A middle air guide device for limestone rotary kiln preheater

Abstract

The present invention discloses a middle air guide device of a limestone rotary kiln preheater, which relates to the technical field of rotary kiln preheating equipment, including a material distribution pipe, a preheater connected to the bottom of the material distribution pipe, and a material discharge pipe connected to the bottom of the preheater. A first preheating mechanism is arranged on the outside of the material distribution pipe, and the first preheating mechanism includes a diverter air pipe connected to the top of the material discharge pipe, and a heat-conducting annular pipe is connected to the top of the diverter air pipe. The heat-conducting annular pipe is fixed to the top of the preheater and distributed on the outside of the bottom of the material distribution pipe; a second preheating mechanism is arranged inside the preheater, and the second preheating mechanism includes a diverter hood fixed to the middle of the preheater, and the diverter hood is connected to the inside of the preheater, and a plurality of rotating levers are evenly distributed on the outer surface of the diverter hood, and the rotating levers are rotatably connected to the diverter hood and distributed inside the preheater. The middle air guide device of a limestone rotary kiln preheater disclosed by the present invention has the effect of high preheating efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kiln preheating equipment, in particular to a middle air guide device of a limestone rotary kiln preheater. Background Art

[0002] The rotary kiln is composed of processes such as gas flow, fuel combustion, heat transfer and material movement, so that the fuel can be fully burned, the heat of fuel combustion can be effectively transferred to the material, and the material undergoes a series of physical and chemical changes after receiving the heat, and finally forms the finished clinker. The lime kiln is used to roast active lime and light-burned dolomite for steel mills and ferroalloy plants; and in order to improve the efficiency of the rotary kiln and reduce the power consumption of the kiln rotation, most limestone rotary kilns are equipped with vertical preheaters, which use the high-temperature exhaust gas of the rotary kiln to preheat the raw limestone.

[0003] The existing limestone rotary kiln preheater mainly utilizes the hot exhaust gas generated when the rotary kiln is working, and utilizes the gap channels generated during the accumulation of limestone in the preheater to heat the accumulated limestone; however, in actual use of the existing preheater, when there are too many stones accumulated inside the preheater, due to the small gaps between the stones and the excessive thickness of the stone accumulation, the heating efficiency of the limestone inside and on the top of the stone pile is insufficient, resulting in uneven preheating of the limestone, which affects the working efficiency of the preheater. Summary of the invention

[0004] The invention discloses a middle air guide device of a limestone rotary kiln preheater, aiming to solve the technical problem that when too much stone is piled up inside the existing limestone rotary kiln preheater, the limestone preheating is uneven, which affects the working efficiency of the preheater.

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

[0006] A middle air guide device of a limestone rotary kiln preheater, comprising a material distribution pipe, a preheater connected to the bottom of the material distribution pipe, a material discharge pipe connected to the bottom of the preheater, and a plurality of material pushing mechanisms rotatably installed on the outside of the preheater, wherein a first preheating mechanism is arranged on the outside of the material distribution pipe for preheating the limestone inside the material distribution pipe, wherein the first preheating mechanism comprises a flow distribution pipe connected to the top of the material discharge pipe, wherein the top of the flow distribution pipe is connected to a heat-conducting annular pipe, wherein the heat-conducting annular pipe is fixed to the top of the preheater and distributed on the outside of the bottom of the material distribution pipe;

[0007] A second preheating mechanism is provided inside the preheater for preheating the limestone inside the preheater, the second preheating mechanism comprises a flow divider hood fixed to the middle of the preheater, the flow divider hood is connected through the inside of the preheater, a plurality of rotating levers are evenly distributed on the outer surface of the flow divider hood, the rotating levers are rotatably connected to the flow divider hood and distributed inside the preheater;

[0008] Through the cooperation between the first preheating mechanism and the second preheating mechanism, the limestone entering the distribution pipe and the preheater is preheated multiple times, thereby improving the preheating effect of the limestone.

