LU101611B1 - Apparatus and method for the production of cement clinker with a mechanical fluidized bed reactor - Google Patents

Abstract

The present invention relates to an apparatus for producing cement clinker, the apparatus having a preheater 40, a calciner 50 and a furnace 60, the apparatus having a feed for cement raw material, characterized in that between the feed for cement raw material and the preheater 40 a mechanical fluidized bed reactor 20 is arranged.

Description

| thyssenkrupp Industrial Solutions AG 190288P00LU; thyssenkrupp AG 11 January 20, 2020 101 611 | Device and method for the production of cement clinker with a | mechanical fluidized bed reactor | The invention relates to a device for producing cement clinker with | 5 improved process management due to low build-up, especially in the calciner | and in the area up to the furnace inlet.

! 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: 10 device has a preheat zone, a dehydration zone, and a sintering zone. | DE 10 2017 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. | 05 i In the cement process, the mineral raw material is first ground,: then preheated in the preheater, deacidified in the calciner and then in the | Finally heat the oven. The material coming out of the furnace is cooled in the subsequent cooler.

] 20 | A common problem is that there is a build-up of material in the area of the | Preheater comes. 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 | 25 system parts are cleaned under sometimes dangerous working conditions. In addition | the furnace must be stopped.

| From EP 3 476 812 A1 there is a method for drying granulated material | known.

| 30 | The object of the invention is to reduce or even prevent material deposits in the area of the preheater 1.

; thyssenkrupp Industrial Solutions AG 190288P00OLU | thyssenkrupp AG - 01/20/2020 101611 ‘From EPO500561B1 a device for mixing and thermal, treatment of solid particles with an essentially 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 | 5 of DE2729477 C2 is a plowshare-like mixing tool for such | Devices known. A similar mixing tool for such devices is also; known from DE 197 06 364 C2. Appropriate mixing devices are available from | the company Gebrüder Lödige Maschinenbau GmbH under the name Pflugschar-; Mixers are offered and create a mechanical fluidized bed inside.

| 10; This object is achieved by the device with those specified in claim 1; Features and by the method with the features specified in claim 9. ; Advantageous further developments result from the subclaims, the | following description as well as the drawing.

| The device according to the invention for producing cement clinker has a | Preheater, calciner and furnace. The device also has a | Feeder for cement raw material. This corresponds to the usual structure of a | Device for the production of cement clinker and is known from the prior art Ë 20.

| According to the invention, between the feed for cement raw material and the | Preheater a mixer, for example and preferably a mechanical one Fluidized bed reactor arranged.

: 25 | While gases are used in a normal fluidized bed reactor to produce a | To mix solids with the gas space and thus to fluidize and to | transport, in a mechanical fluidized bed reactor this becomes purely mechanical | achieved using a blending tool.

. 30 | It has been shown that the effect of the mechanical fluidized bed reactor is that the | very fine particles, which arise during grinding, agglomerate. This will; Avoid dust formation in the following process steps, since in particular

; thyssenkrupp Industrial Solutions AG 190288P00LU | thyssenkrupp AG 511 01/20/2020 01611 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.

| 5 The preheater can be designed as a direct current preheater. Here are gas. and solid is transported in the same direction while the heat is transferred from the gas to the solid. An example of this are cyclones connected in series. | The heat transfer takes place in the connections between the cyclones in the | Direct current, the cyclones then serve to separate gas and solids, | 10 | Alternatively, the preheater can be designed as a countercurrent preheater. A: corresponding Vorwdrmer is for example and in particular from the | DE 383 42 15 A1 is known.

| 15 In a further embodiment of the invention, the mechanical | Fluidized bed reactor on a substantially horizontally arranged container. Along . the longitudinal axis of the container is centrally arranged a shaft, wherein radially on the; Shaft mixing tools are arranged. These mixing tools can be used in the simplest form | Case be rod-shaped and arranged vertically on the shaft. Particularly preferred are | 20 the mixing tools are ploughshare-shaped, examples of ploughshare-shaped; Mixing tools can, for example, be the DE2729477C2 or the | DE 197 06 364 C2 can be taken from, | In a further embodiment of the invention, the mechanical; 25 fluidized bed reactor on at least one fluid supply. Other | Fluid feeds, in particular along the direction of transport of the material, | 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 | 30 avoided the preheater particularly efficiently.

