Rotary mixed type flue gas efficient distribution device

Abstract

The invention relates to the technical field of flue gas treatment, and discloses a rotary mixed type flue gas efficient distribution device which comprises a frame assembly, the frame assembly comprises a cylinder body, a gas inlet is formed in the top of the cylinder body and communicated with a flue gas inlet pipeline, a gas outlet is formed in the bottom of the cylinder body, and a gas outlet is formed in the top of the cylinder body and communicated with the flue gas inlet pipeline; the gas outlet is communicated with the top of the flue gas deacidification reaction tower; the mixing assembly is arranged on the cylinder body; the distribution assembly is arranged in the cylinder body and located between the mixing assembly and the gas outlet, the flue gas can be guided to form tangential rotation to enter a reaction tower by introducing a bent pipe and guide vanes, and it is ensured that the flue gas is evenly distributed on the whole section; the method has the effects of prolonging the continuous and stable operation time of the whole deacidification system, improving the deacidification reaction efficiency, reducing the adhesion of fly ash to the tower wall, reducing the operation cost of a power plant and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and in particular to a rotary mixing type flue gas efficient distribution device. Background Art

[0002] The semi-dry deacidification reaction tower of a waste incineration power plant is a device used to remove acidic gases such as HCl and HF from the flue gas generated during the waste incineration process. This reaction tower combines the advantages of dry and wet deacidification, using a slurry containing alkaline substances to neutralize the acidic gases. In the semi-dry deacidification reaction tower, lime slurry is sprayed into fine droplets through an atomizer and fully contacts the hot flue gas entering the tower. Due to the high temperature of the flue gas, the water evaporates rapidly, resulting in the final reaction products being dry or near-dry. These dry reaction products can be more easily collected and processed, and the purified flue gas is discharged into the atmosphere through the smoke exhaust pipe.

[0003] The flue gas inlet design of the deacidification reaction tower is particularly important for the flow path of the flue gas. If the inlet design does not match the main body of the reaction tower, the flue gas flow entering the tower will be unevenly distributed. In this case, the flue gas is likely to form a local high-speed channel, directly impacting the tower wall or certain specific areas, while other areas will experience air flow stagnation or even eddy currents, resulting in obvious deviation problems. The consequences of deviation include: insufficient contact between the flue gas and the injected cooling water and alkaline agent droplets, affecting the heat transfer and deacidification reaction efficiency, and leading to an increase in the acid gas concentration at the system outlet; at the same time, in some areas, due to insufficient flue gas residence time, the cooling water fails to evaporate completely, and the residual moisture is easily combined with fly ash and attached to the tower wall, causing agglomeration, blockage and even corrosion. In severe cases, the equipment will be shut down for maintenance, increasing operating and maintenance costs and affecting the continuous and stable operation of the entire incineration system. Summary of the Invention

[0004] The present invention is a rotary mixing type flue gas efficient distribution device, the purpose of which is to ensure that the flow field of the flue gas after entering the deacidification reaction tower is uniform and no deviation occurs, while reducing dust accumulation in the equipment, ensuring the long-term stable operation of the deacidification system, improving the deacidification reaction efficiency, and reducing the operating costs of the power plant.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A rotary mixing type flue gas efficient distribution device comprises: a frame assembly, the frame assembly comprising a barrel body, an air inlet being provided at the top of the barrel body, the air inlet being connected to a flue gas inlet pipe, an air outlet being provided at the bottom of the barrel body, the air outlet being connected to the top of a flue gas deacidification reaction tower; a mixing assembly being arranged on the barrel body; and a distribution assembly being arranged inside the barrel body and located between the mixing assembly and the air outlet.

[0007] As a preferred technical scheme of the present application, the distribution assembly comprises: a mounting ring, the outer side of which is fixed to the inner side of the barrel body; a connecting ring, which is arranged inside the mounting ring, and the mounting ring, the connecting ring and the barrel body are coaxially arranged; a plurality of guide vanes, which are fixedly connected between the mounting ring and the connecting ring.

