A melting furnace system for fly ash resource utilization

Abstract

The application discloses a kind of for fly ash resourceful melting furnace system, specifically relates to environmental protection technical field, the conduit of three groups of electric arc generator connection moves under the action of lifting and horizontal moving component and passes through the inside of three auxiliary feed ports to reach inside furnace body, and connect the blanker with middle feed port and the rest auxiliary feed port, for the blanking of fly ash raw material, simultaneously or intermittently blanking in different positions, ensure that material feeding is uniform and melting is uniform, avoid the situation such as uneven melting, improve the melting efficiency of electric arc generator, and the high-temperature arc generated by electric arc generator is transferred to the conduit, the fly ash in the furnace body is heated to a sufficient temperature by the conduit, so that it is melted into liquid state, which can quickly melt after ensuring that the material enters the inside of the molten pool of the furnace body, and does not affect the normal operation between electrodes, plays the role of energy saving, high efficiency and the like.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, specifically to a melting furnace system for fly ash resource utilization. Background Technology

[0002] Fly ash produced by waste incineration is classified as hazardous waste due to its complex composition and the presence of toxic components and heavy metals. The main methods for treating fly ash from waste incineration at home and abroad are melting and sintering, separation and extraction, and solidification and stabilization. Among them, melting and sintering is the method with the highest volume reduction and the best solidification effect of fly ash from waste incineration.

[0003] A search revealed that the invention patent with publication number CN113701163A discloses a high-temperature melting treatment system for fly ash, which uses natural gas for combustion heating, resulting in high efficiency in combustion and melting, less pollution and impurities in the exhaust gas after fly ash incineration, and a higher overall fly ash resource utilization rate.

[0004] However, in the above technical solutions, in order to connect the feeding device, the feed port is usually set on one side of the melting furnace, which causes the fly ash raw material to enter the interior of the melting furnace from one side. This results in the problem that there is more fly ash raw material on one side and less on the other side when feeding. Uneven feeding leads to uneven melting of fly ash and affects the melting effect. Summary of the Invention

[0005] The purpose of this invention is to provide a melting furnace system for fly ash resource utilization, so as to solve the problem mentioned in the background art that there is more fly ash on one side and less on the other side during feeding, and the uneven feeding leads to uneven melting of fly ash.

[0006] This invention can be achieved through the following technical solution: a melting furnace system for fly ash resource utilization, comprising a furnace body, a supporting base provided on the bottom surface of the furnace body, and a furnace cover rotatably installed on the top surface of the furnace body. Three sets of electric arc generators for melting fly ash in the furnace body are provided above the furnace cover. The end of each set of electric arc generators is connected to a conduit. A lifting and traversing assembly for controlling the simultaneous movement of the three sets of electric arc generators is provided on the top surface of the supporting base and on one side of the furnace body. The lifting and traversing assembly includes two support columns, and a sliding seat is slidably installed between the two support columns. A supporting mechanism for supporting the three sets of electric arc generators is provided on the inner wall of the sliding seat. A central feed port for fly ash raw material is provided in the middle of the top surface of the furnace cover, and nine auxiliary feed ports for auxiliary entry of fly ash raw material and vertical entry of conduit are provided on the top surface of the furnace cover outside the central feed port.

[0007] A further technical improvement of the present invention is that: six auxiliary feed ports are arranged in a ring and located outside the central feed port, and the other three auxiliary feed ports are located outside the six auxiliary feed ports arranged in a ring. Three of the six auxiliary feed ports are used for the auxiliary entry of fly ash raw materials, and the other three auxiliary feed ports are used for the entry of the end of the conduit.

[0008] A further technical improvement of the present invention is that: the end of the arc generator is connected to a fixing block for fixing the conduit, and the fixing block has an arc-shaped structure.

[0009] A further technical improvement of the present invention is that: the supporting mechanism includes an upper lifting plate, a mounting plate, and a lower lifting plate from top to bottom. The ends of the upper lifting plate, the mounting plate, and the lower lifting plate are all fixed to the outer wall surface of the sliding seat. Multiple vertical plates are installed between the lower lifting plate and the upper lifting plate. Fixed housing one and fixed housing two for supporting and installing each group of arc generators are rotatably installed on the surfaces of the mounting plate and the lower lifting plate, respectively. A connecting column is installed between the fixed housing one and the fixed housing two. The surface of the mounting plate is provided with through holes for the connecting column to pass through.

