DE102010033307A1 - Apparatus and method for post-burning hot material on a conveyor - Google Patents

Abstract

Device (1) for conveying hot material (2) from at least one combustion boiler (3), comprising at least one conveyor (4) for conveying the hot material (2) from a material receiving area (5) of the at least one conveyor (4) to one Material delivery space (6) of the at least one conveyor (4) along a conveyor line (7) and at least one housing (13) surrounding the at least one conveyor (4), with at least one oxidizing agent supply along the conveyor line (7) at a distance from the material delivery space (6) (23) is arranged in or on at least one housing (13).

Description

The present invention relates to an apparatus and a method for conveying hot material with an afterburning of combustible material on a conveyor that transports combustion residues. The invention finds particular application in plants with at least one combustion boiler, for example. Installations for the combustion of fossil fuels and / or waste incineration plants.

When removing the ash, slag or combustion residues, hereinafter also referred to as "material", it is of particular importance, on the one hand achieved by cooling an achieved solidification or solidification of the hot, partially still melted materials, so that in particular a promotion or Further processing of these materials is possible after deduction from the combustion boiler. Moreover, it is also desirable to subject the hot material on the conveyor to afterburning to reduce unburned components of the hot material.

Previously, it was assumed that for a promotion of hot materials, a quench in the water bath is first required (so-called Naßaustragung). For this, however, large amounts of water were required, which were not readily available, especially in arid regions. In addition, the water used had to be cleaned consuming. Therefore, since the 1990s, people have gone to so-called dry exhaust systems. The hot material is placed on conveyor belts and transported there, with a targeted cooling of the hot material is carried out on the conveyor belt. These conveyor belts are performed regularly encapsulated in relation to the external environment, so have a housing which prevents even in the treatment of the material resulting combustion gases can easily escape into the environment. In addition, the combustion boilers are mainly operated with a slight negative pressure, so that the combustion gases produced by the material are drawn off by a corresponding suction to the combustion boiler.

In the latter devices for conveying hot material has been found that the post-combustion on the conveyor is often insufficient, so that at the end of the conveyor line, the material still has a high proportion of unburned components. As a result, the ash quality, in particular with regard to a degree of combustion of the hot material, is often insufficient for further processing of the hot material. This applies in particular to the further processing of the hot material in the construction industry.

The object of the invention is therefore to solve the technical problems described with reference to the prior art at least partially and in particular to provide a device for conveying hot material from at least one combustion boiler, characterized by an improved, in particular needs-based, goal-oriented and intelligent afterburning of the hot material. Furthermore, a method for conveying hot material from at least one combustion boiler is to be specified, which is characterized by an improved, in particular needs-based, goal-oriented and intelligent post-combustion of the hot material.

These objects are achieved with a device according to the features of patent claim 1 and a method according to the features of patent claim 5. Further advantageous embodiments of the invention are specified in the dependent formulated claims. It should be noted that the features listed individually in the dependent formulated claims can be combined with each other in any technologically meaningful manner and define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, wherein further preferred embodiments of the invention are shown.

The inventive device for conveying hot material from at least one combustion boiler has at least one conveyor for conveying the hot material from a material receiving area of the at least one conveyor to a material discharge space of the at least one conveyor along a conveyor path and at least one surrounding the at least one conveyor housing spaced apart from the material discharge space, at least one oxidant supply is arranged in or on the at least one housing along the conveying path.

The at least one conveyor is preferably designed in the manner of a steel plate conveyor, in which a plurality of steel plates are arranged overlapping one another articulated in series and are moved by (chain) drives or deflection rollers. In particular impact-resistant, corrosion-resistant and temperature-resistant steels come into consideration as material for the conveyor belt.

The at least one conveyor is surrounded by at least one housing. This at least one housing can in the region of the material receiving area of the at least one conveyor in particular be connected in a gas-tight manner to the combustion boiler, wherein then the material receiving area of the at least one conveyor is located below a material discharge opening of the combustion boiler. In the material receiving area, the hot material is applied to the at least one conveyor.

