Household garbage incineration flue gas desulfurization and denitrification integrated treatment process

Abstract

The invention discloses a household garbage incineration flue gas desulfurization and denitrification integrated treatment process, and belongs to the technical field of flue gas desulfurization and denitrification. A lower inner shell and a lower outer shell arranged on the outer side of the lower inner shell in a sleeving mode are included, and the lower end of the lower outer shell is supported through a supporting foot base; one end of the liquid injection port and one end of the liquid discharge port are both connected to the interior of the lower inner shell in a penetrating mode, the other end of the liquid injection port and the other end of the liquid discharge port both penetrate to the exterior of the lower outer shell in a sealed mode, and the upper outer shell is fixedly connected to the upper end of the lower outer shell in a sealed mode. The sealing cover is movably sealed between the upper end of the upper outer shell and the upper end of the upper inner shell, and the filter screen is mounted between the upper outer shell and the upper inner shell. By means of the device, flue gas can make full contact with ammonia water conveniently, the ammonia water is stirred, it is guaranteed that the concentrations of all the parts are the same, the problem of insufficient local desulfurization is avoided, and the flue gas desulfurization efficiency and effect are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas desulfurization and denitrification, and specifically to an integrated treatment process for desulfurization and denitrification of domestic waste incineration flue gas. Background Art

[0002] With the acceleration of the urbanization process and the continuous growth of the domestic waste output, domestic waste incineration power generation, as an efficient resource treatment method, has been widely applied. However, the flue gas generated during the incineration process contains a large amount of pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter. If directly discharged without effective treatment, it will pose a serious threat to the atmospheric environment and human health; The existing method for desulfurization and denitrification of domestic waste incineration flue gas is to absorb sulfides in the flue gas through ammonia water, and then denitrify the flue gas through an SCR catalytic reactor. This method can achieve integrated desulfurization and denitrification of the flue gas, but there are still certain problems, specifically as follows: The existing integrated flue gas desulfurization and denitrification device has a publication number of CN210206451U, which discloses a domestic waste incineration flue gas desulfurization and denitrification device. It sprays ammonia water through a nozzle to make the ammonia water contact the upward flowing flue gas, thereby absorbing sulfides in the flue gas. However, in this spraying method, it is not easy to make the flue gas and ammonia water fully contact, which is not conducive to fully removing sulfides in the flue gas. In addition, in the cooling tower, the ammonia water is prone to standing due to not being used before. In the standing ammonia water, the part with a larger density (usually the part with a lower concentration) will sink, while the part with a smaller density (the part with a higher concentration) will float relatively, resulting in a concentration difference between the upper and lower parts, and further reducing the desulfurization effect of the flue gas; Therefore, an integrated treatment process for desulfurization and denitrification of domestic waste incineration flue gas is needed to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide an integrated treatment process for desulfurization and denitrification of domestic waste incineration flue gas to solve the problem that the existing integrated treatment method for desulfurization and denitrification of domestic waste incineration flue gas cannot make the ammonia water and the flue gas fully contact, which is not conducive to improving the efficiency and effect of flue gas desulfurization as mentioned in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: An integrated process for desulfurization and denitrification of domestic waste incineration flue gas, including a lower inner housing and a lower outer housing sleeved outside the lower inner housing, and the lower end of the lower outer housing is supported by a support footrest. One end of the liquid injection port and the liquid discharge port are both connected to the inside of the lower inner housing in a penetrating manner, and the other ends of the liquid injection port and the liquid discharge port are both hermetically penetrated to the outside of the lower outer housing. The upper outer housing is hermetically and fixedly connected to the upper end of the lower outer housing, and a sealing cover is movably sealed between the upper end of the upper outer housing and the upper end of the upper inner housing. A filter screen is installed between the upper outer housing and the upper inner housing. The exhaust port is arranged at the top of the upper inner housing and penetrates both the inside and outside of the upper inner housing. The SCR catalytic reactor is installed inside the upper inner housing, and the height of the SCR catalytic reactor is higher than the height of the top of the shaft tube.

