CN220696160U

CN220696160U - Device for preventing slag crust generated by electrolysis flue gas pipeline and purification equipment

Info

Publication number: CN220696160U
Application number: CN202322396952.7U
Authority: CN
Inventors: 熊晓林
Original assignee: Guizhou Xinsenju Mining Co ltd
Current assignee: Guizhou Xinsenju Mining Co ltd
Priority date: 2023-09-05
Filing date: 2023-09-05
Publication date: 2024-04-02
Anticipated expiration: 2033-09-05

Abstract

The utility model discloses a device for preventing slag shells from being generated in an electrolytic flue gas pipeline and purifying equipment, which comprises a shell, a filter screen, a connecting pipe, an air storage tank, a compressed air pipe, a pulse valve, a spray pipe, a dust-free chamber, a branch pipe and a pulse valve pressure switch. The utility model prevents slag crust from blocking equipment in the pipeline and the purifying system, and automatically cleans the filter screen.

Description

Device for preventing slag crust generated by electrolysis flue gas pipeline and purification equipment

Technical Field

The utility model belongs to the technical field of electrolytic aluminum, and particularly relates to a device capable of preventing slag shells from being generated in an electrolytic flue gas pipeline and purifying equipment.

Background

In the production of conventional aluminium electrolysis cells, a large amount of fumes containing gaseous fluorides (HF), solid fluorides (fluoride salts) and other pollutants (SO 2, CO, etc.) are produced, called electrolysis fumes. In order to recover useful components in the flue gas and simultaneously purify harmful components in the flue gas, the flue gas of the aluminum electrolysis cell needs to be collected by a smoke discharging pipe network and collected to an aluminum electrolysis flue gas purification system for purification treatment. In the actual operation process, because of the existence of solid fluoride, alumina and water vapor in the flue gas, a slag shell is formed on the inner surfaces of the pipeline and the equipment, and the existence of the slag shell can cause the blockage of conveying equipment in a purification system and a process production system, so that the normal production is affected. In the traditional process, the control on the influence of the slag crust is still kept in the sealing of the reinforcing equipment, so that the penetration of water vapor into a conveying system is reduced, the slag crust is cleaned in a manual or mechanical mode after being generated and peeled off, and the equipment is prevented from being blocked.

Disclosure of Invention

The utility model aims to provide a device for preventing equipment from being blocked by a slag shell generated in a pipeline and a purifying system and automatically cleaning a filter screen to prevent the slag shell generated in an electrolytic flue gas pipeline and the purifying equipment.

The utility model is realized by the following technical scheme:

the utility model relates to a device for preventing slag shells from being generated in an electrolytic flue gas pipeline and purifying equipment, which comprises a shell, a filter screen, a connecting pipe, an air storage tank, a compressed air pipe, a pulse valve, a spray pipe, a dust-free chamber, a branch pipe and a pulse valve pressure switch.

The filter screen is a breathable cloth bag or a steel wire mesh.

And the branch pipe is provided with an exhaust valve.

The technical scheme is as follows: the filter screen is arranged in the shell, the lower end of the filter screen is connected with the connecting pipe, the upper end of the filter screen is connected with the dust-free chamber, the left end and the right end of the dust-free chamber are respectively connected with the spray pipe and the branch pipe, the spray pipe is connected with the air storage tank, the compressed air pipe and the pulse valve are respectively arranged on the air storage tank, and the pulse valve pressure switch is arranged on the shell. In the production process of the aluminum electrolysis cell, in order to prevent the electrolysis flue gas containing a large amount of pollutants from scattering into a workshop, a cover plate is required to be arranged, and the electrolysis flue gas is collected into an electrolysis cell smoke exhaust pipe network through an exhaust hood arranged on an upper structure. In order to avoid the formation of slag shells on the inner surfaces of pipelines and equipment under the combined action of solid fluoride, alumina and water vapor in the flue gas, a flue gas filtering device is arranged beside an exhaust hood of an upper structure of an electrolytic cell, and the solid fluoride and the alumina in the high-temperature flue gas are filtered in the filtering device. Because the solid fluoride in the flue gas is filtered, the filtered electrolytic flue gas lacks the environment for forming the slag crust on the downstream pipeline and the inner surface of the equipment, and the generation of the slag crust can be prevented, thereby solving the problems in the prior art. Because the filter device is arranged in the upper structure of the electrolytic tank, the environment temperature is high, the flue gas temperature is high, and the filter device adopts a high-temperature resistant filter material. Meanwhile, because the inner space of the upper structure of the electrolytic tank is limited, in order to reduce the volume of the filtering device, the filter element of the filtering device adopts a corrugated design, and the same volume can filter and process a large amount of smoke. In order to avoid solid fluoride, alumina and other solid particles in the flue gas from accumulating on the surface of the filter element in the filter device, a compressed air blowing device is arranged for cleaning the solid particles attached to the surface of the filter element. In order to reduce the influence of moisture in the compressed air on the surface of the filter element, one end of a gas storage tank of the blowing device is arranged in the upper structure, and the compressed air is heated by utilizing the high temperature in the electrolytic tank so as to eliminate the adverse influence; the pulse valve of the blowing device is arranged at a position with lower temperature at the other end of the air bag. The compressed air required for the blowing device is supplied from the outside. Depending on the space in which the superstructure is arranged, the blowing devices may be provided one-to-one with the filtering devices. Meanwhile, a mode of intensively arranging the blowing devices and arranging a plurality of pulse valves on the blowing devices to independently clean the filter devices can also be adopted. The upper structure of each electrolytic tank is provided with a plurality of exhaust hoods, and a filtering device is required to be arranged one by one, so that a so-called different-distance system is formed due to different lengths of exhaust pipelines at the rear ends of the filtering devices. In order to ensure the exhaust balance of the filter devices arranged in different ways, exhaust valves are arranged on the branch pipes of each exhaust device, but the same resistance cannot be ensured accurately. In order to ensure that the resistance of each exhaust hood is the same, a pulse valve pressure switch is arranged on the upper part of the filtering device and is interlocked with the negative pressure of the exhaust hood, the pulse valve pressure switch is set with a certain pressure value, when the resistance of each exhaust hood reaches a certain value, the pulse valve pressure switch is opened to control the pulse valve to clean ash, thereby ensuring that the negative pressure on each exhaust hood is the same, and further ensuring that the smoke discharge amount is the same. The lower part of the filtering device is provided with a connecting pipe, alumina and fluoride solid particles in the filtered flue gas are directly discharged into an electrolytic tank at the lower part of the exhaust hood through the connecting pipe, and the connecting pipe also serves as an air inlet of the filtering device. The device for preventing the slag crust from blocking inside the pipeline and the purifying system is realized, and the filter screen is automatically cleaned.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is a state of use diagram of the present utility model.

