Single-chamber lime shaft kiln with center burner

Abstract

The utility model relates to a single-chamber lime shaft kiln with a central burner, and belongs to the technical field of kiln chamber structures of lime kilns. Comprising a furnace body (1) and a central burner (8), the outermost layer of the furnace body (1) is of a steel plate structure, the interior of the furnace body (1) is a lime kiln chamber built by refractory materials, the furnace body (1) is sequentially provided with a preheating section (3), a calcining section (6) and a cooling section (9) from top to bottom, an inner cavity of the preheating section (3) is of a straight barrel type structure, and inner cavities of the calcining section (6) and the cooling section (9) are of a big-end-down circular truncated cone type structure. And the central burner (8) is arranged at the central position of the bottom of the furnace body (1) and is of a thin circular truncated cone structure with a small upper part and a large lower part. The device has a simple structure, is convenient to manufacture, can reduce the formation of suspended materials of the lime kiln, prolongs the normal operation time of the lime kiln, can improve the yield of the lime kiln, ensures the good operation of the lime kiln, and improves the production benefit of the lime kiln.

Description

Technical Field

[0001] The utility model relates to a central burner single-chamber lime vertical kiln, belonging to the technical field of lime kiln chamber structures. Background Art

[0002] Lime kiln chambers come in a variety of shapes. Mechanized shaft kilns, beam-type kilns, and single-chamber lime shaft kilns with peripheral burners are all straight cylinders. Sleeve kilns are annular straight cylinders, and the calcining and preheating zones of double-chamber kilns are also straight cylinders. Mechanized shaft kilns and single-chamber lime shaft kilns with peripheral burners are all cylindrical straight cylinders, while beam-type kilns are rectangular straight cylinders. As limestone is calcined within the kiln, a small amount of viscous liquid forms on the surface of the limestone in the calcining zone. This causes adhesion between the limestone and the kiln walls. When the strength of the adhesion exceeds the weight of the material above the adhesion zone, the material cannot flow downward. As the kiln discharges ash, the lime below the adhesion zone is discharged, forming suspended material. This suspended material is detrimental to both the kiln's calcination process and the kiln chamber's refractory materials. Lime kilns with center burners hinder the downward movement of materials due to the presence of the center burner, resulting in a dead zone at the top of the center burner. The center burner and the dead zone form an arch foot of a hanging material arch. The arch foot has the function of supporting and holding up the hanging material arch. Therefore, lime kilns with center burners are more prone to hanging materials than lime kilns without center burners. To this end, it is necessary to design a center burner single-chamber lime shaft kiln. By improving the furnace structure, the lateral squeezing force between materials during downward movement is reduced, which is conducive to the downward movement of materials and avoids the phenomenon of hanging materials. Utility Model Content

[0003] The utility model aims to provide a central burner single-chamber lime shaft kiln, which improves the furnace structure and reduces the lateral squeezing force between materials when the materials descend, is conducive to the downward movement of materials, and avoids the phenomenon of suspended materials.

[0004] The technical solution of the utility model is: a central burner single-chamber lime shaft kiln, comprising a furnace body and a central burner, the outermost layer of the furnace body being a steel plate structure, the interior being a lime kiln chamber made of refractory materials, the furnace body being sequentially arranged from top to bottom into a preheating section, a calcining section, and a cooling section, the inner cavity of the preheating section being a straight cylindrical structure, the inner cavities of the calcining section and the cooling section being frustum-shaped structures that are small at the top and large at the bottom, the inner cavity diameter of the upper end face of the calcining section being the same as the inner cavity diameter of the preheating section, the inner cavity diameter of the upper end face of the cooling section being the same as the inner cavity diameter of the lower end face of the calcining section, a masonry inflection point I being generated at the junction of the preheating section and the calcining section, a masonry inflection point II being generated at the junction of the calcining section and the cooling section, the central burner being arranged at the bottom center of the furnace body, the central burner being a thin frustum-shaped structure that is small at the top and large at the bottom.

