METHOD FOR OPERATING A PLANT FOR THE PRODUCTION AND / OR HANDLING OF CEMENT CLINKER

Description

[0001] The invention relates to a method for operating a plant for producing and / or handling cement clinker. The invention also relates to a plant for producing and / or handling cement from cement clinker, sulfate carrier, and additives. The method and plant are used in particular for producing cement clinker and cement for use as aerated concrete and air-entrained concrete.

[0002] Aerated concrete and those with a higher proportion of air pores are typically used to produce masonry units or prefabricated components, or even ready-mixed concrete. They are characterized by a lower density compared to standard concrete without pore-forming agents, due to the desired increased number of pores or increased pore volume, or both. The relatively large pores and the additional pores have a positive influence on workability, frost resistance, segregation, and durability against sulfate-rich solutions, preventing, for example, shrinkage or cracking in the concrete.

[0003] The production of cement for use as aerated concrete or concrete with a high air void content is usually achieved by adding aluminum powder to the cement during grinding or concrete production. In an alkaline environment, particularly during cement hydration, the aluminum powder reacts with water to form hydrogen gas. The hydrogen gas forms the pores in the finished building material.

[0004] However, if the clinker or cement contains too much elemental aluminum, hydrogen gas formation can lead to an undesirable increase in volume. This volume increase is particularly detrimental to the shaping of cast concrete components and precast concrete elements.

[0005] A process for producing cement is known from DE 10 2014 113 548 A1. In the cement clinker production process, particularly when large quantities of secondary fuels are used during clinker phase formation, unabsorbed elemental aluminum remains in the finished cement clinker. For example, residues from composite packaging made from secondary fuels, which are not oxidized in the kiln process and are incorporated into the clinker mineralogy, serve as a source of elemental aluminum in the cement clinker. In addition to the constant presence of oxidic aluminum in cement clinker, the elemental aluminum content cannot be quantified using conventional X-ray methods (XRF, XRD).

[0006] CA 838 254 shows a control loop in which the cement clinker is characterized using X-rays and the process (including the raw material feed) is then adjusted depending on the results of the analysis.

[0007] Based on this, it is an object of the present invention to provide a method for operating a plant for producing and / or handling cement and cement clinker, wherein a cement clinker can be produced which is suitable for use as aerated concrete or as concrete rich in air pores without adversely affecting the shape of the concrete components due to an undesirable increase in volume.

[0008] This object is achieved according to the invention by a device having the features of independent method claim 1 and by a method having the features of independent device claim 10. Advantageous further developments emerge from the dependent claims and the description.

[0009] A method for operating a plant for producing and / or handling cement comprises, according to a first aspect, the steps: Taking a material sample of cement from a plant for the production and / or handling of cement, a preferably superstoichiometric dosing of an activating fluid to the material sample, determining the gas pressure and / or the amount of hydrogen gas and / or the amount of elemental aluminum in the mixture of the activating fluid and the material sample, controlling! regulating the fuel discharge from a fuel store for feeding into a combustion device in the plant for the production of cement as a function of the determined gas pressure and / or the determined amount of hydrogen gas and / or elemental aluminum or controlling! regulating the cement discharge from a cement store for feeding into a handling device in the plant for handling cement as a function of the determined gas pressure and / or the determined amount of hydrogen gas and / or elemental aluminum.

[0010] The term "cement" preferably also includes cement clinker and / or a mixture of cement clinker and cement additives, such as sulfate carriers or composite materials, in particular limestone, fly ash, and granulated blast furnace slag. A cement production plant is understood to mean a plant for the production of Portland cement clinker or a plant for the production of clinker with different clinker compositions, for example, calcium sulfoaluminate-based clinker or a plant for the production of a fired precursor for binders from mixtures of burnt lime and pozzolans. Furthermore, the process can be used in plants without their own clinker production for the production of cement from supplied clinker, sulfate carriers, and additives.A handling device is understood to mean, for example, a comminution device for grinding or breaking the cement, in particular the cement clinker, or a mixing plant for mixing a cement from cement clinker and additives or different cements.