A post-combustion zone adjoins the material receiving area in a conveying direction of the hot material. In this post-combustion zone, afterburning of the hot material takes place by the addition of an oxidizing agent. This oxidizing agent is in particular (ambient) air, (ambient) air with modified oxygen content and / or pure oxygen and / or flue gas. For this purpose, at least one oxidant supply in or on the housing is arranged at a distance from the material discharge space or in the region of the post-combustion zone, with which the oxidizing agent can be introduced into the post-combustion zone and the oxidizing agent in the post-combustion zone can be brought into contact with the hot material. The at least one oxidant supply can be stationary and / or movable, in particular pivotable, in and / or attached to the at least one housing. Further, these guide elements, such as baffles, flow control means and / or fans, have. The post-combustion zone regularly extends from the material receiving area below the material discharge port of the combustion boiler to a region where the oxidizer causes substantially no post-combustion of the hot material. Depending on the flow conditions of the oxidizing agent in at least one housing, the afterburning zone ends, in particular in the conveying direction, immediately behind the (last) at least one oxidant feed.

The post-combustion zone is preferably followed by a cooling zone, in which the hot material on the at least one conveyor is cooled by a cooling air flow. In other words, this means that in the cooling zone, the cooling effect outweighs or even substantially no significant post-combustion occurs. This cooling air flow is essentially not the oxidizing agent supplied via the oxidant supply, but rather an additional cooling air flow, in particular in or near a material discharge space of the at least one conveyor, which is preferably controllable independently of the supply of the oxidizing agent. The oxidizing agent may moreover have a higher oxygen concentration than the cooling air flow reaching the afterburning zone. The cooling air flow enters the device either through a material discharge space of the at least one housing and / or through at least one separate cooling air flow inlet in the at least one housing in the material discharge space of the at least one conveyor.

• – in Förderrichtung (unmittelbar) hinter dem zumindest einen Förderband beginnt, also am Ende der Förderstrecke, und der von dem mindestens einen Gehäuse begrenzt wird, und/oder
• – in Förderrichtung mit einer Öffnung im mindestens einen Gehäuse beginnt, aus dem das heiße Material entladen wird, und der von dem mindestens einen Gehäuse begrenzt wird.

The material dispensing space is, in particular, that space within the at least one housing which

• - In the conveying direction (immediately) behind the at least one conveyor belt begins, ie at the end of the conveyor line, and which is bounded by the at least one housing, and / or
• - In the conveying direction begins with an opening in the at least one housing from which the hot material is discharged, and which is bounded by the at least one housing.

Accordingly, it is particularly preferred that the oxidant supply arranged closest to the material discharge space is still arranged in the lateral region of the conveyor or of the conveyor belt. Thus, in particular, it is ensured that the oxidizing agent is added to the material lying on the conveyor.

Both the oxidizing agent and the cooling air flow can flow substantially along the conveying path of the at least one conveyor and preferably counter to the conveying direction of the hot material, namely in the direction of the combustion boiler. In order to prevent the oxidant and / or the cooling air flow from fully or partially entering a combustion chamber of the combustion boiler, the oxidant may be at least partially and / or completely removed from the housing through an oxidant outlet prior to entering the combustion chamber of the combustion boiler the cooling air flow are at least partially or completely removed via a cooling air outlet. The Oxidationsmittelauslass is preferably arranged in the post-combustion zone and the cooling air outlet in the cooling zone. It should be clarified here that the cooling air outlet and the oxidant outlet can also be formed by a common outlet. It should also be noted at this point that the amount of oxygen entering the combustion chamber of the combustion boiler via the oxidant and / or the cooling air stream should not exceed 1.5 mass% of the oxygen needed for stoichiometric combustion in the combustion chamber.

The device according to the invention is now characterized by the fact that an afterburning can be carried out by a demand-oriented, goal-oriented and intelligent activation of an oxidant supply independently of a cooling air flow.

It should also be considered that the at least one oxidant supply and thus the afterburning zone is at least 1 meter, preferably at least 2 meters and more preferably at least 3 meters along the conveyor line spaced from the material discharge space of the at least one conveyor, so that a minimum length of the cooling zone is ensured. Furthermore, it is also advantageous if a first length of the post-combustion zone along the conveying path to a second length of the cooling zone along the conveying path is a ratio of 0.1 to 0.9, preferably 0.3 to 0.7 and particularly preferably substantially 0.5 is.

It when the at least one oxidant supply is connected to at least one hot air generator is particularly advantageous.

With the help of the hot air generator, the temperature of the oxidizing agent is increased. This increase in the temperature of the oxidizing agent leads to a particularly intensive afterburning of the hot material on the at least one conveyor in the post-combustion zone. The at least one oxidant supply is connected to the hot air generator in particular via temperature-resistant piping and / or hose lines. These pipelines and / or hose lines can have at least one oxidant pump. Basically, the oxidant is conveyed from one or more exhaust ducts of the combustion boiler and / or the environment and / or a secondary air stream intended for combusting fuels in the combustion boiler through the hot air generator and the oxidant supply into the enclosure. The temperature of the oxidizing agent is preferably increased by the hot air generator to at least 100 ° C, in particular to at least 200 ° C and most preferably to at least 300 ° C. In addition, it is preferable to raise the temperature of the oxidizing agent so that the temperature of the oxidizing agent is higher than the temperature of the cooling air stream when entering the post-combustion zone.

