Flue gas desulfurization, denitrification, dust removal and purification system and purification method

Abstract

The invention relates to the technical field of flue gas purification, and provides a flue gas desulfurization, denitrification, dust removal and purification system and method.The flue gas desulfurization, denitrification, dust removal and purification system comprises a catalytic reaction bin, a quick replacement mechanism, a cooling bin and a heat exchange dust removal mechanism, the multiple quick replacement mechanisms are arranged on the catalytic reaction bin, multiple catalyst blocks are arranged on the quick replacement mechanisms, the quick replacement mechanisms are used for conveniently replacing the catalyst blocks, the cooling bin is arranged on a gas outlet of the denitration device, and the upper portion of the cooling bin is connected with the catalytic reaction bin; the heat exchange and dust removal mechanism is arranged in the cooling bin and used for cooling the flue gas passing through the catalytic reaction bin and preventing dust accumulation, and by means of the technical scheme, the problem that dust may be accumulated in denitration equipment in the denitration, desulfurization, dust removal and purification process of the flue gas in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas purification, and in particular to a flue gas desulfurization, denitrification and dust removal purification system and a purification method. Background Art

[0002] In many industrial production processes, flue gas containing sulfur and nitrogen is produced. For example, when refining crude oil, petrochemical enterprises produce sulfur hydrogen, nitrogen hydrogen, sulfur oxide, and nitrogen oxide. In thermal power plants and industrial boilers that burn coal, oil or other fuels, the flue gas contains a large amount of sulfur oxide and nitrogen oxide. In the cement production process, the flue gas contains harmful gases such as sulfate and nitrogen oxide. The coking industry is an important part of the coal chemical industry. The sulfur dioxide and nitrogen oxides in the coke oven flue gas produced by coke oven heating are important sources of sulfur dioxide and nitrogen oxides in coking production. When these industries are in production, sulfur oxides and nitrogen oxides are one of the main sources of air pollution. They will cause the formation of acid rain, photochemical smog and fine particulate matter (PM2.5), posing a serious threat to the environment and human health. Through desulfurization, denitrification and dust removal technology, these harmful gases can be converted into harmless or low-toxic substances, thereby achieving the purpose of purifying flue gas.

[0003] The flue gas purification method commonly used now is to pass the flue gas through denitrification, dust removal and desulfurization equipment in sequence. The main denitrification method is to use catalytic reduction to reduce nitrogen oxides to nitrogen and water through a catalyst. Since denitrification requires the flue gas to have a certain temperature, in order to save energy consumption for adjusting the temperature of the flue gas, the flue gas is preferentially denitrified. After denitrification, the flue gas temperature is reduced to the temperature entering the dust collector through a heat exchanger, and then through dry electrostatic dust removal and wet desulfurization. After desulfurization, a wet dust removal equipment can be set up to perform dust removal again to improve the flue gas purification efficiency. Since the flue gas enters the denitrification equipment first before dust removal, and the flue gas will produce water in the denitrification equipment, the dust in the flue gas may adhere to the catalyst and the heat exchanger. When there is a lot of dust attached, the heat exchanger needs to be cleaned and the catalyst replaced, which undoubtedly requires stopping the flue gas treatment process, which has a great impact on the efficiency of industrial production. Summary of the invention

[0004] The present invention provides a flue gas desulfurization, denitrification, dust removal and purification system and purification method, which solves the problem in the related art that dust may accumulate in the denitrification equipment during the flue gas denitrification, desulfurization, dust removal and purification process.

[0005] The technical solution of the present invention is as follows: A flue gas desulfurization, denitrification and dust removal purification system comprises a denitrification device, a dry electrostatic precipitator and a desulfurization device, wherein the air outlet of the denitrification device is connected to the air inlet of the dry electrostatic precipitator, and the air outlet of the dry electrostatic precipitator is connected to the air inlet of the desulfurization device. The system also comprises a catalytic reaction bin, a quick replacement mechanism, a cooling bin and a heat exchange and dust removal mechanism. The catalytic reaction bin is fixedly arranged in the denitrification device, and a plurality of quick replacement mechanisms are provided, and a plurality of the quick replacement mechanisms are arranged on the catalytic reaction bin. A plurality of catalyst blocks are arranged on the quick replacement mechanism, and the quick replacement mechanism is used for conveniently replacing the catalyst blocks. The cooling bin is arranged on the air outlet of the denitrification device, and the upper part of the cooling bin is connected to the catalytic reaction bin. The heat exchange and dust removal mechanism is arranged in the cooling bin, and the heat exchange and dust removal mechanism is used for cooling the flue gas passing through the catalytic reaction bin and preventing dust accumulation.