[0009] By respectively arranging a first preheating mechanism and a second preheating mechanism on the basis of a traditional limestone rotary kiln preheater, when the user introduces limestone from a distribution pipe into the interior of the preheater, the first preheater is used to divert a portion of the hot air generated by the rotary kiln into the interior of the distribution pipe, so that the falling limestone is intercepted and heated from the inside, and at the same time, the limestone falling into the preheater will be subjected to secondary internal heating and stirring by the second preheater, so that the preheating of the limestone is completed by multiple preheating and heating from the inside, thereby improving the preheating efficiency and effect.

[0010] In a preferred solution, the first preheating mechanism also includes a plurality of evenly distributed square sleeves penetrating the inner side of the heat-conducting annular tube, a push plate slidably sleeved on the outer side of each of the square sleeves, the push plate being an L-shaped structure, a plurality of evenly distributed electric push rods are installed on the top of the heat-conducting annular tube, the output end of each of the electric push rods is fixedly connected to the side of a push plate, a heating rod is fixed to the side of each push plate, the number of the heating rods is several and irregularly distributed along the vertical direction, the heating rod is slidably inserted into the interior of the distribution tube, a first air guide groove is provided inside each of the push plates and the heating rod, the first air guide groove is connected to the interior of the heat-conducting annular tube through the square sleeve.

[0011] By providing a diverter gas pipe structure connected to the discharge pipe, a part of the hot air generated by the rotary kiln during operation is diverted into the interior of the heat-conducting annular pipe to heat the heating rod. The electric push rod drives the push plate to move back and forth, driving the heating rod to enter the interior of the distribution pipe, and preliminarily preheating and intercepting the limestone falling from the distribution pipe, so that the limestone fully contacts the heating rod and is heated before falling, thereby improving the preheating efficiency of the traditional preheater for limestone.

[0012] In a preferred embodiment, the second preheating mechanism also includes a threaded rod rotatably installed between the interior of the distribution pipe and the heat-conducting annular tube for transmitting the rotating lever, the number of the threaded rods is several and each of the threaded rods is threadedly connected to the pushing plate passing through, a second air guide groove is opened inside each of the rotating levers, the second air guide groove is connected to the interior of the diverter cover, and a heat-conducting part is provided at the outer end of each of the rotating levers for transferring heat and stirring the accumulated limestone.

[0013] By additionally providing a diverter hood connected to the interior of the preheater on the basis of the preheater, a part of the hot air entering the preheater is diverted into the interior of the hollow rotating lever, and the hot air is directly introduced into the stacked limestone pile by using the rotating lever. At the same time, the threaded rod additionally threadedly connected to the push plate can drive the rotating lever to rotate along with the reciprocating movement of the push plate, thereby introducing hot air into the interior of the limestone pile while stirring the limestone pile, thereby further improving the heating efficiency of the limestone and the working efficiency of the preheater.

[0014] In a preferred embodiment, the heat-conducting part includes a stirring plate sleeved on the outer end of each rotating rod, the outer surface of the rotating rod is provided with a plurality of evenly distributed air outlets, and the air outlets penetrate through the outer surface of the rotating rod. The heat-conducting part also includes a plurality of heat-resistant mesh covers evenly fixed on the outer side of the stirring plate, and an empty space is left between the heat-resistant mesh cover and the stirring plate.

[0015] By providing a stirring plate fixed to the outside of the rotating lever, the accumulated limestone is stirred along with the rotation of the rotating lever, thereby improving the heating uniformity of the limestone. At the same time, the heat-resistant mesh cover fixed between the stirring plates can utilize the empty space between the heat-resistant mesh cover and the stirring plates, and better guide the hot air inside the rotating lever through the air outlet, thereby increasing the contact area between the limestone and the hot air and improving the preheating efficiency of the limestone.

[0016] As can be seen from the above, the middle gas guide device using a limestone rotary kiln preheater provided by the present invention has the following improvements and advantages compared with the prior art:

[0017] First, a diverter gas pipe structure connected to the feed pipe is provided on the basis of the traditional limestone rotary kiln preheater, so that a part of the hot gas generated when the rotary kiln is working is diverted into the interior of the heat-conducting annular pipe, and the heating rod is heated. The electric push rod drives the push plate to move back and forth, driving the heating rod to enter the interior of the feed pipe, and the unevenly distributed heating rods are used to preliminarily preheat and intercept the limestone falling from the feed pipe, so that the limestone fully contacts the heating rod and is heated before falling, and the limestone is preliminarily preheated, thereby improving the preheating efficiency of the traditional preheater for limestone.