[0010] A further technical improvement of the present invention is that: a connecting plate that is fixed to the end of each set of arc generators is installed inside the first fixed housing and the second fixed housing, and an electric push rod for pushing the connecting plate is installed on the outer wall surface of the first fixed housing and the second fixed housing, and a spring is sleeved on one end of the connecting plate that extends into the inner cavity of the first fixed housing.

[0011] A further technical improvement of the present invention is that: water cooling pipes for cooling are arranged around the top edge of the furnace cover and the outer surface of the furnace body, an exhaust port is provided at the top end of the furnace cover, and a discharge port for discharging material is provided on one side surface of the furnace body.

[0012] A further technical improvement of the present invention is that: four electric support rods for supporting the stability of the furnace body are installed on the bottom surface of the bearing base, and the telescopic end of each electric support rod is hinged to the bottom surface of the bearing base.

[0013] A further technical improvement of the present invention is that each group of arc generators is connected to a water-cooled cable, which is guided to the transformer by the erection of structural columns.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The conduits connected to the three sets of electric arc generators move under the action of the lifting and traversing components and pass through any three of the six auxiliary feed ports to reach the furnace body. This avoids the three conduits entering the furnace body adjacent to each other, which would cause uneven melting of fly ash. The feeder is connected to the central feed port and the other auxiliary feed ports. Through the electric valve at the bottom of the feed buffer bin and the metering screw conveyor of the feeder, the material is dropped at different positions simultaneously or intermittently to ensure uniform feeding and melting of materials. This avoids uneven melting and improves the melting efficiency of the electric arc generator. The high-temperature electric arc generated by the electric arc generator is transferred to the conduits, which heat the fly ash in the furnace body to a sufficient temperature to melt it into a liquid state.

[0016] 2. Fixed sleeve one rotates together with fixed sleeve two under the connection of the connecting column. By changing the rotation angle of fixed sleeve one and fixed sleeve two, it is convenient to align the conduit connected to the arc generator with the slot of the auxiliary feed port. By sliding the sliding seat up and down in the support column, it is convenient to insert the conduit into the cavity through the auxiliary feed port to melt the fly ash.

[0017] 3. By extending the electric support rod, the electric support rod drives one side of the bearing base to rise, and then the electric support rod on the other side drives the other side of the bearing base to rise. This process is repeated, causing the supporting furnace body and the supporting arc generator to deflect together. Through the reciprocating left and right lifting action design, the fly ash in the furnace body melts more evenly and fully, improving the melting efficiency.

[0018] 4. The molten slurry and refractory are cooled by contact with the molten material through the temperature of the melt and the water cooling temperature of the water cooling pipe, forming a eutectic protective layer of molten slurry and refractory. This can provide a certain degree of protection for the refractory and prevent it from being consumed due to high temperature and corrosion, thereby extending the service life of the furnace. Attached Figure Description

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a cross-sectional view of the structure of the present invention;

[0021] Figure 2 This is a top view of the structure of the present invention;

[0022] Figure 3 This is a cross-sectional view of the connecting plate and the fixing sleeve of the present invention;

[0023] Figure 4 For the present invention Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 5 This is a schematic diagram of the structural connection between the support column and the upper lifting plate of the present invention.

[0025] In the diagram: 1. Support base; 2. Furnace body; 3. Discharge port; 4. Guide tube; 5. Furnace cover; 6. Electric support rod; 7. Support column; 8. Upper lifting plate; 9. Structural column; 10. Transformer; 11. Exhaust port; 12. Observation port; 13. Fixing block; 14. Arc generator; 15. Fixing sleeve one; 16. Central feed port; 17. Auxiliary feed port; 19. Electric push rod; 20. Water cooling pipe; 21. Connecting plate; 22. Mounting plate; 23. Through hole; 24. Fixing sleeve two; 25. Vertical plate; 26. Connecting column; 27. Lower lifting plate; 28. Sliding seat. Detailed Implementation

[0026] To further illustrate the technical means and effects of the present invention in achieving the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0027] Please see Figures 1-5 As shown, the present invention provides a melting furnace system for fly ash resource utilization, including a furnace body 2, a supporting base 1 on the bottom surface of the furnace body 2, and a furnace cover 5 rotatably mounted on the top surface of the furnace body 2. Three sets of electric arc generators 14 for melting fly ash in the supporting base 1 are arranged above the furnace cover 5. Each set of electric arc generators 14 is connected to a conduit 4 at its end. A lifting and traversing assembly for controlling the simultaneous movement of the three sets of electric arc generators 14 is arranged on the top surface of the supporting base 1 and on one side of the furnace body 2. The lifting and traversing assembly includes two support columns 7, and a sliding seat 28 is slidably installed between the two support columns 7. The inner wall of the sliding seat 28 is provided with a supporting mechanism for supporting the three sets of electric arc generators 14. A central feed port 16 for fly ash raw material to enter is provided in the middle of the top surface of the furnace cover 5, and nine auxiliary feed ports 17 for auxiliary entry of fly ash raw material and vertical entry of conduit 4 are provided on the top surface of the furnace cover 5 and outside the central feed port 16.