[0006] The quick replacement mechanism includes a sliding bearing assembly, a jet pipe and a sealing replacement assembly. The sliding bearing assembly is fixedly arranged in the catalytic reaction chamber, and the sliding bearing assembly is used to carry the catalyst block. There are multiple jet pipes, and the multiple jet pipes are fixedly arranged above the sliding bearing assembly. The jet pipe is provided with multiple nozzles, and the nozzles are arranged above the catalyst block. The sealing replacement assembly is arranged on the catalytic reaction chamber, and the sealing replacement assembly is used to replace the catalyst block during the denitrification process of the denitrification device.

[0007] The sliding bearing assembly includes a support frame, a slide rail 1, a replacement bar, a slide rail 2 and a slide rail 3. The support frame is fixedly arranged in the catalytic reaction chamber, the slide rail 1 is provided with a plurality of slide rails, and a plurality of slide rails 1 are opened on the support frame on a side close to the jet pipe, the replacement bar is provided with a plurality of replacement bars, the replacement bar is slidably arranged on the slide rail 1, and a plurality of catalyst blocks are detachably arranged on the replacement bar, the slide rail 2 is provided with a plurality of slide rails, the slide rail 2 is opened on the support frame on a side close to the jet pipe, each of the slide rails 1 is opened inside one of the slide rails 2, the slide rail 3 is provided with a plurality of slide rails, the slide rail 3 is opened on the support frame on a side away from the jet pipe, the slide rail 3 corresponds to the slide rail 1 one by one, the slide rail 1 is provided with a plurality of through holes, the replacement bar is provided with a plurality of through holes corresponding to the catalyst blocks, and the through holes in the slide rail 1 correspond to the through holes on the replacement bar.

[0008] The sealing replacement assembly includes a sealing through hole 1, a sealing door 1, a sealing through hole 2, a sealing door 2 and a sealing sleeve, wherein the sealing through hole 1 is provided with a plurality of sealing through holes, and the plurality of sealing through holes 1 are all opened on the catalytic reaction chamber, the sealing through hole 1 corresponds to the slide rail 2 and the slide rail 3, the sealing door 1 is rotatably arranged on the catalytic reaction chamber, the sealing door 1 corresponds to the sealing through hole 1, the sealing through hole 2 is provided with a plurality of sealing through holes, and the plurality of sealing through holes 2 are all opened on a side of the catalytic reaction chamber away from the sealing through hole 2, the sealing through hole 2 corresponds to the replacement strip, the sealing door 2 is rotatably arranged on the catalytic reaction chamber, the sealing door 2 corresponds to the sealing through hole 2, a sealing cover and a sealing plate are provided on the sealing sleeve, the sealing sleeve slides through the sealing through hole 1 and the sealing through hole 2 in sequence, the sealing cover is detachably slidably arranged on the slide rail 2, the sealing plate is detachably slidably arranged on the slide rail 3, and the replacement strip and the catalyst block slide through the sealing through hole 2.

[0009] The heat exchange and dust removal mechanism includes a cooling paddle wheel, cooling blades, a wind shield, a cooling pipe and a water supply pipe. The cooling paddle wheel is rotatably arranged in the cooling bin. A plurality of cooling blades are arranged, and a plurality of cooling blades are circumferentially arranged on the cooling paddle wheel. The wind shield is fixedly arranged on the cooling blades. A plurality of cooling pipes are arranged on the cooling blades. A plurality of water outlet holes are opened on the cooling pipes. The plurality of cooling pipes are connected in the cooling paddle wheel. The water supply pipe is fixedly arranged on the cooling bin, and the water supply pipe is rotatably connected to the cooling pipe in the cooling paddle wheel.