[0005] Preferably, the lower outer housing and the lower inner housing are fixedly connected by a connecting ring plate, and air guide holes are arranged on the connecting ring plate at equal angles, and the air guide holes penetrate through the upper and lower sides of the connecting ring plate. The height of the connecting ring plate is higher than the height of the liquid injection port and the liquid discharge port.

[0006] Preferably, a microbubble mechanism for improving the desulfurization effect and efficiency is arranged inside the lower outer housing. The microbubble mechanism includes an installation cavity arranged at the lower end of the lower outer housing. The lower end of a shaft rod key-connected to a driven gear is rotatably connected by bearings at equal angles inside the installation cavity, and the upper end of the shaft rod is hermetically penetrated through the bearing into the inside of the lower inner housing. The lower inner housing is communicated with the installation cavity through a one-way air hole. The number of groups of one-way air holes is the same as the number of shaft rods. Each group of the one-way air holes is distributed at equal angles with respect to the corresponding shaft rod, and the one-way air holes are arranged within the projection range of a diffusing impeller. The diffusing impeller is installed at the upper end of the corresponding shaft rod. The driven gears are meshed with the outside of the driving gear at equal angles, and the driving gear is key-connected to the end of the shaft tube penetrating into the installation cavity.

[0007] Preferably, a spray stirring mechanism is arranged inside the lower inner housing. The spray stirring mechanism includes an output pipe communicated with the liquid discharge port. The output pipe is communicated with one end of an input pipe through a pump body. After the other end of the input pipe penetrates through the lower outer housing, it penetrates into the installation cavity and is communicated with the lower end of the shaft tube. Stirring arms are distributed at equal angles at the upper end of the shaft tube, and inclined nozzles are evenly distributed on each stirring arm.

[0008] Preferably, an air inlet hole is arranged on the upper inner housing, and an air inlet hole communicated with the lower outer housing is arranged on the installation cavity for conveying flue gas from the outside to between the upper outer housing and the upper inner housing, and then passing through the air guide hole and the air inlet hole into the installation cavity in sequence, so as to enter the lower inner housing through the one-way air hole subsequently.

[0009] Preferably, both the connection between the shaft tube and the lower inner housing and the connection between the input tube and the shaft tube are sealed by bearings, ensuring that ammonia water will not overflow from the connection between the shaft tube and the lower inner housing or between the input tube and the shaft tube.

[0010] Preferably, the stirring arm is of a hollow structure, and the inclined nozzles provided on the stirring arm are connected to the inside of the shaft tube through the hollow structure inside the stirring arm.

[0011] Preferably, the inclined nozzles are arranged to incline downward, used for spraying the upward moving flue gas. The stirring arm is in a zigzag shape, and the inclined nozzles are arranged on the horizontal section of the stirring arm, and the vertical section of the stirring arm is used for stirring the ammonia water in the lower inner housing.

[0012] An integrated treatment process for desulfurization and denitrification of domestic waste incineration flue gas, the treatment process includes the following steps: S1, Inject ammonia water into the inside of the lower inner housing through the liquid injection port, install the filter screen between the upper outer housing and the upper inner housing, and then cover the sealing cover; S2, Connect the power supply of the pump body. Through the action of the pump body, the ammonia water inside the lower inner housing flows through the drain port, output pipe, pump body and input pipe in sequence, and then is injected into the shaft tube; S3, Inject the flue gas into the space between the upper outer housing and the upper inner housing through the air inlet hole, and filter the flue gas through the filter screen between them; S4, After being filtered, the flue gas passes through the air guide hole, lower inner housing, air inlet hole, installation cavity and one-way air hole in sequence, and then enters the inside of the lower inner housing; S5, The flue gas entering the inside of the lower inner housing passes through the ammonia water, is absorbed and sulfided, and then is denitrified by the SCR catalytic reactor above. Subsequently, it is discharged from the exhaust port.

