Electromagnetic heating rotary kiln with heat recovery function

Abstract

The utility model discloses a heat recovery electromagnetic heating rotary kiln, which belongs to the technical field of electromagnetic heating rotary kilns and comprises an electromagnetic heating rotary kiln body, a heat recovery device is arranged on one side of the electromagnetic heating rotary kiln body, and a tubular screw conveyor penetrates through a preheating cylinder and is fixed with the inner wall of the preheating cylinder through a preset number of support structures; a heat exchange air duct is defined by the preheating cylinder and the tubular spiral conveyor. A dewatering port is formed in the bottom of the preheating cylinder, an elevation angle structure is arranged on the inner wall of a heat exchange air duct of the dewatering port located at the air inlet end, and a dewatering groove with height difference is defined by the elevation angle structure and the dewatering port. The tubular spiral conveyor has the advantages that materials in the tubular spiral conveyor are preheated, and the purpose of recycling heat energy is achieved; the dewatering tank is used for discharging condensed cooling water, and wind resistance is avoided.

Description

Technical fields:

[0001] This utility model belongs to the field of electromagnetic heating rotary kiln technology, and more specifically relates to an electromagnetic heating rotary kiln with heat recovery. Background technology:

[0002] Traditional rotary kilns primarily use coal or gas for heating, generating heat through pulverized coal combustion at the kiln head, which is then transferred to the material via flame radiation and hot gas convection. This method is not only energy-intensive but also produces large amounts of harmful gases during combustion, causing serious environmental pollution. In contrast, electromagnetic heating rotary kilns utilize the principle of electromagnetic induction heating. High-frequency current generates eddy currents in a metal conductor, directly converting electrical energy into heat energy to heat the material. This process eliminates the need for combustion, resulting in no harmful gas emissions and truly achieving clean production.

[0003] Because electromagnetic induction heating acts directly on the material, heat is not easily lost, greatly improving energy utilization. At the same time, electromagnetic heating enables rapid heating, typically reducing heating time by more than 50%, thus significantly improving production efficiency. In contrast, the heating efficiency of traditional rotary kilns is affected by various factors such as combustion efficiency and heat transfer efficiency, making it difficult to achieve the high levels of electromagnetic heating in rotary kilns.

[0004] With its advantages of high efficiency, energy saving and environmental protection, electromagnetic heating rotary kiln replaces the traditional rotary kiln which is high in energy consumption and pollution. It achieves clean production through electromagnetic induction heating, improves energy utilization and production efficiency, reduces maintenance costs, and leads the green revolution in industrial production.

[0005] Although electromagnetic heating rotary kilns do not generate exhaust gas like traditional rotary kilns which mainly use coal or gas for heating, electromagnetic heating produces a large amount of hot steam at the material discharge port. This hot steam contains material particles and water vapor, and if discharged externally, it will not only cause environmental pollution but also result in a loss of thermal energy. Utility model content:

[0006] To solve the above problems and overcome the shortcomings of the existing technology, this utility model provides a heat recovery electromagnetic heating rotary kiln;

[0007] The first technical problem to be solved is that the material outlet will generate a large amount of hot steam after electromagnetic heating. The hot steam also contains material particles and water vapor. If it is discharged, it will not only cause environmental pollution but also result in the loss of heat energy.

[0008] The second technical problem to be solved is that during heat recovery, the condensed water and materials after heat exchange create wind resistance, resulting in poor heat exchange efficiency.

[0009] The specific technical solution of this utility model to solve the above-mentioned technical problems is as follows: a heat-recovery electromagnetic heating rotary kiln, including an electromagnetic heating rotary kiln body, a heat recovery device is provided on one side of the electromagnetic heating rotary kiln body, and the discharge port of the heat recovery device is connected to the preheating material inlet of the electromagnetic heating rotary kiln body through a multi-stage auger; the heat recovery device includes a raw material inlet, a tubular screw conveyor and a preheating cylinder; the tubular screw conveyor passes through the preheating cylinder and is fixed to the inner wall of the preheating cylinder through a preset number of support structures; the preheating cylinder and the tubular screw conveyor form a heat exchange duct;

[0010] The air outlet of the electromagnetic heating rotary kiln body is connected to the air inlet of the preheating cylinder through an air duct. The air inlet of the preheating cylinder is set along the tangential direction of the inner wall of the heat exchange air duct.

[0011] The bottom of the preheating cylinder is provided with a dehydration port, and the inner wall of the heat exchange air duct of the dehydration port located at the air inlet end is provided with an upward angle structure. The upward angle structure and the dehydration port form a dehydration tank with a height difference.

