A flue gas treatment system for a flash furnace

Abstract

The utility model discloses a kind of flue gas treatment systems of flash furnace, it is related to metal smelting technical field, including smoke chamber, steel platform, several flue gas pipeline branches, flue gas pipeline main road, flap valve and ash removal pipe, wherein flue gas pipeline main road is obliquely arranged in the side of flash furnace from left to right, the top of the smoke chamber of flash furnace water quenching pool is fixedly welded steel platform, and steel platform and flue gas pipeline main road position correspond;The one end of the flue gas pipeline branch is fixed and communicated with flue gas pipeline main road, the other end is connected with flap valve, and the flap type flue gas valve is communicated with smoke chamber after passing through steel platform;The lowest point of flue gas pipeline main road is communicated and arranged at the top of ash removal pipe, and the bottom is immersed in water quenching pool.The utility model improves negative pressure stability by oblique flue gas pipeline main road, setting flap valve independent control branch;Dust is concentrated in valve body and ash removal pipe, easy to clean, reduce corrosion and maintenance cost, enhance flue gas treatment system structure safety and operation reliability.

Description

Technical Field

[0001] This utility model relates to the field of flash furnace technology, specifically to a flue gas treatment system for a flash furnace. Background Technology

[0002] The molten copper emitted from the flash furnace is cooled using nitrogen granulation and water spraying. Due to the blasting process and the high-temperature, high-acidity flue gas environment, the water-quenching pool hoods in the flash furnace flue gas treatment system are prone to corrosion and severe localized thinning. Specifically, the three-way flues above hoods #1, #2, #3, and #4 show severe corrosion and perforation, weakening their structural strength. This not only reduces the overall safety of the equipment but also increases operational risks. Furthermore, due to limitations imposed by emission conditions, routine repairs to the slag pool and its hoods have become a constant maintenance requirement, resulting in extremely high maintenance frequency and an increasing number of air leaks in the hoods and flues, exacerbating the flue gas escape problem. Under these circumstances, the escaped flue gas accelerates the corrosion rate of the steel structures attached to the water-quenched slag pool, with some beams and columns thinning by more than 30%, posing significant structural safety hazards.

[0003] Traditional flash furnace flue gas treatment systems feature an inclined flue design with upper and lower bell valves for isolation. While this approach meets production requirements to some extent, it also presents several drawbacks. First, the traditional bell valves increase the overall height of the flue, hindering on-site operation and maintenance. Second, routine cleaning and maintenance often involve hazardous tasks, particularly since cleaning is often limited by location and cannot be completed thoroughly in a short time, leading to frequent material accumulation in the flue and severely impacting the system's negative pressure performance. Furthermore, the maintenance of the flue and its steel structure requires scaffolding, consuming significant manpower and resources and greatly increasing maintenance costs. Therefore, there is an urgent need to optimize and improve existing flash furnace flue gas treatment systems to address issues such as corrosion, leakage, maintenance difficulties, and high safety risks. Summary of the Invention

[0004] In view of the shortcomings of existing flash furnace flue gas treatment systems, such as severe flue corrosion, insufficient structural strength, frequent and costly maintenance, and safety hazards, this utility model provides a flash furnace flue gas treatment system that can achieve stable flue gas flow rate, is safe to use, effectively reduces maintenance costs, and is convenient to use.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A flue gas treatment system for a flash furnace includes a smoke collection chamber, a steel platform, several branch flue gas pipes, a main flue gas pipe, a flap valve, and an ash discharge pipe. The main flue gas pipe is inclined from left to right and is located on the side of the flash furnace. The top of the smoke collection chamber of the flash furnace's water quenching tank is fixedly welded to the steel platform, and the steel platform corresponds to the position of the main flue gas pipe. One end of each branch flue gas pipe is fixedly connected to the main flue gas pipe, and the other end is connected to the flap valve. The flap valve passes through the steel platform and connects to the smoke collection chamber. The top of the ash discharge pipe is connected to the lowest point of the main flue gas pipe, and the bottom is immersed in the water quenching tank.

