Electric furnace dust exhaust device with low-energy-consumption circulating air duct design

Abstract

The utility model relates to the technical field of electric furnace dust exhaust, in particular to a low-energy-consumption circulating air duct design electric furnace dust exhaust device which comprises an electric furnace body, a dust exhaust air duct, a circulating air duct, a heat exchanger, a dust remover, a fan and a controller. The top of the electric furnace body is provided with a dust discharge port connected with a dust remover through a dust discharge air duct, the dust remover is connected with a heat exchanger through a first circulating air duct, and the heat exchanger returns to an air inlet of the electric furnace body (1) through a second circulating air duct. The dust exhaust air duct comprises a main air duct and an auxiliary air duct, and a first valve is arranged on the auxiliary air duct. Guide vanes and heat insulation layers are arranged in the first circulating air duct and the second circulating air duct, heat exchange pipes arranged in a snake shape and corrugated fins are arranged in the heat exchanger, and a filter bag and a back flushing device are arranged in the dust remover. The fan comprises a motor and a multi-blade impeller. According to the device, by optimizing the air duct design, smoke waste heat recovery and partial smoke recycling are achieved, energy consumption is effectively reduced, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of industrial dust removal technology, specifically a low-energy-consumption circulating air duct design for electric furnace dust removal device. Background Technology

[0002] With the continuous development of electric furnace dust removal technology, electric furnace dust removal devices have been widely used in industrial production. However, existing electric furnace dust removal devices still have some problems in practical use, especially in terms of energy consumption and the design of circulating air ducts. Existing dust removal devices usually adopt a single air duct design, resulting in low dust removal efficiency and high energy consumption, making it difficult to meet the energy conservation and emission reduction requirements of modern industry.

[0003] A search revealed a method for flue gas dust removal in steelmaking electric furnaces, published on March 2, 2016, with publication number CN104006672B. This technical solution uses a high-temperature gas dust removal and purification device and a heat exchanger to remove dust and recover waste heat from the flue gas. While it achieves a certain dust removal effect, its duct design is relatively simple and fails to fully utilize the advantages of a circulating air duct, resulting in high energy consumption. Furthermore, this solution relies on an external fan to drive the flue gas flow, increasing the system's energy consumption and operating costs.

[0004] A search revealed an environmentally friendly flue gas dust removal device for a medium-frequency induction furnace, published on February 9, 2024, with publication number CN116929092B. This technical solution uses a blower and dust collector to capture and discharge flue gas, achieving some environmental protection benefits. However, its duct design lacks a recycling mechanism, resulting in high energy consumption during dust removal. Furthermore, the solution does not effectively recover waste heat from the flue gas, further increasing energy waste.

[0005] The aforementioned problems indicate that existing electric furnace dust removal devices have significant shortcomings in terms of duct design and energy consumption control, making it difficult to meet the demands of modern industry for efficient and low-energy dust removal devices. Therefore, this invention provides an electric furnace dust removal device with a low-energy circulating duct design to overcome these shortcomings and provide a more energy-efficient and effective dust removal solution. Utility Model Content

[0006] A low-energy-consumption circulating air duct design for electric furnace dust removal includes an electric furnace body, a dust removal air duct, a circulating air duct, a heat exchanger, a dust collector, a fan, and a controller. The top of the electric furnace body is provided with a dust removal port, which is connected to the dust collector through the dust removal air duct. The dust collector is connected to the heat exchanger through a first circulating air duct, and the heat exchanger is connected to the air inlet of the electric furnace body through a second circulating air duct. The fan is located on the first circulating air duct, and the controller is electrically connected to both the fan and the heat exchanger.

[0007] The dust exhaust duct includes a main duct and a secondary duct. One end of the main duct is connected to the dust exhaust port, and the other end is connected to the dust collector. One end of the secondary duct is connected to the middle of the main duct, and the other end is connected to the air inlet of the electric furnace body. A first valve is installed on the secondary duct, and the first valve is electrically connected to the controller. Both the main duct and the secondary duct are equipped with guide plates arranged in a spiral shape, and the spiral direction of the guide plates is opposite to the airflow direction to reduce airflow resistance and improve airflow uniformity.

