Flue gas denitration equipment and denitration method for hearth flue gas treatment

Abstract

The invention relates to the technical field of flue gas denitration equipment, and discloses flue gas denitration equipment and a denitration method for hearth flue gas treatment.The flue gas denitration equipment comprises a tank body, a flue gas inlet pipe, an ammonia inlet pipe and a flue gas exhaust pipe, and a filter screen and a catalysis pipe are rotationally arranged in the tank body; according to the flue gas denitration equipment, by arranging the flue gas inlet pipe, the ammonia inlet pipe, the flue gas exhaust pipe, the filter screen and the catalysis pipe, when flue gas enters the tank body, large-particle impurities mixed in the flue gas need to be filtered out through the filter screen before the flue gas is mixed with ammonia gas, and by arranging a filter screen cleaning assembly and a screen scraping plate, the large-particle impurities attached to the filter screen can be continuously scraped away; the water return nozzle can spray the filter screen, so that impurities which are difficult to scrape off can be flushed off, and the pipe wall cleaning assembly is arranged, so that impurities which are adhered to the outer wall of the catalytic pipe can be scraped off, the surface of the catalytic pipe is cleaner, and the catalytic effect of the catalytic pipe on nitrogen oxide and ammonia gas can be better maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas denitration equipment, in particular to a flue gas denitration equipment and a denitration method for treating furnace flue gas. Background Art

[0002] The furnace is a three-dimensional space surrounded by furnace walls for fuel combustion. After the fuel burns in the furnace, it will produce flue gas containing nitrogen. In order to avoid direct discharge of flue gas, flue gas denitrification equipment is needed to remove nitrogen oxides in the flue gas. The most common flue gas denitrification method is selective catalytic reduction. Under the action of the catalyst, ammonia is sprayed into the flue gas to reduce nitrogen oxides to nitrogen and water. This method has high denitrification efficiency and mature technology.

[0003] Chinese patent CN111450684B discloses a flue gas denitrification device, which drives multiple groups of air inlet holes, stirring barrels, multiple groups of stepped flat plates, multiple groups of sieve plates, multiple groups of centrifugal plates and multiple groups of air diffusion pipes to rotate by setting a hollow shaft, so that the mixed gas is fully mixed to ensure the denitrification effect. However, in the process of flue gas denitrification, since the flue gas contains not only nitrogen oxides but also often contains a lot of dust, the dust easily blocks the sieve plates and air diffusion holes, resulting in a decrease in the denitrification efficiency of the device. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a flue gas denitrification device and a denitrification method for furnace flue gas treatment, which has the advantage of being able to clean the inside of the equipment and solves the problems mentioned in the above background technology.

[0005] (II) Technical solution In order to solve the above technical problems, the present invention provides the following technical solutions: A flue gas denitrification device comprises a tank body, a smoke inlet pipe, an ammonia inlet pipe and a smoke exhaust pipe, wherein a filter screen and a catalytic tube are rotatably arranged inside the tank body, a water tank is arranged above the filter screen, the upper end of the catalytic tube passes through the water tank and is provided with a smoke ejection pipe, and a vent hole is provided on the side wall of the catalytic tube below the water tank, the smoke inlet pipe and the ammonia inlet pipe are both fixedly mounted on one side outer wall of the tank body, and the smoke inlet pipe and the ammonia inlet pipe are respectively arranged on both sides of the filter screen, the smoke exhaust pipe is fixedly mounted on the top of the tank body, and a cleaning mechanism is also arranged on the tank body, and the cleaning mechanism comprises a filter screen cleaning component and a pipe wall cleaning component; The filter cleaning assembly includes a scraper plate, a condensation pool and a return water nozzle, wherein the scraper plate is used to scrape off impurities adhering to the filter, the condensation pool is used to collect water separated from the ammonia water, and the return water nozzle is used to spray the water output from the condensation pool onto the surface of the filter for washing; The tube wall cleaning assembly includes a tube scraper plate, a floating plate and a reciprocating screw. The tube scraper plate is sleeved on the outer side of the catalytic tube. The floating plate floats in the condensation pool. The lower end of the reciprocating screw is rotatably mounted on the floating plate. The reciprocating screw is threadedly connected to one end of the tube scraper plate. When the reciprocating screw descends to the lowest height, the reciprocating screw is driven by the catalytic tube to rotate. A wire mesh demister is installed above the water tank.

