Ultralow-temperature SCR (Selective Catalytic Reduction) denitration device for industrial smoke
By designing an ultra-low temperature SCR denitrification device for industrial flue gas including ammonia tank, ash removal box and ammonia spray grille, the accumulation problem when dealing with dust-containing flue gas is solved, and a more efficient denitrification effect is achieved.
Patent Information
- Application Number
- CN202421259677.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-06-04
AI Technical Summary
When dealing with dust-containing industrial flue gas, common ultra-low temperature SCR denitrification devices fail to effectively solve the contact between N2 and H2O produced by the reaction of nitrogen oxides in the flue gas and ammonia, resulting in accumulation.
An industrial flue gas ultra-low temperature SCR denitrification device was designed, including an ammonia gas tank, an electric heating evaporator, a pressure sensor and a pressure display screen, ash removal box and ash removal board, a first ammonia spray grille and a second ammonia spray grille . The release of ammonia is controlled by electric heating evaporator, dust is adsorbed by ash removal plate, and the ammonia spray grid cross-set to increase the reaction time to achieve more efficient denitrification.
Effectively monitor and regulate the release of ammonia, absorb dust by ash removal board, increase the contact time between flue gas and ammonia, improve the denitrification efficiency, and avoid dust accumulation.
Smart Images
Figure CN222468590U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of industrial technology, in particular to an ultra-low temperature SCR denitration device for industrial flue gas. Background Art
[0002] Ultra-low temperature SCR denitrification technology for industrial flue gas is a technology that achieves efficient NOx removal at a lower temperature. Compared with traditional high-temperature SCR technology, ultra-low temperature SCR denitrification technology has significant advantages. First, ultra-low temperature SCR denitrification technology can operate at a low temperature below 300°C, which greatly reduces energy consumption and equipment costs. For low flue gas temperature (≤200°C), a heating furnace system is required to heat the flue gas, which consumes a large amount of fuel gas. In order to reduce fuel use and reduce operation and maintenance costs, ultra-low temperature SCR denitrification technology is developed. At the same time, since this technology has a small demand for ammonia water, it also reduces operating costs. In addition, ultra-low temperature SCR denitrification technology can use cheap catalysts, which further reduces equipment costs. The principle of ultra-low temperature SCR denitrification technology is to reduce NOx emissions by injecting a reducing agent (such as ammonia water) during the combustion process. In this process, the denitrification catalyst will promote the reaction of ammonia water and NOx, converting NOx into nitrogen and water vapor, thereby achieving the purpose of denitrification.
[0003] However, when common ultra-low temperature SCR denitrification devices are used to denitrify industrial flue gas, they do not take into account the dust in the industrial flue gas. Direct denitrification treatment will cause the nitrogen oxides in the flue gas to react with ammonia to produce N2 and H20, which will come into contact with the dust in the flue gas and easily accumulate.
[0004] Therefore, we propose an ultra-low temperature SCR denitrification device for industrial flue gas to solve the above-mentioned problems. Utility Model Content
[0005] The purpose of the utility model is to provide an ultra-low temperature SCR denitrification device for industrial flue gas, so as to solve the problem that the currently common ultra-low temperature SCR denitrification device, when denitrifying the industrial flue gas transported, does not take into account the dust contained in the industrial flue gas, and directly denitrifies the nitrogen oxides in the flue gas and reacts chemically with ammonia to produce N2 and H2O, which come into contact with the dust in the flue gas and are prone to accumulation.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an industrial flue gas ultra-low temperature SCR denitrification device, comprising: a bottom plate and an ammonia tank fixedly mounted on the upper side of the bottom plate;
[0007] Also includes:
[0008] A control mechanism is provided inside the ammonia tank, wherein the mechanism includes an electric heating evaporator, a pressure sensor and a pressure display screen, wherein the electric heating evaporator is provided at the lower side of the inside of the ammonia tank, and the pressure sensor is fixedly installed inside the ammonia tank;
[0009] A dust removal box is provided with a dust removal mechanism inside the dust removal box, wherein the dust removal mechanism comprises a dust removal plate, a limit block and a pull rope, the dust removal plate is fixedly installed on the inner side of the dust removal box, and the dust removal plates are cross-arranged.
