Efficient denitrification device for ship tail gas

Abstract

The invention discloses an efficient denitrification device for ship tail gas, which is applied to the technical field of clean production, and is characterized in that the efficient denitrification device comprises a tail gas treatment box and a gas inlet pipe communicated with the tail gas treatment box, the gas inlet pipe is provided with a gas extractor, and the inner wall of the tail gas treatment box is connected with a second rotating shaft and a third rotating shaft through driving parts; an exhaust hole is formed in the inner top wall of the tail gas treatment box, an exhaust fan is installed in the exhaust hole and connected with the second rotating shaft, a plurality of stirring rods are arranged on the third rotating shaft in the height direction, a liquid inlet for a flocculating agent and a disinfectant to be poured in is formed in the top of the tail gas treatment box, and a dust falling assembly for dust falling of tail gas is arranged on the tail gas treatment box. The tail gas treatment box is communicated with a drainage pipe; the tail gas treatment device has the technical effects that large particles and toxic substances in tail gas are treated, the treated tail gas is subjected to dust falling through the dust falling assembly, the tail gas is subjected to denitrification treatment through the first denitrification assembly and the second denitrification assembly, and the denitrification effect of the tail gas is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ship exhaust emission reduction devices, and in particular to a high-efficiency denitrification device for ship exhaust. Background Art

[0002] With the rapid increase in the number of transport ships, the pollution and harm caused by ship emissions to the atmospheric and marine environments are becoming increasingly serious. The exhaust gas emitted by ship diesel engines is mainly composed of sulfur dioxide SO2 and nitrogen oxides NO2. According to the statistics of the International Maritime Organization, the annual exhaust emissions of SO2 and NO2 from ships account for about 13% and 15% of the global total emissions respectively. The relevant report also pointed out that the atmospheric pollution caused by exhaust gas from ships accounts for about 5% to 11% of the total atmospheric pollution. In order to reduce the impact of sulfur oxides SO2, nitrogen oxides NO2 and particulate matter in ship exhaust gas on the atmospheric environment, the most direct way is to reduce the sulfur and nitrogen content in ship fuel oil. The International Maritime Organization and developed countries in Europe and the United States have formulated relevant regulations to set limit values ​​for the sulfur and nitrogen content in marine fuel oil and implement them.

[0003] China Patent Publication No. CN111330446B discloses a novel ship exhaust gas treatment system, which has an air compression system and a soot blowing device. The air compression system is connected to the exhaust gas mixer, the exhaust gas mixer is connected to the SCR reactor, the soot blowing device is connected to the SCR reactor, the exhaust gas discharged by the fuel main engine enters the exhaust gas mixer, and the exhaust gas mixer is connected to an ammonia delivery system. The ammonia delivery system is equipped with a liquid ammonia fuel storage tank and an ammonia liquefaction device. A liquid ammonia low-pressure pump is provided in the liquid ammonia fuel storage tank. Liquid ammonia is pumped out by the liquid ammonia low-pressure pump and finally enters the exhaust gas mixer. The present invention makes full use of the volatile gas in the liquid ammonia fuel storage tank, is preferentially applied to the denitrification treatment of the exhaust gas of the ammonia fuel main engine, and is equipped with an ammonia liquefaction device as a supplementary means for the treatment of ammonia volatile gas, which can realize the full treatment of the volatile gas in the liquid ammonia storage tank, avoid the continuous accumulation of ammonia volatile gas leading to the pressure rise and structural damage of the liquid ammonia storage tank, avoid the large-scale discharge of ammonia volatile gas to the atmosphere, and ensure the safety of the liquid ammonia storage tank and the ship.

[0004] Regarding the above-mentioned related technologies, the inventors believe that the device only absorbs impurities in the exhaust gas through the filter and activated carbon, and cannot effectively treat the particles and toxic substances in the ship's exhaust gas, thereby affecting the denitrification effect of the exhaust gas. Summary of the invention

