Anti-blocking device for SCR denitration ammonia injection grid

Abstract

The utility model discloses a kind of SCR denitration ammonia injection grid anti-blocking devices, more specifically in the flue gas denitration technical field, including L-shaped flue, dust prevention mechanism is slidably connected inside the bearing mechanism, the left side and right side symmetrically fixed connection of dust prevention mechanism front part has positioning mechanism, two the jet assembly inside are movably connected with anti-blocking mechanism.The utility model said a kind of SCR denitration ammonia injection grid anti-blocking device, bearing mechanism can be realized to dust prevention mechanism bearing and the effect of limiting, dust prevention mechanism can be filtered and intercepted with the effect of impurities such as dust, positioning mechanism can be conveniently locked with the effect of the position of dust prevention mechanism, jet assembly can be realized with the effect of ammonia gas high-speed injection into the inner cavity of L-shaped flue, under the effect of anti-blocking mechanism, impurities can be avoided to be blocked in jet assembly inside, and with the effect of shunt component, ammonia gas can be shunted and transported, improve the practicality and universality of device.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification technology, and in particular to an anti-clogging device for an SCR denitrification ammonia injection grid. Background Technology

[0002] Selective catalytic reduction (SCR) denitrification technology has advantages such as high efficiency, good selectivity, and stable and reliable operation, and has been widely used in China. The principle of SCR flue gas denitrification is that, under the action of a catalyst, ammonia-containing air is injected into the flue gas to reduce NOx to nitrogen and water, effectively avoiding secondary pollution to the environment.

[0003] The SCR denitrification ammonia injection grid is a core piece of equipment in the flue gas denitrification system of thermal power plants. It is a key component of the upstream flue gas duct of the SCR unit and is mainly used to uniformly inject ammonia into the flue gas to react with NOx in a catalytic reduction reaction to produce harmless nitrogen and water.

[0004] Chinese patent document CN108211790A discloses an SCR denitrification device and process using an ammonia injection grid. Flue gas containing nitrogen oxides from the boiler economizer outlet is fed through a connecting flue into an ammonia injection grid composed of multiple parallel ammonia injection pipes. After being thoroughly and uniformly mixed with the NOx-containing flue gas by an ammonia mixer, the mixture enters the upper gas chamber of the SCR reactor via a guide plate. The ammonia-flue gas mixture then passes through a rectifier and enters a multi-layer catalyst layer for reduction into N2 and H2O. Finally, the denitrified flue gas exiting the SCR reactor returns to the flue before the boiler air preheater, undergoes heat exchange, dust removal, and desulfurization before being discharged. This patent document not only ensures uniform ammonia injection and uniform mixing and reaction of NH3 with the flue gas, but also matches the flow rate of each ammonia nozzle to the NOx content to be reduced in the flue gas by adjusting the ammonia nozzle opening, thus preventing excessive ammonia injection in certain areas and ensuring effective denitrification.

[0005] The aforementioned patent documents can avoid excessive local ammonia injection during implementation and ensure denitrification effect. However, they cannot effectively prevent the nozzles on the ammonia injection grid from becoming clogged. As a result, after a long period of use, a large amount of impurities can easily enter the nozzles and cause blockage, which affects the ammonia injection efficiency of the ammonia injection grid. Utility Model Content

[0006] The main purpose of this invention is to provide an anti-clogging device for the SCR denitrification ammonia spray grid, which can effectively solve the problem of unavoidable clogging of the nozzles on the ammonia spray grid.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A SCR denitrification ammonia injection grid anti-clogging device includes an L-shaped flue. A supporting mechanism is fixedly connected to the left side of the middle of the inner cavity of the L-shaped flue. A dustproof mechanism is slidably connected inside the supporting mechanism. Positioning mechanisms are symmetrically fixedly connected to the left and right sides of the front of the dustproof mechanism. Air jet components are symmetrically fixedly connected to the left and right sides of the upper part of the inner cavity of the L-shaped flue. Anti-clogging mechanisms are movably connected inside both air jet components. Diverting components are threadedly connected to the upper sides of both air jet components. An ammonia injection manifold is fixedly connected to the upper part of both diverting components. An ammonia injection header is fixedly connected to the upper input end of the outer surface of the ammonia injection manifold.

[0009] Preferably, the diversion assembly includes an ammonia injection branch pipe, the upper end of the outer surface of the ammonia injection branch pipe is fixedly connected to an internally threaded sleeve, and the upper end of the outer surface of the ammonia injection branch pipe is fixedly connected to the corresponding output end at the lower part of the ammonia injection manifold.

