Self-circulation energy-saving efficient treatment system

Abstract

The utility model relates to a self-circulation energy-saving efficient treatment system, which comprises a cylindrical absorption tower, a smoke inlet arranged at the bottom of the absorption tower and a smoke outlet arranged at the top of the absorption tower, and is characterized in that the absorption tower is cylindrical, and a driving shaft coaxial with the absorption tower is arranged in the absorption tower; a plurality of rotary vane discs are coaxially and fixedly mounted on the driving shaft, and avoiding gaps are formed between the outer wall surfaces of the rotary vane discs and the inner wall of the absorption tower; and liquid distribution pipes which are arranged at intervals in the circumferential direction of the rotary vane discs are arranged between any two adjacent rotary vane discs. According to the self-circulation energy-saving efficient treatment system designed by the utility model, part of discharged flue gas is dispersed into fine bubbles by utilizing the rotation of the multi-stage rotary vane disc and combining the aeration pipe arranged in the water return tank, and the fine bubbles are fully mixed with absorption liquid in the water return tank, so that the gas-liquid contact area is greatly increased, the gas-liquid contact time is greatly prolonged, and the gas-liquid mass transfer effect is enhanced; therefore, the desulfurization efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a self-circulating energy-saving and highly efficient treatment system. Background Art

[0002] In the prior art, with the acceleration of the industrialization process, flue gas emitted by industries such as coal-fired power plants, metallurgy, and chemical industries contains a large amount of sulfur dioxide (SO2) and nitrogen oxides (NOx), which cause serious pollution to the atmospheric environment and are the main causes of environmental problems such as acid rain and smog. Therefore, controlling and reducing the emissions of SO2 and NOx in industrial flue gas has become an important task of environmental protection.

[0003] Traditional flue gas desulfurization technologies include wet method, semi-dry method, dry method, etc. However, in order to improve the desulfurization efficiency, reduce the operation cost and reduce secondary pollution, researchers have been continuously exploring new technologies and processes. For example, some improved wet desulfurization technologies adopt high-efficiency absorption tower structures, such as cyclone plate towers, Venturi scrubbers, etc., to enhance gas-liquid contact and improve the absorption efficiency. However, these technologies still have some deficiencies. For example, the cyclone plate tower has a low pressure drop and is easy to be blocked, and the Venturi scrubber has a high energy consumption, etc. Content of the Utility Model

[0004] In order to solve the above problems, the utility model provides a self-circulating energy-saving and highly efficient treatment system with improved desulfurization efficiency and effective control of the total investment.

[0005] In order to achieve the above purpose, the self-circulating energy-saving and highly efficient treatment system designed by the utility model includes a cylindrical absorption tower, a smoke inlet arranged at the bottom of the absorption tower, and a smoke outlet arranged at the top of the absorption tower. It is characterized in that the absorption tower is cylindrical, and a driving shaft coaxial with the absorption tower is arranged inside the absorption tower. A plurality of rotating blade discs are coaxially and fixedly installed on the driving shaft. There is a clearance between the outer wall surface of the rotating blade disc and the inner wall of the absorption tower; a liquid distribution pipe is arranged between any two adjacent rotating blade discs at intervals along the circumferential direction of the rotating blade disc, and atomizing nozzles are arranged on both the upper and lower sides of the liquid distribution pipe; a water return tank is arranged below each rotating blade disc. The water return tank is a ring-shaped structure fixed on the inner wall of the absorption tower, and the width of the notch of the water return tank is greater than the width of the clearance; an annular aeration pipe is arranged in the water return tank, and the smoke outlet is connected with a first smoke exhaust branch pipe communicated with the annular aeration pipe. An induced draft fan is arranged on the first smoke exhaust branch pipe for sending part of the flue gas discharged from the smoke outlet into the annular aeration pipe.

[0006] In order to improve the aeration efficiency, the air holes of the annular aeration pipe are arranged towards the bottom surface of the notch of the water return tank.

[0007] In order to prevent impurities from accumulating in the water return tank, the bottom surface of the notch of the water return tank is in an inverted conical shape.

[0008] In order to further enhance the discharge of impurities and waste liquid, the return water tank is arranged in an overall tilted manner in the absorption tower, and a drainage outlet is provided at the lowest point in the return water tank.