[0008] As a preferred technical scheme of the present application, the guide vanes are fixedly connected with the mounting ring and the connecting ring by welding, and all the guide vanes are arranged at equal distances in a circumferential direction.

[0009] As a preferred technical scheme of the present application, the guide vanes are arranged in a fan shape, and the guide vanes are arranged in an inclined manner.

[0010] As a preferred technical scheme of the present application, the mixing assembly comprises: a gas main pipe, into which inert gas is introduced; a plurality of branch pipes, which are in communication with the gas main pipe, the branch pipes extending into the interior of the barrel body, and the branch pipes being fixed to the barrel body; a plurality of elbow pipes, which are arranged in the interior of the barrel body, and the elbow pipes being in communication with the branch pipes.

[0011] As a preferred technical scheme of the present application, all the elbow pipes are arranged in a circumferential array, and the outlet direction of the elbow pipes is offset from the central axis of the barrel body.

[0012] As a preferred technical scheme of the present application, the elbow pipes are arranged in an inclined downward manner.

[0013] As a preferred technical scheme of the present application, the gas main pipe is sequentially provided with an electrically operated on-off valve, an electrically operated regulating valve, a pressure reducing valve, a pressure gauge, a pressure transmitter, a flow meter and a check valve in the direction of gas flow.

[0014] As a preferred technical scheme of the present application, the side wall of the barrel body is fixed with a plurality of reinforcing ribs for improving the structural stability.

[0015] As a preferred technical scheme of the present application, the bottom of the barrel body is provided with an expansion joint, and the gas outlet is in communication with the interior of the flue gas deacidification reaction tower through the expansion joint.

[0016] The present application has the following advantages:

[0017] 1. Uniform distribution of flue gas flow field: By introducing a rotating mixed flue gas efficient distribution device, the flue gas will be reorganized into a more uniform flow state before entering the deacidification reaction tower. The device is designed with components such as guide vanes to guide the flue gas to form a tangential rotation into the reaction tower, ensuring uniform distribution of the flue gas across the entire cross section. This effectively avoids the formation of local high-speed channels and reduces the possibility of direct impact on the tower wall. It also eliminates stagnation zones and eddy currents, ensuring optimal contact conditions between the flue gas, cooling water, and alkaline reagent droplets.

[0018] 2. Improved deacidification efficiency: Since the flue gas can more evenly contact the injected cooling water and deacidification neutralizer, the chemical reaction efficiency is greatly improved. In particular, the present invention uses inert gas for mixing interference, which not only helps the flue gas flow field to be more uniform, but also can prevent dust accumulation in the equipment to a certain extent, thereby maintaining long-term stable operation. In addition, the improved flow field design increases the residence time of the flue gas, which helps to further improve the deacidification efficiency and reduce the acid gas concentration at the system outlet, meeting higher environmental protection standards.

[0019] 3. Reduced agglomeration and blockage risks: The optimized flue gas inlet design promotes full mixing of flue gas with cooling water and deacidification neutralizer, ensuring complete evaporation of cooling water and preventing unevaporated water from combining with fly ash and adhering to the tower wall to form agglomerations or blockages. This design significantly reduces the risk of corrosion caused by residual moisture, lowers maintenance costs and downtime frequency, and ensures continuous and stable operation of the system.

[0020] 4. Extend equipment service life: The specially shaped guide vanes reduce resistance loss while providing excellent gas control characteristics, operating within a limited gas pressure drop range. This design not only enhances wear resistance but also protects key components from fly ash erosion, extending the overall service life of the equipment. In addition, the design without moving parts simplifies maintenance procedures and reduces operating costs.

