An air intake distributor and a flue gas purification system

Abstract

The present invention provides an air intake distributor and a flue gas purification system, the air intake distributor comprising: a shell, an exhaust duct arranged at the bottom of the shell and extending away from the bottom of the shell, a swirl plate arranged in the exhaust duct, and an injection duct penetrating the shell from the top of the shell and extending into the exhaust duct, the injection duct passing through the swirl plate; a flue surrounding the injection duct and a plurality of exhaust ports uniformly surrounding the injection duct are arranged in the shell, the exhaust ports are connected to the flue and are located in the exhaust duct. The air intake distributor of the present invention promotes uniform distribution of smoke in the flue, and then distributes the smoke uniformly to the exhaust duct through a plurality of exhaust ports, and fully mixes with the atomized slurry coming out of the injection duct after passing through the swirl plate, so as to ensure the stable operation of the atomizer equipment.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas purification, and in particular to an air intake distributor and a flue gas purification system. Background Art

[0002] In waste incineration power plants, the flue gas purification system usually adopts the rotary spray semi-dry method. The desulfurizer mainly uses lime slurry. The lime slurry is atomized into 30-60um droplets through a rotary atomizer and enters the deacidification tower to react with pollutants such as sulfides and hydrides in the flue gas.

[0003] In the existing air inlet distributor, after the flue gas enters the air inlet distributor, it flows downward through a guide plate and then reacts with the atomized slurry sprayed by the atomizer, thereby removing pollutants such as sulfur dioxide and hydrogen chloride. However, the flue gas is not uniform after leaving the air inlet distributor, and the mixing effect with the atomized slurry is poor. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art and to provide an air intake distributor and a flue gas purification system.

[0005] One embodiment of the present invention provides an intake air distributor, comprising: a housing, an exhaust duct disposed at the bottom of the housing and extending away from the bottom of the housing, a swirl plate disposed in the exhaust duct, and an injection duct penetrating the housing from the top of the housing and extending into the exhaust duct, the injection duct passing through the swirl plate;

[0006] The shell is provided with a flue surrounding the injection pipe and a plurality of exhaust ports evenly surrounding the injection pipe. The exhaust ports are communicated with the flue and are located in the exhaust pipe.

[0007] Compared with the prior art, the air intake distributor of the present invention promotes uniform distribution of smoke in the flue and then distributes it evenly to the exhaust pipe through multiple exhaust ports. After passing through the swirl plate, it is fully mixed with the atomized slurry coming out of the injection pipe to ensure stable operation of the atomizer equipment.

[0008] Furthermore, the cross section of the flue gradually decreases from the head end of the flue to the tail end of the flue.

[0009] Furthermore, the tail end of the flue surrounds the injection pipe and is connected with the head end of the flue.

[0010] Furthermore, the swirl plate includes a plurality of swirl blades arranged around the injection pipe, and projections of adjacent swirl blades in the extension direction of the exhaust pipe partially overlap.

[0011] Furthermore, a guide plate parallel to the extension direction of the exhaust duct is provided on the top of the swirl blade.

[0012] Furthermore, the exhaust duct is formed with a diameter reducing portion located between the swirl plate and the port of the exhaust duct, and the inner diameter of the diameter reducing portion gradually decreases from the swirl plate to the outlet of the exhaust duct.

[0013] Furthermore, a flow partitioning pipe is provided in the exhaust duct and is located between the swirl plate and the port of the exhaust duct. The flow partitioning pipe is connected to the injection pipe, and its inner diameter gradually decreases from the swirl plate to the outlet of the exhaust duct, and its outer wall and the inner wall of the reducing portion form a channel connected to the swirl plate.

[0014] Furthermore, a guide channel connected to the exhaust port is provided in the flue, and the guide channel extends along an axis rotating from a radial direction parallel to the exhaust pipe to an extension direction parallel to the exhaust pipe, and a channel opening of the guide channel is inclined away from the direction of smoke flow in the flue.

[0015] Furthermore, the guide channel is provided with two first side panels and a second side panel connecting the tops and sides of the two first side panels, the first side panels and the second side panels are arranged around the exhaust port, and the inner side of the second side panel has a guide curved surface extending along the guide channel.

[0016] Another embodiment of the present invention provides a flue gas purification system, comprising: a conveying pipeline, a fan and a desulfurization tower connected to the conveying pipeline, an atomizer and an air intake distributor as described above, the atomizer extends into the injection pipeline, and the flue and the exhaust pipeline are both connected to the conveying pipeline.