[0010] A water baffle is provided on the edge of the cooling blade, a water collecting trough is provided on the lower side of the cooling blade, an end of the water collecting trough away from the cooling paddle wheel is close to the inner wall of the cooling bin, a water seal groove is provided on the cooling bin, the water seal groove is arranged in a ring shape, the cross-section of the water seal groove is U-shaped, one end of the water collecting trough close to the inner wall of the cooling bin is arranged above the water seal groove, and the water seal groove is arranged on one side outside the cooling bin and has a drain outlet.

[0011] A flue gas desulfurization, denitrification, dust removal and purification method, using the above-mentioned flue gas desulfurization, denitrification, dust removal and purification system, comprises the following steps: Step 1, flue gas mixing: the flue gas is introduced into the catalytic reaction chamber, and the mixed gas of ammonia and air is sprayed out from the jet pipe; Step 2, catalytic reaction: the mixed gas and the flue gas pass through the catalyst block to produce nitrogen and water; Step 3, flue gas cooling: sulfide gas, nitrogen and water enter the cooling bin, the airflow moves downward through the gap between the wind shield and the cooling blades, the airflow impacts the cooling blades to rotate the cooling paddle wheel, the water in the water supply pipe flows into the cooling pipe to cool the cooling blades, and the water mist in the airflow condenses into water droplets after contacting the cooling blades; Step 4, dust separation: the water in the cooling pipe flows out to the cooling blade through the water outlet, the water contacts and mixes with the dust in the airflow, and under the rotation of the cooling paddle wheel, the water flows to the edge of the cooling blade, and the water gradually gathers in the water collecting tank. After being thrown out of the water collecting tank, the water hits the inner wall of the cooling bin, flows into the water seal tank, is collected, and is discharged through the drain port; Step 5, sealed docking: open the sealing door 1, and align the sealing cover and the sealing plate on the sealing sleeve with the sealing through hole 1 and extend them into the sealing through hole 1, the sealing cover slides onto the slide rail 2, the sealing plate slides onto the slide rail 3, open the sealing door 2, and the sealing cover and the sealing plate extend out of the sealing through hole 2; Step 6, replacing the catalyst: pull the replacement bar out on the slide rail 1 through the second sealing through hole, and insert the replacement bar provided with the new catalyst block into the second sealing through hole.

[0012] The working principle and beneficial effects of the present invention are: 1. In the present invention, by setting a replacement strip and a support frame, the aligned replacement strip can be replaced by opening the corresponding sealing door 1 and sealing door 2, the sealing sleeve is extended into the sealing door 1, the sealing cover slides on the slide rail 2, the sealing cover and the support frame cover the catalyst block and the replacement strip, the sealing plate slides on the slide rail 3, the sealing plate blocks the through hole below the support frame, and the sealing cover and the sealing plate are connected with the support frame to wrap the replacement strip. At this time, the replacement strip and the catalyst block are taken out through the sealing through hole 2, and the smoke will not flow out through the sealing through hole 1 and the sealing through hole 2, so that the replacement can be carried out during the working process; 2. In the present invention, by arranging cooling blades and cooling pipes, the wind shield is arranged on the upper side of the cooling blades, so that the smoke can only impact the cooling blades through the gap between the cooling blades and the wind shield, so that most of the airflow will contact the cooling blades, and at the same time, the rotation speed of the cooling paddle wheel is guaranteed. When the cooling paddle wheel rotates, the water in the drain port moves toward the water shield under the action of centrifugal force, and the water contacts the dust in the air flow and flows to the water collecting tank. When the water and dust are thrown on the inner wall of the cooling bin, the water flows into the water seal groove. Since the water seal groove is arranged in a U shape, the smoke can be prevented from being discharged through the water seal groove, and the water is discharged through the drain port at the same time; 3. In the present invention, by providing a quick replacement mechanism, the catalyst block can be replaced while the flue gas denitrification is being carried out, and the flue gas will not be exposed. By providing a heat exchange and dust removal mechanism, the flue gas entering the dry electrostatic precipitator can be cooled, and dust will not accumulate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is another perspective structural schematic diagram of the whole of the present invention; Figure 3 It is a partial cross-sectional structural schematic diagram of the quick replacement mechanism in the present invention; Figure 4 It is a structural schematic diagram of the coordination between the catalytic reaction chamber and the quick replacement mechanism in the present invention; Figure 5 It is a schematic diagram of the structure of the support frame and the sealing sleeve in the present invention; Figure 6 It is a schematic diagram of a partial cross-sectional structure inside the cooling bin of the present invention; Figure 7 It is a schematic diagram of the structure of the cooling paddle wheel and the cooling blade in the present invention.