[0018] Secondly, a diverter cover which is connected to the inside of the preheater is additionally provided on the basis of the preheater, so that a part of the hot air entering the preheater is diverted into the inside of the hollow rotating lever, and at the same time, the threaded rod which is additionally threadedly connected to the push plate can drive the rotating lever to rotate simultaneously with the reciprocating movement of the push plate, so as to cooperate with the stirring plate fixed on the outside of the rotating lever to stir the accumulated limestone while utilizing the empty space between the heat-resistant mesh cover and the stirring plate, and to better guide the hot air inside the rotating lever through the air outlet, so as to stir the limestone pile while introducing hot air into the inside of the limestone pile, thereby completing the secondary preheating of the limestone, and further improving the preheating efficiency of the traditional preheater for the limestone while increasing the contact area between the limestone and the hot air. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic diagram of the overall structure of a middle air guide device of a limestone rotary kiln preheater.

[0020] Figure 2 The present invention provides a cross-sectional view of the overall structure of a middle air guide device of a limestone rotary kiln preheater.

[0021] Figure 3 This is a cross-sectional view of the structure of the first preheating mechanism of the middle air guide device of the limestone rotary kiln preheater proposed by the present invention.

[0022] Figure 4 This is a schematic diagram of the heat-conducting annular tube structure of a middle air guide device of a limestone rotary kiln preheater proposed by the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of a pusher plate of a middle air guide device of a limestone rotary kiln preheater proposed by the present invention.

[0024] Figure 6 The present invention provides a cross-sectional view of the push plate structure of a central air guide device of a limestone rotary kiln preheater.

[0025] Figure 7 This is a cross-sectional view of the structure of the second preheating mechanism of the middle air guide device of the limestone rotary kiln preheater proposed by the present invention.

[0026] Figure 8 The present invention provides a side structural cross-sectional view of a rotating lever of a central air guide device of a limestone rotary kiln preheater.

[0027] Fig. 9 This is a schematic diagram of the operating state of a push plate of a limestone rotary kiln preheater proposed by the present invention.

[0028] Fig.10The present invention provides a schematic diagram of the internal structure of a distribution pipe of a limestone rotary kiln preheater when viewed from above.

[0029] In the figure: 1. material distribution pipe; 2. preheater; 3. material discharge pipe; 4. material pushing mechanism; 401. hydraulic push rod; 402. rotating arm; 403. material pushing plate; 5. first preheating mechanism; 501. distribution air pipe; 502. heat-conducting annular pipe; 503. square sleeve; 504. pushing plate; 505. electric push rod; 506. heating rod; 507. first air guide groove; 509. blocking mesh plate; 6. second preheating mechanism; 601. distribution cover; 602. rotating lever; 603. threaded rod; 604. chain belt; 605. second air guide groove; 606. heat-conducting part; 6061. stirring plate; 6062. air outlet; 6063. heat-resistant mesh cover; 6064. empty space; 607. threaded groove; 608. clamping part. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] The middle air guide device of a limestone rotary kiln preheater disclosed by the present invention is mainly used in the pre-work scenario of preheating a limestone pile when the limestone rotary kiln is working.

[0032] Reference Figures 1 to 10 , a middle air guide device of a limestone rotary kiln preheater, comprising a material distribution pipe 1, a preheater 2 connected to the bottom of the material distribution pipe 1, a material discharge pipe 3 connected to the bottom of the preheater 2, and a plurality of material pushing mechanisms 4 rotatably installed on the outside of the preheater 2, a first preheating mechanism 5 is arranged on the outside of the material distribution pipe 1 for preheating the limestone inside the material distribution pipe 1, the first preheating mechanism 5 comprises a shunt air pipe 501 connected to the top of the material discharge pipe 3, a heat-conducting annular pipe 502 is connected to the top of the shunt air pipe 501, and the heat-conducting annular pipe 502 is fixed to the top of the preheater 2 and distributed on the outside of the bottom of the material distribution pipe 1;

[0033] A second preheating mechanism 6 is provided inside the preheater 2 for preheating the limestone inside the preheater 2. The second preheating mechanism 6 includes a flow divider 601 fixed to the middle of the preheater 2. The flow divider 601 is connected to the inside of the preheater 2. A plurality of rotating levers 602 are evenly distributed on the outer surface of the flow divider 601. The rotating levers 602 are rotatably connected to the flow divider 601 and distributed inside the preheater 2.