[0017] In order to more clearly understand the present invention, the specific implementation of the present invention will be described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of one side of an air intake distributor according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional view of the other side of the air intake distributor is shown;

[0020] Figure 3 for Figure 1 A top cutaway view of the air intake distributor is shown;

[0021] Figure 4 A schematic diagram of the structure of a swirl plate according to an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of a partial structure of an exhaust duct according to an embodiment of the present invention;

[0023] Figure 6 The figure is a schematic structural diagram of a flow guide channel according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of one side of an air intake distributor according to an embodiment of the present invention. Figure 2 yes Figure 1 The sectional view of the other side of the air intake distributor shown in the figure comprises: a shell 10, an exhaust duct 20 arranged at the bottom of the shell 10 and extending away from the bottom of the shell 10, a swirl plate 30 arranged in the exhaust duct 20, and an injection duct 40 that penetrates the shell 10 from the top of the shell 10 and extends into the exhaust duct 20, and the injection duct 40 passes through the swirl plate 30.

[0026] See also Figure 3 , which is Figure 1 The top cross-sectional view of the air inlet distributor is shown in the arrow direction. The housing 10 is provided with a flue 11 surrounding the injection pipe and a plurality of exhaust ports 12 uniformly surrounding the injection pipe. The exhaust ports 12 are connected to the flue 11 and are located in the exhaust pipe 20. The exhaust ports 12 uniformly distribute the flue gas flow, so that the flue gas under various flow rate states can be relatively evenly distributed and then enter the exhaust pipe 20.

[0027] In some optional embodiments, the cross-section of the flue 11 gradually decreases in the direction from the upstream end of the flue 11 to the downstream end of the flue 11, and the cross-section of the flue 11 decreases as the amount of air flowing through it decreases, thereby ensuring that the dynamic pressure of the flue gas at each exhaust port 12 is consistent, so that the flue gas can obtain a relatively balanced distribution and a stable flow state after entering the exhaust duct 20 under various flow rate conditions. In this embodiment, the flue 11 is volute-shaped as a whole. Of course, the flue 11 can also be gradually narrowed in other different forms. Preferably, the downstream end of the flue 11 surrounds the injection pipe and is connected to the upstream end of the flue 11 to ensure an annular distribution of the flue gas flow, making the flue gas more stable and uniform. It should be noted that the smoke inlet direction of the flue 11 is parallel to the extension direction of the flue 11 at the upstream end, so as to facilitate the formation of an annular flue gas flow distribution. In this embodiment, the shell 10 further includes a smoke inlet pipe 13, which is connected to the upstream end of the flue 11 and has an extension direction parallel to the extension direction of the upstream end of the flue 11 to prevent the smoke inlet pipe 13 from transporting smoke toward the downstream end.

[0028] See also Figure 4 , which is a schematic diagram of the structure of a swirl plate of an embodiment of the present invention. In some optional embodiments, the swirl plate 30 includes a plurality of swirl blades 31 arranged around the injection pipe, and the projections of adjacent swirl blades 31 in the extension direction of the exhaust pipe 20 overlap. The flue gas flow pattern is further improved, and even distribution of the flue gas can still be achieved in the case of large fluctuations in the flue gas volume, so that the operation of the entire flue gas purification system is more stable.

[0029] See also Figure 5 , which is a partial structural diagram of an exhaust duct according to an embodiment of the present invention. In some optional embodiments, a guide plate 32 parallel to the extension direction of the exhaust duct 20 is provided on the top of the swirl blade 31. The guide plate 32 serves to further stabilize the flow state of the flue gas before the flue gas contacts the swirl blade 31. In some optional embodiments, the windward side and the leeward side of the swirl blade 31 are parallel. Further, the angle between the windward side of the swirl blade 31 and the extension direction of the exhaust duct 20 is 20° to 40°, such as 30°.

[0030] In some optional embodiments, the exhaust duct 20 is formed with a reducer 21 located between the swirl plate 30 and the port of the exhaust duct 20, and the inner diameter of the reducer 21 gradually decreases from the swirl plate 30 to the outlet of the exhaust duct 20. The reducer 21 can gather the flue gas flow, ensure the flow rate of the flue gas flow leaving the air inlet distributor, and avoid the problem of insufficient flue gas flow rate when the flue gas leaves the air inlet distributor and enters the deacidification tower. Preferably, the reducer 21 extends to one side of the swirl blade 31, and performs preliminary gathering when the flue gas swirls, so that the flow state of the flue gas is more in line with the requirements.

[0031] In some optional embodiments, a flow partitioning pipe 22 is provided in the exhaust pipe 20 between the swirl plate 30 and the port of the exhaust pipe 20. The flow partitioning pipe 22 is connected to the injection pipe, and its inner diameter gradually decreases from the swirl plate 30 to the outlet of the exhaust pipe 20, and its outer wall and the inner wall of the diameter reducing portion 21 form a channel connected to the swirl plate 30. The flow partitioning pipe 22 prevents the flue gas flow from generating a large turbulence in the injection pipe, and prevents the flue gas flow from impacting the atomizer 50 in the injection pipe.

