LU101612B1 - Device and method for the production of cement clinker - Google Patents

Abstract

The present invention relates to an apparatus for producing cement clinker, the apparatus having a preheater 50, a calciner 60 and a cooler 70, the apparatus having a feed for cement raw material, characterized in that between the feed for cement raw material and the preheater 50 a mechanical fluidized bed reactor 30 is arranged, wherein the calciner 60 is connected directly to the cooler 70.

Description

, thyssenkrupp Industrial Solutions AG 190289P00LU; thyssenkrupp AG 12 January 20, 2020 101612 | Device and method for the production of cement clinker | The invention relates to an apparatus for producing cement clinker without a | Rotary kiln.

1 ; From DE 27 26 138 A1 a method and a device for the production of | Cement clinker made from moist agglomerated cement raw material known. The | The device has a preheating zone, a deacidification zone and a sintering zone. | 10 DE 102017 202 824 A1 discloses a plant for the production of cement, in particular cement clinker, with a preheater, which has a plurality of | Has cyclones, a calciner for deacidification and a rotary kiln known. In the cement process, the mineral raw material is first ground, then preheated ‘15 in the preheater, deacidified in the calciner and then in the | Finally heat the oven. The material coming out of the furnace is stored in the | subsequent cooler cooled.

A common problem is that there is material build-up in the area of the: 20 preheater. These material deposits are caused in particular by dust, | very fine-grained material that is produced when the mineral starting material | arises. In order to remove these material deposits, the affected system parts must be cleaned under sometimes dangerous working conditions. To do this: the furnace must be stopped.

| A method for drying granulated material is known from EP 3 476 812 A1.

From EP 0500 561 B1 a device for mixing and thermal treatment of solid particles with a substantially horizontally arranged | Known container. From DE 1 051 250 a method and a device for | Mixing powdery or fine-grained masses with liquids is known. Off | DE2729477 C2 is a ploughshare-like mixing tool for such

| thyssenkrupp Industrial Solutions AG 190289P00LU thyssenkrupp AG 2112 01/20/2020 4101612 | Devices known. A similar mixing tool for such devices is also; known from DE 197 06 364 C2. Appropriate mixing devices are available from | of the company Gebrüder Lödige Maschinenbau GmbH under the name Pflugschar- | Mixers are offered and create a mechanical fluidized bed inside.

| 5: The object of the invention is to provide a cement process and a device for this which dispenses with an oven.

; This object is achieved by the device with the | specified in claim 1 | 10 features as well as by the method with the features specified in claim 10. Advantageous further developments result from the subclaims, the | following description as well as the drawings.

The device according to the invention for producing cement clinker has a | 15 preheater, a calciner and a cooler as well as a feed for | Cement raw material.

According to the invention, a mixer, for example and preferably a mechanical fluidized bed reactor, is arranged between the feed for cement raw material and the preheater. Next, the calciner is directly connected to the cooler.

| Using the mechanical fluidized bed reactor, it was found that | an extremely uniform agglomeration of the starting material is achieved. This | 25 means that, in addition to the excellent, non-sticking passage through the preheater and the calciner, there is also an extremely good and, above all, uniform; Warming and thus already implementation of the starting material results. It has been shown that already after passing through the calciner the | Starting material has been converted into cement clinker. The apparatus is preferred for making belite-based clinker. Advantage compared to the production / of especially alite-based clinker, for which an additional furnace; is required is the lower energy requirement as well as the shorter dwell time and the

; thyssenkrupp Industrial Solutions AG 190289P00LU ‘thyssenkrupp AG 3/12 January 20, 2020 u101612; lower investment, which leads to a cheaper product. This leads to a | Savings both in the construction of the system, but above all in operation.

| While gases are used in a normal fluidized bed reactor to produce a; 5 to mix solid with the gas space and thus to fluidize and to | transport, this is achieved purely mechanically 1 in a mechanical fluidized bed reactor with the help of a mixing tool.

; It has been shown that the effect of the mechanical fluidized bed reactor is that the; 10 very fine particles, which arise during grinding, agglomerate. This will! Avoid dust formation in the following process steps, since in particular | particularly small particles can be reduced very significantly. This is where it comes from; also much less for gluing material in areas of increasing: temperature, for example and in particular on the walls of the preheater.