[0010] Preferably, the bearing mechanism includes a bearing frame, and fixing blocks are symmetrically fixedly connected to the front end of the outer surface of the bearing frame. Positioning holes are opened in the middle of the two fixing blocks at their respective ends that are close to each other. The bearing frame is installed and fixed in the middle left side of the L-shaped flue cavity.

[0011] Preferably, the dustproof mechanism includes a transmission frame, a dustproof net is installed and fixed in the inner cavity of the transmission frame, a connecting plate is fixedly connected to the front end of the outer surface of the transmission frame, and the outer surface of the transmission frame is slidably connected to the inner cavity of the bearing frame.

[0012] Preferably, the positioning mechanism includes a fixed sleeve, a spring sheet is fixedly connected to the left wall of the inner cavity of the fixed sleeve, a hemispherical block is fixedly connected to the right end of the outer surface of the spring sheet, and the outer surface of the fixed sleeve is fixedly connected to the inner cavity of the connecting plate.

[0013] Preferably, the jet assembly includes a nozzle, and a plurality of limiting grooves are formed on the upper end of the outer surface of the nozzle.

[0014] Preferably, the anti-blocking mechanism includes a cross plate, and a spiral guide plate is fixedly connected to the middle of the lower end of the outer surface of the cross plate, and the cross plate is movably connected to the inner cavity of the limiting groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This utility model uses a bearing mechanism to support and limit the dustproof mechanism, which filters and intercepts dust and other impurities. A positioning mechanism allows for easy locking of the dustproof mechanism's position, improving the device's practicality. An air jet assembly propels ammonia gas at high speed into the L-shaped flue cavity. An anti-blocking mechanism prevents impurities from clogging the air jet assembly. Furthermore, a diversion assembly diverts and transports the ammonia gas, enhancing the device's practicality and versatility.

[0017] 2. This utility model, by setting a spiral guide vane in the inner cavity of the nozzle, can force ammonia gas to flow along a spiral path, changing the original laminar flow state into turbulent flow. This allows the shear force of the turbulent flow to peel off fly ash or crystals that have adhered to the inner wall of the nozzle, preventing them from accumulating into clumps. At the same time, a dustproof net is set on the upper left side of the L-shaped flue inner cavity, which can intercept large particles of fly ash, reduce the risk of nozzle blockage, and improve the practicality and universality of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the current splitter component of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the bearing mechanism, dustproof mechanism, and positioning mechanism of this utility model;

[0021] Figure 4 This is a schematic diagram of the jet assembly and anti-blocking mechanism of this utility model.

[0022] In the diagram: 1. L-shaped flue; 2. Bearing mechanism; 21. Bearing frame; 22. Fixing block; 23. Positioning hole; 3. Dustproof mechanism; 31. Transmission frame; 32. Dustproof net; 33. Connecting plate; 4. Positioning mechanism; 41. Fixing sleeve; 42. Spring plate; 43. Hemispherical block; 5. Air jet assembly; 51. Nozzle; 52. Limiting groove; 6. Anti-clogging mechanism; 61. Cross plate; 62. Spiral guide vane; 7. Diversion assembly; 71. Ammonia injection branch pipe; 72. Internal threaded sleeve; 8. Ammonia injection manifold; 9. Ammonia injection main pipe. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] like Figure 1As shown, an anti-clogging device for an SCR denitrification ammonia injection grid includes an L-shaped flue 1. A bearing mechanism 2 is fixedly connected to the left side of the middle of the inner cavity of the L-shaped flue 1, which can bear and limit the dust prevention mechanism 3. The dust prevention mechanism 3 is slidably connected inside the bearing mechanism 2, which can filter and intercept dust and other impurities. Positioning mechanisms 4 are symmetrically fixedly connected to the left and right sides of the front of the dust prevention mechanism 3, which can lock the position of the dust prevention mechanism 3. Jet components 5 are symmetrically fixedly connected to the left side of the upper part of the inner cavity of the L-shaped flue 1, which can spray ammonia gas at high speed into the inner cavity of the L-shaped flue 1. Anti-clogging mechanisms 6 are movably connected inside the two jet components 5, which can prevent impurities from clogging inside the jet components 5. Diverting components 7 are threadedly connected to the upper side of the two jet components 5, which can divert and transport ammonia gas. An ammonia injection manifold 8 is fixedly connected to the upper part of the two diverting components 7. An ammonia injection header 9 is fixedly connected to the upper input end of the outer surface of the ammonia injection manifold 8.

