Electric furnace steelmaking secondary waste heat recycling device

Abstract

The utility model provides an electric furnace steelmaking secondary waste heat recycling device, and relates to the technical field of electric furnace steelmaking waste heat recycling. A secondary waste heat recycling device for electric furnace steelmaking comprises a heat exchange tank, a spiral heat exchange pipe for conducting heat exchange on flue gas is fixedly connected to the interior of the heat exchange tank, a dust removal box is fixedly connected to one end of the heat exchange tank, and a filter screen cylinder for filtering the flue gas is arranged in the dust removal box; and one end of the filter screen cylinder fixedly communicates with a communicating pipe. Through the arranged wind wheel, the wind wheel is driven to rotate when flue gas is discharged into the dust removal box, a reciprocating mechanism on the wind wheel drives an annular block to horizontally move in a reciprocating mode, a brush on the annular block is used for cleaning the surface of a filter screen cylinder, dust is prevented from blocking normal filtration of the filter screen cylinder, the labor amount of manual cleaning is reduced, and the dust removal efficiency is improved. And external driving equipment is not needed, so that the use cost is reduced.

Description

Technical Field

[0001] The utility model relates to a waste heat recovery device, in particular to a secondary waste heat recovery and utilization device for electric furnace steelmaking, belonging to the technical field of waste heat recovery and utilization for electric furnace steelmaking. Background Art

[0002] Electric furnace steelmaking mainly utilizes arc heat. In the arc action zone, the temperature is as high as 4000℃. The smelting process is generally divided into melting period, oxidation period and reduction period. Not only can an oxidizing atmosphere be created in the furnace, but also a reducing atmosphere. Therefore, the efficiency of dephosphorization and desulfurization is very high. The high-temperature furnace gas generated in the steelmaking process contains a large amount of flue gas and dust. If the high-temperature furnace gas is directly discharged into the atmosphere, it will pollute the atmosphere. The heat in the flue gas is recovered and reused through recovery equipment.

[0003] Chinese patent announcement No. CN215893369U discloses an exhaust gas waste heat recovery device, including a filter box, one side of the filter box is fixedly installed with an air intake pipe, the other side is provided with a waste heat recovery box, the same connecting pipe is fixedly installed between the waste heat recovery box and the filter box, two filter screens are fixedly installed in the filter box and a fixed block is fixedly installed on the bottom inner wall, a rotating groove is opened on the top of the fixed block, a screw guide sleeve is rotatably installed in the rotating groove, an elliptical wheel is fixedly sleeved on the screw guide sleeve and a screw is threadedly sleeved on the top, two mounting rods are fixedly installed on the inner wall of one side of the filter box, a movable hole is opened on one side of the two mounting rods, and cross bars are movably installed in the two movable holes.

[0004] However, the inventor of the above device believes that there are certain defects. The above device cleans the filter device by repeatedly pulling the pull rod manually, which increases the workload of the staff. If a motor-driven device is used for cleaning, the cost of use will increase. For this reason, the utility model provides a secondary waste heat recovery and utilization device for electric furnace steelmaking. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] The purpose of the utility model is to provide a secondary waste heat recovery and utilization device for electric furnace steelmaking in order to solve the above problems, so as to solve the problems in the prior art that manual cleaning increases the workload of staff and the use cost increases by using a motor drive.

[0007] (II) Technical solution

[0008] The utility model is realized through the following technical scheme: a device for recovering and utilizing secondary waste heat from electric furnace steelmaking, comprising a heat exchange tank, the interior of which is fixedly connected with a spiral heat exchange tube for heat exchange of flue gas, one end of the heat exchange tank is fixedly connected with a dust box, the interior of the dust box is provided with a filter cylinder for filtering flue gas, one end of the filter cylinder is fixedly connected with a connecting pipe, one end of the connecting pipe extends to the interior of the heat exchange tank and is connected with an air inlet end of the spiral heat exchange tube, an inner top wall of the dust box is rotatably connected with a wind wheel, an annular block is sleeved on the outer surface of the filter cylinder, a brush for cleaning the outer surface of the filter cylinder is fixedly connected to the inner wall of the annular block, a reciprocating mechanism for driving the annular block to move back and forth left and right is provided on the bottom of the wind wheel, an air inlet pipe arranged corresponding to the wind wheel is fixedly connected to the dust box, and the other end of the heat exchange tank is fixedly connected with an air outlet pipe connected with the exhaust end of the spiral heat exchange tube.