[0034] Through the cooperation between the first preheating mechanism 5 and the second preheating mechanism 6, the limestone entering the distribution pipe 1 and the preheater 2 is preheated multiple times, thereby improving the preheating effect of the limestone.

[0035] In this embodiment, when in use, the operator connects the end of the feed pipe 3 to the rotary kiln, starts the entire device, and regularly transports limestone into the inside of the feed pipe 1 through an external conveying device. When the external rotary kiln is working, the high-temperature hot air generated will be introduced into the inside of the preheater 2 through the feed pipe 3. At the same time, the first preheating mechanism 5 started synchronously will divert part of the hot air entering the feed pipe 3 into the inside of the feed pipe 1, and the limestone falling from the inside of the feed pipe 1 will be intercepted by the first preheating mechanism 5. The limestone in the distribution pipe 1 is heated, and then lowered into the preheater 2 after heating. The second preheating mechanism 6 started at the same time will internally heat the limestone accumulated in the preheater 2. While heating, the limestone pile is stirred along with the operation of the first preheating mechanism 5, thereby further improving the preheating effect of the limestone. After the limestone in the preheater 2 completes the preheating operation, the pushing mechanism 4 is started to push the limestone accumulated at the bottom of the preheater 2 into the interior of the rotary kiln through the discharge pipe 3.

[0036] Among them, the pushing mechanism 4 includes a hydraulic push rod 401 obliquely installed on the outside of the preheater 2, a rotating arm 402 is rotatably installed on the outside of the preheater 2, and the output end of the hydraulic push rod 401 is rotatably installed on the rotating arm 402. At the same time, a pushing plate 403 is slidably installed inside the preheater 2, and the end of the pushing plate 403 passes through the outside of the preheater 2 and is connected to the rotating arm 402; the hydraulic push rod 401 is started, and the output shaft extends outward to push the rotating arm 402 to rotate, and the rotating rotating arm 402 will synchronously drive the pushing plate 403, causing the pushing plate 403 to slide along the inside of the preheater 2, thereby pushing the limestone material to be discharged; and the falling of the limestone material depends on the pushing frequency and speed of the pushing mechanism 4, so that the discharge speed and discharge amount can be controlled each time, ensuring that there is a gap between the limestone material and the discharge pipe 3 for gas flow.

[0037] Among them, the specific structure of the material distribution pipe 1 is referenced Figure 2 and Fig.10 Limestone enters from the feed port at the upper end of the distribution pipe 1 and is distributed to several distribution chambers to improve the preheating effect.

[0038] In the above scheme, in order to improve the preheating efficiency and uniformity of the limestone entering the preheater 2, it is necessary to perform an initial preheating treatment on the limestone entering the distribution pipe 1 in advance. The specific operation is as follows.

[0039] Reference Figures 1 to 6In a preferred embodiment, the first preheating mechanism 5 also includes a plurality of evenly distributed square sleeves 503 connected to the inner side of the heat-conducting annular tube 502, and each square sleeve 503 is slidably sleeved with a push plate 504 on the outer side, and the push plate 504 is an L-shaped structure. A plurality of evenly distributed electric push rods 505 are installed on the top of the heat-conducting annular tube 502, and the output end of each electric push rod 505 is fixedly connected to the side of a push plate 504, and a heating rod 506 is fixed to the side of each push plate 504. The number of heating rods 506 is several and irregularly distributed along the vertical direction. The heating rod 506 is slidably inserted into the interior of the distribution tube 1, and a first air guide groove 507 is opened inside each push plate 504 and the heating rod 506, and the first air guide groove 507 is connected to the interior of the heat-conducting annular tube 502 through the square sleeve 503.