[0005] In the aforementioned center-burner single-chamber lime shaft kiln, the center burner has an upper end diameter of 300-1500 mm, a lower end diameter of 1000-4000 mm, and a height of 3000-7000 mm. A conical dead zone is formed within the furnace body above the center burner, with the apex of the dead zone located below masonry inflection point I on the furnace body centerline. The bottom disk of the dead zone serves as the top of the center burner. The cross-sectional area of ​​each calcining and cooling section, minus the cross-sectional area of ​​the dead zone or center burner within the kiln, is greater than the remaining cross-sectional area of ​​the layer above it. The apex of the dead zone is located 800-1200 mm below masonry inflection point I on the furnace body centerline.

[0006] In the central burner single-chamber lime shaft kiln as described above, the upper end surface of the central burner is 300-700 mm higher than the position of the masonry inflection point II.

[0007] In the central burner single-chamber lime shaft kiln as described above, the inner cavity diameter of the lower end face of the cooling section is 5000-8000 mm, the position of the masonry inflection point II is 3300-7700 mm away from the lower end face of the cooling section, the position of the masonry inflection point I is 10000-13000 mm away from the position of the masonry inflection point II, and the top of the furnace body is 9000-11000 mm away from the position of the masonry inflection point I.

[0008] The beneficial effects of the utility model are as follows: the device of the utility model has a simple structure and is easy to manufacture, can reduce the formation of suspended materials in the lime kiln, prolong the normal operation time of the lime kiln, can increase the output of the lime kiln, ensure the good operation of the lime kiln, improve the product quality of the lime kiln, and improve the production efficiency of the lime kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of the device of the utility model;

[0010] Figure 2 This is a cross-sectional view of the device along line AA of the present invention;

[0011] Figure 3 This is a BB cross-sectional view of the device of the utility model;

[0012] Figure 4 This is a cross-sectional view of the CC device of the present utility model;

[0013] Markings in the figure: furnace body 1, material surface height 2, preheating section 3, masonry inflection point I 4, dead material area 5, calcination section 6, masonry inflection point II 7, central burner 8, cooling section 9, preheating zone 10, calcination zone 11, cooling zone 12. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to examples with reference to the accompanying drawings.

[0015] Referring to the accompanying drawings, a central burner single-chamber lime shaft kiln includes a furnace body 1 and a central burner 8. The outermost layer of the furnace body 1 is a steel plate structure, and the interior is a lime kiln chamber made of refractory materials. The furnace body 1 is sequentially arranged from top to bottom with a preheating section 3, a calcining section 6, and a cooling section 9. The inner cavity of the preheating section 3 is a straight cylindrical structure, and the inner cavities of the calcining section 6 and the cooling section 9 are frustum-shaped structures that are small at the top and large at the bottom. The inner cavity diameter of the upper end face of the calcining section 6 is the same as the inner cavity diameter of the preheating section 3, and the inner cavity diameter of the upper end face of the cooling section 9 is the same as the inner cavity diameter of the lower end face of the calcining section 6. A masonry inflection point I4 is generated at the junction of the preheating section 3 and the calcining section 6. A masonry inflection point II7 is generated at the junction of the calcining section 6 and the cooling section 9. The central burner 8 is arranged at the bottom center of the furnace body 1. The central burner 8 is a thin frustum-shaped structure that is small at the top and large at the bottom. The center burner 8 has an upper diameter of 1000 mm, a lower diameter of 3000 mm, and a height of 6655 mm. A conical dead zone 5 is formed within the furnace body 1. The apex of the dead zone 5 is located 1000 mm below the masonry inflection point I4 on the centerline of the furnace body 1. The bottom disc of the dead zone 5 serves as the top of the center burner 8. The cross-sectional area of ​​each of the calcining sections 6 and cooling sections 9, minus the cross-sectional area of ​​the dead zone 5 or center burner 8 in the kiln, is greater than the remaining cross-sectional area of ​​the layer above it. The apex of the dead zone 5 is located 1000 mm below the masonry inflection point I4 on the centerline of the furnace body 1. The upper end face of the center burner 8 is 500 mm higher than the masonry inflection point II7. The inner cavity diameter of the lower end face of the cooling section 9 is 7000 mm, the position of the masonry inflection point II7 is 6200 mm away from the lower end face of the cooling section 9, the position of the masonry inflection point I4 is 12000 mm away from the position of the masonry inflection point II7, and the top of the furnace body 1 is 10000 mm away from the position of the masonry inflection point I4.

