Converter flue gas waste steel heating equipment

Abstract

The invention relates to the technical field of converter steelmaking, in particular to converter flue gas waste steel heating equipment which comprises a waste steel heating channel, the waste steel heating channel comprises a movable cover, a waste heat pipeline, a communicating pipeline and a heat preservation flue gas cover assembly which are communicated in sequence, and the communicating pipeline vertically communicates with the side wall of the front end of the heat preservation flue gas cover assembly; and the steel scrap conveying mechanism comprises a conveying mechanism, a discharging mechanism and a rail, and the discharging mechanism is arranged in the front end of the heat preservation smoke cover assembly. The communicating pipeline vertically communicates with the heat preservation smoke cover assembly, smoke can form rotational flow when the communicating pipeline enters the heat preservation smoke cover assembly, the residence time of the smoke in the waste steel heating channel is prolonged, the heat exchange efficiency of the smoke and waste steel is improved, and therefore waste heat recovery is improved. And meanwhile, the arrangement length of a waste heat pipeline can be shortened, the equipment investment cost is reduced, and double improvement of energy conservation, consumption reduction and economic benefits is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of converter steelmaking, and in particular to a converter flue gas scrap steel heating device. Background Art

[0002] Converter steelmaking uses molten iron, scrap steel, and ferroalloys as its primary raw materials. Steelmaking is accomplished in a converter, without the use of external energy sources, relying on the physical heat of the molten iron and the heat generated by chemical reactions between its components. Scrap steel costs are significantly lower than those of molten iron and ferroalloys. With the continued rise in blast furnace iron costs and environmental concerns, steel companies are generally facing insufficient iron supply, resulting in a situation where "steelmaking capacity exceeds ironmaking." Therefore, improving scrap steel utilization efficiency is key to addressing iron shortages and improving corporate economic returns. Developing smelting processes with high scrap steel ratios can effectively reduce production costs and enhance corporate competitiveness, making it a key development direction for the industry.

[0003] During the converter steelmaking process, scrap steel must be preheated. However, current scrap preheating technologies (such as tunnel kilns and oxy-fuel combustion) are ineffective, leading to relatively low scrap steel content and increased production costs. Summary of the Invention

[0004] The present invention provides a converter flue gas scrap steel heating device to solve the technical problems of poor preheating effect on scrap steel and low scrap steel ratio.

[0005] The present invention provides a converter flue gas scrap steel heating device, which comprises:

[0006] The scrap heating channel includes a movable cover, a residual heat pipe, a connecting pipe, and a heat-insulating fume hood assembly connected in sequence. The movable cover is used to communicate with the converter. The heat-insulating fume hood assembly is connected to a flue gas duct. The connecting pipe is vertically connected to the front side wall of the heat-insulating fume hood assembly. The residual heat pipe can move horizontally and vertically with the movable cover.

[0007] The scrap steel conveying mechanism includes a transport mechanism, a discharge mechanism and a track. The discharge mechanism is arranged in the front end of the thermal insulation fume hood assembly. The track is arranged in the thermal insulation fume hood assembly along the extension direction of the thermal insulation fume hood assembly. The transport mechanism is movably arranged on the track. The transport mechanism is used to transport scrap steel to the discharge mechanism. The discharge mechanism is used to add scrap steel into the converter.

[0008] In one embodiment of the present invention, the thermal insulation fume hood assembly includes an inclined thermal insulation fume hood and a horizontal thermal insulation fume hood connected in sequence from front to back, the front end height of the inclined thermal insulation fume hood is smaller than the rear end height thereof, and the connecting pipe, the inclined thermal insulation fume hood and / or the horizontal thermal insulation fume hood are provided with spiral guide plates extending along their respective axes.

[0009] In one embodiment of the present invention, the shape, pitch and / or inclination angle of the spiral guide plate are adjustable.

[0010] In one embodiment of the present invention, the rear end of the horizontal thermal insulation fume hood is connected to an anti-wind inlet passage, and the top height of the anti-wind inlet passage is smaller than the top height of the horizontal thermal insulation fume hood.

[0011] In one embodiment of the present invention, an automatic sealing fire wall, a cold air sealing wall and a scrap steel height control wall are sequentially arranged in the anti-air inlet channel from front to back. The automatic sealing fire wall, the cold air sealing wall and the scrap steel height control wall all extend downward from the top wall of the anti-air inlet channel and have a gap between them and the bottom wall of the anti-air inlet channel.

