CN216919432U

CN216919432U - Aluminum-out ladle flue gas and anode scrap waste heat recovery and purification device

Info

Publication number: CN216919432U
Application number: CN202220140757.0U
Authority: CN
Inventors: 张文章; 高文义; 张坤; 陈长凯; 夏浩; 王攀; 唐凤凯; 朱海献; 练新强; 黄峰; 刘昆鹏
Original assignee: Yunnan Shenhuo Aluminum Co ltd
Current assignee: Yunnan Shenhuo Aluminum Co ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2022-07-08
Anticipated expiration: 2032-01-19

Abstract

The utility model belongs to the technical field of clean production, in particular to a device for recovering and purifying aluminum ladle smoke and anode scrap waste heat; the vacuum ladle comprises an aluminum electrolytic cell, a vacuum ladle and an ejector, wherein an aluminum absorption pipe is arranged between the aluminum electrolytic cell and the vacuum ladle, the vacuum ladle is provided with the ejector, an ejector tail gas outlet of the ejector is connected with an ejector tail gas connecting pipe, the ejector is connected with an ejector gas inlet pipe, a vacuum gas inlet pipe is arranged on the ejector gas inlet pipe, a conical connector is arranged on the vacuum gas inlet pipe, a compressed air rubber pipe connector is connected and arranged on the conical connector, and the ejector tail gas connecting pipe is connected with one end of a first steel pipe arranged on the aluminum electrolytic cell; the aluminum production process is more economical, environment-friendly and efficient, the workshop environment can be effectively improved, and a good working environment is created for workers.

Description

Aluminum-out ladle flue gas and anode scrap waste heat recovery and purification device

Technical Field

The utility model belongs to the technical field of clean production, and particularly relates to a device for recovering and purifying aluminum ladle smoke and anode scrap waste heat.

Background

The aluminum discharging ladle is an important device in the electrolytic aluminum smelting process, and is a device for sucking and collecting liquid aluminum in an electrolytic cell in an aluminum electrolysis workshop. The electrolyte entering the aluminum ladle is accelerated to be gasified and discharged out of the aluminum ladle along with the jet tail gas under the action of vacuum. If this fraction of fluoride is discharged directly into the plant, the amount of unstructured fluoride discharge will increase. Or the jet flow tail gas is introduced into the electrolytic cell, and the tail gas flow velocity is large, so that the smoke balance of the electrolytic cell is damaged, the normal smoke exhaust system of the electrolytic cell is influenced, and the environment of an electrolytic plant is greatly polluted.

In the aluminum discharging operation process, a large amount of smoke is generated from the negative pressure generator, waste heat is taken away from the discharged smoke, the waste heat is dissipated to the production environment, and part of electric energy cannot be used for production and is converted into heat to be consumed due to the fact that the waste heat is taken away from the discharged smoke, so that electric quantity consumption is further increased. In addition, in the electrode changing operation of the electrolytic plant, residual electrode carbon blocks with high temperature of 940-960 ℃ and changed from the electrolytic bath are placed on an operation platform of the electrolytic plant for natural cooling, and a large amount of HF and SO are continuously emitted in the cooling process₂And pollutants such as CO, dust and the like cause serious pollution in an electrolysis workshop and influence the personal safety of workers.