; 15 | | The preheater can be designed as a direct current preheater. Here, gas | and solids are transported in the same direction, while the heat from the gas to the | Solid is transferred. An example of this are cyclones connected in series. | The heat transfer takes place in the connections between the cyclones in the; 20 direct current, the cyclones then serve to separate gas and solids, | Alternatively, the preheater can be designed as a countercurrent preheater. A | The corresponding pre-heater is for example and in particular from the | DE 383 42 15 A1 is known.

| 2 | In a further embodiment of the invention, the mechanical fluidized bed reactor has an essentially horizontally arranged container. Along: the longitudinal axis of the container a shaft is arranged in the middle, whereby radially at the | Shaft mixing tools are arranged. In the simplest case, these mixing tools can be arranged in the form of rods and perpendicularly on the shaft. Are particularly preferred. the mixing tools ploughshare-shaped. Examples of ploughshare-shaped; Mixing tools can, for example, be the DE2729477C2 or the | DE 197 06 364 C2 can be found.

| thyssenkrupp Industrial Solutions AG 190289P00LU / thyssenkrupp AG on January 20, 2020 101642 Ë In a further embodiment of the invention, the mechanical | Fluidized bed reactor on at least one fluid supply. Other | Fluid feeds, in particular along the direction of transport of the material, | 5 be arranged. The fluid supply is particularly preferably used to supply | Water. Water supports the agglomeration and thus leads to more uniform | Particles. The reduction in the amount of dust prevents material from sticking in | the preheater particularly efficiently avoided.

| 10 In a further embodiment of the invention, before the mechanical; Fluidized bed reactor arranged a fluid supply. This can be present in addition or as an alternative to a fluid supply in the mechanical fluidized bed reactor.

| In a further embodiment of the invention, the mechanical | 15 fluidized bed reactor has a fuel supply. Alternatively or additionally, | a fuel supply can also take place upstream of the mechanical fluidized bed reactor. ; This allows the fuel to be incorporated into the particles produced by agglomeration in the mechanical fluidized bed reactor. This fuel ignites: in a later process after its ignition temperature has been exceeded, for example in the | 20 calciner, and thus leads to a much more targeted heating of the raw material.

| In a further embodiment of the invention, between the mechanical | Fluidized bed reactor and the preheater, a first riser dryer is arranged. The | Riser dryer has two advantages. On the one hand, in particular water, which at | 25 of the agglomeration used in the mechanical fluidized bed reactor is discharged | will. On the other hand, the material can be adjusted to the entrance height of the preheater; be transported. Furthermore, the riser dryer can also be used to set the | Particle size can be used. About the gas velocity and, if necessary, about; a separation cyclone at the upper end of the riser dryer can in particular; 30 particles that are too large are separated and, in particular, returned for regrinding. will.

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; thyssenkrupp Industrial Solutions AG 190289P00LU | thyssenkrupp AG 5/19 01/20/2020 101612 | In a further embodiment of the invention, the feed for cement raw material has a mill.

| In a further embodiment of the invention with a riser dryer and a | 5 mill, the device has a return for coarse material from the bottom | of the riser dryer to the mill. This allows particles that either not | are sufficiently finely ground or too large in the mechanical fluidized bed reactor | Particles are agglomerated, removed and fed back for grinding.

| In a further embodiment of the invention, the cooler consists of one to eight | Cyclones. Cyclones allow the cement clinker to cool down quickly and efficiently. | At the same time, the process gas is heated in countercurrent. For example, it can also: be cooled to below 600 ° C in the absence of oxygen, for example by means of | water-cooled cooling screws.

| The preheater and the cooler are preferably constructed from cyclones. This means that | a similar material throughput both when heating and when cooling the | Material and thus to realize an even flow of material.

| In a further embodiment of the invention, there is a | Arranged homogenization stage. In the homogenization stage, | preferably different starting materials brought together and mixed. | Starting materials are in particular and for example lime (CaCOs), silicon dioxide | 25 (SiO »), also as sand or gravel, silicates, clays, aluminum oxide and / or iron ore but | also water.

| In a further aspect, the invention relates to the use of a | Device according to the invention for the production of belite, also dicalcium silicate, C2S. 30 or 2 CaO - SiOz.

| In contrast to alite, or tricalcium silicate, CsS or 3 CaO - SiO2, there are already | lower firing temperatures and times sufficient to produce the na

| thyssenkrupp Industrial Solutions AG 190289P00LU; thyssenkrupp AG 6/12 January 20, 2020 01612 | Cement clinker. At the same time, the rapid cooling in the | Device prevents unwanted continued burning and thus prevents the generation of alite | and thus avoidance of innomogeneities in the manufacture of belite.