[0013] Preferably, the desulfurization process in S5 specifically includes: S5.1, After the ammonia water enters the shaft tube and flows out from the inclined nozzles through the stirring arm, it drives the shaft tube to rotate. Through the meshing of the driving gear and the driven gear, the shaft tube drives the air diffusing impeller to rotate at a high speed, thereby cutting the bubbles formed when entering the lower inner housing from the one-way air hole, turning the large bubbles formed by the flue gas into dense small bubbles, thus increasing the surface area of contact between the flue gas and the ammonia water, improving the reaction efficiency and effect. In addition, when the inclined nozzles spray ammonia water to drive the shaft tube to rotate, the stirring arm will be driven to rotate. The rotation of the stirring arm can stir the ammonia water in the lower inner housing, ensuring that the ammonia water concentration at each position in the lower inner housing is consistent; S5.2, The ammonia water sprayed by the inclined nozzles further contacts and reacts with the flue gas overflowing from the surface of the ammonia water in the lower inner housing, ensuring thorough desulfurization.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The integrated process for desulfurization and denitrification of domestic waste incineration flue gas not only facilitates the full contact of the flue gas with ammonia water, but also stirs the ammonia water to ensure that the concentration of each part is the same, avoiding the problem of incomplete desulfurization in some parts, and helping to improve the efficiency and effect of flue gas desulfurization: 1. Through the microbubble mechanism, it is convenient to cut the large bubbles formed after the flue gas enters the ammonia water into a large number of tiny bubbles, which helps to increase the surface area of contact between the flue gas and the ammonia water, and then helps the ammonia water to fully absorb the sulfides in the flue gas. Subsequently, the flue gas overflowing from the surface of the ammonia water will be sprayed by the ammonia water ejected from the inclined nozzle, which helps to further ensure the thorough removal of sulfides in the flue gas, thus helping to improve the efficiency and effect of flue gas desulfurization; 2. During the process of the inclined nozzle ejecting ammonia water, it will not only drive the gas-dispersing impeller in the microbubble mechanism to rotate at a high speed, but also make the stirring arm rotate, which helps to stir the ammonia water in the lower inner shell to ensure that the concentration of ammonia water in each part is consistent, avoiding the phenomenon of incomplete desulfurization of local flue gas, and further helping to ensure the efficiency and effect of desulfurization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view structural schematic diagram of the present invention; Figure 2 is the front sectional view structural schematic diagram of the present invention; Figure 3 is of the present invention Figure 2 the enlarged structural schematic diagram of point A therein; Figure 4 is the rear view structural schematic diagram of the present invention; Figure 5 is the side sectional view structural schematic diagram of the present invention; Figure 6 is of the present invention Figure 5 the enlarged structural schematic diagram of point B therein; Figure 7 is the front view structural schematic diagram of the position of the upper inner shell and the filter screen of the present invention; Figure 8 is the top view structural schematic diagram of the position of the upper inner shell and the filter screen of the present invention; Figure 9 is the connection structural schematic diagram of the lower outer shell and the lower inner shell of the present invention.

[0016] In the figure: 1. Lower outer casing; 2. Support footrest; 3. Upper outer casing; 4. Upper inner casing; 5. Sealing cover; 6. Exhaust port; 7. Air inlet hole; 8. Liquid injection port; 9. Input pipe; 10. Output pipe; 11. Pump body; 12. Lower inner casing; 13. Installation cavity; 14. Filter screen; 15. Shaft tube; 16. Stirring arm; 17. SCR catalytic reactor; 18. Driving gear; 19. Driven gear; 20. Liquid discharge port; 21. One-way air hole; 22. Air-dispersing impeller; 23. Air guiding hole; 24. Air inlet hole; 25. Connecting ring plate; 26. Oblique nozzle. Detailed implementation manner

