in the middle of the top of the bottom plate, an inclined cover plate is mounted at the top of the desulfurization tower, and a glass steel plate is fixedly connected to the bottom of the inclined cover plate and positioned on one side of an inner cavity of the desulfurization tower. The inclined cover plate with the inclined glass steel plate is arranged in the desulfurization tower, so that fine steam which is not captured by the baffle plate demister is secondarily blocked, wrapped unseparated desulfurization slurry, residual acidic substances and harmful gases are intercepted to prevent discharged particulate matters from exceeding the standard, and the steam is guided to be condensed into water drops to flow along the inclined surface by virtue of the inclined structure, so that the desulfurization effect is improved. Compared with the prior art, the problems of blade scaling, system resistance increase and secondary water carrying caused by direct impact of water drops at the top are solved, the demisting efficiency is effectively maintained, and stable operation of the desulfurization system and standard emission of tail gas are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial waste gas treatment, in particular to a tail gas desulfurization device for chemical industry boilers. Background Art

[0002] Chemical industry boilers are the core thermal energy equipment in chemical production. When burning sulfur-containing fuels such as coal and heavy oil, they will produce a large amount of tail gas containing sulfides such as sulfur dioxide. If directly discharged, it will cause serious air pollution and violate environmental protection regulations. Therefore, the tail gas needs to be introduced into the tail gas desulfurization device through a dedicated pipeline to form a closed treatment loop. The tail gas is first cooled and pre-treated to adapt to the reaction conditions, and then sent to the desulfurization tower by the induced draft fan. The circulating spray system in the tower atomizes absorbents such as limestone slurry, which fully contacts and reacts with the tail gas to generate solid and liquid by-products. After the droplets are removed by the demister, they are discharged in compliance with the standards. The by-products are treated simultaneously. The device will adjust the absorbent supply and spray intensity in conjunction with changes in boiler load to ensure stable desulfurization when the tail gas volume and sulfur content fluctuate, which not only guarantees the normal energy supply of the boiler, but also achieves environmental protection standards for the tail gas, forming a "waste production-waste treatment" synergistic system to avoid sulfide pollution.

[0003] In the desulfurization treatment of tail gas from chemical industrial boilers, the desulfurization tower is the core equipment, and its internal demister plays a key role. By separating the droplets carried by the tail gas after the desulfurization reaction, the slurry and impurities contained in the droplets can prevent corrosion or blockage of subsequent pipelines and equipment. This is a key link in ensuring the stable operation of the desulfurization system and the compliance of tail gas emissions. However, existing desulfurization towers have obvious technical limitations in actual operation: water vapor in the tower drifts with the rising airflow and easily condenses at the top of the tower to form water droplets. These water droplets will continuously drip from top to bottom onto the demister blades. On the one hand, the flue gas dust and slurry impurities carried by the water droplets will directly adhere to the blade surface. After combining with the original liquid film on the blades, they will accelerate the formation of hard scale, leading to gradual blockage of the airflow channel and increased system resistance. On the other hand, the continuous impact of a large number of water droplets will disrupt the stable flow state of the liquid film on the blade surface, causing the liquid film to be broken up into fine droplets that re-mix into the airflow, causing "secondary water entrainment" and significantly reducing the gas-liquid separation efficiency of the demister. Utility Model Content

[0004] In response to the deficiencies in the prior art, the utility model provides a tail gas desulfurization device for chemical industry boilers, which has the advantages of reducing the impact of condensed water droplets on the top of the tower body on the demister blades, inhibiting the formation of hard scale, avoiding secondary water carryover, improving the gas-liquid separation efficiency, reducing system resistance, and ensuring the long-term stable operation of the desulfurization system. It solves the problem in the background technology that condensed water droplets on the top of the tower body continue to drip onto the demister blades, causing accelerated hard scale formation on the blade surface, blockage of the air flow channel, increased system resistance, and destruction of the liquid film causing secondary water carryover, and significantly reduced gas-liquid separation efficiency of the demister.

[0005] In order to achieve the above-mentioned purpose of reducing the impact of condensed water droplets on the top of the tower body on the demister blades, inhibiting the formation of hard scale, avoiding secondary water, improving the gas-liquid separation efficiency, reducing system resistance, and ensuring the long-term stable operation of the desulfurization system, the utility model provides the following technical solutions: A tail gas desulfurization device for a chemical industry boiler, comprising a base plate, a desulfurization tower is installed at the top middle part of the base plate, an inclined cover plate is installed on the top of the desulfurization tower, the bottom of the inclined cover plate is located on one side of the inner cavity of the desulfurization tower and is fixedly connected to a fiberglass plate, a baffle demister is installed on the upper part of the inner cavity of the desulfurization tower, a guide groove is provided on the edge of one side of the top of the baffle demister, and a guide groove is penetrated and started on the edge of one side of the baffle demister, and the guide groove cooperates with the guide groove, a guide pipe is penetrated and fixedly connected on one side of the outer wall of the desulfurization tower, and the bottom side of the guide pipe penetrates the base plate, and the upper side of the guide pipe is fixedly connected to the guide groove.

