Denitration ammonia water nozzle with multi-stage atomization function for cement production

Abstract

The utility model discloses a denitration ammonia water nozzle with multistage atomization function for cement production relates to cement production environmental protection equipment technical field. The utility model discloses an installation panel, the bottom of installation panel is provided with the water injection shell, and the inner chamber of water injection shell is provided with the filter component. Compared with the traditional single pressure formula or centrifugal formula nozzle only relies on ammonia water self -pressure or centrifugal force atomization, the problem of big liquid drop particle, through the first water -jet orifice, the second water -jet orifice and the third water -jet orifice of the inside diameter of the bottom of outer ring body, middle body, inner ring body from big to small, ammonia water is sprayed with different liquid drop particle, and the compressed air is passed into simultaneously with the cooperation gas ring and forms annular airflow and impacts liquid drop, realizes multistage atomization, and this design can significantly reduce ammonia water liquid drop particle size, expands ammonia water and high -temperature flue gas's contact area, makes ammonia water realize more even distribution in flue gas full cross section, avoids the problem that single nozzle leads to contact not sufficient because of big liquid drop particle.

Description

Technical Field

[0001] This utility model belongs to the technical field of environmental protection equipment for cement production, and in particular relates to a denitrification ammonia water nozzle with multi-stage atomization function for cement production. Background Technology

[0002] During the cement production process, the calcination stage of the cement kiln generates a large amount of flue gas containing nitrogen oxides. If directly emitted, it will seriously pollute the atmospheric environment. Therefore, it is necessary to control the emission of nitrogen oxides through denitrification process. At present, the mainstream denitrification technology in the cement industry is SNCR technology. Its core principle is to use ammonia water as a reducing agent, which is sprayed into the high-temperature zone of the cement kiln through a nozzle, so that the ammonia water reacts with the nitrogen oxides in the flue gas to generate harmless nitrogen and water.

[0003] A Chinese patent application with publication number 202120599753.4 discloses a cement rotary kiln tail gas denitrification ammonia water injection device, which includes a metal base with a square hole in the middle. Forked sprayers are fixedly and intermittently on both sides of the square hole in the middle of the base. The sprayers include a feed pipe and a distribution pipe connected to the feed pipe. The discharge pipe is connected to the distribution pipe. The cement rotary kiln tail gas denitrification ammonia water injection device involved in this utility model introduces ammonia water and air into the sprayers set on both sides of the base respectively. When the ammonia water and air are sprayed out through the sprayers on both sides, they form mutual impact between the opposite nozzles, which can refine the ammonia water droplets and improve the ammonia water atomization effect.

[0004] Although this patent can refine ammonia droplets and improve ammonia atomization, it still has the drawback of lacking multi-stage atomization functionality. The single nozzle is mostly a pressure-type or centrifugal structure, relying solely on the pressure of the ammonia itself or centrifugal force for atomization. Limited by its structural design, its atomization effect has significant defects: firstly, the ammonia droplets ejected from a single nozzle are relatively large, resulting in a small contact area between the ammonia and the flue gas, making it impossible to achieve uniform distribution across the entire cross-section; secondly, large-diameter droplets are prone to "agglomeration" in high-temperature flue gas, with some droplets failing to fully react with nitrogen oxides before being discharged with the flue gas, thus wasting ammonia.

[0005] To address these issues, we offer a denitrified ammonia water nozzle with multi-stage atomization for cement production. Utility Model Content

