LU103143B1 - material cooler - Google Patents

Abstract

The present invention relates to a material cooler 40, wherein the material cooler 40 has a support surface for the material to be cooled, wherein the material cooler 40 has an application side for introducing hot material onto the support surface and a discharge side for discharging the cooled material, wherein the material cooler 40 has at least a first cooling zone 41 and a second cooling zone 42, wherein the first cooling zone 41 is adjacent to the discharge side, wherein the first cooling zone 41 has an air supply 51, wherein the second cooling zone 42 is adjacent to the first cooling zone 41, characterized in that the second cooling zone 42 has a first water supply 52 for water at more than 100 °C, wherein the first water supply 52 is arranged below the support surface.

Description

222314P00LU 1/8 LU103143

material cooler

The invention relates to a material cooler with sealing of the oxygen-exposed warmer part against the ambient air in the colder part of the

material cooler.

Plants, for example for the production of clinker, are now operated using the so-called oxyfuel process, i.e. ideally in pure oxygen.

As a result, the gas at the end of the process is ideally carbon dioxide (with water vapor), which can be separated very easily and thus does not reduce the carbon dioxide concentration at the inlet of a downstream carbon dioxide separation device. This means that the carbon dioxide can be separated in a simple manner and thus an emission can be avoided. In particular, this eliminates the need for complex separation, especially of nitrogen. However, any source of secondary air, i.e. the possibility of ambient air entering the system, should be avoided as far as possible.

A common separation point between the oxygen-containing area and the

Ambient air is usually found in the material cooler, where cooling is possible at least at

end with ambient air.

From DE 10 2006 026 234 A1 a device and a method for cooling

Bulk goods known.

WO 2022 248 384 A1 discloses a method and a device for producing

cement clinker.

To avoid this, for example, separating or baffle plates are usually installed in the

Material coolers are used to minimize the gas flows between the different areas. However, this still leads to mixing and thus to

Loss of valuable oxygen and penetration of nitrogen into the

Indoors. Furthermore, such static devices are subject to wear and tear.

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The object of the invention is to prevent the entry of secondary air via the material cooler into the

system to minimize.

This object is achieved by the material cooler with the features specified in claim 1

Features. Advantageous further developments emerge from the subclaims, the following description and the drawings.

The material cooler according to the invention serves to cool a thermally treated

Material, in particular a bulk material, for example clinker. Preferably, the actual thermal treatment process is carried out according to the oxyfuel process, i.e. in an oxygen-rich atmosphere. The material cooler has a support surface for the material to be cooled. The material to be cooled moves through the material cooler on the support surface. This can be done actively by a conveyor or passively, for example by an inclined arrangement. The material cooler has a

Application side for applying hot material to the support surface and a

Discharge side for discharging the cooled material. The material cooler has at least a first cooling zone and a second cooling zone. The first cooling zone is adjacent to the discharge side. The cooled material is thus discharged from the first cooling zone. The first cooling zone has an air supply. For example, ambient air is preferably supplied via the air supply in order to cool the material so that it can be handled after removal from the material cooler.

A gas can also be supplied via the air supply, for example from a circuit. The gas supplied via the air supply usually contains a disturbing gas component, in particular nitrogen. The second cooling zone is connected to the first

Cooling zone adjacent. Thus, the second cooling zone is arranged along the material flow in front of the first cooling zone.

According to the invention, the second cooling zone has a first water supply for water at more than 100 °C. The first water supply is arranged below the support surface or in the material layer arranged on the support surface. The first water supply can be designed for liquid, hot water under pressure or for water vapor. A supply above 100 °C is effective in order to prevent condensation in the material. This is necessary, for example, in clinker, to ensure a

222314P00LU 3/8 LU103143 to prevent subsequent and unwanted reaction when storing the product.

Preferably, the water is supplied between 100 and 200 °C. Here the

The optimum choice is to be made between using the heat energy and avoiding condensation. Direct cooling of the material layer from above is known, for example by spraying water on it. The key to the invention, however, is the application of the water below or within the material layer, whereby a barrier effect is achieved in the material layer and not just above it.

An essential feature is the supply of water from below.

Application from above, for example by spraying. In all these cases, however, a gas layer remains within the material, which cannot be removed by

Water vapor is absorbed. By supplying it from below, the material layer is flowed through and thus an efficient gas barrier is created in this area as well.

In a further embodiment of the invention, the material cooler has a third

cooling zone. The third cooling zone is adjacent to the second cooling zone. The third

Cooling zone is designed for operation with enriched oxygen with a proportion of more than 50 vol.%, preferably more than 90 vol.%, oxygen, i.e. for the so-called

Oxyfuel process.

Alternatively, the oxygen-enriched atmosphere can also be created in a

material cooler and thus the device adjacent to the second cooling zone, for example a furnace head. In this case, the seal is made directly on the application side of the material cooler.

In a further embodiment of the invention, the second zone extends over at least 2%, preferably at least 3%, of the total length of the material cooler.

In a further embodiment of the invention, the second zone extends over at most 50%, preferably at most 35%, further preferably at most 20%, further preferably at most 10%, of the total length of the material cooler.