[0012] In one embodiment of the present invention, the automatic sealing fire wall is located at the front end opening of the wind inlet prevention channel.

[0013] In one embodiment of the present invention, the unloading mechanism includes a hopper and a unloading drive device that drives the hopper to pitch and tilt. The feed end and the discharge end of the hopper are respectively provided with a feed baffle and a discharge baffle. A discharge port that cooperates with the discharge baffle is correspondingly provided in the thermal insulation fume hood assembly, and the feed baffle and the discharge baffle are alternately opened and closed.

[0014] In one embodiment of the present invention, the smoke exhaust duct is vertically connected to the rear end outer wall of the thermal insulation smoke hood assembly.

[0015] In one embodiment of the present invention, the transport mechanism includes a charging trolley and a plurality of charging trolley driving members, and the plurality of charging trolley driving members are arranged on the track at intervals along an extension direction of the track.

[0016] In one embodiment of the present invention, a heat-insulating refractory material is laid in the residual heat pipe, or a water-cooling pipe is provided in the residual heat pipe.

[0017] Beneficial effects of the present invention: The present invention proposes a converter flue gas scrap steel heating device, which is connected to the converter through a movable hood, and introduces the converter flue gas into the thermal insulation flue gas hood assembly. In the process of transporting the scrap steel to the converter, it passes through the thermal insulation flue gas hood assembly, and the heat in the flue gas is used to preheat the scrap steel, thereby improving energy utilization efficiency and reducing production costs. After the flue gas preheats the scrap steel, the harmful substances in the flue gas (including flue gas that cannot be stored in the steel plant's gas storage cabinet and low-concentration carbon monoxide flue gas in the early and late stages of blowing) react with the scrap steel and are absorbed and utilized, which complies with the concept of green environmental protection and reduces the impact on the environment. The movable hood can move in the horizontal and vertical directions, can adapt to the position of the converter, and can be docked with the converter when the converter is in different positions, which facilitates the docking and use of this solution with the converter. The scrap steel conveying mechanism can transfer the scrap steel to the converter, which facilitates the transportation of the scrap steel. The transportation mechanism and the thermal insulation flue gas hood assembly cooperate to increase the contact time between the scrap steel and the converter flue gas, thereby improving the preheating efficiency of the scrap steel. The connecting pipe is connected vertically to the thermal insulation hood assembly, which can form a swirling flow when the flue gas enters the thermal insulation hood assembly from the connecting pipe. This increases the residence time of the flue gas in the thermal insulation hood assembly, improves the heat exchange efficiency between the flue gas and the scrap steel, and thus increases the scrap steel ratio. It also shortens the layout length of the residual heat pipe, reduces equipment investment costs, and achieves a dual improvement in energy conservation and consumption reduction and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0019] In the attached figure:

[0020] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0021] Figure 2 A top view provided in one embodiment of the present invention;

[0022] Figure 3 A top view provided in another embodiment of the present invention;

[0023] Figure 4 It is a velocity streamline diagram of an existing solution provided in one embodiment of the present invention;

[0024] Figure 5 This is a cloud diagram of scrap heating speed and temperature according to an existing solution provided in one embodiment of the present invention;

[0025] Figure 6This is a velocity streamline diagram provided in an embodiment of the present invention when no spiral guide plate is provided;

[0026] Figure 7 This is a cloud diagram of the speed and temperature of heated scrap steel when no spiral guide plate is provided in one embodiment of the present invention;

[0027] Figure 8 This is a velocity streamline diagram when a spiral guide plate is provided in one embodiment of the present invention;

[0028] Figure 9 This is a cloud diagram of the speed and temperature of heated scrap steel when a spiral guide plate is provided in one embodiment of the present invention.

[0029] The reference numerals are as follows:

[0030] 1-Converter; 21-Mobile hood; 22-Residual heat duct; 23-Insulated flue gas hood assembly; 23a-Tilted insulated flue gas hood; 23b-Horizontal insulated flue gas hood; 24-Connecting pipeline; 3-Exhaust duct; 4-Transport mechanism; 41-Track; 42-Charging car drive; 5-Air inlet prevention channel; 51-Automatic sealing fire wall; 52-Cold air sealing wall; 53-Scrap height control wall; 61-Hopper; 62-Unloading drive equipment; 63-Hydraulic cylinder support. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments. The details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. The following embodiments and features therein may be combined with one another without conflict.

