High-temperature SCR (Selective Catalytic Reduction) denitration system with ash deposition prevention structure

Abstract

The utility model discloses a high-temperature SCR (Selective Catalytic Reduction) denitration system with an ash deposition prevention structure, which relates to the technical field of high-temperature SCR denitration systems and comprises a hearth, a separator, a superheater and a primary economizer, and the separator is arranged on one side of the hearth. According to the high-temperature SCR denitration system with the ash deposition prevention structure, original three-stage coal economizers are all replaced by a fin type from a light pipe type, and a second-stage coal economizer is moved downwards, so that a first-layer catalyst and a second-layer catalyst can be mounted, flue gas does not need to be led out, a boiler does not need to be transformed, and the cost is reduced. By starting the motor, the threaded rod connected with the output end can move the cleaning brush through the displacement block, so that the situation that impurities cover the surface of a catalyst is avoided, and the cleaning effect is improved. Therefore, the high-temperature SCR denitration system has a good anti-inactivation effect in use.

Description

Technical Field

[0001] This utility model relates to the technical field of high-temperature SCR denitrification systems, specifically a high-temperature SCR denitrification system with an anti-ash accumulation structure. Background Technology

[0002] High-temperature SCR denitrification system is a highly efficient denitrification technology for cement kiln flue gas. Its core lies in selective catalytic reduction reaction, which converts nitrogen oxides in flue gas into harmless nitrogen and water. High-temperature SCR denitrification system has the advantages of high denitrification efficiency, low investment, small footprint, and relatively low operating cost, and has been widely used in the cement industry.

[0003] Existing high-temperature SCR denitrification systems often suffer from several drawbacks. The optimal installation location for the SCR catalyst, at its optimal temperature, lies between the first and second-stage economizers. Since the boiler design doesn't pre-design a location for the catalyst, the common practice is to remove the original second-stage economizer, extract the flue gas from this location, construct a new external SCR reactor next to the boiler, and install a new second-stage economizer behind the catalyst. After denitrification and heat exchange, the flue gas is then returned to the boiler from the original second-stage economizer location. However, this process presents several problems: ① significant boiler modifications; ② high project cost; ③ requiring modifications to the boiler's water-cooled walls for flue gas extraction; ④ uneven flow field at the flue gas extraction and return locations, leading to wear and ash accumulation; and ⑤ the large footprint of the external reactor. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature SCR denitrification system with an anti-ash accumulation structure to solve the problem of ash accumulation in high-temperature SCR denitrification systems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature SCR denitrification system with an anti-ash accumulation structure, comprising a furnace, a separator, a superheater, and a primary economizer. A separator is provided on one side of the furnace, a superheater is installed inside the furnace, a primary economizer is installed at the end of the furnace near the superheater, and a secondary economizer is installed at the end of the furnace away from the primary economizer.

[0006] Preferably, a tertiary economizer is installed inside the furnace near the end of the secondary economizer, and an air preheater is installed at the bottom of the tertiary economizer.

[0007] Preferably, a first layer of catalyst is installed between the primary economizer and the secondary economizer, and a second layer of catalyst is provided at one end of the first layer of catalyst.

[0008] Preferably, anti-deactivation mechanisms are provided on both sides of the furnace chamber. The anti-deactivation mechanism includes a fixed frame, a motor, a threaded rod, a guide rod, a displacement block, a cleaning brush, and a sealing cover. Fixed frames are provided on both sides of the furnace chamber.

[0009] Preferably, a motor is installed on one side of the fixed frame, and the output end of the motor is connected to a threaded rod extending into the furnace through a coupling.

[0010] Preferably, a guide rod is provided inside the fixed frame near one end of the threaded rod, and displacement blocks are provided on the surfaces of both the guide rod and the threaded rod.

[0011] Preferably, a cleaning brush is provided at one end of the displacement block, and a sealing cap is provided at the bottom end of the fixing frame.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This high-temperature SCR denitrification system with an anti-ash accumulation structure replaces the original three-stage economizer with a finned type and moves the second-stage economizer downward, increasing the distance between the second-stage and first-stage economizers. This allows for the installation of the first and second catalyst layers without the need for flue gas extraction or boiler modification. As a result, the flue gas can flow smoothly and uniformly inside the furnace, thus avoiding severe wear and ash accumulation problems. By starting the motor, the threaded rod connected to the output end can move the cleaning brush through the displacement block, thereby preventing impurities from covering the catalyst surface. This gives the high-temperature SCR denitrification system a better anti-deactivation effect during use.

