Side wall guide preheating groove and continuous feeding preheating device and preheating method thereof

Abstract

The present invention relates to a side wall guide preheating groove, a continuous feeding preheating device with the side wall guide preheating groove, and a preheating method thereof, and belongs to the field of electric furnace steelmaking. The side wall guide preheating groove is improved by adding a baffle plate on the basis of a traditional feeding trough. The flow direction of the flue gas is changed through the side wall guide flue, and the difficult problem of through-type preheating of scrap steel under continuous feeding state is realized, so that the preheating effect of scrap steel is greatly improved compared with the traditional horizontal continuous feeding. The flue gas baffle mechanism added to the preheating device can adjust the inlet opening of the top flue gas channel accordingly. The whole equipment has a simple structure, low investment, and convenient maintenance. It is not only flexible in regulation, but also has better energy-saving effect.

Description

Technical Field

[0001] The invention belongs to the field of electric furnace steelmaking, and particularly relates to a side wall guide preheating groove, a continuous feeding preheating device with the side wall guide preheating groove, and a preheating method thereof. Background Art

[0002] "Energy saving, environmental protection, and automation" have always been the core points of the development of electric arc furnace steelmaking technology. According to the law of conservation of energy, the energy required for smelting molten steel in electric furnace smelting is constant. To reduce the power consumption of electric furnace smelting, technical means such as recovering waste heat from electric furnace flue gas and partially replacing electrical energy with chemical energy can be used.

[0003] The scrap preheating electric arc furnace is an energy-saving technology. The scrap flue gas preheating technology for electric arc furnaces, which emerged in the late 1980s, is a typical energy-saving technology, exemplified by CONSTEEL (US5400358). CONSTEEL technology has undergone nearly 30 years of development and is relatively mature. Its flat-pool smelting reduces grid impact, reduces furnace maintenance, and achieves significant energy savings in actual production. However, CONSTEEL has demonstrated inferior energy-saving performance compared to vertical furnaces. Therefore, improving flue gas utilization efficiency in continuous-charging furnaces is a key energy-saving goal, a long-term task, and a key area for improvement. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a side wall guide preheating groove, a continuous feeding preheating device with the side wall guide preheating groove and a preheating method thereof, so as to improve the preheating effect of the material.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A side wall diversion preheating groove includes a U-shaped feed trough and two L-shaped baffle plates. Along the length direction of the feed trough, the two baffle plates are arranged in an inverted form on both sides of the inner cavity of the feed trough. The two baffle plates are detachably connected to the two side walls of the feed trough through connecting parts. The two side walls of the feed trough and the corresponding baffle plates connected thereto cooperate to form two side wall diversion flues. A smoke overflow gap is left between the lower edges of the two baffle plates and the bottom surface of the inner cavity of the feed trough.

[0007] Furthermore, along the material conveying direction, the height of the smoke overflow gap gradually increases.

[0008] Furthermore, the bottom surface of the trough body of the material conveying trough has a step section that gradually descends along the material conveying direction, and the step section is arranged at one end where the material conveying trough is connected to the electric furnace.

[0009] Furthermore, a heat insulation layer is provided on the inner surface of the side wall flue gas duct.

[0010] Furthermore, along the material conveying direction, the width of the side wall guide flue formed by the material conveying trough and the material baffle plate gradually increases.

[0011] A continuous feeding and preheating device comprises a batching conveying trough, a side wall guide preheating groove and a trolley connecting trough which are connected in sequence along the material conveying direction, a smoke hood is buckled above the side wall guide preheating groove; a dust removal port is provided at the tail end of the smoke hood along the direction of smoke flow; the trolley connecting trough is movable and its discharge end is connected with the feed end of the electric furnace, the feed end of the trolley connecting trough is provided with a stepped section connected with the side wall guide preheating groove, the stepped section has at least one level and its steps are downward along the material conveying direction; a front smoke hood is buckled above the trolley connecting trough, and the two ends of the front smoke hood are correspondingly connected with the electric furnace and the smoke hood.

[0012] As described above, when materials are transported in the side wall guide preheating grooves, the materials piled in the side wall guide preheating grooves, the exposed upper surface of the side wall guide preheating grooves, and the smoke hood together form a top smoke channel.

