A dust cleaning system for cement kiln flue gas denitration

Abstract

The application discloses a dust cleaning system for cement kiln flue gas denitration, which comprises a kiln body and a dust cleaning system, a plurality of catalyst modules are arranged in the kiln body from top to bottom, the catalyst module comprises a plurality of catalyst units, the catalyst unit comprises a plurality of channels through which gas passes, the dust cleaning system comprises a plurality of dust cleaning units, the dust cleaning unit comprises a soot blowing mechanism and a cleaning mechanism, the soot blowing mechanism comprises a plurality of soot blowing assemblies arranged above the catalyst unit, and the soot blowing assembly comprises a soot blowing pipe. The application can automatically clean the catalyst surface and the channel, has excellent dust cleaning effect, is high in working efficiency, reduces the work load of workers and is low in labor cost.

Description

Technical Field

[0001] This invention belongs to the field of flue gas denitrification technology, specifically relating to a dust removal system for denitrification of flue gas in cement kilns. Background Technology

[0002] Currently, selective catalytic reduction (SCR) denitrification technology is commonly used in cement industry kiln tail gas treatment to control nitrogen oxides and ammonia escape. SCR denitrification technology is the most efficient and promising denitrification technology, and has become a widely adopted method for efficient NOx control across various industries both domestically and internationally. X The primary choice for emissions control. As a core component of the denitrification system, protecting the catalyst and extending its service life has become an important issue in the cement SCR denitrification industry.

[0003] SCR denitrification technology generally uses honeycomb catalysts or plate catalysts. Both types of catalysts commonly suffer from catalyst clogging under high dust concentrations in the flue gas. While the current project construction status shows that the dust removal system effectively ensures the normal use of the catalyst, manual cleaning is still occasionally required during maintenance to ensure the catalyst is in optimal working condition. This involves a heavy workload and high labor costs, and can only clean dust from the catalyst surface, failing to remove accumulated ash from the catalyst channels, resulting in a short catalyst lifespan and low denitrification efficiency. Therefore, it is necessary to research a dust removal system for denitrification of cement kiln tail gas. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a cleaning system for denitrification of cement kiln flue gas, which can automatically clean both the catalyst surface and pores, achieving excellent cleaning results, reducing the workload of workers, and lowering labor costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A dust removal system for denitrification of cement kiln flue gas includes a kiln body and a dust removal system. Multiple catalyst modules are installed inside the kiln body from top to bottom. Each catalyst module includes multiple catalyst units, and each catalyst unit includes multiple channels for gas passage. The dust removal system includes multiple dust removal units, each dust removal unit including a dust blowing mechanism and a cleaning mechanism. The cleaning mechanism includes a fixed plate, multiple cleaning rods, and a lifting assembly for driving the cleaning rods up and down. Each cleaning rod has a storage cavity and a moving channel connecting the storage cavity to the top of the cleaning rod. A sludge scraping assembly is installed inside the storage cavity. The sludge scraping assembly includes a traction rod and scrapers connected to both sides of the traction rod via a first spring. The bottom end of the traction rod is connected to the bottom wall of the storage cavity via a second spring. A pull rod is fixedly connected to the top end of the traction rod. The dust blowing mechanism includes multiple dust blowing components positioned above the catalyst units, each dust blowing component including a dust blowing pipe.

[0007] Preferably, the lower two sides of the aforementioned cleaning rod are provided with openings that communicate with the storage cavity. When the second spring is in a compressed state, the scraper moves downward and the first spring extends, causing the scraper to pop out through the opening.

[0008] Preferably, the top end of the aforementioned cleaning rod is vertically connected to the first lifting rod via a vertical rod, and both sides of the top end of the first lifting rod are connected to the first driving cylinder via the first telescopic rod. The first driving cylinder drives the cleaning rod to move up and down to clean the pores of the catalyst unit.

[0009] Preferably, the top end of the aforementioned pull rod extends out of the top end of the moving channel and is fixedly connected to the second lifting rod. Both sides of the top end of the second lifting rod are connected to the second drive cylinder fixed to the bottom of the first lifting rod through the second telescopic rod. The pull rod is moved up and down by the second drive cylinder to realize the ejection and retraction of the scraper.

[0010] Preferably, the aforementioned first drive cylinder is slidably connected to the bottom of the fixed plate to drive the cleaning rod to move left and right, thereby cleaning the surface of the catalyst unit.