[0021] 5. Flexible adjustment to adapt to different working conditions: The flue gas distribution device is equipped with control systems such as pressure reducing valves, regulating valves and flow meters, which can flexibly adjust the pressure, temperature and flow of the introduced inert gas according to the actual working conditions. This means that regardless of changes in load or other external conditions, the optimal operating parameters can be maintained to ensure the efficient and stable operation of the deacidification system, while also leaving room for possible technological upgrades in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of this specification, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a schematic structural diagram of a rotary mixing type flue gas efficient distribution device proposed by the present invention;

[0024] Figure 2 Schematic diagram of the structure inside the cylinder body;

[0025] Figure 3 for Figure 2 AA cross-section diagram;

[0026] Figure 4 Schematic diagram of the structure of the guide vane;

[0027] Figure 5 for Figure 2 BB cross-section diagram;

[0028] Figure 6 It is a structural diagram of the elbow;

[0029] Figure 7 This is a flow chart of the gas introduction system;

[0030] Figure 8 This is the flow field diagram for flue gas simulation;

[0031] Figure 9 This is the simulated flow field diagram of flue gas entering the reaction tower.

[0032] In the figure: 11 cylinder body, 12 air inlet, 13 air outlet, 21 gas main pipe, 211 stop valve, 212 electric on / off valve, 213 electric regulating valve, 214 pressure reducing valve, 215 pressure gauge, 216 pressure transmitter, 217 flow meter, 218 check valve, 22 branch pipe, 23 elbow, 31 mounting ring, 32 guide vane, 33 connecting ring, 4 reinforcing ribs, 5 expansion joint. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Please see the attached Figure 1 -Attached Figure 6 , a rotary mixing type flue gas efficient distribution device, including a frame component, a mixing component and a distribution component:

[0035] Wherein, please refer to the attached Figure 1 , the frame assembly includes a cylinder body 11, the cross section of the cylinder body 11 is a circular ring structure, the top of the cylinder body 11 is provided with an air inlet 12, the air inlet 12 is connected with the flue gas inlet pipeline, the bottom of the cylinder body 11 is provided with an air outlet 13, the air outlet 13 is connected with the top of the flue gas deacidification reaction tower, the pipe diameter of the air inlet 12 is larger than the pipe diameter of the air outlet 13, and the whole is a funnel structure, in addition, a plurality of reinforcing ribs 4 are fixed on the outside of the cylinder body 11 and arranged at equal intervals in the circumferential direction, for improving the stability of the overall structure of the device, the bottom of the cylinder body 11 is provided with an expansion joint 5, the expansion joint 5 is connected with the air outlet 13, for absorbing the deformation of the connection between the cylinder body 11 and the reaction tower, and ensuring the stable connection of the device.

[0036] Wherein, please refer to the attached Figure 2 -attached Figure 4 , the mixing assembly is arranged on the straight section of the cylinder body 11, for mixing and interfering with the flue gas, guiding the flue gas to form a tangential rotation into the reaction tower, the mixing assembly includes a gas main pipe 21, inert gas such as nitrogen or compressed air is introduced into the inside of the gas main pipe 21, the main purpose of using inert gas is to not affect the components of the original flue gas, while controlling the flow to ensure that the temperature of the original flue gas does not decrease too much, a plurality of branch pipes 22 are connected and communicated on the gas main pipe 21, the branch pipes 22 extend to the inside of the cylinder body 11, and the connection between the two is sealingly and fixedly connected, the end of the branch pipe 22 is connected and communicated with an elbow pipe 23, the elbow pipes 23 are arranged in a circumferential array inside the cylinder body 11, and there is an included angle α between the elbow pipes 23 and the center of the circle in the horizontal plane, in addition, the elbow pipes 23 are arranged to be inclined downward along the gas ejection direction, and the included angle between the elbow pipes 23 and the horizontal plane is an inclination angle β, specifically, the number of the elbow pipes 23 is four, the included angle α is 60°, and the inclination angle β is 5°, further, the pipe diameter of the elbow pipes 23 gradually decreases along the gas ejection direction, based on the continuity equation and Bernoulli principle in fluid mechanics, this design can increase the gas flow rate, and further interfere with the flow direction of the original flue gas, and to a certain extent, blow away the accumulated ash in the equipment, the mixing assembly can mix and locally interfere with the flow of the flue gas on the one hand, and form a cyclone with a certain speed to blow away the fly ash accumulated in the equipment into the reaction tower as much as possible on the other hand, so as to protect the equipment and enable it to operate stably for a long time.