[0013] 1. This high-temperature SCR denitrification system with an anti-ash accumulation structure replaces the original three-stage economizer with a finned type and moves the second-stage economizer downward, increasing the distance between the second-stage and first-stage economizers. Sufficient installation space is created between the first and second-stage economizers for the first and second-stage catalysts, avoiding external placement of the catalysts. This eliminates the need for flue gas extraction and boiler modifications, allowing for smoother and more uniform flue gas flow within the furnace, thus preventing severe wear and ash accumulation. Consequently, the high-temperature SCR denitrification system performs well during operation.

[0014] 2. This high-temperature SCR denitrification system with an anti-ash accumulation structure, when the motor is started, drives the threaded rod to rotate. The rotating threaded rod moves the displacement block, which in turn moves the guide rod, ensuring stability during movement. The movement of the displacement block also drives the cleaning brush, which scrapes impurities from the surface of the first catalyst layer. These scraped impurities are collected inside the fixed frame, and then discharged by opening the sealing cover. A similar cleaning brush is installed on the surface of the second catalyst layer, preventing impurities from covering the catalyst surface during use, thus ensuring a better anti-deactivation effect for the high-temperature SCR denitrification system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the main sectional view of the present invention;

[0017] Figure 3 This is a top sectional view of the fixed frame of this utility model;

[0018] Figure 4 This is a front view sectional view of the fixed frame of this utility model.

[0019] In the diagram: 1. Furnace; 2. Separator; 3. Superheater; 4. Primary economizer; 5. Secondary economizer; 6. Tertiary economizer; 7. Air preheater; 8. First layer catalyst; 9. Second layer catalyst; 10. Anti-deactivation mechanism; 1001. Fixing frame; 1002. Motor; 1003. Threaded rod; 1004. Guide rod; 1005. Displacement block; 1006. Cleaning brush; 1007. Sealing cover. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1 , Figure 2 and Figure 3It is understood that this utility model provides a technical solution: a high-temperature SCR denitrification system with an anti-ash accumulation structure, including a furnace 1, a separator 2, a superheater 3, and a primary economizer 4. The separator 2 is provided on one side of the furnace 1. The superheater 3 is installed inside the furnace 1. The primary economizer 4 is installed at the end of the furnace 1 near the superheater 3. The secondary economizer 5 is installed at the end of the furnace 1 away from the primary economizer 4. The tertiary economizer 6 is installed at the end of the furnace 1 near the secondary economizer 5. An air preheater 7 is installed at the bottom of the tertiary economizer 6. A first layer of catalyst 8 is installed between the primary economizer 4 and the secondary economizer 5. A second layer of catalyst 9 is provided at one end of the first layer of catalyst 8.

[0022] See Figure 1 , Figure 2 and Figure 3 It can be seen that by replacing the original three-stage economizer 6 with finned type and moving the second-stage economizer 5 downward, the distance between the second-stage economizer 5 and the first-stage economizer 4 is increased, and sufficient installation space is made between the first-stage economizer 4 and the second-stage economizer 5 to install the first-layer catalyst 8 and the second-layer catalyst 9. This avoids the need for external placement of the first-layer catalyst 8 and the second-layer catalyst 9, and eliminates the need for flue gas extraction and boiler modification. As a result, the flue gas can flow more smoothly and evenly inside the furnace 1, thus avoiding serious wear and ash accumulation problems. Consequently, the high-temperature SCR denitrification system performs better during operation.

[0023] Both sides of the furnace chamber 1 are provided with anti-deactivation mechanisms 10. Each anti-deactivation mechanism 10 includes a fixed frame 1001, a motor 1002, a threaded rod 1003, a guide rod 1004, a displacement block 1005, a cleaning brush 1006, and a sealing cover 1007. Both sides of the furnace chamber 1 are provided with fixed frames 1001. A motor 1002 is installed on one side of the fixed frame 1001. The output end of the motor 1002 is connected to a threaded rod 1003 extending into the furnace chamber 1 via a coupling. A guide rod 1004 is provided inside the fixed frame 1001 near the threaded rod 1003. Displacement blocks 1005 are provided on the surfaces of both the guide rod 1004 and the threaded rod 1003. A cleaning brush 1006 is provided at one end of each displacement block 1005. A sealing cover 1007 is provided at the bottom of the fixed frame 1001.