It is particularly advantageous if the device has at least one sensor for determining a characteristic value for a degree of combustion of the hot material.

In particular, this characteristic for the degree of combustion of the hot material may be at least one of the following group: the density of the hot material, the color of the hot material, the temperature of the hot material, the grain size of the hot material, the consistency of the hot Materials, the color temperature of the hot material, the radiant power of the hot material and the ultraviolet (UV) radiation of the hot material. The respective suitable characteristic value for a degree of combustion of the hot material depends decisively on the fuel used in the combustion boiler and can be easily determined by a person skilled in the art by means of routine investigations. Furthermore, depending on the characteristic value, a sensor known from the prior art is to be selected for determining the respective characteristic value. It should also be clarified that the degree of combustion is the already burned (percentage) mass fraction or the already burned (percentage) volume fraction of the hot material. In other words, by degree of combustion is meant the mass of the hot material minus the mass of unburned constituents of the hot material in percent or the volume of the hot material minus the volume of unburned constituents of the hot material in percent.

In a further development of the invention, it is proposed that the device has a control which is connected to the at least one sensor and the at least one oxidant supply in terms of data and which is set up to supply the at least one oxidant feed as a function of the characteristic value determined by the at least sensor for the degree of combustion to control the hot material as needed.

With this on-demand control of the at least one oxidant supply is meant in particular that the oxidant supply is controlled so that (only and / or exactly) so much oxidant is introduced into the post-combustion zone of the device that a desired degree of combustion of the hot material is achieved. In particular, a desired degree of combustion is a degree of combustion required for a particular post-processing of the hot material. In particular, a degree of combustion of at least 90%, preferably of at least 95% or even more preferably of at least 99% should be achieved. For this purpose, the control actuates in particular valves and / or oxidant pumps of the at least one oxidant supply.

• a) Bereitstellen von heißem Material aus dem zumindest einen Verbrennungskessel in einem Materialaufnahmebereich zumindest eines Förderers,
• b) Fördern des heißen Materials von dem Materialaufnahmebereich des zumindest einen Förderers zu einem Materialabgaberaum des zumindest einen Förderers entlang einer Förderstrecke,
• c) Nachverbrennen des heißen Materials auf dem zumindest einen Förderer durch bedarfsgerechte Zufuhr von Oxidationsmittel in zumindest ein Gehäuse des zumindest einen Förderers, wobei die Zufuhr des Oxidationsmittels in einen von dem Materialabgaberaum des zumindest einen Förderers beabstandeten Bereich des zumindest einen Gehäuses erfolgt, und
• d) Kühlen des heißen Materials durch einen zusätzlichen Kühlluftstrom zumindest im Materialabgaberaum des zumindest einen Förderers.

According to a further aspect of the invention, a method is also proposed for conveying hot material from at least one combustion boiler, comprising at least the following steps:

• a) providing hot material from the at least one combustion boiler in a material receiving area of at least one conveyor,
• b) conveying the hot material from the material receiving area of the at least one Conveyor to a material delivery space of the at least one conveyor along a conveyor line,
• c) post-burning the hot material on the at least one conveyor by supplying oxidant in at least one housing of the at least one conveyor as required, wherein the supply of the oxidant takes place in a region of the at least one housing spaced from the material discharge space of the at least one conveyor, and
• d) cooling the hot material by an additional cooling air flow at least in the material discharge space of the at least one conveyor.

According to step a), the hot material on the conveyor is fed onto the at least one conveyor, in particular through a material discharge opening of the combustion boiler in the material receiving area, which is arranged below the material delivery opening. Subsequently, in step b), the hot material is conveyed from the material receiving area of the at least one conveyor to the material discharge space of the at least one conveyor along the conveying path and unloaded from the housing in the material discharge space. The supply of the oxidizing agent according to step c) takes place in a region spaced from the material discharge region of the at least one conveyor, in particular a post-combustion zone, so that afterburning of the hot material on the at least one conveyor is assisted in this region. In addition, according to step d), the hot material is cooled by an additional cooling air flow at least in the material discharge space of the at least one conveyor, wherein the cooling of the hot material additionally in a cooling zone, extending from the post-combustion zone along the conveyor line to the material discharge of the at least one conveyor can extend. It should be clarified that the individual steps are carried out at least partially downstream of the at least one conveyor in parallel with time and / or during the conveyance of the hot material. Furthermore, all explanations and definitions of the features of the device are transferable to the corresponding features of the method and vice versa.