[0006] Preferably, a smoke barrier tube is fixedly installed on the lower surface of the filter screen, the lower end of the smoke barrier tube is slidably sealed with the top of the condensation tank, a guide tube is arranged between the smoke barrier tube and the catalytic tube, the upper end of the guide tube is fixedly connected to the lower surface of the water tank, and the lower end of the guide tube is close to the bottom of the smoke barrier tube, and a spoiler is fixedly installed on the inner side of the smoke barrier tube.

[0007] Preferably, an annular nozzle is fixedly mounted on the lower surface of the water tank, an atomizing nozzle is arranged on the lower surface of the annular nozzle, and the interior of the annular nozzle is connected to one end of the ammonia inlet pipe, and the annular nozzle is arranged between the smoke barrier pipe and the guide pipe.

[0008] Preferably, the filter cleaning assembly also includes a rotating shaft and a water pump, a connecting block is rotatably installed at the lower end of the rotating shaft, the connecting block is fixedly connected to an inner wall of one side of the tank body, the scraper plate is fixedly installed at the upper end of the rotating shaft, the outer sides of the rotating shaft and the smoke shielding pipe are fixedly installed with transmission gears, the transmission gears are meshingly connected, the water pump is fixedly installed at the bottom of the tank body, the suction end of the water pump passes through the bottom wall of the tank body and extends to the interior of the condensation pool, and the delivery end of the water pump is connected to the interior of the return water nozzle, the scraper plate is arranged below the filter, the return water nozzle is arranged above the filter, and the scraper plate and the return water nozzle are arranged relative to each other.

[0009] Preferably, the tube wall cleaning assembly also includes a movable bevel gear and a fixed bevel gear, the movable bevel gear is fixedly mounted on the upper end of the reciprocating screw, the fixed bevel gear is fixedly mounted on the outer surface of the catalytic tube, the movable bevel gear and the fixed bevel gear are adaptively meshed, a connecting seat is fixedly mounted on the upper and lower sides of the inner side surface of the guide tube, a rotating block is rotatably mounted on the connecting seat, and the reciprocating screw is slidably connected to the rotating block.

[0010] Preferably, a slide seat is fixedly mounted on the inner side of the guide tube, a guide rod is slidably mounted on the slide seat, the lower end of the guide rod is fixedly connected to the floating plate, and the guide rod is slidably connected to one end of the scraper plate, and the guide rod and the reciprocating screw are symmetrically arranged on both sides of the catalytic tube.

[0011] Preferably, a recoil pipe is fixedly installed at the lower end of the catalytic tube, and the recoil pipe penetrates the bottom wall of the tank body and extends to the outside of the tank body, and a valve is provided at the lower end of the recoil pipe, and a driving motor is fixedly installed at the bottom of the tank body, and the driving end of the driving motor penetrates the bottom wall of the tank body and extends to the inside of the tank body, and the driving end of the driving motor and the outer side surface of the smoke barrier tube are both fixedly installed with driving gears, and the driving gears are meshingly connected, and the driving end of the driving motor and the outer side surface of the recoil pipe are both fixedly installed with transmission wheels, and the transmission wheels are connected by transmission belts.

[0012] Preferably, a one-way valve is provided on the smoke-spraying pipe, and a rotating tube is rotatably installed at one end of the smoke-spraying pipe, a smoke-spraying hole is opened on the rotating tube, and a driven gear is fixedly installed on the rotating tube, a cross bar is fixedly installed between the inner walls of the water tank, a toothed disc is fixedly installed at the lower end of the cross bar, and the lower surface of the toothed disc is meshingly connected with the driven gear.

[0013] Preferably, a branch pipe and a drain pipe are provided on the tank body, the two ends of the branch pipe are respectively connected to the delivery end of the water pump and the water inlet end of the return water nozzle, and the other end of the branch pipe extends to the interior of the water tank, the drain pipe is connected to the inner bottom of the tank body, and the drain pipe is arranged on the outside of the condensation tank, and a valve is provided on the drain pipe.

[0014] The present invention also discloses a denitration method for furnace flue gas treatment, the specific steps of which are: Connect the smoke inlet pipe to the smoke outlet pipe of the furnace, and connect the ammonia inlet pipe to the infusion container pipeline storing ammonia water; After the flue gas enters the tank, it is filtered through the filter screen to filter out the mixed large particles of impurities, and then mixed with the ammonia decomposed in the ammonia water and enters the catalytic tube. When passing through the catalytic tube, it is catalyzed by the catalyst material on the catalytic tube, so that the nitrogen oxides and ammonia react quickly to generate nitrogen and water. The nitrogen is discharged into the water tank through the smoke injection pipe on the top of the catalytic tube. After leaving the water in the water tank, it passes through the wire mesh demister to filter out the moisture in the flue gas and then is discharged from the tank through the exhaust pipe; After the flue gas denitrification equipment has been working for a period of time, the cleaning mechanism is started to transport the water collected in the condensation pool to the return water nozzle to flush the filter and the scraper plate. When the water level in the condensation pool drops to a certain level, the reciprocating screw is driven by the catalytic tube to rotate, causing the scraper plate to slide up and down on the outer side of the catalytic tube to scrape off impurities adhering to the surface of the catalytic tube.