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1 - 9 , the present invention provides the following technical solutions: Embodiment 1: To solve the problem that the conventional integrated treatment process for desulfurization and denitrification of domestic waste incineration flue gas cannot ensure sufficient contact between the flue gas and ammonia water, the following technical solutions are provided. Specifically, a lower outer casing 1 is sleeved outside the lower inner casing 12, and the lower end of the lower outer casing 1 is supported by a support footrest 2. One ends of the liquid injection port 8 and the liquid discharge port 20 are both connected to the inside of the lower inner casing 12 in a penetrating manner, and the other ends of the liquid injection port 8 and the liquid discharge port 20 are both hermetically penetrated to the outside of the lower outer casing 1. The upper outer casing 3 is hermetically and fixedly connected to the upper end of the lower outer casing 1, and the sealing cover 5 is movably sealed between the upper end of the upper outer casing 3 and the upper end of the upper inner casing 4. The filter screen 14 is installed between the upper outer casing 3 and the upper inner casing 4. The exhaust port 6 is arranged at the top end of the upper inner casing 4, and the exhaust port 6 penetrates both the inside and outside of the upper inner casing 4. The SCR catalytic reactor 17 is installed inside the upper inner casing 4, and the height of the SCR catalytic reactor 17 is higher than the height of the top end of the shaft tube 15.

[0019] The lower outer shell 1 and the lower inner shell 12 are fixedly connected through a connecting ring plate 25, and the air guide holes 23 are arranged at equal angles on the connecting ring plate 25. The air guide holes 23 penetrate through the upper and lower sides of the connecting ring plate 25. The height of the connecting ring plate 25 is higher than the heights of the liquid injection port 8 and the liquid discharge port 20. A microbubble mechanism for improving the desulfurization effect and efficiency is arranged in the lower outer shell 1. The microbubble mechanism includes an installation cavity 13 arranged at the lower end of the lower outer shell 1. The lower ends of the shaft rods key-connected to the driven gears 19 are rotatably connected by bearings at equal angles in the installation cavity 13, and the upper ends of the shaft rods penetrate into the interior of the lower inner shell 12 through sealed bearings. The lower inner shell 12 is communicated with the installation cavity 13 through one-way air holes 21. The number of groups of the one-way air holes 21 is the same as the number of the shaft rods. Each group of the one-way air holes 21 is distributed at equal angles with respect to the corresponding shaft rod, and the one-way air holes 21 are arranged within the projection range of the air-dispersing impeller 22. The air-dispersing impeller 22 is installed at the upper end of the corresponding shaft rod. The driven gears 19 are meshed with the outer side of the driving gear 18 at equal angles, and the driving gear 18 is key-connected to the end of the shaft tube 15 penetrating into the installation cavity 13. During use, the flue gas is introduced between the upper outer shell 3 and the upper inner shell 4 through the air inlet hole 7. After that, the flue gas passes through the filter screen 14 and then enters between the lower outer shell 1 and the lower inner shell 12 through the air guide holes 23, and then enters the installation cavity 13 through the air inlet holes 24. Due to the air pressure, the flue gas in the installation cavity 13 can enter the lower inner shell 12 through the one-way air holes 21. At the same time as the above process, the pump body 11 transports the ammonia water in the lower inner shell 12 into the shaft tube 15, and the ammonia water entering the shaft tube 15 is sprayed out from the inclined nozzle 26 after passing through the stirring arm 16. The ammonia water sprayed out from the inclined nozzle 26 will push the shaft tube 15 and the stirring arm 16 to rotate, and then the driving gear 18 can drive the driven gear 19 to rotate, so that the air-dispersing impeller 22 rotates at a high speed. When the air-dispersing impeller 22 rotates at a high speed, it will cut the large air bubbles formed by the flue gas entering the lower inner shell 12 through the one-way air holes 21, so that the large air bubbles are cut into dense small air bubbles, thereby increasing the surface area in contact with the ammonia water, which helps the ammonia water and the flue gas to be in full contact, and thus helps to improve the desulfurization efficiency and effect. In addition, the ammonia water sprayed out from the inclined nozzle 26 will also contact the flue gas overflowing from the surface of the ammonia water in the lower inner shell 12, which is beneficial to ensuring the thoroughness of desulfurization.

