CN114196428A

CN114196428A - Pre-baked anode continuous asphalt melting system and melting process

Info

Publication number: CN114196428A
Application number: CN202111341315.9A
Authority: CN
Inventors: 王冉; 韩栋; 王铁军; 李琳; 刘晟; 宋勇勇; 李庆新; 李贵言
Original assignee: Xinjiang Nongliushi Carbon Co ltd
Current assignee: Xinjiang Nongliushi Carbon Co ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-03-18

Abstract

The invention discloses a prebaked anode continuous asphalt melting system and a melting process, wherein the melting system comprises a discharge pit, a solid asphalt buffer tank, a crusher, a melter, a buffer tank and a liquid asphalt buffer tank which are sequentially connected; the melter is provided with a melting area and a slag discharging area, and the melting area is divided into a preliminary melting area and a temperature rising area. Solid asphalt aggregate is continuously added into a melter, the solid asphalt is preliminarily melted in a preliminary melting area, the fluidity is gradually improved, and the solid asphalt is pressed into a heating area under the pressure of the subsequently added solid asphalt to be heated to form low-temperature liquid asphalt; the low temperature liquid asphalt overflows into the buffer tank to be further heated and finally forms high temperature liquid asphalt. Compared with the prior art, the invention can continuously melt the solid asphalt and can maintain higher melting efficiency.

Description

Pre-baked anode continuous asphalt melting system and melting process

Technical Field

The invention relates to the technical field of solid asphalt melting, in particular to a prebaked anode continuous asphalt melting system and a melting process.

Background

In the production process of carbon products such as prebaked anodes, liquid asphalt plays an important role as a binder, and determines whether bulk particles can be formed or not and the yield of the forming process is low, so that the production quality of the prebaked anodes is influenced; at normal temperature, asphalt is in a solid state, the asphalt is melted into liquid in an asphalt melting tank mode at present, and then the liquid is sent into a head tank of a green anode manufacturing workshop under the action of an asphalt pump for anode production and use.

The existing asphalt melting mostly uses a melting tank to melt intermittently, and the melted asphalt still stands and deposits in the melting tank; however, the asphalt melting parameters between the tanks are difficult to ensure to be completely consistent, the asphalt melted in the previous tank affects the asphalt melting in the next tank, and the asphalt residue also affects the asphalt quality to a certain extent, so that the asphalt quality between the tanks is greatly different, and the uniformity of the melted asphalt quality is difficult to ensure, thereby affecting the anode production.

The melting tank has low intermittent melting efficiency, and a plurality of asphalt melting tanks are usually required to be built for ensuring production and use, so that feeding equipment, melting facilities, asphalt conveying facilities, dust collection points and related valves are increased, and the production cost and the equipment floor area are increased.

In addition, in the traditional discontinuous melting process, an electric tar precipitator is adopted to collect and treat asphalt smoke generated in the melting process, however, as asphalt is melted by adopting a discontinuous asphalt melting tank mode, the discharge amount of the asphalt smoke is unstable, and under the action of moisture in the asphalt smoke, along with the advance of running time, the purification efficiency of a purification system is seriously influenced, and the discharge index is easy to exceed the standard.

Therefore, in order to further improve the progress of the baked anode process and technology, and combine the industry technology development trend, further research and development and improvement on the pitch melting technology in the prebaked anode production process are needed.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a melting system and a melting process which can efficiently and continuously melt solid asphalt in the production process of a prebaked anode.

The invention is realized by the following technical scheme:

a continuous asphalt melting system for a prebaked anode comprises a melter and a buffer tank, wherein the melter is provided with a feeding pipe, and solid asphalt aggregates are added into the melter from the feeding pipe; a melting area for melting solid asphalt aggregates is arranged in the melter, the melting area comprises a preliminary melting area and an elevated temperature area, and heating coil groups are arranged in the preliminary melting area and the elevated temperature area;

the heating coil group in the preliminary melting area preliminarily heats and melts the solid asphalt aggregate, the solid asphalt aggregate is heated in the preliminary melting area and then has increased fluidity, and the solid asphalt aggregate is gradually pressed into an elevated temperature area under the pressure of the solid asphalt aggregate subsequently added into the melter;

heating the asphalt aggregate by a heating coil group in the heating area to heat and form low-temperature liquid asphalt; the melter is also provided with an overflow port, and the low-temperature liquid asphalt flows out of the overflow port and enters the buffer tank;

and a heating coil group is also arranged in the buffer tank, and the buffer tank further heats the low-temperature liquid asphalt to form high-temperature liquid asphalt.