[0009] In order to ensure sufficient liquid reflux, the width of the notch of the water return groove is twice the width of the clearance gap.

[0010] In order to simply and effectively provide support and drive for the drive shaft, a support bracket is fixedly installed in the absorption tower, and a lower bearing seat is arranged on the support bracket. The bottom end of the drive shaft is rotatably connected with the lower bearing seat, and the top end of the drive shaft extends out of the absorption tower and is rotatably connected with the upper bearing seat at the top of the absorption tower. A variable frequency motor for driving the drive shaft to rotate is also arranged on the top of the absorption tower, and the power output end of the variable frequency motor is connected with the drive shaft through a transmission mechanism.

[0011] In order to improve the treatment effect and environmental protection performance, a demister is also included, and the demister is arranged between the rotary blade disk at the top of the drive shaft and the smoke exhaust port.

[0012] In order to facilitate cleaning and discharge, a liquid collecting pool connected to a drain outlet is also provided at the bottom of the absorption tower. The liquid collecting pool adopts a cone bottom design with a cone angle of more than 45 degrees.

[0013] In order to reduce the absolute moisture content of the exhausted smoke, a heat exchanger, a mixing box and a water pump are also included. The smoke exhaust port has two branches, one branch is connected to the first smoke exhaust branch pipe, and the other is connected to the second smoke exhaust branch pipe. The second smoke exhaust branch pipe is connected to the air inlet end of the heat exchanger, the water inlet end of the heat exchanger is connected to an external water source, and the water outlet end of the heat exchanger is connected to a mixing box, and the mixing box is connected to the liquid distribution pipe through a water pump.

[0014] The self-circulating energy-saving and efficient treatment system designed by the utility model utilizes the rotation of multi-stage rotary blade disks to guide the absorption liquid into the annular return water tank located below each rotary blade disk, and utilizes the aeration pipe arranged in the return water tank to disperse part of the exhausted flue gas into fine bubbles, and fully mixes them with the absorption liquid in the return water tank, so as to greatly increase the gas-liquid contact area and contact time, enhance the gas-liquid mass transfer effect, and thus greatly improve the desulfurization efficiency; at the same time, the system integrates multiple treatment units such as absorption, aeration regeneration, and liquid circulation into a compact tower body. This integrated design not only significantly reduces the system's footprint and the number of equipment, making it easier to use in projects with limited sites, but also reduces construction and installation costs, and effectively controls the total investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the planar structure of the self-circulating energy-saving and efficient treatment system provided in the embodiment of the present application;

[0016] Figure 2 It is another schematic diagram of the water return tank provided by the embodiment of the present application;

[0017] Figure 3 It is another structural block diagram of the self-circulating energy-saving and high-efficiency treatment system provided by the embodiment of the present application.

[0018] Wherein: absorption tower 10, smoke inlet 11, smoke outlet 12, first smoke exhaust branch pipe 121, induced draft fan 122, second smoke exhaust branch pipe 123, support bracket 13, demister 14, liquid collection tank 15, drive shaft 20, lower bearing seat 21, upper bearing seat 22, variable frequency motor 23, rotary blade disc 30, liquid distribution pipe 40, water return tank 50, annular aeration pipe 51, heat exchanger 60, mixing tank 61, water pump 62, second heat exchanger 70. Detailed implementation manners

[0019] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustration and explanation of the present utility model, and are not used to limit the present utility model.

[0020] As Figures 1 to 3 shown, the self-circulating energy-saving and high-efficiency treatment system described in this embodiment includes a cylindrical absorption tower 10, a smoke inlet 11 provided at the bottom of the absorption tower 10, and a smoke outlet 12 provided at the top of the absorption tower 10. The absorption tower 10 is cylindrical, and a drive shaft 20 coaxially arranged with the absorption tower 10 is provided inside the absorption tower 10. A plurality of rotary blade discs 30 are coaxially and fixedly installed on the drive shaft 20. There is a clearance between the outer wall surface of the rotary blade disc 30 and the inner wall of the absorption tower 10; a liquid distribution pipe 40 arranged at intervals along the circumferential direction of the rotary blade disc 30 is provided between any two adjacent rotary blade discs 30. Atomizing nozzles are provided on both the upper and lower sides of the liquid distribution pipe 40; a water return tank 50 is provided below each rotary blade disc 30. The water return tank 50 is a ring-shaped structure fixed on the inner wall of the absorption tower 10, and the width of the notch of the water return tank 50 is greater than the width of the clearance; an annular aeration pipe 51 is provided in the water return tank 50. The smoke outlet 12 is connected to a first smoke exhaust branch pipe 121 communicated with the annular aeration pipe 51, and an induced draft fan 122 for sending a part of the smoke discharged from the smoke outlet 12 into the annular aeration pipe 51 is provided on the first smoke exhaust branch pipe 121.

