Dry-wet desulfurization and denitrification integrated equipment

Abstract

The utility model relates to dry-wet desulfurization and denitrification integrated equipment which comprises a purification tower, a smoke inlet and a smoke outlet are connected to the purification tower, a first partition plate, a second partition plate and a driving shaft are arranged in the purification tower, and the first partition plate divides the internal space of the purification tower into a wet purification area and a clean area which are independent from each other up and down; the second partition plate is located in the cleaning area and divides the cleaning area into an adsorption area and a regeneration area which are independent left and right; the smoke inlet is communicated with the wet purification area, and a wet desulfurization and denitrification system is arranged in the wet purification area. According to the dry-wet desulfurization and denitrification integrated equipment disclosed by the utility model, the wet desulfurization and denitrification system and the dry adsorption and regeneration system based on the active coke are integrated, so that the structure is simplified, and the occupied area and the investment of the equipment are reduced due to the integrated design of the wet desulfurization and denitrification system and the dry adsorption and regeneration system.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to an integrated wet and dry desulfurization and denitrification device. Background Technique

[0002] In the prior art, flue gas purification is an important environmental protection link in industrial production. Flue gas generated in industrial processes such as coal-fired power plants, metallurgy, and chemical industries contains a large number of pollutants, such as sulfur dioxide (SO2), nitrogen oxides (NOx), particulate matter, heavy metals, and volatile organic compounds (VOCs), etc. The discharge of these pollutants into the atmosphere will cause serious environmental pollution, endanger human health, and lead to environmental problems such as acid rain and haze. Therefore, it is crucial to develop efficient, economical, and reliable flue gas purification technologies.

[0003] The activated coke flue gas purification technology has attracted much attention because it can achieve low-temperature denitrification while desulfurizing, and has a certain removal effect on pollutants such as dust, heavy metals, and dioxins. More importantly, this technology converts sulfur resources into high-quality sulfuric acid to realize resource recycling and utilization, which conforms to the concept of circular economy and is considered a very promising comprehensive treatment technology for multiple pollutants.

[0004] At present, the activated coke flue gas purification technology mainly consists of two processes: adsorption and regeneration. The commonly used process method is to arrange the adsorption tower and the regeneration tower separately. This design results in a large number of equipment, complex pipelines, and a large floor area, thus increasing the investment cost and the difficulty of operation and maintenance. Content of the Utility Model

[0005] In order to solve the above problems, the utility model provides an integrated wet and dry desulfurization and denitrification device with a simplified structure, reduced equipment floor area and investment.

[0006] To achieve the above object, the wet and dry desulfurization and denitrification integrated equipment designed by the utility model includes a purification tower. An inlet flue and an outlet flue are connected to the purification tower. A first partition board, a second partition board and a driving shaft are arranged in the purification tower. The first partition board divides the internal space of the purification tower into an upper and lower independent wet purification area and a clean purification area. The second partition board is located in the clean purification area and divides the clean purification area into a left and right independent adsorption area and a regeneration area. The inlet flue is communicated with the wet purification area, and a wet desulfurization and denitrification system is arranged in the wet purification area. The driving shaft extends into the clean purification area from the top of the purification tower and is rotatably installed on the first partition board. A plurality of turntables are coaxially and fixedly installed on the driving shaft. Openings adapted to the turntables are formed on the second partition board. Half of each turntable is located in the adsorption area and the other half is located in the regeneration area. Activated coke is loaded on the turntable, and gaps for the flue gas in the adsorption area to flow are formed between the loaded activated coke. Wherein, a through hole communicating the wet purification area and the adsorption area is formed on the first partition board, and the outlet flue is communicated with the adsorption area for discharging the flue gas flowing through each turntable.

[0007] To make the regeneration process more efficient and thorough, the regeneration area includes a heating device, a first induced draft fan, an air inlet and an air extraction port. The air inlet and the air extraction port are both communicated with the regeneration area. The heating device is connected with the air inlet through the first induced draft fan, and the air extraction port is used for connecting an external waste gas treatment system.

[0008] To make the hot air flow distribution in the regeneration area more uniform, the air inlet is arranged at the top of the regeneration area.

