A deammonia removal spray device for cement kiln flue gas

Abstract

This utility model relates to the field of cement production technology, specifically to an ammonia removal spray device for cement kiln flue gas. It includes an installation ring with spray pipes on both sides inside the ring. A liquid supply pipe is connected to the middle of each spray pipe. Multiple sets of composite anti-clogging nozzle assemblies are evenly arranged on the spray pipes. Each anti-clogging nozzle assembly includes an outer casing, an inner nozzle, and an annular buffer chamber between them. The front end of the outer casing has a spirally extending inclined water outlet slit. The inner nozzle passes through the center of the annular buffer chamber and communicates with the spray pipe. This ammonia removal spray device for cement kiln flue gas improves anti-clogging ability and atomization uniformity, effectively improves the mixing effect of ammonia water and flue gas, reduces ammonia escape, and improves denitrification efficiency.

Description

Technical Field

[0001] This utility model relates to the field of cement production technology, specifically to a deammoniation spraying device for cement kiln flue gas. Background Technology

[0002] During the cement clinker calcination process, nitrogen reacts with oxygen at high temperatures to generate a large amount of nitrogen oxides. To meet environmental protection requirements, selective non-catalytic reduction (SNR) or selective catalytic reduction (SCR) denitrification technologies are commonly used. These technologies reduce NOx to nitrogen and water by injecting ammonia or urea solution into the high-temperature flue gas. In this process, the spraying device, as a key component in mixing the ammonia reducing agent with the flue gas, directly affects the denitrification efficiency and ammonia escape control.

[0003] Currently, conventional spraying devices mostly use straight-through nozzles or ordinary atomizing nozzles. Their spray angle is fixed, and the droplet size distribution is uneven. Moreover, in the high-temperature and high-dust environment of cement kiln flue gas, the nozzle outlet is easily blocked by dust or crystalline salt, which leads to the shrinkage of the spray cone angle and the decrease in atomization effect. This results in uneven mixing of ammonia reducing agent and flue gas, with local areas experiencing excessive or insufficient ammonia. This not only reduces the denitrification efficiency but also exacerbates the subsequent corrosion and deposition problems caused by ammonia escape. Utility Model Content

[0004] The purpose of this invention is to provide an ammonia removal spray device for cement kiln flue gas, in order to solve the problems mentioned in the background art, such as the nozzles of current spray devices being easily blocked by high temperature and high dust environment, poor atomization effect, and uneven distribution of ammonia water due to spray cone angle contraction, which in turn reduces denitrification efficiency and aggravates ammonia escape.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an ammonia removal spray device for cement kiln flue gas, comprising an installation ring, spray pipes on both sides inside the installation ring, a liquid supply pipe connected in the middle of the spray pipes, and multiple sets of composite anti-clogging nozzle assemblies evenly arranged on the spray pipes. Each anti-clogging nozzle assembly includes an outer shell, an inner core nozzle, and an annular buffer cavity between the two. The front end face of the outer shell is provided with a spirally extending inclined water outlet slit, and the inner core nozzle passes through the center of the annular buffer cavity and communicates with the spray pipe.

[0006] Preferably, the outer casing is a cylindrical structure, with at least three spiral grooves distributed at equal angles along the circumferential direction on its front wall, and the inclined water outlet is arranged along the extension direction of the spiral grooves, and the outlet edge of the inclined water outlet is inclined at 30°-60° relative to the axis.

[0007] Preferably, the inlet of the annular buffer chamber is connected to the interior of the spray pipe through radially distributed guide holes, and the annular buffer chamber is provided with an annular guide plate, which has a gradually narrowing annular gap structure along the flow direction.

[0008] Preferably, the inner core nozzle has a detachable threaded connection structure, with its front end protruding 1-3mm beyond the end face of the outer casing, and the outlet of the inner core nozzle is provided with a tapered constriction section, the inner wall of which is provided with spiral guide patterns.

[0009] Preferably, the outer casing is connected to the spray pipe via a flange, and its inner wall is provided with a sealing step. The annular buffer cavity is formed by the annular groove on the inner side of the outer casing and the outer peripheral surface of the inner core nozzle.

[0010] Preferably, the width of the inclined water outlet slit is 0.8-1.5mm, the helix angle is 15°-25°, its starting end is connected to the water outlet of the annular buffer cavity, and its end extends to the front edge of the outer casing.