[0015] In the figure: 1. Denitrification device; 2. Dry electrostatic precipitator; 3. Desulfurization device; 4. Catalytic reaction chamber; 5. Catalyst block; 6. Cooling chamber; 7. Jet pipe; 8. Support frame; 9. Slide rail one; 10. Replacement strip; 11. Slide rail two; 12. Slide rail three; 13. Sealed through hole one; 14. Sealed door one; 15. Sealed through hole two; 16. Sealed door two; 17. Sealed sleeve; 18. Sealed cover; 19. Sealing plate; 20. Cooling paddle wheel; 21. Cooling blades; 22. Wind shield; 23. Cooling pipe; 24. Water supply pipe; 25. Water shield; 26. Water collecting trough; 27. Water seal trough; 28. Drainage outlet. DETAILED DESCRIPTION

[0016] The following will be combined with 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.

[0017] Embodiment 1, as Figures 1 to 7As shown, this embodiment proposes a flue gas desulfurization, denitrification and dust removal purification system, including a denitrification device 1, a dry electrostatic precipitator 2 and a desulfurization device 3, the air outlet of the denitrification device 1 is connected to the air inlet of the dry electrostatic precipitator 2, the air outlet of the dry electrostatic precipitator 2 is connected to the air inlet of the desulfurization device 3, and also includes a catalytic reaction chamber 4, a quick replacement mechanism, a cooling chamber 6 and a heat exchange dust removal mechanism, the catalytic reaction chamber 4 is fixedly arranged in the denitrification device 1, and a plurality of quick replacement mechanisms are arranged, and a plurality of quick replacement mechanisms are arranged on the catalytic reaction chamber 4, and a quick replacement mechanism is arranged on the There are multiple catalyst blocks 5, and the quick replacement mechanism is used to conveniently replace the catalyst blocks 5. The cooling bin 6 is arranged on the air outlet of the denitrification device 1. The top of the cooling bin 6 is connected to the catalytic reaction bin 4. The heat exchange and dust removal mechanism is arranged in the cooling bin 6. The heat exchange and dust removal mechanism is used to cool the flue gas passing through the catalytic reaction bin 4 and prevent dust accumulation. When the flue gas passes through the catalyst block 5, dust will remain on the catalyst block 5. In order to ensure the catalytic reaction speed, the catalyst block 5 needs to be replaced in time. The heat exchange and dust removal mechanism can remove the attached dust while cooling the flue gas.

[0018] like Figures 1 to 5 As shown, the quick replacement mechanism includes a sliding bearing assembly, a jet pipe 7 and a sealing replacement assembly. The sliding bearing assembly is fixedly arranged in the catalytic reaction chamber 4, and the sliding bearing assembly is used to carry the catalyst block 5. A plurality of jet pipes 7 are provided, and the plurality of jet pipes 7 are fixedly arranged above the sliding bearing assembly. A plurality of nozzles are provided on the jet pipe 7, and the nozzles are arranged above the catalyst block 5. The sealing replacement assembly is arranged on the catalytic reaction chamber 4, and the sealing replacement assembly is used to replace the catalyst block 5 during the denitrification process of the denitrification device 1. In this embodiment, three quick replacement mechanisms are provided, and the three quick replacement mechanisms are vertically arranged.