[0012] Furthermore, the support structure connects the inner wall of the preheating cylinder and the outer wall of the tubular screw conveyor.

[0013] Furthermore, the supporting structure is a supporting column.

[0014] Furthermore, the support structure is a spiral guide vane, which is spirally arranged inside the heat exchange duct.

[0015] Furthermore, the preheating cylinder is welded together from two semicircular arcs with different radii. The two semicircles with different radii are welded together at one end and have a dewatering port at the other end. The two semicircular arcs with different radii and the dewatering port form a dewatering trough with a height difference.

[0016] Furthermore, a water collection tank is provided at the bottom of the dehydration tank, and the water collection tank is connected to the outside through a drain pipe.

[0017] The beneficial effects of this utility model are:

[0018] One advantage of this utility model is that it provides an electromagnetic heating rotary kiln with a heat recovery device to preheat the material in the tubular screw conveyor, thereby achieving the purpose of heat energy recovery and utilization.

[0019] One advantage of this invention is that it provides a dehydration tank for discharging condensed cooling water, thus avoiding wind resistance.

[0020] One advantage of this invention is that the upward-angled structure, combined with the two sides of the dehydration tank, creates a pressure difference in the airflow, which achieves the separation of condensed water vapor and particulate matter from the hot air and avoids the generation of wind resistance. Attached image description:

[0021] AppendixFigure 1 This is a schematic diagram of the main view structure of this utility model;

[0022] Appendix Figure 2 This is a side view structural schematic diagram of the present invention;

[0023] Appendix Figure 3 This is a schematic diagram of the internal structure of the preheating cylinder according to the first embodiment of this utility model;

[0024] Appendix Figure 4 This is a schematic diagram of the internal structure of the preheating cylinder according to the second embodiment of this utility model; in the attached drawing:

[0025] 1. Preheated material inlet; 2. Electromagnetically heated rotary kiln body; 3. Multi-stage auger; 4. Air outlet; 5. Air inlet; 6. Preheating cylinder; 7. Exhaust gas outlet; 8. Tubular screw conveyor; 9. Raw material inlet; 10. Water collection tank; 11. Heat exchange air duct; 12. Support column; 13. Angle structure; 14. Dewatering tank; 15. Drain pipe. Detailed implementation method:

[0026] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "rear," "lower left," "upper right," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] The specific embodiment of this utility model is as follows: The electromagnetic heating rotary kiln with heat recovery includes an electromagnetic heating rotary kiln body 2. A heat recovery device is provided on one side of the electromagnetic heating rotary kiln body 2. The outlet of the heat recovery device is connected to the preheating material inlet 1 of the electromagnetic heating rotary kiln body 2 through a multi-stage auger 3. The heat recovery device includes a raw material inlet 9, a tubular screw conveyor 8, and a preheating cylinder 6. The tubular screw conveyor 8 passes through the preheating cylinder 6 and is fixed to the inner wall of the preheating cylinder 6 by a preset number of support structures. The preheating cylinder 6 and the tubular screw conveyor 8 form a heat exchange duct 11.

[0028] The air outlet 4 of the electromagnetic heating rotary kiln body 2 is connected to the air inlet 5 of the preheating cylinder 6 through the air duct. The air inlet 5 of the preheating cylinder 6 is set along the tangential direction of the inner wall of the heat exchange air duct 11.

[0029] The preheating cylinder 6 has a dehydration port at its bottom. The inner wall of the heat exchange duct 11 of the dehydration port at the air inlet end is provided with an upward-angled structure 13. The upward-angled structure 13 and the dehydration port form a dehydration trough 14 with a height difference. The support structure connects the inner wall of the preheating cylinder 6 and the outer wall of the tubular screw conveyor 8.

[0030] In the first embodiment of this utility model, the support structure is a support column 12; the support column 12 is only used to connect and fix the inner wall of the preheating cylinder 6 and the outer wall of the tubular screw conveyor 8.

[0031] As a second embodiment of this utility model, the supporting structure is a spiral guide vane, which is spirally arranged in the heat exchange duct 11; it is not only used to connect and fix the inner wall of the preheating cylinder 6 and the outer wall of the tubular screw conveyor 8; it can also play a role in increasing heat exchange through swirling flow.