[0006] The purpose of this utility model is to provide a denitrification ammonia water nozzle with multi-stage atomization function for cement production. By combining the filter component and the nozzle component, it solves the problem that most denitrification ammonia water nozzles in the prior art are pressure type or centrifugal type structures, which rely solely on the pressure of the ammonia water itself or centrifugal force to achieve atomization. Due to the limitations of structural design, their atomization effect has obvious defects.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0008] This utility model relates to a denitrification ammonia water nozzle with multi-stage atomization function for cement production. It includes a mounting plate, a water injection shell at the bottom of the mounting plate, a filter assembly inside the water injection shell, and a nozzle assembly at the bottom of the water injection shell. The nozzle assembly includes a mounting head, the top of which is fixedly connected to the bottom of the water injection shell. An outer ring is fixedly connected to the edge of the bottom of the mounting head, and a first spray hole is opened at the bottom of the outer ring. An intermediate body is located at the bottom of the mounting head and within the inner cavity of the outer ring, and a second spray hole is opened at the bottom of the intermediate body. An inner ring is located at the bottom of the mounting head and within the inner cavity of the intermediate body, and a third spray hole is opened at the bottom of the inner ring. An air receiving ring is fixedly connected to the bottom of the surface of the water injection shell, and an air jet hood is fixedly connected to the bottom of the air receiving ring. Air jet holes are opened on the inner wall of the air jet hood.

[0009] The present invention is further configured such that the filter assembly includes a filter cylinder, the bottom of which is movably connected to the inner cavity of the water injection shell, a limiting plate is fixedly connected to the top of the surface of the filter cylinder, a filter screen is provided at the bottom of the filter cylinder, and a water distribution plate is fixedly connected to the inner cavity of the water injection shell. When ammonia is injected into the inner cavity of the filter cylinder, the ammonia flows out through the filter screen at the bottom of the filter cylinder to the nozzle assembly for spraying. The filter screen can filter impurities in the ammonia, and the filter cylinder can be quickly disassembled for cleaning. The filter assembly can prevent impurities from clogging the nozzle assembly.

[0010] The present invention is further configured such that clamping plates are provided on both sides of the top of the mounting plate, and the bottom of the clamping plates abuts against the top of the limiting plate. After the filter cylinder is installed into the inner cavity of the water injection shell, the two clamping plates are rotated respectively to press the limiting plate on the surface of the filter cylinder, thereby fixing the filter cylinder in the inner cavity of the water injection shell.

[0011] The present invention is further configured such that an installation plate is fixedly connected to the top of the filter cylinder, and an installation hole is provided on the surface of the installation plate. One end of the external ammonia supply pipe is inserted into the inner cavity of the filter cylinder, and the flange on the surface of the ammonia supply pipe is connected to the installation plate on the top of the filter cylinder, thereby fixing the ammonia supply pipe and the filter cylinder together.

[0012] The present invention is further configured such that limiting shells are fixedly connected to both sides of the bottom of the mounting plate, and clamping plates are fixedly connected to both sides of the water injection shell. The water injection shell is rotated until the clamping plate on its surface is inserted into the inner cavity of the limiting shell at the bottom of the mounting plate. The water injection shell is fixed to the bottom of the mounting plate by the fixing structure composed of the limiting shell and the clamping plate.

[0013] The present invention is further configured such that a dynamic friction plate is fixedly connected to the bottom of the clamping plate, and a static friction plate is fixedly connected to the bottom of the inner cavity of the limiting shell. The dynamic friction plate moves on the surface of the static friction plate as the clamping plate moves, and the frictional resistance between the dynamic friction plate and the static friction plate prevents the clamping plate from easily sliding in the inner cavity of the limiting shell.

[0014] The present invention is further configured such that an air inlet head is provided on one side of the air inlet ring, and a connecting plate is provided on one side of the air inlet head. One end of the external air supply pipe is inserted into the inner cavity of the air inlet head, and the air inlet head is connected to the flange on the air supply pipe through the connecting plate on one side of the air inlet head, thereby fixing the two together.

[0015] The present invention is further configured such that a sealing cylinder is fixedly connected to the top of the water distribution pan, the top of the sealing cylinder is in close contact with the bottom of the filter cylinder, and the top of the water distribution pan is connected to the bottom of the filter cylinder through the sealing cylinder. The sealing cylinder can prevent the ammonia water flowing out from the bottom of the filter cylinder from leaking.

[0016] The present invention has the following beneficial effects.