[0008] Both the first and second circulating air ducts are equipped with multiple guide vanes arranged at an angle of 15° to 30° to guide airflow in a predetermined direction, reducing turbulence and resistance. The inner walls of both the first and second circulating air ducts are provided with a heat insulation layer made of multi-layer glass fiber and ceramic fiber composite material to reduce heat loss.

[0009] The heat exchanger includes a shell, multiple heat exchange tubes, and multiple fins. The shell contains multiple heat exchange tubes arranged in a serpentine pattern, and the outer wall of each tube is provided with multiple corrugated fins to increase the heat exchange area. Both ends of each heat exchange tube are connected to a first circulating air duct and a second circulating air duct, respectively. A cooling medium, either water or cooling oil, is disposed inside each heat exchange tube and circulates within the tube via an external circulating pump.

[0010] The dust collector includes a housing, multiple filter bags, and a back-flushing device. The housing contains multiple cylindrical filter bags with micropores on their outer walls to capture dust particles. The back-flushing device includes a back-flushing pipe and a back-flushing fan. The back-flushing pipe is positioned above the filter bags and has multiple back-flushing nozzles, each corresponding to a filter bag. The back-flushing fan is mounted on the back-flushing pipe and electrically connected to a controller. The back-flushing fan injects high-pressure gas into the filter bags through the back-flushing pipe to remove dust particles from the surface of the filter bags.

[0011] The fan is installed on the first circulating air duct. The fan includes a motor and an impeller. The motor is electrically connected to the controller. The impeller is mounted on the output shaft of the motor and has a multi-bladed structure with blades tilted at an angle of 30° to 45° to improve airflow propulsion efficiency. Both the air inlet and outlet of the fan are equipped with filters made of stainless steel wire mesh to prevent large particles from entering the fan.

[0012] The controller includes a microprocessor, a power supply module, an input module, and an output module. The microprocessor is electrically connected to the power supply module, the input module, and the output module. The input module includes a temperature sensor and a pressure sensor. The temperature sensor is located at the inlet and outlet of the heat exchanger, and the pressure sensor is located on the dust exhaust duct and the circulating duct. The output module includes a fan and a backflow fan. The controller acquires temperature and pressure data through the input module and controls the operating status of the fan and the backflow fan through the output module.

[0013] The structure and operating principle of this invention are as follows: Smoke and dust generated by the electric furnace body enter the main air duct through the dust discharge port. A guide plate within the main air duct guides the smoke and dust to flow in a predetermined direction, reducing airflow resistance. Part of the smoke and dust returns directly to the air inlet of the electric furnace body through the secondary air duct, achieving partial recycling. The remaining smoke and dust enters the dust collector through the main air duct. Filter bags within the dust collector capture smoke and dust particles, and a backflushing device periodically removes the dust particles from the surface of the filter bags. The dust after dust removal enters the heat exchanger through the first circulating air duct. Heat exchange tubes and fins within the heat exchanger transfer the heat from the smoke and dust to the cooling medium. The cooling medium circulates within the heat exchange tubes driven by an external circulating pump, achieving waste heat recovery. The cooled smoke and dust returns to the air inlet of the electric furnace body through the second circulating air duct, achieving further recycling. A fan is installed on the first circulating air duct, driving airflow through an impeller, reducing the need for an external fan and lowering energy consumption. The controller monitors the system's operating status in real time through temperature and pressure sensors, and achieves automatic control of the system by controlling the operation of the fan and back-blowing fan.

[0014] The beneficial effects of this utility model are:

[0015] 1. By designing the main and secondary air ducts, some of the smoke and dust can be directly recycled, reducing the use of external fans and lowering energy consumption.

[0016] 2. Through the design of the heat exchanger, the waste heat of flue gas is recovered and utilized, further reducing energy consumption and improving energy utilization efficiency.

[0017] 3. The design of the guide vanes and guide plates reduces airflow resistance, improves airflow uniformity and propulsion efficiency, and further reduces energy consumption. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the dust exhaust duct structure;

[0020] Figure 3 This is a schematic diagram of the heat exchanger.