[0037] Wherein, please refer to the attached Figure 5 and attached Figure 6The distribution component is arranged inside the cylinder body 11 and between the mixing component and the air outlet 13 to further disperse the smoke. The distribution component includes a mounting ring 31 and a connecting ring 33, and both are coaxially arranged with the cylinder body 11. The connecting ring 33 is located inside the mounting ring 31 and plays a connecting role. The mounting ring 31 is fixed to the inner side of the cylinder body 11 by bolts. A number of guide blades 32 are fixed between the mounting ring 31 and the connecting ring 33. The guide blades 32 are arranged equidistantly in the circumferential direction. The guide blades 32 are fan-shaped and are fixed to the mounting ring 31 and the connecting ring 33 by welding. In addition, the guide blades 32 are tilted. Specifically, the number of guide blades 32 is 16, and the fan-shaped vertex angle of the guide blades 32 is 0. The guide blade 32 has an inclination angle of γ=45°, which makes the guide blade 32 streamlined and reduces the resistance loss, so that it provides good gas control characteristics within a limited gas pressure drop range. The component can distribute and rectify the flue gas flow direction again, so that the flue gas forms a more ideal flow field after entering the deacidification reaction tower, and forms an umbrella-shaped cloud surface in the reaction tower, which is evenly mixed with the atomized cooling water and deacidification neutralizer sprayed into the reaction tower. It can not only quickly cool the flue gas temperature and completely evaporate the atomized cooling water, but also avoid the incompletely evaporated droplets entraining fly ash in the flue gas and forming agglomeration on the tower wall, but also achieve a high-efficiency deacidification reaction and reduce the consumption of deacidification neutralizer, so as to achieve the purpose of long-term stable operation.

[0038] For further information, please see the attached Figure 7 On the gas main pipe 21, an electric switch valve 212, an electric regulating valve 213, a pressure reducing valve 214, a pressure gauge 215, a pressure transmitter 216, a flow meter 217 and a check valve 218 are sequentially arranged along the gas flow direction. The pressure transmitter 216 is used to monitor the gas pressure. The pressure reducing valve 214 cooperates with the pressure transmitter 216 to adjust the gas pressure. The flow meter 217 is used to monitor the gas flow. The electric regulating valve 213 adjusts the gas flow according to the data monitored by the flow meter 217. The check valve 218 is used to maintain positive pressure inside the equipment under abnormal operating conditions to prevent gas backflow. Specifically, the pressure of the introduced gas is stable in the range of 0.3-0.4 MPa, the temperature is at room temperature, and the flow rate is controlled within the range of 1-2% of the flue gas volume, and can be adjusted in the control system according to actual operating conditions. In addition, a manually controlled shut-off valve 211 is provided between the gas inlet end, the electric switch valve 212, the electric regulating valve 213, the pressure reducing valve 214 and the pressure gauge 215 to ensure stable operation of the pipeline.

[0039] For further information, please see the attached Figure 8 and attached Figure 9The smoke velocity vector distribution of the smoke distribution device is simulated by computer CFD flow field. Computational fluid dynamics, referred to as CFD, is a technology that uses numerical analysis methods to solve fluid flow problems. It predicts and visualizes the flow behavior of the fluid through computer simulation. The simulation software used is ANSYS Fluent. Figure 8 The left side of the figure is the simulated flow field of the smoke at the air inlet 12 of the smoke distribution device, and the right side is the simulated flow field of the smoke at the air outlet 13. It can be seen from the figure that the distribution of the lower layer of smoke at the outlet is very uniform. Figure 9 It can be seen that the airflow distribution is uniform and the flue gas flow field is better.