[0009] To avoid gas cross-flow between the regeneration area and the adsorption area, a sealing lip is arranged between the turntable and the edge of the opening on the second partition board.

[0010] To improve the wet desulfurization efficiency, the wet desulfurization and denitrification system includes a demister, a liquid distribution pipe and a liquid collection tank arranged from top to bottom. Atomizing nozzles for spraying downward are arranged on the liquid distribution pipe.

[0011] To facilitate the discharge of the waste liquid in the liquid collection tank, the liquid collection tank adopts a conical bottom design with a cone angle > 45°.

[0012] To improve the utilization rate and adsorption efficiency of the activated coke, the turntable includes an annular outer frame and a spoke support. The activated coke is loaded in the annular outer frame. A plurality of annular outer frames are provided, and the diameters of the plurality of annular outer frames increase progressively to form a concentric structure. Each annular outer frame is fixedly connected through a spoke support, and gaps are formed between adjacent annular outer frames.

[0013] A further solution is that the annular outer frames on any two adjacent turntables are arranged in a staggered manner up and down.

[0014] A further solution is that the radial cross-section of the annular outer frame is flat, and each of the annular outer frames is arranged obliquely in the vertical direction.

[0015] In order to reduce the humidity of the flue gas emissions, each of the annular outer frames is also filled with a dehumidification block supported by a hygroscopic material.

[0016] The integrated wet and dry flue gas desulfurization and denitrification equipment designed by the present utility model integrates a wet flue gas desulfurization and denitrification system and a dry adsorption and regeneration system based on activated coke. Its integrated design simplifies the structure, reduces the equipment floor area and investment, and improves the operation stability and equipment life. It is an efficient, economical, environmentally friendly and easy-to-maintain flue gas purification solution with broad application prospects. Brief Description of the Drawings

[0017] Figure 1 is a schematic plan view of the integrated wet and dry flue gas desulfurization and denitrification equipment provided by an embodiment of the present application;

[0018] Figure 2 is Figure 1 the sectional view taken along line A-A in

[0019] Figure 3 is Figure 2 the sectional view taken along line B-B in

[0020] Figure 4 is another schematic view of an embodiment of the annular outer frame provided by an embodiment of the present application.

[0021] Wherein: purification tower 10, flue gas inlet 11, flue gas outlet 12, first partition 13, second partition 14, drive shaft 15, wet purification area 20, clean purification area 30, adsorption area 31, regeneration area 32, heating device 321, first induced draft fan 322, air inlet 323, air extraction port 324, wet flue gas desulfurization and denitrification system 40, demister 41, liquid distribution pipe 42, liquid collection tank 43, turntable 50, annular outer frame 51, spoke support 52, dehumidification block 53, activated coke 60. Detailed Description of the Embodiment

[0022] The following is a description of the preferred embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not intended to limit the present utility model.

[0023] As Figures 1 to 4 shown, the integrated wet and dry flue gas desulfurization and denitrification equipment described in this embodiment is used to purify the flue gas discharged from a coal-fired power plant. The equipment includes a purification tower 10, the top of which is connected with a flue gas inlet 11 for introducing the flue gas to be purified. The side wall of the purification tower 10 is connected with a flue gas outlet 12 for discharging the purified clean flue gas. Among them, a first partition 13, a second partition 14 and a drive shaft 15 are provided in the purification tower 10.

[0024] The interior of the purification tower 10 is divided into two independent upper and lower areas by the first partition 13: an upper clean purification area 30 and a lower wet purification area 20. A wet desulfurization and denitrification system 40 is provided in the wet purification area 20, and the wet desulfurization and denitrification system 40 is used for spraying absorption liquid, such as limestone slurry.

[0025] The clean area 30 is further divided into two independent areas on the left and right by the second partition 14: the adsorption area 31 on the left and the regeneration area 32 on the right. The drive shaft 15 extends from the top of the purification tower 10 into the clean area 30 and is rotatably mounted on the first partition 13. A plurality of turntables 50 are coaxially fixedly mounted on the drive shaft 15, and half of each turntable 50 is located in the adsorption area 31 and the other half is located in the regeneration area 32. The second partition 14 is provided with an opening adapted to each turntable 50, allowing the turntable 50 to rotate between the adsorption area 31 and the regeneration area 32. In this embodiment, a variable frequency motor (not shown) connected to the drive shaft 15 is provided at the top of the purification tower 10 to drive each turntable 50 to rotate synchronously through the drive shaft 15.

