Intelligent waste heat recovery and utilization device for an electric arc furnace

Abstract

The utility model relates to a waste heat recycling technical field especially relates to a mineral heat furnace intelligence waste heat recovery and utilization device, including mounting bracket, the inner wall fixed mounting of mounting bracket has the recovery cylinder, the top fixed connection of recovery cylinder has the shot -blasting box, the inner wall fixed connection of recovery cylinder has the primary screw heat exchanger, the one end intercommunication of primary screw heat exchanger has the communicating pipe, the one end intercommunication of communicating pipe away from primary screw heat exchanger has the secondary screw heat exchanger, the bottom fixed connection of recovery cylinder has the hopper, the bottom intercommunication of hopper has the shot -blasting box, the outer surface intercommunication of shot -blasting box has the shot -blasting pipe, through the equipment setting primary screw heat exchanger and secondary screw heat exchanger and high temperature flue gas carry out heat exchange and heat the cooling water after production and life use, the spiral structure design of primary screw heat exchanger and secondary screw heat exchanger, satisfy the cooling water heating while making dust enrichment on its surface, thereby facilitating the subsequent dust cleaning work.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery and utilization technology, and in particular to an intelligent waste heat recovery and utilization device for a submerged arc furnace. Background Technology

[0002] A submerged arc furnace, also known as an electric arc furnace or resistance furnace, is an industrial device that uses electrical energy to generate high temperatures and smelt metals or chemical raw materials through a reduction reaction. Its core principle is to generate an electric arc through electrodes and use the resistance heat of the current passing through the furnace charge to melt raw materials such as ores, carbonaceous reducing agents, and solvents, thereby realizing the reduction and refining of metals or the production of chemical products.

[0003] The working principle of the intelligent waste heat recovery device for electric arc furnaces is to recover and convert the heat in the high-temperature flue gas emitted by the electric arc furnace through heat exchange technology. When the high-temperature flue gas passes through the heat exchanger, the heat is transferred to the circulating water or other media through the metal pipe wall. Some systems utilize the phase change principle to improve the heat absorption efficiency. The recovered heat energy can be directly used to generate steam to drive the steam turbine generator set to generate electricity, or its grade can be improved through heat pump technology for heating, preheating raw materials, etc.

[0004] Currently, intelligent waste heat recovery devices for ferroelectric furnaces can heat circulating water using heat exchangers to process the high-temperature flue gas emitted from the ferroelectric furnace. However, during waste heat recovery, dust remains in the waste heat recovery device. After prolonged operation, a thick layer of dust accumulates inside the waste heat recovery device, which significantly reduces the device's waste heat recovery efficiency. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides an intelligent waste heat recovery and utilization device for ferroelectric furnaces, which solves the technical problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an intelligent waste heat recovery and utilization device for a submerged arc furnace, including a mounting frame, a recovery cylinder fixedly installed on the inner wall of the mounting frame, a shot blasting box fixedly connected to the top of the recovery cylinder, a primary spiral heat exchanger fixedly connected to the inner wall of the recovery cylinder, a connecting pipe connected to one end of the primary spiral heat exchanger, a secondary spiral heat exchanger connected to the end of the connecting pipe away from the primary spiral heat exchanger, a feeding hopper fixedly connected to the bottom of the recovery cylinder, a shot unloading box connected to the bottom of the feeding hopper, a shot unloading pipe connected to the outer surface of the shot unloading box, and a separation box fixedly connected to the end of the shot unloading pipe away from the shot unloading box.

[0009] To solve the above technical problems, the present invention provides the following technical solution: a steel shot storage box is fixedly connected to the top of the shot blasting box, a feed hopper is fixedly connected to the top of the steel shot storage box, and an air inlet regulating component is fixedly installed on the outer surface of the recovery cylinder.

[0010] To solve the above-mentioned technical problems, the present invention provides the following technical solution: the outer surface of the recovery cylinder is connected to a water inlet pipe, and the water inlet pipe is connected to the end of the first-stage spiral heat exchanger away from the connecting pipe.

[0011] To solve the above-mentioned technical problems, the present invention provides the following technical solution: the outer surface of the recovery cylinder is connected to a water outlet pipe, and the water outlet pipe is connected to the end of the secondary spiral heat exchanger away from the connecting pipe.