222314P00LU 4/8 LU103143

In a further embodiment of the invention, the material cooler has a third

cooling zone. The third cooling zone is adjacent to the second cooling zone. The third

Cooling zone is designed for operation with a mixture of carbon dioxide and oxygen, whereby the sum of oxygen and carbon dioxide is more than 80 vol.%. This also corresponds to the oxyfuel process, whereby additional carbon dioxide (mostly from the exhaust gas) is recycled. And so the gas flow is increased in order to replace the nitrogen missing in pure oxygen and thus increase the load-bearing capacity of the

gas flow comparable to conventional methods. For example, the ratio of oxygen to carbon dioxide can be set to 1:5, analogous to the oxygen content in the air, taking into account other

gas components.

In a further embodiment of the invention, the material cooler has a fourth

cooling zone. The fourth cooling zone is adjacent to the second cooling zone. The fourth

Cooling zone has a carbon dioxide supply. In particular, the carbon dioxide can be supplied to a calciner, for example, via a carbon dioxide outlet and a tertiary air line. Additionally or alternatively, the carbon dioxide outlet can be connected to the

Carbon dioxide supply, i.e. the carbon dioxide is recirculated. The

Carbon dioxide does not have to be pure carbon dioxide, but especially in the case of recirculated carbon dioxide, it can contain other substances.

In a further embodiment of the invention, the material cooler has a fifth

cooling zone. The fifth cooling zone is adjacent to the fourth cooling zone. The fifth

Cooling zone has a second water supply for water at more than 100 °C. The second water supply is arranged below the support surface or in the material layer arranged on the support surface. The second water supply can be designed for liquid water under pressure or for water vapor. A supply above 100 °C is effective in order to prevent condensation in the material. This is necessary, for example in the case of clinker, in order to prevent a subsequent and unwanted reaction when the product is stored. The water is preferably supplied between 200 and 400 °C. Since another cooling zone follows, water with a significantly higher temperature can be used here.

222314P00LU 5/8 LU103143

In a further embodiment of the invention, the material cooler has a seventh

cooling zone. The seventh cooling zone is adjacent to the fourth cooling zone. The seventh

Cooling zone is designed for operation with enriched oxygen with a proportion of more than 50 vol.%, preferably more than 90 vol.%, oxygen.

In a further embodiment of the invention, the material cooler has a sixth

cooling zone. The sixth cooling zone is adjacent to the fifth cooling zone. The sixth

Cooling zone is designed for operation with enriched oxygen with a proportion of more than 50 vol.%, preferably more than 90 vol.%, oxygen.

In a further embodiment of the invention, the third cooling zone has a

Gas outlet. The gas outlet is connected to the carbon dioxide supply and/or a calciner, in particular via a tertiary air line.

In a further embodiment of the invention, a first mechanical gas separation device is arranged between the first cooling zone and the second cooling zone. The first mechanical gas separation device preferably has a sufficient

Distance to the material on the support surface to prevent wear. Additional mechanical

Gas separation devices must be arranged.

It is of course possible to combine the embodiments according to the invention with separating or baffle plates according to the state of the art. This of course further reduces unwanted mixing.

The material cooler according to the invention is explained in more detail below using an embodiment shown in the drawings.

Fig. 1 first example

Fig. 2 second example

Fig. 3 third example

Fig. 4 fourth example

Fig. 5 fifth example

222314P00LU 6/8 LU103143

Fig. 6 sixth example

A first example is shown in Fig. 1. It is, for example, a plant for producing clinker from limestone. The plant has a preheater 10, a

Calciner 20, a rotary kiln 30 and a material cooler 40 according to the invention, wherein the material flow from the preheater 10 via the calciner 20 and the

rotary kiln 30 into the material cooler 40. The gas flow goes from

Rotary kiln 30 via the calciner 20 into the preheater. Rotary kiln 30, calciner 20 and preheater 10 are designed for operation according to the oxyfuel process, i.e. with (technically) pure oxygen and are operated in this way. The material cooler has a first cooling zone 41, which is supplied with cool

Ambient air is supplied and so the material, the named clinker, is kept close to the

To separate the oxygen-rich area from the

In order to separate the material cooler from the ambient air, the material cooler has a second cooling zone 42, into which pressurized water at, for example, 150 °C is fed from below via a first water supply 52, thereby ensuring a safe, simple and wear-free separation between the oxygen-rich area and the

ambient air is created.

In this respect, all examples discussed below are the same.

The first example has a direct oxygen supply into the rotary kiln 30, for example via the kiln head. Since the combustion takes place in (technically) pure

Since oxygen is very hot, preheating of the oxygen is not necessary.

Fig. 2 shows a second example where the oxygen is not fed directly into the rotary kiln 30, as in the first example, but is first fed via an oxygen supply 53 into a third cooling zone 43 and preheated there and preheated from the third

cooling zone 43 into the rotary kiln. The third cooling zone 43 is arranged directly adjacent to the second cooling zone 42.