[0006] As a further solution of the present invention: an air intake pipe is passed through and fixedly connected to the lower part of the outer wall of the desulfurization tower away from the guide pipe, and a support rod is fixedly connected to the top of the air intake pipe, and a conical cover is fixedly connected to the side of the support rod away from the air intake pipe.

[0007] As a further solution of the present invention: an exhaust port is passed through and provided on one side of the upper portion of the outer wall of the desulfurization tower, and the exhaust port is matched with the glass fiber reinforced plastic plate.

[0008] As a further solution of the present invention: a storage box is fixedly connected to the side of the top of the base plate away from the desulfurization tower, a water pump is installed on the side of the top of the base plate away from the storage box, and the output end of the water pump passes through the storage box and is fixedly connected.

[0009] As a further solution of the present invention: a connecting pipe is installed on one side of the top of the water pump, and three water spray pipes are fixedly connected to the outer wall of one side of the connecting pipe. The water spray pipes pass through the desulfurization tower and are arranged in the inner cavity of the desulfurization tower.

[0010] As a further solution of the present invention: a discharge pipe is passed through and fixedly connected to the side of the outer wall of the desulfurization tower away from the storage box, and a discharge valve is installed on the outer wall of the discharge pipe.

[0011] As a further solution of the present invention: a circulation pipe is passed through and fixedly connected to the side of the outer wall of the storage box away from the water pump, and the side of the circulation pipe away from the storage box passes through and fixedly connected to the discharge pipe, and a filter is installed in the middle of the circulation pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] In the utility model, an inclined cover plate with an inclined fiberglass plate is arranged in the desulfurization tower to form a secondary barrier for the fine steam that is not captured by the baffle demister, thereby intercepting the unseparated desulfurization slurry, residual acidic substances and harmful gases to avoid exceeding the emission standard of particulate matter, and using the inclined structure to guide the steam to condense into water droplets and flow along the inclined surface to avoid the demister blades. Compared with the existing technology that causes blade scaling, increased system resistance and secondary water entrainment caused by direct impact of water droplets on the top, the demisting efficiency is effectively maintained, and the stable operation of the desulfurization system and the standard emission of exhaust gas are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0015] Figure 2 This is a side sectional view of the desulfurization tower of the utility model;

[0016] Figure 3 For the utility model Figure 2 Enlarged view of point A in the middle;

[0017] Figure 4 This is a schematic diagram of the circulation pipe of the present utility model.

[0018] In the figure: 1. Base plate; 2. Desulfurization tower; 3. Inclined cover plate; 4. Fiberglass plate; 5. Baffle demister; 6. Guide trough; 7. Guide trough; 8. Guide pipe; 9. Inlet pipe; 10. Support rod; 11. Conical cover; 12. Exhaust port; 13. Storage box; 14. Water pump; 15. Connecting pipe; 16. Water spray pipe; 17. Circulation pipe; 18. Filter; 19. Discharge pipe; 20. Discharge valve. DETAILED DESCRIPTION

[0019] 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.

