A method and device for capturing complex smoke from smelting pot surface

Abstract

The present invention relates to a method and device for capturing complex flue gas on the surface of a smelting pot, and the steps are as follows: a cover is arranged at the edge of the smelting pot to cover the edge, and an opening for the stirring shaft to enter and exit is arranged in the center of the cover top; a plurality of flaps and a flue gas duct connected to the dust collection system are arranged on the cover top, and the movable cover can be opened and closed to meet the needs of feeding, slag removal and observation of the smelting pot, while ensuring that the flue gas does not leak out; an automatic reset feeding flap is arranged at the connection between the rear end of the cover and the feeding device, and the flap is pushed open during feeding, and automatically reset and closed after feeding to ensure that the flue gas does not leak out. The cover top of the device is divided into a feeding and melting area, a stirring operation area, a flue gas capture area and a feeding and slag removal operation area, and feeding flaps, sealing flaps, a flue connected to the dust collection system and slag removal flaps are arranged respectively. The method and device of the present invention are easy to manufacture and install, simple and convenient to operate, and can fully capture flue gas to ensure the normal operation of the dust collection system without affecting the normal implementation of various operations on the pot surface platform.

Description

Technical Field

[0001] The invention relates to the field of environmental protection auxiliary equipment for metal smelting, and in particular to a method and device for capturing complex smoke from a smelting pot surface. Background Art

[0002] In the process of metal smelting fire refining and impurity removal, in order to obtain loose slag with less metal or to remove certain impurity metals in a targeted manner, it is often necessary to add rice husks, rosin, sulfur, caustic soda and other materials in the refining and impurity removal process to reduce the specific gravity of the slag and promote the separation and sedimentation of the molten liquid metal. At the same time, the acid electrolyte carried by the electrolytic cathode precipitate or the residual electrode when returning to the smelting will form a large amount of low-temperature complex flue gas containing acid, alkali, dust and moisture during the high-temperature melting process, which will deteriorate the operating environment of the pot surface platform. The low-temperature acidic and alkaline smoke is easy to condense and form dust collection bags, corrode equipment, and cause the dust collection system to fail to operate normally. The leakage of flue gas in the production site is extremely detrimental to the environment and the health of operators.

[0003] Take the refining of lead as an example. Since the operation of the pot surface involves complex operations such as feeding, chemical processing, feeding, stirring, slag and lead hooks, adding auxiliary materials and reagents, measuring temperature, and pumping lead liquid, it is difficult to find a method that does not affect the operation of the pot surface and can effectively capture the smoke and dust on the pot surface. In response to this common problem, some factories use a semi-enclosed fume capture hood with a large air leakage coefficient and poor capture effect; some factories add a hair dryer in front of the semi-enclosed fume hood as an air seal to block the smoke. The blowing intensity is difficult to adjust and change randomly with the fluctuation of the smoke volume on the pot surface. The smoke is blown away or cannot be blocked, which increases power consumption and does not improve the smoke capture effect much; some factories even take the approach of enclosing the entire pot surface production operation area and exhausting ventilation from the top of the building. Due to the large area, large air leakage coefficient, large exhaust power consumption and poor effect, the health of workers is sacrificed to maintain production. Therefore, how to find a fume capture method that has good exhaust and dust collection effect and does not affect the production operation of the pot surface is a production environmental protection technical problem that technicians in this field urgently need to solve. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems and to propose a method and device for capturing complex flue gases on the smelting pot surface. The method and device are easy to manufacture and install, and are simple and convenient to operate. They can fully capture the flue gas to ensure the normal operation of the dust collection system without affecting the normal implementation of various operations on the pot surface platform, thereby overcoming the shortcomings of the prior art.