[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows: the ammonia removal spray device for cement kiln flue gas improves anti-clogging ability and atomization uniformity, effectively improves the mixing effect of ammonia water and flue gas, reduces ammonia escape, and improves denitrification efficiency. This device, by setting multiple sets of composite anti-clogging nozzle assemblies on the spray pipe, combined with the synergistic spraying of the spiral inclined water outlet slit on the outer casing and the inner core nozzle, forms a rotating turbulent mist flow, enhancing self-cleaning ability and atomization coverage. Simultaneously, the annular buffer chamber ensures more uniform liquid distribution, further guaranteeing long-term stable operation of the nozzles, making it suitable for high-temperature, high-dust cement kiln flue gas environments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a deammoniation spraying device for cement kiln flue gas according to the present invention.

[0013] Figure 2 This is a schematic diagram of the internal structure of the anti-clogging nozzle assembly of an ammonia removal spray device for cement kiln flue gas according to the present invention.

[0014] Figure 3 This is a schematic diagram of the front end structure of the anti-clogging nozzle assembly of a cement kiln flue gas deammoniation spray device according to the present invention.

[0015] In the diagram: 1. Mounting ring; 2. Spray pipe; 3. Liquid supply pipe; 4. Anti-clogging nozzle assembly; 41. Outer casing; 42. Inner core nozzle; 43. Annular buffer chamber; 44. Inclined water outlet slit; 45. Annular guide plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-3This utility model provides a technical solution: an ammonia removal spray device for cement kiln flue gas, including an installation ring 1. Spray pipes 2 are provided on both sides inside the installation ring 1. A liquid supply pipe 3 is connected to the middle of the spray pipes 2. Multiple sets of composite anti-clogging nozzle assemblies 4 are evenly arranged on the spray pipes 2. Each anti-clogging nozzle assembly 4 includes an outer casing 41, an inner core nozzle 42, and an annular buffer chamber 43 located between the two. The front end face of the outer casing 41 has a spirally extending inclined water outlet slit 44. The inner core nozzle 42 passes through the center of the annular buffer chamber 43 and communicates with the spray pipe 2. In this structure, the ammonia removal liquid enters the spray pipe 2 through the liquid supply pipe 3 and is distributed to each set of composite anti-clogging nozzle assemblies 4. Part of the liquid is directly sprayed forward through the inner core nozzle 42 to form a central mist column, while the other part... After entering the annular buffer chamber 43, the ammonia water is sprayed out tangentially at an inclined outlet slit 44 along the spiral extension of the front end face of the outer casing 41, forming multiple rotating mist streams. These rotating mist streams converge with the central mist column in front of the nozzle, generating strong shearing and turbulence, effectively dispersing the droplets and expanding the spray cone angle, resulting in finer and more uniformly distributed atomized droplets. At the same time, the auxiliary mist streams sprayed out by the rotation create a continuous scouring effect on the outlet area of ​​the inner core nozzle 42, preventing dust particles and crystalline salts in the high-temperature flue gas from accumulating and clogging the nozzle front end, maintaining the long-term stable operation of the nozzle, thereby significantly improving the dispersion and mixing uniformity of ammonia water in cement kiln flue gas. This solves the problems in existing technologies where nozzle clogging and uneven atomization lead to spray cone angle contraction, increased ammonia escape, and decreased denitrification efficiency. The problem is that the outer casing 41 is a cylindrical structure with at least three equally angled spiral grooves on its front wall. An inclined water outlet 44 is positioned along the extension direction of the spiral grooves, and the outlet edge of the inclined water outlet 44 is inclined at 30°-60° relative to the axis. This structure allows the spiral grooves on the front wall of the outer casing 41 to guide the liquid in multiple tangential flows along the circumference. The inclined water outlet 44 ejects the liquid from the annular buffer chamber 43 at a compound angle, generating a high-speed rotating mist. This rotating mist forms a localized low-pressure vortex zone in front of the nozzle, effectively shearing and breaking up the central mist column ejected from the inner nozzle 42, significantly improving the fineness and uniformity of the droplets. Simultaneously, the rotating jet dynamically scours the outlet of the inner nozzle 42 and the end face of the outer casing 41, effectively... To prevent the adhesion and accumulation of dust particles and crystalline salts in high-temperature flue gas, avoid nozzle clogging and spray pattern distortion, and ensure that the spray device maintains a stable spray cone angle and atomization quality during long-term operation, the inlet of the annular buffer chamber 43 is connected to the interior of the spray pipe 