[0005] The purpose of the present invention is to provide a high-efficiency denitrification device for ship exhaust gas, which has the advantages of: treating large particles and toxic substances in the exhaust gas, removing dust from the treated exhaust gas through a dust reduction component, and denitrifying the exhaust gas through a first denitrification component and a second denitrification component, thereby improving the denitrification effect of the exhaust gas.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a high-efficiency denitrification device for ship exhaust gas, comprising an exhaust gas treatment box and an air intake pipe connected to the exhaust gas treatment box, the air intake pipe is equipped with an exhaust fan, the inner wall of the exhaust gas treatment box is connected to the second rotating shaft and the third rotating shaft through a driving member, an exhaust hole is provided on the top wall of the exhaust gas treatment box, an exhaust fan is installed in the exhaust hole, the exhaust fan is connected to the second rotating shaft, the third rotating shaft is provided with a plurality of stirring rods along the height direction, a liquid inlet for pouring flocculant and disinfectant is provided on the top of the exhaust gas treatment box, and a dust reduction component for reducing dust on the exhaust gas is provided on the exhaust gas treatment box, a drain pipe is connected to the exhaust gas treatment box, the exhaust gas treatment box is connected to a reactor, a first denitrification component is provided on the reactor, the end of the reactor away from the exhaust gas treatment box is connected to the denitrification treatment box, and a second denitrification component is provided in the denitrification treatment box.

[0007] Through the above technical scheme, when it is necessary to treat the exhaust gas, the exhaust gas is pumped into the exhaust gas treatment box through the vacuum pump, and the flocculant and disinfectant are poured into the liquid inlet. The third shaft is driven to rotate by the driving member, and the third shaft drives the stirring rod to stir the disinfectant, so that the disinfectant, flocculant and exhaust gas are fully mixed, thereby better treating the large particles and toxic substances in the exhaust gas. The treated exhaust gas is dusted by the dust reduction component, and the driving member drives the exhaust fan to rotate, so that the treated exhaust gas is conveniently and quickly discharged to the outside, and the exhaust gas is denitrified by the first denitrification component and the second denitrification component, thereby improving the denitrification effect of the exhaust gas.

[0008] The present invention is further configured as follows: the driving member includes an electric motor installed on the inner wall of the exhaust gas treatment box, a first rotating shaft coaxially connected to the output end of the electric motor, a first bevel gear fixedly connected to the end of the first rotating shaft, and a second bevel gear and a third bevel gear respectively meshingly connected to the first bevel gear, the second bevel gear is connected to the second rotating shaft, and the third bevel gear is connected to the third rotating shaft.

[0009] The present invention is further configured as follows: the dust reduction component includes a water storage tank installed on the exhaust gas treatment box, a water pumping pipe is connected between the water storage tank and the exhaust gas treatment box, a water pump is fixedly connected to the water pumping pipe, water injection pipes are installed on both inner walls of the exhaust gas treatment box near the top side, the water pumping pipe is connected to the water injection pipe, and a plurality of nozzles are connected to the bottom of the water injection pipe.

[0010] The present invention is further configured as follows: a filter assembly is connected to the drain pipe via a threaded pipe, and an external thread that is threadedly connected to the threaded pipe is provided on the drain pipe.

[0011] The present invention is further configured as follows: the filter assembly includes a filter ring connected to the threaded tube, the filter ring is made of transparent material, a filter net is connected to the inner wall of the filter ring near the water outlet, and a storage groove is provided on the filter ring near the filter net.

[0012] The present invention is further configured as follows: a water guide cover is installed on the tail gas treatment box along the periphery of the outer side of the liquid inlet.

[0013] The present invention is further configured as follows: the first denitrification component includes a flow meter installed at the inlet of the reactor, an ammonia sprayer is provided at the outlet of the reactor, and an electron beam generator is fixedly connected to a side of the reactor away from the ammonia sprayer.

[0014] The present invention is further configured as follows: the second denitrification component includes a stirring motor arranged on the top side of the denitrification treatment box, the output end of the stirring motor is coaxially connected to a stirring shaft, the stirring shaft is symmetrically connected to a plurality of stirring blades along the height direction, a dosing port is opened on the top side of the denitrification treatment box, and an air outlet pipe is connected to the outside of the denitrification treatment box.

[0015] In summary, the present invention has the following beneficial effects: when the exhaust gas needs to be treated, the exhaust gas is pumped into the exhaust gas treatment box by the vacuum pump, the flocculant and the disinfectant are poured into the liquid inlet, the third shaft is driven to rotate by the driving member, and the third shaft drives the stirring rod to stir the disinfectant, so that the disinfectant, the flocculant and the exhaust gas are fully mixed, thereby better treating the large particles and toxic substances in the exhaust gas, the treated exhaust gas is dusted by the dust reduction component, and the driving member drives the exhaust fan to rotate, and the treated exhaust gas is conveniently and quickly input into the reactor for deamination treatment, and the exhaust gas after preliminary deamination is denitrified by the first denitrification component and the second denitrification component, thereby improving the denitrification effect of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of this embodiment; Figure 2 Schematic diagram of the module connection structure of this embodiment; Figure 3 is a side view of this embodiment; Figure 4 Schematic diagram of the internal structure of the deammoniation treatment box of this embodiment; Figure 5 Schematic diagram of the internal structure of the tail gas treatment box of this embodiment; Figure 6 yes Figure 5 Enlarged view of part A in the middle.