[0005] The complex fume capture method on the smelting pot surface proposed by the present invention is aimed at an open smelting pot and is characterized by the following steps:

[0006] (1) A cover is set at the edge of the smelting pot to cover the edge, and an opening is set in the center of the cover top for the stirring shaft or alloy pump pipe to enter and exit;

[0007] (2) Multiple flaps and flue gas ducts connected to the dust collection system are installed on the top of the hood. The movable cover can be opened and closed to meet the needs of feeding, slag removal and observation of the smelting pot, while ensuring that the flue gas does not leak out;

[0008] (3) An automatically reset feeding flap is provided at the connection between the rear end of the cover and the feeding device. During feeding, the material slides down by its own weight and pushes open the flap. After feeding, it automatically resets and closes to ensure that smoke does not leak out.

[0009] The automatic resetting feeding flap is connected with the feeding device to form a feeding line.

[0010] The complex flue gas capture device on the smelting pot surface proposed in the present invention is composed of a cover placed on the edge of the smelting pot and a flue gas duct connected to the dust collection system, and is characterized in that the cover is divided into a feeding and melting zone, a stirring operation zone, a flue gas capture zone and a feeding and slag removal operation zone, the feeding and melting zone is arranged at the cover wall connected to the feeding device; the stirring operation zone is arranged at the central position of the cover top, where a stirring shaft sealing flap is provided for the stirring shaft or alloy pump to enter and exit; the flue gas capture zone is above the feeding and melting zone, and is a cover top plate with a flue gas duct fixed thereon, adjacent to the stirring operation zone; the feeding and slag removal zone is the area on the cover top excluding the stirring operation zone and the flue gas capture zone, and a plurality of movable flaps are provided in the feeding and slag removal operation zone.

[0011] The feed melting zone is provided with one or more movable leaf plates hung on the cover top, and a return spring is arranged between each movable leaf plate and the cover top.

[0012] The fume collecting area protrudes from the stirring operation area to meet the height requirements of the material to be melted and the movable blade in the feeding melting area.

[0013] There are multiple flaps in the feeding and slag removal operation area, and each flap has a handle for easy opening and closing.

[0014] There are six flaps in the feeding (referring to the feeding of slag-making auxiliary materials) and slag-removing operation area. From the back to the front, there are two flaps at the rear end on both sides of the smoke capture area, two flaps in the middle on both sides of the stirring operation area, and two flaps at the front end in front of the stirring operation area. They are symmetrically arranged to meet the needs of feeding auxiliary materials, slag removal and observation. Due to the stirring effect of the mixer, the scum on the melt surface in the pot always rotates and floats on the surface of the alloy liquid. Most of the scum can be opened and removed by opening the two flaps at the front end, or even by opening only one flap at the front end. The other flaps are only used to observe the scum removal in the pot and the feeding and auxiliary material feeding. In this way, it can be ensured that the smoke does not escape during the entire production process, and the production workshop is clean, hygienic, and environmentally friendly.

[0015] The mixing operation area is about 100mm away from the edge of the smelting pot to avoid the mixer shaft being too long and the shaft power being too large, which will cause an increase in equipment failure rate. At the same time, the fume hood space is compressed to ensure that the smoke inside the fume hood is well captured.

[0016] The stirring shaft sealing flap in the stirring operation area is centered on the mixer shaft hole and has an opening on the top of the cover. The size of the opening ensures that it does not affect the entry and exit of the mixer blades and the lead pump. At the same time, hinge connections are installed at reserved flap support points on both sides of the opening to ensure that the flap is closed and remains horizontal and airtight after the mixer or alloy pump is in place.

[0017] To avoid confusion, the present invention regards the cover and the smoke hood as synonyms, and the lead pump and the alloy pump as synonyms. The flap plate is referred to as the flap.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. A mixer shaft sealing flap is provided at the center of the mixer shaft hole at the top of the hood to facilitate the entry and exit of the mixer or lead pump equipment. After the equipment enters the position, the flap is closed to ensure the sealing of the equipment shaft pore.