[0013] Furthermore, a smoke blocking mechanism is provided at one end of the front smoke hood connected to the smoke hood, and the smoke blocking mechanism corresponds to the inlet end of the top smoke channel to adjust the inlet opening of the top smoke channel.

[0014] Furthermore, the smoke blocking mechanism is a baffle, one end of which is hinged on the front smoke hood and its deflection is controlled by a deflection mechanism; or, the smoke blocking mechanism is a telescopic baffle; or, the smoke blocking mechanism is a baffle, which is inserted into the front smoke hood and its extension into the front smoke hood is controlled by a lifting mechanism.

[0015] Furthermore, the side wall guide preheating groove and the trolley connection groove are arranged at an angle of -100° to 100°.

[0016] The preheating method applied to the above-mentioned continuous feeding preheating device preheats the material in the side wall guide preheating groove through two side wall guide flues and a top flue gas channel, wherein the flue gas flowing into the two side wall guide flues overflows from the flue gas overflow gap at the bottom, and the flue gas in the side wall guide flue is guided to the bottom of the material in the groove, thereby performing penetrating material preheating.

[0017] Furthermore, a baffle is provided at one end of the front smoke hood connected to the smoke hood, and the baffle corresponds to the inlet end of the top smoke channel. By adjusting the baffle to control the inlet opening of the top smoke channel, the proportion of the smoke entering the two side wall guide flues and the top smoke channel is adjusted, thereby controlling the material preheating effect and dust removal effect.

[0018] Furthermore, along the flue gas flow direction, the cross-sectional area of the top flue gas channel is adjusted and controlled to gradually increase.

[0019] Furthermore, along the flue gas flow direction, the cross-sectional area of the top flue gas channel gradually increases.

[0020] The beneficial effects of the present invention are:

[0021] (1) By changing the trough structure of the traditional horizontal continuous feeding trough, a sidewall guide flue is formed. The sidewall guide flue changes the flow direction of the flue gas, and the flue gas penetrates the scrap steel layer from the bottom of the material layer, thus achieving the difficult problem of through-type preheating of scrap steel under continuous feeding. The preheating effect of scrap steel is greatly improved compared with the traditional horizontal continuous feeding, and the energy saving effect can reach more than 60-80kwh / t (the traditional vibration continuous feeding is about 30-40kwh / t), and the electrode consumption is reduced.

[0022] (2) The equipment has a simple structure, low investment, convenient maintenance, and high equipment reliability. The side wall guide flue is improved by adding a baffle plate on the basis of the traditional feeding trough. It has a simple structure and is easy to maintain.

[0023] (3) The side wall guide flue will not be blocked, and the non-resonant vibration will bring the settled dust into the electric furnace. The movement of a small amount of scrap steel will also take away the dust into the electric furnace. The equipment has few process links and the system is reliable.

[0024] (4) It can be used to transform existing traditional vibrating continuous feeding equipment.

[0025] (5) Compared with the existing vertical furnace, the energy-saving effect is similar, but the equipment is lower in height and easy to operate and maintain, and the equipment reliability is higher. More importantly, it realizes continuous charging, which changes the problems of unstable smelting pool, power grid flicker, smelting noise and flue gas emission pulses caused by batch charging of the vertical furnace.

[0026] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0028] Figure 1 This is a schematic diagram of the preheating section formed by the side wall guide preheating groove and the smoke hood;

[0029] Figure 2 It is the structural relationship diagram of the material conveying trough and the material baffle;

[0030] Figure 33D diagram of the working principle of the side wall preheating groove and the material conveying trough (without steps, half side)

[0031] Figure 4 3D diagram of the working principle of the side wall guide preheating groove and the ingredient conveying trough (with steps, half side);

[0032] Figure 5 This is a schematic diagram of the preheating section formed by the side wall guide preheating groove and the smoke hood (structural deformation);

[0033] Figure 6 Schematic diagram of continuous feeding preheating device with flue gas flow direction (also Figure 7 AA section view);

[0034] Figure 7 for Figure 6 A top view of

[0035] Figure 8 This is a schematic diagram showing the trolley connection groove and the side wall guide preheating groove arranged at an angle.