[0026] Among them, each turntable 50 is filled with activated coke 60, and gaps are left between the activated coke 60 for flue gas to flow. At the same time, a through hole is opened on the first partition 13, so that the flue gas treated by the wet desulfurization and denitrification system 40 can enter the adsorption area 31 and contact with the activated coke 60 on the turntable 50, further adsorbing pollutants in the flue gas, so that the purified flue gas is finally discharged through the exhaust port 12.

[0027] Take the purification of flue gas emitted by coal-fired power plants to remove pollutants such as SO2 and NOx as an example: in actual operation, flue gas containing pollutants such as SO2 and NOx enters the wet purification area 20 of the purification tower 10 through the smoke inlet 11. In this area, the wet desulfurization and denitrification system 40 can fully contact the flue gas by spraying limestone slurry to mainly remove SO2 in the flue gas. At the same time, the system can also absorb some water-soluble NO2, and the flue gas after wet desulfurization treatment then enters the adsorption area 31.

[0028] In the adsorption area 31, multiple turntables 50 filled with activated coke 60 rotate at predetermined time intervals. Due to its unique porous structure and large specific surface area, the activated coke 60 can effectively adsorb NO in the flue gas that cannot be removed by wet method. These NO are oxidized to NO2 together with O2 in the micropores of the activated coke 60, and are adsorbed and retained inside the activated coke 60, thereby completing the removal of nitrides. In addition, the activated coke 60 can also effectively adsorb other pollutants such as heavy metals and VOCs in the flue gas, realizing the coordinated treatment of multiple pollutants.

[0029] To maintain the adsorption efficiency of the activated coke 60, the continuous rotation of the rotary table 50 brings the activated coke 60 with saturated adsorption into the regeneration zone 32. In the regeneration zone 32, the desulfurization activity of the activated coke adsorbent can be restored through thermal regeneration treatment. The regenerated activated coke 60 re-enters the adsorption zone 31 and continues to participate in the flue gas purification process. This means that the rotary table 50 does not need to frequently replace the activated coke 60 of the adsorbent. It only needs to rotate once after running for a period of time to bring the activated coke 60 adsorbed with pollutants into the regeneration zone 32 for regeneration, and bring back a part of the regenerated activated coke to the adsorption zone 31 for purification operation, so as to realize the recycling of the activated coke 60, which not only reduces the consumption of materials, but also maintains continuous and efficient flue gas purification, and also reduces the floor area and investment cost of the equipment through integrated design.

[0030] In some embodiments, as Figure 1 shown, the regeneration zone 32 includes a heating device 321, a first induced draft fan 322, an air inlet 323 and an air extraction port 324. The air inlet 323 and the air extraction port 324 are both communicated with the regeneration zone 32. The heating device 321 is connected to the air inlet 323 through the first induced draft fan 322. The air extraction port 324 is used to connect to an external waste gas treatment system. In this way, the first induced draft fan 322 is connected to the heating device 321, so that the heat provided by the heating device 321 is transported to the air inlet 323 through the first induced draft fan 322, raising the temperature of the activated coke 60, thereby desorbing the adsorbed pollutants. The desorbed activated coke 60 is regenerated and its adsorption capacity is restored, while the regenerated air is discharged through the air extraction port 324 and finally enters the external waste gas treatment system for further treatment, such as acid making or adsorption treatment, to avoid secondary pollution.

[0031] In some embodiments, as Figure 1 shown, in order to make the hot air flow distribution in the regeneration zone 32 more uniform, the air inlet 323 is arranged at the top of the regeneration zone 32. In this way, by arranging the air inlet 323 at the top of the regeneration zone 32, the hot air can be evenly distributed from top to bottom, reducing the air flow dead angle, enabling the hot air to penetrate the activated coke 60 more effectively and improving the heat exchange efficiency.

