Flue gas purification device for desulfurization and denitrification

Abstract

The utility model discloses a flue gas purification device for desulfurization and denitrification, which belongs to the technical field of flue gas purification devices and comprises a purification tower body, a gas inlet pipe is fixedly mounted on the outer wall of the purification tower body, and a gas outlet pipe is fixedly mounted at the top end of the purification tower body. A slurry pipe for injecting a catalyst is mounted at the bottom of the gas inlet pipe, a spraying structure for assisting purification is fixedly mounted in an inner cavity of the purification tower body, and sulfur and nitrogen oxides are directly removed by chemical reaction through the spraying structure by using compound means such as catalyst injection, slurry spraying and stirring and mixing. The mass transfer reaction is enhanced by means of the stirring structure, meanwhile, all the components are in close cooperation, the gas inlet pipe and the gas outlet pipe are responsible for flue gas circulation, the centrifugal pump and the like form a slurry circulation system, the filter screen and the like guarantee stable operation of equipment, the demister guarantees dry emission of flue gas, and a complete and efficient purification chain is formed.

Description

A flue gas purification device for desulfurization and denitrification Technical Field

[0001] This utility model relates to the technical field of flue gas purification devices, specifically a flue gas purification device for desulfurization and denitrification. Background Technology

[0002] Flue gas desulfurization and denitrification devices are widely used in industries such as power, steel, and chemicals. They play an important role in reducing the emission of sulfur dioxide and nitrogen oxides in flue gas and protecting the environment, and can effectively reduce the emission concentration of sulfur dioxide in flue gas.

[0003] Chinese patent discloses a flue gas purification device for desulfurization and denitrification (publication number CN208130759U). The patent includes a purification tower body, an air inlet pipe fixedly installed on one side of the purification tower body, one end of the air inlet pipe extending into the purification tower body, a fixing block welded to the inner wall of one side of the purification tower body, a first through hole opened on one side of the fixing block, and the end of the air inlet pipe located inside the purification tower body fixedly installed in the first through hole, a filter plate slidably installed in the first through hole, a trapezoidal groove with one side open on the top inner wall and the bottom inner wall of the first through hole, and a second through hole opened on the inner wall of the two trapezoidal grooves that are far apart from each other, and a push rod slidably installed in the second through hole;

[0004] Therefore, based on the above search and combined with existing data, filter plates mainly rely on physical interception to remove solid particles in flue gas, lacking chemical adsorption and catalytic conversion mechanisms for gaseous sulfur and nitrogen oxides. However, this patent only uses filter plates to purify flue gas, which cannot meet the basic functions of desulfurization and denitrification, making it difficult to remove pollutants in flue gas, resulting in extremely low desulfurization and denitrification efficiency and substandard purification effect of the device. Summary of the Invention

[0005] The purpose of this invention is to provide a flue gas purification device for desulfurization and denitrification, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A flue gas purification device for desulfurization and denitrification includes a purification tower body, an air inlet pipe fixedly installed on the outer wall of the purification tower body, an air outlet pipe fixedly installed at the top of the purification tower body, a slurry pipe for injecting catalyst installed at the bottom of the air inlet pipe, and a spray structure for auxiliary purification fixedly installed in the inner cavity of the purification tower body.

[0008] The spray structure includes spray pipes, three sets of which are fixedly installed in the inner cavity of the purification tower body. A centrifugal pump for conveying slurry is fixedly installed at the bottom of the outer wall of the purification tower body. One end of the spray pipe passes through the purification tower body and is fixedly connected to the output end of the centrifugal pump through a connecting pipe. A stirring structure for promoting the mixing of flue gas and catalyst is fixedly installed at the bottom of the inner cavity of the purification tower body.

[0009] As a further embodiment of this utility model, the stirring structure includes a positioning shaft, the bottom end of which is fixedly connected to the bottom surface of the inner cavity of the purification tower body. A fixing frame is fixedly sleeved on the outer wall of the positioning shaft, and three sets of rotating rods are rotatably connected to the outer wall of the fixing frame. Each set of rotating rods has multiple sets of mixing plates fixedly installed on its outer wall for assisting in the mixing of flue gas and catalyst.

[0010] As a further embodiment of this utility model, a connecting frame is fixedly sleeved on the outer wall of the rotating rod, and scrapers for preventing slurry sedimentation are fixedly installed at both the upper and lower ends of the connecting frame. By rotating synchronously with the rotating rod, slurry sedimentation can be effectively prevented during rotation.