[0006] Furthermore, the flap valve includes a valve body with through holes on both its upper and lower surfaces. A V-shaped rod is rotatably mounted on the upper left side of the valve body, and a cylinder is fixedly mounted in the middle. The fixed end of the cylinder extends outward through the valve body, and the telescopic end of the cylinder is rotatably connected to one end of the V-shaped rod. The other end of the V-shaped rod is fixedly connected to a flap that blocks the top through hole. The flap valve employs a V-shaped rod and cylinder linkage structure, using cylinder drive to open and close the flap, controlling the flow of flue gas. It features a compact structure, reliable operation, improved opening and closing efficiency and sealing performance, reduced flue gas leakage in the flue gas treatment system, and facilitates remote operation.

[0007] Furthermore, an openable manhole is fixedly provided on the valve body below the cylinder. Operators can view the internal condition of the valve body through the manhole, and can periodically inspect the internal condition of the valve body and clean away accumulated dust and grime, improving maintenance convenience and cleaning efficiency, reducing the risk of blockage, and ensuring the stable operation of the flue gas treatment system.

[0008] Furthermore, a slide gate valve is installed on the ash discharge pipe. The slide gate valve facilitates control of dust emissions, is simple to operate, has good sealing performance, effectively prevents flue gas leakage, and also facilitates regular cleaning and maintenance of the flue gas treatment system, ensuring overall stable operation. Furthermore, the main flue gas pipeline is equipped with a flange in the middle of the first and second branch flue gas pipelines on the left side of the main flue gas pipeline, and a pipeline compensator is connected through the flange. The pipeline compensator facilitates the absorption of thermal stress and displacement, reduces the risk of deformation of the main flue gas pipeline, extends the service life of the main flue gas pipeline, and also improves the stability and safety of the system.

[0009] Furthermore, the angle between the main flue gas duct and the horizontal position of the main flue gas duct 4 is 5°–30°. This 5°–30° angle design from the horizontal plane to the main flue gas duct facilitates flue gas flow and natural dust settling, reducing the risk of material accumulation and blockage. It also facilitates the collection of settled dust to the ash discharge pipe, improving cleaning efficiency, reducing maintenance difficulty, and thus extending the equipment's service life.

[0010] Furthermore, the flash furnace is evenly provided with several triangular supports on its side, and each triangular support has a support block on its top that matches the main flue gas duct. The triangular supports with support blocks are used to support the main flue gas duct, enhancing the overall stability and load-bearing capacity of the main flue gas duct, preventing deformation of the main flue gas duct due to gravity or thermal stress, and improving the operational safety and service life of the flue gas treatment system.

[0011] Furthermore, the gas pipeline branches, main flue gas pipeline, flap valve, and ash discharge pipe are all made of 304 stainless steel, and all connections are fully welded to prevent corrosion and leakage. The 304 stainless steel material and the fully welded connections minimize corrosion and leakage, extending the service life of the flue gas treatment system.

[0012] How to use this utility model: One end of the main flue gas pipeline is closed, while the other end connects to the factory's flue gas filtration equipment. The number of water quenching tanks corresponds one-to-one with the number of flue gas pipeline branches. Each flue gas pipeline branch is controlled by a flap valve. The flue gas inlet and outlet of a single water quenching tank's smoke collection chamber is controllable, effectively preventing cross-contamination and leakage. After the flue gas is generated from the smoke collection chamber of the water quenching tank, it first passes through the flap valve and the flue gas pipeline branch, then enters the main flue gas pipeline, and finally reaches the end of the main flue gas pipeline before entering the next treatment equipment. During this process, the flue gas settles on the flap valve of the flue gas pipeline branch and the ash discharge pipe at the lowest point of the main flue gas pipeline. When cleaning the settled dust, the staff can clean and maintain the flap valve and ash discharge pipe from the steel platform.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. This utility model, by tilting the main flue gas pipeline to the side of the flash furnace, fixing and welding a steel platform to the top of the smoke collection chamber, and installing flap valves on each branch of the flue gas pipeline for independent control, effectively avoids cross-contamination and leakage of smoke, and improves the overall negative pressure stability; flue gas dust is concentrated at the flap valves and ash discharge pipes, which facilitates centralized collection and cleaning, reduces material accumulation inside the flue, thereby reducing the corrosion rate, extending the service life of the flash furnace flue gas treatment system, and reducing maintenance frequency and costs; the flap valve has a compact structure, optimizes the flue layout height, improves operational safety and maintenance convenience, and at the same time reduces flue gas escape, enhancing the overall structural safety and operational reliability.