| thyssenkrupp Industrial Solutions AG 190288P00LU | thyssenkrupp AG ani January 20, 2020 14101611. In a further embodiment of the invention, a fluid feed is arranged upstream of the mechanical fluidized bed reactor. This can additionally or alternatively | be present to a fluid supply in the mechanical fluidized bed reactor.

| 5 In a further embodiment of the invention, the mechanical | Fluidized bed reactor has a fuel supply. Alternatively or additionally can; a fuel supply can also take place upstream of the mechanical fluidized bed reactor. , This allows the fuel to enter the mechanical | Fluidized bed reactor resulting particles are incorporated. This fuel ignites | 10 in a later process after its ignition temperature has been exceeded, for example in the | Calcinator, 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 riser dryer arranged. The | 15 Riser tube dryer has two advantages. On the one hand, water in particular, which at | the agglomeration is used in the mechanical fluidized bed reactor, discharged | will. On the other hand, the material can be brought to the entrance height of the preheater | be transported. Furthermore, the riser dryer can also be used to set the | Particle size are used. Via the gas velocity and, if necessary, via a separating cyclone at the upper end of the riser dryer, in particular | particles that are too large are separated and, in particular, returned for regrinding.

| In a further embodiment of the invention, the feed for; 25 cement raw material on a mill.

| In a further embodiment of the invention with a riser dryer and a; Mill has the device a return for coarse material from the bottom | of the riser dryer to the mill. This allows particles that either not | 30 are sufficiently finely ground or are agglomerated to large particles in the mechanical fluidized bed reactor, removed and fed back to the grinding.

‘Thyssenkrupp Industrial Solutions AG 190288P00LU | : thyssenkrupp AG: 511 01/20/2020 101611 | 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,; b) preheating in a preheater, | 5 c) _deacidification in a calciner,; d) Firing in an oven.

| The cement raw material goes through these steps in chronological order and becomes | processed into cement clinker in this way. In purely practical terms, these processes run in one | 10 continuous process usually in parallel next to each other.

; The method according to the invention differs from this conventional method in that the following step is carried out between step a) and step b): | e) agglomerating the ground material so that 90% of all particles have a 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 | are ground, the better and more homogeneous the firing process is. Too small | However, particles are disruptive to the process, as already stated. But since the | Particles are not introduced into the process in the finely ground size: this limitation does not apply.

| In a further embodiment of the invention, step e) is carried out in a mechanical; 25 fluidized bed reactor carried out.

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

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

| thyssenkrupp Industrial Solutions AG 190288 P00LU | thyssenkrupp AG 6/11 January 20, 2020 1101641 | In a further alternative embodiment of the invention, step €) starts with a | Bricket press carried out.

It has been shown that especially in a mechanical fluidized bed reactor, agglomeration of the ground material results in a particularly suitable particle size distribution for the further process steps.

In a further embodiment of the invention, between step e) and step b); the following step is carried out:: 10 f) drying in a rising tube 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.

| 15 | 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. The fuel from the group comprising coal is preferred, | Coal dust and cellulose.

| 2 | In a further embodiment of the invention, wet grinding takes place in step a) and subsequent agglomeration in step e) without a preceding | Drying.

| 25 In a further embodiment of the invention carried out in such a way that the. 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 carbon dioxide formed from the gas phase is facilitated.

| This is advantageous with the agglomeration of the starting material, since dusts in the. Deposition of carbon dioxide are bothersome. The thyssenkrupp Industrial Solutions AG 190288P00LU | thyssenkrupp AG on 01/20/2020 u101641 | Method according to the invention just particularly greatly reduced. The deposition of the | Carbon dioxide serves to avoid the emission of gases that are harmful to the climate. A | Another advantage is that by using oxygen-enriched air the; Calcinator can be operated in particular 50 ° C to 100 ° C hotter. The | 5 The increased tendency of the material to build up is achieved through the use of agglomerated | Material bypassed.

The device according to the invention and the method are shown below with the aid of a | The embodiment illustrated in the drawing is explained in more detail.