[0021] During specific implementation, as Figure 1As shown, a support bracket 13 is fixedly installed inside the absorption tower 10. A lower bearing block 21 is arranged on the support bracket 13. The bottom end of the drive shaft 20 is rotationally connected to the lower bearing block 21. The top end of the drive shaft 20 extends out of the absorption tower 10 and is rotationally connected to an upper bearing block 22 at the top of the absorption tower 10. A frequency conversion motor 23 for driving the drive shaft 20 to rotate is also arranged at the top of the absorption tower 10. The power output end of the frequency conversion motor 23 is connected to the drive shaft 20 through a transmission mechanism (such as a belt, a gear, etc.). This driving method is simple and effective, and can reliably drive the drive shaft 20 and the rotary vane disc 30 thereon to rotate.

[0022] During the working process, the flue gas to be treated enters from the flue gas inlet 11 at the bottom of the absorption tower 10, and the purified flue gas is discharged from the smoke exhaust port 12 at the top of the absorption tower 10. The drive shaft 20 drives a plurality of uniformly distributed rotary vane discs 30 to rotate together. And there is a certain clearance between the outer wall surface of the rotary vane disc 30 and the inner wall of the absorption tower 10 to ensure that the rotary vane disc 30 can rotate smoothly.

[0023] In this embodiment, a plurality of vertically arranged blades are installed on each rotary vane disc 30. This vertical arrangement method will not generate resistance to the upward flow of the flue gas. And when the flue gas flows upward from the flue gas inlet 11 to the smoke exhaust port 12, it will pass through each rotary vane disc 30. Between two adjacent rotary vane discs 30, the atomizing nozzles on the upper and lower sides of the liquid distribution pipe 40 spray the absorption liquid into fine droplets. These droplets fall on the blades of the rotary vane disc 30. Under the action of centrifugal force and liquid surface tension, they quickly spread into a thin and uniform dynamic liquid film, covering the entire blade surface. This greatly increases the gas-liquid contact area and promotes the reaction between pollutants (such as sulfur) in the flue gas and the absorption liquid.

[0024] The reacted absorption liquid is thrown out from the outer edge of the blade under the action of centrifugal force, impacts the inner wall of the absorption tower 10, and flows along the inner wall into the lower annular water return tank 50. The width of the notch of the water return tank 50 is greater than the gap between the rotary vane disc 30 and the inner wall of the absorption tower 10, ensuring that all the thrown-out absorption liquid can be effectively collected.

[0025] In addition, an annular air pipe 51 is arranged in each water return tank 50. The induced draft fan 122 introduces a part of the purified flue gas from the smoke exhaust port 12 into the annular air pipe 51 through the first smoke exhaust branch pipe 121. These purified flue gases are released into the absorption liquid in the water return tank 50 in the form of fine bubbles from the air holes of the air pipe 51, aerating the absorption liquid, improving the utilization rate of the absorption liquid, and thus further improving the flue gas desulfurization efficiency.

[0026] In some embodiments, the aeration holes of the annular aeration pipe 51 are arranged toward the bottom surface of the return tank 50. With this structural design, after the induced draft fan 122 delivers part of the purified flue gas into the annular aeration pipe 51, the gas enters the return tank 50 through the aeration holes to form a large number of fine bubbles, which will continuously escape upward due to the buoyancy, and fully contact and mix with the absorption liquid (such as limestone slurry) in the return tank 50 during the rising process, which can extend the gas-liquid contact time, thereby further improving the desulfurization efficiency. In addition, the formation of a large number of fine bubbles acts as a miniature "agitator" in the return tank 50, which keeps the absorption liquid in the return tank 50 in a state of continuous disturbance, that is, this disturbance can effectively prevent the desulfurization reaction products (such as gypsum) from depositing and scaling at the bottom of the return tank 50, thereby avoiding the blockage of the return tank 50 and reducing the system maintenance frequency and operating costs.