[0028] After batching, the raw materials are transported to the feed buffer silo to await feeding. A certain mass of fly ash raw material is conveyed through the electric valve at the bottom of the feed buffer silo and the metering screw of the feeder. During the melting of fly ash, the guide pipes 4 connected to the three sets of electric arc generators 14 move under the action of the lifting and traversing components and pass through the interior of three auxiliary feed ports 17 to reach the furnace body 2. The feeder is then connected to the central feed port 16 and the remaining auxiliary feed ports 17 for the fly ash raw material to fall into the furnace at different locations simultaneously or intermittently. The material is dropped off to improve the melting efficiency of the electric arc generator 14. The high-temperature electric arc generated by the electric arc generator 14 is transferred to the conduit 4, which heats the fly ash in the furnace body 2 to a sufficient temperature to melt it into a liquid state. The furnace body 2 uses chromium-cadmium material, which is more resistant to fly ash corrosion. The temperature inside the furnace body 2 is controlled to be maintained at 1400-1600 degrees Celsius. The raw material feed rate and bottom discharge rate are controlled to ensure that the raw material stays in the furnace body 2 for 1-5 hours. The feed absorbs heat, the discharge carries away heat, and the heat energy is balanced.

[0029] The gaseous products inside furnace body 2 enter the flue gas cooler. Under the action of cold air blown in by the cooling fan, the flue gas temperature is reduced from 1300℃ to 800℃, avoiding the adhesion of secondary fly ash. The medium-temperature flue gas after the flue gas is cooled in the quench tower and rapidly cooled to below 200℃ within 1 second, avoiding the low-temperature resynthesis of dioxins. The flue gas after quenching enters the bag filter for dust removal. Secondary fly ash is periodically discharged from the bag filter. The flue gas after dust removal enters the alkaline scrubbing tower, where sulfur dioxide, HCl, HF and other acidic gases are further removed by a 10% sodium hydroxide alkaline solution. The flue gas that meets the strict emission standards is sent into the chimney by the induced draft fan and discharged into the atmosphere.

[0030] Please see Figure 1-2 As shown, a total of nine auxiliary feed inlets 17 are provided. Six of the auxiliary feed inlets 17 are arranged in a ring outside the central feed inlet 16, and the other three are located outside the six ring-shaped auxiliary feed inlets 17. Observation ports 12 are provided on one side of the edge of the other three auxiliary feed inlets 17. Three of the six auxiliary feed inlets 17 are used for the auxiliary entry of fly ash raw materials, and the other three are used for the end entry of the conduit 4. The conduit 4 is controlled by a lifting and sliding assembly to enter different auxiliary feed inlets 17, avoiding the need for three... One conduit 4 enters the furnace body 2 nearby, and the fly ash raw material is accurately transported into the interior of the furnace body 2 through the central feed port 16, with a feed rate of about 40-50%; the feed rate of the three auxiliary feed ports 17 around the upper electrode of the electric arc generator 14 is 30-45%, and the feed rate of the three auxiliary feed ports 17 around the outer electrode is about 5-30%. By controlling the simultaneous or intermittent feeding at different points, the feed rate and the melting of the raw material are precisely controlled to ensure that the material is melted within 30s-2min, ensuring uniform feeding and melting of the material, and avoiding uneven melting.

[0031] Please see Figure 2 As shown, the end of the arc generator 14 is connected to a fixing block 13 for fixing the conduit 4. The fixing block 13 has an arc-shaped structure, and the conduit 4 is fixed to the end of the arc generator 14 by the arc-shaped fixing block 13.