Furthermore, the heating coil group in the preliminary melting zone is provided with a plurality of layers of inner coils which are arranged at intervals in the vertical direction; each layer of the inner coil pipe is composed of a plurality of coil pipe rings which are arranged at intervals in the horizontal direction, and the gaps among the coil pipe rings of the plurality of layers of the inner coil pipes are gradually reduced along with the reduction of the height; the solid asphalt aggregate penetrates through gaps among the coil pipe rings, and the solid asphalt aggregate is gradually heated and melted by the inner coil pipes of a plurality of layers in the falling process of the primary melting area; the asphalt aggregate is pressed into the heating area from the bottom of the lowest inner coil pipe after being melted in the primary melting area.

Further, still be provided with agitating unit in the melting zone, agitating unit includes (mixing) shaft and stirring vane, agitating unit stirs the pitch in the melter.

Further, a discharge port is formed in the buffer groove, and a plurality of liquid discharge pipelines are communicated with the discharge port; the melting device is provided with a return pipe which is communicated with a liquid discharge pipeline; and the high-temperature liquid asphalt flows into the liquid discharge pipeline from the discharge port, and a part of the high-temperature liquid asphalt flows into the return pipe through the liquid discharge pipeline and flows back into the melter from the return pipe to accelerate the melting of the solid asphalt aggregate.

Furthermore, the melting system also comprises a plurality of solid asphalt cache tanks, a crusher and a liquid asphalt cache tank, wherein the solid asphalt cache tank, the crusher, the melter, the buffer tank and the liquid asphalt cache tank are sequentially connected; the solid asphalt buffer tank is used for storing solid asphalt, and the bottom of the solid asphalt buffer tank is provided with a constant feeder which quantitatively conveys the solid asphalt to the crusher; the crusher crushes and mixes the solid asphalt to form solid asphalt aggregate, and the formed solid asphalt aggregate is added into the melter from a feeding pipe; and one part of the high-temperature liquid asphalt formed in the buffer tank is conveyed into the liquid asphalt buffer tank through a liquid discharge pipeline for storage.

Further, a temperature measuring point is arranged at an overflow port of the melter and used for detecting the temperature of the liquid asphalt overflowing from the melter.

The invention also provides a prebaked anode continuous asphalt melting process, which comprises the following process steps:

a. continuously adding the mixed solid asphalt aggregate into a melter from a feeding pipe, and primarily heating and melting the solid asphalt aggregate in a primary melting area by a heating coil group to gradually increase the fluidity;

b. under the pressure of the subsequently added asphalt aggregate, the primarily molten asphalt aggregate is gradually pressed into the heating area from the bottom of the heating coil group in the primary melting area, and the heating coil group in the heating area further heats the asphalt aggregate to form low-temperature liquid asphalt;

c. along with the increase of the feeding amount and the melting time, the liquid level of the low-temperature liquid asphalt in the melting device is gradually increased, the low-temperature liquid asphalt overflows into the buffer tank from the overflow port, and the buffer tank further heats the low-temperature liquid asphalt to form high-temperature liquid asphalt;

d. and a part of the high-temperature liquid asphalt flowing out of the discharge port of the buffer tank flows back to the melter to accelerate the melting of the solid asphalt aggregate in the melter.

Further, a heat conducting medium in the heating coil group is heat conducting oil, and the temperature of the heat conducting oil introduced into the heating coil group is 260-280 ℃; the temperature of the low-temperature liquid asphalt formed in the processes a and b is 150-180 ℃, and the temperature of the high-temperature liquid asphalt formed in the process c is 200-220 ℃.