[0032] As a preferred embodiment of this utility model, the dehydration tank 14 can preferably be formed by welding two semicircular arcs with different radii to the preheating cylinder 6. The two semicircles with different radii are welded together at one end and have a dehydration port at the other end. The two semicircular arcs with different radii and the dehydration port form a dehydration tank 14 with a height difference. A water collection tank 10 is provided at the bottom of the dehydration tank 14, and the water collection tank 10 is connected to the outside through a drain pipe 15.

[0033] It should be noted that this utility model is a heat recovery electromagnetic heating rotary kiln. In specific operation...

[0034] 1. The material enters through the raw material inlet 9 and is fed into the preheating cylinder 6 under the action of the tubular screw conveyor 8. Heat exchange takes place in the heat exchange duct 11 formed by the preheating cylinder 6 and the tubular screw conveyor 8. The hot air from the air outlet 4 of the electromagnetic heating rotary kiln body 2 is connected to the air inlet 5 of the preheating cylinder 6 through the duct. The air inlet 5 of the preheating cylinder 6 is tangential to the inner wall of the heat exchange duct 11. In this way, the hot air enters the heat exchange duct 11 in a swirling state, heating the outer wall of the tubular screw conveyor 8, thereby preheating the material inside the tubular screw conveyor 8 and realizing the purpose of heat energy recovery and utilization.

[0035] 2. At the same time, since the hot steam also contains material particles and water vapor, the condensate and material after the hot air condenses will generate wind resistance, resulting in poor heat exchange efficiency; this utility model also provides a dehydration tank 14 to discharge the condensed cooling water and avoid the generation of wind resistance.

[0036] 3. In particular: The angled structure 13 and the dehydration port form a dehydration tank 14 with a height difference. This creates a pressure difference in the airflow on both sides of the dehydration tank 14. The swirling airflow presses against the water flowing back along the inner wall of the heat exchange duct 11, impacting and swirling it. Under the action of gravity, centrifugal force and air pressure, the water is discharged from the dehydration tank 14 along a certain trajectory and collected in the water collection tank 10. It is then connected to the outside through the drain pipe 15, realizing the separation of condensed water vapor and particulate matter from the hot air and avoiding the generation of wind resistance.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A heat-recovery electromagnetically heated rotary kiln, comprising an electromagnetically heated rotary kiln body (2), wherein a heat recovery device is provided on one side of the electromagnetically heated rotary kiln body (2), and the outlet of the heat recovery device is connected to the preheated material inlet (1) of the electromagnetically heated rotary kiln body (2) via a multi-stage auger (3); characterized in that: The heat recovery device includes a raw material inlet (9), a tubular screw conveyor (8), and a preheating cylinder (6); the tubular screw conveyor (8) passes through the preheating cylinder (6) and is fixed to the inner wall of the preheating cylinder (6) by a preset number of support structures; the preheating cylinder (6) and the tubular screw conveyor (8) form a heat exchange duct (11); The air outlet (4) of the electromagnetic heating rotary kiln body (2) is connected to the air inlet (5) of the preheating cylinder (6) through the air duct. The air inlet (5) of the preheating cylinder (6) is set along the tangential direction of the inner wall of the heat exchange air duct (11). The bottom of the preheating cylinder (6) is provided with a dehydration port, and the inner wall of the heat exchange air duct (11) of the dehydration port located at the air inlet end is provided with an upward angle structure (13). The upward angle structure (13) and the dehydration port form a dehydration trough (14) with a height difference.

2. The electromagnetically heated rotary kiln with heat recovery according to claim 1, characterized in that... The support structure connects the inner wall of the preheating cylinder (6) and the outer wall of the tubular screw conveyor (8).

3. The electromagnetically heated rotary kiln with heat recovery according to claim 2, characterized in that... The supporting structure is a support column (12).

4. The electromagnetically heated rotary kiln with heat recovery according to claim 2, characterized in that... The supporting structure is a spiral guide vane, which is spirally arranged in the air duct between the inner wall of the preheating cylinder (6) and the outer wall of the tubular screw conveyor (8).

5. The electromagnetically heated rotary kiln with heat recovery according to claim 1, characterized in that... The preheating cylinder (6) is welded together from two semicircular arcs with different radii. The two semicircles with different radii are welded together at one end and have a dewatering port at the other end. The two semicircular arcs with different radii and the dewatering port form a dewatering tank (14) with a height difference.

6. The electromagnetically heated rotary kiln with heat recovery according to claim 1, characterized in that... The bottom of the dehydration tank (14) is provided with a water collection tank (10), which is connected to the outside through a drain pipe (15).

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