In the prior art, the smoke generated by the aluminum outlet ladle is mostly extracted by the ejector extraction fan so as to maintain the negative pressure state in the aluminum outlet ladle, and a large amount of smoke is directly discharged into the atmosphere to cause energy waste and thermal pollution. In addition, the temperature of the anode scrap carbon block taken out from the electrolytic bath is 940-960 ℃, the cover body is adopted for natural cooling, the cooling speed is low, heat is completely wasted, and resource waste is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a device for recovering and purifying aluminum ladle smoke and residual anode waste heat, wherein the discharged air contains aluminum powder and other smoke, the aluminum powder and other smoke are subjected to waste heat utilization by a new anode preheating box, enter an electrolysis bath smoke exhaust main pipe through a pipeline, enter a purification system together with electrolysis smoke for recovery and then are discharged into the atmosphere, and the new anode preheating box also achieves the effect of recovering waste heat, so that the problem of smoke unorganized emission pollution is solved, the obtained aluminum operation is more economic, environment-friendly and efficient, the workshop environment can be effectively improved, and a good working environment is created for staff.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a device for recovering and purifying aluminum outlet ladle smoke and anode scrap waste heat comprises an aluminum electrolytic cell, a vacuum ladle and an ejector, wherein an aluminum absorption pipe is arranged between the aluminum electrolytic cell and the vacuum ladle, the vacuum ladle is provided with the ejector, an ejector tail gas outlet of the ejector is connected with an ejector tail gas connecting pipe, the ejector is connected with an ejector air inlet pipe, the ejector air inlet pipe is provided with a vacuum gas inlet pipe, the vacuum gas inlet pipe is provided with a conical connector, the conical connector is connected with a compressed air rubber pipe connector, the ejector tail gas connecting pipe is connected with one end of a steel pipe I arranged on the aluminum electrolytic cell, the other end of the steel pipe I is connected with a smoke exhaust main pipe, a hose is arranged between the steel pipe I and the ejector tail gas, a new anode preheating box is arranged in front of the ejector tail gas connecting pipe and the hose, the end parts of the hose and the steel pipe I are respectively provided with a first connector and a second connector, and the first connector are fixedly connected with the second connector, the hose and the first steel pipe are respectively provided with a first valve and a second valve, the first valve and the second valve are arranged on the inner sides of a first connector and a second connector at the end parts of the hose and the first steel pipe, the first valve and the second valve are in a normally closed state, a third steel pipe is arranged between the first steel pipe and the smoke exhaust main pipe, a second steel pipe is arranged between the first steel pipe and the third steel pipe, and a first insulating pipe and a second insulating pipe are arranged between the second steel pipe and the joints of the first steel pipe and the third steel pipe; the main smoke exhaust pipe is connected to the end part of the aluminum electrolysis cell through a smoke exhaust branch pipe, and a smoke exhaust valve is arranged on the main smoke exhaust pipe.

Furthermore, the first connector and the second connector form a pair of two parts which can realize quick connection and disconnection of the quick connector.

Further, the middle part of one side of the new anode preheating box is provided with an air inlet pipe, the top of the opposite side of the new anode preheating box is provided with a flue gas outlet pipe, the flue gas outlet pipe of the new anode preheating box is connected with the first valve through a quick connector, the tail end of the air inlet pipe is provided with the new anode preheating box, a partition plate is arranged in the new anode preheating box to separate the new anode preheating box into a placing cavity and a hot gas cavity, a sealing cover covers the placing cavity and is provided with an anode guide rod hole, an air hole is formed in the partition plate, an axial flow fan is arranged between an anode scrap block and a new anode block on the inner side of the placing cavity, and the anode scrap block and the new anode block are placed on the bottom plate and cover the cover body.

Further, the inner surface and the outer surface of the new anode preheating box are provided with heat preservation layers.

Furthermore, the first steel pipe is arranged at the upper part of the electrolytic cell, the edge part of the electrolytic cell shell or the lower part of the electrolytic cell.

Further, the method comprises the following steps: when aluminum discharging operation is carried out, a compressed air pipe is connected with an air inlet pipe of the ejector, a first connector is connected with a second connector, a first valve and a second valve are opened, tail gas of the ejector enters a smoke discharging main pipe along an ejector tail gas connecting pipe, a new anode preheating box, a hose, a first valve, a first connector, a second valve, a first steel pipe, a first insulating pipe, a second steel pipe, a second insulating pipe and a third steel pipe, and the tail gas of the aluminum discharging ladle ejector entering the smoke discharging main pipe and electrolytic smoke are purified and treated by a purification system.