[0017] 1. Compared with traditional single-pressure or centrifugal nozzles that rely solely on the pressure or centrifugal force of ammonia water for atomization and have large droplet particles, this utility model sprays ammonia water into different droplet particles through a first, second, and third spray hole with decreasing inner diameter at the bottom of the outer ring, middle body, and inner ring. At the same time, compressed air is introduced through the air receiving ring to form an annular airflow that impacts the droplets, achieving multi-stage atomization. This design can significantly reduce the droplet size of ammonia water, expand the contact area between ammonia water and high-temperature flue gas, and allow ammonia water to be more evenly distributed across the entire cross-section of the flue gas, avoiding the problem of insufficient contact caused by large droplet particles in single nozzles.

[0018] 2. This utility model can reduce ammonia waste and is easy to maintain, reducing the cost and difficulty of denitrification in cement production. On the one hand, multi-stage atomization effectively avoids the phenomenon of large-diameter droplets easily "aggregating" in high-temperature flue gas in traditional single nozzles, allowing more ammonia droplets to fully react with nitrogen oxides and reducing the waste caused by unreacted ammonia being discharged with the flue gas. On the other hand, the nozzle is designed with a detachable and cleanable filter cylinder structure. When maintenance is required, simply rotate the two clamping plates to disengage them from the limiting plate, and the filter cylinder can be moved upwards for disassembly and cleaning. The operation is simple and can reduce equipment downtime for maintenance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a perspective view of a denitrification ammonia water nozzle with multi-stage atomization function used in cement production.

[0021] Figure 2 This is a bottom view schematic diagram of a denitrification ammonia water nozzle with multi-stage atomization function used in cement production.

[0022] Figure 3 This is a partial cross-sectional schematic diagram of a denitrification ammonia water nozzle with multi-stage atomization function used in cement production.

[0023] Figure 4 This is a schematic diagram of the limiting shell and clamping plate in a denitrification ammonia water nozzle with multi-stage atomization function used in cement production.

[0024] Figure 5 This is a schematic diagram of the connection structure between the mounting plate and the filter cartridge in a denitrification ammonia water nozzle with multi-stage atomization function used in cement production.

[0025] In the attached diagram: 1. Mounting plate; 2. Water injection shell; 3. Filter assembly; 4. Nozzle assembly; 401. Mounting head; 402. Outer ring; 403. First spray hole; 404. Intermediate body; 405. Second spray hole; 406. Inner ring; 407. Third spray hole; 408. Air receiving ring; 409. Air jet cover; 410. Air jet hole; 301. Filter cylinder; 302. Limiting plate; 303. Filter screen; 304. Water distribution plate; 5. Limiting shell; 6. Clamping plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1

[0028] Please see Figure 1-5 This utility model relates to a denitrification ammonia water nozzle with multi-stage atomization function for cement production. It includes a mounting plate 1, a water injection shell 2 at the bottom of the mounting plate 1, a filter assembly 3 inside the water injection shell 2, and a nozzle assembly 4 at the bottom of the water injection shell 2. The nozzle assembly 4 includes a mounting head 401, the top of which is fixedly connected to the bottom of the water injection shell 2. An outer ring body 402 is fixedly connected to the edge of the bottom of the mounting head 401, and a first spray hole 403 is opened at the bottom of the outer ring body 402. An intermediate body 404 is provided at the bottom of the mounting head 401 and within the inner cavity of the outer ring body 402. A second water spray hole 405 is provided at the bottom of the intermediate body 404. An inner ring body 406 is provided at the bottom of the mounting head 401 and within the inner cavity of the intermediate body 404. A third water spray hole 407 is provided at the bottom of the inner ring body 406. An air receiving ring 408 is fixedly connected to the bottom of the surface of the water injection shell 2. An air jet cover 409 is fixedly connected to the bottom of the air receiving ring 408. An air jet hole 410 is provided on the inner wall of the air jet cover 409.

