A heat recovery device for prebaked anode aluminum electrolytic cell

Abstract

The present invention provides a pre-baked anode aluminum electrolytic cell heat recovery device, which belongs to the technical field of electrolytic heat recovery, and includes a water tank arranged on the upper part of the electrolytic cell, a filter pipe connected to the vertical direction through a second pipe, and a fan connected to the filter pipe through a third pipe away from the second pipe, wherein a fourth pipe is arranged at one end of the fan away from the third pipe, a first pipe is connected to the electrolytic cell, and an end of the first pipe away from the electrolytic cell extends to the bottom of the water tank, a filter screen is arranged inside the filter pipe, and two sets of baffles are arranged on one side of the filter screen facing the third pipe. The embodiment of the present invention can not only recover the electrolytic heat, but also filter the solid impurities in the heat and purify the fluoride, and has the advantage of good heat recovery effect, and avoids environmental pollution caused by the heat while recycling the heat.

Description

Technical Field

[0001] The invention belongs to the technical field of electrolytic hot gas recovery, in particular to a hot gas recovery device for a prebaked anode aluminum electrolytic cell. Background Art

[0002] Prebaked anode aluminum electrolytic cell is an aluminum electrolytic cell that uses prebaked anode carbon blocks as anodes. The anodes are made of petroleum coke and asphalt, formed by a vibration molding machine, and pre-baked at 900-1200℃ to form anodes, hence the name prebaked anodes.

[0003] Prebaked anode aluminum electrolytic cells tend to produce gas containing a large amount of heat during electrolysis. At present, the electrolytic hot gas is usually collected to be used as energy for power generation equipment or heating equipment to achieve resource utilization of the electrolytic hot gas. However, the electrolytic hot gas contains a large amount of solid impurities and harmful gases, mainly fluorides. These solid impurities and harmful gases are likely to cause environmental pollution and threaten human health when they are utilized as resources. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a heat gas recovery device for a prebaked anode aluminum electrolytic cell.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A heat recovery device for a prebaked anode aluminum electrolytic cell, comprising a water tank arranged on the upper part of the electrolytic cell, a filter pipe connected to the vertical direction through a second pipe, and a fan connected to the filter pipe away from the second pipe through a third pipe, wherein a fourth pipe is arranged at one end of the fan away from the third pipe, a first pipe is connected to the electrolytic cell, and an end of the first pipe away from the electrolytic cell extends to the bottom of the water tank, a filter screen is arranged inside the filter pipe, two groups of baffles are arranged on the side of the filter screen facing the third pipe, a plurality of evenly distributed through holes are formed on the two groups of baffles, and a purification layer is filled between the two groups of baffles, a drive shaft distributed along the horizontal axis direction of the filter pipe is arranged inside the filter pipe, a plurality of fan blades are installed on one end of the drive shaft facing the second pipe, and a scraper assembly for cleaning the filter screen is arranged on the drive shaft.

[0007] As a further improvement of the present invention: the purification layer is composed of a plurality of aluminum oxide particles deposited between two groups of baffles.

[0008] As a further improvement of the present invention: a section of the drive shaft away from the fan blades passes through a group of baffles adjacent to the filter and extends between the two groups of baffles, and a plurality of material shifting rods are fixedly connected to the shaft section of the drive shaft located inside the purification layer.

[0009] As a further improvement of the present invention: the scraper assembly includes a support plate fixedly arranged on the drive shaft and a scraper layer arranged on the side of the support plate facing the filter screen, and the scraper layer is in contact with the side wall of the filter screen.

[0010] As a further improvement of the present invention: the cleaning layer is a brush layer or a sponge layer.

[0011] As a further improvement of the present invention: both upper and lower sides of the filter pipe are provided with through grooves distributed along the length direction of the filter pipe, a sealing plate is embedded in the through groove, and a cover plate is fixedly provided at one end of the sealing plate located outside the filter pipe.

[0012] As a further improvement of the present invention: the side wall of the sealing plate is provided with circumferentially distributed sealing rings.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The embodiment of the present invention can not only recover the electrolytic hot gas, but also filter the solid impurities in the hot gas and purify the fluoride, and has the advantage of good hot gas recovery effect, avoiding environmental pollution caused by hot gas resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a heat gas recovery device for a prebaked anode aluminum electrolytic cell;

[0016] Figure 2 It is a structural schematic diagram of a sealing plate in a heat gas recovery device of a prebaked anode aluminum electrolytic cell;

[0017] Figure 3 for Figure 1 A magnified schematic diagram of the middle A area;

[0018] In the figure: 1-electrolyzer, 2-first pipeline, 3-water tank, 4-second pipeline, 5-filter pipeline, 6-fan blades, 7-drive shaft, 8-cover plate, 9-third pipeline, 10-fan, 11-fourth pipeline, 12-sealing plate, 13-sealing ring, 14-feeding rod, 15-filter screen, 16-scraping layer, 17-support plate, 18-through hole, 19-baffle. DETAILED DESCRIPTION

