Necking opening of decomposing furnace of rotary cement kiln

Abstract

A rotary cement kiln decomposing furnace throat comprises a square-cone-shaped furnace wall on the upper portion, an inverted-square-cone-shaped furnace wall on the lower portion and a square-tube-shaped throat wall in the middle, at least two faces of the throat wall are provided with air volume adjusting devices, each air volume adjusting device comprises an adjusting part and a driving part, each adjusting part is provided with a rotatable adjusting blade, and each driving part drives the corresponding adjusting part to stretch out and draw back. The necking wall is provided with a plurality of adjusting holes for the air volume adjusting devices to stretch out and draw back, the adjusting holes correspond to the air volume adjusting devices one to one, and the adjusting holes are in clearance fit with the seal head and the seal bottom. The device is novel in conception and ingenious in design, and the air volume at the necking position can be fully adjusted under the condition that the necking structure is not greatly changed.

Description

Technical Field

[0001] The utility model belongs to the technical field of cement, in particular to a rotary kiln, in particular to a necking structure of a rotary kiln decomposition furnace. Background Art

[0002] Rotary kilns are commonly used calcining equipment, often used to calcine limestone in cement production. To enhance the efficiency of rotary kilns in calcining cement raw meal, they are often equipped with precalciners, which decompose the calcium carbonate before calcination. Within the precalciner, the cement raw meal powder is dispersed and suspended in the airflow, allowing the combustion of pulverized coal and the decomposition of calcium carbonate to be completed in a very short period of time.

[0003] In order to improve the uniform decomposition of calcium carbonate in the decomposition furnace and the sufficient and uniform heating of coal powder combustion, a constriction is usually set in the decomposition furnace. The constriction can reduce the flow area, thereby increasing the speed of airflow through the constriction, making the material more suspended and avoiding accumulation. It also accelerates the relative movement of gas and material, and the resulting sparging effect makes the temperature distribution in the furnace more uniform. However, since the coal powder and raw materials used are not completely consistent, and the ambient temperature is different, it is possible to affect the reaction state in the decomposition furnace, thereby causing problems such as material accumulation and crusting. It is necessary to adjust the constriction and adjust the upward air volume to meet the requirements. However, the constriction structure of existing decomposition furnaces is often a fixed structure, which is difficult to adjust. In the prior art, there are methods such as adjusting the outer wall of the constriction by springs to achieve the adjustment of the constriction size, such as the method disclosed in CN205718517U. Due to high temperature and sealing reasons, this solution cannot be applied in practice. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the utility model proposes a rotary kiln decomposition furnace necking, which adjusts the air flow rate at the necking by inserting an adjusting structure into the necking.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] A cement rotary kiln decomposition furnace necking is arranged in the decomposition furnace, including an upper square cone furnace wall, a lower inverted square cone furnace wall and a middle square tube necking wall, at least two sides of the necking wall are provided with an air volume regulating device, the air volume regulating device includes an regulating part and a driving part, the regulating part includes a head at the front end and a bottom at the end, the head and the bottom have the same appearance, a center rod with regulating leaves is provided between the head and the bottom, the front end of the center rod penetrates the head and is rotatably connected to it, and the other end penetrates the bottom and rotates with it, the driving part is connected to the end of the regulating part, drives the regulating part to extend and retract, the extension stroke is consistent with the distance between the head and the bottom, a plurality of regulating holes for the air volume regulating device to extend and retract are opened on the necking wall, the regulating holes correspond one-to-one with the air volume regulating devices, and the regulating holes are matched with the gap between the head and the bottom.

[0007] In the present invention, the adjustment holes provided on each of the necking walls include at least two rows, each row includes at least two adjustment holes, and the adjustment holes in the upper and lower rows are staggered.

[0008] Furthermore, each of the air volume regulating devices is independently controlled.

[0009] In the present invention, a guard is provided between the head and bottom of the regulating portion. Each air volume regulating device has two guards arranged opposite to each other, and the contours of the two guards are consistent with the appearance of the head and bottom.

[0010] Furthermore, the head and bottom seals are cylindrical, and the adjustment holes on the necking wall are circular holes.

[0011] Furthermore, the air volume regulating device is provided with a regulating device for regulating the rotation of the central rod, and the regulating blades are distributed on two opposite sides of the central rod.