[0024] See Figure 1 , Figure 2 and Figure 4It can be seen that by starting the motor 1002, the output end of the motor 1002 can drive the threaded rod 1003 to rotate, and the threaded rod 1003 can drive the displacement block 1005 to move when rotating. At the same time, the displacement block 1005 can move on the guide rod 1004, making the displacement block 1005 more stable when moving. When the displacement block 1005 moves, it can drive the cleaning brush 1006 to move, so that the cleaning brush 1006 can scrape the impurities on the surface of the first layer catalyst 8. The scraped impurities can enter the fixed frame 1001 for collection, and then the sealing cover 1007 is opened to discharge the impurities. At the same time, a cleaning brush 1006 is also provided on the surface of the second layer catalyst 9, so that the high temperature SCR denitrification system can avoid impurities covering the catalyst surface during use, thus enabling the high temperature SCR denitrification system to have a better anti-deactivation effect during use.

[0025] In summary, the high-temperature SCR denitrification system is a highly efficient cement kiln flue gas denitrification technology. Its core lies in selective catalytic reduction reaction, which converts nitrogen oxides in the flue gas into harmless nitrogen and water. By replacing the original three-stage economizer 6 with finned type from the bare tube type, and moving the secondary economizer 5 downward, the distance between the secondary economizer 5 and the primary economizer 4 is increased. Sufficient installation space is made between the primary economizer 4 and the secondary economizer 5 to install the first layer catalyst 8 and the second layer catalyst 9. This avoids the need for external placement of the first layer catalyst 8 and the second layer catalyst 9, and eliminates the need for flue gas extraction and boiler modification. As a result, the flue gas can flow smoothly and evenly inside the furnace 1, thus avoiding serious wear and ash accumulation problems. The contents not described in detail in this description are existing technologies known to those skilled in the art.

[0026] 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 high-temperature SCR denitrification system with an anti-ash accumulation structure, comprising a furnace (1), a separator (2), a superheater (3), and a primary economizer (4), characterized in that: A separator (2) is provided on one side of the furnace (1), a superheater (3) is installed inside the furnace (1), a primary economizer (4) is installed at the end of the furnace (1) near the superheater (3), and a secondary economizer (5) is installed at the end of the furnace (1) away from the primary economizer (4).

2. The high-temperature SCR denitrification system with an anti-ash accumulation structure according to claim 1, characterized in that: A third-stage economizer (6) is installed inside the furnace (1) near the second-stage economizer (5), and an air preheater (7) is installed at the bottom of the third-stage economizer (6).

3. The high-temperature SCR denitrification system with an anti-ash accumulation structure according to claim 1, characterized in that: A first layer of catalyst (8) is installed between the first-stage economizer (4) and the second-stage economizer (5), and a second layer of catalyst (9) is provided at one end of the first layer of catalyst (8).

4. The high-temperature SCR denitrification system with an anti-ash accumulation structure according to claim 1, characterized in that: Both sides of the furnace (1) are provided with anti-deactivation mechanisms (10). The anti-deactivation mechanism (10) includes a fixed frame (1001), a motor (1002), a threaded rod (1003), a guide rod (1004), a displacement block (1005), a cleaning brush (1006), and a sealing cover (1007). Both sides of the furnace (1) are provided with fixed frames (1001).

5. A high-temperature SCR denitrification system with an anti-ash accumulation structure according to claim 4, characterized in that: A motor (1002) is installed on one side of the fixed frame (1001), and the output end of the motor (1002) is connected to a threaded rod (1003) extending into the furnace (1) via a coupling.

6. A high-temperature SCR denitrification system with an anti-ash accumulation structure according to claim 5, characterized in that: Inside the fixed frame (1001), a guide rod (1004) is provided at one end near the threaded rod (1003), and displacement blocks (1005) are provided on the surfaces of both the guide rod (1004) and the threaded rod (1003).

7. A high-temperature SCR denitrification system with an anti-ash accumulation structure according to claim 6, characterized in that: A cleaning brush (1006) is provided at one end of the displacement block (1005), and a sealing cap is provided at the bottom end of the fixing frame (1001).

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