Cement rotary kiln

Abstract

The utility model provides a cement rotary kiln, the outer wall organization of cylinder is equipped with heat recovery subassembly, the end of heat recovery subassembly is equipped with the connecting pipe, is equipped with the backflow pipe between connecting pipe and heating pipe, the high temperature flame of combustion device produces directly sprays into the heating pipe of the oblique setting, carries out the preliminary heating to the material in pipe. Material is sent into the cylinder of slow rotation and carries out the calcination through the feed pipe. The heat recovery subassembly of wrapping in the outer wall of cylinder is used for absorbing the waste heat of cylinder. The heated air gathers in the end of heat recovery subassembly, is guided back the heating pipe area through the connecting pipe and backflow pipe, is reused as the combustion-supporting wind or preheated air, thereby effectively promotes the thermal efficiency of whole system.

Description

Technical Field

[0001] This utility model relates to the field of cement production technology, and in particular to a cement rotary kiln. Background Technology

[0002] In cement production, the rotary kiln is a key thermal equipment, with its cylinder constantly subjected to high-temperature calcination. Traditional rotary kilns continuously lose a significant amount of heat to the surrounding environment from their cylinder surface, resulting in substantial energy waste, low thermal efficiency, and exacerbating the high-temperature working environment at the production site. While some waste heat recovery technologies are currently in use, they often suffer from problems such as complex structures, poor integration with the rotary kiln cylinder, limited recovery efficiency, or inconvenient maintenance. Therefore, this paper proposes a new type of cement rotary kiln. Utility Model Content

[0003] To address at least one of the aforementioned technical shortcomings, this utility model provides a cement rotary kiln, comprising: a combustion device, the heating end of which extends into the interior of a heating tube, a feed pipe connected to the end of the heating tube, a cylinder connected to the end of the feed pipe, a heat recovery assembly provided on the outer wall of the cylinder, a connecting pipe provided at the end of the heat recovery assembly, and a return pipe provided between the connecting pipe and the heating tube.

[0004] Furthermore, the heat recovery assembly is assembled from several arc-shaped plates. A support plate is integrally connected to the middle of the inner surface of the arc-shaped plates. The end face of the support plate is supported on the outer surface of the cylinder. Connecting steps are provided on the left edge of the outer surface and the right edge of the inner surface of the arc-shaped plates. The connecting steps between two adjacent arc-shaped plates are fixedly connected together. Several arc-shaped plates are arranged in a circular array on the outer surface of the cylinder to form a ring assembly. Several ring assemblies are connected end to end.

[0005] Furthermore, a fan is installed in the middle of the return pipe.

[0006] Furthermore, the curved panel is made of heat-insulating material.

[0007] Furthermore, the connecting pipe is connected to the end of the annular assembly, the end of the connecting pipe is closed, and the outer wall of the connecting pipe is provided with a connector for connecting to the return pipe.

[0008] Furthermore, the outer wall of the heating tube is provided with a connector for connecting to the return tube. Beneficial effects

[0009] The high-temperature flame generated by the combustion device is directly injected into the inclined heating tubes to preheat the material inside. The material is then fed into the slowly rotating cylinder through the feed pipe for calcination. A heat recovery assembly wrapped around the outer wall of the cylinder absorbs the waste heat emitted by the cylinder. The heated air is collected at the end of the heat recovery assembly and guided back to the heating tube area through connecting and return pipes, where it is reused as combustion air or preheated air, thereby effectively improving the thermal efficiency of the entire system.

[0010] The heat recovery assembly adopts a modular design, assembled from multiple arc-shaped plates. Each arc-shaped plate abuts against the outer wall of the cylinder via an integrally formed support plate on its inner side, forming an annular air channel. Connecting steps are machined along the edges of both arc-shaped plates; during installation, the connecting steps of adjacent arc-shaped plates interlock and are secured with bolts, thus forming a complete annular assembly around the cylinder. Multiple such annular assemblies are connected end-to-end along the cylinder's axial direction to collectively form a long-distance heat recovery system covering the calcination zone.

[0011] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Attached Figure Description

[0012] Figure 1 Axonometric view of the gasification device of this utility model Figure 1 .

[0013] Figure 2 Axonometric view of the gasification device of this utility model Figure 2 .

[0014] Figure 3 This is a line drawing diagram of the present invention taken on-site.

[0015] Figure 4 This is a schematic diagram of the heat recovery component structure of this utility model; Figure 5 This is a schematic diagram of the reflux pipe structure of this utility model; exist Figures 1 to 3 The correspondence between the component names or lines and the attached drawing numbers is as follows: Combustion device 1, Heating tube 2, Feed pipe 3, Return pipe 4, Cylinder 5, Heat recovery assembly 6, Arc plate 61, Connecting step 611, Support plate 62, Connecting pipe 7. Detailed Implementation

[0016] Please refer to Figures 1 to 3 ; This embodiment provides a cement rotary kiln, including: a combustion device 1, the heating end of the combustion device 1 extending into the interior of a heating tube 2, the end of the heating tube 2 being connected to a feed pipe 3, the end of the feed pipe 3 being connected to a cylinder 5, the outer wall of the cylinder 5 being provided with a heat recovery assembly 6, the end of the heat recovery assembly 6 being provided with a connecting pipe 7, and a return pipe 4 being provided between the connecting pipe 7 and the heating tube 2.