[0019] like Figures 3 to 5As shown, the sliding bearing assembly includes a support frame 8, a slide rail 1 9, a replacement bar 10, a slide rail 2 11 and a slide rail 3 12. The support frame 8 is fixedly arranged in the catalytic reaction chamber 4. A plurality of slide rails 1 9 are provided, and a plurality of slide rails 1 9 are opened on the support frame 8 on a side close to the jet pipe 7. A plurality of replacement bars 10 are provided, and the replacement bar 10 is slidably arranged on the slide rail 1 9. A plurality of catalyst blocks 5 are detachably arranged on the replacement bar 10. A plurality of slide rails 2 11 are provided, and the slide rails 2 11 are opened on the support frame 8 on a side close to the jet pipe 7. Each slide rail 1 9 is opened inside a slide rail 2 11. A plurality of slide rails 3 12 are provided, and the slide rails 3 12 are opened on the support frame 8 is on the side away from the jet pipe 7, the slide rail three 12 corresponds to the slide rail one 9 one by one, a plurality of through holes are opened in the slide rail 9, a plurality of through holes corresponding to the catalyst blocks 5 are opened on the replacement bar 10, the through holes in the slide rail 9 correspond to the through holes on the replacement bar 10, in this embodiment, there are specifically six slide rails 9, and there are specifically six catalyst blocks 5 arranged on the replacement bar 10, the replacement bar 10 can quickly replace the catalyst block 5 by driving the catalyst block 5 to slide, and a plurality of sliding bars slide side by side on the support frame 8, after the flue gas passes through the catalyst block 5, it can pass through the replacement bar 10 and the through holes in the slide rail 9, so that the flue gas is fully in contact with the catalyst block 5, thereby improving the catalytic conversion efficiency.

[0020] like Figures 3 to 5As shown, the sealing replacement assembly includes a sealing through hole 13, a sealing door 14, a sealing through hole 15, a sealing door 16 and a sealing sleeve 17. A plurality of sealing through holes 13 are provided, and the plurality of sealing through holes 13 are all provided on the catalytic reaction chamber 4. The sealing through hole 13 corresponds to the slide rail 2 11 and the slide rail 3 12. The sealing door 14 is rotatably provided on the catalytic reaction chamber 4. The sealing door 14 corresponds to the sealing through hole 13. A plurality of sealing through holes 15 are provided, and the plurality of sealing through holes 13 are provided. The sealing through holes 15 are both provided on the side of the catalytic reaction chamber 4 away from the sealing through hole 15. The sealing through hole 15 corresponds to the replacement strip 10. The sealing door 16 is rotatably arranged on the catalytic reaction chamber 4. The sealing door 16 corresponds to the sealing through hole 15. The sealing sleeve 17 is provided with a sealing cover 18 and a sealing plate 19. The sealing sleeve 17 slides through the sealing through hole 13 and the sealing through hole 15 in sequence. The sealing cover 18 is detachably slidably arranged on the slide rail 11. The sealing plate 19 is detachably slidably arranged on the slide rail three 12, and the replacement strip 10 and the catalyst block 5 slide through the sealing through hole two 15. In this embodiment, there are six sealing through hole one 13, sealing door one 14, sealing through hole two 15 and sealing door two 16. By opening the corresponding sealing door one 14 and sealing door two 16, the aligned replacement strip 10 can be replaced, and the sealing sleeve 17 is extended into the sealing door one 14, and the sealing cover 18 slides on the slide rail two 11. The sealing cover 18 and the support frame 8 cover the catalyst block 5 and the replacement strip 10. The sealing plate 19 slides on the slide rail three 12, and the sealing plate 19 blocks the through hole below the support frame 8. At this time, the sealing cover 18 and the sealing plate 19 are connected to the support frame 8 to wrap the replacement strip 10. At this time, the replacement strip 10 and the catalyst block 5 are taken out through the sealing through hole two 15, and the flue gas will not flow out through the sealing through hole one 13 and the sealing through hole two 15, so that it can be replaced during the working process.

[0021] like Figure 6 to Figure 7 As shown, the heat exchange and dust removal mechanism includes a cooling paddle wheel 20, a cooling blade 21, a wind shield 22, a cooling pipe 23 and a water supply pipe 24. The cooling paddle wheel 20 is rotatably arranged in the cooling bin 6. A plurality of cooling blades 21 are arranged. The plurality of cooling blades 21 are circumferentially arranged on the cooling paddle wheel 20. The wind shield 22 is fixedly arranged on the cooling paddle 21. A plurality of cooling pipes 23 are arranged on the cooling paddle 21. A plurality of water outlet holes are opened on the cooling pipe 23. The plurality of cooling pipes 23 are arranged on the cooling paddle wheel 20. The cooling paddle wheel 20 is connected, and a water supply pipe 24 is fixedly arranged on the cooling bin 6. The water supply pipe 24 is rotatably connected with the cooling pipe 23 in the cooling paddle wheel 20. In this embodiment, 8 cooling blades 21 are arranged, and the wind shield 22 is arranged on the upper side of the cooling blade 21, so that the flue gas can only impact on the cooling blade 21 through the gap between the cooling blade 21 and the wind shield 22, so that most of the airflow will contact the cooling blade 21, and at the same time the rotation speed of the cooling paddle wheel 20 is guaranteed.