[0014] 2. The flap valve of this utility model adopts a V-shaped rod and cylinder linkage structure, which ensures reliable opening and closing action, good sealing performance, reduces flue gas leakage, and facilitates remote control. The valve body is equipped with a manhole for easy inspection and cleaning of ash accumulation, improving maintenance efficiency. The ash discharge pipe is equipped with a slide valve, which is easy to operate, has strong sealing performance, facilitates dust discharge and regular maintenance, and helps to improve the operational stability and safety of the flash furnace flue gas treatment system and extend the service life of the pipeline.

[0015] 3. The main flue gas pipeline of this utility model adopts an inclination angle of 5°-30°, which is conducive to flue gas flow and dust settling, reduces material accumulation and blockage, improves ash removal efficiency, and thus reduces the probability of pipeline corrosion and damage; the pipeline compensator is connected by flanges, which can absorb thermal stress and displacement, reduce the risk of deformation and damage, and improve service life; a triangular support with a support block is set below the main flue gas pipeline to evenly distribute the support force, enhance the overall load-bearing capacity and operational safety, and effectively extend the service life of the flash furnace flue gas treatment system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the plan layout of this utility model.

[0017] Figure 2 This is a utility model Figure 1 Schematic diagram of the cross-sectional structure of section I-I.

[0018] Figure 3 This is a schematic diagram of the internal structure of the flap valve of this utility model in the closed state.

[0019] Figure 4 This is a schematic diagram of the internal structure of the flap valve of this utility model in the open state.

[0020] Figure 5 This is a structural schematic diagram of the triangular bracket of this utility model.

[0021] Attached image labels: Smoke collection chamber—1, steel platform—2, flue gas duct branch—3, flue gas duct main—4, duct compensator—5, flap valve—6, valve body—61, V-shaped rod—62, cylinder—63, flap—64, manhole—65, ash discharge pipe—7, triangular bracket—8. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Example 1: A flue gas treatment system for a flash furnace includes a smoke collection chamber 1, a steel platform 2, several branch flue gas pipes 3, a main flue gas pipe 4, a flap valve 6, and an ash discharge pipe 7. The main flue gas pipe 4 is inclined from left to right on the side of the flash furnace. The top of the smoke collection chamber 1 of the flash furnace water quenching tank is fixedly welded to the steel platform 2, and the position of the steel platform 2 corresponds to that of the main flue gas pipe 4. One end of each branch flue gas pipe 3 is fixedly connected to the main flue gas pipe 4, and the other end is connected to the flap valve 6. The flap valve 6 passes through the steel platform 2 and connects to the smoke collection chamber 1. The top of the ash discharge pipe 7 is connected to the lowest point of the main flue gas pipe 4, and the bottom is immersed in the water quenching tank.

[0024] One end of the main flue gas pipeline 4 is closed, and the other end is connected to the factory's flue gas filtration equipment. The number of water quenching tanks corresponds one-to-one with the number of flue gas pipeline branches 3. Each flue gas pipeline branch 3 is controlled by a flap valve 6. The flue gas inlet and outlet of a single water quenching tank smoke collection chamber 1 is controllable, effectively avoiding cross-contamination and leakage. After the flue gas is generated from the smoke collection chamber 1 of the water quenching tank, it first passes through the flap valve 6 and the flue gas pipeline branch 3, then enters the main flue gas pipeline 4, and finally enters the next treatment equipment after reaching the end of the main flue gas pipeline 4. During this process, the flue gas settles on the flap valve 6 of the flue gas pipeline branch 3 and the ash discharge pipe 7 at the lowest point of the main flue gas pipeline 4. When cleaning the settled dust, the staff can clean and maintain the flap valve 6 and the ash discharge pipe 7 from the steel platform 2.