: 10 | Fig. 1 Device for the production of cement clinker with a mechanical fluidized bed reactor.

| In Fig. 1, the device according to the invention is shown schematically. First, | 15 grind the starting material in a mill 10. The milled material is then passed into a mechanical fluidized bed reactor 20. Between the mill 10 and | the mechanical fluidized bed reactor 20 may be provided with a bearing. It can | also a mixing device upstream of the mechanical fluidized bed reactor 20; be arranged to for example and in particular to | Mix 20. Alternatively or additionally, one or more solid starting materials can be used with | one or more liquids are mixed, for example and in particular | water can be added. That from the mechanical fluidized bed reactor 20 | Exiting material is then conveyed in a riser dryer 30 and / from there into a preheater 40, which preferably consists of a group of 3 | 25 to 8 cyclones connected in series. In the preheater 40, the hot gas flows from the furnace 60 and the calciner 50 in countercurrent to the solid, which | is heated thereby. The calciner 50 can, in addition to the heat generated by the | Gas flow comes from the furnace 60, additional heat sources, in particular burners, | exhibit. The material is passed on from the calciner 50 to the furnace 60 and from there to the cooler 70. The finished cement clinker can then be stored, transported away or further processed.

| thyssenkrupp Industrial Solutions AG 190288P00LU | thyssenkrupp AG January 20, 2020; 8/11 lu101611 | Reference number

; 10 mill mechanical fluidized bed reactor:

| 30 riser dryer

| 5 40 preheaters

| 50 calciner

60 oven

. 70 cooler

Claims (1)

, thyssenkrupp Industrial Solutions AG 190288P00LU: thyssenkrupp AG 9/11 January 20, 2020 101611, claims | 1. Apparatus for producing cement clinker, the apparatus having a preheater (40), a calciner (50) and a furnace (60), the | 5 device has a feed for cement raw material, thereby | characterized in that between the feed for cement raw material and the. Preheater (40) a mixer is arranged. ; 2. Device according to claim 1, characterized in that between the | 10 mixer and the preheater (40) a riser dryer (30) is arranged. | 3. Device according to one of the preceding claims, characterized | characterized in that the feed for cement raw material is a mill (10) | having. ‘4. Apparatus according to claim 2 and claim 3, characterized in that | the device provides a return for coarse material from the underside of the | Has riser dryer (30) to the mill (10). . 20 5. Device according to one of the preceding claims, characterized | characterized in that the mixer is a mechanical fluidized bed reactor (20). | 6. The device according to claim 5, characterized in that the mechanical; Fluidized bed reactor (20) has a fluid supply. | 25; 7. Device according to one of claims 5 to 6, characterized in that; the mechanical fluidized bed reactor (20) has a substantially horizontal | arranged container, wherein along the longitudinal axis of the container; a shaft is arranged in the middle, mixing tools 30 being arranged radially on the shaft. | 8. The device according to claim 7, characterized in that the; Mixing tools are ploughshare-shaped. ; 35 9. A method of manufacturing cement clinker, the method being the following | Comprises steps: | thyssenkrupp Industrial Solutions AG 190288P00LU | thyssenkrupp AG 10/11 January 20, 2020 Iu101611 | a) grinding the cement raw material in a mill (10), b) preheating in a preheater (40), | c) deacidification in a calciner (50), d) firing in a furnace (60),; 5 characterized in that between step a) and step b) the following; Step is carried out: | e) agglomerating the ground material so that 90% of all particles have a particle size between 200 µm and 5 mm. ‘10 10. The method according to claim 9, characterized in that the agglomeration in step e) material in a mechanical fluidized bed reactor (20) | is carried out. | 11.Verfahren according to any one of claims 9 to 10, characterized in that | 15 the following step is carried out between step e) and step b): | f) drying in a rising tube dryer (30). ; 12. The method according to any one of claims 9 to 11, characterized in that. before and / or in step e) a fluid, in particular water, is added. | 20 | 13.Verfahren according to any one of claims 9 to 12, characterized in that! before and / or in step e) a fuel, in particular a fuel with a | Ignition temperature of 500 ° C to 650 ° C, is added. | 25 14. The method according to any one of claims 9 to 13, characterized in that | oxygen-enriched air is supplied in step c) and / or in step d).