SNCR (selective non-catalytic reduction) spray gun protection mechanism

Abstract

The utility model relates to the technical field of denitration, and discloses an SNCR (selective non-catalytic reduction) spray gun protection mechanism which comprises a spray gun and a sleeve, a furnace entering section of the spray gun is sleeved by the sleeve, an adjusting disc used for adjusting the rotating angle of the sleeve is arranged at the tail of the sleeve, a fixing disc is sleeved on the peripheral surface of the spray gun, and the adjusting disc and the fixing disc are connected through a locking structure. The sleeve is sleeved with an air blowing ring close to the adjusting disc. The circumferential position of the sleeve is adjusted by rotating the sleeve, so that the bottom of the sleeve which is originally subjected to impact of head-on air flue gas from bottom to top for a long time can periodically rotate to other non-direct impact positions, concentrated abrasion is dispersed into uniform abrasion in the circumferential direction of the sleeve, and rapid damage to a single part is avoided; the sleeve replacement period is remarkably prolonged, the shutdown replacement time and the sleeve consumable cost are reduced, meanwhile, the situation that the operation of the refuse incinerator is interrupted due to frequent replacement of the sleeve is avoided, and the system stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of denitration, in particular to an SNCR spray gun protection mechanism. Background Art

[0002] In the field of waste incineration treatment, in order to reduce nitrogen oxide emissions, the selective non-catalytic reduction denitration technology (SNCR) is widely used due to its advantages such as simple operation and low cost. The spray gun is a key device in the SNCR system. The spray gun atomizes the reducing agent solution and sprays it into the furnace and mixes it fully with the flue gas. Its working performance directly affects the denitration efficiency. However, during the actual operation process, the part of the spray gun extending into the furnace is continuously scoured by the oncoming wind flue gas carrying hard particles, and it is extremely easy to form coke and serious wear, resulting in a significant reduction in the service life of the spray gun. Frequent replacement not only increases the operation and maintenance costs, but also affects the stable operation of the waste incinerator.

[0003] To solve the above problems, the prior art usually installs a casing outside the spray gun. Through the protection of the casing, the direct erosion of the flue gas on the spray gun body can be effectively reduced, thereby improving the service life of the spray gun. However, it is found in actual applications that due to the upward flow direction of the oncoming wind flue gas in the waste incinerator, the bottom of the casing will be continuously impacted by the oncoming wind flue gas. Compared with other parts of the casing, its bottom is more severely worn. This local excessive wear phenomenon leads to a significant reduction in the overall service life of the casing. Frequent replacement of the casing will also increase the operation and maintenance costs and downtime, and it is difficult to meet the requirements of the efficient and stable operation of the waste incinerator. Therefore, there is an urgent need for a technical solution that can effectively solve the problem of excessive wear at the bottom of the casing to further improve the performance and reliability of the SNCR spray gun protection mechanism. Summary of the Utility Model

[0004] In view of the deficiencies of the above prior art, the purpose of the present utility model is to provide an SNCR spray gun protection mechanism, aiming to prevent the rapid breakage of a single part of the casing and extend the casing replacement cycle.

[0005] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0006] An SNCR spray gun protection mechanism includes a spray gun and a casing. The furnace inlet section of the spray gun is sleeved by the casing. An adjustment disk for adjusting the rotation angle of the casing is arranged at the tail of the casing. A fixed disk is sleeved on the outer peripheral surface of the spray gun. The adjustment disk and the fixed disk are connected by a locking structure. A blowing ring is sleeved on the casing and is arranged close to the adjustment disk. An air duct is formed inside the blowing ring. A plurality of blowing nozzles arranged in a circumferential array are opened on the front end surface of the blowing ring. The blowing nozzles are used for axially blowing the outer surface of the casing. An air inlet is arranged at the top of the blowing ring.

[0007] As a further improvement of the above technical solution, the locking structure includes a plurality of positioning holes arranged on the adjusting disc in a circumferential array, and a first threaded hole opened on the fixed disc and cooperating with the positioning holes for positioning. The adjusting disc is positioned by a first screw passing through one of the positioning holes and the first threaded hole.

[0008] As a further improvement of the above technical solution, a handle for applying force is provided on the adjusting disc.