[0032] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0033] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring the embodiments of the present invention.

[0034] It should be noted that the front end in this embodiment refers to the direction close to the converter 1, and the rear end refers to the direction away from the converter 1; the horizontal direction refers to the extension direction (length direction) of the thermal insulation flue gas hood assembly 23, and the vertical direction refers to the height direction of the thermal insulation flue gas hood assembly 23.

[0035] See Figure 1 , Figure 1 The converter 1 flue gas scrap heating device provided by one embodiment of the present invention is as follows: Figures 1 to 3 Shown, including:

[0036] The scrap steel heating channel includes a movable hood 21, a residual heat pipe 22, a connecting pipe 24 and an insulated fume hood assembly 23 which are connected in sequence from front to back. The movable hood 21 is used to be connected to the smoke outlet of the converter 1. The insulated fume hood assembly 23 is connected to the exhaust duct 3. The connecting pipe 24 is vertically connected to the front end side wall of the insulated fume hood assembly 23. The residual heat pipe 22 can move in the horizontal and vertical directions with the movable hood 21.

[0037] The scrap steel conveying mechanism includes a transport mechanism 4, a unloading mechanism and a track 41. The unloading mechanism is arranged at the front end of the thermal insulation fume hood assembly 23. The track 41 is arranged in the thermal insulation fume hood assembly 23 along the extension direction of the thermal insulation fume hood assembly 23. The transport mechanism 4 is movably arranged on the track 41. The transport mechanism 4 is used to transport scrap steel to the unloading mechanism. The unloading mechanism is used to add scrap steel into the converter 1.

[0038] Specifically, the converter 1 is provided with a smoke outlet, and the movable cover 21 is connected to the smoke outlet. The smoke from the converter 1 enters the movable cover 21 under the action of the fan. The movable cover 21 and the residual heat pipe 22 are arranged vertically, and the connecting pipe 24 and the heat-insulating smoke cover assembly 23 are arranged horizontally. The heat-insulating smoke cover assembly 23 can be square, round or oval as a whole. Figure 3 As shown, the connecting pipe 24 can be integrated as part of the residual heat pipe 22. The connecting pipe 24 is located at the rear end of the residual heat pipe 22. The residual heat pipe 22 and the connecting pipe 24 have the same internal structure, and both can recover waste heat from the flue gas. The connecting pipe 24 can be connected to the front sidewall of the insulated flue gas hood assembly 23 to optimize the swirl effect of the flue gas. The height of the connecting pipe 24 at the connection point on the insulated flue gas hood assembly 23 is higher than the stacking height of the scrap steel inside the insulated flue gas hood assembly 23. The exhaust duct 3 is used to discharge the flue gas after preheating the scrap steel to the steel plant's flue gas treatment equipment for treatment.

[0039] The rear end of the thermal insulation smoke hood assembly 23 is open, and the transport mechanism 4 can enter and exit the thermal insulation smoke hood assembly 23 through the rear end opening of the thermal insulation smoke hood assembly 23. The external scrap steel adding device adds the scrap steel into the transport mechanism 4, and the transport mechanism 4 enters the thermal insulation smoke hood assembly 23 to transport the scrap steel to the unloading mechanism. The scrap steel is preheated by the flue gas in the thermal insulation smoke hood assembly 23, and the unloading mechanism then adds the scrap steel into the converter 1. Then, the transport mechanism 4 returns to the scrap steel adding device to re-add the scrap steel, and the cycle repeats. The scrap steel adding device can be included in this embodiment to improve the loading efficiency of the scrap steel. The track 41 can be integrally arranged at the bottom of the thermal insulation smoke hood assembly 23, the front end of the track 41 extends to the unloading mechanism, and the rear end of the track 41 can extend out of the rear end opening of the thermal insulation smoke hood assembly 23. The track 41 can be a U-shaped channel steel.