[0015] (III) Beneficial effects Compared with the prior art, the present invention provides a flue gas denitration device and a denitration method for furnace flue gas treatment, which has the following beneficial effects: 1. The flue gas denitrification equipment is provided with a smoke inlet pipe, an ammonia inlet pipe, a smoke exhaust pipe, a filter and a catalytic tube, so that when the flue gas enters the tank body, it needs to first pass through the filter to filter out large particles of impurities mixed in the flue gas before it can be mixed with ammonia, so as to prevent large particles of impurities from adhering to the surface of the catalytic tube and affecting the nitrogen produced after the reaction of nitrogen oxides and ammonia passing through the catalytic tube. By providing a filter cleaning component, the scraper plate can continuously scrape off large particles of impurities adhering to the filter, and the return water nozzle can spray the filter, so that impurities that are difficult to scrape off can be washed off. By providing a pipe wall cleaning component, the impurities sticking to the outer wall of the catalytic tube can be scraped off, so that the surface of the catalytic tube is cleaner, so that the catalytic effect of the catalytic tube on nitrogen oxides and ammonia can be better maintained.

[0016] 2. The flue gas denitrification equipment is equipped with a scraper plate, a floating plate and a reciprocating screw. Since the scraper plate can move up and down only when the floating plate is in a low position, the reciprocating screw can be driven to rotate by the catalytic tube when the water in the condensation pool is pumped away, and the scraper plate can scrape off the impurities on the surface of the catalytic tube, so that the scraper plate will not work continuously, avoiding the wear of the catalyst components on the surface of the catalytic tube.

[0017] 3. The flue gas denitrification equipment is provided with a smoke barrier pipe and a guide pipe, so that the mixed oxides and ammonia need to go through a longer journey before they can contact the catalytic tube. By setting a spoiler, the oxides and ammonia can be better mixed together during the flow, making the reaction probability of the oxides and ammonia greater. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the three-dimensional structural cross-sectional views of the flue gas denitration equipment of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged local structure at point A in the middle; Figure 3 For the present invention Figure 1 A magnified schematic diagram of the local structure at B in the middle; Figure 4 This is the second sectional view of the three-dimensional structure of the flue gas denitration equipment of the present invention; Figure 5 This is the third sectional view of the three-dimensional structure of the flue gas denitration equipment of the present invention; Figure 6 For the present invention Figure 5 A magnified schematic diagram of the local structure at C in the middle; Figure 7 This is one of the three-dimensional structural schematic diagrams of the flue gas denitration equipment of the present invention; Figure 8 This is the second schematic diagram of the three-dimensional structure of the flue gas denitrification equipment of the present invention.

[0019] In the figure: 1. Tank body; 11. Smoke inlet pipe; 12. Ammonia inlet pipe; 121. Annular nozzle; 13. Smoke exhaust pipe; 14. Branch pipe; 15. Sewage pipe; 2. Filter; 21. Smoke barrier; 22. Spoiler; 3. Catalytic tube; 31. Smoke ejection tube; 32. Ventilation hole; 33. Recoil tube; 34. Rotating tube; 35. Smoke ejection hole; 36. Driven gear; 4. water tank; 41. crossbar; 42. toothed disc; 5. Cleaning mechanism; 51. Filter cleaning assembly; 511. Scraper plate; 512. Condensation pool; 513. Return water nozzle; 514. Rotating shaft; 515. Water pump; 516. Connecting block; 517. Transmission gear; 52. Pipe wall cleaning assembly; 521. Scraper plate; 522. Floating plate; 523. Reciprocating screw; 524. Movable bevel gear; 525. Fixed bevel gear; 526. Guide rod; 6. flow guide pipe; 61. connecting seat; 62. rotating block; 63. sliding seat; 7. driving motor; 71. driving gear; 72. transmission wheel; 8. Wire mesh demister. DETAILED DESCRIPTION

[0020] 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.