[0009] As a further improvement of the above technical solution, three second threaded holes communicating with the central hole are opened on the outer peripheral surface of the fixed disc, and each second threaded hole is connected with a second screw to lock the fixed disc on the spray gun.

[0010] As a further improvement of the above technical solution, a step for aligning and positioning the tail of the sleeve is formed on the spray gun.

[0011] As a further improvement of the above technical solution, the outer diameter of the sleeve gradually decreases from the tail to the head.

[0012] As a further improvement of the above technical solution, a magnet is provided on the back surface of the blowing ring, and the magnet can be magnetically combined with the adjusting disc.

[0013] As a further improvement of the above technical solution, an outwardly expanding pipe section is formed at the head of the sleeve.

[0014] As a further improvement of the above technical solution, a ceramic coating is provided on the sleeve.

[0015] Advantages of the present utility model: The SNCR spray gun protection mechanism provided by the present utility model solves the technical problem that the bottom of the traditional sleeve is worn out and scrapped first due to being fixed. By rotating the sleeve to adjust its circumferential position, the bottom of the sleeve, which originally bears the oncoming wind and flue gas impact from bottom to top for a long time, can be periodically rotated to other non-direct impact positions, dispersing the concentrated wear into uniform wear in the circumferential direction of the sleeve, avoiding rapid breakage at a single part; significantly extending the replacement cycle of the sleeve, reducing the downtime for replacement and the cost of sleeve consumables, and at the same time avoiding the interruption of the operation of the waste incinerator caused by frequent replacement of the sleeve, improving the system stability. Brief Description of the Drawings

[0016] Figure 1 is a perspective view of the SNCR spray gun protection mechanism provided by the present utility model.

[0017] Figure 2 is an exploded view of the SNCR spray gun protection mechanism provided by the present utility model.

[0018] Figure 3 is a cross-sectional view of the SNCR spray gun protection mechanism provided by the present utility model.

[0019] Description of main component symbols: 1 - spray gun, 11 - step, 2 - sleeve, 3 - adjustment disk, 31 - handle, 4 - fixing disk, 41 - second threaded hole, 42 - second screw, 51 - positioning hole, 52 - first threaded hole, 53 - first screw, 6 - blowing ring, 61 - blowing nozzle, 62 - air inlet, 63 - magnet. Specific implementation mode

[0020] The present utility model provides an SNCR spray gun protection mechanism. To make the purpose, technical solution and effect of the present utility model clearer and more definite, the following further details the present utility model with reference to the attached drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the protection scope of the present utility model.

[0021] Please refer to Figures 1 to 3 The present utility model provides an SNCR spray gun protection mechanism, including a spray gun 1 and a sleeve 2. The furnace inlet section of the spray gun 1 is sleeved by the sleeve 2. A regulating disk 3 for adjusting the rotation angle of the sleeve 2 is arranged at the tail of the sleeve 2. A fixing disk 4 is sleeved on the outer peripheral surface of the spray gun 1. The regulating disk 3 and the fixing disk 4 are connected by a locking structure.

[0022] When the spray gun 1 extends into the furnace chamber of the waste incinerator, the furnace inlet section of the spray gun 1 is sleeved and protected by the sleeve 2 to reduce the direct scouring of the flue gas on the spray gun 1 body. Since the oncoming wind flue gas in the furnace chamber flows from bottom to top, that is, the flue gas mainly impacts from the bottom direction of the sleeve 2, long-term operation will cause excessive wear at the bottom of the sleeve 2. At this time, by unlocking the locking structure between the regulating disk 3 and the fixing disk 4, the sleeve 2 can be rotated around the axis of the spray gun 1, so that other parts of the sleeve 2 that have not been severely worn (such as the side or top) are turned to the flue gas impact direction; after adjusting to a suitable angle, the regulating disk 3 and the fixing disk 4 are locked again to fix the sleeve 2 in the new position. Rotating the sleeve 2 to adjust the angle periodically according to the wear condition can make each part of the sleeve 2 bear the flue gas impact in turn, avoiding local excessive wear caused by continuous impact on a single part.