[0017] 1. Exhaust treatment box; 2. Air inlet; 3. Air pump; 4. Liquid inlet; 5. Water guide cover; 6. Electric motor; 7. First rotating shaft; 8. First bevel gear; 9. Second bevel gear; 10. Third bevel gear; 11. Second rotating shaft; 12. Third rotating shaft; 13. Stirring rod; 14. Exhaust hole; 15. Exhaust fan; 16. Water storage tank; 17. Suction pipe; 18. Suction pump; 19. Water injection pipe; 20. Nozzle; 21. Drain pipe; 22. Threaded pipe; 23. Filter ring; 24. Filter net; 25. Storage tank; 26. Reactor; 27. Flow meter; 28. Ammonia sprayer; 29. ​​Electron beam generator; 30. Denitrification treatment box; 31. Dosing port; 32. Stirring motor; 33. Stirring shaft; 34. Stirring blade; 35. Air outlet pipe. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0019] Example: Refer to Figure 1-6 As shown, a highly efficient denitrification device for ship exhaust gas comprises an exhaust gas treatment box 1 and an air intake pipe 2 connected to the exhaust gas treatment box 1, an exhaust fan 3 is installed on the air intake pipe 2, the inner wall of the exhaust gas treatment box 1 is connected to a second rotating shaft 11 and a third rotating shaft 12 through a driving member, an exhaust hole 14 is provided on the top wall of the exhaust gas treatment box 1, an exhaust fan 15 is installed in the exhaust hole 14, the exhaust fan 15 is connected to the second rotating shaft 11, and the third rotating shaft 12 is fixedly connected to a plurality of stirring rods 13 along the height direction, a liquid inlet 4 for pouring flocculants and disinfectants is provided on the top of the exhaust gas treatment box 1, and a dust reduction component for dust reduction of exhaust gas is provided on the exhaust gas treatment box 1, and the exhaust gas treatment box 1 is connected to A drain pipe 21 is connected, and the driving member includes a motor 6 installed on the inner wall of the exhaust gas treatment box 1, a first rotating shaft 7 coaxially fixedly connected to the output end of the motor 6, a first bevel gear 8 fixedly connected to the end of the first rotating shaft 7, and a second bevel gear 9 and a third bevel gear 10 respectively meshed and connected to the first bevel gear 8, the second bevel gear 9 is connected to the second rotating shaft 11, and the third bevel gear 10 is connected to the third rotating shaft 12. The exhaust gas treatment box 1 is connected to a reactor 26, and a first denitrification component is arranged on the reactor 26. The end of the reactor 26 away from the exhaust gas treatment box 1 is connected to a denitrification treatment box 30, and a second denitrification component is arranged in the denitrification treatment box 30; Specifically, when it is necessary to treat the exhaust gas of the ship, the vacuum pump 3 is driven to draw the exhaust gas into the exhaust gas treatment box through the air intake pipe 2, and a large amount of disinfectant and flocculant are poured in through the liquid inlet 4. The disinfectant floods the stirring rod 13. At this time, the driving motor 6 drives the first shaft 7 to rotate, and the first shaft 7 drives the first bevel gear 8 to rotate. The first bevel gear 8 drives the second bevel gear 9 and the third bevel gear 10 to rotate respectively, and then drives the second shaft 11 and the third shaft 12 to rotate. The third shaft 12 drives the stirring rod 13 to rotate. The stirring rod 13 allows the disinfectant, flocculant and exhaust gas to be more fully contacted and mixed, thereby better adsorbing large particles in the exhaust gas and disinfecting toxic substances. The second shaft 11 drives the exhaust fan 15 to rotate, and the exhaust fan 15 discharges the treated exhaust gas to the outside.

[0020] Furthermore, the dust reduction component includes a water storage tank 16 installed on the exhaust gas treatment box 1, a water suction pipe 17 is connected between the water storage tank 16 and the exhaust gas treatment box 1, a water suction pipe 17 is fixedly connected to a water pump 18, and water injection pipes 19 are installed on both inner walls of the exhaust gas treatment box 1 near the top side, the water suction pipe 17 is connected to the water injection pipe 19, and a plurality of nozzles 20 are connected to the bottom of the water injection pipe 19.