[0029] Specifically: Ammonia water is injected into the inner cavity of the water injection shell 2. Due to the certain water pressure of the ammonia water, it is sprayed out through the first water spray hole 403 at the bottom of the outer ring body 402, the second water spray hole 405 at the bottom of the middle body 404, and the third water spray hole 407 at the bottom of the inner ring body 406. Since the inner diameters of the first water spray hole 403, the second water spray hole 405, and the third water spray hole 407 decrease from large to small, the ammonia water can be sprayed out in different droplet particles. At the same time, compressed air is introduced into the inner cavity of the air receiving ring 408. The compressed air forms an annular airflow in the inner cavity of the jet hood 409 to impact the ammonia water droplets, thereby achieving multi-stage atomization.

[0030] Example 2

[0031] Please see Figure 1-5 Based on Embodiment 1, the filter assembly 3 includes a filter cylinder 301. The bottom of the filter cylinder 301 is movably connected to the inner cavity of the water injection shell 2. A limiting plate 302 is fixedly connected to the top surface of the filter cylinder 301. A filter screen 303 is provided at the bottom of the filter cylinder 301. A water distribution plate 304 is fixedly connected to the inner cavity of the water injection shell 2. Pressure plates are provided on both sides of the top of the mounting plate 1. The bottom of the pressure plates is in close contact with the top of the limiting plate 302. The top of the filter cylinder 301 is fixedly connected to... There is an installation plate with installation holes on its surface. Limiting shells 5 are fixedly connected to both sides of the bottom of the installation plate 1. Clamping plates 6 are fixedly connected to both sides of the water injection shell 2. Dynamic friction plates are fixedly connected to the bottom of the clamping plates 6. Static friction plates are fixedly connected to the bottom of the inner cavity of the limiting shell 5. An air inlet head is provided on one side of the air inlet ring 408. A connecting plate is provided on one side of the air inlet head. A sealing cylinder is fixedly connected to the top of the water distribution plate 304. The top of the sealing cylinder is in tight contact with the bottom of the filter cylinder 301.

[0032] Specifically: Ammonia water is injected into the inner cavity of the filter cartridge 301. The ammonia water flows out through the filter screen 303 at the bottom of the filter cartridge 301 to the nozzle assembly 4 for spraying. The filter screen 303 can filter impurities in the ammonia water, and the filter cartridge 301 can be quickly disassembled for cleaning. The filter assembly 3 can prevent impurities from clogging the nozzle assembly 4. After the filter cartridge 301 is installed into the inner cavity of the water injection shell 2, the two clamping plates are rotated respectively to press the limiting plate 302 on the surface of the filter cartridge 301, thereby fixing the filter cartridge 301 in the inner cavity of the water injection shell 2. One end of the external ammonia water supply pipe is inserted into the inner cavity of the filter cartridge 301. The flange on the surface of the ammonia water supply pipe is connected to the mounting plate on the top of the filter cartridge 301, thereby connecting the ammonia water supply pipe to the filter. The cylinders 301 are fixed together. The water injection shell 2 is rotated until the clamping plate 6 on its surface is inserted into the inner cavity of the limiting shell 5 at the bottom of the mounting plate 1. The water injection shell 2 is fixed to the bottom of the mounting plate 1 by the fixing structure composed of the limiting shell 5 and the clamping plate 6. The moving friction plate moves on the surface of the stationary friction plate as the clamping plate 6 moves. The frictional resistance between the moving friction plate and the stationary friction plate prevents the clamping plate 6 from easily sliding in the inner cavity of the limiting shell 5. One end of the external air supply pipe is inserted into the inner cavity of the air inlet. The connection is made to the flange on the air supply pipe through the connecting plate on one side of the air inlet, thus fixing the two together. The top of the water distribution plate 304 is connected to the bottom of the filter cylinder 301 through the sealing cylinder. The sealing cylinder can prevent the ammonia water flowing out from the bottom of the filter cylinder 301 from leaking.