[0021] Embodiment 1 See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8 The present invention provides a flue gas denitrification device, comprising a tank body 1, a smoke inlet pipe 11, an ammonia inlet pipe 12 and a smoke exhaust pipe 13, wherein a filter screen 2 and a catalytic tube 3 are rotatably arranged inside the tank body 1, a water tank 4 is arranged above the filter screen 2, the upper end of the catalytic tube 3 passes through the water tank 4 and is provided with a smoke injection pipe 31, and a vent hole 32 is provided on the side wall of the catalytic tube 3 below the water tank 4, the smoke inlet pipe 11 and the ammonia inlet pipe 12 are both fixedly mounted on one side outer wall of the tank body 1, and the smoke inlet pipe 11 and the ammonia inlet pipe 12 are respectively arranged on both sides of the filter screen 2, the smoke exhaust pipe 13 is fixedly mounted on the top of the tank body 1, and a cleaning mechanism 5 is also arranged on the tank body 1, and the cleaning mechanism 5 includes a filter screen cleaning component 51 and a pipe wall cleaning component 52; The filter cleaning assembly 51 includes a scraper plate 511, a condensation pool 512 and a return water nozzle 513. The scraper plate 511 is used to scrape off impurities adhering to the filter 2. The condensation pool 512 is used to collect water separated from the ammonia water. The return water nozzle 513 is used to spray the water output from the condensation pool 512 onto the surface of the filter 2 for washing. The tube wall cleaning assembly 52 includes a tube scraper plate 521, a floating plate 522 and a reciprocating screw 523. The tube scraper plate 521 is sleeved on the outer side of the catalytic tube 3. The floating plate 522 floats in the condensation pool 512. The lower end of the reciprocating screw 523 is rotatably mounted on the floating plate 522. The reciprocating screw 523 is threadedly connected to one end of the tube scraper plate 521. When the reciprocating screw 523 drops to the lowest height, the reciprocating screw 523 is driven by the catalytic tube 3 to rotate. A wire mesh demister 8 is installed above the water tank 4 .

[0022] As can be seen from the above, the flue gas denitrification equipment is provided with a smoke inlet pipe 11, an ammonia inlet pipe 12, a smoke exhaust pipe 13, a filter 2 and a catalytic tube 3, so that when the flue gas enters the tank body 1, it needs to first pass through the filter 2 to filter out large particles of impurities mixed in the flue gas before it can be mixed with ammonia, so as to prevent large particles of impurities from adhering to the surface of the catalytic tube 3 and affecting the nitrogen generated after the reaction of nitrogen oxides and ammonia passing through the catalytic tube 3. By providing a filter cleaning component 51, the scraper plate 511 can continuously scrape off large particles of impurities adhering to the filter 2, and the return water nozzle 513 can spray the filter 2, so that impurities that are difficult to scrape off can be washed off, and the setting of the condensation tank 512 can collect the water generated when the ammonia water is decomposed into ammonia and water, and use it to wash the filter 2. By setting up the tube wall cleaning component 52, the impurities sticking to the outer wall of the catalytic tube 3 can be scraped off, so that the surface of the catalytic tube 3 is cleaner, so that the catalytic effect of the catalytic tube 3 on nitrogen oxides and ammonia can be better maintained. Since the tube wall cleaning component 52 includes a scraper plate 521, a floating plate 522 and a reciprocating screw 523, the scraper plate 521 can only move up and down when the floating plate 522 is in a low position, and the floating plate 522 floats in the condensation pool 512. Therefore, only when the water in the condensation pool 512 is pumped away, the reciprocating screw 523 can be driven to rotate by the catalytic tube 3, and the scraper plate 521 will scrape off the impurities on the surface of the catalytic tube 3, so that the scraper plate 521 will not work continuously, thereby avoiding the wear of the catalyst components on the surface of the catalytic tube 3.