Compared with the prior art, the utility model has at least one of the following beneficial effects:

1. the tail gas of the aluminum-discharging ladle ejector contains aluminum powder and other flue gas, and is directly sent to the electrolysis flue gas exhaust main pipe through the flue gas exhaust pipeline after the waste heat of the new anode preheating box is recycled, and is purified together with the electrolysis flue gas.

2. The utility model is provided with the new anode preheating box, the anode scrap carbon block and the new anode carbon block are placed on the bottom plate, the cover body is covered, the baffle is removed, the bottom of the anode scrap carbon block directly leaks into the heat exchange chamber, the heat reflection and the heat convection at the bottom of the anode scrap carbon block are transferred to the bottom of the new anode through the heat exchange chamber, and the heat exchange smoke exhaust axial flow fan can utilize the high-temperature heat of the anode scrap carbon block to heat the new anode carbon block in an all-around manner, fully utilizes the waste heat of the anode scrap carbon block, avoids energy waste, saves energy and can increase the utilization rate of the heat.

3. After the residual anode heat is recycled by the waste heat of the new anode preheating box, the residual anode flue gas can be directly sent to the electrolysis flue gas exhaust main pipe and purified together with the electrolysis flue gas, the risk of unorganized emission of the flue gas is reduced, the field environment in an aluminum electrolysis workshop is greatly improved, and a good working environment is created for staff.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

FIG. 3 is a top view of the aluminum tapping ladle of the present invention.

In the figure, 1-an aluminum electrolytic cell, 2-an aluminum ladle, 3-an ejector, 4-an aluminum absorption pipe, 5-an ejector tail gas connecting pipe, 6-a hose, 7-a valve I, 8-a connector I, 9-a connector II, 10-a valve II, 11-a steel pipe I, 12-an insulating pipe I, 13-a steel pipe II and 14-an insulating pipe II, 15-three steel pipes, 16-smoke exhaust branch pipes, 17-smoke exhaust main pipe, 18-smoke exhaust valve, 19-ejector tail gas outlet quick joint, 20-ejector air inlet pipe, 21-axial flow fan, 22-air inlet pipe, 23-smoke exhaust outlet pipe, 24-new anode preheating box, 25-partition plate, 26-placing cavity, 27-hot air cavity, 28-anode scrap carbon block and 29-new anode carbon block.

Detailed Description

As shown in fig. 1 to 3, in order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Example 1

The device for recovering and purifying the aluminum-discharging ladle smoke and the residual anode waste heat comprises an aluminum electrolytic cell 1, an aluminum-discharging ladle 2 and an ejector 3, wherein an aluminum absorption pipe 4 is arranged between the aluminum electrolytic cell 1 and the aluminum-discharging ladle 2, the ejector 3 is arranged on the aluminum-discharging ladle 2, an ejector tail gas outlet quick connector 19 of the ejector 3 is connected with an ejector tail gas connecting pipe 5, the ejector 3 is connected with an ejector air inlet pipe 20, the ejector tail gas connecting pipe 5 is connected with one end of a steel pipe I11 arranged on the aluminum electrolytic cell 1, the other end of the steel pipe I11 is connected with a smoke exhaust main pipe 17, the steel pipe I11 is laid on the upper part of the electrolytic cell, the edge part of an electrolytic cell shell or the lower part of the electrolytic cell, a hose 6 is arranged between the steel pipe I11 and the ejector tail gas connecting pipe 5, a new anode preheating box 24 is arranged in front of the hose 6 and the ejector tail gas connecting pipe 5, the end part of the steel pipe I11 is respectively provided with a joint I8 and a joint II 9, and the joint 8 are fixedly connected with the II joint 9, the first connector 8 and the second connector 9 are two parts of a pair of quick connectors and can realize quick connection and disconnection, the first steel pipe 11 is respectively provided with a first valve 7 and a second valve 10, the first valve 7 and the second valve 10 are arranged on the inner sides of the first connector 8 and the second connector 9 at the end parts of the hose 6 and the first steel pipe 11, the first valve 7 and the second valve 10 are in a normally closed state, and compressed air can be introduced when the first valve 7 and the second valve 10 are opened; a third steel pipe 15 is arranged between the first steel pipe 11 and the smoke exhaust main pipe 17, a second steel pipe 13 is arranged between the first steel pipe 11 and the third steel pipe 15, and a first insulating pipe 12 and a second insulating pipe 14 are arranged between the second steel pipe 13 and the joint of the first steel pipe 11 and the third steel pipe 15; the main exhaust pipe 17 is connected with the end part of the aluminum electrolysis cell 1 through the exhaust branch pipe 16, and the main exhaust pipe 17 is provided with an exhaust valve 18.