[0027] In some embodiments, Figure 1 As shown, in order to prevent impurities from accumulating in the return water tank 50, the bottom surface of the return water tank 50 is in an inverted cone shape. The inverted cone-shaped bottom of the tank makes it difficult for impurities to accumulate at the bottom, that is, due to the effect of gravity, the impurities will naturally slide to the lowest point of the cone, avoiding the problem of excessive impurity deposition surface and scaling that may occur in a flat-bottomed return water tank, thereby reducing the risk of clogging.

[0028] In this embodiment, if Figure 2 As shown, the return water tank 50 is arranged in an inclined manner in the absorption tower 10, and a drain outlet is provided at the lowest point in the return water tank 50. The inclined return water tank 50 and the drain outlet at the lowest point can more effectively utilize the gravity to make impurities and waste liquid flow to the drain outlet along the inclined tank bottom, thereby achieving more thorough discharge, avoiding the accumulation of impurities and waste liquid in the return water tank 50, and greatly reducing the time and labor cost required for maintenance.

[0029] In some embodiments, the width of the slot of the water return groove 50 is twice the width of the clearance gap. A wider slot can accommodate more absorption liquid thrown out from the rotary blade disk 30, and even in the case of high-speed rotation or large liquid flow, it can ensure that the absorption liquid is completely collected to improve the utilization rate of the absorption liquid.

[0030] In some embodiments, Figure 1As shown, it further includes a demister 14, and the demister 14 is arranged between the impeller disc 30 at the topmost part of the drive shaft 20 and the smoke exhaust port 12. The demister 14 is mainly composed of fixing devices such as corrugated blades, plate pieces, and clamping bars. In the flue gas after desulfurization, "fog" with a particle size of 10 - 60 microns is easily generated. The "fog" not only contains moisture, but also dissolves sulfuric acid, sulfates, sulfur dioxide, etc. At the same time, it also causes the soiling and serious corrosion of the fan and the flue. The demister 14 can effectively capture these liquid droplets, reduce the loss of the absorption liquid, and reduce the moisture content of the flue gas.

[0031] In some embodiments, as Figure 1 shown, a liquid collecting pool 15 communicating with the drainage port is further provided at the bottom of the absorption tower 10. The liquid collecting pool 15 adopts a conical bottom design with a cone angle > 45°. In this way, the setting of the liquid collecting pool 15 can, on the one hand, collect the absorption liquid that is thrown out by the impeller disc 30 in the absorption tower 10 and not collected by the water return tank 50, and on the other hand, communicate with the drainage port of the water return tank 50, so that the waste liquid can be more concentratedly converged into the liquid collecting pool 15 for unified discharge and treatment. The cone angle design greater than 45° is more conducive to the impurities and sediments sliding towards the cone bottom and preventing them from adhering to the pool wall.

[0032] In some embodiments, as Figure 3 shown, it further includes a heat exchanger 60, a mixing tank 61, and a water pump 62. The smoke exhaust port 12 has two branches. One branch is connected to the first smoke exhaust branch pipe 121, and the other branch is connected to a second smoke exhaust branch pipe 123. The second smoke exhaust branch pipe 123 is connected to the air inlet end of the heat exchanger 60. The water inlet end of the heat exchanger 60 is connected to an external water source, the water outlet end of the heat exchanger 60 is connected to the mixing tank 61, and the mixing tank 61 is connected to the liquid distribution pipe 40 through the water pump 62.

[0033] With this structural design, after the discharged flue gas passes through the heat exchanger 60, its temperature decreases, and part of the water vapor in it condenses into liquid water, thereby reducing the absolute moisture content of the discharged flue gas. 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. Through the external water source and the mixing tank 61, the absorption liquid can be mixed evenly to maintain the liquid level and concentration of the absorption liquid, ensuring the stable operation of the system. The water pump 62 provides power for the absorption liquid.