[0023] When the device is used, the smoke inlet pipe 11 is connected to the smoke outlet pipe of the furnace, and the ammonia inlet pipe 12 is connected to the infusion container pipeline storing ammonia water; after the smoke enters the tank body 1, it is filtered through the filter 2 for filtering the mixed large particles of impurities, and then mixed with the ammonia decomposed in the ammonia water and enters the catalytic tube 3. When passing through the catalytic tube 3, it is catalyzed by the catalyst material on the catalytic tube 3, so that the nitrogen oxides and ammonia react quickly to generate nitrogen and water, wherein the nitrogen is discharged into the water tank 4 through the smoke injection pipe 31 at the top of the catalytic tube 3, and after leaving the water body of the water tank 4, it passes through the wire mesh demister 8 After the moisture in the flue gas is screened out, it is discharged from the smoke exhaust pipe 13 to the tank body 1, and the moisture screened out in the wire mesh demister 8 is condensed and falls into the water tank 4; after the flue gas denitrification equipment has been working for a period of time, the cleaning mechanism 5 is started to transport the moisture collected in the condensation pool 512 to the return water nozzle 513 to rinse the filter screen 2 and the scraper plate 511. When the water level in the condensation pool 512 drops to a certain level, the reciprocating screw 523 is driven to rotate by the catalytic tube 3, so that the scraper plate 521 slides up and down on the outer side of the catalytic tube 3 to scrape off impurities adhering to the surface of the catalytic tube 3.

[0024] Embodiment 2 like Figure 1 , Figure 4 and Figure 5 As shown, the difference between this embodiment and the above embodiment lies in that a smoke barrier tube 21 is fixedly installed on the lower surface of the filter 2, the lower end of the smoke barrier tube 21 is slidably sealed with the top of the condensation pool 512, a guide tube 6 is arranged between the smoke barrier tube 21 and the catalytic tube 3, the upper end of the guide tube 6 is fixedly connected to the lower surface of the water tank 4, and the lower end of the guide tube 6 is close to the bottom of the smoke barrier tube 21, and a spoiler 22 is fixedly installed on the inner side of the smoke barrier tube 21.

[0025] As can be seen from the above, by providing the smoke barrier tube 21 and the guide tube 6, the mixed oxide and ammonia need to travel a longer distance before they can contact the catalytic tube 3. By providing the spoiler 22, the oxide and ammonia can be better mixed together during the flow, making the reaction probability of the oxide and ammonia greater, thereby improving the denitrification rate of the equipment.

[0026] An annular nozzle 121 is fixedly mounted on the lower surface of the water tank 4 , an atomizing nozzle is arranged on the lower surface of the annular nozzle 121 , and the interior of the annular nozzle 121 is connected to one end of the ammonia inlet pipe 12 , and the annular nozzle 121 is arranged between the smoke barrier pipe 21 and the guide pipe 6 .

[0027] It can be seen from the above that by providing the annular nozzle 121 and the atomizing nozzle, the ammonia water can be more dispersed, which facilitates the decomposition of ammonia gas and water.

[0028] Embodiment 3 like Figure 1 , Figure 2 and Figure 3As shown, the difference between this embodiment and the above embodiment is that the filter cleaning assembly 51 also includes a rotating shaft 514 and a water pump 515, the lower end of the rotating shaft 514 is rotatably mounted with a connecting block 516, and the connecting block 516 is fixedly connected to the inner wall of one side of the tank body 1, the scraper plate 511 is fixedly mounted on the upper end of the rotating shaft 514, and the outer side surfaces of the rotating shaft 514 and the smoke barrier pipe 21 are fixedly mounted with a transmission gear 517, and the transmission gears 517 are meshingly connected with each other, and the water pump 515 is fixedly mounted on the bottom of the tank body 1, and the suction end of the water pump 515 passes through the bottom wall of the tank body 1 and extends to the interior of the condensation pool 512, and the delivery end of the water pump 515 is connected to the interior of the return water nozzle 513, the scraper plate 511 is arranged below the filter 2, and the return water nozzle 513 is arranged above the filter 2, and the scraper plate 511 and the return water nozzle 513 are arranged relative to each other.

[0029] As can be seen from the above, since the rotating shaft 514 is rotatably installed on the inner wall of one side of the tank body 1, and the rotating shaft 514 and the smoke barrier tube 21 are connected by the transmission gear 517, the scraper plate 511 continues to rotate with the rotation of the smoke barrier tube 21, and can continuously rotate to scrape off large particles of impurities adhering to the filter screen 2. The scraper plate 511 is arranged below the filter screen 2, and the return water nozzle 513 is arranged above the filter screen 2. When the return water nozzle 513 sprays water, it can not only clean the filter screen 2, but also rinse the scraper plate 511.

[0030] The tube wall cleaning assembly 52 also includes a movable bevel gear 524 and a fixed bevel gear 525. The movable bevel gear 524 is fixedly mounted on the upper end of the reciprocating screw 523, and the fixed bevel gear 525 is fixedly mounted on the outer surface of the catalytic tube 3. The movable bevel gear 524 and the fixed bevel gear 525 are adaptively meshed. A connecting seat 61 is fixedly mounted on the upper and lower sides of the inner side surface of the guide tube 6. A rotating block 62 is rotatably mounted on the connecting seat 61, and the reciprocating screw 523 is slidably connected to the rotating block 62.