Reference numerals:

1. the shell, 2, the filter screen, 3, the connecting pipe, 4, the gas holder, 5, the electrolytic tank, 6, the compressed air pipe, 7, the pulse valve, 8, the spray pipe, 9, the dust-free room, 10, the branch pipe, 11, the exhaust valve, 12, the pulse valve pressure switch, 13, the workbin, 14, the blanking pipe, 15, the exhaust hood, 16 and the crust breaking hammer.

Detailed Description

The following detailed description of specific embodiments, structures, features and their functions according to the present utility model is provided with reference to the accompanying drawings and preferred embodiments.

Example 1

The utility model provides a device for preventing electrolysis flue gas pipeline and clarification plant from producing the skull, which comprises a housing 1, filter screen 2, connecting pipe 3, gas holder 4, electrolysis trough 5, compressed air pipe 6, pulse valve 7, spray tube 8, clean room 9, branch pipe 10, discharge valve 11, pulse valve pressure switch 12, a serial communication port, install sack filter screen 2 in the shell 1, the connecting pipe 3 is connected to the lower extreme, clean room 9 is connected to the upper end, spray tube 8 is connected respectively to both ends about the clean room 9, branch pipe 10 is connected to spray tube 8, install compressed air pipe 6 respectively on the gas holder 4, pulse valve 7, install pulse valve pressure switch 12 on the shell 1, install discharge valve 11 on the branch pipe 10, shell 1, gas holder 4 are installed on electrolysis trough 5.

Example 2

The utility model provides a device for preventing electrolysis flue gas pipeline and clarification plant from producing the skull, including shell 1, filter screen 2, connecting pipe 3, gas holder 4, electrolysis trough 5, compressed air pipe 6, pulse valve 7, spray tube 8, clean room 9, branch pipe 10, discharge valve 11, pressure switch 12, a serial communication port, install steel wire mesh filter screen 2 in the shell 1, the connecting pipe 3 is connected to the lower extreme, clean room 9 is connected to the upper end, spray tube 8, branch pipe 10 are connected respectively to both ends about the clean room 9, spray tube 8 connects gas holder 4, install compressed air pipe 6 respectively on the gas holder 4, pulse valve 7, install pulse valve pressure switch 12 on the shell 1, install discharge valve 11 on the branch pipe 10, shell 1, gas holder 4 are installed on electrolysis trough 5.

When the device is used, electrolytic flue gas is collected in the electrolytic tank 5 and enters the connecting pipe 3, passes through the connecting pipe 3 and enters the shell 1, after being filtered by the steel wire gauze filter screen 2 in the shell 1, solid fluoride and alumina in high-temperature flue gas are filtered, and the high-temperature flue gas without the solid fluoride and the alumina passes through the steel wire gauze filter screen 2 and enters the dust-free room 9, passes through the branch pipe 10 and enters the flue gas collecting pipe to be discharged; when the ash of the steel wire mesh filter screen 2 is cleaned, high-pressure gas enters the air storage tank 4 through the compressed air pipe 6 for storage, when the pulse valve pressure switch 12 detects that the negative pressure in the shell 1 reaches a certain value, the pulse valve pressure switch 12 sends out a signal to control the pulse valve 7 to be opened, the high-pressure gas is sprayed out of the air storage tank 4 through the spray pipe 8 and passes through the dust-free chamber 9 to spray air to the steel wire mesh filter screen 2, the ash of the steel wire mesh filter screen 2 is cleaned, and the ash flows out from one end of the connecting pipe 3 and passes through the exhaust hood 15 to enter the electrolytic tank 5.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims

1. The utility model provides a device for preventing electrolysis flue gas pipeline and clarification plant from producing the skull, including shell (1), filter screen (2), connecting pipe (3), gas holder (4), compressed air pipe (6), pulse valve (7), spray tube (8), dust free room (9), branch pipe (10), pulse valve pressure switch (12), its characterized in that installs filter screen (2) in shell (1), connecting pipe (3) are connected to the lower extreme, dust free room (9) are connected to the upper end, spray tube (8), branch pipe (10) are connected respectively to dust free room (9) left and right sides end, gas holder (4) are connected to spray tube (8), install compressed air pipe (6), pulse valve (7) on gas holder (4) respectively, install pulse valve pressure switch (12) on shell (1).

2. The device for preventing the generation of the skull of the electrolytic flue gas pipeline and the purifying equipment according to claim 1, wherein the filter screen (2) is a gas-permeable cloth bag or a steel wire mesh.

3. The device for preventing the generation of the skull of the electrolytic flue gas pipeline and the purifying equipment according to claim 2, wherein the exhaust valve (11) is arranged on the branch pipe (10).