An electric melting furnace for utilizing the waste heat of cigarettes

Abstract

The invention discloses an electric melting furnace for utilizing waste heat from smoke, comprising a furnace body, a side wall of the furnace body being provided with a feed pipe inclined upward, a material bin being provided at the upper end of the feed pipe, a smoke extraction hood being provided above the air outlet of the furnace body, the upper end of the smoke extraction hood being connected with an L-shaped pipe, the other end of the L-shaped pipe being provided with a first vertical pipe, the feed pipe being provided with a first intersection bin adapted to the first vertical pipe, the lower end of the first vertical pipe being provided with a horizontal connecting pipe, the other end of the horizontal connecting pipe being provided with a second vertical pipe, the feed pipe being provided with a second intersection bin, the second vertical pipe being provided with an exhaust device, the upper end of the second vertical pipe being connected with the outside, the high-temperature smoke generated during the electric melting process being contacted and heat-exchanged with the material to be melted in the feed pipe twice in a gradient manner, the waste heat of the smoke generated during the electric melting process being fully utilized, the initial temperature of the material to be melted entering the furnace being increased as much as possible, energy being saved, and the heat utilization rate being high.

Description

Technical Field

[0001] The present invention relates to the technical field of electric melting furnaces, and particularly to an electric melting furnace for utilizing the waste heat of flue gas. Background Art

[0002] An electric melting furnace is a metallurgical furnace that uses the electrothermal effect for heating, and is an electric furnace that uses the Joule heat generated by an electric current passing through a conductor. During the working process of the electric melting furnace, a large amount of heat and high-temperature flue gas are generated. If the high-temperature flue gas is directly discharged, it will not only affect the safety of operating personnel but also seriously pollute the environment. Therefore, it is necessary to recycle the waste heat of the heat and high-temperature flue gas during the production process of the electric melting furnace. Summary of the Invention

[0003] The purpose of the present invention is to provide an electric melting furnace for utilizing the waste heat of flue gas to solve the problem of recycling the waste heat of the heat and high-temperature flue gas during the production process of the electric melting furnace.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] An electric melting furnace for utilizing the waste heat of flue gas includes a furnace body. An inclined upward feeding pipe is provided on the side wall of the furnace body. A feed bin is provided at the upper end of the feeding pipe. A smoke suction hood is provided above the air outlet of the furnace body. The upper end of the smoke suction hood is connected to an L-shaped pipe. The other end of the L-shaped pipe is provided with a first vertical pipe. A first confluence bin adapted to the first vertical pipe is provided on the feeding pipe. The lower end of the first vertical pipe is located below the first confluence bin and is provided with a horizontal connecting pipe. The other end of the horizontal connecting pipe is provided with a second vertical pipe. A second confluence bin adapted to the second vertical pipe is also provided on the feeding pipe, and the distance from the second confluence bin to the feed bin is less than the distance from the first confluence bin to the feed bin. A gas extraction device is provided below the second confluence bin on the second vertical pipe, and the upper end of the second vertical pipe is located above the second confluence bin and is communicated with the outside.

[0006] A further technical solution is that both the first confluence bin and the second confluence bin include a rectangular confluence bin. The size of the rectangular confluence bin is larger than that of the feeding pipe. Connecting ports with gradually decreasing diameters are provided at both the left and right ends of the rectangular confluence bin. The inner diameter of the connecting port at the end far from the rectangular confluence bin is the same as the inner diameter of the feeding pipe.

[0007] A further technical solution is that a filter plate is provided in the rectangular confluence bin, and the filter plate is located on the extension line of the lower side wall of the feeding pipe.

[0008] A further technical solution is that a flue gas sedimentation device is provided on the horizontal connecting pipe.

[0009] A further technical solution is: the smoke settling device includes a settling box, the lower end of the settling box is provided with two conical buckets, the connecting part of the two conical buckets protrudes upward, and the first air guide plate, the second air guide plate and the third air guide plate are sequentially provided in the settling box along the direction of air flow movement.

[0010] A further technical solution is: the second air guide plate is fixedly installed on the connecting part, the first air guide plate and the third air guide plate are symmetrically arranged on both sides of the second air guide plate, the air flow moving direction of the first air guide plate is inclined downward, and the second air guide plate and the third air guide plate are both vertically arranged.

[0011] A further technical solution is: a slag discharge pipe is connected to the lower end of the conical bucket, and a slag collecting box is provided below the slag discharge pipe.

[0012] A further technical solution is: a horizontal buffer tube is provided at the lower end of the feed tube, and the other end of the horizontal buffer tube is connected to the feed port on the side wall of the furnace body.

