Water-cooling flue device for sedimentation electric furnace

Abstract

The utility model provides a water cooling flue device for a sedimentation electric furnace, which comprises a main flue gas pipe and a dust fall flue, the bottom end of the main flue gas pipe is connected with a tail gas outlet of the sedimentation electric furnace, the top end of the main flue gas pipe is connected with an inlet of the dust fall flue, the main flue gas pipe is obliquely arranged, and a plurality of water cooling jackets are arranged on the outer wall surface of the main flue gas pipe along the full length. The dust falling flue is arranged in the horizontal direction and is formed by connecting a plurality of box bodies, the side wall surface and the top wall surface of each box body are composed of water cooling walls, the bottom end of each box body is provided with an ash bucket, the bottom of each ash bucket is provided with a valve, and the tail end of the dust falling flue is connected with a fan; the dust collection efficiency is improved, the heat exchange effect is improved, a working door is not arranged in the dust falling flue of the horizontal section, all soot naturally settles to the ash bucket, and the ash bucket can be cleaned regularly.

Description

Technical Field

[0001] The utility model relates to the technical field of copper smelting production, in particular to a water-cooling flue device for a sedimentation electric furnace. Background Art

[0002] In modern copper pyrometallurgy, electric drop furnaces are primarily used to separate matte from slag, reducing the copper content in the slag. Compared to other blast furnaces, electric drop furnaces, which utilize only electrical heating, produce flue gas with lower volume and higher temperature.

[0003] The water-cooled flue of a certain smelter's electric furnace consists of DN800 carbon steel pipes encased in a multi-section, split, semi-cylindrical water jacket. The water-cooled flue is primarily divided into a sloped section and a horizontal section. The sloped section primarily conveys flue gas to a relatively open, high-rise platform, while the horizontal section on the high-rise platform primarily cools the flue gas and settles particulate matter. The horizontal section follows a pattern of water jacket-operating door-water jacket-ash hopper-water jacket-operating door. The working door and ash hopper sections lack cooling water jackets. During operation, the following problems arose: First, the carbon steel flue had poor corrosion resistance, making it prone to leaks and increasing the system's air leakage rate. Second, half the length of the horizontal flue lacked a water jacket for heat exchange, resulting in poor heat transfer efficiency, high flue gas temperatures, and increased susceptibility to downstream fan failure. Third, the excessive number of operating doors resulted in high air leakage, and the doors needed to be frequently opened to push flue ash into the ash hopper, which was labor-intensive and posed a risk of burns from the high-temperature flue gas. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a water-cooled flue device for a sedimentation electric furnace.

[0005] The specific scheme of the present utility model is as follows: a water-cooled flue device for a sedimentation electric furnace, comprising a main flue gas pipe and a dust reduction flue. The bottom end of the main flue gas pipe is connected to the exhaust outlet of the sedimentation electric furnace, and the top end is connected to the inlet of the dust reduction flue. The main flue gas pipe is arranged obliquely, and the outer wall of the main flue gas pipe is equipped with several sections of water-cooled jackets along the entire length. The dust reduction flue is arranged in a horizontal direction, and the dust reduction flue is connected by several sections of box bodies. The side walls and top walls of the box bodies are composed of water-cooled walls. An ash hopper is provided at the bottom of each box body, and a valve is provided at the bottom of the ash hopper. A fan is connected to the end of the dust reduction flue.

[0006] Furthermore, the channel area of ​​the dust reduction flue is larger than the channel area of ​​the main flue gas pipe.

[0007] Furthermore, it also includes an auxiliary flue pipe. The dust reduction flue is T-shaped, with a smoke inlet at each end and a smoke outlet at the other end. The smoke outlet is connected to the fan, and the two smoke outlets are respectively connected to the main flue pipe and the auxiliary flue pipe. The auxiliary flue pipe is arranged parallel to the main flue pipe.

[0008] Furthermore, the main flue gas pipe and the auxiliary flue gas pipe are both made of 316L stainless steel, and the box body of the dust reduction flue is made of 304 stainless steel.

[0009] Furthermore, the main flue gas pipe and the auxiliary flue gas pipe are both equipped with expansion joints.

[0010] Furthermore, the connection points between the main flue gas pipe and the auxiliary flue gas pipe and the dust reduction flue are higher than the lowest point of the dust reduction flue.

[0011] Compared with the prior art, the utility model has the following beneficial effects: 1. A dust reduction flue is set up, which is connected by multiple box sections. Each box section is composed of five water-cooled walls + an ash hopper. No working door is set. All the smoke ash in the horizontal section naturally settles into the ash hopper. It only needs to clean the ash hopper regularly. The problem of dust accumulation and cleaning of the horizontal flue is effectively solved; 2. The large-cross-sectional square water-cooled flue with variable diameter in the horizontal section can slow down the flue gas flow rate and increase the area of ​​the water-cooled wall, thereby obtaining better dust collection efficiency and heat exchange effect; 3. The inlet smoke pipe uses 316L stainless steel, and the dust reduction flue uses 304 stainless steel, which can effectively extend the service life of the flue. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the main view of the utility model;

[0013] Figure 2 It is a top view of the utility model;

[0014] Figure 3 This is a structural diagram of a single-section box of a dust suppression flue of the utility model;

[0015] In the figure: 1. Main flue gas duct; 2. Auxiliary flue gas duct; 3. Dust suppression flue; 31. Water-cooled wall; 32. Ash hopper; 4. Fan; 5. Expansion joint; 6. Furnace body. DETAILED DESCRIPTION