2 through radially evenly distributed guide holes. An annular guide plate 45 is installed inside the annular buffer chamber 43, with a gradually narrowing annular gap structure along the flow direction. The deammoniation liquid from the spray pipe 2 enters the annular buffer chamber 43 through the radially evenly distributed guide holes. The liquid flows circumferentially within the gradually narrowing annular gap formed by the annular guide plate 45. This structure allows for pressure equalization and flow rate regulation of the liquid before it enters the inclined outlet slit 44. The gradually narrowing gap gradually increases the fluid linear velocity and suppresses turbulent disturbances.To ensure consistent flow rate across all inclined water outlets 44, the system avoids crystallization and deposition due to excessively low local flow velocities or erosion caused by excessively high flow velocities. Simultaneously, a stable circumferential liquid supply guarantees the symmetry and continuity of the rotating mist flow, enabling the multiple tangential jets ejected from the front end of the outer casing 41 to work in coordination, forming a uniform and stable spiral mist curtain. This effectively improves the overall atomization stability and anti-clogging capability of the nozzle, extending the maintenance cycle of the composite anti-clogging nozzle assembly 4. The inner core nozzle 42 has a detachable threaded connection structure, with its front end protruding 1-3mm from the end face of the outer casing 41. The outlet of the inner core nozzle 42 has a tapered constriction section with spiral guide lines on its inner wall. This structure allows the inner core nozzle 42 to be fixed to the nozzle assembly via a threaded connection, with its front end protruding 1-3mm from the end face of the outer casing 41. This design ensures that the central mist column dominates the spray pattern during ejection. The conical constriction section effectively increases the liquid flow velocity and reduces the initial jet diameter. The spiral guide lines on the inner wall cause the liquid to pre-swirl before ejection, further refining the droplets and enhancing forward penetration. Simultaneously, this protruding structure forms a stepped difference with the end face of the outer casing 41, which, combined with the rotating mist flow ejected from the inclined water outlet 44, creates a multiphase disturbance zone in front of the nozzle, promoting full fusion of the central mist column and the auxiliary mist flow. When the inner core nozzle 42 becomes clogged or worn due to long-term operation, it can be cleaned or replaced individually by unscrewing the inner core nozzle 42 without disassembling the entire nozzle assembly, significantly reducing maintenance difficulty and downtime. This ensures the continuous and efficient operation of the ammonia removal spray device under complex conditions. The outer casing 41 and the spray pipe 2 are connected... The annular buffer chamber 43 is formed by the annular groove on the inner side of the outer casing 41 and the outer peripheral surface of the inner nozzle 42. The outer casing 41 is fixed to the spray pipe 2 via a flange connection. Combined with the sealing steps on the inner wall, a reliable seal is achieved, preventing high-pressure liquid leakage and ensuring stable medium entry into the composite anti-clogging nozzle assembly 4. The annular buffer chamber 43 is precisely enclosed by the annular groove on the inner side of the outer casing 41 and the outer peripheral surface of the inner nozzle 42. This structure forms a closed and volume-controllable circumferential liquid supply channel, allowing the liquid from the spray pipe 2 to be evenly distributed throughout the annular space. This provides a stable and uniformly pressurized liquid source for the inclined water outlet 44, ensuring the consistency of multi-point tangential spraying. The inclined water outlet 44... With a width of 0.8-1.5mm and a spiral angle of 15°-25°, its starting end connects to the outlet of the annular buffer chamber 43, and its ending end extends to the front edge of the outer casing 41. This structure, with its inclined water outlet slit 44, ensures that the liquid obtains sufficient flow velocity and shear effect when passing through the narrow gap, enhancing atomization capability. The spiral angle design of 15°-25° gives the outflow direction both axial propulsion and circumferential rotation components. The liquid is continuously ejected from the starting end along the spiral path and extends to the front edge of the outer casing 41, forming a continuous spiral jet. This structure effectively prolongs the liquid's trajectory and dispersion time during the ejection process, improving the degree of droplet breakage. At the same time, the synergistic effect of multiple water outlet slits forms a stable rotational momentum, enhancing the convergence disturbance with the central mist column of the inner core nozzle 42.This improves overall spray uniformity and coverage, and the optimal match between the narrow slits and the spiral angle ensures sufficient flow while suppressing dust backflow, reducing the risk of clogging and guaranteeing long-term stable operation of the nozzles in high-temperature and high-dust environments.