[0019] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0022] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0023] Example 1

[0024] See also Figure 1 and Figure 3 The present embodiment provides a heat recovery device for a prebaked anode aluminum electrolytic cell, comprising a water tank 3 arranged on the upper part of the electrolytic cell 1, a filter pipe 5 connected to the vertical 3 through a second pipe 4, and a fan 10 connected to the filter pipe 5 away from the second pipe 4 through a third pipe 9, wherein a fourth pipe 11 is arranged at one end of the fan 10 away from the third pipe 9, a first pipe 2 is connected to the electrolytic cell 1, and an end of the first pipe 2 away from the electrolytic cell 1 extends to the bottom of the water tank 3, a filter screen 15 is arranged inside the filter pipe 5, two groups of baffles 19 are arranged on one side of the filter screen 15 facing the third pipe 9, a plurality of evenly distributed through holes 18 are opened on the two groups of baffles 19, and a purification layer is filled between the two groups of baffles 19, a drive shaft 7 distributed along the horizontal axis direction of the filter pipe 5 is arranged inside the filter pipe 5, a plurality of fan blades 6 are installed on one end of the drive shaft 7 facing the second pipe 4, and a scraper assembly for cleaning the filter screen 15 is arranged on the drive shaft 7.

[0025] When in use, the hot air inside the electrolytic cell 1 is drawn into the fourth pipe 11 through the first pipe 2, the water tank 3, the second pipe 4, the filter pipe 5, and the third pipe 9 in sequence through the fan 10, and then sent to the external heating equipment or power generation equipment through the fourth pipe 11, so as to realize the recovery and utilization of hot air; after the hot air enters the bottom of the water tank 3, it floats up along the vertical internal water layer 3. In this process, the solid particles in the hot air enter the water and are separated from the hot air, so as to realize the removal of the solid particles. Then the hot air enters the filter pipe 5 through the second pipe 4, and the solid impurities in the hot air are further filtered through the filter screen 15, and then the hot air is filtered out by the baffle. The through hole 18 on the plate 19 leads into between the two groups of baffles 19, and the purification layer is used to purify and absorb harmful gases in the hot air, and the clean hot air purified and absorbed by the purification layer is sent to the external heating equipment or power generation equipment through the fourth pipeline 11 for resource utilization; when the hot air enters the inside of the filter pipe 5, it first acts on the fan blades 6, and then drives the drive shaft 7 to rotate, and the drive shaft 7 drives the scraper assembly to scrape along the side wall of the filter 15, and then cleans the solid debris attached to the side wall of the filter 15, thereby avoiding excessive adhesion of solid debris to the side wall of the filter 15, causing blockage of the filter 15, and affecting the subsequent filtration of the filter 15.

[0026] Specifically, the purification layer is composed of a plurality of aluminum oxide particles deposited between the two groups of baffles 19. After the hot air passes through the inside of the water tank 3, the hot air contains a certain amount of moisture. The hot air carrying the moisture enters between the two groups of baffles 19 and passes through between the aluminum oxide particles, so that the fluoride in the hot air reacts chemically with the aluminum oxide, thereby achieving the removal of the fluoride and the purification of the harmful gas.

[0027] Specifically, a section of the drive shaft 7 away from the fan blades 6 passes through a group of baffles 19 adjacent to the filter screen 15 and extends between two groups of baffles 19, and a plurality of material moving rods 14 are fixedly connected to the shaft section of the drive shaft 7 located inside the purification layer.

[0028] When the hot air acts on the fan blades 6 and drives the drive shaft 7 to rotate through the fan blades 6, the drive shaft 7 drives the material removal rod 14 to rotate, thereby stirring the alumina particles. While increasing the gap between the alumina particles to facilitate the passage of hot air, it can also improve the extrusion effect of the alumina shell and the hot air, so that the fluoride in the hot air can better contact with the alumina particles, thereby improving the purification effect of the fluoride.

[0029] Specifically, the scraper assembly includes a support plate 17 fixedly disposed on the driving shaft 7 and a scraper layer 16 disposed on a side of the support plate 17 facing the filter screen 15 , and the scraper layer 16 is in contact with a side wall of the filter screen 15 .

[0030] When the fan blades 6 drive the driving shaft 7 to rotate, the driving shaft 7 drives the supporting plate 17 and the scraping layer 16 to rotate, and the scraping layer 16 is used to scrape off the solid debris attached to the side wall of the filter screen 15.

[0031] Specifically, the cleaning layer 16 is a brush layer or a sponge layer.