[0020] 2. The flexible application of movable leaves and the round hood shape ensure the overall sealing effect of the hood and solve the problem of smoke leakage during pot surface production operations. In addition, the distance between the hoods in the mixing operation area and the feeding and slag removal operation area is less than 100mm from the top of the pot edge, and the internal volume of the hood is greatly reduced, which reduces the air leakage rate and helps to reduce the smoke exhaust volume and improve the exhaust effect. Thirdly, the reduction in exhaust volume not only reduces power consumption, but also prevents the smoke temperature from dropping sharply due to a large amount of cold air leaking in, thus avoiding low-temperature condensation. At the same time, it also solves the problems of dust bag compaction and equipment corrosion caused by condensation, ensuring the normal operation of the dust collection system.

[0021] 3. Implement feeding at the rear end of the hood and slag removal at the front end without affecting each other, thus improving production efficiency.

[0022] 4. No crane is needed to feed the pot surface, which reduces the load of crane use on the production site.

[0023] 5. The mixer frame is outside the smoke hood and isolated from the complex smoke environment inside the smoke hood, which protects the service life of the motor.

[0024] 6. The feeding flap at the rear end of the hood ensures smooth feeding, and the flap automatically resets after feeding to ensure the sealing of the hood.

[0025] 7. There are 6 slag removal flaps on the top of the smoke hood. Most of the slag can be removed by opening the front 2 flaps, or even just opening the front 1 flap. The other flaps are only opened briefly to observe the slag removal in the pot, and the rear 2 flaps are only used to observe the feeding and melting conditions. The entire production environment is always kept smoke-free.

[0026] 8. It is simple to manufacture and install, flexible and convenient to operate, and has a good flue gas capture effect, ensuring the normal operation of the dust collection system equipment and the emission of flue gas meets environmental protection standards.

[0027] Therefore, the present invention achieves the purpose of the invention of being easy to manufacture and install, simple and convenient to operate, and being able to fully capture flue gas to ensure the normal operation of the dust collection system without affecting the normal implementation of various operations on the pot surface platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic front view of the connection of the device of the present invention.

[0029] Figure 2 It is a left side view showing the connection of the device of the present invention.

[0030] Figure 3 It is a schematic top view of the connection of the device of the present invention.

[0031] Figure 4 It is a top view of the sealing flap portion of the stirring shaft of the present invention.

[0032] Figure 1-4 The parts are numbered as follows:

[0033] 1-chain conveyor; 2-mixer (or lead pump); 3-sealing flap of mixing shaft; 4-feeding flap at the rear end of smoke hood; 5-smoke hood; 6-smelting pot; 7-residual anode or precipitated lead; 8-feeding roller frame; 9-roller; 10-smoke outlet pipe; 11-operating flap on the top of smoke hood; 12-flap handle. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the specific embodiments of the present invention are only for the purpose of more clearly describing the technical solution and cannot be used as a limitation on the protection scope of the present invention.

[0035] See also Figure 1-4 A method and device for capturing complex flue gas on the surface of a smelting pot. The device is made of materials such as steel plates and is arranged to cover the edge of the smelting pot. It mainly includes two parts: a feeding device and a smoke hood 5 body.

[0036] The feeding device includes a chain conveyor 1, a feeding roller frame 8 and a roller 9, etc. This device is an existing equipment and is not described in detail here.

[0037] The working process of the present invention is:

[0038] First, the chain conveyor 1 is used to convey the anode residue or precipitated lead 7 to the opening position of the feed flap 4 at the rear end of the hood 5, and the anode residue or precipitated lead 7 is taken away from the chain conveyor 1 and enters the feed roller frame 8 through the hydraulic lifting and driving mechanism on the chain conveyor 1. The anode residue or precipitated lead 7 slides into the smelting pot 6 by its own weight through the roller 9 for melting. When there is enough lead liquid in the smelting pot, the stirring shaft sealing flap 3 is opened to install the fixed stirrer 2, and the stirring shaft sealing flap 3 is closed to maintain the sealing of the hood. The stirrer 2 is started to stir the lead liquid to accelerate the heat transfer and melting; the melting of the material is observed through the two top flaps at the rear end of the hood, and at the same time, the top flaps 11 of each hood are operated to add agents (auxiliary materials) according to the production process to remove impurities and form scum. The complex flue gas generated in the process is introduced into the dust bag box through the flue gas outlet pipe 10 to filter out the heavy metal dust and return it for use. Due to the high temperature of flue gas, acidic moisture passes through the filter cloth in gaseous state and is then captured by the water film dust collector before the clean flue gas meets the emission standards.