[0013] The present invention has the following advantages: under the action of the exhaust device, the high-temperature flue gas generated in the electric melting process first enters the first intersection bin close to the furnace body through the pipeline to exchange heat with the material to be melted at a higher temperature, and the medium-temperature flue gas after the temperature is reduced enters the second intersection bin away from the furnace body through the pipeline to exchange heat with the material to be melted at a lower temperature. The heat exchange with the material to be melted is carried out twice in a gradient manner, and the waste heat of the flue gas in the electric melting process is fully utilized, the initial temperature of the material to be melted entering the furnace is increased as much as possible, energy is saved, and the heat utilization rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the top view structure of the rectangular intersection warehouse.

[0016] In the figure, 1-furnace body, 2-feed pipe, 3-silo, 4-smoke hood, 5-L-shaped pipe, 6-first vertical pipe, 7-first intersection bin, 8-horizontal connecting pipe, 9-second vertical pipe, 10-second intersection bin, 11-exhaust device, 12-rectangular intersection bin, 13-connecting port, 14-filter plate, 15-sedimentation box, 16-conical bucket, 17-first air guide plate, 18-second air guide plate, 19-third air guide plate, 20-slag discharge pipe, 21-slag collecting box, 22-horizontal buffer pipe. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0019] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention 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 should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Referring to Figure 1 , Figure 2 as shown, one embodiment of the present invention is:

[0024] A waste heat utilization electric melting furnace for cigarettes, comprising a furnace body 1, wherein a feed pipe 2 inclined upward is provided on the side wall of the furnace body 1, a silo 3 is provided at the upper end of the feed pipe 2, a smoking hood 4 is provided above the air outlet of the furnace body 1, an L-shaped pipe 5 is connected to the upper end of the smoking hood 4, a first vertical pipe 6 is provided at the other end of the L-shaped pipe 5, a first confluence bin 7 adapted to the first vertical pipe 6 is provided on the feed pipe 2, the lower end of the first vertical pipe 6 is located below the first confluence bin 7 and is provided with a horizontal connecting pipe 8, a second vertical pipe 9 is provided at the other end of the horizontal connecting pipe 8, a second confluence bin 10 adapted to the second vertical pipe 9 is further provided on the feed pipe 2, and the distance from the second confluence bin 10 to the silo 3 is less than the distance from the first confluence bin 7 to the silo 3. A gas extraction device 11 is provided below the second confluence bin 10 on the second vertical pipe 9, and the upper end of the second vertical pipe 9 is located above the second confluence bin 10 and is communicated with the outside.

[0025] The gas extraction device 11 is an existing device, and those skilled in the art can select and install the corresponding gas extraction equipment on the market according to actual needs. The specific structure of the gas extraction device 11 will not be elaborated here.

[0026] Under the action of the gas extraction device 11, the high-temperature flue gas generated during the electric melting process first enters the first confluence bin 7 close to the furnace body 1 to exchange heat with the material to be melted at a relatively high temperature. The medium-temperature flue gas after the temperature is reduced then enters the second confluence bin 9 far from the furnace body 1 through the pipeline to exchange heat with the material to be melted at a low temperature. By adopting two gradients of heat exchange with the material to be melted, the waste heat of the flue gas during the electric melting process is fully utilized, and the initial temperature of the material to be melted entering the furnace is increased as much as possible, saving energy and having a high heat utilization rate.

[0027] Further, both the first confluence bin 7 and the second confluence bin 10 include a rectangular confluence bin 12, the size of the rectangular confluence bin 12 is larger than that of the feed pipe 2, and connecting ports 13 with gradually decreasing diameters are provided at both the left and right ends of the rectangular confluence bin 12. The inner diameter of the end of the connecting port 13 far from the rectangular confluence bin 12 is the same as the inner diameter of the feed pipe 2.

[0028] The confluence bin adopts a rectangular structure with a size larger than that of the feed pipe 2, so that the air flow velocity slows down when the flue gas enters the confluence bin, and at the same time, it is beneficial to make the material to be melted more dispersed in the confluence bin, so that the material to be melted can fully contact and exchange heat with the flue gas in the confluence bin, improving the heat utilization rate.

[0029] Further, as Figure 1 shown, a filter plate 14 is provided in the rectangular confluence bin 12, and the filter plate 14 is located on the extension line of the lower side wall of the feed pipe 2.

[0030] The set filter plate can effectively prevent some materials from entering the vertical pipe, ensuring the long-term stable operation of the equipment. The connection between the filter plate 14 and the feed pipe 2 is smoothly processed to ensure the smooth entry and exit of materials.

[0031] Furthermore, a flue gas sedimentation device is provided on the horizontal connecting pipe.

[0032] The flue gas sedimentation device includes a sedimentation tank 15. Two conical hoppers 16 are provided at the lower end of the sedimentation tank 15. The connecting part of the two conical hoppers 16 bulges upward. A first air guiding plate 17, a second air guiding plate 18 and a third air guiding plate 19 are sequentially arranged in the sedimentation tank 16 along the air flow moving direction.