[0034] The self-circulating energy-saving and highly efficient treatment system provided by this embodiment utilizes the rotation of multiple-stage rotary vane discs to guide the absorption liquid into the annular water return tank located below each rotary vane disc, and uses the aeration pipes arranged in the water return tank to disperse part of the discharged flue gas into fine bubbles, which are fully mixed with the absorption liquid in the water return tank, so as to greatly increase the gas-liquid contact area and contact time, strengthen the gas-liquid mass transfer effect, and thus greatly improve the desulfurization efficiency. At the same time, this system integrates multiple treatment units such as absorption, aeration regeneration, and liquid circulation in a compact tower body. This integrated design not only significantly reduces the floor area and the number of equipment of the system, making it easier to be applied in projects with limited space, but also reduces the construction and installation costs and effectively controls the total investment.

[0035] 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. It 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.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", and "couple" 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 situations.

[0037] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-circulating energy-saving and highly efficient treatment system, comprising a cylindrical absorption tower, a smoke inlet provided at the bottom of the absorption tower, and a smoke outlet provided at the top of the absorption tower, characterized in that, The absorption tower is cylindrical, and a driving shaft coaxially arranged with the absorption tower is provided in the absorption tower, and a plurality of rotary blade disks are coaxially fixedly installed on the driving shaft, and a clearance is provided between the outer wall surface of the rotary blade disk and the inner wall of the absorption tower; a liquid distribution pipe arranged at intervals along the circumference of the rotary blade disk is provided between any two adjacent rotary blade disks, and atomizing nozzles are provided on the upper and lower sides of the liquid distribution pipe; a return water trough is provided under each rotary blade disk, and the return water trough is an annular structure fixed on the inner wall of the absorption tower, and the groove width of the return water trough is greater than the width of the clearance; an annular aeration pipe is provided in the return water trough, and the smoke exhaust port is connected to a first smoke exhaust branch pipe connected to the annular aeration pipe, and the first smoke exhaust branch pipe is provided with an induced draft fan for sending part of the smoke discharged from the smoke exhaust port into the annular aeration pipe.

2. The self-circulating energy-saving and highly efficient treatment system according to claim 1, wherein The aeration holes of the annular aeration pipe are arranged toward the bottom surface of the return water tank.

3. The self-circulating energy-saving and highly efficient treatment system according to claim 2, wherein The bottom surface of the return water tank is in an inverted cone shape.

4. The self-circulating energy-saving and highly efficient treatment system according to claim 3, wherein, The return water tank is arranged in an overall tilted manner in the absorption tower, and a drainage outlet is arranged at the lowest point in the return water tank.

5. The self-circulating energy-saving and highly efficient processing system according to claim 1, characterized in that, The width of the notch of the water return groove is twice the width of the clearance gap.

6. The self-circulating energy-saving and highly efficient treatment system according to claim 1, wherein, A support bracket is fixedly installed in the absorption tower, and a lower bearing seat is arranged on the support bracket. The bottom end of the drive shaft is rotatably connected with the lower bearing seat, and the top end of the drive shaft extends out of the absorption tower and is rotatably connected with the upper bearing seat at the top of the absorption tower. A variable frequency motor for driving the drive shaft to rotate is also arranged at the top of the absorption tower, and the power output end of the variable frequency motor is connected with the drive shaft through a transmission mechanism.

7. The self-circulating energy-saving and highly efficient treatment system according to claim 1, wherein It also includes a demister, which is arranged between the rotary blade disk at the top of the drive shaft and the smoke exhaust port.

8. The self-circulating energy-saving and highly efficient treatment system according to claim 4, wherein A liquid collecting pool connected to the drain outlet is also provided at the bottom of the absorption tower. The liquid collecting pool adopts a cone bottom design with a cone angle of more than 45 degrees.

9. The self-circulating energy-saving and highly efficient treatment system according to any one of claims 1-8, characterized in that It also includes a heat exchanger, a mixing box and a water pump. The smoke exhaust port has two branches, one branch is connected to a first smoke exhaust branch pipe, and the other is connected to a second smoke exhaust branch pipe. The second smoke exhaust branch pipe is connected to the air inlet end of the heat exchanger, the water inlet end of the heat exchanger is connected to an external water source, and the water outlet end of the heat exchanger is connected to a mixing box. The mixing box is connected to the liquid distribution pipe through a water pump.

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