[0011] Preferably, the aforementioned second lifting rod has a first airflow channel inside, the pull rod has a second airflow channel communicating with the first airflow channel inside, the pull rod has a plurality of first air holes on its side wall, the cleaning rod has second air holes communicating with the moving channel on both sides, and the bottom of the blowing pipe is connected to the first airflow channel of the second lifting rod through a flexible hose.

[0012] Preferably, a plurality of spray guns are provided on the side of the aforementioned soot blowing pipe near the catalyst unit, and one side of the soot blowing pipe is connected to an air supply duct.

[0013] Preferably, the aforementioned first spring is fixedly connected to the traction rod at a downward tilt angle of 20~45°.

[0014] Preferably, the outer wall and bottom of the aforementioned cleaning rod are provided with cleaning brushes, and the front end of the scraper is provided with multiple sharp teeth.

[0015] Preferably, connecting blocks are fixed on both sides above the aforementioned catalyst unit, and the two connecting blocks are respectively connected to the two ends of the fixing plate by bolts.

[0016] The advantages of this invention are: its simple structure and ease of use; the cleaning rod can clean the channels of the catalyst unit, and the sharp teeth on the scraper can scrape off the accumulated ash in the channels; at the same time, the air source is sent into the channels through the pull rod and the cleaning rod, which can effectively blow away the cleaned ash and discharge it from the kiln; the left and right movement of the cleaning rod can clean the surface of the catalyst unit; this invention can automatically clean both the catalyst surface and the channels, with excellent cleaning effect, high work efficiency, reduced workload of workers, and low labor costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the dust removal system in this invention;

[0019] Figure 3 This is a schematic diagram of the cleaning rod in this invention;

[0020] Figure 4 yes Figure 3 A magnified view of a portion of point A (in a non-operational state);

[0021] Figure 5 yes Figure 4 A schematic diagram showing the device in operation;

[0022] Figure 6 This is a schematic diagram of the cleaning rod in this invention.

[0023] The meanings of the reference numerals in the attached diagram are as follows: 1. Kiln body; 2. Catalyst unit; 2.1. Channel; 3. Fixing plate; 4. Cleaning rod; 4.1. Storage chamber; 4.2. Moving channel; 4.3. Opening; 4.4. Second air hole; 4.5. Cleaning brush; 5. Traction rod; 6. First spring; 7. Scraper; 7.1. Teeth; 8. Second spring; 9. Pull rod; 10. Soot blowing pipe; 11. First lifting rod; 12. First drive cylinder; 13. Second lifting rod; 14. Second drive cylinder; 15. Spray gun; 16. Connecting block; 17. Hose. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] See Figure 1The present invention discloses a dust removal system for denitrification of cement kiln flue gas, comprising a kiln body 1 and a dust removal system. Multiple catalyst modules are installed inside the kiln body 1 from top to bottom. Each catalyst module includes multiple catalyst units 2, and each catalyst unit 2 includes multiple channels 2.1 for gas to pass through. The dust removal system includes multiple dust removal units, each dust removal unit including a soot blowing mechanism and a cleaning mechanism.

[0026] See Figure 2 The cleaning mechanism includes a fixed plate 3, multiple cleaning rods 4, and a lifting assembly that drives the cleaning rods 4 to move up and down. Cleaning brushes 4.5 are provided on the outer wall and bottom of the cleaning rods 4. A first lifting rod 11 is vertically connected to one side of the top of the cleaning rod 4 via a vertical rod. A first driving cylinder 12 is connected to both sides of the top of the first lifting rod 11 via a first telescopic rod. The first driving cylinder 12 drives the cleaning rods 4 to move up and down to clean the channels 2.1 of the catalyst unit 2. Connecting blocks 16 are fixed to both sides of the upper part of the catalyst unit 2. The two connecting blocks 16 are connected to the two ends of the fixed plate 3 by bolts. The first driving cylinder 12 is slidably connected to the bottom of the fixed plate 3 to drive the cleaning rods 4 to move left and right, thus cleaning the surface of the catalyst unit 2. The sliding connection method uses a slider, slide rail, and sliding motor technology, which is a commonly used technical means in the prior art and will not be described in detail.