In Fig. 3 a third example is shown in which a fourth cooling zone 44 is arranged adjacent to the second cooling zone 42. The fourth cooling zone 44 is supplied with a

222314P00LU 718 LU103143

Carbon dioxide supply 54 carbon dioxide is supplied. The oxygen is also supplied in the third

Example as in the first example directly fed to the rotary kiln 30.

The fourth example shown in Fig. 4 differs from the third example in that adjacent to the fourth cooling zone 44 there is a fifth cooling zone 45 with a second

Water supply 55 is arranged. This prevents the carbon dioxide from the fourth cooling zone 44 from entering the rotary kiln 30. Instead, the carbon dioxide is fed directly to the calciner 20 via a tertiary air line in order to achieve a larger

to generate volume flow and thus increase the load-bearing capacity of the material in the gas stream.

The fifth example shown in Fig. 5 differs from the third example in that a seventh cooling zone 47 is arranged adjacent to the fourth cooling zone 44, wherein the seventh cooling zone 47 is supplied with (technically) pure

Oxygen is supplied, preheated there and then fed to the rotary kiln 30. The carbon dioxide from the fourth cooling zone 44 is fed to the calciner 20 via a tertiary air line, as in the fourth example.

Fig. 6 shows a sixth example, which differs from the fourth example in that the material cooler 40 has a sixth cooling zone 46 adjacent to the fifth cooling zone 45, wherein the sixth cooling zone 46 is connected via a

Oxygen supply 56 is supplied with (technically) pure oxygen, where it is preheated and then fed to the rotary kiln 30.

Reference numerals 10 Preheater 20 Calciner

rotary kiln

Material cooler 30 41 first cooling zone 42 second cooling zone 43 third cooling zone 44 fourth cooling zone

222314P00LU 8/8 LU103143 45 fifth cooling zone 46 sixth cooling zone 47 seventh cooling zone 51 air supply 52 first water supply 53 oxygen supply 54 carbon dioxide supply 55 second water supply 56 oxygen supply 57 oxygen supply

Claims (9)

222314P00LU 1/2 LU103143 patent claims 1. Material cooler (40), wherein the material cooler (40) has a support surface for the material to be cooled, wherein the material cooler (40) has an application side for introducing hot material onto the support surface and a discharge side for discharging the cooled material, wherein the material cooler (40) has at least a first cooling zone (41) and a second cooling zone (42), wherein the first cooling zone (41) is adjacent to the discharge side, wherein the first cooling zone (41) has an air supply (51), wherein the second cooling zone (42) is adjacent to the first cooling zone (41), characterized in that the second cooling zone (42) has a first water supply (52) for water at more than 100 °C, wherein the first water supply (52) is arranged below the support surface or in the material layer arranged on the support surface. 2. Material cooler (40) according to claim 1, characterized in that the material cooler (40) has a third cooling zone (43), wherein the third cooling zone (43) is adjacent to the second cooling zone (42), wherein the third cooling zone (43) is designed for operation with enriched oxygen with a proportion of more than 50 vol. %, preferably more than 90 vol. %, of oxygen. 3. Material cooler (40) according to claim 1, characterized in that the material cooler (40) has a third cooling zone (43), wherein the third cooling zone (43) is adjacent to the second cooling zone (42), wherein the third cooling zone (43) is designed for operation with a mixture of carbon dioxide and oxygen, wherein the sum of oxygen and carbon dioxide is more than 80 vol.%. 4. Material cooler (40) according to claim 1, characterized in that the material cooler (40) has a fourth cooling zone (44), wherein the fourth cooling zone (44) is adjacent to the second cooling zone (42), wherein the fourth cooling zone (44) has a carbon dioxide supply (54). 5. Material cooler (40) according to claim 4, characterized in that the material cooler (40) has a fifth cooling zone (45), wherein the fifth cooling zone (45) is adjacent to the fourth cooling zone (44), wherein the fifth cooling zone (45) 222314P00LU 2/2 LU103143 has a second water supply (55) for water at more than 100 °C, wherein the second water supply (55) is arranged below the support surface or in the material layer arranged on the support surface. 6. Material cooler (40) according to claim 5, characterized in that the material cooler (40) has a seventh cooling zone (47), wherein the seventh cooling zone (47) is adjacent to the fourth cooling zone (44), wherein the seventh cooling zone (47) is designed for operation with enriched oxygen with a proportion of more than 50 vol.%, preferably more than 90 vol.%, of oxygen. 7. Material cooler (40) according to claim 5, characterized in that the material cooler (40) has a sixth cooling zone (46), wherein the sixth cooling zone (46) is adjacent to the fifth cooling zone (45), wherein the sixth cooling zone (46) is designed for operation with enriched oxygen with a proportion of more than 50 vol.%, preferably more than 90 vol.%, of oxygen. 8. Material cooler (40) according to one of claims 2 to 7, characterized in that the third cooling zone (43) has a gas outlet, wherein the gas outlet is connected to the carbon dioxide supply (54) and/or a calciner. 9. Material cooler (40) according to one of the preceding claims, characterized in that a first mechanical gas separation device is arranged between the first cooling zone (41) and the second cooling zone (42).