[0040] In this embodiment, the mobile cover 21 is connected to the smoke outlet of the converter 1, and the flue gas of the converter 1 is introduced into the heat-insulating smoke hood assembly 23. The heat in the smoke is used to preheat the scrap steel, thereby improving energy utilization efficiency and reducing production costs. After the smoke preheats the scrap steel, the harmful substances in the smoke (including smoke that cannot be stored in the steel plant's gas storage cabinet and low-concentration carbon monoxide smoke at the beginning and end of blowing) react with the scrap steel and are utilized, which conforms to the concept of green environmental protection and reduces the impact on the environment. The mobile cover 21 can move in the horizontal and vertical directions and can adapt to the position of the converter 1. When the converter 1 is in different positions, it can be docked with the smoke outlet of the converter 1, which is convenient for docking with the converter 1 and the use of this embodiment. The scrap steel conveying mechanism can transfer the scrap steel to the converter 1, facilitating the transportation of the scrap steel. The transportation mechanism 4 and the heat-insulating smoke hood assembly 23 cooperate to increase the contact time between the scrap steel and the converter smoke and improve the scrap steel preheating efficiency. The connecting pipe 24 is vertically connected to the thermal insulation hood assembly 23, which can form a swirling flow when the flue gas enters the thermal insulation hood assembly 23 through the connecting pipe 24. This increases the residence time of the flue gas in the thermal insulation hood assembly 23, improves the heat exchange efficiency between the flue gas and the scrap steel, and thus increases the scrap steel ratio. At the same time, it can also shorten the layout length of the residual heat pipe 22, reduce equipment investment costs, and achieve both energy conservation and economic benefits.

[0041] In one embodiment, Figure 1 、 Figure 8 and Figure 9 As shown, the thermal insulation smoke hood assembly 23 includes an inclined thermal insulation smoke hood 23a and a horizontal thermal insulation smoke hood 23b which are connected in sequence from front to back. The front end height of the inclined thermal insulation smoke hood 23a is smaller than the rear end height thereof. The connecting pipe 24, the inclined thermal insulation smoke hood 23a and / or the horizontal thermal insulation smoke hood 23b are provided with spiral guide plates extending along their respective axes.

[0042] Specifically, the inclined thermal insulation fume hood 23a is closed at the front and open at the rear, while the horizontal thermal insulation fume hood 23b is open at both ends. By arranging the inclined thermal insulation fume hood 23a so that the front is lower and the rear is higher, the unloading mechanism cooperates with the inclined thermal insulation fume hood 23a, allowing the scrap transported by the transport mechanism 4 to be directly fed into the unloading mechanism. Figure 8 and Figure 9 In the embodiment, the connecting pipe 24 and the smoke exhaust duct 3 are respectively connected to the side surfaces of both ends of the heat-insulating smoke hood assembly 23.

[0043] The spiral guide plate can be concentrically arranged with the connecting duct 24, the inclined thermal insulation smoke hood 23a, and the horizontal thermal insulation smoke hood 23b. The spiral guide plates within the connecting duct 24, the inclined thermal insulation smoke hood 23a, and the horizontal thermal insulation smoke hood 23b can be independently installed. The distance between the outer peripheral wall of the spiral guide plate and the inner wall of the connecting duct 24, the inclined thermal insulation smoke hood 23a, and the horizontal thermal insulation smoke hood 23b is greater than or equal to zero. By installing a spiral guide plate within at least one of the connecting duct 24, the inclined thermal insulation smoke hood 23a, and the horizontal thermal insulation smoke hood 23b, the heat transfer area can be increased, making the heat exchange effect more significant. Furthermore, the spiral guide plate can cause flue gas turbulence, thereby generating greater frictional resistance. This resistance disrupts the molecular motion within the flue gas, thereby increasing the heat transfer coefficient, extending the residence time of the flue gas, and improving the heat transfer effect.

[0044] In one embodiment (not shown in the figures), the shape, pitch and / or inclination of the spiral guide plate are adjustable.

[0045] Specifically, the shape, pitch and inclination of the spiral guide plate can be adjusted with the stacking height of the scrap steel, and can also be adjusted with the diameters of the connecting pipe 24, the inclined thermal insulation fume hood 23a and the horizontal thermal insulation fume hood 23b to obtain the best heat transfer effect.

[0046] In one embodiment, Figures 1 to 3 As shown, the rear end of the horizontal thermal insulation fume hood 23b is connected to the wind inlet prevention channel 5, and the top height of the wind inlet prevention channel 5 is smaller than the top height of the horizontal thermal insulation fume hood 23b.