[0012] In the present invention, the head is provided with an inwardly concave spherical groove, the edge of the spherical groove is provided with an annular sealing edge, the front end of the center rod is enlarged into a spherical shape, embedded in the spherical groove and rotated freely, and the outer diameter of the front end of the center rod is larger than the inner diameter of the spherical groove sealing edge to prevent the front end of the center rod from falling out of the head.

[0013] In the present invention, the driving portion of the air volume regulating device is provided with a driving device, and the driving device includes but is not limited to an electric push rod, an air pump, a hydraulic cylinder, and the like.

[0014] In the present invention, the adjusting device for adjusting the rotation of the central rod includes but is not limited to a handle, a stepping motor, etc.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The present invention adjusts the air flow area in the constriction by inserting and removing the air volume regulating device into and from the constriction of the decomposition furnace, thereby adjusting the air volume at the constriction.

[0017] The present application makes the adjustment of the air volume in the neck more refined by the air volume adjustment device by distributing the air volume adjustment device in a gradient and controlling it independently;

[0018] The air volume regulating device of the present application can further control the air circulation area in the necking by rotating the regulating blades, and further regulate the air volume in the necking.

[0019] Therefore, the utility model has a novel concept and an ingenious design, and can fully adjust the air volume at the necking without making significant changes to the necking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the distribution of regulating holes on the necking wall;

[0022] Figure 3 This is a top view of the necking portion of the present invention;

[0023] Figure 4 This is a schematic structural diagram of the air volume regulating device of the present utility model;

[0024] Figure 5 for Figure 4 Schematic diagram of the state after the middle regulating blade is rotated 90°.

[0025] In the figure: decomposition furnace 1, square cone furnace wall 2, inverted square cone furnace wall 3, necking wall 4, air volume adjustment device 5, adjustment hole 6, head 7, bottom cover 8, drive unit 9, adjustment device 10, center rod 11, adjustment blade 12, edge guard 13, spherical groove 14, edge seal 15. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby. Example

[0027] A cement rotary kiln decomposition furnace necking is arranged in the decomposition furnace 1, such as Figure 1 As shown, it includes an upper square cone furnace wall 2, a lower inverted square cone furnace wall 3 and a middle square tube type shrinking wall 4. The shrinking wall 4 has circular adjustment holes 6 on two opposite sides. Figure 2 In the embodiment, the regulating holes 6 opened on each constricted wall 4 include three rows, each row includes two regulating holes 6, the regulating holes 6 in the upper and lower rows are staggered, and each regulating hole 6 is penetrated by an air volume regulating device 5, such as Figure 3 As shown, each air volume regulating device 5 is independently controlled.

[0028] like Figure 4 and 5The air volume regulating device 5 shown includes an regulating part and a driving part 9. The regulating part includes a head 7 at the front end and a bottom cover 8 at the end end. The head 7 and the bottom cover 8 are cylindrical and have a clearance fit with the regulating hole 6. A center rod 11 with regulating leaves 12 is provided between the head 7 and the bottom cover 8. The front end of the center rod 11 penetrates the head 7 and is rotatably connected thereto, and the other end penetrates the bottom cover 8 and rotatably fits therewith. The driving part 9 is connected to the end of the regulating part to drive the regulating part to extend and retract. The extension stroke is from the head 7 being located in the regulating hole 6 to the bottom cover 8 being located in the regulating hole 6. A side guard 13 is provided between the head 7 and the bottom cover 8 of the regulating part. The side guard 13 is arc-shaped. Each air volume regulating device 5 has two side guards 13 arranged opposite to each other. The circle where the two side guards 13 are located is consistent with the shape of the head 7 and the bottom cover 8, and the diameter of the circle where the side guard 13 is located does not exceed the outer diameter of the head 7 and the bottom cover 8.