[0020] See also Figures 1 to 4In the embodiment of the present invention, a tail gas desulfurization device for a chemical industry boiler includes a bottom plate 1, a desulfurization tower 2 is installed in the middle of the top of the bottom plate 1, an inclined cover plate 3 is installed on the top of the desulfurization tower 2, the bottom of the inclined cover plate 3 is located on one side of the inner cavity of the desulfurization tower 2 and is fixedly connected with a glass fiber reinforced plastic plate 4, and a baffle demister 5 is installed on the upper part of the inner cavity of the desulfurization tower 2. During the spraying process, the high-temperature exhaust gas contacts the low-temperature absorbent to generate a large amount of steam containing droplets. These steam moves upward with the air flow and enters the baffle demister 5. The plate demister 5 intercepts the droplets in the steam through the inertial collision and gravity sedimentation of the blades. The droplets with larger diameters hit the blades due to inertia or settle under the action of gravity and are effectively captured and separated. A guide groove 6 is provided on the edge of one side of the top of the baffle demister 5. A guide groove 7 is penetrated and started on the edge of one side of the baffle demister 5, and the guide groove 7 cooperates with the guide groove 6. A guide pipe 8 is penetrated and fixedly connected to one side of the outer wall of the desulfurization tower 2, and the bottom side of the guide pipe 8 penetrates the bottom plate 1. The guide pipe The upper side of 8 is fixedly connected to the guide groove 7, the lower part of the outer wall of the desulfurization tower 2 away from the guide pipe 8 is penetrated and fixedly connected with an air inlet pipe 9, the top of the air inlet pipe 9 is fixedly connected with a support rod 10, and the side of the support rod 10 away from the air inlet pipe 9 is fixedly connected with a conical cover 11. The upper side of the outer wall of the desulfurization tower 2 is penetrated and provided with an exhaust port 12, and the exhaust port 12 is matched with the glass fiber reinforced plastic plate 4. The part of the fine steam that is not completely captured will continue to drift upward and contact the glass fiber reinforced plastic plate 4 at the bottom of the inclined cover plate 3. The glass fiber reinforced plastic plate 4 uses its inclined surface to form a secondary barrier for steam: on the one hand, it intercepts the unseparated desulfurization slurry, residual acidic substances and harmful gases entrained in the steam, preventing their direct discharge and causing pollution such as excessive particulate matter. On the other hand, the inclined structure guides the steam to condense. The steam attached to the surface of the glass fiber reinforced plastic plate 4 gradually condenses into water droplets, which flow downward along the inclined surface instead of dripping vertically, thus avoiding the baffle demister 5 and preventing the secondary water problem caused by the water droplets impacting the blades. The water droplets eventually drip into the guide groove 6.

[0021] A storage tank 13 is fixedly connected to the side of the top of the base plate 1 away from the desulfurization tower 2. A water pump 14 is installed on the side of the top of the base plate 1 away from the storage tank 13, and the output end of the water pump 14 passes through the storage tank 13 and is fixedly connected. A connecting pipe 15 is installed on the top side of the water pump 14. Three water spray pipes 16 are fixedly connected to the outer wall of one side of the connecting pipe 15. The water spray pipes 16 pass through the desulfurization tower 2 and are set in the inner cavity of the desulfurization tower 2. When the water pump 14 is turned on, the desulfurization absorbent in the storage tank 13 is extracted and transported to the water spray pipes 16 through the connecting pipes 15. Finally, it is sprayed on the exhaust gas in the base plate 1 in an atomized state, and desulfurization is achieved through the chemical reaction between the absorbent and the pollutants in the exhaust gas.

[0022] A discharge pipe 19 is passed through and fixedly connected to the side of the outer wall of the desulfurization tower 2 away from the storage box 13, and a discharge valve 20 is installed on the outer wall of the discharge pipe 19. A circulation pipe 17 is passed through and fixedly connected to the side of the outer wall of the storage box 13 away from the water pump 14, and the side of the circulation pipe 17 away from the storage box 13 passes through the discharge pipe 19 and is fixedly connected. A filter 18 is installed in the middle of the circulation pipe 17. When there is a lot of circulating slurry after the desulfurization reaction stored in the lower part of the inner cavity of the bottom plate 1, it can be guided to the storage box 13 through the discharge pipe 19 and the circulation pipe 17. When passing through the circulation pipe 17, it is first filtered through the filter 18 to remove impurities, and then enters the storage box 13 for recycling. If circulation is not required, the discharge valve 20 can be opened to allow the circulating slurry after the desulfurization reaction in the bottom plate 1 to be directly discharged through the discharge pipe 19. The filter 18 is a prior art and will not be described here.

[0023] The working principle of the utility model is as follows: during operation, the exhaust gas after high-temperature combustion is first transported to the bottom plate 1 through the air intake pipe 9. When the exhaust gas is discharged from the air intake pipe 9, it will contact and collide with the conical cover 11. At this time, the exhaust gas is evenly diffused to the surroundings under the blocking effect of the conical cover 11, expanding the contact area with the subsequent desulfurization absorbent, creating conditions for efficient desulfurization;

[0024] When the exhaust gas diffuses into the bottom plate 1, the water pump 14 is turned on to extract the desulfurization absorbent in the storage tank 13, and transported to the water spray pipe 16 through the connecting pipe 15. Finally, it is sprayed on the exhaust gas in the bottom plate 1 in an atomized state. Desulfurization is achieved through the chemical reaction between the absorbent and the pollutants in the exhaust gas.