[0036] Reference numerals:

[0037] Side wall guide preheating groove 1, electric furnace 2, ingredient conveying trough 3, trolley connecting trough 4, smoke hood 5, top smoke channel 501, dust removal port 6, front smoke hood 7, material 8, smoke baffle mechanism 9;

[0038] In the side wall guide preheating groove: a material conveying trough 101, a material baffle 102, a connecting piece 103, a side wall guide flue 104, a flue gas overflow gap 105, a stepped section 106, and a heat insulation layer 107;

[0039] Flue gas 201 (guided from the two side wall flue gas ducts), flue gas 202 (flowing through the top flue gas channel); stepped section 401, top flue gas channel 501. DETAILED DESCRIPTION

[0040] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0041] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0042] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] See also Figures 1 to 5 , is a side wall diversion preheating groove 1, including a U-shaped feed trough 101, and two L-shaped baffle plates 102. Along the length direction of the feed trough 101, the two baffle plates 102 are inverted and arranged on both sides of the inner cavity of the feed trough 101. The two baffle plates 102 are detachably connected to the two side walls of the feed trough 101 through connecting pieces 103. The two side walls of the feed trough 101 and the baffle plates 102 correspondingly connected thereto cooperate to form two side wall guide flues 104. A smoke overflow gap 105 is left between the lower edges of the two baffle plates 102 and the bottom surface of the inner cavity of the feed trough 101.

[0044] The feed trough 101 in the side wall diversion preheating groove 1 is a traditional feeding trough. By adding a baffle plate 102 thereon, on the one hand, the pile shape of the material (i.e., scrap steel) in the trough is changed. On the other hand, the baffle plate 102 cooperates with the side wall of the feed trough 101 to form a side wall diversion flue 104 with a gap at the bottom. The two side wall diversion flues 104 serve as flue gas channels. The electric furnace flue gas enters these two flue gas channels and overflows from the gap at the bottom (i.e., the flue gas overflow gap 105), and then enters the gap of the material and converges upward to the dust removal port, thereby realizing penetrating material preheating.

[0045] In this embodiment, the baffle plate 102 is connected to the top surface of the feeding trough 101 by a connector 103 such as bolts and nuts, and can be disassembled for maintenance. At the same time, this method requires little improvement to the existing feeding trough and can save costs.

[0046] As a further improvement of the above solution, the bottom surface of the trough 101 has a step section 106 that gradually descends along the material conveying direction. Figure 4 As shown, the stepped section 106 is provided at the end where the trough 101 connects to the electric furnace 2. The stepped section 106 increases the gap between the lower edge of the baffle plate 102 and the bottom surface of the inner cavity of the trough 101, causing the gap to gradually expand in the direction of material conveyance. This not only prevents material jamming but also increases the amount of flue gas that escapes from the sidewall flue duct 104, thereby improving the preheating effect.

[0047] Of course, according to the improvement idea of "gradually increasing the height of the smoke overflow gap along the material conveying direction", the size of the smoke overflow gap 105 can also be changed by adjusting the structural dimensions of the baffle plate 102, such as gradually reducing the height of the plate surface on the baffle plate 102 that forms a gap with the bottom surface of the feed trough 101.

[0048] Preferably, the inner surface of the side wall guide flue 104 is provided with a heat insulating layer 107. The heat insulating layer 107 can be a coated heat insulating paint or a laid heat insulating material, which can further improve the thermal efficiency.

[0049] As a further improvement to the above solution, the width of the sidewall flue duct 104 formed by the material conveying trough 101 and the material baffle 102 gradually increases along the material conveying direction. This increases the flue gas inlet area of the sidewall flue preheating groove 1, further improving the preheating effect at the discharge end (i.e., the flue gas inlet end) of the sidewall flue preheating groove 1.

[0050] See also Figure 5 ,Should Figure 5 and Figure 1 Correspondingly, a U-shaped feed trough 101 with a variant cross-sectional shape and two baffle plates 102 with variant shapes are used. This type of variation is diverse and can be used to optimize the equipment structure, such as increasing the ventilation area of the two side wall guide flues 104, improving the preheating of scrap steel in the central area, etc. However, this structure still does not deviate from the basic scheme of the feed trough 101 and the baffle plate 102.