[0022] like Figure 6 to Figure 7 As shown, a water baffle 25 is provided on the edge of the cooling blade 21, and a water collecting trough 26 is provided on the lower side of the cooling blade 21. The end of the water collecting trough 26 away from the cooling paddle wheel 20 is close to the inner wall of the cooling bin 6. A water seal groove 27 is provided on the cooling bin 6. The water seal groove 27 is arranged in a ring shape, and the cross-section of the water seal groove 27 is U-shaped. The end of the water collecting trough 26 close to the inner wall of the cooling bin 6 is arranged above the water seal groove 27. The water seal groove 27 is arranged on one side outside the cooling bin 6 and has a drain port 28. When the cooling paddle wheel 20 rotates, the water in the drain port 28 moves toward the water baffle 25 under the action of centrifugal force, and the water contacts the dust in the air flow and flows toward the water collecting trough 26. When the water and the dust are thrown onto the inner wall of the cooling bin 6, the water flows into the water seal groove 27. Since the water seal groove 27 is arranged in a U shape, the smoke can be prevented from being discharged through the water seal groove 27, and the water is discharged through the drain port 28 at the same time.

[0023] In this embodiment, when the flue gas impacts the cooling blades 21, the cooling blades 21 are cooled by the cooling pipes 23, so that the flue gas is cooled, and the water mist generated in the flue gas is condensed into water droplets. At the same time, the water in the cooling pipes 23 is mixed with the dust in the flue gas, and the surface of the cooling blades 21 is cleaned by the water droplets. The water droplets are thrown into the water seal groove 27. Since the water seal groove 27 is an annular U-shaped groove, the water will flow through the lower part of the water seal groove 27 to the outside of the cooling bin 6.

[0024] Embodiment 2: Embodiment 2 of the present application is supplemented on the basis of Embodiment 1, and is a method for removing sulfur dioxide, denitrification and dust from flue gas, comprising the following steps: Step 1, flue gas mixing: the flue gas is introduced into the catalytic reaction chamber 4, and a mixed gas of ammonia and air is sprayed out from the jet pipe 7; Step 2, catalytic reaction: the mixed gas and flue gas pass through the catalyst block 5 to produce nitrogen and water; Step 3, flue gas cooling: sulfide gas, nitrogen and water enter the cooling chamber 6, the airflow moves downward through the gap between the wind shield 22 and the cooling blade 21, the airflow impacts the cooling blade 21 to rotate the cooling paddle wheel 20, the water in the water supply pipe 24 is passed into the cooling pipe 23 to cool the cooling blade 21, and the water mist in the airflow condenses into water droplets after contacting the cooling blade 21; Step 4, dust separation: The water in the cooling pipe 23 flows out to the cooling blade 21 through the water outlet, and the water contacts and mixes with the dust in the airflow. Under the rotation of the cooling paddle wheel 20, the water flows to the edge of the cooling blade 21, and the water gradually gathers in the water collecting tank 26. After being thrown out of the water collecting tank 26, the water hits the inner wall of the cooling bin 6, and the water flows to the water seal groove 27, is collected, and is discharged through the drain port 28; Step 5, sealed docking: open the sealing door 14, and align the sealing cover 18 and the sealing plate 19 on the sealing sleeve 17 with the sealing through hole 13 and extend them into the sealing cover 18, slide the sealing cover 18 onto the slide rail 2 11, and slide the sealing plate 19 onto the slide rail 3 12, open the sealing door 2 16, and extend the sealing cover 18 and the sealing plate 19 out of the sealing through hole 2 15; Step 6, replacing the catalyst: pull out the replacement bar 10 on the slide rail 1 9 through the second sealing through hole 15 , and insert the replacement bar 10 provided with a new catalyst block 5 into the second sealing through hole 15 .

