Water-cooling flue device for sedimentation electric furnace

Abstract

The water-cooling flue device comprises a main flue gas pipe and a dust falling 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 falling flue, the main flue gas pipe is obliquely arranged, and a plurality of water-cooling jackets are installed on the outer wall face of the main flue gas pipe in the overall length direction. 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 hopper, and the ash hopper is cleaned regularly.

Description

Technical Field

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

[0002] In modern copper pyrometallurgy, the sedimentation furnace is mainly used to achieve the sedimentation separation of matte and slag, and reduce the copper content in the slag. Compared with other blast furnaces, the flue gas of the sedimentation furnace that only uses electric heating is characterized by low flue gas volume and high temperature.

[0003] The water-cooled flue of a smelter's settling electric furnace is composed of a DN800 carbon steel pipe, with a multi-section split semi-cylindrical water jacket on the outside. The water-cooled flue is mainly divided into a slope section and a horizontal section. The slope section is mainly used to send the flue gas to a relatively open high-rise platform, and the horizontal section of the high-rise platform is mainly used to cool the flue gas and settle the particles in the flue gas. The horizontal section of the flue is arranged according to the rule of water jacket-working door-water jacket-ash hopper-water jacket-working door, and there is no cooling water jacket at the working door section and ash hopper section. During use, the following problems exist: First, the carbon steel flue has poor corrosion resistance and is prone to leakage, which leads to an increase in the system leakage rate; second, half of the length of the horizontal section flue has no water jacket for heat exchange, and the heat exchange efficiency is poor, resulting in a high flue gas temperature, and the rear-end fan is more prone to failure; third, there are too many working doors, the air leakage rate is high, and the working door needs to be opened frequently to push the flue ash into the ash hopper, which is labor-intensive and has the risk of scalding from high-temperature flue gas. Summary of the invention

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

[0005] The specific scheme of the present invention 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 entrance of the dust reduction flue. The main flue gas pipe is arranged obliquely, and the outer wall surface of the main flue gas pipe is equipped with several water-cooling jackets along the entire length. The dust reduction flue is arranged in a horizontal direction. The dust reduction flue is formed by connecting several sections of boxes. The side walls and top walls of the boxes are composed of water-cooled walls. An ash hopper is provided at the bottom of each box, 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 smoke 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 smoke pipe and the auxiliary smoke pipe. The auxiliary smoke pipe is arranged parallel to the main smoke pipe.

[0008] Furthermore, the main smoke pipe and the auxiliary smoke 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 smoke pipe and the auxiliary smoke pipe are both equipped with expansion joints.

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

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. A dust reduction flue is provided, which is formed by connecting multiple sections of boxes. Each section of the box is composed of five water-cooled walls + an ash hopper. No working door is provided. All the smoke ash in the horizontal section naturally settles into the ash hopper. Only the ash hopper needs to be cleaned regularly, and the problems of dust accumulation and cleaning in the horizontal section of the flue are effectively solved; 2. The large-sectional square water-cooled flue with variable diameter in the horizontal section can slow down the flow rate of the flue gas and increase the area of ​​the water-cooled wall at the same time, 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 a front view of the present invention; Figure 2 is a top view of the present invention; Figure 3 It is a structural schematic diagram of a single-section box of the dust reduction flue of the present invention; In the figure: 1. Main flue gas duct; 2. Auxiliary flue gas duct; 3. Dust reduction flue; 31. Water-cooled wall; 32. Ash hopper; 4. Fan; 5. Expansion joint; 6. Furnace body. DETAILED DESCRIPTION

[0013] like Figure 1-3 As shown, this embodiment is a water-cooled flue device for a settling electric furnace, comprising a main flue gas pipe 1 and a dust-reducing flue 3. The bottom end of the main flue gas pipe 1 is connected to the tail gas outlet of the settling electric furnace, and the top end is connected to the inlet of the dust-reducing flue 3. The main flue gas pipe 1 is arranged obliquely, and the outer wall surface of the main flue gas pipe 1 is equipped with a plurality of water-cooling jackets along the entire length. The dust-reducing flue 3 is arranged in a horizontal direction, and the dust-reducing flue 3 is formed by connecting a plurality of box sections, and the side wall surface and the top wall surface of the box are both composed of water-cooled walls 31. The bottom end of each box is provided with an ash hopper 32, and a valve is installed at the bottom of the ash hopper 32. The end of the dust-reducing flue 3 is connected to a fan 4. Further, the channel area of ​​the dust-reducing flue 3 is larger than the channel area of ​​the main flue gas pipe 1.

[0014] Furthermore, it also includes an auxiliary smoke 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 smoke pipe 1 and the auxiliary smoke pipe 2. The auxiliary smoke pipe 2 is arranged parallel to the main smoke pipe 1.

[0015] 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 reduction flue 3 is made of 304 stainless steel.

[0016] Furthermore, the main smoke pipe 1 and the auxiliary smoke pipe 2 are both equipped with expansion joints 5 .

[0017] Furthermore, the connection points between the main smoke pipe 1 and the auxiliary smoke pipe 2 and the dust reduction flue 3 are higher than the lowest point of the dust reduction flue 3 .

[0018] When the present invention 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, and all the smoke ash naturally settles into the ash hopper 32, and the staff can lift up and clean the ash hopper 32.

[0019] The flue gas is directly in contact with the water-cooled wall 31 of the dust reduction flue 3 for cooling, thereby improving the cooling effect.

[0020] The biggest safety risk of the water-cooled flue of the copper smelting sedimentation furnace comes from the cooling water entering the furnace body 6, causing the high-temperature molten body to explode. The present invention sets the connection between the flue gas pipe and the dust reduction flue 3 to be higher than the low 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, and also will not enter the furnace body 6; the flue gas pipe adopts the form of a split water jacket wrapped in the outer wall. Even if a leak occurs in the split water jacket, 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 gas outlet of the settling electric furnace, and the top end is connected to the entrance 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 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 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. A fan is connected to the end of the dust reduction flue.

2. A 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 smoke 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 smoke pipe and the auxiliary smoke pipe. The auxiliary smoke pipe is arranged in parallel with the main smoke pipe.

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

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