[0021] Furthermore, the dust reduction component includes a water tank 16 installed on the exhaust gas treatment box 1, and a water suction pipe 17 is connected between the water tank 16 and the exhaust gas treatment box 1, and a water suction pump 18 is fixedly connected to the water suction pipe 17. Water injection pipes 19 are installed on the two inner walls of the exhaust gas treatment box 1 near the top side, and the water suction pipe 17 is connected to the water injection pipe 19, and a plurality of nozzles 20 are connected to the bottom of the water injection pipe 19. When it is necessary to reduce dust on the exhaust gas, the water suction pump 18 is driven to pump water in the water tank 16 into the water injection pipe 19 through the water suction pipe 17, and the exhaust gas is sprayed with water through the nozzle 20, so that the exhaust gas is treated for dust reduction, and the dust in the exhaust gas is settled.

[0022] Furthermore, a filter assembly is connected to the drain pipe 21 through a threaded pipe 22. The drain pipe 21 is provided with an external thread that is threadedly connected to the threaded pipe 22. The filter assembly includes a filter ring 23 connected to the threaded pipe 22. The filter ring 23 is made of a transparent material. A filter screen 24 is connected to the inner wall of the filter ring 23 near the water outlet. A storage groove 25 is provided on the filter ring 23 near the filter screen 24. The treated waste liquid flows out to the outside through the drain pipe 21. The filter screen 24 filters impurities in the waste liquid. The storage groove 25 has a storage function for impurities. The filter ring 23 is made of a transparent material, which is convenient for personnel to better observe the situation in the filter ring 23. When the storage groove 25 is full of impurities, the filter ring 23 can be conveniently and quickly removed by rotating the threaded pipe 22 to pour out the impurities.

[0023] Furthermore, a water guide cover 5 is installed on the tail gas treatment box 1 along the periphery of the outer side of the liquid inlet 4 , and the water guide cover 5 facilitates the disinfectant and flocculant to be better introduced into the tail gas treatment box 1 .

[0024] Furthermore, the first denitrification component includes a flow meter 27 installed at the inlet of the reactor 26 , an ammonia sprayer 28 is provided at the outlet of the reactor 26 , and an electron beam generator 29 is fixedly connected to the side of the reactor 26 away from the ammonia sprayer 28 .

[0025] Furthermore, the second denitrification component includes a stirring motor 32 arranged on the top side of the denitrification treatment box 30, the output end of the stirring motor 32 is coaxially connected to the stirring shaft 33, the stirring shaft 33 is symmetrically connected to a plurality of stirring blades 34 along the height direction, a dosing port 31 is opened on the top side of the denitrification treatment box 30, and an outlet pipe 35 is connected to the outside of the denitrification treatment box 30. When the exhaust gas enters the denitrification treatment box 30, the denitrification liquid is poured into the dosing port 31, the stirring motor 32 is driven to drive the stirring shaft 33 to rotate, and then the stirring shaft 33 drives the stirring blades 34 to rotate, and the stirring blades 34 drive the exhaust gas and the denitrification liquid to mix evenly, so that the exhaust gas denitrification effect is better, and the denitrified exhaust gas is discharged through the outlet pipe 35.

[0026] Operation steps: When it is necessary to treat the exhaust gas of the ship, drive the exhaust fan 3 to draw the exhaust gas into the exhaust gas treatment box through the intake pipe 2, pour a large amount of disinfectant and flocculant through the liquid inlet 4, and the disinfectant floods the stirring rod 13. At this time, the driving motor 6 drives the first shaft 7 to rotate, the first shaft 7 drives the first bevel gear 8 to rotate, the first bevel gear 8 drives the second bevel gear 9 and the third bevel gear 10 to rotate, and then drives the second shaft 11 and the third shaft 12 to rotate, the third shaft 12 drives the stirring rod 13 to rotate, and the stirring rod 13 makes the disinfectant, flocculant and The tail gas is more fully contacted and mixed, so that large particles in the tail gas and toxic substances are better adsorbed and disinfected. The second rotating shaft 11 drives the exhaust fan 15 to rotate, and the exhaust fan 15 inputs the treated tail gas into the reactor for deamination treatment. After preliminary deamination, the tail gas enters the denitrification treatment box 30, and the denitrification liquid is poured into the dosing port 31. The stirring motor 32 is driven to drive the stirring shaft 33 to rotate, and then the stirring shaft 33 drives the stirring blade 34 to rotate. The stirring blade 34 drives the tail gas and the denitrification liquid to mix evenly, so that the tail gas denitrification effect is better, and the tail gas after denitrification is discharged through the outlet pipe 35.