[0023] The SNCR spray gun protection mechanism provided by the utility model solves the technical problem that the bottom of the traditional sleeve 2 is worn out and scrapped first due to being fixed. By rotating the sleeve 2 to adjust its circumferential position, the bottom of the sleeve 2 that originally bears the oncoming wind and flue gas impact from bottom to top can be periodically rotated to other non-direct impact positions, dispersing the concentrated wear into uniform wear around the circumference of the sleeve 2, avoiding rapid breakage at a single part; significantly extending the replacement cycle of the sleeve 2, reducing the downtime for replacement and the consumable cost of the sleeve 2. At the same time, it avoids the interruption of the operation of the waste incinerator caused by frequent replacement of the sleeve 2, improving the system stability. The locking structure design of the adjusting disk 3 and the fixed disk 4 is convenient for quick adjustment on-site, without the need to disassemble the spray gun 1 or the sleeve 2 as a whole, with simple and efficient operation, and maintenance can be completed in a short time without shutting down the machine.

[0024] It can be understood that the technical solution provided by the utility model does not require large-scale modification of the structures of the existing SNCR spray gun 1 and the sleeve 2. Only the adjusting disk 3, the fixed disk 4 and the locking structure need to be added, which is easy for engineering transformation and batch application. The adjusting disk 3 can be specifically installed on the sleeve 2 by welding, or a sleeve 2 with an adjusting disk 3 (i.e., the adjusting disk 3 and the sleeve 2 are integrally formed) can be selected.

[0025] Specifically, the locking structure includes a plurality of positioning holes 51 arranged in a circumferential array on the adjusting disk 3 and a first threaded hole 52 opened on the fixed disk 4 and cooperating with the positioning holes 51 for positioning. The adjusting disk 3 is positioned by a first screw 53 passing through one of the positioning holes 51 and the first threaded hole 52. The arrangement of the plurality of positioning holes 51 enables the operator to flexibly adjust the rotation angle of the sleeve 2 according to the actual flue gas flow direction and impact intensity in the waste incinerator. When a certain part of the sleeve 2 is worn, only need to loosen the first screw 53, then rotate the positioning hole 51 corresponding to the part to be replaced to the position of the threaded hole and tighten the first screw 53 again for fixation. The adjustment is quick, simple and accurate in positioning, avoiding the flue gas impact direction for the worn area, thus realizing the uniform wear of the sleeve 2, making full use of the overall structure of the sleeve 2 and further extending its service life.

[0026] In this embodiment, 4 positioning holes 51 are provided, with a moderate number, providing 4 different rotation adjustment angle options for the sleeve 2. The staff can accurately adjust the sleeve 2 to directions such as 90°, 180° or 270° according to the actual flow direction of the flue gas in the furnace and the wear condition of the sleeve 2, which can not only effectively avoid the worn area directly impacted by the flue gas, but also ensure the diversity of the adjustment angle, making the wear of the sleeve 2 more uniform and extending the overall service life.

[0027] Adopting a screw-fastening connection method, it can still maintain good connection stability and reliability under the harsh working conditions of high temperature, high dust, and strong vibration in the waste incinerator, avoiding the loosening of the sleeve 2 caused by locking failure, thus preventing the spray gun 1 from being exposed and damaged, ensuring the safe and stable operation of the SNCR denitration system, and reducing potential production safety hazards caused by equipment failures.

[0028] Furthermore, a handle 31 for applying force is provided on the adjusting disc 3. With the handle 31 as the force application point, the operation of rotating the adjusting disc 3 becomes easy and labor-saving. At the site of the waste incinerator, the staff can conveniently rotate the adjusting disc 3 with only hand strength without the need for additional tools, completing the adjustment of the angle of the sleeve 2, greatly simplifying the operation process, improving the efficiency of maintenance work, and being particularly suitable for working conditions that require frequent adjustment of the angle of the sleeve 2.

[0029] This embodiment provides a simple and reliable installation method for the fixed disc 4. Three second threaded holes 41 communicating with its central hole are provided on the outer peripheral surface of the fixed disc 4, and each second threaded hole 41 is connected to a second screw 42 to lock the fixed disc 4 on the spray gun 1. The three second threaded holes 41 are distributed at intervals of 120° along the outer peripheral surface of the fixed disc 4. By radially pressing against the outer surface of the spray gun 1 with the second screws 42, a stable triangular clamping force is formed. This multi-directional and symmetric locking method can effectively prevent the fixed disc 4 from sliding axially or rotating circumferentially along the spray gun 1, ensuring that the fixed disc 4 and the spray gun 1 always maintain a rigid connection, providing a stable reference for the angle adjustment of the adjusting disc 3 and the sleeve 2.