Further, when the melter is operated for the first time, the solid asphalt aggregate is intermittently conveyed into the melter according to the asphalt melting condition in the melter; after liquid asphalt overflows from the melter, the continuous feeding is adjusted, and the feeding amount is gradually adjusted from small to large according to the melting condition of the solid asphalt.

Furthermore, the opening degree of a heat conducting oil inlet valve of a heating coil group in the melter is controlled according to the temperature of the low-temperature liquid asphalt detected by a temperature measuring point arranged at an overflow port of the melter, so that the melting speed of the solid asphalt and the temperature of the low-temperature liquid asphalt are controlled.

Compared with the prior art, the invention has the advantages that:

1. through the setting of solid pitch buffer tank, melter, buffer tank and liquid pitch buffer tank, can play and deposit solid pitch and liquid pitch to can the high-efficient effect of melting solid pitch in succession.

2. Through the setting of melting zone and agitating unit, can play the effect that improves solid pitch melting efficiency.

3. Through the arrangement of the preliminary melting area, the heating area and the multilayer inner coil pipes, the effect of melting asphalt step by step so as to improve the melting efficiency can be achieved.

4. By re-feeding the high-temperature liquid asphalt in the buffer tank into the melter, it is possible to achieve the effect of promoting the melting of the fixed asphalt and thus improving the asphalt melting efficiency.

5. Through the setting of liquid pitch clean-out valve and sediment case, can play the effect of clearing up the melter.

6. Through the arrangement of the access hole, a worker can enter the melter from the access hole for overhauling.

Drawings

FIG. 1 is a schematic view of the overall structure of a continuous pitch melting system for prebaked anodes according to the present invention;

FIG. 2 is a schematic view of the overall construction of the melter of the present invention;

FIG. 3 is a schematic diagram of an inner coil structure according to an embodiment of the present invention;

FIG. 4 is a schematic view showing the overall structure of a buffer tank according to the present invention;

FIG. 5 is a schematic flow diagram of the continuous pitch melting process for prebaked anodes of the present invention;

FIG. 6 is a schematic diagram of the process of melting solid pitch in the present invention.

1. A solid asphalt buffer tank; 2. a constant feeder; 3. a bucket elevator; 4. a crusher; 5. a melter; 6. a buffer tank; 7. a feed pipe; 8. a melting zone; 9. a slag discharge area; 10. a stirring device; 11. heating the coil assembly; 12. an overflow port; 13. a return pipe; 14. a slag settling tank; 15. an overflow feed port; 16. a discharge port; 17. measuring temperature points; 18. closing the coil ring; 19. connecting ribs; 20. a preliminary melting zone; 21. a temperature rising zone; 22. an inner coil pipe; 23. a stirring blade.

Detailed Description

The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1, a prebaked anode continuous pitch melting system according to an embodiment of the present invention includes a discharge pit, a solid pitch buffer tank 1, a crusher 4, a melter 5, a buffer tank 6, and a liquid pitch buffer tank (wherein the discharge pit and the liquid pitch buffer tank are not shown in fig. 1). In the production process, the transport vehicle discharges the solid asphalt into a discharge pit, and the discharge pit and the solid asphalt buffer tank 1 can be connected through a belt conveyor, a bucket elevator 3 and other common solid asphalt conveying devices (not shown in the figure). Solid asphalt with different qualities and specifications is conveyed from the discharge pit to different solid asphalt buffer tanks 1 by a solid asphalt conveying device for storage.

As shown in fig. 1, a quantitative feeder 2 is installed at the bottom of a solid asphalt buffer tank 1, the quantitative feeder 2 is connected with a crusher 4, and the crusher 4 can be a ring hammer crusher 4 which is commonly used at present. During production, according to production requirements, the solid asphalt cache tanks 1 respectively release solid asphalt with different qualities and specifications quantitatively through the quantitative feeder 2 according to the aggregate proportion, and the solid asphalt with different qualities is conveyed into the crusher 4 through the quantitative feeder 2 to be crushed and mixed into solid asphalt aggregate required by production; in this embodiment, the crusher 4 is connected to the melter 5 by the bucket elevator 3, the top of the melter 5 is provided with a feeding pipe 7, and the crushed and mixed solid asphalt aggregate is conveyed from the feeding pipe 7 to the melter 5 by the bucket elevator 3.