[0010] Preferably, a pressure display screen is fixedly installed on the front side of the ammonia tank, and a controller is fixedly installed on the front side of the ammonia tank.
[0011] Preferably, the dust removal box is arranged in a mounting frame above the bottom plate, a horizontal plate is fixedly installed on the lower inner side of the dust removal box, and a pull rope is arranged inside the dust removal box.
[0012] Preferably, the lower end of the pull rope is fixedly connected to a limiting plate, a spring is provided between the limiting plate and the transverse plate, and the left end of the pull rope is fixedly connected to a draw buckle.
[0013] Preferably, the pull buckle is arranged on the outside of the dust removal box, and a plurality of limit blocks are fixedly connected to the outside of the pull rope, and the upper side of the limit block is tightly fitted with the lower side of the dust removal plate, and the limit block corresponds to the dust removal plate one by one.
[0014] Preferably, a denitration box is fixedly connected to the upper side of the bottom plate, a first ammonia injection grid is fixedly connected to the inner upper side of the denitration box, and a second ammonia injection grid is fixedly connected to the inner lower side of the first ammonia injection grid.
[0015] Preferably, the first ammonia injection grid and the second ammonia injection grid are cross-arranged, a water outlet is provided on the lower inner side of the second ammonia injection grid, and an ammonia-air mixer is provided on the upper side of the denitrification box.
[0016] Compared with the prior art, the utility model has the following beneficial effects: the industrial flue gas ultra-low temperature SCR denitration device, the pressure sensor and the pressure display monitor the pressure in the ammonia tank, thereby adjusting the operation and stop of the electric heating evaporator, the flue gas is transported upward in an "S" shape in the ash removal box, and the lower side of the ash removal plate can absorb the dust in the flue gas, thereby achieving the purpose of ash removal, and the diluted ammonia and flue gas are catalytically reacted through the first ammonia spraying grid and the second ammonia spraying grid, which increases the reaction time of the flue gas and makes the denitration effect better;
[0017] 1. An electric heating evaporator, a pressure sensor and a pressure display are provided. The electric heating evaporator is used to heat the ammonia water stored in the ammonia tank to vaporize it. Then, the pressure in the ammonia tank is monitored by the pressure sensor and the pressure display, so as to adjust the operation and stop of the electric heating evaporator.
[0018] 2. A dust removal plate, a limit block and a pull rope are provided. The smoke is transported into the dust removal box and is transported upward in an "S" shape at the lower side of the dust removal plate. The lower side of the dust removal plate can absorb the dust in the smoke, thereby achieving the purpose of dust removal;
[0019] 3. A first ammonia spraying grid, a second ammonia spraying grid and a water outlet are provided. The diluted ammonia and flue gas will produce N2 and H2O through the catalytic reaction of the first ammonia spraying grid and the second ammonia spraying grid. The first ammonia spraying grid and the second ammonia spraying grid are cross-arranged to increase the reaction time of the flue gas and make the denitrification effect better. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the front view cutaway structure of the utility model;
[0021] Figure 2 It is a side view cutaway structural schematic diagram of the utility model;
[0022] Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle;
[0023] Figure 4 For this utility model Figure 2 The enlarged structural diagram at B in the middle;
[0024] Figure 5 This is a front view structural schematic diagram of the utility model.