[0020] Embodiment 2: To solve the problem that the conventional integrated process for desulfurization and denitrification of domestic waste incineration flue gas cannot stir ammonia water, which easily leads to uneven concentration, the following technical solution is provided. Specifically, a spray stirring mechanism is arranged inside the lower inner shell 12. The spray stirring mechanism includes an output pipe 10 that is connected in a through manner to the liquid discharge port 20. The output pipe 10 is connected in a through manner to one end of an input pipe 9 through a pump body 11. The other end of the input pipe 9 penetrates through the lower outer shell 1 and then penetrates into the installation cavity 13 and is connected in a through manner to the lower end of a shaft pipe 15. Stirring arms 16 are evenly distributed at equal angles at the upper end of the shaft pipe 15, and inclined nozzles 26 are evenly spaced on each stirring arm 16.

[0021] An air inlet hole 7 is arranged on the upper inner shell 4. An air inlet hole 24 that is connected to the lower outer shell 1 in a through manner is arranged on the installation cavity 13, which is used to transport flue gas from the outside to between the upper outer shell 3 and the upper inner shell 4, and then sequentially enter the installation cavity 13 through a guide air hole 23 and the air inlet hole 24, so as to enter the lower inner shell 12 through a one-way air hole 21 subsequently. Both between the shaft pipe 15 and the lower inner shell 12 and between the input pipe 9 and the shaft pipe 15 are connected in a bearing-sealed manner to ensure that ammonia water does not overflow from the connection between the shaft pipe 15 and the lower inner shell 12 or between the input pipe 9 and the shaft pipe 15. The stirring arm 16 is a hollow structure, and the inclined nozzles 26 arranged on the stirring arm 16 are connected in a through manner to the inside of the shaft pipe 15 through the hollow structure inside the stirring arm 16. The inclined nozzles 26 are arranged in an inclined downward manner and are used to spray the upward-moving flue gas. The stirring arm 16 is in a zigzag shape, and the inclined nozzles 26 are arranged on the horizontal section of the stirring arm 16. The vertical section of the stirring arm 16 is used to stir the ammonia water inside the lower inner shell 12. During use, since the shaft pipe 15 and the stirring arms 16 rotate synchronously, the stirring arms 16 can stir the ammonia water inside the lower inner shell 12, avoiding uneven concentration inside the ammonia water due to density or other reasons, and further ensuring that sulfides in the flue gas at each part are fully removed, which is beneficial to further improving the efficiency and effect of flue gas desulfurization.

[0022] An integrated process for desulfurization and denitrification of domestic waste incineration flue gas, the treatment process includes the following steps: S1, inject ammonia water into the inside of the lower inner shell 12 through the liquid injection port 8, install the filter screen 14 between the upper outer shell 3 and the upper inner shell 4, and then cover the sealing cover 5; S2, turn on the power supply of the pump body 11. Through the action of the pump body 11, the ammonia water inside the lower inner shell 12 flows through the liquid discharge port 20, the output pipe 10, the pump body 11, and the input pipe 9 in sequence, and then is injected into the shaft pipe 15; S3, inject flue gas into the space between the upper outer shell 3 and the upper inner shell 4 through the air inlet hole 7, and filter the flue gas through the filter screen 14 between the two; S4. After the flue gas is filtered, it successively passes through the air guide holes 23, the lower inner housing 12, the air inlet holes 24, the installation cavity 13, and the one-way air holes 21, and then enters the interior of the lower inner housing 12; S5. The flue gas that enters the interior of the lower inner housing 12 passes through ammonia water, is absorbed and sulfided, and then passes through the SCR catalytic reactor 17 above for denitrification, and then is discharged from the exhaust port 6.

[0023] The specific desulfurization process in S5 includes: S5.1. After the ammonia water enters the shaft tube 15 and flows through the stirring arm 16 and sprays out from the inclined nozzle 26, it drives the shaft tube 15 to rotate. Through the meshing of the driving gear 18 and the driven gear 19, the shaft tube 15 drives the air-dispersing impeller 22 to rotate at a high speed, thereby cutting the bubbles formed when entering the lower inner housing 12 from the one-way air holes 21, turning the large bubbles formed by the flue gas into dense small bubbles, thereby increasing the surface area of contact between the flue gas and the ammonia water, improving the reaction efficiency and effect. In addition, when the inclined nozzle 26 sprays out ammonia water and drives the shaft tube 15 to rotate, it will drive the stirring arm 16 to rotate. The rotation of the stirring arm 16 can stir the ammonia water in the lower inner housing 12 to ensure that the ammonia water concentration at each position in the lower inner housing 12 is consistent; S5.2. The ammonia water sprayed out by the inclined nozzle 26 further contacts and reacts with the flue gas overflowing from the surface of the ammonia water in the lower inner housing 12 to ensure thorough desulfurization.