As shown in fig. 1 and 2, the melter 5 has a melting zone 8, and a stirring device 10 (the stirring device is composed of a motor, a speed regulator, a rotating shaft, a blade and the like, is a conventional device in a reaction kettle, a stirrer and the like, and therefore, will not be described in detail here) is arranged in the melting zone 8. In this embodiment, the melting zone 8 further includes a preliminary melting zone 20 and an elevated temperature zone 21, and the heating coil groups 11 are disposed in both the preliminary melting zone 20 and the elevated temperature zone 21. The solid asphalt is continuously fed into the melter 5 from the feeding pipe 7 of the melter 5, and under the stirring action of the stirring device 10, the solid asphalt is scattered and uniformly mixed, and simultaneously, the solid asphalt is heated more uniformly. In the preliminary melting zone 20, the heating coil group 11 in the preliminary melting zone 20 is arranged into a plurality of layers of inner coils 22, and the plurality of layers of inner coils 22 are arranged at intervals in the vertical direction; each layer of the coil 22 is formed by a plurality of coil rings (refer to fig. 3) which are arranged at intervals in the horizontal direction, the solid asphalt aggregate penetrates through the gaps between the coil rings of the inner coil 22, and the coil rings heat and melt the solid asphalt aggregate.

In order to improve the melting efficiency and the melting quality, the gaps among the coil rings of the inner coils 22 of the plurality of layers are gradually decreased along with the reduction of the height of the inner coil 22, so that the solid asphalt aggregate can be gradually melted; during the falling of the solid asphalt aggregate in the preliminary melting zone 20, the solid asphalt blocks are gradually melted, the size of the solid asphalt blocks is gradually reduced, and the fluidity of the asphalt is gradually increased, so that the solid asphalt aggregate can rapidly pass through the coils 22 in each layer; this prevents the solid asphalt from being accumulated and blocked on the inner coil 22, thereby facilitating the rapid and sufficient melting of the solid asphalt and improving the melting efficiency.

As shown in fig. 3, in the actual production process, the inner coil 22 may be composed of a plurality of concentrically arranged closed coil rings 18, the plurality of closed coil rings 18 are arranged at intervals, and adjacent closed coil rings 18 may be connected by a connecting rib 19; in another embodiment, the inner coil 22 may be formed by a coil ring wound such that the inner coil 22 is in the form of a spiral in a horizontal plane (not shown). Of course, several straight pipes may be uniformly spaced to form a grid instead of the inner coil 22 of the present embodiment.

As shown in fig. 2, the inner coil 22 primarily heats and melts the solid asphalt. The fluidity of the primarily melted asphalt is gradually increased, and as the solid asphalt aggregate is continuously added to the feeding pipe 7, the primarily melted asphalt is gradually pressed into the heating area 21 from the bottom of the inner coil 22 at the lowest layer under the pressure of the subsequent asphalt, and the heating coil group 11 in the heating area 21 further heats the asphalt. In the actual production process, the downward movement of the asphalt can be accelerated by changing the shape of the stirring blade 23 of the stirring device 10. For example, the stirring blade 23 may be a helical auger blade, or the bending angle of the stirring blade 23 may be changed, so that the asphalt can be stirred and pushed downward during the rotation process, thereby facilitating the pressing of the asphalt into the heating region 21 from the coil ring gap of the lower inner coil 22.

The heating zone 21 further heats, dehydrates, precipitates impurities and finally melts the asphalt into low temperature liquid asphalt. As the heating time increases, the level of the low temperature liquid asphalt in the melter 5 gradually increases; in this embodiment, an overflow port 12 is provided on the side wall of the melter 5 near the top, and the low-temperature liquid asphalt continuously flows out from the overflow port 12. Thus, during the melting process, solid asphalt aggregates can be continuously added to the melter, and the melter can also continuously discharge low-temperature liquid asphalt, thereby realizing continuous melting of asphalt.