[0040] Working principle: Before the flue gas enters the deacidification reaction tower from the flue, it first enters the flue gas distribution device proposed in the present invention. Specifically, the flue gas enters the interior of the cylinder body 11 through the air inlet 12, and at the same time, the compressed inert gas enters through the gas main pipe 21, and is quickly ejected through the branch pipe 22 and the elbow 23. The ejected gas can mix and rectify the flue gas, and guide the flue gas to rotate and move downward. Then the mixed gas passes through the distribution component and is diverted and guided by the guide vane 32. The mixed gas rotates downward and enters the reaction tower through the air outlet 13, and is dispersed in the reaction tower to ensure sufficient contact between the flue gas and the treatment liquid.

[0041] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A rotary mixing type flue gas efficient distribution device, comprising: A frame assembly, the frame assembly comprising a cylinder body (11), an air inlet (12) provided at the top of the cylinder body (11), the air inlet (12) being connected to a flue gas inlet pipe, and an air outlet (13) provided at the bottom of the cylinder body (11), the air outlet (13) being connected to the top of a flue gas deacidification reaction tower; A mixing assembly is provided on the barrel body (11) and is used to mix the flue gas and guide the flue gas to form a tangential rotation and enter the reaction tower; The distribution component is arranged inside the barrel body (11) and located between the mixing component and the gas outlet (13). The distribution component includes a plurality of guide vanes (32) for guiding the smoke.

2. A rotary mixing type flue gas efficient distribution device according to claim 1, characterized in that: The distribution component also includes: a mounting ring (31), the outer side of the mounting ring (31) being fixed to the inner side of the barrel body (11); The connecting ring (33) is arranged inside the mounting ring (31), and the mounting ring (31), the connecting ring (33), and the barrel body (11) are all coaxially arranged; The guide vanes (32) are fixedly connected between the mounting ring (31) and the connecting ring (33).

3. A rotary mixing type flue gas efficient distribution device according to claim 2, characterized in that: The guide blades (32) are fixedly connected to the mounting ring (31) and the connecting ring (33) respectively by welding, and all the guide blades (32) are arranged at equal intervals in the circumferential direction.

4. A rotary mixing type flue gas efficient distribution device according to claim 3, characterized in that: The guide blades (32) are fan-shaped and arranged obliquely.

5. The rotary mixing type flue gas efficient distribution device according to claim 4, characterized in that: The mixing assembly comprises: A gas main (21) through which inert gas is introduced; A plurality of branch pipes (22) are connected to the gas main pipe (21), the branch pipes (22) extend into the interior of the cylinder body (11), and the branch pipes (22) are fixed to the cylinder body (11); A plurality of curved pipes (23) for guiding the direction of smoke flow are all arranged inside the cylinder body (11), and the curved pipes (23) are connected to the branch pipes (22).

6. A rotary mixing type flue gas efficient distribution device according to claim 5, characterized in that: All of the curved pipes (23) are arranged in a circumferential array, and the outlet directions of the curved pipes (23) are staggered with the central axis of the cylinder body (11).

7. The rotary mixing type flue gas efficient distribution device according to claim 6, characterized in that: The curved pipe (23) is arranged to be tilted downward along the gas ejection direction.

8. The rotary mixing type flue gas efficient distribution device according to claim 7, characterized in that: An electric switch valve (212), an electric regulating valve (213), a pressure reducing valve (214), a pressure gauge (215), a pressure transmitter (216), a flow meter (217), and a check valve (218) are sequentially arranged on the gas main pipe (21) along the gas flow direction, for adjusting the pressure and flow of the introduced gas.

9. The rotary mixing type flue gas efficient distribution device according to claim 8, characterized in that: A plurality of reinforcing ribs (4) for providing a delivery device and structural stability are fixed to the side wall of the cylinder body (11).

10. The rotary mixing type flue gas efficient distribution device according to claim 9, characterized in that: An expansion joint (5) is provided at the bottom of the cylinder body (11), and the gas outlet (13) is connected to the interior of the flue gas deacidification reaction tower through the expansion joint (5).

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