Cooling device for cooling a hot particulate material

Abstract

A description of a cooling device (1) for cooling hot particulate material undergoing heat treatment in an industrial furnace, such as a rotary kiln (3) for the production of cement clinker, is presented. The cooling device (1) comprises a grate (21) for receiving and retaining hot material from the furnace, at least one cooling gas line (28) connected to slots (20) in the grate (21) for introducing cooling gases into the hot material (2), and a compressed air system (25, 26) for blowing compressed air into the material on the grate (21). The cooling device is characterized in that it includes flow restrictors (31) provided in the cooling gas line (28). This ensures, without the use of mechanically movable components, that only a very limited proportion of the compressed air blown into the material on the grate can flow through the cooling gas system.This is due to the fact that, as a result of the pressure conditions prevailing directly under the grate when compressed air is blown in, the flow restrictor acts as a backflow preventer, essentially preventing the passage of compressed air through the cooling gas line.

Description

[0001] The present invention relates to a cooling device for cooling hot, particulate material that has undergone heat treatment in an industrial furnace, such as a rotary kiln for the production of cement clinker, wherein the cooling device comprises a grate for receiving and holding hot material from the furnace, at least one cooling gas line connected to slots in the grate for introducing cooling gases into the hot material, and a compressed air system for blowing compressed air into the material on the grate.

[0002] A cooling device of the type described above is known from EP 1774236, wherein compressed air from a separate system can be blown intermittently into the material on the grate, with the aim of removing any agglomerates and so-called "snowman" formations formed by clumping of the clinker material, which reduce the efficiency of the cooling device, and wherein the line for cooling gases is closed by the use of a suitable valve system, e.g., in the form of a rotary flap, when compressed air is blown in. The disadvantage of this known cooling device is that the valve assembly is a mechanically moving component that can wear out relatively quickly when exposed to expanding compressed air, resulting in corresponding operational problems.

[0003] The objective of the present invention is to provide a cooling device for cooling hot particulate material, in which the aforementioned disadvantage is eliminated.

[0004] This is achieved by a cooling device as mentioned in the introduction, which is characterized by the fact that it includes flow limiting means provided in the cooling gas line.

[0005] This achieves, without the use of mechanically moving components, that only a very limited proportion of the compressed air blown into the material on the grate can flow through the cooling gas device. This is due to the fact that, as a result of the pressure conditions prevailing directly beneath the grate when compressed air is blown in, the flow restrictor acts as a backflow preventer, essentially preventing the passage of compressed air through the cooling gas line.

[0006] The flow restrictor can, in principle, be designed and arranged in any suitable way. It can therefore comprise plates, discs, or similar elements that are inserted into the cooling gas line, either transversely or at an angle to it. For example, the device can be inserted centrally into the cooling gas line and / or attached to the wall of the cooling gas line, and it can consist of several elements staggered relative to each other along the length of the cooling gas line.

[0007] The means are essentially stationary, but may be at least partially movable, for example by being made entirely or partially of an elastic material or by possibly including spring-loaded parts, so that the movable part(s) of the means follow the gas flow in the cooling gas line, which results in the flow area in the cooling gas line being reduced or increased depending on whether compressed air is blown in or not.

[0008] In principle, compressed air can be blown into the material on the grate in any suitable manner. However, it is preferred that the compressed air be blown in over the grate either through a separate channel or through the cooling gas line. If the compressed air is blown in through the cooling gas line, it is preferred that it be blown into the cooling gas line with a velocity component that runs parallel to the centerline of the cooling gas line and points towards the grate, which means that the compressed air must be blown in at an angle α of less than 90° relative to the centerline of the cooling gas line. In this embodiment, the compressed air is preferably blown in at an angle α of 0° relative to the centerline of the cooling gas line.In this embodiment of the invention, it is also possible for compressed air to be blown into the material through other lines or pipes, with the compressed air being simultaneously blown into the cooling gas line to generate the static pressure between the cooling grate and the material bed that is necessary to ensure that snowman formations and other larger clumps of material are lifted from the grate.

[0009] The invention will now be described in more detail with reference to the schematic drawings, wherein

[0010] Fig. 1 shows a side view of a cooling device according to the invention, and

[0011] Fig. 2, Fig. 3 and Fig. Four different embodiments of the cooling device according to the invention are shown.

[0012] In Fig. 1 is a cooling device 1 to see, directly adjacent to a rotary kiln 3It is installed for the production of cement clinker. The cooling device includes an inlet end. 4 and an omission 5 The cooling device shown also includes a fixed grate. 11 A blower is used to hold or carry the cement clinker. 12 for blowing cooling gases upwards through the clinker via a chamber 13 and, not shown in detail, slots in the inlet grate 11 , as well as a number of scraping elements 14 , which can be moved back and forth in the longitudinal direction of the cooling device by means of a drive mechanism not shown, so that the clinker is moved from the inlet end of the cooling device to the outlet end.

[0013] The cooling device shown also includes an inlet grate. 21 , which is located at the entrance 4 the cooling device is located directly below the outlet end of the rotary kiln, for receiving the hot cement clinker2 The design features of the inlet grate are outside the scope of protection of the present invention and can, in principle, be designed in any suitable way. The inlet grate 21 The one shown as an example is stepped and consists of several rust elements or rust shoes. 22 manufactured. The inlet grate is mounted at a specific inclination relative to the horizontal plane to facilitate the movement of the clinker through the cooling device. The cooling device also includes a fan in the inlet area. 23 for blowing cooling gas through the clinker via a chamber 24 , cooling gas lines 28 and slots 20 in the inlet grate 22 , as well as a separate compressed air system, which includes a compressed air tank 25 and a number of pipes 26 for blowing compressed air into the material on the inlet grate. The pressure tank 25In an alternative embodiment, it can be replaced by a blower.