As shown in fig. 2 and 4, an overflow feed port 15 is provided at the top of the buffer tank 6, and the low-temperature liquid asphalt flowing out of the overflow port 12 of the melter 5 enters the buffer tank 6 through the overflow feed port 15. A heating coil group 11 is also arranged in the buffer tank 6, and the heating coil group 11 further heats the low-temperature liquid asphalt to raise the temperature of the low-temperature liquid asphalt and meet the process requirements. The low-temperature liquid asphalt is heated in the buffer tank 6 to form high-temperature liquid asphalt, a discharge port 16 is arranged at the bottom of the buffer tank 6, a plurality of liquid drainage pipelines are communicated with the discharge port 16, and the buffer tank 6 is respectively communicated with the liquid asphalt buffer tank and the melter 5 through the liquid drainage pipelines. In this embodiment, a return pipe 13 is disposed at the top of the melter 5, a discharge port 16 of the buffer tank 6 is communicated with the return pipe 13 through a liquid discharge pipe, and a part of high-temperature asphalt is re-conveyed into the melter 5 through the return pipe 13, so as to accelerate melting of the solid asphalt in the melter 5 and improve melting efficiency. Most of high-temperature asphalt is conveyed to a liquid asphalt buffer tank through an asphalt pump for storage, the high-temperature asphalt is stood and precipitated in the liquid asphalt buffer tank, and when the high-temperature asphalt needs to be used, the high-temperature asphalt is quantitatively conveyed to an anode production workshop for anode production.

As shown in fig. 2, in the present embodiment, the melter 5 is further provided with a slag discharge area 9, the slag discharge area 9 is located below the melting area 8, and the heating coil group 11 is also provided in the slag discharge area 9. The slag discharging area 9 is arranged to be conical, a liquid asphalt drain valve is arranged on the slag discharging area 9, a slag box 14 is arranged at the bottom of the slag discharging area 9, and an access hole is formed in the slag discharging area 9. During the melting process, the liquid asphalt rises along with the increase of the melting time, and overflows from the overflow port 12, and the asphalt slag enters the slag discharging area 9. When the melter 5 needs to be overhauled, the liquid asphalt emptying valve is opened to empty the liquid asphalt in the melter 5, and then the valve is opened to discharge asphalt slag substances accumulated in the slag discharge area 9 into the slag depositing box 14 at the bottom; when the liquid asphalt and the asphalt slag are completely discharged, the staff opens the access hole and enters the melter 5 from the access hole to overhaul the element.

Referring to fig. 5 and 6, the continuous melting process of solid asphalt according to the present invention is as follows: firstly, respectively subpackaging solid asphalt into different solid asphalt buffer tanks 1 according to quality and specification, and quantitatively conveying the solid asphalt with different quality and specification to a ring hammer type crusher 4 for crushing and mixing to form solid asphalt aggregate by the solid asphalt buffer tank 1 through a quantitative feeder 2 according to production requirements during production;

the crusher 4 conveys the solid asphalt aggregate into the melter 5, and the melter 5 melts the solid asphalt aggregate to form low-temperature liquid asphalt; as the melting time increases, the low temperature liquid asphalt level in melter 5 gradually rises and eventually overflows overflow port 12 of melter 5; the low-temperature liquid asphalt overflows into the buffer tank 6 from the overflow port 12, and the buffer tank 6 can further heat the low-temperature liquid asphalt to form high-temperature liquid asphalt meeting the process requirements;

most of high-temperature liquid asphalt is conveyed into a liquid asphalt buffer tank through an asphalt conveying pump and a conveying pipeline for standing and precipitation, and is quantitatively conveyed to a workshop for anode production and use when required; part of the high-temperature liquid pitch is returned to the melter 5 again to accelerate the melting of the solid pitch in the melter 5, thereby improving the melting efficiency.

Compared with the traditional melting tank and intermittent melting mode, the invention firstly melts the solid asphalt into low-temperature liquid asphalt through the melter 5, then further heats the low-temperature liquid asphalt through the buffer tank 6, and finally stores the liquid asphalt in the liquid asphalt buffer tank. Compared with the prior art, the continuous asphalt melting process is completed and the melting efficiency is improved by matching the melter 5, the buffer tank 6 and the liquid asphalt buffer tank.