[0032] In some embodiments, a sealing lip (not shown in the figure) is provided between the rotary table 50 and the opening edge of the second partition 14. The sealing lip can effectively prevent the direct exchange of gas between the regeneration zone 32 and the adsorption zone 31, avoiding the gas mixing of the two zones and ensuring the independence and effectiveness of the flue gas purification process.

[0033] In some embodiments, as Figure 1As shown in the figure, in order to improve the efficiency of wet desulfurization, the wet desulfurization and denitrification system 40 includes a demister 41, a liquid distribution pipe 42 and a liquid collection tank 43 arranged from top to bottom. The liquid distribution pipe 42 is provided with atomizing nozzles for spraying downward. In specific implementation, the demister 41 at the top is mainly composed of corrugated plates and baffle plates, which is used to capture the fine droplets entrained in the flue gas, prevent the loss of slurry and avoid the corrosion of subsequent equipment by wet flue gas. The liquid distribution pipe 42 arranged in the middle adopts a circular arrangement, and a number of downward atomizing nozzles are installed on the pipe. These nozzles are arranged at a specific angle and spacing according to the spraying coverage requirements to achieve uniform atomization distribution of the slurry, increasing the gas-liquid contact area. The liquid collection tank 43 at the bottom has a sufficient volume to store the circulating slurry, and the liquid collection tank 43 can also be provided with a stirring device to ensure uniform slurry concentration and prevent gypsum deposition.

[0034] In this embodiment, as Figure 1 shown, in order to facilitate the discharge of the waste liquid in the liquid collection tank 43, the liquid collection tank 43 adopts a conical bottom design, and the cone angle > 45°. The cone angle design greater than 45° is more conducive to the sliding of impurities and precipitates towards the conical bottom and prevents them from adhering to the tank wall.

[0035] In some embodiments, as Figure 2 、 Figure 3 shown, in order to improve the utilization rate and adsorption efficiency of the activated coke 60, the turntable 50 includes an annular outer frame 51 and a spoke support 52. The activated coke 60 is filled in the annular outer frame 51. A plurality of annular outer frames 51 are provided, and the diameters of the plurality of annular outer frames 51 increase progressively to form a concentric structure. Each annular outer frame 51 is fixedly connected by a spoke support 52, and a gap is formed between adjacent annular outer frames 51.

[0036] In specific implementation, the annular outer frame 51 can be made of stainless steel material, and 4 - 6 annular outer frames 51 are arranged in sequence from inside to outside in terms of diameter. Each annular outer frame 51 is evenly connected and fixed by 8 - 12 spoke supports 52. The spoke supports 52 adopt an equal-strength design to ensure the structural stability of the turntable. During operation, a gap space of 150 - 200 mm is left between adjacent annular outer frames 51 for the flue gas to flow through. 100 - 150 mm thick activated coke 60 is filled in each annular outer frame 51, and the particle size of the activated coke is selected as 4 - 6 mm. This particle size can not only ensure a sufficient specific surface area but also not cause too much resistance.

[0037] In some embodiments, the annular outer frames 51 on any two adjacent turntables 50 are arranged vertically staggered. This staggered structure design enables the flue gas to form a serpentine flow channel when flowing through each layer of activated coke, effectively prolonging the contact time between the flue gas and the activated coke. At the same time, the staggered arrangement can also break the laminar flow state of the flue gas, enhance the turbulent effect, and promote the full mixing of the gas-solid two phases, thereby improving the mass transfer efficiency and removal effect of pollutants.

[0038] In some embodiments, as Figure 4 shown, the radial cross-section of the annular outer frame 51 is flat, and each annular outer frame 51 is arranged obliquely in the vertical direction. The flat cross-sectional structure can reduce the air flow resistance and lower the system energy consumption. The oblique arrangement increases the gas-solid contact area and can prevent the flue gas from quickly passing along a fixed path, thereby further improving the pollutant removal efficiency.