[0025] To achieve the purpose of diverting and transporting ammonia, see [reference needed]. Figure 2 The diversion assembly 7 includes an ammonia injection branch pipe 71. An internally threaded sleeve 72 is fixedly connected to the upper end of the outer surface of the ammonia injection branch pipe 71, which can be assembled and connected with the corresponding nozzle 51. The upper end of the outer surface of the ammonia injection branch pipe 71 is fixedly connected to the corresponding output end at the lower part of the ammonia injection manifold 8.

[0026] To achieve the purpose of bearing and limiting the dustproof mechanism 3, refer to Figure 3 The supporting mechanism 2 includes a supporting frame 21. The front end of the outer surface of the supporting frame 21 is symmetrically fixed with fixing blocks 22. The middle of the two fixing blocks 22 at the end that is close to each other on the outer surface of the two fixing blocks 22 is provided with positioning holes 23, which can realize the function of accommodating and limiting the corresponding hemispherical blocks 43. The supporting frame 21 is installed and fixed on the left side of the middle of the inner cavity of the L-shaped flue 1.

[0027] To achieve the purpose of filtering and intercepting dust and other impurities, please refer to... Figure 3 The dustproof mechanism 3 includes a transmission frame 31. A dustproof net 32 ​​is installed and fixed inside the transmission frame 31, which can intercept large particles of fly ash inside the L-shaped flue 1 and reduce the risk of nozzle 51 blockage. A connecting plate 33 is fixedly connected to the front end of the outer surface of the transmission frame 31, and the outer surface of the transmission frame 31 is slidably connected to the inner cavity of the bearing frame 21.

[0028] To facilitate locking the position of the dustproof mechanism 3, please refer to... Figure 3 The positioning mechanism 4 includes a fixed housing 41, a spring plate 42 is fixedly connected to the left wall of the inner cavity of the fixed housing 41, a hemispherical block 43 is fixedly connected to the right end of the outer surface of the spring plate 42, and the outer surface of the fixed housing 41 is fixedly connected to the inner cavity of the connecting plate 33.

[0029] The rebound force of the two spring plates 42 can push the corresponding hemispherical block 43 outward and lock it in the cavity of the corresponding positioning hole 23, thereby locking the transmission frame 31 in the cavity of the bearing frame 21.

[0030] To achieve the goal of high-speed ejection of ammonia gas into the inner cavity of the L-shaped flue 1, refer to... Figure 4 The jet assembly 5 includes a nozzle 51, and a plurality of limiting grooves 52 are provided on the upper end of the outer surface of the nozzle 51, which can realize the function of accommodating and limiting the cross plate 61.

[0031] To prevent impurities from clogging the inside of jet assembly 5, see [reference needed]. Figure 4 The anti-blocking mechanism 6 includes a cross plate 61. A spiral guide plate 62 is fixedly connected to the middle of the lower end of the outer surface of the cross plate 61. The cross plate 61 is movably connected to the inner cavity of the limiting groove 52. The outer surface of the spiral guide plate 62 is completely in contact with the inner wall of the nozzle 51. The spiral angle and lead of the spiral guide plate 62 are adapted to the inner cavity size of the nozzle 51.

[0032] By setting a spiral guide vane 62 inside the nozzle 51, the spiral structure generates centrifugal force during the flow of ammonia gas. This causes denser particles, such as fly ash, to be thrown towards the outer edge of the spiral guide vane 62 due to centrifugal force, thereby preventing large particles of impurities from entering the core area of ​​the nozzle 51 and reducing the risk of blockage.