[0031] As can be seen from the above, since the reciprocating screw 523 slides and is rotatably installed on the connecting seat 61 through the rotating block 62, the reciprocating screw 523 can rotate around its axis and move up and down. Since the lower end of the reciprocating screw 523 is rotatably installed on the floating plate 522, when the water level change in the condensation pool 512 drives the floating plate 522 to move up and down, the reciprocating screw 523 can move up and down. When the water level in the condensation pool 512 is low, the reciprocating screw 523 is driven by the floating plate 522 to descend, so that the movable bevel gear 524 fixed on the reciprocating screw 523 is engaged with the fixed bevel gear 525 fixed on the catalytic tube 3, and the scraper plate 521 can move up and down to scrape off impurities adhering to the surface of the catalytic tube 3.

[0032] A slide seat 63 is also fixedly installed on the inner side of the guide tube 6, and a guide rod 526 is slidably installed on the slide seat 63. The lower end of the guide rod 526 is fixedly connected to the floating plate 522, and the guide rod 526 is slidably connected to one end of the scraper plate 521. The guide rod 526 and the reciprocating screw 523 are symmetrically arranged on both sides of the catalytic tube 3.

[0033] As can be seen from the above, by setting the guide rod 526, on the one hand, the floating plate 522 can be made more balanced, and at the same time, the pressure of the scraper plate 521 on the outer surface of the catalytic tube 3 can be controlled to avoid the scraper plate 521 applying a larger pressure on one side of the outer surface of the catalytic tube 3 and a smaller pressure on the other side, thereby affecting the effect of scraping off impurities.

[0034] Embodiment 4 like Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, the difference between this embodiment and the above embodiment lies in that a recoil pipe 33 is fixedly installed at the lower end of the catalytic tube 3, the recoil pipe 33 penetrates the bottom wall of the tank body 1 and extends to the outside of the tank body 1, and a valve is provided at the lower end of the recoil pipe 33, a driving motor 7 is fixedly installed at the bottom of the tank body 1, the driving end of the driving motor 7 penetrates the bottom wall of the tank body 1 and extends to the inside of the tank body 1, a driving gear 71 is fixedly installed at the driving end of the driving motor 7 and the outer side surface of the smoke barrier pipe 21, and the driving gears 71 are meshingly connected, and a transmission wheel 72 is fixedly installed at the driving end of the driving motor 7 and the outer side surface of the recoil pipe 33, and the transmission wheels 72 are connected by a transmission belt.

[0035] As can be seen from the above, by setting up the driving motor 7, the rotation of the catalytic tube 3 and the smoke shielding tube 21 can be controlled, so that the spoiler 22 can better separate the gas, so that the nitrogen oxides and ammonia are mixed evenly, and at the same time, the smoke pipe 31 will not spray smoke in one direction; by setting up the recoil pipe 33, the recoil pipe 33 can also be connected to the external water pipe to flush the inside of the catalytic tube 3.

[0036] A one-way valve is provided on the smoke-spraying pipe 31, and a rotating pipe 34 is rotatably installed at one end of the smoke-spraying pipe 31, a smoke-spraying hole 35 is opened on the rotating pipe 34, and a driven gear 36 is fixedly installed on the rotating pipe 34. A cross bar 41 is fixedly installed between the inner walls of the water tank 4, and a toothed disc 42 is fixedly installed at the lower end of the cross bar 41, and the lower surface of the toothed disc 42 is meshed and connected with the driven gear 36.

[0037] As can be seen from the above, by providing the toothed disc 42 and the driven gear 36, when the catalytic tube 3 rotates, the rotating tube 34 can also rotate, so that the smoke in the smoke injection hole 35 is ejected in different directions, and the smoke can be better mixed with the water when entering the water tank 4, so that the impurities that can be dissolved in water can be better separated from the smoke.

[0038] The tank body 1 is provided with a branch pipe 14 and a drain pipe 15, the two ends of the branch pipe 14 are respectively connected to the delivery end of the water pump 515 and the water inlet end of the return water nozzle 513, and the other end of the branch pipe 14 extends to the interior of the water tank 4, the drain pipe 15 is connected to the inner bottom of the tank body 1, and the drain pipe 15 is arranged on the outside of the condensation tank 512, and a valve is arranged on the drain pipe 15.