[0012] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an air inlet pipe is connected to the outer surface of the recovery cylinder, an air outlet pipe is connected to the outer surface of the recovery cylinder, and a number of U-shaped fasteners are fixedly connected to the inner wall of the recovery cylinder.

[0013] To solve the above technical problems, the present invention provides the following technical solution: a drive motor is fixedly installed on the outer surface of the shot unloading box, a rotating shaft is fixedly connected to the output end of the drive motor, and a shot unloading plate is fixedly connected to the outer wall of the rotating shaft.

[0014] To solve the above technical problems, the present invention provides the following technical solution: a screen is fixedly connected to the inner wall of the separation box, a collection box is slidably connected to the inner wall of the separation box, a shot discharge groove is opened through the outer surface of the separation box, and a shot collection box is slidably connected to the outer wall of the shot discharge groove.

[0015] The beneficial effects of this utility model are:

[0016] 1. The equipment uses a primary spiral heat exchanger and a secondary spiral heat exchanger to exchange heat with high-temperature flue gas, heating the cooling water for production and daily use. The spiral structure design of the primary and secondary spiral heat exchangers allows dust to accumulate on their surfaces while heating the cooling water, thus facilitating subsequent dust cleaning.

[0017] 2. The servo motor in the equipment drives the impeller in the shot blasting box to rotate, scattering the steel shot in the steel shot storage box into the recovery cylinder. The steel shot collides with the surfaces of the primary and secondary spiral heat exchangers. This impact can effectively remove the dust deposited on the surfaces of the primary and secondary spiral heat exchangers, ensuring the waste heat recovery efficiency of the device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of the recycling cylinder of this utility model.

[0021] Figure 3 This is a schematic diagram of the internal structure of the recycling cylinder of this utility model.

[0022] Figure 4 This is a schematic diagram of the internal structure of the separation box of this utility model.

[0023] Figure 5 This is a schematic diagram of the internal structure of the shot unloading box of this utility model.

[0024] In the diagram: 1. Mounting frame; 2. Recovery cylinder; 3. Rotating shaft; 4. Steel shot storage box; 5. Feed hopper; 6. Water outlet pipe; 7. Water inlet pipe; 8. Shot unloading box; 9. Separation box; 10. Shot blasting box; 11. Feed hopper; 12. Air outlet pipe; 13. Secondary spiral heat exchanger; 14. Connecting pipe; 15. Primary spiral heat exchanger; 16. Air inlet pipe; 17. Screen; 18. Collection box; 19. Shot collection box; 20. Shot discharge trough; 21. Shot discharge pipe; 22. Shot unloading plate. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Example 1

[0027] Reference Figure 1-5 This is the first embodiment of the present invention, which provides an intelligent waste heat recovery and utilization device for a submerged arc furnace, including a mounting frame 1. A recovery cylinder 2 is fixedly installed on the inner wall of the mounting frame 1. A shot blasting box 10 is fixedly connected to the top of the recovery cylinder 2. A primary spiral heat exchanger 15 is fixedly connected to the inner wall of the recovery cylinder 2. One end of the primary spiral heat exchanger 15 is connected to a connecting pipe 14. The end of the connecting pipe 14 away from the primary spiral heat exchanger 15 is connected to a secondary spiral heat exchanger 13. A feeding hopper 11 is fixedly connected to the bottom of the recovery cylinder 2. A shot unloading box 8 is connected to the bottom of the feeding hopper 11. A shot unloading pipe 21 is connected to the outer surface of the shot unloading box 8. A separation box 9 is fixedly connected to the end of the shot unloading pipe 21 away from the shot unloading box 8.