[0025] Example 2: Unlike Example 1, the flap valve 6 includes a valve body 61 with through holes on both its upper and lower surfaces. A V-shaped rod 62 is rotatably mounted on the upper left side of the valve body 61, and a cylinder 63 is fixedly mounted in the middle. The fixed end of the cylinder 63 extends outward through the valve body 61, and the telescopic end of the cylinder 63 is rotatably connected to one end of the V-shaped rod 62. The other end of the V-shaped rod 62 is fixedly connected to a flap 64 that blocks the top through hole. The flap valve 6 employs a linkage structure between the V-shaped rod 62 and the cylinder 63. The cylinder 63 drives the flap 64 to open and close, controlling the flow of flue gas. This design is compact, reliable, and improves the opening and closing efficiency and sealing performance of the flap valve 6, reducing flue gas leakage in the flue gas treatment system and facilitating remote operation.

[0026] The main flue gas pipeline 4 is equipped with a flange between the first and second branch flue gas pipelines 3 on the left side, and a pipeline compensator 5 is connected through the flange. The pipeline compensator 5 facilitates the absorption of thermal stress and displacement, reduces the risk of deformation of the main flue gas pipeline 4, extends the service life of the main flue gas pipeline 4, and also improves the stability and safety of the flue gas treatment system.

[0027] The flash furnace has several triangular supports 8 evenly distributed on its side, and each triangular support 8 has a support block on its top that matches the main flue gas duct 4. The triangular support 8 with the support block is used to support the main flue gas duct 4, enhance the overall stability and load-bearing capacity of the main flue gas duct 4, prevent deformation of the main flue gas duct 4 due to gravity or thermal stress, and improve the operational safety and service life of the flue gas treatment system.

[0028] Example 3: Unlike Example 2, an openable manhole 65 is fixedly provided on the valve body 61 below the cylinder 63. Workers can view the internal condition of the valve body 61 through the manhole 65, and can periodically check the internal condition of the valve body 61 and clean the accumulated dust and ash, improving maintenance convenience and cleaning efficiency, reducing the risk of blockage, and ensuring the stable operation of the flue gas treatment system.

[0029] The ash discharge pipe 7 is equipped with a slide gate valve. The slide gate valve facilitates control of dust emissions, is simple to operate, has good sealing performance, effectively prevents flue gas leakage, and also facilitates regular cleaning and maintenance of the flue gas treatment system, ensuring overall stable operation. The angle between the main flue gas duct 4 and the horizontal plane is 5°–30°. This 5°–30° angle design facilitates flue gas flow and natural dust settling, reducing the risk of material accumulation and blockage. It also facilitates the collection of settled dust to the ash discharge pipe 7, improving cleaning efficiency, reducing maintenance difficulty, and thus extending the service life of the flue gas treatment system.

[0030] Example 4: The difference from Example 3 is that the top of the smoke collection chamber 1 is provided with a pre-embedded plate weld and a pre-embedded rebar; the steel platform 2 is formed by splicing and welding I-beams, channel steel, and steel plates, and the steel platform 2 is welded and fixed on the pre-embedded plate and the pre-embedded rebar after splicing; the steel plates, pre-embedded plate welds, and pre-embedded rebar are made of 304 stainless steel, and the I-beams and channel steel are painted after being welded above the steel platform to reduce corrosion.

[0031] The gas pipeline branch 3, flue gas pipeline main 4, flap valve 6, and ash discharge pipe 7 are all made of 304 stainless steel, and all connections are fully welded to prevent corrosion and leakage. The use of 304 stainless steel and fully welded connections minimizes corrosion and leakage, extending service life. The flash furnace is also equipped with a pipe maintenance platform 9 on its side. The pipe maintenance platform 9 is composed of I-beams and steel plates, and is supported at the bottom by a triangular bracket 8. The pipe maintenance platform is used for personnel to clean the flue gas pipes, facilitating the maintenance and cleaning of the flue gas treatment system.

[0032] The bottom of the ash discharge pipe 7 is immersed in the water quenching pool for about 300 mm.

