Novel SCR (Selective Catalytic Reduction) denitration bypass flue system suitable for chain furnace

Abstract

The utility model discloses a novel SCR (Selective Catalytic Reduction) denitration bypass flue system suitable for a chain furnace, which relates to the technical field of chain furnaces and comprises a flue body, a smoke inlet and a boiler water-cooled wall, the smoke inlet is arranged on one side of the flue body, and the boiler water-cooled wall is arranged in the flue body. The baffle door is mounted in the high-temperature bypass flue opening in the bottom of the chain boiler, so that part of flue gas is not cooled through a boiler water cooling wall, the flue gas directly passes through the high-temperature bypass flue opening in the boiler from the high-temperature side to the low-temperature side, and the temperature of the flue gas at an inlet of the SCR denitration system is increased; therefore, when the SCR denitration bypass flue system is used, a flue can be prevented from being added, a boiler water cooling wall does not need to be transformed, the process is simple, the temperature of flue gas at an inlet of the SCR denitration system is guaranteed, meanwhile, a series of problems that an external high-temperature bypass flue is complex in process, high in material consumption, prone to dust deposition and deformation, high in heat loss and the like are solved, and the SCR denitration bypass flue system is suitable for industrial production. The operation effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of chain grate furnaces, in particular to a novel SCR denitration bypass flue system suitable for chain grate furnaces. Background Art

[0002] With the increasingly stringent environmental protection requirements, the current flue gas NOx emission standard for heating chain furnaces has been changed from ≤200mg / Nm 3 Reduce to ≤100mg / Nm 3 Some areas even require ≤50mg / Nm 3 The SNCR denitrification system can no longer meet the ultra-low emission requirements, and a new SCR denitrification system is needed. In order to ensure the inlet temperature of the SCR denitrification system, a high-temperature bypass flue system needs to be installed.

[0003] Traditional high-temperature bypass flue systems mostly use an off-furnace flue with insulation and an adjustable baffle door. The high-temperature flue gas is led out from behind the furnace, and the water-cooled wall behind the furnace needs to be modified to allow pipes to pass. The off-furnace high-temperature bypass flue has a series of problems such as complex process, high material consumption, easy dust accumulation and deformation of the flue, high heat loss, etc., and the operating effect is poor. Utility Model Content

[0004] The utility model aims to provide a novel SCR denitration bypass flue system suitable for a chain furnace, so as to solve the problem of easy dust accumulation and deformation of the high-temperature bypass flue outside the furnace proposed in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new SCR denitrification bypass flue system suitable for a chain furnace, comprising a flue body, a smoke inlet and a boiler water-cooled wall, a smoke inlet being arranged on one side of the flue body, a boiler water-cooled wall being arranged inside the flue body, a first partition being arranged inside the boiler water-cooled wall, a right arch being arranged on one side of the first partition, and a left arch being arranged on the side of the first partition away from the right arch.

[0006] Preferably, the boiler water-cooled wall and one side of the first partition are both provided with a welded diverter plate, and the angle of the diverter plate is set at 30°.

[0007] Preferably, an inlet for an SCR denitration system is provided on a side of the flue body close to the boiler water-cooled wall, and a second partition is provided at the bottom of the boiler water-cooled wall.

[0008] Preferably, a partition wall is provided on one side of the bottom end of the flue body close to the smoke inlet, and a high-temperature ash cleaning port is opened on one side of the partition wall.

[0009] Preferably, a low-temperature ash cleaning port is provided on a side of the partition wall away from the high-temperature ash cleaning port, and a high-temperature bypass flue port is provided inside the partition wall.

[0010] Preferably, a baffle door is installed inside the high-temperature bypass flue outlet.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the new SCR denitrification bypass flue system suitable for the chain furnace, the traditional high-temperature bypass flue system mostly adopts an external flue, which is easy to accumulate dust and deform, so that the operating effect is poor, and a hole is opened between the high-temperature cleaning port and the low-temperature cleaning port at the bottom of the chain furnace as a high-temperature bypass flue port, and a baffle door is installed inside the high-temperature bypass flue port, so that part of the flue gas does not pass through the boiler water-cooled wall for cooling, and the flue gas directly passes through the high-temperature bypass flue port from the high-temperature side to the low-temperature side in the boiler, so that the flue gas temperature at the inlet of the SCR denitrification system is increased, thereby the SCR denitrification bypass flue system can avoid adding flues when it is used, and there is no need to modify the boiler water-cooled wall, so that the process is simple, while ensuring the inlet flue gas temperature of the SCR denitrification system, it solves a series of problems such as complex process of the external high-temperature bypass flue, high material consumption, easy dust accumulation and deformation of the flue, and high heat loss, and the operating effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the smoke flow structure of the chain furnace before the transformation of the utility model;

[0013] Figure 2 This is a schematic diagram of the smoke flow structure of the chain furnace after the modification of the utility model;

[0014] Figure 3 This is a schematic diagram of the installation position structure of the baffle door of the utility model.