[0047] The bottom wall height of the wind inlet prevention channel 5 is equal to the bottom wall height of the rear opening of the horizontal thermal insulation fume hood 23b. This arrangement prevents hot air from escaping through the rear opening of the horizontal thermal insulation fume hood 23b and prevents the rear opening of the horizontal thermal insulation fume hood 23b from drawing in wind from the tail, thereby maintaining a low flue gas concentration within the scrap heating channel and improving the preheating effect on the scrap. Furthermore, a small amount of flue gas also enters the wind inlet prevention channel 5, allowing the scrap to come into contact with the flue gas earlier, increasing the contact time between the scrap and the flue gas and improving the preheating effect on the scrap.

[0048] In one embodiment, Figure 1As shown, an automatic sealing fire wall 51, a cold air sealing wall 52 and a scrap steel height control wall 53 are sequentially arranged in the anti-air inlet channel 5 from front to back. The automatic sealing fire wall 51, the cold air sealing wall 52 and the scrap steel height control wall 53 all extend downward from the top wall of the anti-air inlet channel 5, and there is a gap between them and the bottom wall of the anti-air inlet channel 5.

[0049] Specifically, the top ends of the automatic sealing fire wall 51, the cold air sealing wall 52, and the scrap height control wall 53 are respectively connected to the top wall of the air inlet prevention duct 5, while their bottom ends extend downward. The bottom ends of the automatic sealing fire wall 51, the cold air sealing wall 52, and the scrap height control wall 53 can be set to the same or different heights. A gap is provided between the bottom ends of the automatic sealing fire wall 51, the cold air sealing wall 52, and the scrap height control wall 53 and the bottom wall of the air inlet prevention duct 5, allowing the conveyor mechanism 4 to transport the scrap through.

[0050] The automatic sealing firewall 51, the cold air sealing wall 52, and the scrap height control wall 53 further prevent hot air from escaping from the rear opening of the horizontal thermal insulation smoke hood 23b and prevent the rear opening of the horizontal thermal insulation smoke hood 23b from being drawn in by tail wind. The transport mechanism 4 moves forward and passes under the scrap height control wall 53. When the scrap stack height exceeds the bottom height of the scrap height control wall 53, the bottom of the scrap height control wall 53 intercepts the scrap that is higher than its bottom, allowing the remaining scrap to continue to be transported forward by the transport mechanism 4. The scrap height control wall 53 controls the stack height of the scrap transported by the transport mechanism 4, thereby controlling the thickness of the scrap entering the horizontal thermal insulation smoke hood 23b each time, allowing the scrap to better absorb the heat from the flue gas. If the scrap thickness entering the horizontal thermal insulation smoke hood 23b is too high each time, the scrap will accumulate, affecting the scrap's ability to absorb the flue gas.

[0051] In one embodiment, Figure 1 As shown, the automatic sealing firewall 51 is located at the front end opening of the wind inlet prevention channel 5.

[0052] The automatic sealing fire wall 51 is set at the front end opening of the anti-air inlet channel 5, that is, the automatic sealing fire wall 51 is located at the connection point between the horizontal thermal insulation smoke hood 23b and the anti-air inlet channel 5, which can further prevent the hot air from escaping from the rear end opening of the horizontal thermal insulation smoke hood 23b, and avoid the rear end opening of the horizontal thermal insulation smoke hood 23b from sucking in the tail wild wind.

[0053] In one embodiment, Figure 1As shown, the unloading mechanism includes a hopper 61 and a unloading driving device 62 that drives the hopper 61 to pitch and tilt. The feed end and the discharge end of the hopper 61 are respectively provided with a feed baffle and a discharge baffle. A discharge port that cooperates with the discharge baffle is correspondingly provided in the thermal insulation fume hood assembly 23, and the feed baffle and the discharge baffle are alternately opened and closed.

[0054] Specifically, the inner wall of the inclined thermal insulation fume hood 23a is provided with a corresponding discharge port that cooperates with the discharge damper. The discharge drive device 62 can be a hydraulic cylinder, supported at the bottom of the hopper 61 and supported by hydraulic cylinder supports 63. There can be multiple hydraulic cylinders, evenly distributed at the bottom of the hopper 61. When the hopper 61 is feeding, the feed damper opens, the discharge damper closes, and the conveying mechanism 4 inputs the scrap into the hopper 61. When the hopper 61 is feeding scrap into the converter 1, the discharge damper opens, the feed damper closes, and the hopper 61 is driven by four hydraulic cylinders evenly arranged at the bottom. The front end of the hopper 61 tilts downward, and the scrap enters the converter 1 from the hopper 61 through the discharge port. After the scrap is added, the hydraulic cylinder drives the hopper 61 to reset.