[0011] As a further embodiment of this utility model, the end of the rotating rod away from the fixed frame is rotatably connected to a mounting bracket for supporting the rotating rod, and a filter screen for preventing the centrifugal pump from becoming clogged is fixedly installed on the side of the mounting bracket away from the purification tower body.

[0012] As a further embodiment of this utility model, the inner wall of the purification tower body is fixedly installed with three sets of fixing plates for fixing and supporting the spray pipes, and each set of fixing plates is fixedly sleeved on the outer wall of the spray pipe, and multiple nozzles are fixedly installed at the bottom end of each set of spray pipes.

[0013] As a further embodiment of this utility model, a partition is fixedly installed on the inner wall of the purification tower body, and a plurality of demisters for separation and demisting are fixedly installed in the inner cavity of the partition.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. When this utility model is used, it uses a spray structure and a combination of catalyst injection, slurry spraying and stirring to directly remove sulfur and nitrogen oxides through chemical reaction. The stirring structure enhances the mass transfer reaction. At the same time, all components work closely together. The inlet and outlet pipes are responsible for flue gas circulation. The centrifugal pump and other components form a slurry circulation system. The filter screen ensures stable operation of the equipment. The demister ensures that the flue gas is discharged dry, forming a complete and efficient purification chain, which fundamentally solves the problem of poor purification effect of a single filter plate.

[0016] 2. When this utility model is used, the scraper in the stirring structure prevents slurry sedimentation, the auxiliary block reduces friction, and the filter screen is self-cleaning. This reduces equipment maintenance costs and ensures long-term stable operation. The multi-structure collaborative purification mode enables it to adapt to complex and ever-changing flue gas conditions and is also easy to adjust flexibly, effectively improving the reliability and practicality of the device and laying a solid foundation for industrial flue gas to meet emission standards. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of a flue gas purification device for desulfurization and denitrification.

[0018] Figure 2 is a cross-sectional view of the overall structure of a flue gas purification device for desulfurization and denitrification.

[0019] Figure 3 is a structural diagram of the stirring structure in a flue gas purification device for desulfurization and denitrification.

[0020] Figure 4 shows a detailed view of the stirring structure in a flue gas purification device for desulfurization and denitrification.

[0021] Figure 5 is a partial view of the stirring structure in a flue gas purification device for desulfurization and denitrification.

[0022] In the diagram: 1. Purification tower body; 2. Inlet pipe; 3. Outlet pipe; 4. Slurry pipe; 5. Spray pipe; 6. Centrifugal pump; 7. Connecting pipe; 8. Positioning shaft; 801. Fixing frame; 802. Rotating rod; 803. Mixing plate; 804. Connecting frame; 805. Scraper; 806. Rotating blade; 807. Auxiliary block; 808. Mounting frame; 809. Filter screen; 810. Rotating frame; 811. Cleaning brush; 9. Fixing plate; 10. Nozzle; 11. Baffle plate; 12. Demister. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: Please refer to Figures 1 and 2. A flue gas purification device for desulfurization and denitrification includes a purification tower body 1. An air inlet pipe 2 is fixedly installed on the outer wall of the purification tower body 1. An air outlet pipe 3 is fixedly installed on the top of the purification tower body 1. A slurry pipe 4 for injecting catalyst is installed at the bottom of the air inlet pipe 2 and is fixedly connected to the outer wall of the purification tower body 1. A spray structure for auxiliary purification is fixedly installed in the inner cavity of the purification tower body 1.

[0025] The spray structure includes spray pipes 5, three sets of which are fixedly installed in the inner cavity of the purification tower body 1. A centrifugal pump 6 for conveying slurry is fixedly installed at the bottom of the outer wall of the purification tower body 1. One end of the spray pipe 5 passes through the purification tower body 1 and is fixedly connected to the output end of the centrifugal pump 6 through a connecting pipe 7. A stirring structure for promoting the mixing of flue gas and catalyst is fixedly installed at the bottom of the inner cavity of the purification tower body 1.

[0026] Specifically, the air inlet pipe 2 connects to the purification tower body 1 and the air outlet pipe 3 to form a flue gas inlet and outlet channel. The catalyst is injected into the tower through the slurry pipe 4 to assist the desulfurization and denitrification reaction. Together with the spray structure, the purification effect is improved.