[0014] According to the present invention, the cooling device comprises flow restrictors. 31 , which are in the cooling gas line 28 are designed so that only a very limited proportion of the compressed air blown into the material on the grate can escape downwards through the cooling gas line.

[0015] Fig. 2 to Fig. Figure 4 shows three non-limiting examples of the configuration and position of the flow restrictors. 31 .

[0016] In the Fig. In the embodiment shown in 2, the flow limiting means are provided by plates. 31 formed, alternating on opposite walls of the cooling gas line 28 are attached and at an angle relative to the cooling gas line 28 are positioned so that they form an offset flow path between each other.

[0017] In the Fig. In the embodiment shown in 2, the flow limiting means are provided by plates. 31 formed, which, using means not shown in detail, are inserted into the middle of the cooling gas line 28 are installed and relative to each other in the longitudinal direction of the cooling gas line 28 are staggered.

[0018] In the Fig. In the embodiment shown in section 4, the flow limiting means are provided by a plate. 31 formed, which is designed with a centrally located hole and is attached to the wall of the cooling gas line 28 is attached. In the embodiment shown, the plate comprises 31 further an inner movable part 32 , which is made of an elastic material and allows the gas flow in the cooling gas line 28This results in the flow area in the cooling gas line being reduced when compressed air is injected and increased when no compressed air is injected. In the Fig. In the embodiment shown in section 4, compressed air is carried through the line. 26 directly into the cooling gas line 28 at one point after the plate 31 and the moving part 32 blown in.

[0019] Compressed air can also be blown into the material on the grate via other lines or pipes not shown, while at the same time compressed air is blown through the line 26 is blown in to reduce the static pressure between the cooling grate 21 and the material bed 2 to create the material required to temporarily lift the material from the rust. Summary

[0020] A description of a cooling device ( 1) for cooling hot particulate material undergoing heat treatment in an industrial furnace such as a rotary kiln ( 3 ) was subjected to the production of cement clinker, whereby the cooling device ( 1 ) a rust ( 21 ) for receiving and holding hot material from the oven, at least one cooling gas line ( 28 ), which have slots ( 20 ) in the rust ( 21 ) is connected to introduce cooling gases into the hot material ( 2 ) to initiate, and a compressed air system ( 25 , 26 ) for blowing compressed air into the material on the grate ( 21 ) includes. The cooling device is characterized in that it includes flow restricting means ( 31 ) includes those in the cooling gas line ( 28 are planned.

[0021] This achieves, without the use of mechanically moving components, that only a very limited proportion of the compressed air blown into the material on the grate can flow through the cooling gas device. This is due to the fact that, as a result of the pressure conditions prevailing directly beneath the grate when compressed air is blown in, the flow restrictor acts as a backflow preventer, essentially preventing the passage of compressed air through the cooling gas line. QUOTES INCLUDED IN THE DESCRIPTION

[0022] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0023] EP 1774236

[0002]

Claims

[1] cooling device ( 1 ) for cooling hot particulate material undergoing heat treatment in an industrial furnace such as a rotary kiln ( 3 ) for the production of cement clinker, wherein the cooling device ( 1 ) a grate ( 21 ) for receiving and holding hot material from the furnace, at least one cooling gas line ( 28 ), those with slits ( 20 ) in the grate ( 21 ) is connected to inject cooling gases into the hot material ( 2 ) to be introduced, and a compressed air system ( 25 , 26 ) for blowing compressed air into the material on the grate ( 21 ) includes, characterized that they have flow restricting means ( 31 ) included in the cooling gas line ( 28 ) are provided. [2] Cooling device according to claim 1, characterized in that the flow restricting means ( 31 ) includes plates, discs or similar elements. [3] Cooling device according to claim 1, characterized in that the flow restricting means ( 31 ) into the cooling gas line ( 28 ) is inserted either transversely or at an angle to it. [4] Cooling device according to claim 1, characterized in that the flow restricting means ( 31 ) in the middle of the cooling gas line ( 28 ) is inserted and / or on the wall of the cooling gas line ( 28 ) is attached. [5] Cooling device according to claim 1, characterized in that the flow restricting means ( 31 ) is formed by several elements arranged in the longitudinal direction of the cooling gas line ( 28 ) are offset to each other. [6] Cooling device according to claim 1, characterized in that the flow restricting means ( 31 ) is stationary. [7] Cooling device according to claim 1, characterized in that the flow restricting means ( 31 ) a moving part ( 32 ) includes. [8] Cooling device according to claim 7, characterized in that the movable part ( 32 ) is made entirely or partly of an elastic material or includes spring-loaded parts. [9] Cooling device according to claim 1, characterized in that the compressed air via the grate either through a separate line ( 26 ) or through the cooling gas line ( 28 ) is blown in. [10] Cooling device according to claim 9, characterized in that the compressed air in the cooling gas line ( 28 ) is injected with a velocity component parallel to the center line of the cooling gas line ( 28 ) is and towards the grate ( 21 ) points.

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