[0055] The above structure can control the amount of scrap steel added to the converter 1 each time, so that the scrap steel transported to the heat-insulating fume hood assembly 23 can fully contact the fume, thereby improving the preheating effect of the scrap steel.

[0056] In one embodiment, Figure 2 、 Figure 3 as well as Figures 6 to 9 As shown, the smoke exhaust duct 3 is vertically connected to the rear end outer wall of the thermal insulation smoke hood assembly 23. Figures 6 to 9 In the figure, the connecting pipe 24, the heat preservation smoke hood component 23 and the smoke exhaust duct 3 are not shown. Wherein, the connecting pipe 24 and the smoke exhaust duct 3 are connected to the two end sides of the heat preservation smoke hood component 23 respectively.

[0057] Similarly to the connection method of the connecting pipe 24 on the thermal insulation smoke hood assembly 23, the exhaust duct 3 is vertically connected to the outer wall of the thermal insulation smoke hood assembly 23, which can form a vortex when the thermal insulation smoke hood assembly 23 is discharged into the exhaust duct 3, thereby increasing the residence time of the smoke in the scrap heating channel, improving the heat exchange efficiency between the smoke and scrap, and thus increasing the scrap ratio. At the same time, it can also shorten the layout length of the residual heat pipe 22, reduce equipment investment costs, and achieve a dual improvement in energy conservation and consumption reduction and economic benefits. In addition, when the connecting pipe 24 and the exhaust duct 3 are both connected vertically, the speed at which the smoke is discharged from the exhaust duct 3 can be further slowed down.

[0058] In one embodiment, Figure 1 As shown, the transport mechanism 4 includes a charging trolley and a plurality of charging trolley driving members 42 , and the plurality of charging trolley driving members 42 are arranged on the track 41 at intervals along the extension direction of the track 41 .

[0059] The charging cart can move along the track 41 along its extension, transporting scrap forward and retracting to reload. The charging cart's drive element 42 can be a vibrator, with multiple vibrators evenly spaced along the length of the track 41, which can be made of U-shaped channel steel. The vibrators continuously power the charging cart's drive element 42, improving the cart's movement efficiency.

[0060] In one embodiment, a heat-insulating refractory material is laid in the residual heat pipe 22 , and / or a water-cooling pipe is provided in the residual heat pipe 22 .

[0061] Both thermal insulation refractory materials and water-cooling pipes can better absorb waste heat in the flue gas, and then transfer the heat to heat storage equipment for secondary utilization, thereby improving energy utilization.

[0062] In one embodiment, the thermal insulation fume hood assembly 23 is made of high temperature resistant and wear resistant materials and is supported by a steel structure on the outside.

[0063] In one embodiment, the wind inlet prevention channel 5 is supported by a steel structure.

[0064] In one embodiment (not shown in the figure), the transport mechanism 4 also includes a high-temperature corridor arranged in the thermal insulation smoke hood assembly 23, the upper part of the high-temperature corridor is made of heat-resistant insulation material, and the bottom is a track 41 of U-shaped channel steel structure.

[0065] In one embodiment, the smoke exhaust duct 3 is surrounded by refractory materials and steel structures, and its shape can be circular or square.

[0066] In one embodiment, the smoke exhaust duct 3 and the connecting pipe 24 are vertically connected to different sides of the thermal insulation smoke hood assembly 23.

[0067] It should be noted that Figure 4 What is shown is the heating flue gas flow field in the existing conventional technical solution. Figure 5 The following is the scrap heating temperature in the conventional technical solution. The flow of flue gas in the heat-insulating flue gas hood assembly 23 in the conventional technical solution is as follows: Figure 4 As shown, the flue gas flows horizontally within the insulated flue gas hood assembly 23, making it difficult for air to enter the scrap. This heats only the scrap surface, resulting in a small heat exchange area. The hot air's residence time within the insulated flue gas hood assembly 23 is short, resulting in a minimal drop in flue gas temperature and a limited scrap heating effect. Due to the low density of hot air and the high density of cold air, the flue gas temperature on the scrap surface is low, while the temperature at the top of the hood is high, resulting in poor scrap preheating.