[0027] More specifically, the three sets of spray pipes 5 are evenly distributed at a 120° angle in the horizontal direction to fully cover the cross-section of the purification tower body 1, ensuring that the slurry is evenly sprayed into the flue gas in the horizontal direction, so that the flue gas and slurry can fully contact and react. The three sets of spray pipes 5 are also distributed at intervals in the vertical direction, so that the slurry is sprayed densely at different heights, ensuring full contact and reaction with the flue gas and enhancing the reaction effect. The top end of the connecting pipe 7 is fixedly connected to the spray pipe 5, and its bottom end is fixedly connected to the output end of the centrifugal pump 6.

[0028] Example 2: Please refer to Figures 2, 3, 4, and 5. Based on Example 1, the stirring structure includes a positioning shaft 8. The bottom end of the positioning shaft 8 is fixedly connected to the bottom surface of the inner cavity of the purification tower body 1. A fixing frame 801 is fixedly sleeved on the outer wall of the positioning shaft 8. Three sets of rotating rods 802 are rotatably connected to the outer wall of the fixing frame 801 through bearings. Multiple sets of mixing plates 803 for assisting the mixing of flue gas and catalyst are fixedly installed on the outer wall of each set of rotating rods 802.

[0029] Specifically, three sets of mixing plates 803 are evenly distributed on the outer wall of the rotating rod 802, and are shaped like inclined blades. Their unique inclined structure allows the flue gas and the catalyst to continuously change their flow direction and velocity when they come into contact. When the fluid comes into contact with the mixing plate 803, it is divided into multiple fine streams. These streams shuttle and collide in the gaps between the plates, and then re-merge. In this process, the contact area between the flue gas and the catalyst is greatly increased, which promotes the full mixing of the two, improves the mixing efficiency and uniformity, and thus ensures that the subsequent treatment or reaction can proceed more stably and efficiently.

[0030] A connecting frame 804 is fixedly sleeved on the outer wall of the rotating rod 802. Both the upper and lower ends of the connecting frame 804 are fixedly installed with scrapers 805 for preventing slurry sedimentation. The scrapers 805 rotate synchronously with the rotating rod 802, which can effectively prevent slurry sedimentation during the rotation process.

[0031] Specifically, a rotating blade 806 for driving the connecting frame 804 to rotate is installed on one side of the connecting frame 804, and the rotating blade 806 is fixedly sleeved on the outer wall of the end of the rotating rod 802 away from the fixed frame 801.

[0032] More specifically, each of the two scrapers 805 is fixedly installed on the side away from each other to assist the scraper 805 in rotating smoothly. The outer wall of the auxiliary block 807 is rotatably installed with ball bearings, and the rolling of the ball bearings reduces the friction between the scraper 805 and the inner wall of the purification tower body 1.

[0033] The end of the rotating rod 802 away from the fixed frame 801 is rotatably connected to the mounting frame 808 for supporting the rotating rod 802 via a bearing, and the mounting frame 808 is fixedly connected to the inner wall of the purification tower body 1. A filter screen 809 for preventing the centrifugal pump 6 from getting clogged is fixedly installed on the side of the mounting frame 808 away from the purification tower body 1.

[0034] Specifically, the rotating blade 806 is located in the inner cavity of the filter screen 809. A rotating frame 810 is rotatably connected to one side of the filter screen 809, and the rotating frame 810 is fixedly sleeved on the outer wall of the rotating rod 802. A cleaning brush 811 is fixedly connected to the end of the rotating frame 810 away from the rotating rod 802, and the cleaning brush 811 is attached to the outer wall of the filter screen 809. The input end of the centrifugal pump 6 passes through the purification tower body 1 and is connected to the inner cavity of the filter screen 809.

[0035] Please refer to Figure 2. Three sets of fixing plates 9 for fixing and supporting the spray pipes 5 are fixedly installed on the inner wall of the purification tower body 1. Each set of fixing plates 9 is fixedly sleeved on the outer wall of the spray pipes 5. Multiple nozzles 10 are fixedly installed at the bottom end of each set of spray pipes 5.

[0036] A baffle 11 is fixedly installed on the inner wall of the purification tower body 1, and multiple demisters 12 for separation and demisting are fixedly installed in the inner cavity of the baffle 11.