[0009] Preferably, the reciprocating mechanism includes a rotating rod fixed at the bottom of the wind wheel shaft, the bottom of the rotating rod is fixedly connected to an extrusion block, the inside of the dust removal box is fixedly connected to a fixed sliding rod, the fixed sliding rod is slidably connected to a sliding rod, a through groove is provided on the top of the sliding rod, the extrusion block slides inside the sliding rod, the annular block is fixed at the bottom of the sliding rod, and the reciprocating mechanism is used to drive the annular block to move back and forth left and right, so that the brush of the annular block cleans the filter cylinder.

[0010] Preferably, the bottom of the dust removal box is fixedly connected to a dust discharge port, and the bottom of the dust discharge port is detachably connected to a blocking cover, so that the dust inside the dust removal box can be easily discharged by opening the blocking cover at the bottom of the dust discharge port.

[0011] Preferably, the filter screen cylinder includes a left fixed plate, a filter screen and a right fixed plate, the filter screen is fixedly connected between the left fixed plate and the right fixed plate, and the connecting pipe is fixedly connected to one side of the right fixed plate. The left fixed plate, the filter screen and the right fixed plate are arranged to form a filter screen cylinder to filter dust in the smoke.

[0012] Preferably, the top and bottom of the heat exchange tank are respectively fixedly connected with a water injection pipe and a drainage pipe, and the water injection pipe and the drainage pipe are fixedly connected with an electric valve. Water is injected into the heat exchange tank through the water injection pipe, and the water after heat exchange is discharged by opening the drainage pipe.

[0013] Preferably, the other end of the heat exchange tank is fixedly connected to a controller, and the two electric valves are electrically connected to the controller. The two electric valves can be easily controlled by setting up the controller.

[0014] Preferably, a temperature sensor and a liquid level sensor are fixedly connected to the inner wall of the heat exchange tank, and both the temperature sensor and the liquid level sensor are electrically connected to the controller. The water temperature inside the heat exchange tank is detected by the set temperature sensor, and the liquid level state inside the heat exchange tank is detected by the set liquid level sensor.

[0015] The utility model provides a device for recovering and utilizing secondary waste heat from electric furnace steelmaking, which has the following beneficial effects:

[0016] 1. The device discharges the flue gas into the dust removal box through the air inlet pipe, filters the flue gas through the filter cylinder inside the dust removal box to filter out the dust in the flue gas, and then introduces the flue gas into the spiral heat exchange tube inside the heat exchange tank through the connecting pipe to exchange heat with the water inside the heat exchange tank to realize waste heat recovery. The wind wheel is driven to rotate when the flue gas is discharged into the dust removal box through the set wind wheel, and the reciprocating mechanism on the wind wheel drives the annular block to move reciprocatingly horizontally. The brush on the annular block is used to clean the surface of the filter cylinder to prevent dust from blocking the normal filtration of the filter cylinder, thereby reducing the labor of manual cleaning and reducing the use cost without the need for external drive equipment.