[0016] During production, according to the kiln temperature, the entire limestone is divided from top to bottom into a preheating zone 10, a calcining zone 11, and a cooling zone 12. The preheating section 3 of the kiln chamber is a cylindrical structure, and the limestone in the preheating zone 10 is heated from 20°C to 900°C. The calcining zone 11 is divided into three sections from top to bottom. The upper section of the calcining zone 11 is cylindrical, the middle section is frustum-shaped, and the lower section is frustum-shaped. The frustum angles of the middle and lower sections are different; the upper part of the calcining zone 11 is a cylindrical structure, and the limestone in the upper part of the calcining zone 11 continues to absorb heat and the temperature continues to rise, accompanied by the decomposition of the surface layer of the limestone; the middle and lower parts of the calcining zone 11 are frustum-shaped structures, and the frustum-shaped structure is small at the top and large at the bottom. The upper area is the same as the upper cylindrical area of ​​the calcining zone, and the lower effective area is (The area of ​​the cylinder circle minus the area of ​​the dead material zone at that location) is larger than the upper area; the kiln wall of the frustum structure is an inclined wall, and the angle between the inclined wall and the horizontal is less than 90°. An angle less than 90° does not form a support for the hanging material arch, and even if the molten limestone on the surface adheres to the wall, it is not easy to stick firmly under vertical force; the effective cross-sectional area of ​​each lower layer of the frustum structure of the calcining zone 11 is larger than the effective cross-sectional area of ​​the upper layer. When the material descends, the lateral extrusion force between the materials is small, which is conducive to the downward movement of the material. The cooling zone is a frustum structure, and its frustum structure extends from the lower frustum structure of the calcining zone. The effective cross-sectional area of ​​each lower layer of the frustum structure of the cooling zone 12 is larger than the cross-sectional area of ​​the upper layer. The effective area is conducive to the downward movement of the material.

[0017] The device of the utility model has a simple structure and is easy to manufacture, can reduce the formation of suspended materials in the lime kiln, prolong the normal operation time of the lime kiln, increase the output of the lime kiln, ensure the good operation of the lime kiln, improve the product quality of the lime kiln, and improve the production efficiency of the lime kiln.

Claims

1. A central burner single-chamber lime shaft kiln, characterized by The invention comprises a furnace body (1) and a central burner (8). The outermost layer of the furnace body (1) is a steel plate structure, and the interior is a lime kiln chamber made of refractory materials. The furnace body (1) is sequentially arranged from top to bottom as a preheating section (3), a calcining section (6), and a cooling section (9). The inner cavity of the preheating section (3) is a straight cylindrical structure. The inner cavities of the calcining section (6) and the cooling section (9) are truncated cone structures with a small upper portion and a large lower portion. The inner cavity diameter of the upper end surface of the calcining section (6) is the same as that of the preheating section (3). The inner cavity diameters of the sections (3) are the same, the inner cavity diameter of the upper end surface of the cooling section (9) is the same as the inner cavity diameter of the lower end surface of the calcining section (6), the connection between the preheating section (3) and the calcining section (6) produces a masonry inflection point I (4), the connection between the calcining section (6) and the cooling section (9) produces a masonry inflection point II (7), the central burner (8) is arranged at the bottom center of the furnace body (1), and the central burner (8) is a thin frustum-shaped structure with a small upper part and a large lower part.

2. The central burner single-chamber lime shaft kiln according to claim 1, characterized in that The central burner (8) has an upper end face diameter of 300-1500 mm, a lower end face diameter of 1000-4000 mm, and a height of 3000-7000 mm.

3. The central burner single-chamber lime shaft kiln according to claim 1, characterized in that The upper end surface of the central burner (8) is 300-700 mm higher than the position of the masonry inflection point II (7).

4. The central burner single-chamber lime shaft kiln according to claim 1, characterized in that The inner cavity diameter of the lower end face of the cooling section (9) is 5000-8000 mm, the distance between the position of the masonry inflection point II (7) and the lower end face of the cooling section (9) is 3300-7700 mm, the distance between the position of the masonry inflection point I (4) and the position of the masonry inflection point II (7) is 10000-13000 mm, and the distance between the top of the furnace body (1) and the position of the masonry inflection point I (4) is 9000-11000 mm.

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