[0016] like Figure 1-3 As shown, this embodiment is a water-cooled flue device for a sedimentation electric furnace, comprising a main flue pipe 1 and a dust reduction flue 3. The bottom end of the main flue pipe 1 is connected to the exhaust outlet of the sedimentation electric furnace, and the top end is connected to the inlet of the dust reduction flue 3. The main flue pipe 1 is arranged obliquely, and the outer wall of the main flue pipe 1 is provided with several sections of water-cooled jackets along the entire length. The dust reduction flue 3 is arranged in a horizontal direction. The dust reduction flue 3 is formed by connecting several sections of box bodies, and the side walls and top walls of the box bodies are both composed of water-cooled walls 31. An ash hopper 32 is provided at the bottom of each box body, and a valve is provided at the bottom of the ash hopper 32. The end of the dust reduction flue 3 is connected to a fan 4.

[0017] Furthermore, the channel area of ​​the dust reduction flue 3 is larger than the channel area of ​​the main flue gas pipe 1 .

[0018] Furthermore, it also includes an auxiliary flue pipe 2. The dust reduction flue 3 is T-shaped, with a smoke inlet at each end and a smoke outlet at the other end. The smoke outlet is connected to the fan 4. The two smoke outlets are respectively connected to the main flue pipe 1 and the auxiliary flue pipe 2. The auxiliary flue pipe 2 is arranged parallel to the main flue pipe 1.

[0019] Furthermore, the main flue gas pipe 1 and the auxiliary flue gas pipe 2 are both made of 316L stainless steel, and the box body of the dust suppression flue 3 is made of 304 stainless steel. Furthermore, the main flue gas pipe 1 and the auxiliary flue gas pipe 2 are both equipped with expansion joints 5.

[0020] Furthermore, the connection points between the main flue gas pipe 1 and the auxiliary flue gas pipe 2 and the dust reduction flue 3 are higher than the lowest point of the dust reduction flue 3 .

[0021] When the utility model is working, the flue gas generated by the furnace body 6 rises from the main flue pipe 1 and the auxiliary flue pipe 2 to the dust reduction flue 3, and is finally drawn to the next process through the fan 4. The main flue pipe 1 and the auxiliary flue pipe 2 are cooled by the water cooling jacket, and the flue gas is cooled and dusted by the water cooling wall 31. There is no need to set a working door in the entire dust reduction flue 3. All the smoke ash naturally settles into the ash hopper 32, and the staff can lift up and clean the ash hopper 32.

[0022] The flue gas is directly in contact with the water-cooled wall 31 of the dust reduction flue 3 to be cooled, thereby improving the cooling effect.

[0023] The biggest safety risk of the water-cooled flue of the copper smelting sedimentation electric furnace comes from cooling water entering the furnace body 6, causing the high-temperature molten body to explode. The utility model sets the connection between the flue gas pipe and the dust reduction flue 3 to be higher than the lowest point of the dust reduction flue 3, so that even if the water-cooled wall 31 of the horizontal dust reduction flue 3 leaks, it will not enter the flue gas pipe, nor will it enter the furnace body 6; the flue gas pipe adopts the form of a split water jacket wrapped in the outer wall. Even if the split water jacket has a leak, the leak will only occur on the outer wall of the flue and will not enter the furnace body 6, thus eliminating the risk of cooling water entering the furnace body 6.

Claims

1. A water-cooled flue device for a sedimentation electric furnace, characterized in that: It includes a main flue gas pipe and a dust reduction flue. The bottom end of the main flue gas pipe is connected to the exhaust outlet of the sedimentation electric furnace, and the top end is connected to the inlet of the dust reduction flue. The main flue gas pipe is arranged obliquely, and the outer wall of the main flue gas pipe is equipped with several sections of water cooling jackets along the entire length. The dust reduction flue is arranged in a horizontal direction. The dust reduction flue is connected by several sections of box bodies. The side walls and top walls of the box bodies are composed of water-cooled walls. An ash hopper is provided at the bottom of each box body, and a valve is installed at the bottom of the ash hopper. The end of the dust reduction flue is connected to a fan.

2. The water-cooled flue device for a sedimentation electric furnace according to claim 1, characterized in that: The channel area of ​​the dust reduction flue is larger than the channel area of ​​the main flue gas pipe.

3. The water-cooled flue device for a sedimentation electric furnace according to claim 1, characterized in that: It also includes an auxiliary flue pipe. The dust reduction flue is T-shaped, with a smoke inlet at each end and a smoke outlet at the other end. The smoke outlet is connected to the fan. The two smoke outlets are respectively connected to the main flue pipe and the auxiliary flue pipe. The auxiliary flue pipe is arranged parallel to the main flue pipe.

4. The water-cooled flue device for a sedimentation electric furnace according to claim 3, characterized in that: The main flue gas pipe and the auxiliary flue gas pipe are both made of 316L stainless steel, and the box body of the dust reduction flue is made of 304 stainless steel.

5. The water-cooled flue device for a sedimentation electric furnace according to claim 3, characterized in that: The main flue gas pipe and the auxiliary flue gas pipe are both equipped with expansion joints.

6. The water-cooled flue device for a sedimentation electric furnace according to claim 3, characterized in that: The connection points between the main smoke pipe, the auxiliary smoke pipe and the dust reduction flue are higher than the lowest point of the dust reduction flue.

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