[0011] A plant for producing cement preferably comprises a preheater into which cement raw meal is fed and preheated in countercurrent with hot gases. The preheater has, in particular, a plurality of cyclone stages, wherein the cyclones serve to separate solids from the gas stream. A calciner for precalcining the raw meal is arranged between the last and penultimate cyclone stages in the direction of flow of the raw meal. The calciner has a calciner furnace to which, for example, a secondary fuel, such as waste, is fed. The preheated cement raw meal leaving the preheater is fed to a kiln, in particular a rotary kiln, where it is burned to produce cement clinker. The heat in the kiln is preferably supplied via a burner, which can be operated with a wide variety of so-called standard fuels (e.g., gas, coal, oil) and / or so-called secondary fuels (e.g., waste, solvents, municipal waste).Waste and municipal waste in particular also contain significant amounts of elemental aluminium, for example from composite packaging.

[0012] The kiln exhaust gas produced during combustion is at least partially fed into the preheater, where it flows countercurrently to the raw meal being preheated. Following the kiln, the extracted cement clinker is cooled in a clinker cooler and optionally crushed.

[0013] A plant for handling cement comprises, for example, a handling device, in particular a mixing storage facility, preferably a cement storage facility, or a comminution device, such as a grinding plant or a crushing plant, to which the cement, in particular the cement clinker, is fed for comminution. Such a plant can, for example, be part of a previously described plant for cement production. Sampling for taking a sample or a manually drawn sample can, for example, take place at the kiln outlet, the clinker cooler, or from the transport routes for cement, in particular cement clinker, from the kiln to the clinker storage facility or to a cement storage facility. Furthermore, the method can be used in plants without their own clinker production for the production of cement from delivered clinker, sulfate carrier, and grinding materials.

[0014] The preferably crushed material sample is taken, for example, from the handling device or the cooler of a cement production plant and introduced into a sample container. The sample container is preferably sealable. The activation fluid is preferably metered into the sample container in a sufficient quantity, preferably over-stoichiometrically, using a metering device. Alternatively, the metering can also be carried out by separately adding alkali hydroxide powder or tablets with water. The sample is homogenized, for example, by vibration or shaking before or after the addition of the activation fluid. The gas pressure within the sample container is then determined. The pressure measurement or the hydrogen gas determination is preferably carried out continuously from the time the activation fluid is added to the container.During pressure or hydrogen gas determination, the sample container is preferably sealed, and the detector is connected to the sample container volume directly or via a connection, such as a hose. The known X-ray-based chemical analytical methods frequently used in the cement industry cannot distinguish between oxidized aluminum, a major component of clinker, and incompletely oxidized elemental aluminum.

[0015] The gas pressure is preferably determined using a pressure probe or other known measuring devices for determining gas pressure. The amount of hydrogen gas is preferably determined using a volume flow measurement or other known measuring devices for determining gas quantity.

[0016] Controlling / regulating the fuel or cement discharge based on the determined gas pressure and / or the determined amount of hydrogen gas and / or elemental aluminum enabled a simple and relatively rapid adjustment of the fuel or cement discharge to the air entrainment requirements of the final product. This process ensures that the intermediate or final product has an elemental aluminum content suitable for use in aerated concrete or for the production of air-entrained concretes, while at the same time not negatively affecting the shape of the components due to uncontrolled volume growth.

[0017] According to a first embodiment, the activation fluid is an alkali hydroxide solution, for example, potassium hydroxide solution and / or sodium hydroxide solution or a lye. The activation fluid reacts with the sample material to form, among other things, hydrogen gas. A reaction equation for the reaction of the cement clinker or the precalcined raw material of the sample material with the activation fluid is as follows: Al + KOH + 3 H2O = 1 K Al OH 4 + 1.5 H2

[0018] The use of an alkali hydroxide solution or a lye makes it possible to determine the amount of hydrogen gas produced in the reaction described above, which can be used to draw conclusions about the proportion of elemental aluminum in the sample.

[0019] According to a further embodiment, the amount of elemental aluminum in the material sample is calculated from the determined amount of hydrogen gas. The proportion of elemental aluminum is preferably calculated using a linear relationship to the determined amount of hydrogen gas. Preferably, 1.5 moles of hydrogen gas are formed per mole of elemental aluminum. A possible calculation for calculating the proportion of aluminum in the sample is as follows: Al g = H2 I / 33.6 I * 26.9815 g

[0020] The calculation operation for quantifying elemental aluminum can be performed directly in a processor on the analysis device or, after transmission of the raw data, in a computer system directly connected to the detector.