[0027] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A highly efficient denitrification device for ship exhaust gas, comprising an exhaust gas treatment box (1) and an air intake pipe (2) connected to the exhaust gas treatment box (1), wherein an air exhauster (3) is installed on the air intake pipe (2), characterized in that: The inner wall of the exhaust gas treatment box (1) is connected to a second rotating shaft (11) and a third rotating shaft (12) through a driving member. An exhaust hole (14) is provided on the inner top wall of the exhaust gas treatment box (1). An exhaust fan (15) is installed in the exhaust hole (14). The exhaust fan (15) is connected to the second rotating shaft (11). The third rotating shaft (12) is provided with a plurality of stirring rods (13) along the height direction. A supplying section for flocculant, A liquid inlet (4) for pouring disinfectant into the exhaust gas treatment box (1) is provided with a dust reduction component for reducing dust on the exhaust gas, the exhaust gas treatment box (1) is connected to a drain pipe (21), the exhaust gas treatment box (1) is connected to a reactor (26), a first denitrification component is provided on the reactor (26), and one end of the reactor (26) away from the exhaust gas treatment box (1) is connected to a denitrification treatment box (30), and a second denitrification component is provided in the denitrification treatment box (30).

2. The highly efficient denitrification device for ship exhaust gas according to claim 1, characterized in that: The driving member comprises an electric motor (6) mounted on the inner wall of the exhaust gas treatment box (1), a first rotating shaft (7) coaxially connected to the output end of the electric motor (6), a first bevel gear (8) fixedly connected to the end of the first rotating shaft (7), and a second bevel gear (9) and a third bevel gear (10) respectively meshingly connected to the first bevel gear (8), the second bevel gear (9) being connected to the second rotating shaft (11), and the third bevel gear (10) being connected to the third rotating shaft (12).

3. The high-efficiency denitrification device for ship exhaust gas according to claim 1 is characterized in that: The dust reduction component comprises a water storage tank (16) installed on the exhaust gas treatment box (1), a water extraction pipe (17) is connected between the water storage tank (16) and the exhaust gas treatment box (1), a water extraction pump (18) is fixedly connected to the water extraction pipe (17), water injection pipes (19) are installed on the two inner walls of the exhaust gas treatment box (1) near the top side, the water extraction pipe (17) is connected to the water injection pipe (19), and a plurality of nozzles (20) are connected to the bottom of the water injection pipe (19).

4. The high-efficiency denitrification device for ship exhaust gas according to claim 1 is characterized in that: The drainage pipe (21) is connected to a filter assembly via a threaded pipe (22), and the drainage pipe (21) is provided with an external thread that is threadedly connected to the threaded pipe (22).

5. The high-efficiency denitrification device for ship exhaust gas according to claim 4 is characterized in that: The filter assembly comprises a filter ring (23) connected to a threaded tube (22); the filter ring (23) is made of a transparent material; a filter screen (24) is connected to the inner wall of the filter ring (23) near the water outlet; and a storage groove (25) is provided on the filter ring (23) near the filter screen (24).

6. The high-efficiency denitrification device for ship exhaust gas according to claim 1 is characterized in that: A water guide cover (5) is installed on the tail gas treatment box (1) along the outer side of the liquid inlet (4).

7. The high-efficiency denitrification device for ship exhaust gas according to claim 1 is characterized in that: The first denitrification component comprises a flow meter (27) installed at the inlet of the reactor (26), an ammonia sprayer (28) is provided at the outlet of the reactor (26), and an electron beam generator (29) is fixedly connected to the side of the reactor (26) away from the ammonia sprayer (28).

8. The high-efficiency denitrification device for ship exhaust gas according to claim 1 is characterized in that: The second denitrification component comprises a stirring motor (32) arranged on the top side of the denitrification treatment box (30), the output end of the stirring motor (32) is coaxially connected to a stirring shaft (33), and the stirring shaft (33) is symmetrically connected to a plurality of stirring blades (34) along the height direction. The top side of the denitrification treatment box (30) is provided with a dosing port (31), and the outside of the denitrification treatment box (30) is connected to an air outlet pipe (35).

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