[0028] The primary spiral heat exchanger 15 and the secondary spiral heat exchanger 13 have a spiral structure. The spiral structure creates local eddies and areas of reduced flow velocity. This design causes dust in the flue gas to detach from the main airflow due to inertia and gradually settle on the surfaces of the primary spiral heat exchanger 15 and the secondary spiral heat exchanger 13. The spiral tube winding structure prolongs the flue gas flow path, increases the contact time between dust and the heat exchanger wall, and the temperature drop of the high-temperature flue gas causes dust condensation, thus promoting dust accumulation on the surfaces of the primary spiral heat exchanger 15 and the secondary spiral heat exchanger 13. The primary spiral heat exchanger 15 is made of 310S stainless steel, and the secondary spiral heat exchanger 13 is made of 316L stainless steel. The steel shot is made of high-carbon alloy steel with a wear-resistant coating. The surfaces of the primary spiral heat exchanger 15 and the secondary spiral heat exchanger 13 are coated with a wear-resistant ceramic coating with a thickness of ≥0.1mm to prevent wear on the surfaces of both surfaces that may be caused by the impact of steel shot.

[0029] An impeller is rotatably installed inside the shot blasting box 10. A servo motor for driving the impeller rotation is fixedly installed on the outer surface of the shot blasting box 10. A steel shot storage box 4 is fixedly connected to the top of the shot blasting box 10. A feed hopper 5 is fixedly connected to the top of the steel shot storage box 4. An air inlet regulating component is fixedly installed on the outer surface of the recovery cylinder 2. The air inlet regulating component includes a controller, a fan, and a pressure sensor. The controller uses a PID algorithm to dynamically adjust the fan speed to maintain the pressure inside the recovery cylinder 2 within the range of -50 to 0 Pa. The controller is installed on the outer surface of the recovery cylinder 2. A square groove is opened through the outer surface of the recovery cylinder 2. The fan is installed in the square groove. The pressure sensor is installed in the exhaust pipe 12. The pressure sensor is used to monitor the flow pressure of the flue gas in the exhaust pipe 12 and feed it back to the controller. The controller controls the fan to adjust the power to maintain the pressure balance inside the recovery cylinder 2.

[0030] Example 2

[0031] Reference Figure 1-5 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: the outer surface of the recovery cylinder 2 is connected to a water inlet pipe 7, which is connected to the end of the first-stage spiral heat exchanger 15 away from the connecting pipe 14; the outer surface of the recovery cylinder 2 is connected to a water outlet pipe 6, which is connected to the end of the second-stage spiral heat exchanger 13 away from the connecting pipe 14; the outer surface of the recovery cylinder 2 is connected to an air inlet pipe 16; and the outer surface of the recovery cylinder 2 is connected to an air outlet pipe 12.

[0032] The inner wall of the recovery cylinder 2 is fixedly connected with several U-shaped fasteners. The U-shaped fasteners are used to assist in fixing the first-stage spiral heat exchanger 15 and the second-stage spiral heat exchanger 13. The outer surface of the shot discharge box 8 is fixedly installed with a drive motor. The output end of the drive motor is fixedly connected with a rotating shaft 3. The outer wall of the rotating shaft 3 is fixedly connected with a shot discharge plate 22. The inner wall of the separation box 9 is fixedly connected with a screen 17. The screen aperture is 1.2 times the diameter of the steel shot. The inner wall of the separation box is inclined at an angle of 30°. The inner wall of the separation box 9 is slidably connected with a collection box 18. The outer surface of the separation box 9 is provided with a shot discharge groove 20. The outer wall of the shot discharge groove 20 is slidably connected with a shot collection box 19.

[0033] The remaining structure is the same as that in Example 1.

[0034] During use, when recovering and utilizing the waste heat of flue gas in the electric arc furnace, the inlet pipe 16 is connected to the flue gas outlet pipe of the electric arc furnace, and the water inlet pipe 7 is connected to the external water pipe. Thus, cooling water enters from the water inlet pipe 7 and flows into the first-stage spiral heat exchanger 15, then flows into the second-stage spiral heat exchanger 13 through the connecting pipe 14, and finally flows out from the outlet pipe 6. After the high-temperature flue gas enters the recovery cylinder 2, it flows from bottom to top under the blowing of the fan and passes through the first-stage spiral heat exchanger 15 and the second-stage spiral heat exchanger 13. The high-temperature flue gas exchanges heat with the first-stage spiral heat exchanger 15 and the second-stage spiral heat exchanger 13. The first-stage spiral heat exchanger 15 and the second-stage spiral heat exchanger 13 absorb the heat from the high-temperature flue gas and heat the cooling water flowing inside the first-stage spiral heat exchanger 15 and the second-stage spiral heat exchanger 13. After being heated, the cooling water flows out from the outlet pipe 6 and can be used for production and domestic purposes. At the same time, the cooled flue gas is discharged through the outlet pipe 12.