[0051] See also Figure 1 、 Figure 5 、 Figure 6 and Figure 7 A continuous feeding and preheating device comprises a batching conveying trough 3, a side wall guide preheating groove 1 and a trolley connecting groove 4 which are connected in sequence along the material conveying direction, and a smoke hood 5 is buckled above the side wall guide preheating groove 1; a dust removal port 6 is provided at the tail end of the smoke hood 5 along the direction of flue gas flow; the trolley connecting trough 4 is movable and its discharge end is connected with the feed end of the electric furnace 2, and the feed end of the trolley connecting trough 4 is provided with a stepped section 401 connected with the side wall guide preheating groove 1, and the stepped section 401 has at least one level and its steps are downward along the material conveying direction; a front smoke hood 7 is buckled above the trolley connecting trough 4, and the two ends of the front smoke hood 7 are correspondingly connected with the electric furnace 2 and the smoke hood 5.

[0052] In this continuous feeding preheating device, the trolley connection trough 4 can move forward and backward, allowing the preheating device to be connected or disconnected from the electric furnace 2 when needed. The tail end of the trolley connection trough 4 (the material feeding end) is provided with a stepped section 401, which has at least one step. The overlapping relationship between this stepped section 401 and the sidewall guide preheating groove 1 forms a high-level stepped structure, which causes the material to produce a large "tumbling" motion during the conveying process. This "tumbling" motion disturbs and disperses the material, thereby improving the preheating effect of the scrap steel.

[0053] As described above, when the material 8 is transported in the side wall guide preheating groove 1, the material 8 piled in the side wall guide preheating groove 1, the exposed upper surface of the side wall guide preheating groove 1, and the smoke hood 5 together form the top flue gas channel 501. The top flue gas channel 501 here is the third flue gas channel in the entire continuous feeding preheating device. It passes over the upper surface of the material to preheat the material; while the two side wall guide flue gas ducts 104 guide the electric furnace flue gas from the gap at the bottom (i.e., the flue gas overflow gap 105), then enter the bottom of the material, and converge upward through the gaps between the materials to the dust removal port, realizing penetrating material preheating.

[0054] As a further optimization of the above solution, a smoke blocking mechanism 9 is provided at one end of the front smoke hood 7 connected to the smoke hood 5. The smoke blocking mechanism 9 corresponds to the (smoke) inlet end of the top smoke channel 501 to adjust the inlet opening of the top smoke channel 501.

[0055] See also Figure 6The rear end of the front smoke hood 7 (the end connected to the smoke hood 5) is provided with a smoke blocking mechanism 9. Since the smoke blocking mechanism 9 just blocks the smoke inlet end of the top smoke channel 501, adjusting the smoke blocking mechanism 9 can adjust the size of the inlet opening of the top smoke channel 501, thereby adjusting the amount of smoke entering the three smoke channels. For example, if the smoke blocking mechanism 9 is closed / lowered so that it completely blocks the top smoke channel 501, the lower end of the smoke blocking mechanism 9 will abut against the material 8 flowing out of the material outlet end of the side wall guide preheating groove 1. The closure of the top smoke channel 501 will force the electric furnace smoke to flow mainly through the two side wall guide flues 104, then penetrate the gap inside the material 8 and be extracted by the dust removal port 6. This setting will enhance the penetration preheating effect of the material 8. Another example: fully open / lift the flue gas barrier mechanism 9 so that the flue gas inlet end of the top flue gas channel 501 is not blocked by the flue gas barrier mechanism 9. At this time, the electric furnace flue gas flowing out of the electric furnace 2 will be evenly and naturally distributed according to the resistance of the three flue gas channels. Generally speaking, the channel resistance of the top flue gas channel 501 is the smallest. At this time, most of the flue gas will be drawn away by the dust removal port 6 through the top flue gas channel 501 (which can be designed to be 60%). At this time, the effect of enhancing the preheating of the material 8 will be reduced. However, since some flue gas can still penetrate the gaps in the material layer, the preheating effect will still be better than that of the traditional surface preheating type continuous feeding device. It should also be noted here that the size of the channel resistance can be optimized by changing the cross-sectional area of the three flue gas channels.