[0068] like Figures 6 to 9 As shown, Figure 6 and Figure 7No spiral guide plate is added in the thermal insulation fume hood assembly 23 , and only a connecting pipe 24 vertically connected to the thermal insulation fume hood assembly 23 is added. Figure 6 and Figure 7 The embodiments shown are relatively Figure 8 and Figure 9 The embodiment shown is relatively simple, requires less investment and has lower cost. Figure 8 and Figure 9 The implementation method shown increases the construction difficulty and the cost. Figures 6 to 9 It can be seen that both implementation methods can make the flue gas form a swirl in the scrap steel heating channel. Figure 8 and Figure 9 In the embodiment shown, more flue gas penetrates into the scrap steel and has a better heating effect on the scrap steel.

[0069] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A converter flue gas scrap heating device, characterized in that: include: The scrap heating channel includes a movable cover, a residual heat pipe, a connecting pipe, and a heat-insulating fume hood assembly connected in sequence. The movable cover is used to communicate with the converter. The heat-insulating fume hood assembly is connected to a flue gas duct. The connecting pipe is vertically connected to the front side wall of the heat-insulating fume hood assembly. The residual heat pipe can move horizontally and vertically with the movable cover. The scrap steel conveying mechanism includes a transport mechanism, a discharge mechanism and a track. The discharge mechanism is arranged in the front end of the thermal insulation fume hood assembly. The track is arranged in the thermal insulation fume hood assembly along the extension direction of the thermal insulation fume hood assembly. The transport mechanism is movably arranged on the track. The transport mechanism is used to transport scrap steel to the discharge mechanism. The discharge mechanism is used to add scrap steel into the converter.

2. The converter flue gas scrap heating equipment according to claim 1, characterized in that: The thermal insulation fume hood assembly includes an inclined thermal insulation fume hood and a horizontal thermal insulation fume hood that are connected in sequence from front to back. The front end height of the inclined thermal insulation fume hood is smaller than the rear end height. The connecting pipeline, the inclined thermal insulation fume hood and / or the horizontal thermal insulation fume hood are provided with spiral guide plates extending along their respective axes.

3. The converter flue gas scrap heating equipment according to claim 2, characterized in that: The shape, pitch and / or inclination angle of the spiral guide plate are adjustable.

4. The converter flue gas scrap heating equipment according to claim 2, characterized in that: The rear end of the horizontal thermal insulation fume hood is connected to an anti-wind inlet passage, and the top height of the anti-wind inlet passage is smaller than the top height of the horizontal thermal insulation fume hood.

5. The converter flue gas scrap heating equipment according to claim 4, characterized in that: The anti-air inlet passage is provided with an automatic sealing fire wall, a cold air sealing wall and a scrap steel height control wall from front to back. The automatic sealing fire wall, the cold air sealing wall and the scrap steel height control wall all extend downward from the top wall of the anti-air inlet passage and have a gap between them and the bottom wall of the anti-air inlet passage.

6. The converter flue gas scrap heating equipment according to claim 5, characterized in that: The automatic sealing fire wall is located at the front end opening of the wind inlet prevention channel.

7. The converter flue gas scrap heating equipment according to claim 1, characterized in that: The unloading mechanism includes a hopper and a unloading drive device that drives the hopper to pitch and tilt. The feed end and the discharge end of the hopper are respectively provided with a feed baffle and a discharge baffle. A discharge port that cooperates with the discharge baffle is correspondingly provided in the thermal insulation fume hood assembly, and the feed baffle and the discharge baffle are alternately opened and closed.

8. The converter flue gas scrap heating equipment according to claim 1, characterized in that: The smoke exhaust duct is vertically connected to the rear end outer wall of the thermal insulation smoke hood assembly.

9. The converter flue gas scrap heating device according to claim 1, characterized in that: The transport mechanism includes a charging trolley and a plurality of charging trolley driving members, and the plurality of charging trolley driving members are arranged on the track at intervals along an extension direction of the track.

10. The converter flue gas scrap heating device according to claim 1, characterized in that: The residual heat pipe is paved with heat-insulating refractory materials, or a water-cooling pipe is provided in the residual heat pipe.

Images