[0018] Working Principle: When using the ammonia removal spray device for cement kiln flue gas, first align the mounting ring 1 with the pre-embedded flanges on the inner wall of the cement kiln flue via the flanges at both ends, and then tighten the connection with high-strength bolts to ensure accurate axial positioning of the entire device. The liquid supply pipe 3 is connected to the external ammonia or urea solution delivery system via a clamp-type quick-connect structure. The ammonia removal liquid flows into the spray pipe 2 through the liquid supply pipe 3. The liquid is distributed along the pipeline in the spray pipe 2 to multiple sets of composite anti-clogging nozzle assemblies 4 evenly arranged on it. After the liquid enters the composite anti-clogging nozzle assembly 4, part of it is directly sprayed forward through the conical constriction section of the inner core nozzle 42 to form a central mist column, and the other part is guided by the radial guide holes on the side wall of the spray pipe 2. The liquid enters the annular buffer chamber 43 and flows circumferentially within the gradually narrowing annular gap formed by the annular guide plate 45, where it is stabilized and accelerated. The liquid is then sprayed out tangentially from the inclined water outlet 44 extending along the spiral groove on the front face of the outer casing 41, forming multiple spiraling auxiliary mist streams. These rotating mist streams converge and merge with the central mist column sprayed from the inner core nozzle 42 in the space in front of the nozzle, forming a wide-angle atomization area. When maintenance is required, the inner core nozzle 42 can be unscrewed for cleaning or replacement, while the outer casing 41 is fixed to the spray pipe 2 by a flange structure. The metal spiral wound gasket at the sealing step maintains the connection seal. All components work together to achieve continuous and stable spraying operations, thereby completing a series of tasks.

[0019] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deammoniation spraying device for cement kiln flue gas, comprising an installation ring (1), wherein spray pipes (2) are provided on both sides inside the installation ring (1), and a liquid supply pipe (3) is connected to the middle of the spray pipes (2), characterized in that: Multiple sets of composite anti-clogging nozzle assemblies (4) are evenly arranged on the spray pipe (2). Each set of anti-clogging nozzle assembly (4) includes an outer shell (41), an inner core nozzle (42), and an annular buffer cavity (43) between the two. The front end face of the outer shell (41) is provided with a spirally extended inclined water outlet slit (44). The inner core nozzle (42) passes through the center of the annular buffer cavity (43) and communicates with the spray pipe (2).

2. The ammonia removal spray device for cement kiln flue gas according to claim 1, characterized in that: The outer casing (41) is a cylindrical structure with at least three spiral grooves distributed at equal angles along the circumferential direction on its front wall surface. The inclined water outlet (44) is arranged along the extension direction of the spiral grooves, and the outlet edge of the inclined water outlet (44) is inclined at 30°-60° relative to the axis.

3. The device for deaminating the flue gas of a cement kiln according to claim 1, characterized in that: The inlet of the annular buffer chamber (43) is connected to the interior of the spray pipe (2) through radially distributed guide holes, and the annular buffer chamber (43) is provided with an annular guide plate (45) inside the chamber. The annular guide plate (45) has a gradually narrowing annular gap structure along the flow direction.

4. The device for deaminating the flue gas of a cement kiln according to claim 1, characterized in that: The inner core nozzle (42) is a detachable threaded connection structure. Its front end protrudes 1-3mm from the end face of the outer casing (41), and the outlet of the inner core nozzle (42) is provided with a tapered constriction section, and the inner wall of the constriction section is provided with spiral guide patterns.

5. The device for deaminating the flue gas of a cement kiln according to claim 1, characterized in that: The outer casing (41) is connected to the spray pipe (2) by a flange, and its inner wall is provided with a sealing step. The annular buffer cavity (43) is formed by the annular groove on the inner side of the outer casing (41) and the outer peripheral surface of the inner core nozzle (42).

6. The device for deaminating the flue gas of a cement kiln according to claim 1, characterized in that: The width of the inclined water outlet slit (44) is 0.8-1.5mm, the spiral angle is 15°-25°, its starting end is connected to the water outlet of the annular buffer cavity (43), and its end goes around to the front edge of the outer shell (41).

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