[0033] The working principle of this utility model is as follows: After connecting the upper input end of the ammonia injection main pipe 9 to the output end of the external ammonia storage equipment, an appropriate amount of ammonia enters the inner cavity of the ammonia injection manifold 8 and is then diverted to the inner cavities of the two ammonia injection branch pipes 71. At this time, the ammonia flowing into the inner cavity of the corresponding nozzle 51 along the inner cavity of the ammonia injection branch pipe 71 will flow downwards in a spiral shape along the surface of the spiral guide plate 62. Thus, the spiral guide plate 62 can guide the flow direction of the ammonia, thereby greatly reducing the phenomenon of impurities clogging the inner cavity of the nozzle 51. At the same time, the particulate impurities contained in the ammonia currently being transported to the upper left side of the inner cavity of the L-shaped flue 1 along the nozzle 51 will be intercepted and filtered by the dustproof net 32. When it is necessary to adjust the spiral guide plate 62... During cleaning, rotate the internal threaded sleeve 72 to remove it from the upper surface of the corresponding nozzle 51. Then, slide the cross plate 61 upward along the inner cavity of the limiting groove 52 until the spiral guide plate 62 is removed from the inner cavity of the nozzle 51. When it is necessary to clean the impurities and dust attached to the surface of the dustproof net 32, pull the connecting plate 33 forward so that the two hemispherical blocks 43 squeeze the corresponding spring plates 42 respectively. At this time, the hemispherical blocks 43 will slide into the inner cavity of the corresponding fixed sleeve 41, so that the two hemispherical blocks 43 slide out from the inner cavity of the corresponding positioning hole 23 respectively. Thus, the transmission frame 31 can be slid out along the inner cavity of the bearing frame 21. Finally, the particulate impurities and dust attached to the surface of the dustproof net 32 ​​can be cleaned.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A SCR denitrification ammonia injection grid anti-clogging device, comprising an L-shaped flue (1), characterized in that: The L-shaped flue (1) has a bearing mechanism (2) fixedly connected to the left side of the middle part of the inner cavity. The bearing mechanism (2) has a dustproof mechanism (3) slidably connected inside. The dustproof mechanism (3) has a positioning mechanism (4) symmetrically fixedly connected to the left and right sides of the front left side. The L-shaped flue (1) has jet assembly (5) symmetrically fixedly connected to the left and right sides of the upper part of the inner cavity. The two jet assemblies (5) have an anti-blocking mechanism (6) movably connected inside. The two jet assemblies (5) have a diversion assembly (7) threadedly connected to the upper side of the outside. The two diversion assemblies (7) are fixedly connected to the upper part of the ammonia injection manifold (8). The ammonia injection manifold (8) has an ammonia injection header (9) fixedly connected to the upper input end of the outer surface of the ammonia injection manifold (8).

2. The anti-clogging device for the SCR denitrification ammonia injection grid according to claim 1, characterized in that: The diversion assembly (7) includes an ammonia injection branch pipe (71), and an internally threaded sleeve (72) is fixedly connected to the upper end of the outer surface of the ammonia injection branch pipe (71). The upper end of the outer surface of the ammonia injection branch pipe (71) is fixedly connected to the corresponding output end of the lower part of the ammonia injection manifold (8).

3. The anti-clogging device for the SCR denitrification ammonia injection grid according to claim 1, characterized in that: The bearing mechanism (2) includes a bearing frame (21). The front end of the outer surface of the bearing frame (21) is symmetrically connected with fixing blocks (22). The middle of the two fixing blocks (22) at the ends of their outer surfaces that are close to each other is provided with positioning holes (23). The bearing frame (21) is installed and fixed on the left side of the middle of the inner cavity of the L-shaped flue (1).

4. The anti-clogging device for the SCR denitrification ammonia spray grid according to claim 3, characterized in that: The dustproof mechanism (3) includes a transmission frame (31), a dustproof net (32) is installed and fixed in the inner cavity of the transmission frame (31), a connecting plate (33) is fixedly connected to the front end of the outer surface of the transmission frame (31), and the outer surface of the transmission frame (31) is slidably connected to the inner cavity of the bearing frame (21).

5. The anti-clogging device for the SCR denitrification ammonia injection grid according to claim 4, characterized in that: The positioning mechanism (4) includes a fixed housing (41), a spring plate (42) is fixedly connected to the left wall of the inner cavity of the fixed housing (41), a hemispherical block (43) is fixedly connected to the right end of the outer surface of the spring plate (42), and the outer surface of the fixed housing (41) is fixedly connected to the inner cavity of the connecting plate (33).

6. The anti-clogging device for the SCR denitrification ammonia injection grid according to claim 1, characterized in that: The jet assembly (5) includes a nozzle (51), and a plurality of limiting grooves (52) are provided on the upper end of the outer surface of the nozzle (51).

7. The anti-clogging device for the SCR denitrification ammonia injection grid according to claim 6, characterized in that: The anti-blocking mechanism (6) includes a cross plate (61), and a spiral guide plate (62) is fixedly connected to the middle of the lower end of the outer surface of the cross plate (61), and the cross plate (61) is movably connected to the inner cavity of the limiting groove (52).

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