[0021] Figure 4 This is a schematic diagram of the dust collector.

[0022] Figure 5 This is a schematic diagram of the fan structure;

[0023] Figure 6 This is a schematic diagram of the controller's structure;

[0024] In the diagram: 1. Electric furnace body; 2. Dust outlet; 3. Dust exhaust duct; 31. Main duct; 32. Secondary duct; 33. First valve; 34. Guide plate; 4. Dust collector; 41. Shell; 42. Filter bag; 43. Backflush device; 431. Backflush pipe; 432. Backflush blower; 433. Backflush nozzle; 5. First circulating duct; 51. Guide vane; 52. Insulation layer; 6. Heat exchanger; 62. Heat exchange tube; 63. Fin; 64. Cooling medium; 7. Second circulating duct; 8. Fan; 81. Motor; 82. Impeller; 83. Filter screen; 9. Controller; 91. Microprocessor; 92. Power module; 93. Input module; 931. Temperature sensor; 932. Pressure sensor; 94. Output module. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] See Figures 1 to 6 A low-energy-consumption circulating air duct design for electric furnace dust removal includes an electric furnace body 1, a dust removal air duct 3, a circulating air duct, a heat exchanger 6, a dust collector 4, a fan 8, and a controller 9. The top of the electric furnace body 1 is provided with a dust discharge port 2, which is connected to the dust collector 4 through the dust removal air duct 3. The dust collector 4 is connected to the heat exchanger 6 through a first circulating air duct 5. The heat exchanger 6 is connected to the air inlet of the electric furnace body 1 through a second circulating air duct 7. The fan 8 is located on the first circulating air duct 5. The controller 9 is electrically connected to both the fan 8 and the heat exchanger 6.

[0027] The dust exhaust duct 3 includes a main duct 31 and a secondary duct 32. One end of the main duct 31 is connected to the dust exhaust port 2, and the other end is connected to the dust collector 4. One end of the secondary duct 32 is connected to the middle of the main duct 31, and the other end is connected to the air inlet of the electric furnace body 1. A first valve 33 is provided on the secondary duct 32, and the first valve 33 is electrically connected to the controller 9. Both the main duct 31 and the secondary duct 32 are equipped with guide plates 34. The guide plates 34 are arranged in a spiral shape, and the spiral direction of the guide plates 34 is opposite to the airflow direction to reduce airflow resistance and improve airflow uniformity.

[0028] Both the first circulating air duct 5 and the second circulating air duct 7 are equipped with multiple guide vanes 51. The guide vanes 51 are arranged at an angle of 15° to 30° to guide the airflow in a predetermined direction and reduce airflow turbulence and resistance. The inner walls of both the first circulating air duct 5 and the second circulating air duct 7 are equipped with a heat insulation layer 52, which is made of multi-layer glass fiber and ceramic fiber composite material to reduce heat loss.

[0029] The heat exchanger 6 includes a shell 41, multiple heat exchange tubes 62, and multiple fins 63. The shell 41 contains multiple heat exchange tubes 62 arranged in a serpentine pattern, and the outer wall of each heat exchange tube 62 is provided with multiple fins 63 arranged in a corrugated pattern to increase the heat exchange area. The two ends of each heat exchange tube 62 are connected to a first circulating air duct 5 and a second circulating air duct 7, respectively. A cooling medium 64, which is water or cooling oil, is disposed inside each heat exchange tube 62 and circulates within the heat exchange tube 62 driven by an external circulating pump.

[0030] The dust collector 4 includes a housing 41, multiple filter bags 42, and a back-blowing device 43. Multiple filter bags 42 are arranged cylindrically inside the housing 41, and their outer walls have multiple micropores to capture dust particles. The back-blowing device 43 includes a back-blowing pipe 431 and a back-blowing fan 432. The back-blowing pipe 431 is positioned above the filter bags 42 and has multiple back-blowing nozzles 433, each corresponding to a filter bag 42. The back-blowing fan 432 is mounted on the back-blowing pipe 431 and is electrically connected to a controller 9. The back-blowing fan 432 sprays high-pressure gas into the filter bags 42 through the back-blowing pipe 431 to remove dust particles from the surface of the filter bags 42.