[0033] Example 5: The difference from Example 1 is that the daily single-outlet emission volume and maximum flue gas velocity are statistically analyzed. The main flue gas duct diameter (4) is taken as the number of most frequently used outlets for emission. Where d is the pipe diameter, Q is the flue gas flow rate, and v is the flue gas velocity; then the branch pipe diameter and the main pipe diameter are calculated. The diameters of both the main flue gas pipeline 4 and the branch flue gas pipeline 3 are larger than the calculated values. This design has the ability to buffer high-temperature flue gas and is beneficial to improving production stability. Each branch flue gas pipeline 3 is equipped with a flap valve 6, which controls the entry and exit of flue gas from a single water quenching tank, effectively preventing cross-contamination and leakage of smoke.

[0034] In summary, based on the current process conditions, the daily single-outlet flue gas emission volume is approximately 67,000 m³ / h, with a maximum flue gas velocity of 18 m / s. The most common daily emission is from two outlets. Calculations show that the diameter of flue gas branch 3 needs to be greater than 1147.4 mm, and the diameter of flue gas main 4 needs to be greater than 1622.7 mm. Therefore, a design with a diameter of 1200 mm for flue gas branch 3 and 1800 mm for flue gas main 4 is chosen. This design provides buffering capacity for high-temperature flue gas and also improves production stability.

[0035] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A flue gas treatment system for a flash smelting furnace, characterized in that: The system includes a smoke collection chamber (1), a steel platform (2), several branch flue gas pipelines (3), a main flue gas pipeline (4), a flap valve (6), and an ash discharge pipe (7). The main flue gas pipeline (4) is inclined from left to right on the side of the flash furnace. The top of the smoke collection chamber (1) of the flash furnace water quenching pool is fixedly welded to the steel platform (2), and the position of the steel platform (2) corresponds to that of the main flue gas pipeline (4). One end of the branch flue gas pipeline (3) is fixedly connected to the main flue gas pipeline (4), and the other end is connected to the flap valve (6). The flap valve (6) passes through the steel platform (2) and then connects to the smoke collection chamber (1). The top of the ash discharge pipe (7) is connected to the lowest point of the main flue gas pipeline (4), and the bottom is immersed in the water quenching pool.

2. A flue gas treatment system for a flash smelting furnace as claimed in claim 1, characterized in that The flap valve (6) includes a valve body (61), with through holes on both the upper and lower surfaces. A V-shaped rod (62) is rotatably installed on the left side of the upper part of the valve body (61), and a cylinder (63) is fixedly installed in the middle. The fixed end of the cylinder (63) extends outward through the valve body (61), and the telescopic end of the cylinder (63) is rotatably connected to one end of the V-shaped rod (62). The other end of the V-shaped rod (62) is fixedly connected to a flap (64) that blocks the top through hole.

3. A flue gas treatment system of a flash smelting furnace as claimed in claim 2, characterized in that: An openable manhole (65) is also fixed on the valve body (61) below the cylinder (63).

4. A flue gas treatment system for a flash furnace as described in any one of claims 1-3, characterized in that: The ash discharge pipe (7) is equipped with a slide valve.

5. A flue gas treatment system of a flash smelting furnace as claimed in claim 1, characterized in that: The main flue gas pipeline (4) is equipped with a flange in the middle of the first and second flue gas pipeline branches (3) on the left side, and a pipeline compensator (5) is connected through the flange.

6. The flue gas treatment system for a flash furnace as described in claim 1, characterized in that: The angle between the main flue gas pipeline (4) and the horizontal position is 5°–30°.

7. A flue gas treatment system for a flash smelting furnace as claimed in claim 1, characterized in that The flash furnace has several triangular supports (8) evenly distributed on its side, and each triangular support (8) has a support block on its top that matches the main flue gas pipeline (4).

8. The flue gas treatment system for a flash furnace as described in claim 1, characterized in that: The gas pipeline branch (3), flue gas pipeline main (4), flap valve (6) and ash discharge pipe (7) are all made of 304 stainless steel, and all connection positions are fully welded to avoid corrosion and leakage.

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