At present, along with the improvement of current density for anode carbon block products and environmental protection requirements in the production process, high-temperature modified asphalt with the softening point of 100-110 ℃ is mostly used. By using the melting process and the melting system provided by the invention, the heating medium introduced into the heating coil group 11 in the melter 5 and the buffer tank 6 is heat-conducting oil, the temperature of the heat-conducting oil is controlled to be 260-280 ℃ during production, and in the melter 5, the solid asphalt is heated by the heat-conducting oil to form low-temperature liquid asphalt with the temperature of 150-180 ℃; in the buffer tank 6, the low-temperature liquid asphalt is further heated to 200-220 ℃ which meets the process requirement. In addition, a temperature measuring point 17 (refer to fig. 2) may be provided at the overflow port 12 of the melter 5 for monitoring the asphalt temperature, which can be kept within a set range during continuous melting. The opening degree of the heat conducting oil inlet valve is controlled according to the temperature measurement result of the temperature measurement point 17, so that the melting speed and the temperature of the solid asphalt are controlled. In order to ensure the melting quality of the asphalt, when the melter 5 is operated for the first time, the material is intermittently fed according to the melting condition of the asphalt in the melter 5 until liquid asphalt flows into the buffer tank 6 from the overflow port 12, the material is continuously fed, and the feeding amount is gradually adjusted from small to large according to the melting condition of the solid asphalt.

The invention carries out split melting and heating combined melting on the solid asphalt through the melter 5 and the buffer tank 6, thereby realizing continuous melting on the asphalt and improving the asphalt melting efficiency.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The continuous asphalt melting system for the prebaked anode is characterized by comprising a melter (5) and a buffer tank (6), wherein a feeding pipe (7) is arranged on the melter (5), and solid asphalt aggregates are added into the melter (5) from the feeding pipe (7); a melting area (8) for melting solid asphalt aggregates is arranged in the melter (5), the melting area (8) comprises a preliminary melting area (20) and an elevated temperature area (21), and heating coil groups (11) are arranged in the preliminary melting area (20) and the elevated temperature area (21);

the heating coil group (11) in the preliminary melting zone (20) is used for preliminarily heating and melting the solid asphalt aggregate, the solid asphalt aggregate is heated by the preliminary melting zone (20) and then has increased fluidity, and is gradually pressed into the heating zone (21) under the pressure of the solid asphalt aggregate subsequently added into the melter (5);

a heating coil group (11) in the heating area (21) heats the asphalt aggregate to form low-temperature liquid asphalt; the melter (5) is also provided with an overflow port (12), and the low-temperature liquid asphalt flows out from the overflow port (12) and enters the buffer tank (6);

a heating coil group (11) is arranged in the buffer tank (6), and the buffer tank (6) further heats the low-temperature liquid asphalt to form high-temperature liquid asphalt.

2. The continuous asphalt melting system of prebaked anode according to claim 1, wherein the heating coil group (11) in the preliminary melting zone (20) is provided as a plurality of layers of inner coils (22), the plurality of layers of inner coils (22) being arranged vertically spaced from each other; each layer of the inner coil pipe (22) is composed of a plurality of coil pipe rings which are arranged at intervals in the horizontal direction, and the gaps among the coil pipe rings of the plurality of layers of the inner coil pipes (22) are gradually reduced along with the reduction of the height; the solid asphalt aggregate passes through the gaps among the coil rings, and is gradually heated and melted by the inner coil pipes (22) of a plurality of layers in the falling process of the primary melting area (20); the asphalt aggregate is pressed into the heating area (21) from the bottom of the lowest inner coil pipe (22) after being melted in the primary melting area (20).

3. The continuous pitch melting system of claim 1, wherein a stirring device (10) is further disposed in the melting zone (8), the stirring device (10) comprises a stirring shaft and stirring blades (23), and the stirring device (10) stirs the pitch in the melter (5).