[0021] According to a further embodiment, the amount of elemental aluminum in the fuel output or the cement output is controlled / regulated. The fuel output is preferably formed from a mixture of different fuels, each of which has a known aluminum content. During control / regulation, the proportion of the different fuels used to form the fuel output is preferably varied, such that the amount of elemental aluminum in the fuel output is increased or decreased, preferably with the aim of producing a cement, in particular a cement clinker, with a desired elemental aluminum content. The situation is similar when controlling / regulating the cement output. The cement output is preferably formed from a mixture of different cements, in particular cement clinker and / or clinker additives, each of which has a known aluminum content.During control / regulation, the proportion of the different cements to form the cement output is preferably varied so that the amount of elemental aluminum in the cement is increased or decreased, preferably with the aim of producing a cement with a desired content of elemental aluminum.

[0022] According to a further embodiment, the gas pressure determined after preferably superstoichiometric addition of the activating agent, the amount of hydrogen, and / or the amount of elemental aluminum content preferably determined thereby are compared with a respective limit value. If the determined gas pressure, the amount of hydrogen gas, and / or the amount of elemental aluminum deviate from the limit value, the amount of elemental aluminum in the fuel discharge or the cement discharge is increased or decreased. The contributions of various fuels can be adjusted so that a target value is maintained, or a device for feeding elemental aluminum into the cement clinker production process can be specifically controlled, for example.Preferably, a predetermined limit value is stored for the gas pressure, the amount of hydrogen gas and / or the amount of elemental aluminum, in particular in the analysis device.

[0023] For example, the amount of elemental aluminum in the fuel effluent is increased when the gas pressure falls below the gas pressure limit. The amount of elemental aluminum in the fuel effluent is preferably increased when the amount of hydrogen gas or the amount of elemental aluminum falls below the corresponding limit. For example, the amount of elemental aluminum in the fuel effluent is decreased when the gas pressure exceeds the gas pressure limit. The amount of elemental aluminum in the fuel effluent is preferably decreased when the amount of hydrogen gas or the amount of elemental aluminum exceeds the corresponding limit.

[0024] In a further embodiment, the elemental aluminum contents of individual fuels are not clearly known. In this case, a so-called adaptive mixture control can also be used. With each measurement, an actual state is initially recorded. This actual state can be used to trigger a control to a target state of the subsequent analysis based on a known estimate of the elemental aluminum content in the known fuels. The subsequent analysis determines a deviation between the expected change in the elemental aluminum contents based on the older estimate of the elemental aluminum contents in the fuels or cements and the actually achieved change in the elemental aluminum contents.From the difference between the expected change in elemental aluminum and the new actual value for elemental aluminum from the subsequent analysis, a new, improved estimate of the elemental aluminum content can be derived for each of the fuels or cements involved in the control process. This new, improved estimate is used to process subsequent control interventions until an improved, usually more current, estimate is available.

[0025] According to a further embodiment, the material sample is taken from a preheater and / or a cooler of the cement clinker production plant. It is also conceivable for the material sample to be taken from or downstream of a handling device of a cement clinker handling plant.

[0026] According to a further embodiment, the amount of hydrogen gas in the material sample is determined continuously until no further increase in the gas pressure or the hydrogen gas concentration is observed, or over a period of approximately 2 to 240 minutes, preferably 2 to 45 minutes, most preferably 45 to 240 minutes, in particular more than 240 minutes. If only a slight increase in the gas pressure or the hydrogen concentration is observed over time during the measurement, the measurement can also be aborted and the last result adopted as the measured value. The measurement should preferably be carried out over 2 - 45 minutes and can be extended to 45-240 minutes or, for example, beyond 240 minutes if incomplete conversion is suspected, for example due to coarse grain distribution. This enables relatively rapid control / regulation of the fuel discharge or the cement discharge during the ongoing cement production process.

[0027] According to a further embodiment, the fuel discharge is produced from a plurality of fuels with different proportions of elemental aluminum. The cement discharge is preferably produced from a plurality of cements with different proportions of elemental aluminum.