[0024] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0025] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated process for desulfurization and denitrification of flue gas from municipal solid waste incineration, characterized in that: The treatment process includes the following steps: S1. Inject ammonia water into the interior of the lower inner shell (12) through the liquid injection port (8), install the filter screen (14) between the upper outer shell (3) and the upper inner shell (4), and then cover the sealing cover (5); S2. Connect the power supply of the pump body (11). Under the action of the pump body (11), the ammonia water inside the lower inner shell (12) flows through the drain port (20), the output pipe (10), the pump body (11) and the input pipe (9) in sequence, and then is injected into the shaft pipe (15); S3. Inject flue gas into the space between the upper outer shell (3) and the upper inner shell (4) through the air inlet hole (7), and filter the flue gas through the filter screen (14) between them; S4. After being filtered, the flue gas passes through the air guide hole (23), the lower inner shell (12), the air inlet hole (24), the installation cavity (13) and the one-way air hole (21) in sequence, and then enters the interior of the lower inner shell (12); S5. The flue gas entering the interior of the lower inner shell (12) passes through the ammonia water, is absorbed and sulfured, and then is denitrified by the SCR catalytic reactor (17) above. Subsequently, it is discharged from the exhaust port (6).

2. The integrated process for desulfurization and denitrification of domestic waste incineration flue gas according to claim 1, wherein: The specific desulfurization process in S5 includes: S5.

1. After the ammonia water enters the shaft pipe (15) and flows through the stirring arm (16) and sprays out from the inclined nozzle (26), it drives the shaft pipe (15) to rotate. Through the meshing of the driving gear (18) and the driven gear (19), the shaft pipe (15) drives the air-dispersing impeller (22) to rotate at a high speed, so as to cut the bubbles formed when entering the lower inner shell (12) from the one-way air hole (21), making the large bubbles formed by the flue gas become dense small bubbles, thereby increasing the surface area of contact between the flue gas and the ammonia water, improving the reaction efficiency and effect. In addition, when the inclined nozzle (26) sprays ammonia water to drive the shaft pipe (15) to rotate, it will drive the stirring arm (16) to rotate. The rotation of the stirring arm (16) can stir the ammonia water in the lower inner shell (12) to ensure that the ammonia water concentration at each position in the lower inner shell (12) is consistent; S5.

2. The ammonia water sprayed out from the inclined nozzle (26) further contacts and reacts with the flue gas overflowing from the surface of the ammonia water in the lower inner shell (12) to ensure thorough desulfurization.

3. The integrated process for desulfurization and denitrification of domestic waste incineration flue gas according to claim 2, characterized in that: The outer side of the lower inner housing (12) is sleeved with a lower outer housing (1), and the lower end of the lower outer housing (1) is supported by a support footrest (2). One end of each of the liquid injection port (8) and the liquid discharge port (20) is connected through to the inside of the lower inner housing (12), and the other end of each of the liquid injection port (8) and the liquid discharge port (20) is hermetically penetrated to the outside of the lower outer housing (1). The upper outer housing (3) is hermetically and fixedly connected to the upper end of the lower outer housing (1), and a sealing cover (5) is movably sealed between the upper end of the upper outer housing (3) and the upper end of the upper inner housing (4). A filter screen (14) is installed between the upper outer housing (3) and the upper inner housing (4). The exhaust port (6) is provided at the top end of the upper inner housing (4), and the exhaust port (6) penetrates through the inner and outer sides of the upper inner housing (4). The SCR catalytic reactor (17) is installed inside the upper inner housing (4), and the height of the SCR catalytic reactor (17) is higher than the height of the top end of the shaft tube (15).