[0025] During the spraying process, the high-temperature exhaust gas contacts the low-temperature absorbent to generate a large amount of steam containing droplets. These steam moves upward with the airflow and enters the baffle demister 5. The baffle demister 5 intercepts the droplets in the steam through the inertial collision of the blades and the gravity sedimentation. The droplets with larger diameters collide with the blades due to inertia or settle under the action of gravity, and are effectively captured and separated.

[0026] The part of fine steam that is not completely captured will continue to drift upward and contact the glass fiber reinforced plastic plate 4 at the bottom of the inclined cover plate 3. The glass fiber reinforced plastic plate 4 uses the inclined surface to form a secondary barrier for the steam: on the one hand, it intercepts the unseparated desulfurization slurry, residual acidic substances and harmful gases entrained in the steam, preventing their direct discharge and causing pollution such as excessive particulate matter. On the other hand, the inclined structure guides the steam to condense. The steam attached to the surface of the glass fiber reinforced plastic plate 4 gradually condenses into water droplets, which flow downward along the inclined surface instead of dripping vertically, thus avoiding the baffle demister 5 and preventing the "secondary water entrainment" problem caused by the water droplets impacting the blades. The water droplets eventually drip into the guide groove 6.

[0027] Subsequently, the water droplets flow into the guide groove 7 through the guide groove 6, and then flow to the lower part of the inner cavity of the bottom plate 1 through the guide pipe 8, where they mix with the circulating slurry after the desulfurization reaction, thereby realizing the recovery and reuse of the absorbent and forming a complete liquid circuit cycle.

[0028] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tail gas desulfurization device for a chemical industry boiler, comprising a bottom plate (1), characterized in that: A desulfurization tower (2) is installed in the middle of the top of the base plate (1), and an inclined cover plate (3) is installed on the top of the desulfurization tower (2). The bottom of the inclined cover plate (3) is located on one side of the inner cavity of the desulfurization tower (2) and is fixedly connected to a glass fiber reinforced plastic plate (4). A baffle demister (5) is installed on the upper part of the inner cavity of the desulfurization tower (2). A guide groove (6) is opened on the edge of one side of the top of the baffle demister (5). A guide groove (7) is penetrated and started on the edge of one side of the baffle demister (5), and the guide groove (7) cooperates with the guide groove (6). A guide pipe (8) is penetrated and fixedly connected on one side of the outer wall of the desulfurization tower (2), and the bottom side of the guide pipe (8) penetrates the base plate (1). The upper side of the guide pipe (8) is fixedly connected to the guide groove (7).

2. The tail gas desulfurization device for a chemical industry boiler according to claim 1, characterized in that: An air inlet pipe (9) is passed through and fixedly connected to the lower portion of the outer wall of the desulfurization tower (2) away from the guide pipe (8), a support rod (10) is fixedly connected to the top of each air inlet pipe (9), and a conical cover (11) is fixedly connected to the side of the support rod (10) away from the air inlet pipe (9).

3. The tail gas desulfurization device for a chemical industry boiler according to claim 1, characterized in that: An exhaust port (12) is provided through one side of the upper portion of the outer wall of the desulfurization tower (2), and the exhaust port (12) is matched with the glass fiber reinforced plastic plate (4).

4. The tail gas desulfurization device for a chemical industry boiler according to claim 1, characterized in that: A storage box (13) is fixedly connected to the side of the top of the base plate (1) away from the desulfurization tower (2), and a water pump (14) is installed on the side of the top of the base plate (1) away from the storage box (13), and the output end of the water pump (14) passes through the storage box (13) and is fixedly connected.

5. The tail gas desulfurization device for chemical industry boilers according to claim 4 is characterized in that: A connecting pipe (15) is installed on one side of the top of the water pump (14), and three water spray pipes (16) are fixedly connected to the outer wall of one side of the connecting pipe (15). The water spray pipes (16) pass through the desulfurization tower (2) and are arranged in the inner cavity of the desulfurization tower (2).

6. The tail gas desulfurization device for a chemical industry boiler according to claim 1, characterized in that: A discharge pipe (19) is passed through and fixedly connected to a side of the outer wall of the desulfurization tower (2) away from the storage box (13), and a discharge valve (20) is installed on the outer wall of the discharge pipe (19).

7. The tail gas desulfurization device for chemical industry boilers according to claim 4, characterized in that: A circulation pipe (17) is passed through and fixedly connected to the side of the outer wall of the storage box (13) away from the water pump (14), and the side of the circulation pipe (17) away from the storage box (13) is passed through and fixedly connected to the discharge pipe (19). A filter (18) is installed in the middle of the circulation pipe (17).

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