Rotary kiln capable of improving heat exchange efficiency

Abstract

A rotary kiln capable of improving heat exchange efficiency comprises a rotary kiln body and is characterized in that a plurality of lifting plates are arranged in a kiln tail drying section of the rotary kiln body, the lifting plates are divided into vertical lifting plates and transverse lifting plates, the vertical lifting plates are rectangular lifting plates, and the transverse lifting plates are rectangular lifting plates. The vertical material raising plates are arc-shaped material raising plates, the vertical material raising plates are radially and vertically distributed on the cylinder wall of the rotary kiln in the axial direction of the rotary kiln, and the transverse material raising plates are arc-shaped material raising plates and are radially and vertically distributed on the cylinder wall of the rotary kiln in the direction perpendicular to the axial direction of the rotary kiln. Under the action of rotation and gravity of the rotary kiln, slurry fed into the kiln can be continuously lifted and thrown into the air to fall down by the vertical lifting plates, heat exchange water content of the slurry and flue gas is gradually reduced, and the slurry and the flue gas are gradually spherical; the transverse lifting plate plays a blocking role, and the slurry can climb over when accumulated to the height of the transverse lifting plate, so that the residence time of the slurry in the drying section is guaranteed, and the slurry is prevented from flowing into a high-temperature area too quickly.

Description

Technical Field

[0001] The utility model relates to the field of rotary kilns, in particular to a rotary kiln for improving heat exchange efficiency. Background Art

[0002] In the production of wet rotary kilns, slurry with a water content of 10 - 50% is fed into the kiln tail and gradually dried into balls at the kiln tail, and then flows to the high-temperature area at the kiln head for sintering reaction. The heat exchange efficiency and residence time in the drying section at the kiln tail determine the feed rate of the slurry and thus the output of the rotary kiln.

[0003] In the existing technical means, if the fed slurry fails to be dried into balls at the kiln tail, a large number of large blocks will be formed during the process of flowing to the high-temperature area at the kiln head, which is likely to block the feeding port of the rotary kiln and seriously affect production. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the defect in the existing technology that the feeding port of the rotary kiln is easily blocked, seriously affecting production, and provide a rotary kiln for improving heat exchange efficiency.

[0005] The technical solution adopted by the utility model to solve its technical problem is that a rotary kiln for improving heat exchange efficiency includes a rotary kiln body. Inside the drying section at the kiln tail of the rotary kiln body, a plurality of lifting plates are arranged. The lifting plates are divided into vertical lifting plates and horizontal lifting plates. The vertical lifting plates are rectangular lifting plates, and the vertical lifting plates are radially and perpendicularly distributed on the barrel wall of the rotary kiln along the axial direction of the rotary kiln. The horizontal lifting plates are arc-shaped lifting plates, and the horizontal lifting plates are radially and perpendicularly distributed on the barrel wall of the rotary kiln perpendicular to the axial direction of the rotary kiln.

[0006] Further, the length of the vertical lifting plate should be 1 / 6 - 1 / 3 of the diameter of the rotary kiln, and the height is 1 / 15 - 1 / 5 of the inner diameter of the rotary kiln.

[0007] Further, the arc length of the horizontal lifting plate is the corresponding length of the central angle of 20 - 45° of the rotary kiln, and the height is 1 / 15 - 1 / 5 of the inner diameter of the rotary kiln.

[0008] Further, a plurality of the vertical lifting plates enclose a circle inside the rotary kiln, and there are multiple circles inside the rotary kiln. The interval between each circle is 1 - 1.5 times the length of the vertical lifting plate, and each circle is arranged in a staggered manner.

[0009] Further, a plurality of the horizontal lifting plates enclose a circle inside the rotary kiln, and there are multiple circles inside the rotary kiln. The arrangement interval of each circle of horizontal lifting plates is 1 - 1.5 times the length of the vertical lifting plate, and each circle is arranged in a staggered manner.

[0010] Further, every 3 circles of vertical lifting plates are connected to 2 circles of horizontal lifting plates.

[0011] The utility model has the following beneficial technical effects:

[0012] The slurry fed into the kiln will be continuously lifted up and thrown into the air by circles of vertical lifting plates under the rotation of the rotary kiln and the action of gravity. The heat exchange between the slurry and the flue gas will gradually decrease and gradually become a ball. The horizontal lifting plates act as a barrier. The slurry can only be crossed over when it accumulates to the height of the horizontal lifting plates, which ensures the retention time of the slurry in the drying section and prevents the slurry from flowing into the high-temperature zone too quickly. Under the same heat condition, the drying efficiency is improved and the output is increased by 50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a vertical material lifting plate of a rotary kiln embodiment of the utility model for improving heat exchange efficiency;

[0014] Figure 2 It is a schematic diagram of a horizontal material lifting plate of an embodiment of a rotary kiln for improving heat exchange efficiency of the utility model;

[0015] Figure 3 It is an expanded view of an embodiment of a rotary kiln for improving heat exchange efficiency of the utility model.