[0032] The working principle of this embodiment is: when in use, the hot air inside the electrolytic cell 1 is drawn into the fourth pipe 11 through the first pipe 2, the water tank 3, the second pipe 4, the filter pipe 5, and the third pipe 9 in sequence through the fan 10, and then sent to the external heating equipment or power generation equipment through the fourth pipe 11, thereby realizing the recovery and utilization of hot air; after the hot air enters the bottom of the water tank 3, it floats up along the vertical internal water layer 3. In this process, the solid particles in the hot air enter the water and are separated from the hot air, thereby realizing the removal of the solid particles. Then the hot air enters the filter pipe 5 from the second pipe 4, and the solid debris in the hot air is further removed through the filter screen 15. After being filtered, the hot air enters between the two groups of baffles 19 through the through hole 18 on the baffle 19, and the harmful gases in the hot air are purified and absorbed by the purification layer. The clean hot air purified and absorbed by the purification layer is sent to the external heating equipment or power generation equipment through the fourth pipeline 11 for resource utilization; when the hot air enters the inside of the filter pipe 5, it first acts on the fan blades 6, and then drives the drive shaft 7 to rotate. The drive shaft 7 drives the scraper assembly to scrape along the side wall of the filter screen 15, and then the solid debris attached to the side wall of the filter screen 15 is cleaned, thereby avoiding excessive adhesion of solid debris to the side wall of the filter screen 15, causing blockage of the filter screen 15, and affecting the subsequent filtration of the filter screen 15.

[0033] When the hot air acts on the fan blades 6 and drives the drive shaft 7 to rotate through the fan blades 6, the drive shaft 7 drives the material removal rod 14 to rotate, thereby stirring the alumina particles. While increasing the gap between the alumina particles to facilitate the passage of hot air, it can also improve the extrusion effect of the alumina shell and the hot air, so that the fluoride in the hot air can better contact with the alumina particles, thereby improving the purification effect of the fluoride.

[0034] Example 2

[0035] See also Figure 1-3 , a heat recovery device for a prebaked anode aluminum electrolytic cell. Compared with Example 1, the filter pipe 5 is provided with through grooves distributed along the length direction of the filter pipe 5 on both the upper and lower sides, and a sealing plate 12 is embedded in the through groove. The sealing plate 12 is located at one end of the filter pipe 5 and is fixed with a cover plate 8.

[0036] By opening the sealing plate 12 periodically, the alumina particles filled between the two sets of baffles 19 can be replaced.

[0037] Furthermore, the side wall of the sealing plate 12 is provided with sealing rings 13 distributed circumferentially.

[0038] The embodiment of the present invention can not only recover the electrolytic hot gas, but also filter the solid impurities in the hot gas and purify the fluoride, and has the advantage of good hot gas recovery effect, avoiding environmental pollution caused by hot gas resource utilization.

[0039] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A heat recovery device for a prebaked anode aluminum electrolytic cell, characterized in that: The invention comprises a water tank (3) arranged on the upper part of the electrolytic cell (1), a filter pipe (5) connected to the water tank (3) through a second pipe (4), and a fan (10) connected to the filter pipe (5) away from the second pipe (4) through a third pipe (9), wherein a fourth pipe (11) is arranged at one end of the fan (10) away from the third pipe (9), the electrolytic cell (1) is connected to a first pipe (2), and one end of the first pipe (2) away from the electrolytic cell (1) extends to the bottom of the water tank (3), and a filter pipe (5) is arranged inside the filter pipe (5). A filter screen (15) is provided, and two groups of baffles (19) are arranged on the side of the filter screen (15) facing the third pipe (9), and a plurality of evenly distributed through holes (18) are opened on the two groups of baffles (19), and a purification layer is filled between the two groups of baffles (19), and a driving shaft (7) distributed along the horizontal axis direction of the filtering pipe (5) is arranged inside the filtering pipe (5), and a plurality of fan blades (6) are installed on one end of the driving shaft (7) facing the second pipe (4), and a scraper component for cleaning the filter screen (15) is arranged on the driving shaft (7), The purification layer is composed of a plurality of aluminum oxide particles deposited between two groups of baffles (19). A section of the drive shaft (7) away from the fan blade (6) passes through a group of baffles (19) adjacent to the filter screen (15) and extends between two groups of baffles (19), and a plurality of material-moving rods (14) are fixedly connected to the shaft section of the drive shaft (7) located inside the purification layer. The scraper assembly comprises a support plate (17) fixedly arranged on the drive shaft (7) and a scraper layer (16) arranged on the side of the support plate (17) facing the filter screen (15), wherein the scraper layer (16) is in contact with the side wall of the filter screen (15). The scraping layer (16) is a brush layer or a sponge layer. The filter pipe (5) is provided with through grooves distributed along the length direction of the filter pipe (5) on both upper and lower sides, and a sealing plate (12) is embedded in the through groove. A cover plate (8) is fixedly provided at one end of the sealing plate (12) located outside the filter pipe (5). The side wall of the sealing plate (12) is provided with sealing rings (13) distributed in the circumferential direction.

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