[0039] Secondly, when the slag is formed, continue to run the mixer 2, open the front end of the hood 1 or 2 pieces through the flap handle 12, operate the flap 11 on the top of the hood to stir and remove the slag manually, until the slag is removed.

[0040] Finally, the mixer 2 is removed and replaced with a lead pump. After being installed and fixed according to the above installation steps, the clean lead liquid is pumped out of the smelting pot 6 to perform ingot casting and other operations.

[0041] The examples have proved once again that the invention is simple to manufacture and install, and is flexible and convenient to operate. Compared with the prior art, it realizes that feeding, adding medicine, stirring, slag removal and lead removal operations do not affect each other, thus improving work efficiency; improving the operating environment, which is beneficial to the occupational health of workers; and solving the key common problem of low-temperature corrosive flue gas affecting the service life of dust collection equipment.

[0042] The above description is a detailed description of the preferred feasible implementation examples of the present invention, but the implementation examples are not used to limit the scope of the patent application of the present invention. All equivalent transformations or modified changes completed under the technical spirit suggested by the present invention belong to the patent scope covered by the present invention.

Claims

1. A complex fume capture device on the surface of a smelting pot, which consists of a cover placed on the edge of the smelting pot and a fume duct connected to a dust collection system, characterized in that The cover is divided into a feeding and melting zone, a stirring operation zone, a smoke collecting zone and a feeding and slag removing operation zone. The feeding and melting zone is arranged at the cover wall connected to the feeding device; the stirring operation zone is arranged at the central position of the cover top, where a stirring shaft sealing flap is provided for the stirring shaft or the alloy pump to enter and exit; the smoke collecting zone is above the feeding and melting zone, which is a cover top plate with a smoke pipe fixed thereon, and is adjacent to the stirring operation zone; the feeding and slag removing operation zone is the area on the cover top excluding the stirring operation zone and the smoke collecting zone, and a plurality of movable flaps are provided in the feeding and slag removing operation zone, and the feeding and melting zone has one or more movable flaps hung on the cover top, each movable flap is provided with a reset spring between the cover top and the cover top, and each movable flap is provided with a gripper.

2. According to the complex fume capture device on the smelting pot surface as described in claim 1, its characteristic is that the fume capture area protrudes from the stirring operation area to meet the height requirements of the material to be melted in the feed melting area and the movable blade.

3. According to claim 1, the complex smoke capture device on the smelting pot surface is characterized in that there are six movable blades in the feeding and slag removal operation area, from back to front, the rear two are on both sides of the smoke capture area, the middle two are on both sides of the stirring operation area, and the front two are in front of the stirring operation area.

4. According to the complex smoke capture device on the smelting pot surface as described in claim 1, its characteristic lies in that the distance between the stirring operation area and the edge of the smelting pot is determined in principle to avoid the increase of equipment failure rate due to excessive length of the stirrer shaft and excessive shaft power, and at the same time, the smoke hood space is compressed to ensure that the smoke inside the smoke hood is well captured.

5. According to claim 1, the complex smoke capture device on the smelting pot surface has the characteristic that the movable leaf plate in the stirring operation area is centered on the shaft hole of the mixer, and an opening is opened on the top of the cover. The size of the opening ensures that it does not affect the entry and exit of the mixer blades and the alloy pump. At the same time, hinge connections are installed on both sides of the opening to reserve movable leaf plate support points.

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