[0033] The working principle of this utility model is as follows: First, the filter cylinder 301 is connected to an external ammonia water supply pipe. After the ammonia water is input into the filter cylinder 301, it is filtered by the filter screen 303 at the bottom of the filter cylinder 301. The filtered ammonia water flows downward into the inner cavity of the water distribution plate 304. The water distribution plate 304 makes the ammonia water flow evenly towards the mounting head 401. Due to the certain water pressure of the ammonia water, the ammonia water passes through the first water spray hole 403 at the bottom of the outer ring body 402, the second water spray hole 405 at the bottom of the middle body 404, and the inner ring body 406. The third water spray hole 407 at the bottom sprays out. Since the inner diameters of the first water spray hole 403, the second water spray hole 405 and the third water spray hole 407 decrease from large to small, ammonia water can be sprayed out in different droplet particles. At the same time, compressed air is introduced into the inner cavity of the air receiving ring 408. The compressed air forms an annular airflow in the inner cavity of the jet hood 409 to impact the ammonia water droplets, realizing multi-stage atomization. Rotate the two clamping plates to make the two clamping plates disengage from the surface of the limiting plate 302, and move the filter cylinder 301 upward for disassembly and cleaning.

[0034] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A denitrification ammonia water nozzle with multi-stage atomization function for cement production, comprising a mounting plate (1), characterized in that: The bottom of the mounting plate (1) is provided with a water injection shell (2), the inner cavity of the water injection shell (2) is provided with a filter assembly (3), and the bottom of the water injection shell (2) is provided with a nozzle assembly (4). The nozzle assembly (4) includes a mounting head (401), the top of which is fixedly connected to the bottom of the water injection shell (2). An outer ring body (402) is fixedly connected to the edge of the bottom of the mounting head (401). A first water spray hole (403) is provided at the bottom of the outer ring body (402). An intermediate body (404) is provided at the bottom of the mounting head (401) and within the inner cavity of the outer ring body (402). The bottom of the intermediate body (404) is open... A second water spray hole (405) is provided. An inner ring body (406) is provided at the bottom of the mounting head (401) and in the inner cavity of the intermediate body (404). A third water spray hole (407) is provided at the bottom of the inner ring body (406). An air receiving ring (408) is fixedly connected to the bottom of the surface of the water injection shell (2). An air jet cover (409) is fixedly connected to the bottom of the air receiving ring (408). An air jet hole (410) is provided on the inner wall of the air jet cover (409).

2. The denitrification ammonia water nozzle with multi-stage atomization function for cement production according to claim 1, characterized in that: The filter assembly (3) includes a filter cylinder (301), the bottom of which is movably connected to the inner cavity of the water injection shell (2), a limiting plate (302) is fixedly connected to the top of the surface of the filter cylinder (301), a filter screen (303) is provided at the bottom of the filter cylinder (301), and a water distribution plate (304) is fixedly connected to the inner cavity of the water injection shell (2).

3. The denitrification ammonia water nozzle with multi-stage atomization function for cement production according to claim 1, characterized in that: Both sides of the top of the mounting plate (1) are provided with clamping plates, and the bottom of the clamping plates is in close contact with the top of the limiting plate (302).

4. The denitrification ammonia water nozzle with multi-stage atomization function for cement production according to claim 2, characterized in that: The top of the filter cartridge (301) is fixedly connected to an installation plate, and the surface of the installation plate is provided with installation holes.

5. The denitrification ammonia water nozzle with multi-stage atomization function for cement production according to claim 1, characterized in that: Limiting shells (5) are fixedly connected to both sides of the bottom of the mounting plate (1), and clamping plates (6) are fixedly connected to both sides of the water injection shell (2).

6. The denitrification ammonia water nozzle with multi-stage atomization function for cement production according to claim 5, characterized in that: The bottom of the clamping plate (6) is fixedly connected to a dynamic friction plate, and the bottom of the inner cavity of the limiting shell (5) is fixedly connected to a static friction plate.

7. The denitrification ammonia water nozzle with multi-stage atomization function for cement production according to claim 1, characterized in that: An air inlet head is provided on one side of the air inlet ring (408), and a connecting plate is provided on one side of the air inlet head.

8. The denitrification ammonia water nozzle with multi-stage atomization function for cement production according to claim 2, characterized in that: A sealing cylinder is fixedly connected to the top of the water distribution pan (304), and the top of the sealing cylinder is in close contact with the bottom of the filter cylinder (301).

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