[0040] In this embodiment: the hot air inside the discharge pipe 3 will radiate heat to the inside of the heat-conducting annular pipe 502 through the bypass air pipe 501, and introduce the heat into the inside of the heating rod 506 through the square sleeve 503 and the push plate 504 to heat the heating rod 506. At the same time, the electric push rod 505 is started synchronously, and the push plate 504 is pulled intermittently, causing the push plate 504 to reciprocate horizontally, and the heating rod 506 is driven to move synchronously at the same time. When the heating rod 506 is located inside the distribution pipe 1, the operator transports the limestone into the distribution pipe 1 through an external conveying device. The limestone entering the distribution pipe 1 will be intercepted by the push plate 504 and stay in the distribution area of ​​the heating rod 506, thereby directly contacting the heating rod 506 to complete the preliminary preheating of the limestone. Among them, a blocking mesh plate 509 is fixed at the connection between the bottom of the bypass air pipe 501 and the discharge pipe 3 to prevent the limestone from entering the inside of the bypass air pipe 501.

[0041] In the above scheme, in order to further improve the preheating efficiency and uniformity of the limestone in the preheater 2, the specific operations are as follows.

[0042] Reference Figures 2 to 3 , Figures 7 and 8 In a preferred embodiment, the second preheating mechanism 6 also includes a threaded rod 603 rotatably installed between the interior of the distribution pipe 1 and the heat-conducting annular tube 502 for transmitting a rotating lever 602. The number of threaded rods 603 is several and each threaded rod 603 is threadedly connected to the push plate 504. A second air guide groove 605 is opened inside each rotating lever 602, and the second air guide groove 605 is connected to the interior of the diverter cover 601. A heat-conducting portion 606 is provided at the outer end of each rotating lever 602 for transferring heat and stirring the accumulated limestone.

[0043] In this embodiment, a portion of the hot air entering the preheater 2 will be diverted into the interior of the diverter cover 601, and enter the interior of the rotating lever 602 through the second air guide groove 605, heating the rotating lever 602. At the same time, when the push plate 504 moves horizontally, the threaded rod 603 will be driven to rotate through the thread, and the rotating threaded rod 603 will synchronously drive the rotating lever 602 to rotate, so that the rotating lever 602 stirs the limestone pile while preheating the interior of the limestone pile. The bottom of each push plate 504 is penetrated by A thread groove 607 is penetrated, and the thread groove 607 is threadedly connected to the outer side of the threaded rod 603, and the threaded rod 603 is driven to rotate by the thread groove 607. At the same time, a chain belt 604 is connected with a transmission sleeve between each threaded rod 603 and the rotating lever 602, and the chain belt 604 is used to realize the transmission between the threaded rod 603 and the rotating lever 602. The chain belt 604 has a tensioning structure to ensure its transmission tightness, and the chain belt 604 is not located in the distribution pipe 1 and the preheater 2, and its position is located in the shell interlayer to avoid contact with limestone and affect its transmission effect.

[0044] Further, it is supplemented that: a clamping piece 608 is fixed to the end of each rotating lever 602 , and the clamping piece 608 is clamped on both sides of the splitter cover 601 to enhance the structural stability of the rotating lever 602 .

[0045] In the above scheme, in order to improve the working efficiency of the rotating lever 602 in stirring the limestone pile and better introduce the hot air inside the rotating lever 602 into the interior of the limestone pile, the specific operation is as follows.

[0046] Reference Figures 2 to 3 , Figures 7 and 8 In a preferred embodiment, the heat-conducting portion 606 includes a stirring plate 6061 sleeved on the outer end of each rotating lever 602, and the outer surface of the rotating lever 602 is provided with a plurality of evenly distributed air outlets 6062, and the air outlets 6062 penetrate through the outer surface of the rotating lever 602, and the heat-conducting portion 606 also includes a plurality of heat-resistant mesh covers 6063 evenly fixed on the outer side of the stirring plate 6061, and an empty space 6064 is left between the heat-resistant mesh cover 6063 and the stirring plate 6061.