The pipeline from the ejector 3 to the smoke exhaust main pipe 17 can be shared by N aluminum electrolysis cells, N is more than or equal to 1 and less than or equal to 55, and the pipelines among the aluminum electrolysis cells are separated by insulating joints.

And an air pipe is arranged between the new anode preheating box 24 and the flue gas outlet pipe 23 and the first valve 7, and an induced draft fan is arranged in the air pipe to enhance the flue gas emission.

When aluminum discharging operation is carried out, the compressed air pipe is connected with the air inlet pipe 20 of the ejector, the first connector 8 is connected with the second connector 9, the first valve 7 and the second valve 10 are opened, and tail gas of the ejector 3 enters the smoke exhaust main pipe 17 along the tail gas connecting pipe 5 of the ejector, the hose 6, the new anode preheating box 24, the first valve 7, the first connector 8, the second connector 9, the second valve 10, the first steel pipe 11, the first insulating pipe 12, the second steel pipe 13, the second insulating pipe 14 and the third steel pipe 15. The tail gas of the aluminum outlet ladle ejector entering the smoke exhaust main pipe and the electrolytic flue gas are purified and treated by a purification system.

Example 2

On the basis of the embodiment 1, the residual anode carbon block waste heat is used for preheating the new anode carbon block before the anode carbon block is replaced, the new anode preheating box can be independently used, and the residual anode flue gas and the electrolysis bath flue gas are discharged into a flue gas purification system together.

An air inlet pipe 22 is arranged in the middle of one side of a new anode preheating box 24, a flue gas outlet pipe 23 is arranged at the top of the opposite side, the flue gas outlet pipe 23 of the new anode preheating box 24 is connected with a first valve 7 through a quick joint of an air pipe, an induced draft fan is arranged in the air pipe between the flue gas outlet pipe 23 and the first valve 7, a new anode preheating box 24 is arranged at the tail end of the air inlet pipe 22, a partition plate 25 is arranged in the new anode preheating box 24 to divide the new anode preheating box 24 into a placing cavity 26 and a hot air cavity 27, a sealing cover is arranged on the placing cavity 26 in a covering manner, an anode guide rod hole is arranged on the sealing cover, an air hole is formed in the partition plate 25, an axial flow fan 21 is arranged between a residual anode carbon block 28 and a new anode carbon block 29 inside the placing cavity 26, the residual anode carbon block 28 and the new anode carbon block 29 are placed on a bottom plate and covered by a cover body, the partition plate is removed, and the bottom of the residual anode carbon block 28 is directly exposed in the hot air cavity 27, the heat reflection and the heat convection at the bottom of the anode scrap carbon block 28 are transferred to the bottom of the new anode carbon block 29 through the hot air cavity 27, and the heat exchange and smoke exhaust axial flow fan 21 can heat the new anode carbon block 29 in an all-around manner by utilizing the high-temperature heat of the anode scrap carbon block 28, so that the waste heat of the anode scrap carbon block is fully utilized, the energy waste is avoided, the energy is saved, and the utilization rate of the heat can be increased.