[0027] See Figures 3-6 The cleaning rod 4 has a storage cavity 4.1 inside and a moving channel 4.2 connecting the storage cavity 4.1 and the top of the cleaning rod 4. The storage cavity 4.1 is equipped with a sludge scraping assembly, which includes a traction rod 5 and scrapers 7 connected to both sides of the traction rod 5 by a first spring 6. The first spring 6 is fixedly connected to the traction rod 5 at a downward tilt angle of 20~45° to facilitate the ejection and retraction of the scrapers 7. The bottom end of the traction rod 5 is connected to the bottom wall of the storage cavity 4.1 by a second spring 8, and the top end of the traction rod 5 is fixedly connected to a pull rod 9.

[0028] Both sides of the lower part of the cleaning rod 4 are provided with openings 4.3 that communicate with the storage cavity 4.1. When the second spring 8 is in a compressed state, the scraper 7 moves downward, the first spring 6 extends, and the scraper 7 pops out through the openings 4.3. The front end of the scraper 7 is provided with multiple sharp teeth 7.1, which can clean the accumulated dust in the channel 2.1. The top of the pull rod 9 extends out of the top of the moving channel 4.2 and is fixedly connected to the second lifting rod 13. Both sides of the top of the second lifting rod 13 are connected to the second drive cylinder 14 fixed to the bottom of the first lifting rod 11 through the second telescopic rod. The second drive cylinder 14 drives the pull rod 9 to move up and down, so as to realize the pop-out and retraction of the scraper 7. After cleaning, the second drive cylinder 14 drives the pull rod 9 to move upward, the pull rod 9 drives the traction rod 5 to move upward, and then the first spring 6 retracts the scraper 7 into the storage cavity 4.1. Because the outer diameter of the cleaning rod 4 corresponds to the inner diameter of the channel 2.1, if the scraper 7 pops out first, it will affect the cleaning rod 4 entering the channel 2.1. During operation, the scraper 7 should be popped out after the cleaning rod 4 has entered the channel 2.1.

[0029] The soot blowing mechanism includes multiple soot blowing components positioned above the catalyst unit 2, each including a soot blowing pipe 10. The second lifting rod 13 has a first airflow channel inside, and the pull rod 9 has a second airflow channel communicating with the first airflow channel. Multiple first air holes are located on the side wall of the pull rod 9. The cleaning rod 4 has second air holes 4.4 on both sides communicating with the moving channel 4.2. The bottom of the soot blowing pipe 10 is connected to the first airflow channel of the second lifting rod 13 via a flexible hose 17. Air enters the first airflow channel through the hose 17, then passes through the second airflow channel, the first air holes, and the second air holes 4.4, blowing air towards the side wall of the orifice 2.1 to clean the accumulated ash in the orifice 2.1. Using the flexible hose 17 avoids affecting the movement of the first lifting rod 11 and the second lifting rod 12. Multiple spray guns 15 are located on the side of the soot blowing pipe 10 closest to the catalyst unit 2. One side of the soot blowing pipe 10 is connected to an air supply pipe, allowing for the cleaning of the surface of the catalyst unit 2.

[0030] The kiln body 1 is also equipped with a feed inlet, an air outlet, and an operating door, through which workers can enter and exit to install and disassemble the cleaning mechanism. There are multiple catalyst units 2 in the kiln body 1, each capable of housing a corresponding cleaning mechanism. The diameter of the cleaning rod 4 corresponds to the diameter of the channel 2.1 of the catalyst unit 2, facilitating its better entry into the channel 2.1.

[0031] To better illustrate the present invention, its working process is described in detail below:

[0032] When cleaning the catalyst unit 2 is required, the cement kiln operation is first suspended. The worker installs the cleaning mechanism in the kiln body 1. After preparation, the cleaning rod 4 is moved left and right by the sliding component to clean the ash on the surface of the catalyst unit 2. Then, the first drive cylinder 12 is turned on to send the cleaning rod 4 into the corresponding channel 2.1 of the catalyst unit 2, and the cleaning rod 4 is moved up and down to clean the inner wall of the channel 2.1. At the same time, the second drive cylinder 14 is turned on to move the pull rod 9 downward. The pull rod 9 drives the traction rod 5 downward to compress the second spring 8. During the downward movement, the scraper 7 pops out through the opening 4.3 and moves up and down with the cleaning rod 4 to scrape off the ash on the inner wall of the channel 2.1. The air source enters the kiln body 1 through the ash blowing pipe 10 to blow the catalyst unit 2. At the same time, the air source enters the first airflow channel through the hose 17, and then blows through the second airflow channel, the first air hole and the second air hole 4.4 to the side wall of the channel 2.1 to blow away the ash in the channel 2.1.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A dust removal system for denitrification of cement kiln flue gas, comprising a kiln body (1) and a dust removal system, wherein multiple catalyst modules are installed inside the kiln body (1) from top to bottom, each catalyst module comprising multiple catalyst units (2), each catalyst unit (2) comprising multiple channels (2.1) for gas to pass through, characterized in that, The dust removal system includes multiple dust removal units. Each dust removal unit includes a dust blowing mechanism and a sweeping mechanism. The sweeping mechanism includes a fixed plate (3), multiple cleaning rods (4), and a lifting assembly that drives the cleaning rods (4) to move up and down. The cleaning rods (4) have a storage cavity (4.1) and a moving channel (4.2) connecting the storage cavity (4.1) and the top of the cleaning rods (4). The storage cavity (4.1) has a sludge scraping assembly. The sludge scraping assembly includes a traction rod (5) and scrapers (7) connected to both sides of the traction rod (5) by a first spring (6). The bottom end of the traction rod (5) is connected to the bottom wall of the storage cavity (4.1) by a second spring (8). The top end of the traction rod (5) is fixedly connected to a pull rod (9). The dust blowing mechanism includes multiple dust blowing assemblies arranged above the catalyst unit (2). The dust blowing assembly includes a dust blowing pipe (10). The cleaning rod (4) has openings (4.3) on both sides of its lower part that are connected to the storage cavity (4.1). When the second spring (8) is in a compressed state, the scraper (7) moves downward and the first spring (6) extends, causing the scraper (7) to pop out through the opening (4.3).

2. The ash removal system for denitrification of cement kiln flue gas according to claim 1, characterized in that, The top of the cleaning rod (4) is vertically connected to the first lifting rod (11) via a vertical rod. The top of the first lifting rod (11) is connected to the first driving cylinder (12) via a first telescopic rod on both sides. The cleaning rod (4) is moved up and down by the first driving cylinder (12) to clean the channels (2.1) of the catalyst unit (2).

3. The ash removal system for denitrification of cement kiln flue gas according to claim 2, characterized in that, The top of the pull rod (9) extends out of the top of the moving channel (4.2) and is fixedly connected to the second lifting rod (13). The top two sides of the second lifting rod (13) are connected to the second driving cylinder (14) fixed to the bottom of the first lifting rod (11) through the second telescopic rod. The pull rod (9) is driven to move up and down through the second driving cylinder (14) to realize the ejection and retraction of the scraper (7).

4. A dust removal system for denitrification of cement kiln flue gas according to claim 2, characterized in that, The first drive cylinder (12) is slidably connected to the bottom of the fixed plate (3) to drive the cleaning rod (4) to move left and right, thereby cleaning the surface of the catalyst unit (2).

5. A dust removal system for denitrification of cement kiln flue gas according to claim 3, characterized in that, The second lifting rod (13) has a first airflow channel inside, the pull rod (9) has a second airflow channel inside that communicates with the first airflow channel, the pull rod (9) has a plurality of first air holes on its side wall, the cleaning rod (4) has second air holes (4.4) on both sides that communicate with the moving channel (4.2), and the bottom of the blowing pipe (10) is connected to the first airflow channel of the second lifting rod (13) through a hose (17).

6. A dust removal system for denitrification of cement kiln flue gas according to claim 1, characterized in that, The blowing pipe (10) is provided with multiple spray guns (15) on the side near the catalyst unit (2), and one side of the blowing pipe (10) is connected to the air supply pipe.

7. A dust removal system for denitrification of cement kiln flue gas according to claim 1, characterized in that, The first spring (6) is fixedly connected to the traction rod (5) at a downward tilt angle of 20~45°.

8. A dust removal system for denitrification of cement kiln flue gas according to claim 1, characterized in that, The cleaning rod (4) is provided with cleaning brushes (4.5) on its outer side wall and bottom, and the front end of the scraper (7) is provided with multiple sharp teeth (7.1).

9. A dust removal system for denitrification of cement kiln flue gas according to claim 1, characterized in that, Connecting blocks (16) are fixed on both sides above the catalyst unit (2), and the two connecting blocks (16) are respectively connected to the two ends of the fixing plate (3) by bolts.

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