[0017] 2. The device injects water into the heat exchange tank through the water injection pipe, and detects the water temperature inside the heat exchange tank through the set temperature sensor. After the heat exchange is completed, the temperature sensor transmits a signal to the controller, and the controller controls the electric valve on the drain pipe to open to discharge the water. The liquid level state inside the heat exchange tank is detected through the set liquid level sensor. When the liquid level inside the heat exchange tank is low, the signal is transmitted to the controller, and the controller controls the electric valve on the drain pipe to close, and controls the electric valve on the water injection pipe to open to refill water, thereby achieving the effect of automatic water change. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall three-dimensional diagram of the utility model;

[0019] Figure 2 This is a three-dimensional diagram of the dust removal box of the utility model;

[0020] Figure 3 It is a cutaway perspective view of the heat exchange tank of the utility model;

[0021] Figure 4 This is a schematic diagram of the dust removal box structure of the utility model;

[0022] Figure 5 It is a three-dimensional diagram of the reciprocating mechanism structure of the utility model;

[0023] Figure 6 It is a cross-sectional view of the sliding rod of the utility model.

[0024]

Main component symbol description

[0025] 1. Heat exchange tank; 11. Water injection pipe; 12. Drain pipe; 2. Spiral heat exchange tube; 3. Dust removal box; 31. Air inlet pipe; 32. Dust outlet; 4. Filter cylinder; 41. Left fixed plate; 42. Filter; 43. Right fixed plate; 5. Connecting pipe; 6. Wind wheel; 61. Ring block; 62. Fixed slide rod; 63. Slide rod; 64. Rotating rod; 65. Extrusion block; 7. Temperature sensor; 8. Liquid level sensor; 9. Controller; 10. Exhaust pipe. DETAILED DESCRIPTION

[0026] The embodiment of the utility model provides a device for recovering and utilizing secondary waste heat from electric furnace steelmaking.

[0027] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , a device for recovering and utilizing secondary waste heat from electric furnace steelmaking, comprises a heat exchange tank 1, the interior of which is fixedly connected with a spiral heat exchange tube 2 for heat exchange of flue gas, one end of which is fixedly connected with a dust removal box 3, the interior of which is provided with a filter screen cylinder 4 for filtering flue gas, the flue gas entering the dust removal box 3 is filtered through the outer surface of the filter screen cylinder 4 to filter out dust in the flue gas, the flue gas enters the interior of the filter screen cylinder 4, one end of the filter screen cylinder 4 is fixedly connected with a connecting pipe 5, one end of the connecting pipe 5 extends to the interior of the heat exchange tank 1 and is connected to the air inlet end of the spiral heat exchange tube 2, the other end of the heat exchange tank 1 is fixedly connected with an outlet pipe 10 connected to the exhaust end of the spiral heat exchange tube 2, the filtered flue gas flows into the interior of the spiral heat exchange tube 2 through the connecting pipe 5, exchanges heat with the water inside the heat exchange tank 1, and is finally discharged through the outlet pipe 10 at one end of the heat exchange tank 1.

[0028] Please refer again Figure 4 The filter screen cylinder 4 includes a left fixed plate 41, a filter screen 42 and a right fixed plate 43. The filter screen 42 is fixedly connected between the left fixed plate 41 and the right fixed plate 43. The connecting pipe 5 is fixedly connected to one side of the right fixed plate 43. The filter screen cylinder 4 is cylindrical, and the smoke is filtered through the filter screen 42.

[0029] Please refer again Figure 4 , Figure 5 and Figure 6The inner top wall of the dust removal box 3 is rotatably connected with a wind wheel 6, and the dust removal box 3 is fixedly connected with an air intake pipe 31 arranged corresponding to the wind wheel 6. The smoke is filled into the dust removal box 3 through the air intake pipe 31, and the smoke filled into the dust removal box 3 drives the wind wheel 6 to rotate. The outer surface of the filter screen cylinder 4 is sleeved with an annular block 61, and the inner wall of the annular block 61 is fixedly connected with a brush for cleaning the outer surface of the filter screen cylinder 4. A reciprocating mechanism for driving the annular block 61 to move back and forth left and right is provided at the bottom of the wind wheel 6. The annular block 61 is driven by the reciprocating mechanism to move horizontally, and the outer surface of the filter screen cylinder 4 is cleaned by the brush.