[0025] In the figure: 1. bottom plate; 2. ammonia tank; 3. electric heating evaporator; 4. pressure sensor; 5. pressure display screen; 6. controller; 7. dust removal box; 8. dust removal plate; 9. limit block; 10. horizontal plate; 11. pull rope; 12. spring; 13. buckle; 14. denitrification box; 15. first ammonia spraying grid; 16. second ammonia spraying grid; 17. water outlet; 18. ammonia air mixer. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] See also Figure 1-5The utility model provides a technical solution: an industrial flue gas ultra-low temperature SCR denitrification device, including: a bottom plate 1, an ammonia tank 2, an electric heating evaporator 3, a pressure sensor 4, a pressure display screen 5, a controller 6, an ash removal box 7, an ash removal plate 8, a limit block 9, a horizontal plate 10, a pull rope 11, a spring 12, a buckle 13, a denitrification box 14, a first ammonia spraying grid 15, a second ammonia spraying grid 16, a water outlet 17 and an ammonia air mixer 18;
[0028] When using the industrial flue gas ultra-low temperature SCR denitrification device, Figure 1 and Figure 2 As shown, an ammonia tank 2 and a denitration box 14 are arranged on the upper side of the bottom plate 1. The electric heating evaporator 3 in the ammonia tank 2 is started, and the electric heating evaporator 3 will heat the ammonia water stored in the ammonia tank 2. The ammonia water will produce ammonia after heating. In addition, a pressure sensor 4 is arranged inside the ammonia tank 2. The pressure sensor 4 can monitor the pressure in the ammonia tank 2 and transmit the pressure to the pressure display screen 5. The pressure display screen 5 will display the real-time situation of the pressure in the ammonia tank 2 and transmit the signal to the controller 6, so that the controller 6 controls the start and stop of the electric heating evaporator 3. When the pressure in the ammonia tank 2 is small, the electric heating evaporator 3 continues to work to make the ammonia water in the ammonia tank 2 continue to vaporize. When the pressure in the ammonia tank 2 is small, the electric heating evaporator 3 continues to work to make the ammonia water in the ammonia tank 2 continue to vaporize, so as to achieve the purpose of continuously outputting ammonia, and will not cause the ammonia tank 2 to have the danger of explosion.
[0029] like Figure 1 and Figure 2 As shown, the industrial flue gas is transported from the pipeline on the lower side of the ash removal box 7 to the ash removal box 7. The ash removal plate 8 and the cross plate 10 are arranged inside the ash removal box 7. The ash removal plates 8 are arranged crosswise. After the flue gas is transported to the lower side of the ash removal plate 8 inside the ash removal box 7, the flue gas will be transported upward from the lower ash removal plate 8 in sequence. After passing through the lower side of each ash removal plate 8, the dust contained in the flue gas will be adsorbed on the lower side of the ash removal plate 8, and then it will be transported to the inside of the denitrification box 14, thereby achieving the purpose of dust removal.
[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4When the dust on the lower side of the dust removal plate 8 needs to be removed, the smoke delivery is stopped, the cover on the lower side of the dust removal box 7 is opened, and the buckle 13 is pulled. The buckle 13 will move with the pull rope 11, and a limit block 9 is arranged on the outer side of the pull rope 11, and the limit block 9 corresponds to the dust removal plate 8 one by one. When the pull rope 11 is pulled, the spring 12 will be elastically deformed by the limit piece and the cross plate 10 on the lower side of the pull rope 11, and the limit block 9 will also push the dust removal plate 8 to move upward, so that the dust removal plate 8 is deformed and the buckle 13 is released. The dust removal plate 8 will return to its original state, and the spring 12 will also restore its elastic deformation. Repeat this process many times, and the dust adsorbed on the lower side of the dust removal plate 8 will fall off, and then be discharged from the lower side of the dust removal box 7, which is conducive to the maximum dust removal.