[0030] A new sleeve 2 can be replaced, or the fixed disc 4 on the spray gun 1 can continue to be used to re-fix the new sleeve 2.

[0031] A step 11 for aligning and positioning the tail of the sleeve 2 is formed on the spray gun 1. During installation, just fit the tail of the sleeve 2 to the step 11, and the axial position of the sleeve 2 on the spray gun 1 can be quickly and accurately determined. The sleeve 2 always maintains the best covering length with the furnace inlet section of the spray gun 1, that is, the distance between the front end of the sleeve 2 and the nozzle of the spray gun 1 is determined, ensuring both the mixing effect of the reducing agent atomized and sprayed into the furnace and the accurate and stable protection range of the sleeve 2 for the spray gun 1, avoiding local protection failure or over-protection caused by axial position deviation.

[0032] The flue gas in the waste incinerator contains a large amount of unburned carbon particles, ash and viscous substances, which are likely to deposit on the surface of the sleeve 2 to form a coking layer. Coking will not only thicken the local thickness of the sleeve 2, but also cause stress cracking due to the difference in the thermal expansion coefficients of the coking layer and the sleeve 2 material. Therefore, a blowing ring 6 is sleeved on the sleeve 2 and is arranged close to the adjusting disc 3. An air duct is formed inside the blowing ring 6. A plurality of blowing nozzles 61 arranged in a circumferential array are opened on the front end surface of the blowing ring 6. The blowing nozzles 61 are used to axially blow the outer surface of the sleeve 2. An air inlet 62 is arranged at the top of the blowing ring 6. The primary air supply unit of the waste incinerator is connected to the air inlet 62 of the blowing ring 6 through an air supply duct, directly using the air supply generated during the operation of the incinerator as the air source, without the need to additionally equip an independent air supply device, reducing the equipment cost and energy consumption. Specifically, in the waste incinerator system, the primary air supply unit is an important air supply component during the incineration process, and its main function is to provide necessary oxygen for waste combustion and is usually located in the bottom area of the incinerator. This is because the waste undergoes a combustion reaction at the bottom of the incinerator. By arranging the primary air supply unit here, the air can be in full contact with the waste, ensuring the stability and efficiency of the combustion process.

[0033] One end of the air supply duct is closely connected to the air outlet of the primary air supply unit. To ensure the sealing and stability of the connection, a flange connection method is adopted at the connection, fastened by bolts, and a sealing gasket is added to prevent air leakage during the air supply process. The air supply duct extends upward along the side wall of the incinerator. In order to keep the air supply duct fixed during the extension process and not affect the normal operation of the incinerator, fixing brackets are arranged at certain intervals between the air supply duct and the side wall of the incinerator. These fixing brackets are connected to the side wall of the incinerator by welding or bolt connection, and at the same time play a role in supporting and positioning the air supply duct, ensuring the stable direction of the air supply duct.

[0034] When the air flow of the primary air supply unit enters the air duct through the air inlet 62 and is ejected at high speed through the blowing nozzles 61, a continuous and uniform air film (air curtain) will be formed on the outer surface of the sleeve 2. This air film can effectively prevent the flue gas carrying hard particles in the furnace from directly scouring the surface of the sleeve 2. The particles in the flue gas will be deflected or accelerated and carried away by the air film before contacting the sleeve 2, greatly reducing the collision frequency and impact intensity of the particles with the sleeve 2.