[0030] Please refer again Figure 4 , Figure 5 and Figure 6 The reciprocating mechanism includes a rotating rod 64 fixed to the bottom of the wind wheel 6 shaft, and a squeezing block 65 is fixedly connected to the bottom of the rotating rod 64. The dust removal box 3 is fixedly connected to a fixed slide bar 62, and a sliding rod 63 is slidably connected to the fixed slide bar 62. A through groove is provided on the top of the sliding rod 63, and the squeezing block 65 slides inside the sliding rod 63. The annular block 61 is fixed to the bottom of the sliding rod 63. When the wind wheel 6 rotates, the rotating rod 64 is driven to rotate horizontally, and the squeezing block 65 arranged at one end of the rotating rod 64 is used to squeeze the slide groove at the top of the sliding rod 63, driving the sliding rod 63 to slide horizontally left and right on the fixed slide bar 62. The bottom of the dust removal box 3 is fixedly connected to a dust discharge port 32, and the bottom of the dust discharge port 32 is detachably connected to a blocking cover. The dust cleaned up can be discharged from the inside of the dust removal box 3 by opening the blocking cover at the bottom of the dust discharge port 32.

[0031] Please refer again Figure 1 , Figure 2 and Figure 3 The top and bottom of the heat exchange tank 1 are respectively fixedly connected with a water injection pipe 11 and a drainage pipe 12, and the water injection pipe 11 and the drainage pipe 12 are fixedly connected with electric valves. Water is injected into the heat exchange tank 1 through the water injection pipe 11, and the water after heat exchange is discharged by opening the drainage pipe 12. The other end of the heat exchange tank 1 is fixedly connected with a controller 9, and the two electric valves are electrically connected to the controller 9. The controller 9 is set to facilitate real-time control of the two electric valves. The inner wall of the heat exchange tank 1 is fixedly connected with a temperature sensor 7 and a liquid level sensor 8, and the temperature sensor 7 and the liquid level sensor 8 are electrically connected to the controller 9. The water temperature inside the heat exchange tank 1 is detected by the set temperature sensor 7, and the liquid level inside the heat exchange tank 1 is detected by the set liquid level sensor 8. According to the water temperature and the liquid level state, the two electric valves are controlled in real time under the action of the controller 9, thereby realizing the automatic water replacement process.

[0032] When in use: the wind wheel 6 refers to the wind turbine component that converts wind energy into mechanical energy, the temperature sensor 7 refers to a sensor that can sense temperature and convert it into a usable output signal, the liquid level sensor 8 is a pressure sensor that measures the liquid level, and the controller 9 is a PLC controller, which is a digital computing and operating electronic system specially designed for use in an industrial environment.

[0033] Working principle: install the device at a suitable position, inject water into the interior of the heat exchange tank 1, connect one end of the air inlet pipe 31 to the exhaust pipeline, connect one end of the air outlet pipe 10 to the purification equipment, and the high-temperature flue gas enters the interior of the dust removal box 3 through the air inlet pipe 31, and then passes through the filter cylinder 4 to filter the flue gas to filter out the dust in the flue gas. The high-temperature flue gas flows into the interior of the spiral heat exchange tube 2 through the connecting pipe 5, and exchanges heat with the water inside the heat exchange tank 1, and then is discharged through the air outlet pipe 10. The flue gas filled into the dust removal box 3 through the air inlet pipe 31 blows the wind wheel 6 to rotate, driving the rotating rod 64 to rotate horizontally, and the sliding groove on the top of the sliding rod 63 is squeezed by the squeezing block 65 set at one end of the rotating rod 64, driving the sliding rod 6 3 slides horizontally back and forth on the fixed slide bar 62, and cleans the outer surface of the filter screen cylinder 4 through the brush on the inner wall of the annular block 61 to prevent dust from blocking the filter screen cylinder 4. The water temperature inside the heat exchange tank 1 is detected by the set temperature sensor 7. When a certain temperature is reached, the temperature sensor 7 transmits a signal to the controller 9, and the controller 9 controls the electric valve on the drain pipe 12 to open to discharge the water. The liquid level state inside the heat exchange tank 1 is detected by the set liquid level sensor 8. When the liquid level inside the heat exchange tank 1 is low, the signal is transmitted to the controller 9, and the controller 9 controls the electric valve on the drain pipe 12 to close, and controls the electric valve on the water injection pipe 11 to open to refill water, thereby achieving the effect of automatic water replacement.