[0031] The fan 8 is installed on the first circulating air duct 5. The fan 8 includes a motor 81 and an impeller 82. The motor 81 is electrically connected to the controller 9. The impeller 82 is located on the output shaft of the motor 81 and has a multi-blade structure with blades tilted at an angle of 30° to 45° to improve airflow propulsion efficiency. Both the air inlet and outlet of the fan 8 are equipped with filters 83 made of stainless steel wire mesh to prevent large particles from entering the fan 8.

[0032] The controller 9 includes a microprocessor 91, a power supply module 92, an input module 93, and an output module 94. The microprocessor 91 is electrically connected to the power supply module 92, the input module 93, and the output module 94. The input module 93 includes a temperature sensor 931 and a pressure sensor 932. The temperature sensor 931 is located at the inlet and outlet of the heat exchanger 6, and the pressure sensor 932 is located on the dust exhaust duct 3 and the circulating duct. The output module 94 includes a fan 8 and a backflow fan 432. The controller 9 acquires temperature and pressure data through the input module 93 and controls the operating status of the fan 8 and the backflow fan 432 through the output module 94.

[0033] The structure and operating principle of this utility model are as follows: The flue gas generated by the electric furnace body 1 enters the main air duct 31 through the dust discharge port 2. The guide plate 34 within the main air duct 31 guides the flue gas to flow in a predetermined direction, reducing airflow resistance. Part of the flue gas returns directly to the air inlet of the electric furnace body 1 through the secondary air duct 32, achieving partial flue gas recycling. The remaining flue gas enters the dust collector 4 through the main air duct 31. The filter bags 42 within the dust collector 4 capture the flue gas particles, and the back-blowing device 43 periodically removes the flue gas particles from the surface of the filter bags 42. The dust after dust removal enters the heat exchanger 6 through the first circulating air duct 5. The heat exchange tubes 62 and fins 63 within the heat exchanger 6 transfer the heat from the flue gas to the cooling medium 64. The cooling medium 64 circulates within the heat exchange tubes 62 driven by an external circulating pump, achieving waste heat recovery. The cooled flue gas returns to the air inlet of the electric furnace body 1 through the second circulating air duct 7, achieving flue gas recycling. The fan 8 is installed on the first circulating air duct 5, and drives the airflow through the impeller 82, reducing the use of external fans and lowering energy consumption. The controller 9 monitors the system's operating status in real time through the temperature sensor 931 and the pressure sensor 932, and realizes automatic control of the system by controlling the operating status of the fan 8 and the backflow fan 432.

[0034] The beneficial effects of this utility model are:

[0035] 1. Through the design of the main air duct 31 and the secondary air duct 32, some of the smoke and dust can be directly recycled, reducing the use of external fans and reducing energy consumption.

[0036] 2. Through the design of heat exchanger 6, the waste heat of flue gas is recovered and utilized, further reducing energy consumption and improving energy utilization efficiency.

[0037] 3. The design of the guide plate 34 and the guide vane 51 reduces airflow resistance, improves airflow uniformity and propulsion efficiency, and further reduces energy consumption.

[0038] 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 descriptions of the above embodiments and specifications 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 protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0039] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0040] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.

[0041] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A low-energy-consumption circulating air duct design for electric furnace dust removal, characterized in that, The system includes an electric furnace body (1), a dust exhaust duct (3), a circulating duct, a heat exchanger (6), a dust collector (4), a fan (8), and a controller (9). The top of the electric furnace body (1) is provided with a dust exhaust port (2). The dust exhaust port (2) is connected to the dust collector (4) through the dust exhaust duct (3). The dust collector (4) is connected to the heat exchanger (6) through the first circulating duct (5). The heat exchanger (6) is connected to the air inlet of the electric furnace body (1) through the second circulating duct (7). The fan (8) is located on the first circulating duct (5). The controller (9) is electrically connected to the fan (8) and the heat exchanger (6) respectively.