[0047] In this embodiment: when the rotating lever 602 rotates, the rotating lever 602 will drive the stirring plate 6061 to rotate synchronously, thereby stirring the limestone pile. At the same time, the hot air inside the second air guide groove 605 will flow out from the inside of the rotating lever 602 through the air outlet 6062, and be distributed in the empty space 6064 between the heat-resistant mesh cover 6063 and the stirring plate 6061, thereby reserving enough space for the hot air to better preheat the limestone pile.

[0048] Among them, it is worth noting that: a portion of limestone is always accumulated in the preheater 2, and the pushing mechanism 4 pushes the preheated limestone on the bottom layer into the feeding pipe 3 at regular intervals, and when the pushing plate 504 moves intermittently, the rotating lever 602 also rotates intermittently, thereby stirring the limestone on the upper layer and improving the preheating effect.

[0049] Working principle: When in use, the operator connects the end of the feed pipe 3 to the rotary kiln and starts the whole equipment at the same time. The external rotary kiln will introduce the high-temperature hot air generated through the feed pipe 3 into the interior of the preheater 2 when working. The high-temperature hot air inside the feed pipe 3 will radiate heat to the inside of the split air pipe 501 and the heat-conducting annular pipe 502 by thermal radiation, and conduct it to the inside of the push plate 504 and the heating rod 506 through the square sleeve 503 to heat the heating rod 506. At the same time, the electric push rod 505 is started synchronously, intermittently pulling the push plate 504, causing the push plate 504 reciprocates in the horizontal direction, and at the same time drives the heating rod 506 to move synchronously. When the heating rod 506 is located inside the distribution pipe 1, the operator uses the screw feeder to transport the limestone from the silo into the distribution pipe 1. Since the push plate 504 has an L-shaped cross-section, the push plate 504 will seal the limestone in the distribution pipe 1. The limestone entering the distribution pipe 1 will first contact the heating rod 506 to complete the initial interception and preheating of the limestone. As the push plate 504 and the heating rod 506 are separated from the distribution pipe 1, the initially preheated limestone will fall out. The hot air entering the preheater 2 will gather upwards, and a part of it will be diverted into the inside of the diverter cover 601, and enter the inside of the rotating lever 602 through the second air guide groove 605, heating the rotating lever 602. At the same time, when the push plate 504 moves horizontally, the threaded rod 603 will be driven to rotate through the thread. The rotating threaded rod 603 will synchronously drive the rotating lever 602 to rotate through the chain belt 604. When the rotating lever 602 rotates, the rotating lever 602 will drive the stirring plate 6061 to rotate synchronously, thereby The limestone pile is stirred, and at the same time, the hot air inside the second air guide groove 605 will flow out from the inside of the rotating lever 602 through the air outlet 6062, and be distributed in the empty space 6064 between the heat-resistant mesh cover 6063 and the stirring plate 6061, thereby reserving enough space for the hot air to better preheat the limestone pile and complete the secondary preheating of the limestone; and after the limestone inside the preheater 2 completes the preheating operation, the pushing mechanism 4 is started, and the limestone accumulated at the bottom of the preheater 2 is pushed into the interior of the rotary kiln through the discharge pipe 3, completing the entire working process.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A middle gas guide device for a limestone rotary kiln preheater, comprising a material distribution pipe (1), a preheater (2) connected to the bottom of the material distribution pipe (1), a material discharge pipe (3) connected to the bottom of the preheater (2), and a plurality of material pushing mechanisms (4) rotatably mounted on the outside of the preheater (2), characterized in that: A first preheating mechanism (5) is arranged on the outside of the material distribution pipe (1) for preheating the limestone inside the material distribution pipe (1), the first preheating mechanism (5) comprising a branching air pipe (501) connected to the top of the material discharge pipe (3), the top of the branching air pipe (501) being connected to a heat-conducting annular pipe (502), the heat-conducting annular pipe (502) being fixed to the top of the preheater (2) and distributed on the outside of the bottom of the material distribution pipe (1); A second preheating mechanism (6) is arranged inside the preheater (2) for preheating the limestone inside the preheater (2), the second preheating mechanism (6) comprising a flow divider (601) fixed to the middle of the preheater (2), the flow divider (601) being connected to the inside of the preheater (2), a plurality of rotating levers (602) being evenly distributed on the outer surface of the flow divider (601), the rotating levers (602) being rotatably connected to the flow divider (601) and distributed inside the preheater (2); By means of the cooperation between the first preheating mechanism (5) and the second preheating mechanism (6), the limestone entering the distribution pipe (1) and the preheater (2) is preheated multiple times, thereby improving the preheating effect of the limestone.