[0028] The invention also encompasses a plant for producing and / or handling cement. The plant preferably comprises at least one fuel storage facility or cement storage facility with an outlet for discharging a fuel discharge from the fuel storage facility or a cement discharge from the cement storage facility. The plant further comprises a firing device connected to the fuel storage facility for supplying the fuel discharge and / or a handling device connected to the cement storage facility for supplying the cement discharge. Furthermore, the plant comprises an analysis device for analyzing a material sample, which is connected to the outlet of the fuel storage facility or the cement storage facility in such a way that it controls / regulates the fuel discharge from the fuel storage facility or the cement discharge from the cement storage facility.The analysis device is designed to determine the amount of hydrogen gas and / or the gas pressure in the material sample and to control / regulate the fuel discharge or the cement discharge depending on the determined amount of hydrogen gas and / or the determined gas pressure.

[0029] The embodiments and advantages described with reference to the method also apply, in accordance with the device, to the plant for the production and / or handling of cement clinker.

[0030] The analysis device is preferably designed such that it determines the amount of hydrogen gas and / or the gas pressure in the material sample and controls / regulates the fuel discharge or the cement discharge depending on the determined amount of hydrogen gas and / or the determined gas pressure.

[0031] The analysis device preferably comprises a dosing unit for the preferably superstoichiometric dosing of the activation fluid into the material sample 42, in particular the sample container. The analysis device particularly comprises a pressure sensor for determining the gas pressure in the sample material, in particular the gas pressure within the sample container. The analysis device furthermore or alternatively comprises a detector for detecting hydrogen gas, in particular for determining the amount of hydrogen gas contained in the material sample.

[0032] According to one embodiment, the analysis device is designed to calculate the amount of elemental aluminum in the sample material from the determined amount of hydrogen gas.

[0033] According to a further embodiment, the analysis device is designed such that it controls / regulates the amount of elemental aluminum of the fuel discharge as a function of the determined amount of hydrogen gas and / or the determined gas pressure.

[0034] According to a further embodiment, the fuel storage facility comprises a plurality of fuels arranged in separate areas or storage areas within the fuel storage facility. Preferably, the fuels can be removed separately from the fuel storage facility, so that the fuel discharge can be formed from a predetermined quantity of different fuels. Preferably, the cement storage facility comprises a plurality of cements arranged in separate areas or storage areas within the cement storage facility. Preferably, the cements can be removed separately from the cement storage facility, so that the cement discharge can be formed from a predetermined quantity of different cements. Description of the drawings

[0035] The invention is explained in more detail below using several embodiments with reference to the accompanying figures. Fig. 1 shows a schematic representation of a section of a plant for producing cement clinker according to one embodiment. Fig. 2 shows a schematic representation of a section of a plant for handling cement clinker according to another embodiment.

[0036] Fig. 1 shows a section of plant 10 for the production of cement clinker. In Fig. 1For the sake of simplicity, only a calciner 12, a kiln 14, and a cooler 16 connected to the rotary kiln 14 are shown. The plant 10 for producing cement clinker preferably has a preheater for preheating raw meal. The preheater comprises, for example, a plurality of cyclones arranged in stages relative to one another for separating solids from the solid-gas mixture flowing through the preheater. The calciner 12 is preferably arranged between the penultimate and the last cyclone stage of the preheater and serves to calcine the preheated raw meal. The calciner 12 has, in particular, a calciner furnace to which a first fuel 22-26 is fed from a first fuel store 18. The kiln 14, in particular a rotary kiln, is connected to the preheater in the flow direction of the raw meal. In the rotary kiln 14, the preheated raw meal is burned to produce cement clinker.The furnace 14 has a furnace firing 20, to which a second fuel 28-32 is supplied from a second fuel storage 34. The hot gas exiting the furnace 14 is directed into the preheater and flows through it in countercurrent to the raw meal to be preheated.

[0037] A cooler 16 for cooling the fired cement clinker is connected to the kiln 14. The cooler 16 is, for example, a grate cooler in which raw meal is cooled in crossflow and conveyed in the conveying direction.