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flue gas desulfurization, denitrification and dust removal purification system, comprising: A denitration device (1), a dry electrostatic precipitator (2) and a desulfurization device (3), wherein the air outlet of the denitration device (1) is connected to the air inlet of the dry electrostatic precipitator (2), and the air outlet of the dry electrostatic precipitator (2) is connected to the air inlet of the desulfurization device (3), characterized in that it also includes: A catalytic reaction chamber (4), wherein the catalytic reaction chamber (4) is fixedly arranged in the denitration device (1); A quick replacement mechanism, wherein a plurality of the quick replacement mechanisms are provided, the plurality of the quick replacement mechanisms are provided on the catalytic reaction chamber (4), a plurality of catalyst blocks (5) are provided on the quick replacement mechanism, and the quick replacement mechanism is used to conveniently replace the catalyst blocks (5); A cooling bin (6), the cooling bin (6) being arranged on the gas outlet of the denitration device (1), and the top of the cooling bin (6) being connected to the catalytic reaction bin (4); A heat exchange and dust removal mechanism, wherein the heat exchange and dust removal mechanism is arranged in the cooling chamber (6), and is used to cool the flue gas passing through the catalytic reaction chamber (4) and prevent dust accumulation.

2. A flue gas desulfurization, denitrification and dust removal purification system according to claim 1, characterized in that: The quick replacement mechanism comprises: A sliding bearing assembly, the sliding bearing assembly being fixedly arranged in the catalytic reaction chamber (4), the sliding bearing assembly being used to bear the catalyst block (5); A jet pipe (7), wherein a plurality of the jet pipes (7) are provided, and the plurality of the jet pipes (7) are fixedly arranged above the sliding bearing assembly, and a plurality of nozzles are arranged on the jet pipe (7), and the nozzles are arranged above the catalyst block (5); A seal replacement component, the seal replacement component is arranged on the catalytic reaction chamber (4), and the seal replacement component is used to replace the catalyst block (5) during the denitration process of the denitration device (1).

3. A flue gas desulfurization, denitrification and dust removal purification system according to claim 2, characterized in that: The sliding bearing assembly comprises: A support frame (8), the support frame (8) being fixedly arranged in the catalytic reaction chamber (4); A slide rail (9), wherein a plurality of the slide rails (9) are provided, and the plurality of slide rails (9) are arranged on a side of the support frame (8) close to the jet pipe (7); A replacement bar (10), wherein a plurality of the replacement bars (10) are provided, the replacement bar (10) being slidably arranged on the first slide rail (9), and a plurality of the catalyst blocks (5) being detachably arranged on the replacement bar (10); A second slide rail (11), wherein a plurality of the second slide rails (11) are provided, the second slide rail (11) being opened on a side of the support frame (8) close to the jet pipe (7), and each of the first slide rails (9) being opened inside a second slide rail (11); Slide rail three (12), a plurality of slide rails three (12) are provided, and the slide rail three (12) is opened on a side of the support frame (8) away from the jet pipe (7), and the slide rail three (12) corresponds one-to-one with the slide rail one (9).

4. A flue gas desulfurization, denitrification and dust removal purification system according to claim 3, characterized in that: The slide rail one (9) is provided with a plurality of through holes, the replacement bar (10) is provided with a plurality of through holes corresponding to the catalyst block (5), and the through holes in the slide rail one (9) correspond to the through holes on the replacement bar (10).

5. A flue gas desulfurization, denitrification and dust removal purification system according to claim 4, characterized in that: The seal replacement assembly comprises: A sealing through hole one (13), wherein a plurality of the sealing through holes one (13) are provided, and the plurality of sealing through holes one (13) are all provided on the catalytic reaction chamber (4), and the sealing through hole one (13) corresponds to the slide rail two (11) and the slide rail three (12); A sealing door (14), the sealing door (14) being rotatably disposed on the catalytic reaction chamber (4), the sealing door (14) corresponding to the sealing through hole (13); A second sealing through hole (15), wherein a plurality of the second sealing through holes (15) are provided, and the plurality of second sealing through holes (15) are all provided on a side of the catalytic reaction chamber (4) away from the second sealing through hole (15), and the second sealing through hole (15) corresponds to the replacement strip (10); A second sealing door (16), the second sealing door (16) being rotatably disposed on the catalytic reaction chamber (4), the second sealing door (16) corresponding to the second sealing through hole (15); A sealing sleeve (17), wherein a sealing cover (18) and a sealing plate (19) are arranged on the sealing sleeve (17), wherein the sealing sleeve (17) slides through the sealing through hole 1 (13) and the sealing through hole 2 (15) in sequence, wherein the sealing cover (18) is detachably slidably arranged on the slide rail 2 (11), and the sealing plate (19) is detachably slidably arranged on the slide rail 3 (12).