[0034] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A device for recovering and utilizing secondary waste heat from electric furnace steelmaking, comprising a heat exchange tank (1), characterized in that: The interior of the heat exchange tank (1) is fixedly connected with a spiral heat exchange tube (2) for heat exchange with flue gas; one end of the heat exchange tank (1) is fixedly connected with a dust removal box (3); the interior of the dust removal box (3) is provided with a filter screen cylinder (4) for filtering flue gas; one end of the filter screen cylinder (4) is fixedly connected with a connecting pipe (5); one end of the connecting pipe (5) extends into the interior of the heat exchange tank (1) and is connected with the air inlet end of the spiral heat exchange tube (2); the inner top wall of the dust removal box (3) is rotatably connected with a fan The outer surface of the filter screen cylinder (4) is sleeved with an annular block (61), the inner wall of the annular block (61) is fixedly connected with a brush for cleaning the outer surface of the filter screen cylinder (4), the bottom of the wind wheel (6) is provided with a reciprocating mechanism for driving the annular block (61) to move back and forth, the dust removal box (3) is fixedly connected with an air inlet pipe (31) arranged corresponding to the wind wheel (6), and the other end of the heat exchange tank (1) is fixedly connected with an air outlet pipe (10) connected with the exhaust end of the spiral heat exchange tube (2).

2. The electric furnace steelmaking secondary waste heat recovery and utilization device according to claim 1 is characterized in that: The reciprocating mechanism comprises a rotating rod (64) fixed at the bottom of the rotating shaft of the wind wheel (6); the bottom of the rotating rod (64) is fixedly connected to an extrusion block (65); the interior of the dust removal box (3) is fixedly connected to a fixed sliding rod (62); a sliding rod (63) is slidably connected to the fixed sliding rod (62); a through groove is provided at the top of the sliding rod (63); the extrusion block (65) slides inside the sliding rod (63); and the annular block (61) is fixed to the bottom of the sliding rod (63).

3. The electric furnace steelmaking secondary waste heat recovery and utilization device according to claim 1 is characterized in that: The bottom of the dust removal box (3) is fixedly connected to a dust discharge port (32), and the bottom of the dust discharge port (32) is detachably connected to a blocking cover.

4. The electric furnace steelmaking secondary waste heat recovery and utilization device according to claim 1 is characterized in that: The filter screen cylinder (4) comprises a left fixed plate (41), a filter screen (42) and a right fixed plate (43); the filter screen (42) is fixedly connected between the left fixed plate (41) and the right fixed plate (43); and the connecting pipe (5) is fixedly connected to a side surface of the right fixed plate (43).

5. The electric furnace steelmaking secondary waste heat recovery and utilization device according to claim 1 is characterized in that: The top and bottom of the heat exchange tank (1) are respectively fixedly connected with a water injection pipe (11) and a drainage pipe (12), and the water injection pipe (11) and the drainage pipe (12) are both fixedly connected with electric valves.

6. The electric furnace steelmaking secondary waste heat recovery and utilization device according to claim 5, characterized in that: The other end of the heat exchange tank (1) is fixedly connected to a controller (9), and the two electric valves are both electrically connected to the controller (9).

7. The electric furnace steelmaking secondary waste heat recovery and utilization device according to claim 6 is characterized in that: A temperature sensor (7) and a liquid level sensor (8) are fixedly connected to the inner wall of the heat exchange tank (1), and the temperature sensor (7) and the liquid level sensor (8) are both electrically connected to a controller (9).

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