[0038] For example, the calciner 12 is connected to the first fuel storage area 18 and the kiln 14 is connected to the second fuel storage area 34, so that the fuel 22-26 from the first fuel storage area 18 is fed to the calciner 12 and the fuel 28-32 from the second fuel storage area 34 is fed to the kiln 14. It is also conceivable for the plant 10 to have only one fuel storage area, which is connected to both the calciner 12 and the kiln 14 for feeding with fuel. Each fuel storage area 18, 34 preferably has a plurality of fuels 22-32 that have different properties, in particular compositions, and in particular also different compositions and quantities of the respective incombustible residues, the so-called fuel ash.Preferably, the fuels 22-32 are stored in different areas of the respective fuel storage 18, 34 or in separate storages, so that a targeted withdrawal of a desired fuel 22-32 from the fuel storage 18, 34 is possible.

[0039] For example, each of the fuel stores 18, 34 has at least three different fuels 22-32. The first fuel store 18 has, for example, a fuel 22 that has a higher proportion of elemental aluminum relative to the other fuels 24, 26. Furthermore, the first fuel store 18 has, for example, a fuel 24 that has a lower proportion of elemental aluminum relative to the other fuels 22, 26. The first fuel store 18 also has, for example, a fuel 26 that represents a standard fuel and preferably has a proportion of elemental aluminum that is lower than that of the fuel 22 with the higher proportion of elemental aluminum and higher than that of the fuel 24 with the lower proportion of elemental aluminum. The first fuel discharge 36 discharged from the first fuel store 18 is a mixture of the fuels 22, 24, 26 of the first fuel store 18.

[0040] The second fuel storage 34 comprises, for example, a fuel 28 that has a higher proportion of elemental aluminum relative to the other fuels 30, 32. Furthermore, the second fuel storage 34 comprises, for example, a fuel 30 that has a lower proportion of elemental aluminum relative to the other fuels 28, 32. The second fuel storage 34 also comprises, for example, a fuel 32 that represents a standard fuel and preferably has a proportion of elemental aluminum that is lower than that of the fuel 28 with a higher proportion of elemental aluminum and higher than that of the fuel 30 with a lower proportion of elemental aluminum. The second fuel discharge 38 discharged from the second fuel storage 34 is a mixture of the fuels 28, 30, 32 of the second fuel storage 34.

[0041] The fuels 22-32 preferably comprise substitute fuels, such as waste, which preferably contains a proportion of composite packaging with a high elemental aluminum content. The fuels 22-32, for example, have different elemental aluminum contents, which are stored in particular in the analysis device 40. The first fuel discharge 36 is fed, for example, to the calciner 12, and the second fuel discharge 38 is fed to the furnace firing 20.

[0042] The plant 10 also comprises an analysis device 40 for analyzing a material sample. A material sample 42 is preferably fed to the analysis device 40. The material sample 42 preferably comprises material taken from the calciner 12 and / or the cooler 16. It is also conceivable that the material sample 42 comprises material taken from the kiln 14. The sample material 42, in particular the cement clinker and / or the pre-calcined raw material taken from the plant 10, is preferably stored in a sample container. In particular, the sample material is homogenized by a mixing device of the analysis device. The plant 10 preferably comprises a Fig. 1 A sampling device (not shown) is configured to take a material sample at a predetermined location in the system. The sampling device can be operated, for example, automatically or manually.

[0043] The analysis device 40 comprises, in particular, a pressure sensor for determining the gas pressure prevailing in the container containing the sample material after activation by an activation liquid, such as, for example, KOH solution / NaOH solution, in particular the gas pressure within the sample container. The analysis device 40 further comprises, or alternatively, a detector for detecting hydrogen gas, in particular for determining the amount of hydrogen gas contained in the material sample 42 after activation with an activation liquid. The analysis device 40 preferably comprises a dosing unit for the preferably superstoichiometric dosing of an activation fluid, such as, for example, an alkali hydroxide solution or a lye, into the material sample 42, in particular the sample container.The analysis device 40 is preferably designed to determine the amount of hydrogen gas and / or the amount of elemental aluminum in the material sample. For this purpose, the activation fluid is preferably fed to the sample material in a superstoichiometric amount using the dosing unit. The activation fluid is, for example, a solution containing alkali hydroxide, such as potassium hydroxide solution and / or sodium hydroxide solution. The activation fluid reacts with the sample material to form, among other things, hydrogen gas. However, it is also conceivable for alkali hydroxide in powder or tablet form and water to be metered separately into the sample. A reaction equation for the reaction of the cement clinker or the pre-calcined raw material of the sample material with the activation fluid is as follows: . Al + KOH + 3 H2O = K Al OH 4 + 1.5 H2