2. The low-energy-consumption circulating air duct design for electric furnace dust removal device according to claim 1, characterized in that, The dust exhaust duct (3) includes a main duct (31) and a secondary duct (32). One end of the main duct (31) is connected to the dust outlet (2) and the other end is connected to the dust collector (4). One end of the secondary duct (32) is connected to the middle of the main duct (31) and the other end is connected to the air inlet of the electric furnace body (1). A first valve (33) is provided on the secondary duct (32), and the first valve (33) is electrically connected to the controller (9).

3. The low-energy-consumption circulating air duct design for electric furnace dust removal device according to claim 2, characterized in that, Both the main air duct (31) and the secondary air duct (32) are equipped with guide plates (34), which are arranged in a spiral shape and the spiral direction of the guide plates (34) is opposite to the airflow direction.

4. The low-energy-consumption circulating air duct design for electric furnace dust removal device according to claim 1, characterized in that, The first circulating air duct (5) and the second circulating air duct (7) are each provided with a plurality of guide vanes (51), which are arranged at an angle of 15° to 30°.

5. The low-energy-consumption circulating air duct design for electric furnace dust removal device according to claim 4, characterized in that, The inner walls of the first circulating air duct (5) and the second circulating air duct (7) are provided with a heat insulation layer (52), which is made of multilayer glass fiber and ceramic fiber composite material.

6. The low-energy-consumption circulating air duct design for electric furnace dust removal device according to claim 1, characterized in that, The heat exchanger (6) includes a shell (41), a plurality of heat exchange tubes (62) and a plurality of fins (63). The shell (41) is provided with a plurality of heat exchange tubes (62), which are arranged in a serpentine manner. The outer wall of the heat exchange tubes (62) is provided with a plurality of fins (63), which are arranged in a corrugated manner.

7. The low-energy-consumption circulating air duct design for electric furnace dust removal device according to claim 6, characterized in that, The two ends of the heat exchange tube (62) are connected to the first circulating air duct (5) and the second circulating air duct (7) respectively. The heat exchange tube (62) is provided with a cooling medium (64), which is water or cooling oil. The cooling medium (64) is driven by an external circulating pump to circulate inside the heat exchange tube (62).

8. The low-energy-consumption circulating air duct design for electric furnace dust removal device according to claim 1, characterized in that, The dust collector (4) includes a housing (41), multiple filter bags (42) and a back-blowing device (43). Multiple filter bags (42) are provided inside the housing (41). The filter bags (42) are arranged in a cylindrical shape and the outer wall of the filter bags (42) is provided with multiple micropores. The back-blowing device (43) includes a back-blowing pipe (431) and a back-blowing fan (432). The back-blowing pipe (431) is located above the filter bags (42) and multiple back-blowing nozzles (433) are provided on the back-blowing pipe (431). The back-blowing nozzles (433) correspond one-to-one with the filter bags (42). The back-blowing fan (432) is located on the back-blowing pipe (431) and is electrically connected to the controller (9).

9. The low-energy-consumption circulating air duct design for electric furnace dust removal device according to claim 1, characterized in that, The fan (8) includes a motor (81) and an impeller (82). The motor (81) is electrically connected to the controller (9). The impeller (82) is located on the output shaft of the motor (81). The impeller (82) has a multi-blade structure, and the blades have an inclination angle of 30° to 45°. The air inlet and air outlet of the fan (8) are both equipped with filter screens (83), which are made of stainless steel wire mesh.

10. The low-energy-consumption circulating air duct design for electric furnace dust removal device according to claim 1, characterized in that, The controller (9) includes a microprocessor (91), a power module (92), an input module (93), and an output module (94). The microprocessor (91) is electrically connected to the power module (92), the input module (93), and the output module (94), respectively. The input module (93) includes a temperature sensor (931) and a pressure sensor (932). The temperature sensor (931) is located at the inlet and outlet of the heat exchanger (6), and the pressure sensor (932) is located on the dust exhaust duct (3) and the circulating duct. The output module (94) includes a fan (8) and a backflow fan (432).

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