[0016] Description of reference numerals:

[0017] 1. Vertical lifting board; 2. Horizontal lifting board. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] Reference Figures 1 to 3 The present embodiment includes a rotary kiln body, and a plurality of lifting plates are arranged inside the drying section at the kiln tail of the rotary kiln body, wherein the lifting plates are divided into a vertical lifting plate 1 and a horizontal lifting plate 2.

[0020] Specifically, the vertical lifting plate 1 is a rectangular lifting plate, and the vertical lifting plate 1 is radially and vertically distributed on the cylinder wall of the rotary kiln along the axial direction of the rotary kiln. The length of the vertical lifting plate 1 should be 1 / 6~1 / 3 of the diameter of the rotary kiln, and the height is 1 / 15~1 / 5 of the inner diameter of the rotary kiln. Multiple vertical lifting plates 1 form a circle inside the rotary kiln, and each circle of vertical lifting plates 1 is arranged with an average of 10-24 pieces, and the rotary kiln has a circle composed of vertical lifting plates 1 inside. At the same time, the interval of each circle is 1~1.5 times the length of the vertical lifting plate 1, and each circle is staggered with each other. In addition, the arrangement position of the vertical lifting plates 1 of the latter circle is the idle position of the lifting plates of the previous circle.

[0021] The transverse material lifting plate 2 is an arc-shaped material lifting plate, and the transverse material lifting plate 2 is radially and vertically distributed on the cylinder wall of the rotary kiln perpendicular to the axis direction of the rotary kiln. The arc length of the transverse material lifting plate 2 is the corresponding length of the central angle of the rotary kiln of 20° to 45°, and the height is 1 / 15 to 1 / 5 of the inner diameter of the rotary kiln. A plurality of transverse material lifting plates 2 are arranged in a circle inside the rotary kiln. On average, 4 to 9 pieces are arranged in each circle of the transverse material lifting plates 2, and there are a plurality of circles composed of the transverse material lifting plates 2 inside the rotary kiln. The interval between each circle is 1 to 1.5 times the length of the vertical material lifting plate 1, and each circle is arranged in a staggered manner. In addition, the arrangement position of the transverse material lifting plate 2 in the latter circle is the empty position of the material lifting plate in the previous circle.

[0022] In this embodiment, every 3 circles of vertical material lifting plates 1 are connected to 2 circles of transverse material lifting plates 2.

[0023] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Among them, the same parts are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific part. Therefore: All equivalent changes made according to the structure, shape and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A rotary kiln for improving heat exchange efficiency, comprising a rotary kiln body, characterized in that: A plurality of lifting plates are arranged inside the drying section at the kiln tail of the rotary kiln body. The lifting plates are divided into vertical lifting plates (1) and horizontal lifting plates (2). The vertical lifting plates (1) are rectangular lifting plates, and the vertical lifting plates (1) are vertically distributed on the cylinder wall of the rotary kiln along the axial direction of the rotary kiln. The horizontal lifting plates (2) are arc-shaped lifting plates, and the horizontal lifting plates (2) are vertically distributed on the cylinder wall of the rotary kiln along the radial direction perpendicular to the axial direction of the rotary kiln.

2. A rotary kiln for improving heat exchange efficiency according to claim 1, characterized in that: The length of the vertical lifting plate (1) should be 1 / 6 to 1 / 3 of the diameter of the rotary kiln, and the height should be 1 / 15 to 1 / 5 of the inner diameter of the rotary kiln.

3. A rotary kiln for improving heat exchange efficiency according to claim 1, characterized in that: The arc length of the transverse material lifting plate (2) is the length corresponding to the central angle of the rotary kiln of 20-45°, and the height is 1 / 15-1 / 5 of the inner diameter of the rotary kiln.

4. A rotary kiln for improving heat exchange efficiency according to claim 1, characterized in that: The plurality of vertical material lifting plates (1) form a circle inside the rotary kiln, and the rotary kiln has a plurality of circles inside, the interval between each circle is 1 to 1.5 times the length of the vertical material lifting plates (1), and each circle is staggered with respect to each other.

5. The rotary kiln for improving heat exchange efficiency according to claim 1, characterized in that: The plurality of transverse material lifting plates (2) are arranged in a circle inside the rotary kiln, and the rotary kiln has a plurality of circles inside. The arrangement interval of each circle of transverse material lifting plates (2) is 1 to 1.5 times the length of the vertical material lifting plates (1), and each circle is staggered with respect to each other.

6. A rotary kiln for improving heat exchange efficiency according to claim 1, characterized in that: Every three circles of vertical material lifting plates (1) are connected to two circles of horizontal material lifting plates (2).

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