[0056] The above-mentioned side wall guide preheating groove 1 structural optimization method records that "the bottom surface of the trough 101 is connected to the end of the electric furnace 2 and a step section 106 is provided". Figure 4 Regarding this optimization method, it should be noted that the provision of the stepped section 106 increases the depth of the feed trough 101 at this section, thereby increasing the channel area of the two sidewall guide flues 104 in the sidewall guide preheating groove 1 (the channel area at the entrance area of the two sidewall guide flues 104 can be increased by 20-40%), which helps to reduce the flow resistance of the flue gas 201, with significant effects. At the same time, this structure also facilitates the overlapping connection between the sidewall guide preheating groove 1 and the trolley connection groove 4.

[0057] The smoke blocking mechanism 9 in this solution is a baffle. The structural form of the deflection mechanism is not specifically limited in this solution. It can adopt existing mature devices or mechanisms. For example, the baffle can be directly installed on the front smoke hood through the deflection mechanism and driven by the deflection mechanism to swing. In this case, the deflection mechanism can be a crank rocker mechanism installed on the front smoke hood, that is, the crank rotates to pull the connecting rod, and the connecting rod pulled by the crank drives the rocker to swing. The rocker is rotatably mounted on the front smoke hood, and the baffle is mounted on the rocker. As the rocker swings, the baffle either blocks the top smoke channel 501 or is lifted above the front smoke hood to expose the top smoke channel 501. Alternatively, one end of the baffle can be directly hinged to the front smoke hood and pulled or lowered by a mechanism such as a telescopic rod.

[0058] Of course, the smoke barrier mechanism can also be configured as a telescopic baffle, and the opening of the top smoke duct 501 inlet can be adjusted by controlling the baffle's own extension and contraction. The baffle can also be installed on the front smoke hood, and its extension into the front smoke hood can be controlled by a lifting mechanism disposed outside the front smoke hood. That is, when the lifting mechanism controls the baffle to rise, the opening of the top smoke duct 501 inlet increases, and when the lifting mechanism controls the baffle to descend, the opening of the top smoke duct 501 inlet decreases.

[0059] The continuous feeding preheating device has another arrangement form, such as Figure 8 As shown, the side wall guide preheating groove 1 and the trolley connection groove 4 are arranged at an angle of -100° to 100°. This form can meet the layout needs of some workshops.

[0060] The preheating method of the above-mentioned continuous feeding preheating device is characterized by disposing two sidewall guide flues 104 in the sidewall guide preheating groove 1. The smoke hood 5 and the surface of the material form a flue gas channel, for a total of three flue gas channels. Furnace flue gas 201 guided by the two sidewall guide flues 104 overflows through the flue gas overflow gap 105 into the gaps between the material 8 and converges upward at the dust removal port 6, penetrating the gaps between the material and preheating the material 8. Flue gas 201 guided by the top flue gas channel 501 sweeps over the surface of the material 8, preheating it. The three flue gas channels (one channel 202 and two channels 201) converge and are then extracted through the dust removal port 6.

[0061] A further optimization of the above-mentioned preheating method is to add a corresponding baffle as mentioned above, and control the inlet opening of the top flue gas channel 501 by adjusting the baffle, thereby adjusting the distribution ratio of the flue gases 201 and 202 entering the two side wall guide flues 104 and the top flue gas channel 501, thereby controlling the material preheating effect and dust removal effect.

[0062] See also Figure 6 、 Figure 7The tail end of the side wall guide preheating groove 1 is connected to the (cold) ingredient conveying trough 3, and the dust removal port 6 is arranged at the tail end of the smoke hood 5, and the smoke hood 5 is buckled above the side wall guide preheating groove 1. The flue gas 201 guided out from the two side wall guide flues 104 will converge at the dust removal port 6, and the flue gas 202 flowing through the top flue gas channel 501 will also flow to and converge at the dust removal port 6. Therefore, it is preferred to design the top flue gas channel 501 into a structure in which the cross-sectional area gradually increases toward the dust removal port 6.