[0033] The second air guiding plate 18 is fixedly installed on the connecting part. The first air guiding plate 19 and the third air guiding plate 19 are symmetrically arranged on both sides of the second air guiding plate 18. The first air guiding plate 17 is inclined downward in the air flow moving direction. The second air guiding plate and the third air guiding plate are both vertically arranged.

[0034] A slag discharge pipe 20 is connected to the lower end of the conical hopper 16. A slag collection box 21 is provided below the slag discharge pipe 20.

[0035] Adopting two conical hoppers 16 at the lower end of the sedimentation tank 15 and cooperating with three groups of air guiding plates can effectively filter and collect the dust particles in the high-temperature smoke, and collect and recycle them through the slag collection box 21.

[0036] The first air guiding plate 17 is inclined downward in the air flow moving direction to prevent some dust particles from being counterattacked into the horizontal pipe when the air guiding plate 17 faces the air flow directly. After the moving speed of the dust particles is reduced, the second air guiding plate and the third air guiding plate which are vertically arranged in the rear section can effectively block the dust particles, effectively reducing the dust amount in the discharged flue gas and having a higher dust collection rate.

[0037] Furthermore, a horizontal buffer pipe 22 is provided at the lower end of the feed pipe 2. The other end of the horizontal buffer pipe 22 is communicated with the side wall feed port of the furnace body 1.

[0038] The provided horizontal buffer pipe 22 buffers the molten materials to be fed into the furnace, avoiding the situation that the initial speed of the molten materials to be fed into the furnace is too high and causing the molten liquid to splash, and ensuring the safe operation of the equipment.

[0039] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric melting furnace for utilizing the waste heat of cigarettes, comprising a furnace body (1), characterized in that: The side wall of the furnace body (1) is provided with an upwardly inclined feed pipe (2), the upper end of the feed pipe (2) is provided with a storage bin (3), a smoke suction hood (4) is arranged above the air outlet of the furnace body (1), the upper end of the smoke suction hood (4) is connected with an L-shaped pipe (5), the other end of the L-shaped pipe (5) is provided with a first vertical pipe (6), a first confluence bin (7) adapted to the first vertical pipe (6) is arranged on the feed pipe (2), the lower end of the first vertical pipe (6) is located below the first confluence bin (7) and is provided with a horizontal connecting pipe (8), the other end of the horizontal connecting pipe (8) is provided with a second vertical pipe (9), a second confluence bin adapted to the second vertical pipe (9) is also arranged on the feed pipe (2), and the distance from the second confluence bin to the storage bin (3) is less than the distance from the first confluence bin (7) to the storage bin (3). A suction device (11) is arranged below the second confluence bin on the second vertical pipe (9), and the upper end of the second vertical pipe (9) is located above the second confluence bin (10) and is communicated with the outside; Both the first confluence bin (7) and the second confluence bin (10) include a rectangular confluence bin (12), the size of the rectangular confluence bin (12) is larger than that of the feed pipe (2), connecting ports (13) with gradually decreasing diameters are arranged at both the left and right ends of the rectangular confluence bin (12), and the inner diameter of the end of the connecting port (13) far from the rectangular confluence bin (12) is the same as the inner diameter of the feed pipe (2); A flue gas sedimentation device is arranged on the horizontal connecting pipe (8); The flue gas sedimentation device includes a sedimentation tank (15), two conical hoppers (16) are arranged at the lower end of the sedimentation tank (15), the connecting part of the two conical hoppers (16) bulges upward, and a first air guide plate (17), a second air guide plate (18) and a third air guide plate (19) are sequentially arranged in the sedimentation tank (15) along the air flow moving direction.

2. The electric melting furnace for utilizing the waste heat of cigarettes according to claim 1, wherein: A filter plate (14) is arranged in the rectangular confluence bin (12), and the filter plate (14) is located on the extension line of the lower side wall of the feed pipe (2).

3. A kind of electric melting furnace for utilizing cigarette waste heat according to claim 1, characterized in that: The second air guide plate (18) is fixedly installed on the connecting part, the first air guide plate (17) and the third air guide plate (19) are symmetrically arranged on both sides of the second air guide plate (18), the first air guide plate (17) is arranged to incline downward in the air flow moving direction, and both the second air guide plate (18) and the third air guide plate (19) are arranged vertically.

4. A waste heat utilization electric furnace for cigarettes according to claim 1, characterized in that: The lower end of the conical hopper (16) is connected with a slag discharge pipe (20), and a slag collection box (21) is arranged below the slag discharge pipe (20).

5. The electric melting furnace for utilizing the waste heat of cigarettes according to claim 1, wherein: The lower end of the feed pipe (2) is provided with a horizontal buffer pipe (22), and the other end of the horizontal buffer pipe (22) is communicated with the side wall feed port of the furnace body (1).

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