[0039] As can be seen from the above, by setting up the branch pipe 14, when the water level in the water tank 4 exceeds the height of the pipe mouth of the branch pipe 14 inside the water tank 4, the water flows to the return water nozzle 513 through the branch pipe 14; by setting up the sewage pipe 15, the dirt that falls to the bottom of the tank body 1 when flushing the filter screen 2 can be discharged.

[0040] Embodiment 5 See also Figure 1 - Figure 8 The present invention also discloses a denitrification method for furnace flue gas treatment, the specific steps of which are: Connect the smoke inlet pipe 11 to the smoke outlet pipe of the furnace, and connect the ammonia inlet pipe 12 to the infusion container pipeline storing ammonia water; After the flue gas enters the tank body 1, it is filtered through the filter screen 2 for filtering the mixed large particles of impurities, and then mixed with the ammonia decomposed in the ammonia water and enters the catalytic tube 3. When passing through the catalytic tube 3, it is catalyzed by the catalyst material on the catalytic tube 3, so that the nitrogen oxides and ammonia react quickly to generate nitrogen and water, wherein the nitrogen is discharged into the water tank 4 through the smoke injection pipe 31 at the top of the catalytic tube 3, and after leaving the water body of the water tank 4, it is filtered out of the water in the flue gas through the wire mesh demister 8, and then discharged from the tank body 1 through the exhaust pipe 13; After the flue gas denitrification equipment has been working for a period of time, the cleaning mechanism 5 is started to transport the water collected in the condensation tank 512 to the return water nozzle 513 to rinse the filter screen 2 and the scraper plate 511. When the water level in the condensation tank 512 drops to a certain level, the reciprocating screw 523 is driven to rotate by the catalytic tube 3, so that the scraper plate 521 slides up and down on the outer side of the catalytic tube 3 to scrape off impurities adhering to the surface of the catalytic tube 3.

[0041] 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. A flue gas denitrification device, comprising a tank body, a smoke inlet pipe, an ammonia inlet pipe and a smoke exhaust pipe, characterized in that: A filter screen and a catalytic tube are rotatably arranged inside the tank body, a water tank is arranged above the filter screen, the upper end of the catalytic tube passes through the water tank and is equipped with a smoke ejection pipe, and a vent hole is opened on the side wall of the catalytic tube below the water tank, the smoke inlet pipe and the ammonia inlet pipe are both fixedly installed on one side outer wall of the tank body, and the smoke inlet pipe and the ammonia inlet pipe are respectively arranged on both sides of the filter screen, the smoke exhaust pipe is fixedly installed on the top of the tank body, and a cleaning mechanism is also arranged on the tank body, and the cleaning mechanism includes a filter screen cleaning component and a pipe wall cleaning component; The filter cleaning assembly includes a scraper plate, a condensation pool and a return water nozzle, wherein the scraper plate is used to scrape off impurities adhering to the filter, the condensation pool is used to collect water separated from the ammonia water, and the return water nozzle is used to spray the water output from the condensation pool onto the surface of the filter for washing; The tube wall cleaning assembly includes a tube scraper plate, a floating plate and a reciprocating screw. The tube scraper plate is sleeved on the outer side of the catalytic tube. The floating plate floats in the condensation pool. The lower end of the reciprocating screw is rotatably mounted on the floating plate. The reciprocating screw is threadedly connected to one end of the tube scraper plate. When the reciprocating screw descends to the lowest height, the reciprocating screw is driven by the catalytic tube to rotate. A wire mesh demister is installed above the water tank.

2. A flue gas denitrification device according to claim 1, characterized in that: A smoke barrier tube is fixedly installed on the lower surface of the filter screen, and the lower end of the smoke barrier tube is slidably sealed with the top of the condensation tank. A guide tube is arranged between the smoke barrier tube and the catalytic tube, and the upper end of the guide tube is fixedly connected to the lower surface of the water tank, and the lower end of the guide tube is close to the bottom of the smoke barrier tube, and a spoiler is fixedly installed on the inner side of the smoke barrier tube.

3. A flue gas denitrification device according to claim 2, characterized in that: An annular nozzle is fixedly installed on the lower surface of the water tank, an atomizing nozzle is arranged on the lower surface of the annular nozzle, and the interior of the annular nozzle is connected with one end of the ammonia inlet pipe, and the annular nozzle is arranged between the smoke barrier pipe and the guide pipe.