[0029] The air volume regulating device 5 is provided with a regulating device 10 for regulating the rotation of the central rod 11, such as Figure 5 As shown, the regulating leaves 12 are distributed on opposite sides of the center rod 11, the head 7 is provided with a concave spherical groove 14, the edge of the spherical groove 14 is provided with an annular sealing edge 15, the front end of the center rod 11 is enlarged into a spherical shape, embedded in the spherical groove 14 and rotated freely, and the outer diameter of the front end of the center rod 11 is larger than the inner diameter of the sealing edge 15 of the spherical groove 14. Example

[0030] A cement rotary kiln decomposition furnace necking is arranged in the decomposition furnace, including an upper square cone furnace wall, a lower inverted square cone furnace wall and a square tube-shaped necking wall in the middle. The necking wall has rectangular adjustment holes on at least two sides, and each rectangular adjustment hole is penetrated by an air volume adjustment device. The air volume adjustment device includes an adjustment part and a driving part. The adjustment part includes a head and a bottom cover. The head and the bottom cover are rectangular parallelepipeds and are gap-matched with the adjustment holes. A center rod with adjustment leaves is arranged between the head and the bottom cover. The front end of the center rod penetrates the head and is rotatably connected to it, and the other end penetrates the bottom cover and is rotatably matched with it. Two edge guards are arranged between the head and the bottom cover of the adjustment part. The arc edges are sheet-shaped and distributed on the left and right sides of the center rod and the adjustment leaves. The height of the arc edges is consistent with that of the head and the bottom cover.

[0031] The present invention is applied to a cement rotary kiln for pre-decomposition of raw materials. During operation, taking Example 1 as an example, if the maximum air volume is required, all the air volume regulating devices 5 are in a pulled-out state, at which time the sealing heads 7 of the air volume regulating devices 5 block the regulating holes 6, the air circulation area in the necking is maximized, and the air flow rate can be maximized; if the minimum air volume is required, all the air volume regulating devices 5 are in an inserted state, and the center rod 11 is rotated so that the regulating leaves 12 are in a horizontal state, at which time the bottom seals 8 of the air volume regulating devices 5 block the regulating holes 6, and under the cover of the regulating leaves 12, the air circulation area in the necking is minimized, and the air flow rate can be minimized; if a moderate and adjustable air volume is required, the air volume regulating devices 5 can be inserted layer by layer according to the gradient requirements, and the angle of the center rod 11 can be rotated during use for dynamic adjustment.

[0032] In summary, combined with the above structure and use process, it can be found that the utility model is novel in conception and ingenious in design, and can fully adjust the air volume at the necking without making significant changes to the necking structure.

Claims

1. A cement rotary kiln decomposition furnace necking, arranged in the decomposition furnace, comprising an upper square cone furnace wall, a lower inverted square cone furnace wall and a middle square tube necking wall, characterized in that: An air volume regulating device is provided on at least two sides of the necked wall. The air volume regulating device includes an regulating part and a driving part. The regulating part includes a head at the front end and a bottom cover at the end. The shapes of the head cover and the bottom cover are consistent. A center rod with regulating leaves is provided between the head cover and the bottom cover. The front end of the center rod penetrates into the head cover and is rotatably connected thereto, and the other end penetrates the bottom cover and rotatably cooperates therewith. The driving part is connected to the end of the regulating part to drive the regulating part to extend and retract. The extension stroke is consistent with the distance between the head cover and the bottom cover. A plurality of regulating holes for the air volume regulating device to extend and retract are provided on the necked wall. The regulating holes correspond one-to-one to the air volume regulating devices, and the regulating holes are matched with the gap between the head cover and the bottom cover.

2. The decomposition furnace necking according to claim 1, characterized in that: The adjustment holes provided on each of the necking walls include at least two rows, each row includes at least two adjustment holes, and the adjustment holes in the upper and lower rows are staggered.

3. The decomposition furnace necking according to claim 2, characterized in that: Each of the air volume regulating devices is controlled independently.

4. The decomposition furnace necking according to claim 1, characterized in that: A protective edge is provided between the head and bottom cover of the regulating portion. Each air volume regulating device has two protective edges arranged opposite to each other, and the contours of the two protective edges are consistent with the appearance of the head and bottom cover.

5. The decomposition furnace necking according to claim 3, characterized in that: The head and bottom seals are cylindrical, and the adjustment holes on the necking wall are circular holes.

6. The decomposition furnace necking according to claim 3, characterized in that: The air volume regulating device is provided with a regulating device for regulating the rotation of the central rod, and the regulating blades are distributed on two opposite sides of the central rod.

7. The decomposition furnace necking according to claim 1, characterized in that: The head is provided with a concave spherical groove, the edge of the spherical groove is provided with an annular sealing edge, the front end of the center rod is enlarged into a spherical shape, embedded in the spherical groove and rotated freely, and the outer diameter of the front end of the center rod is larger than the inner diameter of the spherical groove sealing edge.

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