It is particularly advantageous if, in step c), the supply of the oxidizing agent is controlled according to a characteristic value for a degree of combustion of the hot material as required.

In particular, this characteristic for the degree of combustion of the hot material may be at least one of the following group: the density of the hot material, the color of the hot material, the temperature of the hot material, the grain size of the hot material, the consistency of the hot Materials, the color temperature of the hot material, the radiant power of the hot material and the ultraviolet (UV) radiation of the hot material. The respective suitable characteristic value for a degree of combustion of the hot material depends decisively on the fuel used in the combustion boiler and can be easily determined or calculated by a person skilled in the art by means of routine investigations. Furthermore, depending on the characteristic value, a sensor known from the prior art is to be selected for determining the respective characteristic value. The control of the supply of the oxidizing agent is carried out in such a manner that the supplied amount of the oxidizing agent is increased at too low degrees of combustion in order to increase an intensity of the afterburning until the degree of combustion of the hot material at least reaches a desired degree of combustion.

Furthermore, it is advantageous if the characteristic value of the degree of combustion of the hot material is determined with at least one sensor. This means, in particular, a continuous determination of the characteristic value for the degree of combustion of the hot material by a sensor suitable for the respective characteristic value, in particular in real time, so that a continuous control of the supply of the oxidizing agent adapted to the actual degree of combustion of the hot material can take place.

• – Temperatur des Oxidationsmittels,
• – Strömungsgeschwindigkeit des Oxidationsmittels,
• – Strömungsrichtung des Oxidationsmittels,
• – Massenstrom des Oxidationsmittels,
• – Sauerstoffkonzentration des Oxidationsmittels,
• – Zuführort des Oxidationsmittels in das Gehäuse.

It is also advantageous if the control of the supply of the oxidizing agent comprises at least influencing one of the following properties of the oxidizing agent:

• Temperature of the oxidizing agent,
• Flow rate of the oxidant,
• Flow direction of the oxidizing agent,
• Mass flow of the oxidizing agent,
• Oxygen concentration of the oxidizing agent,
• - Supply of the oxidant in the housing.

These properties of the oxidizing agent are particularly suitable for influencing the intensity of the afterburning on the at least one conveyor. In particular, it is preferred that at least two or even at least three of the aforementioned properties are influenced by the controller.

The temperature of the oxidizing agent is, in particular, that temperature which the oxidizing agent has on exiting from the at least one oxidant supply or when entering the at least one housing. The temperature of the oxidizing agent is preferably at least 100 ° C, in particular at least 200 ° C and most preferably at least 300 ° C. The temperature can in particular to the environmental conditions in the housing and / or on the Properties of the material adapted to be added in a controlled manner.

The flow rate of the oxidant is preferably at least 1 m / s (meters per second), more preferably at least 5 m / s and most preferably at least 10 m / s at the exit from the at least one oxidant supply or when entering the at least one housing. The flow rate can be controlled in particular adapted to the ambient conditions in the housing and / or to the properties of the material.

The flow direction of the oxidizing agent is, in particular, the direction of flow of the oxidizing agent along the conveying path in the at least one housing, that is to say either in the conveying direction and / or (partially) counter to the conveying direction of the hot material, and / or upon exit from the at least one oxidant feed or when entering the at least one housing. The flow direction can also be adjusted in particular to the ambient conditions in the housing and / or to the properties of the material.

The mass flow of the oxidant is that mass flow of the oxidant (in kilograms of oxidant per minute (kg / min)) that flows into the at least one housing through the at least one oxidant feed. The mass flow of the oxidizing agent is preferably at least 50 kg / min., In particular at least 100 kg / min. and most preferably at least 150 kg / min. The mass flow can in particular be added in a controlled manner to the ambient conditions in the housing and / or to the properties of the material.

The oxygen concentration of the oxidizing agent is, in particular, the oxygen concentration which the oxidizing agent has on discharge from the at least one oxidant supply or, when it enters the at least one housing, in mass percentage. In many cases, the oxygen concentration in about the same as in air, but this is not necessarily so maintain but it can be added to the ambient conditions in the housing and / or the properties of the material adapted (increased or decreased) oxygen concentration controlled.