[0044] The analysis device 40 is preferably designed such that it uses the detector to determine the amount of hydrogen gas produced during the above reaction. The amount of hydrogen gas is a measure of the elemental aluminum contained in the material sample 42. The analysis device 40 calculates the amount of elemental aluminum in the material sample 42 from the determined amount of hydrogen gas, preferably using a calculation stored in the analysis device or in a connected computer system 40. The amount of hydrogen gas in the sample material is preferably determined continuously over a period of approximately 2-60 minutes, preferably over 60-240 minutes, and for example over a period longer than 240 minutes.

[0045] The analysis device 40 is preferably connected to the first and / or second fuel storage 18, 34 for controlling / regulating the first and / or second fuel discharge 36, 38. Preferably, the fuel discharge 36, 38, in particular the amount of fuel discharge 36, 38 and / or the material composition of the fuel discharge 36, 38 and / or the amount of elemental aluminum in the fuel discharge 36, 38, is controlled / regulated as a function of the amount of hydrogen gas and / or elemental aluminum in the material sample 42 determined by the analysis device 40.

[0046] The analysis device 40 is preferably designed such that it compares the determined gas pressure, the determined amount of hydrogen gas and / or the determined amount of elemental aluminum with a respective predetermined limit value. If the determined gas pressure, the determined amount of hydrogen gas and / or the determined amount of elemental aluminum deviates from the respective limit value, the amount of elemental aluminum in the fuel discharge 36, 38 is increased or decreased. For example, the amount of elemental aluminum in the fuel discharge 36, 38 is reduced if the gas pressure exceeds the gas pressure limit value. The content of elemental aluminum in the fuel discharge 36, 38 is increased, for example, if the gas pressure falls below the gas pressure limit value.

[0047] Preferably, the outlet openings of the storages of the different fuels 22 - 32 are controlled / regulated depending on the determined amount of elemental aluminum and / or the gas pressure. Fig. 1 The storage areas for the fuels 22-32 are connected to the analysis device 40 via data lines 44, 46. The fuel output 36, 38 is preferably formed from specific portions of the different fuels 22-26 and 28-32, which are each weighed via weighing devices 48, 50 and subsequently fed as fuel output 36, 38 to the calciner 12 or the kiln furnace 20.

[0048] It is also conceivable that the analysis device 40 for controlling / regulating the fuel discharge 36, 38 is connected to the respective weighing device 48, 50.

[0049] Fig. 2shows a section of a plant 11 for handling cement. The plant 11 has a handling device 52, such as a crushing device for grinding or crushing the cement, in particular the cement clinker, or a mixing plant for mixing a cement from cement clinker and additives or different cements. Fig. 2 are elements that are essentially the same as those in Fig. 1 are marked with the same reference numerals. The plant 11 has two cement stores 56, 58, each containing a cement, wherein one of the cements, for example the cement of the first cement store 56, has a lower proportion of elemental aluminum than the other cement of the second cement store 58.

[0050] The system 11 further comprises an analysis device 40, which is used for the analysis of a material sample 42 as described with reference to Fig. 1 The material sample 42 of the embodiment of the Fig. 2 is, for example, taken from the handling device 52 and analyzed by means of the analysis device 40. The cement discharge 60 for feeding into the handling device 52 is preferably determined as a function of the values ​​determined by means of the analysis device 40, as with reference to Fig. 1 described, controlled / regulated.

[0051] The Fig. 1 and 2 The systems 10 and 11 described enable a targeted adjustment of the proportion of elemental aluminum in a cement clinker, wherein the control / regulation of the fuel discharge, in particular the proportion of elemental aluminum in the fuel discharge, takes place during the cement production or handling process. List of reference symbols

[0052] 10 Cement clinker production plant 11 Cement clinker handling plant 12 Calciner 14 Kiln 16 Cooler 18 First fuel storage 20 Kiln firing 22 First fuel with increased elemental aluminum content 24 First fuel with lower elemental aluminum content 26 First fuel with medium aluminum content (standard fuel) 28 Second fuel with increased elemental aluminum content 30 Second fuel with lower elemental aluminum content 32 Second fuel with medium aluminum content (standard fuel) 34 Second fuel storage 36 First fuel discharge 38 Second fuel discharge 40 Analysis device 42 Material sample 44 Data line 46 Data line 48 Weighing devices 50 Weighing devices 52 Handling device 54 Cement discharge 56 First cement storage 58 Second cement storage