[0035] During operation, as the high-temperature flue gas flows upward through the primary spiral heat exchanger 15 and the secondary spiral heat exchanger 13, its temperature gradually decreases, causing dust to easily accumulate on the surfaces of these two heat exchangers. The pitch of the spiral heat exchangers 15 and 13 is 1.5-2 times the pipe diameter to balance heat exchange efficiency and dust accumulation. The servo motor is activated to drive the impeller inside the shot blasting box 10, scattering the steel shot from the steel shot storage box 4 into the recovery cylinder. Inside the 2nd chamber, steel shot collides with the surfaces of the primary spiral heat exchanger 15 and the secondary spiral heat exchanger 13. The impact effectively removes the dust deposited on the surfaces of the primary spiral heat exchanger 15 and the secondary spiral heat exchanger 13. The steel shot and dust fall into the unloading box 8 below. The drive motor is started to rotate the rotating shaft 3, which in turn rotates the unloading plate 22, sending the steel shot and dust into the collection box 18. After being separated by the screen 17, the dust falls into the collection box 18, and the steel shot rolls down the discharge trough 20 into the receiving box 19.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A smart waste heat recovery and utilization device for a submerged arc furnace, characterized in that: The system includes a mounting frame (1), on the inner wall of which a recovery cylinder (2) is fixedly mounted. A shot blasting box (10) is fixedly connected to the top of the recovery cylinder (2). A primary spiral heat exchanger (15) is fixedly connected to the inner wall of the recovery cylinder (2). One end of the primary spiral heat exchanger (15) is connected to a connecting pipe (14). The end of the connecting pipe (14) away from the primary spiral heat exchanger (15) is connected to a secondary spiral heat exchanger (13). A discharge hopper (11) is fixedly connected to the bottom of the recovery cylinder (2). The bottom of the discharge hopper (11) is connected to a shot unloading box (8). A shot discharge pipe (21) is connected to the outer surface of the shot unloading box (8). A separation box (9) is fixedly connected to the end of the shot discharge pipe (21) away from the shot unloading box (8).

2. The intelligent waste heat recovery and utilization device for a submerged arc furnace according to claim 1, characterized in that: The top of the shot blasting box (10) is fixedly connected to a steel shot storage box (4), the top of the steel shot storage box (4) is fixedly connected to a feed hopper (5), and the outer surface of the recovery cylinder (2) is fixedly installed with an air inlet regulating component.

3. The intelligent waste heat recovery and utilization device for a submerged arc furnace according to claim 1, characterized in that: The outer surface of the recovery cylinder (2) is connected to a water inlet pipe (7), which is connected to the end of the first-stage spiral heat exchanger (15) away from the connecting pipe (14).

4. The intelligent waste heat recovery and utilization device for a submerged arc furnace according to claim 1, characterized in that: The outer surface of the recovery cylinder (2) is connected to a water outlet pipe (6), which is connected to the end of the secondary spiral heat exchanger (13) away from the connecting pipe (14).

5. The intelligent waste heat recovery and utilization device for a submerged arc furnace according to claim 1, characterized in that: The outer surface of the recovery cylinder (2) is connected to an air inlet pipe (16), the outer surface of the recovery cylinder (2) is connected to an air outlet pipe (12), and the inner wall of the recovery cylinder (2) is fixedly connected to several U-shaped fasteners.

6. The intelligent waste heat recovery and utilization device for a submerged arc furnace according to claim 1, characterized in that: A drive motor is fixedly installed on the outer surface of the shot unloading box (8), and a rotating shaft (3) is fixedly connected to the output end of the drive motor. A shot unloading plate (22) is fixedly connected to the outer wall of the rotating shaft (3).

7. The intelligent waste heat recovery and utilization device for a submerged arc furnace according to claim 1, characterized in that: The inner wall of the separation box (9) is fixedly connected to a screen (17), and the inner wall of the separation box (9) is slidably connected to a collection box (18). The outer surface of the separation box (9) is provided with a shot discharge groove (20), and the outer wall of the shot discharge groove (20) is slidably connected to a shot collection box (19).

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