[0063] In addition, the feeding speed of the trolley connection groove 4 can also be controlled. A faster feeding speed can reduce the thickness of the material 8 in the trolley connection groove 4, which is beneficial for preheating the material in this section. It should also be noted that the sidewall guide preheating groove and its continuous feeding preheating device preferably use a non-resonant exciter. The non-resonant vibration will bring settled dust into the electric furnace. The movement of small amounts of scrap steel will also carry dust into the electric furnace. This equipment has fewer process links and a more reliable system.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A sidewall guide preheating groove, comprising a U-shaped feed trough, characterized in that: It also includes two L-shaped baffle plates. Along the length direction of the feed trough, the two baffle plates are inverted and arranged on both sides of the inner cavity of the feed trough. The two baffle plates are detachably connected to the two side walls of the feed trough through connecting parts. The two side walls of the feed trough and the corresponding baffle plates connected thereon cooperate to form two side wall guide flues. A gap for smoke overflow is left between the lower edges of the two baffle plates and the bottom surface of the inner cavity of the feed trough.

2. The side wall guide preheating groove according to claim 1, characterized in that: Along the material conveying direction, the height of the smoke overflow gap gradually increases.

3. The side wall guide preheating groove according to claim 2, characterized in that: The bottom surface of the trough body of the material conveying trough is provided with a step section which gradually descends along the material conveying direction. The step section is arranged at one end where the material conveying trough is connected to the electric furnace.

4. The side wall guide preheating groove according to claim 1, characterized in that: The inner cavity surface of the side wall guide flue is provided with a heat insulation layer.

5. The side wall guide preheating groove according to claim 1, characterized in that: Along the material conveying direction, the width of the side wall guide flue formed by the material conveying trough and the material baffle plate gradually increases.

6. A continuous feeding and preheating device, comprising a batching conveying trough, a sidewall guide preheating groove, and a trolley connection trough, which are sequentially connected along the material conveying direction; a smoke hood is buckled above the sidewall guide preheating groove; a dust removal port is provided at the rear of the smoke hood along the direction of smoke flow; the trolley connection trough is movable, and its discharge end is connected to the feed end of the electric furnace; the feed end of the trolley connection trough is provided with a stepped section connected to the sidewall guide preheating groove, the stepped section having at least one step, and the steps thereof are downwardly directed along the material conveying direction; a front smoke hood is buckled above the trolley connection trough, and the two ends of the front smoke hood are correspondingly connected to the electric furnace and the smoke hood; Its characteristics are: The side wall guide preheating groove is as described in any one of claims 1 to 5. When materials are transported in the side wall guide preheating groove, the materials piled in the side wall guide preheating groove, the exposed upper surface of the side wall guide preheating groove, and the smoke hood together form a top smoke channel.

7. The continuous feeding preheating device according to claim 6, characterized in that: A smoke blocking mechanism is provided at one end of the front smoke hood connected to the smoke hood. The smoke blocking mechanism corresponds to the inlet end of the top smoke channel to adjust the inlet opening of the top smoke channel.

8. The continuous feeding preheating device according to claim 7, characterized in that: The smoke blocking mechanism is a baffle, one end of which is hinged on the front smoke hood and its deflection is controlled by a deflection mechanism; or, the smoke blocking mechanism is a telescopic baffle; or, the smoke blocking mechanism is a baffle, which is inserted into the front smoke hood and its extension into the front smoke hood is controlled by a lifting mechanism.

9. The continuous feeding preheating device according to claim 7, characterized in that: The side wall guide preheating groove and the trolley connecting groove are arranged at an angle, and the angle is -100° to 100°.

10. A preheating method applied to the continuous feeding preheating device according to claim 6, characterized in that: The material in the side wall guide preheating groove is preheated through two side wall guide flues and a top flue gas channel, wherein the flue gas flowing into the two side wall guide flues overflows from the flue gas overflow gap at the bottom, and the flue gas in the side wall guide flue is guided to the bottom of the material in the groove, thereby performing penetrating preheating of the material.

11. The preheating method according to claim 10, characterized in that: A baffle is provided at one end of the front smoke hood connected to the smoke hood, and the baffle corresponds to the inlet end of the top smoke channel. By adjusting the baffle to control the inlet opening of the top smoke channel, the proportion of the smoke entering the two side wall guide flues and the top smoke channel is adjusted, thereby controlling the material preheating effect and dust removal effect.

12. The preheating method according to claim 10 or 11, characterized in that: Along the direction of flue gas flow, the cross-sectional area of the top flue gas channel is adjusted and controlled to gradually increase.

13. The preheating method according to claim 10 or 11, characterized in that: Along the flue gas flow direction, the cross-sectional area of the top flue gas channel gradually increases.

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