[0037] The working principle of this utility model is as follows:

[0038] First, the flue gas enters the purification tower body 1 through the inlet pipe 2. At the same time, the slurry pipe 4 injects the catalyst into the tower to provide the necessary conditions for the desulfurization and denitrification reaction. The centrifugal pump 6 is started to transport the slurry to the spray pipe 5 through the connecting pipe 7. With the help of the nozzle 10 at the bottom, the slurry is evenly sprayed into the tower. The sprayed slurry comes into full contact with the flue gas and absorbs the sulfur and nitrogen oxides in the flue gas through chemical reaction, thus completing the initial purification.

[0039] Furthermore, when the centrifugal pump 6 is operating, it drives the rotating blade 806 to rotate, which in turn drives the rotating rod 802 to start rotating. The mixing plate 803 on the rotating rod 802 rotates accordingly, so that when the flue gas comes into contact with the catalyst, the fluid direction and flow rate change, increasing the contact area between the two and promoting thorough mixing. At the same time, the scraper 805 also rotates with the rotating rod 802 to prevent slurry sedimentation.

[0040] Then the input end of the centrifugal pump 6 is connected to the inner cavity of the filter screen 809. The filter screen 809 can prevent impurities in the slurry from entering the centrifugal pump 6 and causing blockage. When the rotating rod 802 rotates, it drives the rotating frame 810 to drive the cleaning brush 811 to rotate against the outer wall of the filter screen 809, and clean the impurities on the filter screen 809 in time to ensure its filtration effect.

[0041] Finally, the treated flue gas passes through the demister 12 inside the baffle 11 during its ascent. The demister 12 separates the water mist carried in the flue gas, and the purified flue gas is finally discharged from the purification tower body 1 through the exhaust pipe 3.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A flue gas purification device for desulfurization and denitrification, comprising a purification tower body (1), characterized in that, An air inlet pipe (2) is fixedly installed on the outer wall of the purification tower body (1), an air outlet pipe (3) is fixedly installed at the top of the purification tower body (1), a slurry pipe (4) for injecting catalyst is installed at the bottom of the air inlet pipe (2), and a spray structure for auxiliary purification is fixedly installed in the inner cavity of the purification tower body (1); the spray structure includes a spray pipe (5), three sets of the spray pipe (5) are provided and fixedly installed in the inner cavity of the purification tower body (1), a centrifugal pump (6) for conveying slurry is fixedly installed at the bottom of the outer wall of the purification tower body (1), one end of the spray pipe (5) passes through the purification tower body (1) and is fixedly connected to the output end of the centrifugal pump (6) through a connecting pipe (7), and a stirring structure for promoting the mixing of flue gas and catalyst is fixedly installed at the bottom of the inner cavity of the purification tower body (1).

2. The flue gas purification device for desulfurization and denitrification according to claim 1, characterized in that, The stirring structure includes a positioning shaft (8), the bottom end of which is fixedly connected to the bottom surface of the inner cavity of the purification tower body (1). A fixing frame (801) is fixedly sleeved on the outer wall of the positioning shaft (8). Three sets of rotating rods (802) are rotatably connected to the outer wall of the fixing frame (801). Multiple sets of mixing plates (803) for assisting the mixing of flue gas and catalyst are fixedly installed on the outer wall of each set of rotating rods (802).

3. The flue gas purification device for desulfurization and denitrification according to claim 2, characterized in that, The outer wall of the rotating rod (802) is fixedly fitted with a connecting frame (804). Both the upper and lower ends of the connecting frame (804) are fixedly installed with scrapers (805) for preventing slurry sedimentation. The scrapers (805) rotate synchronously with the rotating rod (802), which can effectively prevent slurry sedimentation during the rotation process.

4. A flue gas purification device for desulfurization and denitrification according to claim 2, characterized in that, The end of the rotating rod (802) away from the fixed frame (801) is rotatably connected to a mounting frame (808) for supporting the rotating rod (802). A filter screen (809) for preventing the centrifugal pump (6) from getting clogged is fixedly installed on the side of the mounting frame (808) away from the purification tower body (1).

5. A flue gas purification device for desulfurization and denitrification according to claim 1, characterized in that, The inner wall of the purification tower body (1) is fixedly installed with three sets of fixing plates (9) for fixing and supporting the spray pipe (5), and each set of fixing plates (9) is fixedly sleeved on the outer wall of the spray pipe (5). Multiple nozzles (10) are fixedly installed at the bottom end of each set of spray pipes (5).

6. The flue gas purification device for desulfurization and denitrification according to claim 1, characterized in that, The inner wall of the purification tower body (1) is fixedly installed with a partition (11), and a plurality of demisters (12) for separation and demisting are fixedly installed in the inner cavity of the partition (11).

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