[0035] Since the nozzle of the spray gun 1 is adjacent to the head of the sleeve 2, and the head of the sleeve 2 directly faces the high-speed flowing flue gas and hard particles, it is a part with relatively serious wear. Therefore, the outer diameter of the sleeve 2 gradually decreases from the tail to the head. The design of the gradually decreasing outer diameter reduces the windward area of the head, and the impact force of the flue gas and the impact force of the particles per unit area are reduced. At the same time, when the particles carried by the flue gas flow through the tapered sleeve 2, they are more likely to deviate from the surface of the sleeve 2 under the guidance of the air flow, further reducing the wear degree of the head of the sleeve 2. Compared with the traditional straight cylindrical sleeve 2, the tapered outer diameter allows the oncoming wind flue gas to flow more smoothly along the surface of the sleeve 2, reducing the eddy current and turbulent flow phenomena of the flue gas on the surface of the sleeve 2. This not only reduces the flow resistance of the flue gas, but also avoids the local high-scouring area caused by the air flow disorder, thereby reducing the surface wear of the sleeve 2.

[0036] A magnet 63 is provided on the back of the blowing ring 6. The magnet 63 can be magnetically coupled with the adjusting disc 3, and the adsorption force provided by the iron can ensure that the blowing ring 6 is firmly attached to the adjusting disc 3. By means of magnetic attraction, the staff does not need to use additional tools. Only by approaching the blowing ring 6 to the adjusting disc 3, the magnet 63 can be quickly adsorbed and fixed, greatly shortening the installation time; when disassembling, only the magnetic force needs to be overcome for separation, avoiding the cumbersome operation of repeatedly screwing in the traditional screw fixation, especially suitable for on-site rapid repair and debugging scenarios, and significantly improving the equipment maintenance efficiency. When the adjusting disc 3 rotates, in order to avoid affecting the wiring of the blowing ring 6, the blowing ring 6 can be rotated accordingly.

[0037] Preferably, a ceramic coating is provided on the sleeve 2. The ceramic coating has a smooth surface, extremely high hardness and wear resistance, and can effectively resist the scouring of the oncoming wind flue gas carrying hard particles. Compared with the ordinary metal sleeve 2, after the ceramic coating is applied, the ability of the surface of the sleeve 2 to resist particle impact and friction is greatly enhanced, significantly reducing the wear rate, prolonging the service life of the sleeve 2, and reducing the replacement frequency and maintenance cost caused by wear.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0039] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and can be the internal communication between two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solution and the inventive concept of the present utility model, and all such changes or substitutions should fall within the protection scope of the present utility model.

Claims

1. A SNCR spray gun protection mechanism, characterized in that, It includes a spray gun and a sleeve. The furnace inlet section of the spray gun is sleeved by the sleeve. An adjustment disc for adjusting the rotation angle of the sleeve is provided at the tail of the sleeve. A fixing disc is sleeved on the outer peripheral surface of the spray gun. The adjustment disc and the fixing disc are connected by a locking structure. A blowing ring is sleeved on the sleeve and is arranged close to the adjustment disc. An air duct is formed inside the blowing ring. A plurality of blowing nozzles arranged in a circumferential array are provided on the front end surface of the blowing ring. The blowing nozzles are used for axially blowing the outer surface of the sleeve. An air inlet is provided at the top of the blowing ring.

2. The SNCR spray gun protection mechanism according to claim 1, characterized in that, The locking structure includes a plurality of positioning holes arranged in a circumferential array on the adjustment disc and a first threaded hole opened on the fixing disc and cooperating with the positioning holes for positioning. The adjustment disc is positioned by a first screw passing through one of the positioning holes and the first threaded hole.

3. The SNCR spray gun protection mechanism according to claim 2, characterized in that, A handle for applying force is provided on the adjustment disc.

4. The SNCR spray gun protection mechanism according to claim 1, characterized in that, Three second threaded holes communicating with its central hole are opened on the outer peripheral surface of the fixing disc. Each second threaded hole is connected with a second screw to lock the fixing disc on the spray gun.

5. The SNCR spray gun protection mechanism according to claim 1, wherein A step for aligning and positioning the tail of the sleeve is formed on the spray gun.

6. The SNCR spray gun protection mechanism according to claim 1, wherein The outer diameter of the sleeve gradually decreases from the tail to the head.

7. The SNCR spray gun protection mechanism according to claim 1, characterized in that, A magnet is provided on the back surface of the blowing ring, and the magnet can be magnetically combined with the adjustment disc.

8. The SNCR spray gun protection mechanism according to any one of claims 1-7, characterized in that, The sleeve is provided with a ceramic coating.

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