Although the utility model has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. Go out device that aluminium two-man ladle flue gas and anode scrap waste heat recovery and purification, including aluminium cell (1), vacuum two-man ladle (2), ejector (3), be equipped with aluminium absorption pipe (4) between aluminium cell (1) and vacuum two-man ladle (2), be equipped with ejector (3) on vacuum two-man ladle (2), ejector tail gas outlet (19) and ejector tail gas takeover (5) of ejector (3) are connected, ejector (3) are connected with ejector intake pipe (20), be provided with the vacuum gas intake pipe on ejector intake pipe (20), be provided with the taper joint in the vacuum gas intake pipe, connect on the taper joint and set up and connect compressed air rubber tube joint, its characterized in that: the ejector tail gas connecting pipe (5) is connected with one end of a first steel pipe (11) arranged on the aluminum electrolytic cell (1), the other end of the first steel pipe (11) is connected with a smoke exhaust main pipe (17), a hose (6) is arranged between the first steel pipe (11) and the ejector tail gas connecting pipe (5), a new anode preheating box (24) is arranged in front of the ejector tail gas connecting pipe (5) and the hose (6), a first connector (8) and a second connector (9) are respectively arranged at the end parts of the hose (6) and the first steel pipe (11), the first connector (8) is fixedly connected with the second connector (9), a first valve (7) and a second valve (10) are respectively arranged on the hose (6) and the first steel pipe (11), the first valve (7) and the second valve (10) are arranged at the inner sides of the first connector (8) and the second connector (9) at the end parts of the hose (6) and the first steel pipe (11), and the first valve (7) and the second valve (10) are in a normally closed state, a third steel pipe (15) is arranged between the first steel pipe (11) and the smoke exhaust main pipe (17), a second steel pipe (13) is arranged between the first steel pipe (11) and the third steel pipe (15), and a first insulating pipe (12) and a second insulating pipe (14) are arranged between the second steel pipe (13) and the joint of the first steel pipe (11) and the third steel pipe (15); the main smoke exhaust pipe (17) is connected to the end part of the aluminum electrolysis cell (1) through a branch smoke exhaust pipe (16), and the main smoke exhaust pipe (17) is provided with a smoke exhaust valve (18).

2. The aluminum tapping ladle flue gas and anode scrap waste heat recovery and purification device according to claim 1, wherein the device comprises: the first joint (8) and the second joint (9) form a pair of two parts which can realize quick connection and disconnection of the quick joint.

3. The aluminum tapping ladle flue gas and anode scrap waste heat recovery and purification device according to claim 1, wherein the device comprises: the middle part of one side of the new anode preheating box (24) is provided with an air inlet pipe (22), the top of the opposite side is provided with a flue gas outlet pipe (23), the flue gas outlet pipe (23) of the new anode preheating box (24) is connected with the first valve (7) through a quick connector, the tail end of the air inlet pipe (22) is provided with the new anode preheating box (24), a partition plate (25) is arranged in the new anode preheating box (24) to divide the new anode preheating box (24) into a placing cavity (26) and a hot gas cavity (27), a sealing cover is covered on the placing cavity (26), an anode guide rod hole is formed in the sealing cover, an air hole is formed in the partition plate (25), an axial flow fan (21) is arranged between a residual anode carbon block (28) and a new anode carbon block (29) on the inner side of the placing cavity (26), and the residual anode carbon block (28) and the new anode carbon block (29) are placed on the bottom plate and are covered by a cover body.

4. The aluminum tapping ladle flue gas and anode scrap waste heat recovery and purification device according to claim 3, wherein the device comprises: the inner surface and the outer surface of the new anode preheating box (24) are provided with heat preservation layers.

5. The aluminum tapping ladle flue gas and anode scrap waste heat recovery and purification device according to claim 1, wherein the device comprises: the first steel pipe (11) is arranged at the upper part of the electrolytic tank (1), the edge part of the electrolytic tank shell or the lower part of the electrolytic tank.