[0039] In some embodiments, as Figure 4 shown, a dehumidification block 53 supported by a hygroscopic material is further filled in each annular outer frame 51. In this embodiment, the dehumidification block 53 is made of a silica-based composite material with a large specific surface area and has excellent hygroscopic performance, which can reduce the moisture content of the flue gas entering the adsorption zone 31, thereby reducing the absolute moisture content of the flue gas discharged from the smoke exhaust port 12. This helps to reduce the formation of the plume, improve the diffusion ability of the flue gas, and reduce the impact on the surrounding environment. In addition, the dehumidification block 53 can be regenerated in the regeneration zone 32 as the turntable 50 rotates like the activated coke 60, reducing the operation and maintenance costs.

[0040] The integrated wet and dry flue gas desulfurization and denitrification equipment provided in this embodiment integrates a wet flue gas desulfurization and denitrification system and a dry adsorption and regeneration system based on activated coke. Its integrated design simplifies the structure, reduces the equipment floor area and investment, and improves the operation stability and equipment life. It is an efficient, economical, environmentally friendly and easy-to-maintain flue gas purification solution with broad application prospects.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0042] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An integrated wet and dry desulfurization and denitrification device, including a purification tower, wherein a smoke inlet and a smoke outlet are connected to the purification tower, and it is characterized in that, The purification tower is provided with a first partition board, a second partition board and a driving shaft. The first partition board divides the internal space of the purification tower into an upper and a lower independent wet purification area and clean purification area. The second partition board is located in the clean purification area and divides the clean purification area into a left and a right independent adsorption area and regeneration area. The smoke inlet is communicated with the wet purification area, and a wet flue gas desulfurization and denitrification system is arranged in the wet purification area. The driving shaft extends into the clean purification area from the top of the purification tower and is rotatably installed on the first partition board. A plurality of turntables are coaxially and fixedly installed on the driving shaft. Openings adapted to the turntables are formed on the second partition board. Half of each turntable is located in the adsorption area and the other half is located in the regeneration area. Activated coke is loaded on the turntable, and gaps for the flue gas in the adsorption area to flow through are formed between the loaded activated coke. Wherein, through holes communicating the wet purification area and the adsorption area are formed on the first partition board, and the smoke outlet is communicated with the adsorption area for discharging the flue gas flowing through each turntable.

2. The integrated wet and dry desulfurization and denitrification equipment according to claim 1, characterized in that, The regeneration area includes a heating device, a first induced draft fan, an air inlet and an air extraction port. The air inlet and the air extraction port are both communicated with the regeneration area. The heating device is connected with the air inlet through the first induced draft fan, and the air extraction port is used for connecting an external waste gas treatment system.

3. The integrated dry and wet desulfurization and denitrification equipment according to claim 2, characterized in that, The air inlet is arranged at the top of the regeneration area.

4. The integrated wet and dry desulfurization and denitrification equipment according to claim 1, wherein A sealing lip is arranged between the turntable and the edge of the opening on the second partition board.

5. The integrated wet and dry desulfurization and denitrification equipment according to claim 1, characterized in that The wet flue gas desulfurization and denitrification system includes a demister, a liquid distribution pipe and a liquid collecting tank arranged from top to bottom. Atomizing nozzles for spraying downward are arranged on the liquid distribution pipe.

6. The integrated wet and dry desulfurization and denitrification equipment according to claim 5, wherein The liquid collecting tank adopts a cone bottom design with a cone angle > 45°.

7. The integrated wet and dry desulfurization and denitrification equipment according to any one of claims 1-6, characterized in that, The turntable includes an annular outer frame and a spoke support. The activated coke is loaded in the annular outer frame. A plurality of annular outer frames are provided, and the diameters of the plurality of annular outer frames increase progressively to form a concentric structure. Each annular outer frame is fixedly connected through a spoke support, and gaps are formed between adjacent annular outer frames.

8. The integrated wet and dry desulfurization and denitrification equipment according to claim 7, wherein, The annular outer frames on any two adjacent turntables are arranged in a staggered manner up and down.

9. The integrated dry and wet desulfurization and denitrification equipment according to claim 7, characterized in that, The radial cross section of the annular outer frame is flat, and each annular outer frame is arranged obliquely in the vertical direction.

10. The integrated wet and dry desulfurization and denitrification equipment according to claim 8, characterized in that, Each annular outer frame is further filled with a dehumidification block supported by a hygroscopic material.

Images