Claims

1. A method of operating a plant (10, 11) for the production and / or handling of cement, comprising the steps of: - Removal of a material sample (42) of cement clinker from a plant (10, 11) for the production and / or handling of cement, - Dosing an activation fluid to the material sample (42), characterized by - determining the gas pressure and / or the amount of hydrogen gas and / or the amount of elemental aluminum in the mixture of the activation fluid and the material sample (42), and - open loop / closed loop control of the fuel discharge (36, 38) from a fuel store (18, 34) for feeding into a firing device (12, 14) of the plant (10, 11) for producing cement as a function of the determined gas pressure and / or the determined quantity of hydrogen gas and / or elemental aluminum, or - open loop / closed loop controlling the cement discharge (54) from a cement store (56, 58) for feeding into a handling device (52) of the plant (10, 11) for handling cement as a function of the determined gas pressure and / or the determined amount of hydrogen gas and / or elemental aluminum.

2. The method according to claim 1, wherein the activating fluid comprises an alkali hydroxide solution or an alkaline solution.

3. The method according to any one of the preceding claims, wherein the amount of elemental aluminum in the material sample (42) is calculated from the determined amount of hydrogen gas.

4. The method according to any one of the preceding claims, wherein the amount of elemental aluminum of the fuel discharge (36, 38) or the cement discharge (54) is open loop / closed loop controlled.

5. Method according to one of the preceding claims, wherein the determined gas pressure, the amount of hydrogen and / or the amount of elemental aluminum is compared with a respective limit value and, if the determined pressure, the amount of hydrogen and / or the amount of elemental aluminum deviates from the limit value, the amount of elemental aluminum in the fuel discharge (36, 38) or the cement discharge (54) is increased or decreased.

6. Method according to one of the preceding claims, wherein the material sample (42) is taken from a preheater and / or a cooler of the plant (10) for producing cement clinker.

7. The method according to any one of the preceding claims, wherein the amount of hydrogen gas in the material sample (42) is determined over a period of about 2 to 240 minutes, preferably 2 to 45 minutes, in particular more than 240 minutes.

8. The method according to any one of the preceding claims, wherein the fuel discharge (36, 38) is made from a plurality of fuels (22 - 32) having different proportions of elemental aluminum.

9. Plant (10, 11) for the production and / or handling of cement clinker, comprising a fuel store (18, 34) or a cement store (56, 58) with an outlet for discharging a fuel discharge (36, 38) from the fuel store (18, 34) or a cement discharge (54) from a cement store (56, 58), a firing device (12, 14) which is connected to the fuel store (18, 34) for feeding the fuel discharge (36, 38; 54) and / or a handling device (52) which is connected to the cement store (56, 58) for feeding the cement discharge (54), and an analysis device (40) for analyzing a material sample (42), which is connected to the outlet of the fuel store (18, 34) or the cement store (56, 58) in such a way that it open loop / closed loop controls the fuel discharge (36, 38; 54) from the fuel store (18, 34) or the cement discharge (54) from the cement store (56, 58), characterized in that the analysis device (40) is designed such that it determines the quantity of hydrogen gas and / or the gas pressure in the material sample and open loop / closed loop controls the fuel discharge (36, 38) or the cement discharge (54) as a function of the determined quantity of hydrogen gas and / or the determined gas pressure.

10. Plant (10, 11) according to claim 9, wherein the analysis device (40) is designed such that it calculates the amount of elemental aluminum in the material sample (42) from the determined amount of hydrogen gas.

11. Plant (10, 11) according to claim 9 or 10, wherein the analysis device (40) is designed such that it controls / regulates the amount of elemental aluminum of the fuel discharge (36, 38) or the cement discharge (54) as a function of the determined amount of hydrogen gas and / or the determined gas pressure.

12. Plant (10, 11) according to any one of claims 9 to 11, wherein the fuel storage (18, 34) comprises a plurality of fuels arranged in separate areas or storages within the fuel storage (18, 34).