The oxidant feed location into the housing is that location within the reburn zone in which the oxidant enters the housing from the at least one oxidant feed. Consequently, multiple feed locations may be provided. But it is also possible that a variable (eg, movable relative to the housing) Zufuhrort is present. The delivery of the oxidizing agent can thus also be adjusted with respect to the position relative to the housing and in dependence on ambient conditions in the housing and / or properties of the material.

Furthermore, it is advantageous if the addition of the oxidizing agent and the cooling are coordinated by the cooling air flow. In this way, it can be achieved, in particular, that the amount of oxygen entering the combustion chamber of the combustion boiler via the oxidizing agent and / or the cooling air flow does not exceed 1.5 mass% of the oxygen required for stoichiometric combustion in the combustion chamber.

The invention and the technical environment will be explained in more detail with reference to the figure. It should be noted that the figure shows a particularly preferred embodiment of the invention, but this is not limited thereto. It shows schematically:

1 : An embodiment of an inventive device for conveying hot material from at least one combustion boiler.

1 shows a device according to the invention 1 for conveying hot material 2 from at least one combustion boiler 3 , The device 1 has a sponsor 4 for conveying the hot material 2 from a material receiving area 5 to a material delivery room 6 along a conveyor line 7 on. The conveyor 4 is through a housing 13 surround. This case 13 is substantially gas tight over a material dispensing opening 14 with the combustion boiler 3 connected. Through the material dispensing opening 14 becomes the hot material 2 from a combustion chamber 15 of the combustion boiler 3 on the conveyor 4 in the material receiving area 5 given up.

The conveyor 4 is powered by a drive 22 driven so that the hot material 2 from the material receiving area 5 along the conveyor line 7 to the material delivery area 6 promoted and out of the housing 13 is delivered.

In the material delivery room 6 is a cooling air flow supply 29 arranged in the manner of a valve, pump, or fan, which has a cooling air flow 25 through a cooling airflow inlet 28 in the case 13 in the material delivery room 6 in the case 13 initiates. The cooling air flow 25 flows along the conveyor line 7 against the conveying direction of the hot material 2 through the housing 13 and cool the hot material 2 in a cooling zone 27 , The temperature of the cooling air flow 25 is at the end of the cooling zone 27 so high that at the end of the cooling zone 27 essentially no cooling of the hot material 2 more is done. The heated cooling air flow 25 is through a cooling air outlet 30 and / or an oxidant outlet 12 and / or through the material dispensing opening 14 out of the case 13 discharged. The cooling air outlet 30 is in this embodiment at the end of the cooling zone 27 ,

To the cooling air zone 27 closes against the conveying direction of the hot material 2 along the conveyor line 7 a post-combustion zone 26 at. In this post-combustion zone 26 is via an oxidant supply 23 an oxidizing agent 24 in the post-combustion zone 26 brought in. By the oxidizing agent 24 is the afterburning of the hot material 2 on the conveyor 4 in the post-combustion zone 26 promoted. To the oxidizing agent 24 in the post-combustion zone 26 Being able to provide on demand is within the device 1 (for example) a sensor 10 for determining a characteristic value for a degree of combustion of the hot material 2 arranged. This sensor 10 is with a controller 11 connected in terms of data, in turn, with an oxidizing agent 8th connected in a data-conducting manner in the manner of an oxidizing agent pump. The control 11 activates the oxidant pump 8th if the sensor 10 Characteristic values for a degree of combustion of the hot material 2 that is below a range for a desired level of combustion of the hot material 2 lie. For this purpose, the oxidant pump 8th via lines 16 with a hot air generator 9 connected. This hot gas generator 9 serves to increase the temperature of the oxidizing agent 24 , The oxidizing agent 24 becomes the hot gas generator 9 in this embodiment, from the combustion chamber 15 and / or exhaust leading areas 17 and / or the environment supplied. These are in the lines 16 a first valve 18 , a second valve 19 , a third valve 20 , a fourth valve 21 and a fifth valve 31 arranged to the oxidizing agent 24 to provide as needed.

In the present embodiment, the temperature of the oxidizing agent 24 through the hot air generator 9 , the flow direction of the oxidizing agent 24 through one along the conveyor line 7 and across the conveyor line 7 movable and / or pivotally configured oxidant supply 23 , the mass flow of the oxidant 24 through the cooling air flow supply 29 , the oxygen concentration of the oxidizing agent 24 about the place of removal of the oxidizing agent 23 (Combustion chamber 15 and / or exhaust leading areas 17 and / or the environment) and the feeding site of the oxidizing agent 24 by a movable embodiment of the oxidant supply 23 in the post-combustion zone 26 influenced.