4. A process for integrated desulfurization and denitrification of domestic waste incineration flue gas according to claim 3, characterized in that: The lower outer housing (1) and the lower inner housing (12) are fixedly connected through a connecting ring plate (25), and air guide holes (23) are arranged at equal angles on the connecting ring plate (25). The air guide holes (23) penetrate through the upper and lower sides of the connecting ring plate (25). The height of the connecting ring plate (25) is higher than the heights of the liquid injection port (8) and the liquid discharge port (20).

5. A process for integrated desulfurization and denitrification of domestic waste incineration flue gas according to claim 4, characterized in that: A microbubble mechanism for improving the desulfurization effect and efficiency is arranged inside the lower outer housing (1). The microbubble mechanism includes an installation cavity (13) arranged at the lower end of the lower outer housing (1). The lower end of a shaft rod key-connected to a driven gear (19) is rotatably connected through bearings at equal angles inside the installation cavity (13), and the upper end of the shaft rod is hermetically penetrated through the bearing to the inside of the lower inner housing (12). The lower inner housing (12) is connected through to the installation cavity (13) through one-way air holes (21). The number of groups of the one-way air holes (21) is the same as the number of the shaft rods. Each group of the one-way air holes (21) is distributed at equal angles with respect to the corresponding shaft rod, and the one-way air holes (21) are arranged within the projection range of a gas-dispersing impeller (22). The gas-dispersing impeller (22) is installed at the upper end of the corresponding shaft rod. The driven gear (19) is meshed and connected to the outer side of a driving gear (18) at equal angles, and the driving gear (18) is key-connected to the end of the shaft tube (15) penetrating into the installation cavity (13).

6. The integrated process for desulfurization and denitrification of domestic waste incineration flue gas according to claim 5, characterized in that: A spray stirring mechanism is arranged inside the lower inner housing (12). The spray stirring mechanism includes an output pipe (10) connected through to the liquid discharge port (20). The output pipe (10) is connected through to one end of an input pipe (9) through a pump body (11). After the other end of the input pipe (9) penetrates through the lower outer housing (1), it penetrates and extends into the installation cavity (13) and is connected through to the lower end of the shaft tube (15). Stirring arms (16) are distributed at equal angles at the upper end of the shaft tube (15), and inclined nozzles (26) are evenly distributed at equal intervals on each of the stirring arms (16).

7. An integrated process for desulfurization and denitrification of domestic waste incineration flue gas according to claim 6, characterized in that: The intake hole (7) is arranged on the upper inner housing (4), and an air inlet hole (24) communicating with the lower outer housing (1) is arranged on the installation cavity (13) for conveying flue gas from the outside to the space between the upper outer housing (3) and the upper inner housing (4), and then passing through the air guiding hole (23) and the air inlet hole (24) in sequence to enter the installation cavity (13), so as to enter the lower inner housing (12) through the one-way air hole (21) subsequently.

8. A process for integrated desulfurization and denitrification of domestic waste incineration flue gas according to claim 7, characterized in that: A bearing seal connection is provided between the shaft tube (15) and the lower inner housing (12) and between the input tube (9) and the shaft tube (15) to ensure that ammonia water does not overflow from the connection between the shaft tube (15) and the lower inner housing (12) or between the input tube (9) and the shaft tube (15).

9. The integrated process for desulfurization and denitrification of domestic waste incineration flue gas according to claim 8, characterized in that: The stirring arm (16) is of a hollow structure, and the inclined nozzle (26) arranged on the stirring arm (16) is connected in through connection with the inside of the shaft tube (15) through the hollow structure inside the stirring arm (16).

10. A process for integrated desulfurization and denitrification of domestic waste incineration flue gas according to claim 9, characterized in that: The inclined nozzle (26) is arranged to incline downward for spraying the upward moving flue gas. The stirring arm (16) is of a broken line shape, the inclined nozzle (26) is arranged on the horizontal section of the stirring arm (16), and the vertical section of the stirring arm (16) is used for stirring the ammonia water in the lower inner housing (12).

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