[0017] In practical implementation, the high-temperature flame generated by the combustion device 1 (such as a pulverized coal burner) is directly injected into the inclined heating tube 2 to preheat the material inside the tube. The material is then fed into the slowly rotating cylinder 5 via the feed pipe 3 for calcination. The heat recovery assembly 6, wrapped around the outer wall of the cylinder 5, absorbs the residual heat emitted by the cylinder. The heated air is collected at the end of the heat recovery assembly 6 and guided back to the heating tube 2 area via the connecting pipe 7 and the return pipe 4, where it is reused as combustion air or preheated air, thereby effectively improving the thermal efficiency of the entire system.

[0018] Furthermore, the heat recovery assembly 6 is assembled from several arc-shaped plates 61. A support plate 62 is integrally connected to the middle of the inner surface of the arc-shaped plate 61. The end face of the support plate 62 is supported on the outer surface of the cylinder 5. A connecting step 611 is provided on the left edge of the outer surface and the right edge of the inner surface of the arc-shaped plate 61. The connecting step 611 between two adjacent arc-shaped plates 61 is fixedly connected together. Several arc-shaped plates 61 are arranged in a circular array on the outer surface of the cylinder 5 to form an annular assembly. Several annular assemblies are connected end to end.

[0019] In practical implementation, the heat recovery assembly 6 adopts a modular design, assembled from multiple arc-shaped plates 61. Each arc-shaped plate 61 abuts against the outer wall of the cylinder 5 via an integrally formed support plate 62 on its inner side, forming an annular air channel. Connecting steps 611 are machined on both sides of the arc-shaped plates 61. During installation, the connecting steps 611 of adjacent arc-shaped plates 61 interlock and are fixed with bolts, thereby forming a complete annular assembly around the cylinder 5. Multiple such annular assemblies are connected end to end along the axial direction of the cylinder 5, together forming a long-distance heat recovery system covering the calcination area.

[0020] Furthermore, a fan is installed in the middle of the return pipe 4.

[0021] In practice, to overcome the airflow resistance in the pipe and ensure that the waste heat recovery airflow can stably return to the front end of the system, a fan is installed in the middle of the return pipe 4. The fan provides power to actively extract the hot air collected in the heat recovery assembly 6 and deliver it to the heating pipe 2.

[0022] Furthermore, the curved plate 61 is made of heat-insulating material.

[0023] In practical implementation, the arc-shaped plate 61 constituting the heat recovery assembly 6 is made of heat-insulating material (such as ceramic fiber or special heat-insulating steel). This material property can reduce the loss of heat from the inside of the heat recovery assembly 6 to the outside, retaining more heat in the recovery airflow; on the other hand, it can also protect the external support structure of the rotary kiln from the effects of high temperature.

[0024] Furthermore, the connecting pipe 7 is connected to the end of the annular assembly, the end of the connecting pipe 7 is closed, and the outer wall of the connecting pipe 7 is provided with a connector that connects to the return pipe 4.

[0025] In practice, a connecting pipe 7 is connected to the end of the annular assembly (usually at the lower end of the cylinder 5). The end of the connecting pipe 7 is closed, so that the hot air collected from the annular assembly can only flow to the connector on its side wall. The return pipe 4 is sealed to the connecting pipe 7 through this connector, thus venting the hot air out.

[0026] Furthermore, the outer wall of the heating tube 2 is provided with a connector that connects to the return tube 4.

[0027] In practice, a connector is also installed on the outer wall of the heating tube 2. The end of the return pipe 4 is connected to the inside of the heating tube 2 or its inlet air duct through this connector, so as to accurately send the recovered hot air back to the vicinity of the combustion device 1 for combustion assistance or material preheating, thus completing the recycling of heat.

[0028] During installation, the return pipe 4 needs to be avoided from the inlet of the feed pipe 3.

Claims

1. A cement rotary kiln, comprising: The combustion device (1) has a heating end that extends into the interior of the heating tube (2), and the end of the heating tube (2) is connected to a feed pipe (3), and the end of the feed pipe (3) is connected to a cylinder (5). The cylinder (5) is characterized in that: the outer wall of the cylinder (5) is provided with a heat recovery assembly (6), the end of the heat recovery assembly (6) is provided with a connecting pipe (7), and a return pipe (4) is provided between the connecting pipe (7) and the heating tube (2).

2. A cement rotary kiln according to claim 1, characterized in that: The heat recovery assembly (6) is assembled from several arc-shaped plates (61). A support plate (62) is integrally connected to the middle of the inner surface of the arc-shaped plate (61). The end face of the support plate (62) is supported on the outer surface of the cylinder (5). A connecting step (611) is provided on the left edge of the outer surface and the right edge of the inner surface of the arc-shaped plate (61). The connecting step (611) between two adjacent arc-shaped plates (61) is fixedly connected together. Several arc-shaped plates (61) are arranged in a circular array on the outer surface of the cylinder (5) to form a ring assembly. Several ring assemblies are connected end to end.

3. A cement rotary kiln according to claim 2, characterized in that: A fan is installed in the middle of the return pipe (4).

4. A cement rotary kiln according to claim 3, characterized in that: The curved plate (61) is made of heat-insulating material.

5. A cement rotary kiln according to claim 4, characterized in that: The connecting pipe (7) is connected to the end of the ring assembly. The end of the connecting pipe (7) is closed. The outer wall of the connecting pipe (7) is provided with a connector that connects to the return pipe (4).

6. A cement rotary kiln according to claim 5, characterized in that: The outer wall of the heating tube (2) is provided with a connector that connects to the return tube (4).

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