| 5 Since usually other additives, such as iron oxide or aluminum oxide as a starting material | are added, usually no pure alite or belite is used as cement clinker | creates what is also not wanted. For the purposes of the invention, it is understood that | Belit is proportionally the most frequent phase of the product, so no other phase is a | has a higher proportion in mass%. The proportion of | is for example and preferred 10 belite at least 50 mass%.

| In a further aspect, the invention relates to a method for producing | Cement clinker, the method comprising the following steps: | a) grinding the cement raw material in a mill, | 15 b) preheating in a preheater, | c) dehydration in a calciner, | d) cooling in a cooler.

| The cement raw material goes through these steps in chronological order and becomes | 20 processed into cement clinker in this way, these processes run in one | continuous process usually in parallel next to each other.

| According to the invention, step d) directly follows step c). Next is between | Step a) and step b) carried out the following step: | 25 ee) agglomerate the ground material so that 90% of all particles have a | Have particle size between 200 µm and 5 mm.

| In this way, the starting material can advantageously be ground very finely. | Usually a compromise has to be made. The finer the materials | 30 are ground, the better and more homogeneous the firing process runs. Too small | However, particles are disruptive to the process, as already stated. But since the | Particles are not introduced into the process in the fine milled size, | this limitation does not apply.

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| thyssenkrupp Industrial Solutions AG 190289P00LU | thyssenkrupp AG 01/20/2020 | 7/12 lu101612 | In a further embodiment of the invention, step e) is carried out in a mechanical | Fluidized bed reactor carried out.

| 5 In a further alternative embodiment of the invention, step e) is started with a | Granulating plate carried out.

| In a further alternative embodiment of the invention, step e) is started with a | Good bed roller mill carried out.

‘In a further alternative embodiment of the invention, step e) starts with a | Bricket press carried out.

| For the production of cement clinker it is unusual that immediately after the | 15 the cement clinker obtained is cooled directly in a calciner. | Usually this actually takes place here by burning the starting product to | manufacture cement clinker in a rotary kiln, which is attached to the calciner | connects.

| The method for the production of cement clinker whose | The main component is belite.

| In a further embodiment of the invention, between step e) and step b); performed the following step: | 25 f) drying in a first riser dryer.

| In a further embodiment of the invention, before and / or in step e) a | Fluid, especially water, added. This allows the agglomeration in the | mechanical fluidized bed reactor are supported.

| In a further embodiment of the invention, before and / or in step e) a | Fuel, in particular a fuel with an ignition temperature of 500 ° C to | 650 ° C was added. For example, the fuel is coal, coal dust or

| thyssenkrupp Industrial Solutions AG 190289P00LU | thyssenkrupp AG 9/12 January 20, 2020 101642. Cellulose. The ignition in the temperature range 500 ° C to 650 ° causes a local | Heating up in the calciner. This ensures an extremely quick and evident implementation; of the raw materials to cement clinker.

| In a further embodiment of the invention, wet grinding takes place in step | a) and subsequent agglomeration in step e) without a preceding one; Drying.

; carried out in a further embodiment of the invention such that the | 10 The nitrogen content of the gas phase in the preheater is less than 30% by volume, preferably less than | 15% by volume, particularly preferably less than 5% by volume. This | is preferred achieved, in which the combustion is carried out with oxygen-enriched air. The advantage is that, due to the significantly reduced amount of gas, a subsequent. Separation of the resulting carbon dioxide from the gas phase is facilitated. ; This is advantageous with the agglomeration of the starting material, since dusts interfere with the separation of the carbon dioxide. Dusts are, however, particularly greatly reduced by the method according to the invention. The deposition of the; Carbon dioxide serves to avoid the emission of gases that are harmful to the climate. A | Another advantage is that the | 20 calciner can be operated in particular 50 ° C to 100 ° C hotter. The | The use of agglomerated | Material bypassed.

| The device according to the invention and the method are explained in more detail below with reference to the exemplary embodiments shown in FIG. 25 of the drawings.