[0032] Please see Figure 1 and Figure 5 As shown, the supporting mechanism includes an upper lifting plate 8, a mounting plate 22, and a lower lifting plate 27 from top to bottom. The ends of the upper lifting plate 8, mounting plate 22, and lower lifting plate 27 are all fixed to the outer wall of the sliding seat 28. Multiple vertical plates 25 are installed between the lower lifting plate 27 and the upper lifting plate 8. Fixed housing 15 and fixed housing 24 for supporting and installing each group of arc generators 14 are rotatably mounted on the surfaces of the mounting plate 22 and the lower lifting plate 27, respectively. A connecting column 26 is installed between the fixed housing 15 and the fixed housing 24. The surface of the mounting plate 22 is provided with a through-hole for the connecting column 26 to pass through. As the hole 23 and sliding seat 28 move up and down, they drive the bearing mechanism to move together. The fixed sleeve 15 and fixed sleeve 24 follow the rise and fall. The fixed sleeve 15 is driven by the servo motor. The fixed sleeve 15 rotates together with the fixed sleeve 24 under the connection of the connecting column 26, changing the rotation angle of the fixed sleeve 15 and fixed sleeve 24. This makes it easier to align the conduit 4 connected to the arc generator 14 with the hole and groove of the auxiliary feed port 17. The sliding seat 28 slides up and down in the support column 7, making it easy for the conduit 4 to be inserted into the furnace body 2 through the auxiliary feed port 17 for the melting of fly ash.

[0033] Please see Figure 2 and Figure 3 As shown, both the first fixed housing 15 and the second fixed housing 24 have connecting plates 21 that are fixed to the ends of each set of arc generators 14. Both the first fixed housing 15 and the second fixed housing 24 have electric push rods 19 installed on their outer walls to push the connecting plates 21. One end of the connecting plate 21 that extends into the inner cavity of the first fixed housing 15 is fitted with a spring. The connecting plate 21 is pushed by the electric push rods 19, and the end of the connecting plate 21 located inside the first fixed housing 15 compresses the spring. The connecting plate 21 drives the arc generator 14 to move closer to the auxiliary feed port 17 on the furnace cover 5.

[0034] Please see Figure 1 and Figure 4As shown, water-cooling pipes 20 for cooling are arranged around the top edge of the furnace cover 5 and the outer surface of the furnace body 2. An exhaust port 11 is provided at the top end of the furnace cover 5, and a discharge port 3 for discharging material is provided on one side surface of the furnace body 2. The water-cooling pipes 20 ensure that the temperature of the refractory material on the periphery of the furnace body 2 is below 80°C. The molten slurry is cooled by contact with the refractory material through the temperature after melting and the water cooling temperature of the water-cooling pipes 20 to form a molten slurry-refractory eutectic protective layer, which can provide a certain degree of protection for the refractory material and prevent the refractory material from being consumed due to high temperature and corrosion, thereby extending the service life of the furnace body 2.

[0035] Please see Figure 1 As shown, four electric support rods 6 are installed on the bottom surface of the support base 1 to support the stability of the furnace body 2. The telescopic end of each electric support rod 6 is hinged to the bottom surface of the support base 1. Initially, the four electric support rods 6 are in a non-energized state to keep the furnace body 2 stable. By extending one of the electric support rods 6, the electric support rod 6 drives one side of the support base 1 to rise. Then the electric support rod 6 on the other side drives the other side of the support base 1 to rise. This process is repeated, causing the support furnace body 2 and the support arc generator 14 to deflect together. Through the reciprocating left and right lifting action design, the fly ash in the furnace body 2 melts more evenly and fully, improving the melting efficiency.

[0036] Please see Figure 1 As shown, a structural column 9 and a transformer 10 are provided on one side of the supporting base 1. Each set of arc generators 14 is connected to a water-cooled cable. The water-cooled cable is guided by the erection of the structural column 9 and connected to the transformer 10. The transformer 10 and the arc generator 14 are connected together through the water-cooled cable, so that the arc generator 14 generates a high-temperature arc.

[0037] In use, the conduits 4 connected to the three sets of arc generators 14 move under the action of the lifting and traversing assembly and pass through any three of the six auxiliary feed ports 17 to reach the furnace body 2. This avoids the three conduits 4 entering the furnace body 2 in close proximity, which would cause uneven melting of fly ash. The feeder is connected to the central feed port 16 and the remaining auxiliary feed ports 17. Through the electric valve at the bottom of the feed buffer bin and the metering screw conveyor of the feeder, materials are dropped simultaneously or intermittently at different positions to ensure uniform feeding and melting of materials, avoiding uneven melting and improving the melting efficiency of the arc generator 14. The high-temperature arc generated by the arc generator 14 is transferred to the conduit 4, which heats the fly ash in the furnace body 2 to a sufficient temperature, melting it into a liquid state.

[0038] The fixed sleeve 15 rotates together with the fixed sleeve 24 under the connection of the connecting column 26, changing the rotation angle of the fixed sleeve 15 and the fixed sleeve 24, so as to make it easy to align the conduit 4 connected to the arc generator 14 with the hole groove of the auxiliary feed port 17. The conduit 4 is easily inserted into the furnace body 2 through the auxiliary feed port 17 to melt the fly ash by sliding the sliding seat 28 up and down in the support column 7.