[0032] See also Figure 3 , which is Figure 1 The top cross-sectional view of the air inlet distributor is shown in the figure. The arrow direction shown in the figure is the direction of the channel opening of the guide channel. In some optional embodiments, the flue 11 is provided with a guide channel 14 connected to the exhaust port 12. The guide channel 14 extends along an axis that rotates from a radial direction parallel to the exhaust pipe 20 to an axis that is parallel to the extension direction of the exhaust pipe 20. The channel opening of the guide channel 14 is inclined away from the direction of the smoke flow in the flue 11, that is, facing the smoke, so that the smoke is more easily introduced into the guide channel 14, and the guide channel 14 stably guides the smoke to the extension direction of the exhaust pipe 20. Please refer to Figure 6 , which is a schematic diagram of the structure of a guide channel of an embodiment of the present invention. It should be noted that the form of the guide channel 14 can be appropriately designed according to actual needs. The purpose is to change the flow direction of the flue gas. For example, in some optional embodiments, the guide channel 14 is provided with two first side panels 15 and a second side panel 16 connecting the tops and sides of the two first side panels 15. The first side panels 15 and the second side panels 16 are arranged around the exhaust port 12, and the inner side of the second side panel 16 has a guide curved surface extending along the guide channel 14.

[0033] Compared with the prior art, the air intake distributor of the present invention promotes uniform distribution of smoke in the flue and then distributes it evenly to the exhaust pipe through multiple exhaust ports. After passing through the swirl plate, it is fully mixed with the atomized slurry coming out of the injection pipe to ensure stable operation of the atomizer equipment.

[0034] The air intake distributor described above can be used in a flue gas purification system, which includes: a conveying pipe, a fan and a desulfurization tower connected to the conveying pipe, an atomizer 50 and the air intake distributor described above, the atomizer 50 extends into the injection pipe, and the flue 11 and the exhaust pipe 20 are both connected to the conveying pipe.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air intake distributor, characterized in that: include: A shell, an exhaust duct arranged at the bottom of the shell and extending away from the bottom of the shell, a swirl plate arranged in the exhaust duct, and an injection duct penetrating the shell from the top of the shell and extending into the exhaust duct, wherein the injection duct passes through the swirl plate; The shell is provided with a flue surrounding the injection pipe and a plurality of exhaust ports uniformly surrounding the injection pipe, the exhaust ports are communicated with the flue and are located in the exhaust pipe, and the flue is in a volute shape; The swirl plate includes a plurality of swirl blades arranged around the injection pipe, and projections of adjacent swirl blades in an extending direction of the exhaust pipe partially overlap.

2. An air intake distributor according to claim 1, characterized in that: The cross-section of the flue gradually decreases in a direction from the upstream end of the flue to the downstream end of the flue.

3. An air intake distributor according to claim 2, characterized in that: The downstream end of the flue surrounds the injection pipe and is communicated with the upstream end of the flue.

4. An air intake distributor according to claim 1, characterized in that: A guide plate parallel to the extension direction of the exhaust duct is arranged on the top of the swirl blade.

5. An air intake distributor according to claim 1, characterized in that: The exhaust duct is formed with a diameter reducing portion located between the swirl plate and the port of the exhaust duct, and the inner diameter of the diameter reducing portion gradually decreases from the swirl plate to the outlet of the exhaust duct.

6. An air intake distributor according to claim 5, characterized in that: A flow partition pipe is provided in the exhaust pipe and is located between the swirl plate and the port of the exhaust pipe. The flow partition pipe is connected to the injection pipe, and its inner diameter gradually decreases from the swirl plate to the outlet of the exhaust pipe. Its outer wall and the inner wall of the reducing portion form a channel connected to the swirl plate.

7. An air intake distributor according to claim 1, characterized in that: A guide channel connected to the exhaust port is arranged in the flue, and the guide channel extends along an axis rotating from a radial direction parallel to the exhaust pipe to an extension direction parallel to the exhaust pipe, and a channel opening of the guide channel is inclined away from the direction of smoke flow in the flue.

8. An air intake distributor according to claim 7, characterized in that: include: The guide channel is provided with two first side plates and a second side plate connecting the tops and sides of the two first side plates. The first side plates and the second side plates are arranged around the exhaust port. The inner side of the second side plate has a guide curved surface extending along the guide channel.

9. A flue gas purification system, characterized in that: A conveying pipeline, a fan and a desulfurization tower connected to the conveying pipeline, an atomizer, and an air intake distributor as described in any one of claims 1 to 8, wherein the atomizer extends into the injection pipeline, and the flue and the exhaust pipeline are both connected to the conveying pipeline.

Images