4. A flue gas denitrification device according to claim 2, characterized in that: The filter cleaning assembly also includes a rotating shaft and a water pump, a connecting block is rotatably installed at the lower end of the rotating shaft, the connecting block is fixedly connected to an inner wall of one side of the tank body, the scraper plate is fixedly installed at the upper end of the rotating shaft, the outer sides of the rotating shaft and the smoke shielding pipe are fixedly installed with transmission gears, the transmission gears are meshingly connected, the water pump is fixedly installed at the bottom of the tank body, the suction end of the water pump passes through the bottom wall of the tank body and extends to the interior of the condensation pool, and the delivery end of the water pump is connected to the interior of the return water nozzle, the scraper plate is arranged below the filter, the return water nozzle is arranged above the filter, and the scraper plate and the return water nozzle are arranged relative to each other.

5. The flue gas denitrification equipment according to claim 2, characterized in that: The tube wall cleaning assembly also includes a movable bevel gear and a fixed bevel gear. The movable bevel gear is fixedly mounted on the upper end of the reciprocating screw, and the fixed bevel gear is fixedly mounted on the outer surface of the catalytic tube. The movable bevel gear and the fixed bevel gear are adaptively meshed. A connecting seat is fixedly mounted on the upper and lower sides of the inner side surface of the guide tube, and a rotating block is rotatably mounted on the connecting seat. The reciprocating screw is slidably connected to the rotating block.

6. A flue gas denitrification device according to claim 5, characterized in that: A slide seat is fixedly mounted on the inner side of the guide tube, a guide rod is slidably mounted on the slide seat, the lower end of the guide rod is fixedly connected to the floating plate, and the guide rod is slidably connected to one end of the scraper plate, and the guide rod and the reciprocating screw are symmetrically arranged on both sides of the catalytic tube.

7. A flue gas denitrification device according to claim 2, characterized in that: A recoil pipe is fixedly installed at the lower end of the catalytic tube, and the recoil pipe penetrates the bottom wall of the tank body and extends to the outside of the tank body, and a valve is provided at the lower end of the recoil pipe. A driving motor is fixedly installed at the bottom of the tank body, and the driving end of the driving motor penetrates the bottom wall of the tank body and extends to the inside of the tank body. Driving gears are fixedly installed on the driving end of the driving motor and the outer side surface of the smoke barrier pipe, and the driving gears are meshingly connected. Transmission wheels are fixedly installed on the driving end of the driving motor and the outer side surface of the recoil pipe, and the transmission wheels are connected through a transmission belt.

8. A flue gas denitration device according to claim 7, characterized in that: A one-way valve is provided on the smoke-spraying pipe, and a rotating pipe is rotatably installed at one end of the smoke-spraying pipe, a smoke-spraying hole is opened on the rotating pipe, and a driven gear is fixedly installed on the rotating pipe. A cross bar is fixedly installed between the inner walls of the water tank, and a toothed disc is fixedly installed at the lower end of the cross bar, and the lower surface of the toothed disc is meshed and connected with the driven gear.

9. A flue gas denitrification device according to claim 4, characterized in that: The tank body is provided with a branch pipe and a drain pipe, the two ends of the branch pipe are respectively connected to the delivery end of the water pump and the water inlet end of the return water nozzle, and the other end of the branch pipe extends to the interior of the water tank. The drain pipe is connected to the inner bottom of the tank body, and the drain pipe is arranged on the outside of the condensation tank. A valve is provided on the drain pipe.

10. A denitration method for treating furnace flue gas, using a flue gas denitration device as claimed in any one of claims 1 to 9, characterized in that: The specific steps are: Connect the smoke inlet pipe to the smoke outlet pipe of the furnace, and connect the ammonia inlet pipe to the infusion container pipeline storing ammonia water; After the flue gas enters the tank, it is filtered through the filter screen to filter out the mixed large particles of impurities, and then mixed with the ammonia decomposed in the ammonia water and enters the catalytic tube. When passing through the catalytic tube, it is catalyzed by the catalyst material on the catalytic tube, so that the nitrogen oxides and ammonia react quickly to generate nitrogen and water. The nitrogen is discharged into the water tank through the smoke injection pipe on the top of the catalytic tube. After leaving the water in the water tank, it passes through the wire mesh demister to filter out the moisture in the flue gas and then is discharged from the tank through the exhaust pipe; After the flue gas denitrification equipment has been working for a period of time, the cleaning mechanism is started to transport the water collected in the condensation pool to the return water nozzle to flush the filter and the scraper plate. When the water level in the condensation pool drops to a certain level, the reciprocating screw is driven by the catalytic tube to rotate, causing the scraper plate to slide up and down on the outer side of the catalytic tube to scrape off impurities adhering to the surface of the catalytic tube.

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