| Fig. 1 First device for the production of cement clinker without a furnace | Fig. 2 Second device for the production of cement clinker without a furnace] 30 In Fig. 1 is a first device according to the invention for the production of | Cement clinker shown schematically. The starting material is ground in a mill 10 :. The different starting materials are in a homogenization stage; 20 mixed and fed to the mechanical fluidized bed reactor 30. Afterward

| thyssenkrupp Industrial Solutions AG 190289P00LU | thyssenkrupp AG 9/12 20.01.2020 u101612] the material is conveyed in a riser dryer 40, from there the material goes into the preheater 50 and then into the calciner 60. The calciner 60 becomes | heated by means of the burner 80. The finished cement clinker comes out of the calciner | 60 into the cooler 70. Both the preheater 50 and the; 5 coolers 70 designed as a cascade of 2 to 8 cyclones.

| The second device shown in FIG. 2 differs from the first embodiment shown in FIG. 1 only in that, for structural reasons, the cooler 70 is divided into a first partial cooler 72 and a second partial cooler 74, the | 10 material between the first partial cooler 72 and the second partial cooler 74 by means of a | Riser pipe 90 is promoted. In particular, the first partial cooler 72 consists of a | Cyclone and the second partial cooler 74 from one to eight cyclones.

| Reference symbols | 15 10 mill | 20 homogenization stage | 30 mechanical fluidized bed reactor | 40 riser dryer: 50 preheaters | 20 60 calciner | 70 cooler 72 first partial cooler 74 second partial cooler | 80 burners; 25 90 riser pipe

Claims (1)

| “Thyssenkrupp Industrial Solutions AG 190289P00LU | thyssenkrupp AG 10/12 20.01.2020 101612 _ Patent claims, 1. Device for producing cement clinker, the device having a preheater (50), a calciner (60) and a cooler (70), the | 5 device has a feed for cement raw material, thereby | characterized that between the feed for cement raw material and the | Preheater (50) a mixer is arranged, wherein the calciner (60) directly with | the cooler (70) is connected. | 10 2. Device according to claim 1, characterized in that between the | Mixer and the preheater (50) a first riser dryer (40) is arranged: 3. Device according to claim 2, characterized in that the feed for | 15 cement raw material comprises a mill (10), the device having a return for coarse material from the underside of the first; Having riser dryer (40) to the mill (10). ; 4. Device according to one of the preceding claims, characterized. 20 characterized in that the mixer is a mechanical fluidized bed reactor (30). | 5. Apparatus according to claim 4, characterized in that the mechanical | Fluidized bed reactor (30) has a fluid supply, | 25 6. Device according to one of claims 4 to 5, characterized in that | the mechanical fluidized bed reactor (30) has a substantially horizontal | arranged container, wherein along the longitudinal axis of the container | a shaft is arranged in the middle, with mixing tools | are arranged. | 30th 7. Apparatus according to claim 6, characterized in that the | Mixing tools are ploughshare-shaped. ; 8. Device according to one of the preceding claims, characterized | 35 characterized that between the feed for cement raw material and the | thyssenkrupp Industrial Solutions AG 190289P00LU; thyssenkrupp AG 11/12 January 20, 2020, 101612 | mechanical fluidized bed reactor (30) a homogenization stage (20); is arranged. ; 9. Use of a device according to one of the preceding claims for | 5 Manufacture of Belite. | 10. A method of manufacturing cement clinker, the method comprising the following | Comprises steps: | a) grinding the cement raw material in a mill (10); 10 b) preheating in a preheater (50), | c) deacidifying in a calciner (60); d) cooling in a cooler (70), | characterized in that step d) directly follows step c), | the following step being carried out between step a) and step b):; 15 e) Agglomerating the ground material so that 90% of all particles have a | Have particle size between 200 µm and 5 mm. | 11.Verfahren according to claim 10, characterized in that the; Agglomerating in step e) material in a mechanical fluidized bed reactor | 20 (20) is carried out. | 12. The method according to any one of claims 10 to 11, characterized in that; that the following step is carried out between step e) and step b): | f) drying in a first riser tube dryer (40). | 13. The method according to any one of claims 10 to 12, characterized in that. that before and / or in step e) a fluid, in particular water, is added. ; 14. The method according to any one of claims 10 to 13, characterized in that; 30 that before and / or in step e) a fuel, in particular a fuel with: an ignition temperature of 500 ° C. to 650 ° C., is added. ; 15.Verfahren according to any one of claims 10 to 14, characterized in, | that in step c) oxygen-enriched air is supplied. . 35