4. The continuous asphalt melting system with the prebaked anode according to claim 1, wherein a discharge port (16) is formed in the buffer tank (6), and a plurality of liquid discharge pipelines are communicated with the discharge port (16); a return pipe (13) is arranged on the melter (5), and the return pipe (13) is communicated with a liquid discharge pipeline; the high-temperature liquid asphalt flows into a liquid discharge pipeline from a discharge port (16), and a part of the high-temperature liquid asphalt flows into a return pipe (13) through the liquid discharge pipeline and returns to a melter (5) from the return pipe (13) to accelerate the melting of solid asphalt aggregates.

5. The continuous asphalt melting system with prebaked anodes according to claim 4, further comprising a plurality of solid asphalt buffer tanks (1), a crusher (4) and a liquid asphalt buffer tank, wherein the solid asphalt buffer tank (1), the crusher (4), the melter (5), the buffer tank (6) and the liquid asphalt buffer tank are connected in sequence; the solid asphalt buffer tank (1) is used for storing solid asphalt, a constant feeder (2) is arranged at the bottom of the solid asphalt buffer tank, and the constant feeder (2) quantitatively conveys the solid asphalt into the crusher (4); the crusher (4) crushes and mixes the solid asphalt to form solid asphalt aggregate, and the formed solid asphalt aggregate is added into the melter (5) from the feeding pipe (7); and a part of the high-temperature liquid asphalt formed in the buffer tank (6) is conveyed into the liquid asphalt buffer tank through a liquid discharge pipeline for storage.

6. The continuous asphalt melting system with prebaked anodes according to claim 1, wherein a temperature measuring point (17) is provided at an overflow port (12) of the melter (5), and the temperature measuring point (17) is used for detecting the temperature of the liquid asphalt overflowing from the melter (5).

7. A prebaked anode continuous asphalt melting process is characterized by comprising the following process steps:

a. continuously adding the mixed solid asphalt aggregate into a melter (5) from a feeding pipe (7), and enabling the solid asphalt aggregate to enter a primary melting area (20) to be primarily heated and melted by a heating coil group (11) and gradually increase the fluidity;

b. under the pressure of the subsequently added asphalt aggregate, the primarily molten asphalt aggregate is gradually pressed into the heating area (21) from the bottom of the heating coil group (11) in the primary melting area (20), and the heating coil group (11) in the heating area (21) further heats the asphalt aggregate to form low-temperature liquid asphalt;

c. along with the increase of the feeding amount and the melting time, the liquid level of the low-temperature liquid asphalt in the melter (5) is gradually increased, the low-temperature liquid asphalt overflows into the buffer tank (6) from the overflow port (12), and the buffer tank (6) further heats the low-temperature liquid asphalt to form high-temperature liquid asphalt;

d. a part of the high-temperature liquid asphalt flowing out of the discharge port (16) of the buffer tank (6) flows back to the melter (5) to accelerate the melting of the solid asphalt aggregate in the melter (5).

8. The continuous asphalt melting process with the prebaked anode according to claim 7, wherein the heat conducting medium in the heating coil group (11) is heat conducting oil, and the temperature of the heat conducting oil introduced into the heating coil group (11) is 260-280 ℃; the temperature of the low-temperature liquid asphalt formed in the processes a and b is 150-180 ℃, and the temperature of the high-temperature liquid asphalt formed in the process c is 200-220 ℃.

9. The continuous asphalt melting process of prebaked anode according to claim 7, wherein said melter (5) is operated for the first time, solid asphalt aggregates are intermittently fed into the melter (5) according to the asphalt melting condition in the melter (5); after liquid asphalt overflows from the melter (5), the continuous feeding is adjusted, and the feeding amount is gradually adjusted from small to large according to the melting condition of the solid asphalt.

10. The continuous asphalt melting process with prebaked anodes according to claim 7, characterized in that the opening degree of the heat transfer oil inlet valve of the heating coil group (11) in the melter (5) is controlled according to the temperature of the low-temperature liquid asphalt detected by a temperature measuring point (17) arranged at the overflow port (12) of the melter (5), thereby controlling the melting speed of the solid asphalt and the temperature of the low-temperature liquid asphalt.