[0015] In the figure: 1. Flue body; 2. Smoke inlet; 3. Boiler water-cooled wall; 4. First partition; 5. Right arch; 6. Left arch; 7. Diverter plate; 8. SCR denitrification system inlet; 9. Second partition; 10. Partition wall; 11. High-temperature cleaning port; 12. Low-temperature cleaning port; 13. High-temperature bypass flue port; 14. Baffle door. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1 , Figure 2 and Figure 3 The utility model provides a technical solution: a new type of SCR denitration bypass flue system suitable for a chain furnace, comprising a flue body 1, a smoke inlet 2 and a boiler water-cooled wall 3, wherein the flue body 1 is provided with a smoke inlet 2 on one side, the flue body 1 is provided with a boiler water-cooled wall 3 inside, the boiler water-cooled wall 3 is provided with a first partition 4 inside, a right arch 5 is provided on one side of the first partition 4, a left arch 6 is provided on the side of the first partition 4 away from the right arch 5, the boiler water-cooled wall 3 and the first partition 4 are both provided with a splitter plate 7 welded and connected, the splitter The angle of the flow plate 7 is set at 30°. An SCR denitrification system inlet 8 is provided on the side of the flue body 1 close to the boiler water-cooled wall 3. A second partition plate 9 is provided at the bottom of the boiler water-cooled wall 3. A partition wall 10 is provided on the side of the bottom end of the flue body 1 close to the smoke inlet 2. A high-temperature cleaning port 11 is provided on one side of the partition wall 10. A low-temperature cleaning port 12 is provided on the side of the partition wall 10 away from the high-temperature cleaning port 11. A high-temperature bypass flue port 13 is provided inside the partition wall 10, and a baffle door 14 is installed inside the high-temperature bypass flue port 13.

[0018] When it comes to specific implementation,

[0019] See also Figure 1 , Figure 2 and Figure 3 It can be seen that by opening a hole between the high-temperature cleaning port 11 and the low-temperature cleaning port 12 at the bottom of the chain furnace as a high-temperature bypass flue port 13, and installing a baffle door 14 inside the high-temperature bypass flue port 13, part of the flue gas does not pass through the boiler water-cooled wall 3 for cooling, and the flue gas directly passes through the high-temperature bypass flue port 13 from the high-temperature side to the low-temperature side in the boiler, so that the flue gas temperature at the inlet 8 of the SCR denitrification system is increased. Therefore, the SCR denitrification bypass flue system can avoid adding flues when it is in use, and there is no need to modify the boiler water-cooled wall 3, so that the process is simple. While ensuring the flue gas temperature at the inlet 8 of the SCR denitrification system, a series of problems such as complex process of the high-temperature bypass flue outside the furnace, high material consumption, easy dust accumulation and deformation of the flue, and high heat loss are solved, and the operating effect is good.

[0020] To sum up, in order to ensure the inlet temperature of the SCR denitrification system, a high-temperature bypass flue system needs to be set up in conjunction with a high-temperature bypass flue system. A hole is opened between the high-temperature cleaning port 11 and the low-temperature cleaning port 12 at the bottom of the chain furnace as a high-temperature bypass flue port 13, so that part of the flue gas does not pass through the boiler water-cooled wall 3 for cooling, and the flue gas directly passes through the high-temperature bypass flue port 13 from the high-temperature side to the low-temperature side in the boiler, so that the flue gas temperature at the inlet 8 of the SCR denitrification system is increased, without adding a flue, and without modifying the boiler water-cooled wall 3. The process is simple, the material consumption is low, the ash accumulation is small, there is no flue deformation and heat loss, and the operating effect is good. The contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0021] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A novel SCR denitration bypass flue system suitable for a chain grate furnace, comprising a flue body (1), a smoke inlet (2) and a boiler water-cooled wall (3), characterized in that: A smoke inlet (2) is arranged on one side of the flue body (1), a boiler water-cooled wall (3) is arranged inside the flue body (1), a first partition (4) is arranged inside the boiler water-cooled wall (3), a right arch (5) is arranged on one side of the first partition (4), and a left arch (6) is arranged on the side of the first partition (4) away from the right arch (5).

2. According to claim 1, a novel SCR denitration bypass flue system suitable for chain furnace is characterized by: The boiler water-cooled wall (3) and one side of the first partition plate (4) are both provided with a welded splitter plate (7), and the angle of the splitter plate (7) is 30°.

3. The novel SCR denitration bypass flue system suitable for chain grate furnace according to claim 1 is characterized in that: An SCR denitration system inlet (8) is provided on one side of the flue body (1) close to the boiler water-cooled wall (3), and a second partition plate (9) is provided at the bottom of the boiler water-cooled wall (3).

4. The novel SCR denitration bypass flue system suitable for chain grate furnace according to claim 3 is characterized in that: A partition wall (10) is provided on one side of the bottom end of the flue body (1) close to the smoke inlet (2), and a high-temperature ash cleaning port (11) is provided on one side of the partition wall (10).

5. According to claim 4, a new type of SCR denitration bypass flue system suitable for chain furnace is characterized in that: A low-temperature ash cleaning port (12) is provided on a side of the partition wall (10) away from the high-temperature ash cleaning port (11), and a high-temperature bypass flue port (13) is provided inside the partition wall (10).

6. A novel SCR denitration bypass flue system suitable for a chain furnace according to claim 5, characterized in that: A baffle door (14) is installed inside the high-temperature bypass flue port (13).

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