6. A flue gas desulfurization, denitrification and dust removal purification system according to claim 5, characterized in that: The replacement strip (10) and the catalyst block (5) slide through the second sealing through hole (15).

7. A flue gas desulfurization, denitrification and dust removal purification system according to claim 6, characterized in that: The heat exchange and dust removal mechanism comprises: a cooling paddle wheel (20), the cooling paddle wheel (20) being rotatably disposed in the cooling bin (6); cooling blades (21), a plurality of cooling blades (21) being provided, and the plurality of cooling blades (21) being circumferentially arranged on the cooling paddle wheel (20); a windshield (22), the windshield (22) being fixedly disposed on the cooling blade (21); a cooling pipe (23), wherein a plurality of the cooling pipes (23) are provided on the cooling blade (21), a plurality of water outlet holes are opened on the cooling pipe (23), and the plurality of cooling pipes (23) are connected in the cooling paddle wheel (20); A water supply pipe (24), the water supply pipe (24) being fixedly arranged on the cooling bin (6), and the water supply pipe (24) being rotatably connected to the cooling pipe (23) in the cooling paddle wheel (20).

8. A flue gas desulfurization, denitrification and dust removal purification system according to claim 7, characterized in that: A water baffle (25) is provided on the edge of the cooling blade (21), a water collecting trough (26) is provided on the lower side of the cooling blade (21), and an end of the water collecting trough (26) away from the cooling paddle wheel (20) is close to the inner wall of the cooling bin (6).

9. A flue gas desulfurization, denitrification and dust removal purification system according to claim 8, characterized in that: The cooling bin (6) is provided with a water seal groove (27), the water seal groove (27) being arranged in an annular shape, the cross section of the water seal groove (27) being U-shaped, one end of the water collecting trough (26) close to the inner wall of the cooling bin (6) being arranged above the water seal groove (27), and the water seal groove (27) being arranged on one side outside the cooling bin (6) and having a drainage outlet (28).

10. A flue gas desulfurization, denitrification, dust removal and purification method, using a flue gas desulfurization, denitrification, dust removal and purification system according to claim 9, characterized in that: The following steps are involved: S1. Flue gas mixing: Flue gas is introduced into the catalytic reaction chamber (4), and a mixed gas of ammonia and air is sprayed out from the spray pipe (7); S2, catalytic reaction: the mixed gas and the flue gas pass through the catalyst block (5) to generate nitrogen and water; S3, flue gas cooling: sulfide gas, nitrogen and water enter the cooling chamber (6), the airflow moves downward through the gap between the wind shield (22) and the cooling blade (21), the airflow impacts the cooling blade (21) to rotate the cooling paddle wheel (20), the water in the water supply pipe (24) flows into the cooling pipe (23), the cooling blade (21) is cooled, and the water mist in the airflow condenses into water droplets after contacting the cooling blade (21); S4, dust separation: the water in the cooling pipe (23) flows out through the water outlet onto the cooling blade (21), the water contacts and mixes with the dust in the airflow, and under the rotation of the cooling paddle wheel (20), the water flows toward the edge of the cooling blade (21), and the water gradually gathers in the water collecting tank (26). After being thrown out of the water collecting tank (26), the water hits the inner wall of the cooling bin (6), flows into the water seal groove (27), is collected, and is discharged through the drain port (28); S5, sealed docking: open the sealing door 1 (14), and align the sealing cover (18) and the sealing plate (19) on the sealing sleeve (17) with the sealing through hole 1 (13) and extend them into the sealing through hole 1, the sealing cover (18) slides onto the slide rail 2 (11), the sealing plate (19) slides onto the slide rail 3 (12), open the sealing door 2 (16), and the sealing cover (18) and the sealing plate (19) extend out of the sealing through hole 2 (15); S6. Replace the catalyst: pull the replacement strip (10) out on the slide rail (9) through the second sealing through hole (15), and insert the replacement strip (10) provided with a new catalyst block (5) into the second sealing through hole (15).

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