[0031] like Figure 1 and Figure 5 As shown, when the flue gas is being transported, the ammonia-air mixer 18 is started, and the ammonia-air mixer 18 will dilute the ammonia. The concentration of the diluted ammonia will become lower, and then it will contact and mix with the nitrogen oxides in the flue gas. In addition, the first ammonia spraying grid 15 and the second ammonia spraying grid 16 are cross-arranged inside the denitrification box 14, which increases the contact area between the gas and the first ammonia spraying grid 15 and the second ammonia spraying grid 16, which is beneficial to the mixed catalytic reaction of the flue gas and ammonia. In the catalytic process, the catalyst is a key part of the SCR technology, and materials such as titanium dioxide and vanadium oxide are usually used. The denitrification catalyst will promote the reaction of ammonia water and nitrogen oxides, reduce the nitrogen oxides, generate nitrates and water, and then the clean flue gas will be discharged from the exhaust hole on the right side of the denitrification box 14. In addition, a water outlet 17 is provided on the lower side of the second ammonia spraying grid 16, and the water will remain in the denitrification box 14. When drainage is required, the valve on the right side of the bottom plate 1 is opened to discharge the water.
[0032] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. The standard parts used in the utility model can be purchased from the market, and special-shaped parts can be customized according to the records in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.
[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. An ultra-low temperature SCR denitrification device for industrial flue gas, comprising: A base plate (1) and an ammonia tank (2) fixedly mounted on the upper side of the base plate (1); It is characterized by further comprising: A control mechanism is arranged inside the ammonia tank (2), wherein the mechanism comprises an electric heating evaporator (3), a pressure sensor (4) and a pressure display screen (5), wherein the electric heating evaporator (3) is arranged on the lower side of the interior of the ammonia tank (2), and the pressure sensor (4) is fixedly installed inside the ammonia tank (2); A dust removal box (7), wherein a dust removal mechanism is arranged inside the dust removal box (7), wherein the dust removal mechanism comprises a dust removal plate (8), a limit block (9) and a pull rope (11), wherein the dust removal plate (8) is fixedly mounted on the inner side of the dust removal box (7), and the dust removal plates (8) are arranged in a cross-like manner.
2. The ultra-low temperature SCR denitration device for industrial flue gas according to claim 1 is characterized in that: A pressure display screen (5) is fixedly mounted on the front side of the ammonia tank (2), and a controller (6) is fixedly mounted on the front side of the ammonia tank (2).
3. The ultra-low temperature SCR denitration device for industrial flue gas according to claim 1 is characterized in that: The dust removal box (7) is arranged in a mounting frame above the bottom plate (1), a horizontal plate (10) is fixedly installed on the lower side of the interior of the dust removal box (7), and a pull rope (11) is arranged inside the dust removal box (7).
4. The ultra-low temperature SCR denitration device for industrial flue gas according to claim 3 is characterized in that: The lower end of the pull rope (11) is fixedly connected to a limiting plate, a spring (12) is provided between the limiting plate and the transverse plate (10), and the left end of the pull rope (11) is fixedly connected to a draw buckle (13).
5. The ultra-low temperature SCR denitration device for industrial flue gas according to claim 4 is characterized in that: The drawstring (13) is arranged on the outside of the dust removal box (7), and a plurality of limit blocks (9) are fixedly connected to the outside of the drawstring (11), and the upper side of the limit blocks (9) is tightly fitted with the lower side of the dust removal plate (8), and the limit blocks (9) correspond one to one with the dust removal plate (8).
6. The ultra-low temperature SCR denitration device for industrial flue gas according to claim 1, characterized in that: A denitration box (14) is fixedly connected to the upper side of the bottom plate (1), a first ammonia injection grid (15) is fixedly connected to the inner upper side of the denitration box (14), and a second ammonia injection grid (16) is fixedly connected to the inner lower side of the first ammonia injection grid (15).
7. The ultra-low temperature SCR denitration device for industrial flue gas according to claim 6, characterized in that: The first ammonia spraying grid (15) and the second ammonia spraying grid (16) are arranged crosswise, and a water outlet (17) is provided on the lower side of the second ammonia spraying grid (16), and an ammonia-air mixer (18) is provided on the upper side of the denitration box (14).