[0039] By extending the electric support rod 6, the electric support rod 6 drives one side of the bearing base 1 to rise, and then the electric support rod 6 on the other side drives the other side of the bearing base 1 to rise. This process is repeated, causing the supporting furnace body 2 and the supporting arc generator 14 to deflect together. Through the reciprocating left and right lifting action design, the fly ash in the furnace body 2 melts more evenly and fully, improving the melting efficiency.

[0040] The molten slurry is cooled by contact with the refractory material through the temperature after melting and the water cooling temperature of the water cooling pipe 20 to form a molten slurry-refractory eutectic protective layer, which can provide a certain degree of protection for the refractory material and prevent it from being consumed due to high temperature and corrosion, thereby extending the service life of the furnace body 2.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A melting furnace system for fly ash resource utilization, comprising a furnace body (2), wherein a bearing base (1) is provided on the bottom surface of the furnace body (2), and a furnace cover (5) is rotatably installed on the top surface of the furnace body (2), characterized in that: Three sets of electric arc generators (14) for melting fly ash inside the furnace body (2) are provided above the furnace cover (5). Each set of electric arc generators (14) is connected to a conduit (4) at its end. The top surface of the bearing base (1) and one side of the furnace body (2) are provided with a lifting and traversing assembly for controlling the simultaneous movement of the three sets of electric arc generators (14). The lifting and traversing assembly includes two support columns (7). A sliding seat (28) is slidably installed between the two support columns (7). The inner wall of the sliding seat (28) is provided with a bearing mechanism for supporting the three sets of electric arc generators (14). The top surface of the furnace cover (5) is provided with a central feed port (16) for the entry of fly ash raw materials. The top surface of the furnace cover (5) and outside the central feed port (16) are provided with nine auxiliary feed ports (17) for the auxiliary entry of fly ash raw materials and the vertical entry of the conduit (4). Six auxiliary feed ports (17) are arranged in a ring and located outside the central feed port (16). The other three auxiliary feed ports (17) are located outside the six auxiliary feed ports (17) arranged in a ring. Three of the six auxiliary feed ports (17) are used for the auxiliary entry of fly ash raw materials, and the other three auxiliary feed ports (17) are used for the end entry of the conduit (4). The supporting mechanism includes an upper lifting plate (8), a mounting plate (22), and a lower lifting plate (27) from top to bottom. The ends of the upper lifting plate (8), the mounting plate (22), and the lower lifting plate (27) are all fixed to the outer wall of the sliding seat (28). Multiple vertical plates (25) are installed between the lower lifting plate (27) and the upper lifting plate (8). Fixed housing one (15) and fixed housing two (24) for supporting and installing each group of arc generators (14) are rotatably installed on the surfaces of the mounting plate (22) and the lower lifting plate (27). A connecting column (26) is installed between the fixed housing one (15) and the fixed housing two (24). A through hole (23) for the connecting column (26) to pass through is provided on the surface of the mounting plate (22). Both the first fixed housing (15) and the second fixed housing (24) are equipped with connecting plates (21) that are fixed to the ends of each group of arc generators (14).

2. The melting furnace system for fly ash resource utilization according to claim 1, characterized in that, The end of the arc generator (14) is connected to a fixing block (13) for fixing the conduit (4), and the fixing block (13) has an arc-shaped structure.

3. The melting furnace system for fly ash resource utilization according to claim 1, characterized in that, Electric push rods (19) for pushing the connecting plate (21) are installed on the outer wall surfaces of both the first fixed housing (15) and the second fixed housing (24). A spring is fitted on one end of the connecting plate (21) that extends into the inner cavity of the first fixed housing (15).

4. A melting furnace system for fly ash resource utilization according to claim 1, characterized in that, Water cooling pipes (20) for cooling are arranged around the top edge of the furnace cover (5) and the outer surface of the furnace body (2). An exhaust port (11) is provided at the top end of the furnace cover (5). A discharge port (3) for discharging material is provided on one side surface of the furnace body (2).

5. A melting furnace system for fly ash resource utilization according to claim 1, characterized in that, Four electric support rods (6) for supporting the furnace body (2) are installed on the bottom surface of the bearing base (1). The telescopic end of each electric support rod (6) is hinged to the bottom surface of the bearing base (1).

6. A melting furnace system for fly ash resource utilization according to claim 1, characterized in that, Each set of arc generators (14) is connected to a water-cooled cable, which is guided by the structural column (9) and connected to the transformer (10).

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