2. The middle air guide device of a limestone rotary kiln preheater according to claim 1, characterized in that: The first preheating mechanism (5) further comprises a plurality of evenly distributed square sleeves (503) penetrating the inner side of the heat-conducting annular tube (502), a push plate (504) being slidably sleeved on the outer side of each of the square sleeves (503), the push plate (504) being an L-shaped structure, a plurality of evenly distributed electric push rods (505) being installed on the top of the heat-conducting annular tube (502), the output end of each of the electric push rods (505) being fixedly connected to a push plate (504). On the side, a heating rod (506) is fixed on the side of each pushing plate (504), and the number of the heating rods (506) is several and irregularly distributed along the vertical direction. The heating rod (506) is slidably inserted into the inside of the distribution pipe (1), and a first air guide groove (507) is opened inside each of the pushing plates (504) and the heating rod (506), and the first air guide groove (507) is connected to the inside of the heat-conducting annular tube (502) through the square sleeve (503).

3. The middle air guide device of a limestone rotary kiln preheater according to claim 2, characterized in that: The second preheating mechanism (6) also includes a threaded rod (603) rotatably installed between the interior of the distribution pipe (1) and the heat-conducting annular tube (502) for transmitting the rotating lever (602), the number of the threaded rods (603) being multiple and each of the threaded rods (603) being threadedly connected to the penetrating push plate (504), the interior of each of the rotating levers (602) being provided with a second air guide groove (605), the second air guide groove (605) being connected to the interior of the diverter hood (601), and the outer end of each of the rotating levers (602) being provided with a heat-conducting portion (606) for transferring heat and stirring the accumulated limestone.

4. The middle air guide device of a limestone rotary kiln preheater according to claim 3, characterized in that: The heat conducting part (606) comprises a stirring plate (6061) sleeved on the outer end of each rotating lever (602), and the outer surface of the rotating lever (602) is provided with a plurality of evenly distributed air outlets (6062), and the air outlets (6062) are penetrated and opened on the outer surface of the rotating lever (602).

5. The middle air guide device of a limestone rotary kiln preheater according to claim 4, characterized in that: The heat-conducting portion (606) further comprises a plurality of heat-resistant mesh covers (6063) uniformly fixed on the outside of the stirring plate (6061), and an empty space (6064) is left between the heat-resistant mesh covers (6063) and the stirring plate (6061).

6. The middle air guide device of a limestone rotary kiln preheater according to claim 2, characterized in that: The pushing mechanism (4) comprises a hydraulic push rod (401) obliquely mounted on the outside of the preheater (2); a rotating arm (402) is rotatably mounted on the outside of the preheater (2); an output end of the hydraulic push rod (401) is rotatably mounted on the rotating arm (402); and a pushing plate (403) is slidably mounted inside the preheater (2); an end of the pushing plate (403) passes through the outside of the preheater (2) and is connected to the rotating arm (402).

7. The middle air guide device of a limestone rotary kiln preheater according to claim 1, characterized in that: A blocking mesh plate (509) is fixed at the connection between the bottom of the diverter air pipe (501) and the feed pipe (3).

8. The middle air guide device of a limestone rotary kiln preheater according to claim 3, characterized in that: A thread groove (607) is formed through the bottom of each push plate (504), and the thread groove (607) is threadedly connected to the outer side of the threaded rod (603).

9. The middle air guide device of a limestone rotary kiln preheater according to claim 3, characterized in that: A chain belt (604) is transmission-sleeved between each of the threaded rods (603) and the rotating lever (602).

10. The middle air guide device of a limestone rotary kiln preheater according to claim 1, characterized in that: A clamping piece (608) is fixed to the end of each rotating lever (602), and the clamping piece (608) is clamped on two sides of the flow divider (601).

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