The present invention is characterized in particular by an improved, in particular needs-based, goal-oriented and intelligent afterburning of the hot material.

LIST OF REFERENCE NUMBERS

1

contraption

2

hot material

3

combustion boiler

4

promoter

5

Material accommodation region

6

Material delivery room

7

conveyor line

8th

Oxidant conveyor

9

Hot air generators

10

sensor

11

control

12

oxidant

13

casing

14

Material dispensing opening

15

combustion chamber

16

management

17

Exhaust leading area

18

first valve

19

second valve

20

third valve

21

fourth valve

22

drive

23

Oxidant feed

24

oxidant

25

Cooling air flow

26

reburn

27

cooling zone

28

Cooling air inlet

29

Cooling air power

30

cooling air outlet

31

fifth valve

Claims (9)

Contraption ( 1 ) for conveying hot material ( 2 ) from at least one combustion boiler ( 3 ), comprising at least one conveyor ( 4 ) for conveying the hot material ( 2 ) of a material receiving area ( 5 ) of the at least one conveyor ( 4 ) to a material delivery room ( 6 ) of the at least one conveyor ( 4 ) along a conveyor line ( 7 ) and at least one of the at least one conveyor ( 4 ) surrounding housing ( 13 ), whereby along the conveyor line ( 7 ) spaced from the material discharge space ( 6 ) at least one oxidant supply ( 23 ) in or on at least one housing ( 13 ) is arranged. Contraption ( 1 ) according to claim 1, wherein the at least one oxidant supply ( 23 ) with at least one hot air generator ( 9 ) connected is. Contraption ( 1 ) according to one of the preceding claims, comprising at least one sensor ( 10 ) for determining a characteristic value for a degree of combustion of the hot material ( 2 ). Contraption ( 1 ) according to claim 3, comprising a controller ( 11 ), which conducts data with the at least one sensor ( 10 ) and the at least one oxidant feed ( 23 ) and which is adapted to receive the at least one oxidant feed ( 23 ) as a function of the at least one sensor ( 10 ) specific characteristic for the degree of combustion of the hot material ( 2 ) to control needs. Method for conveying hot material ( 2 ) from at least one combustion boiler ( 3 ), comprising at least the following steps: a) providing hot material ( 2 ) from the at least one combustion boiler ( 3 ) in a material receiving area ( 5 ) at least one conveyor ( 4 ), b) conveying the hot material ( 2 ) from the material receiving area ( 5 ) of the at least one conveyor ( 4 ) to a material delivery room ( 6 ) of the at least one conveyor ( 4 ) along a conveyor line ( 7 ), c) afterburning of the hot material ( 2 ) on the at least one conveyor ( 4 ) by appropriate supply of oxidizing agent ( 24 ) in at least one housing ( 13 ) of the at least one conveyor ( 4 ), wherein the supply of the oxidizing agent ( 24 ) into one of the material dispensing room ( 6 ) of the at least one conveyor ( 4 ) spaced portion of the at least one housing ( 13 ), and d) cooling the hot material ( 2 ) by an additional cooling air flow ( 25 ) at least in the material delivery room ( 6 ) of the at least one conveyor ( 4 ). Method according to claim 5, wherein in step c) the on-demand supply of the oxidizing agent ( 24 ) as a function of a characteristic value for a degree of combustion of the hot material ( 2 ) is controlled. Method according to claim 6, wherein the characteristic value for the degree of combustion of the hot material ( 2 ) with at least one sensor ( 10 ) is determined. Method according to one of the claims 6 or 7, wherein the control of the supply of the oxidizing agent ( 24 ) at least influencing one of the following properties of the oxidizing agent ( 24 ) comprises: temperature of the oxidizing agent ( 24 ), - flow rate of the oxidant ( 24 ), - flow direction of the oxidizing agent ( 24 ), - volume flow of the oxidizing agent ( 24 ), - mass flow of the oxidizing agent ( 24 ), - oxygen concentration of the oxidant ( 24 ), - Feeding point of the oxidizing agent ( 24 ) in the housing ( 13 ). Method according to one of claims 5 to 8, wherein the addition of the oxidizing agent ( 24 ) and the cooling by the cooling air flow ( 25 ) are coordinated.

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