EP3775742A1 - System and burner lance for additionally producing white cement - Google Patents
System and burner lance for additionally producing white cementInfo
- Publication number
- EP3775742A1 EP3775742A1 EP19716842.0A EP19716842A EP3775742A1 EP 3775742 A1 EP3775742 A1 EP 3775742A1 EP 19716842 A EP19716842 A EP 19716842A EP 3775742 A1 EP3775742 A1 EP 3775742A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary kiln
- burner lance
- cooling water
- cement clinker
- cement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004568 cement Substances 0.000 title claims abstract description 147
- 238000004519 manufacturing process Methods 0.000 claims abstract description 45
- 239000000498 cooling water Substances 0.000 claims abstract description 44
- 235000012054 meals Nutrition 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 238000010791 quenching Methods 0.000 claims abstract description 13
- 230000000171 quenching effect Effects 0.000 claims abstract description 12
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- 238000001816 cooling Methods 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 3
- 238000007654 immersion Methods 0.000 claims 1
- 230000002829 reductive effect Effects 0.000 abstract description 15
- 239000007921 spray Substances 0.000 abstract description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 2
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 2
- 239000004571 lime Substances 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 68
- 239000007789 gas Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 238000001149 thermolysis Methods 0.000 description 10
- 239000011398 Portland cement Substances 0.000 description 8
- 239000000446 fuel Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000003638 chemical reducing agent Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000000295 fuel oil Substances 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 239000011651 chromium Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004886 process control Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 230000018199 S phase Effects 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/34—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/38—Arrangements of cooling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
- F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water
- F27D2009/0016—Water-spray
Definitions
- the invention relates to a plant for the production of cement clinker for the further production of white cement, comprising a rotary kiln for sintering lime-containing and silicate-containing raw meal and optionally other oxides to cement clinker, wherein a burner lance is present at Drehrohrofenkopf the Drehrohro- fens to produce the necessary Sintering temperature in the rotary kiln, and wherein the burner lance extends into the rotary kiln, and at least one line for guiding cooling water in the rotary kiln for quenching the sintered cement clinker still in the rotary kiln.
- white cement for use as a high-performance cement has not been fully explored, despite its long-standing reputation, and it is conceivable that white cement has a number of advantages that are unknown today, which distinguish this cement for special applications.
- the production of white cement requires not only the selection of selected raw materials, which are free of cement color-changing iron, manganese, chromium or titanium, but also requires compliance with the particular manufacturing conditions required for the production of white cement - cement clinker. Blanco-Varela et al. have in Adv. in Cement Research, 1997, 9, no.
- German patent application DE 25 44 343 B2 discloses a process for the production of white cement.
- it is taught to throw off the cement clinker from the rotary kiln to a paddle wheel.
- the paddle wheel transports the hot cement clinker past two spray nozzles.
- fuel oil is sprayed onto the still hot cement clinker, during which the fuel oil heats up and ignites.
- the reductive atmosphere is maintained and immediately after spraying with fuel oil, the cement clinker is sprayed with water. The water cools the cement clinker that is burning in the fuel oil.
- German Offenlegungsschrift DE 2 041 834 discloses a device for producing white cement, in which cement clinker is sintered in an upper chamber initially under highly reductive conditions in a rotary kiln subdivided by a permeable bulkhead into two sections, and subsequently discharged from the lower chamber is deterred.
- cooling water emerges from nozzles which are arranged in the rotary kiln housing to cool the fired cement clinker by spraying the cooling water directly onto the clinker.
- the division of the rotary kiln is problematic because the passages can easily clog in operation by sixteengebackene Zementklinkeranphaseufonne. In such a case, the rotary kiln can be damaged.
- German Patent DE 1 178 769 teaches a method of burning white cement. According to this patent specification, the idea is to spray the reducing agent and the water in close proximity to one another onto the cement clinker bed rolling in the rotary kiln in a region present at the end of the rotary kiln via a combined pipe for injecting reducing agent and water. It is important that the spray cones of the reducing agent and the water do not overlap. In this arrangement, the supply pipes are exposed in the rotary kiln and are immediately exposed to the chemically / physically aggressive environment of the rotary kiln.
- the object of the invention is to provide a plant for the production of cement clinker for the further production of white cement available, the robust and is reliable.
- the cement clinker is to be manufactured for the production of white ce- ment with high quality.
- the burner lance has at least one line for guiding cooling water, wherein the line for guiding cooling water in the area between the burner mouth and the end of the rotary kiln furnace opens and cooling water to the sintered cement clinker sprayed.
- At least one cooling water line is part of the burner lance itself.
- Burner lance and cooling water pipe are integrated.
- the burner lance thus provides the flame for heating the rotary kiln and at the same time it provides a cooling medium.
- the connection of the burner lance with the cooling water has several advantages.
- the production of white cement requires much higher energy input than the production of gray cement, because the necessary temperature for sintering the cement clinker due to the lack of iron oxide, which supports the sintering process in the production of gray cement by its action as a flux , does not exist.
- the higher energy input also means a higher thermal load on the burner itself, which is usually protected from the heat in the rotary kiln by a shroud with a refractory material, referred to in English as "Refractory”.
- the burner lance is cooled by the primary air and the fuel, both of which flow through the burner lance itself. If, as provided according to the invention, a cooling water line is provided as part of the burner lance itself, this at least one line for guiding cooling water causes cooling of the burner lance so that the burner lance has a longer service life during operation.
- Quenching the cement clinker still in the rotary kiln by water has the well-known advantage that the reductive environment in the rotary kiln itself can be better controlled than when cooling the cement clinker by atmospheric air outside the rotary kiln is the case.
- a reducing agent usually oil, heating oil or another combustible medium, including gas, as protective Use reducing agent. The result is thus the contradictory effect that the reducing agent is usually used by generating even more heat in the immediate vicinity of the coolant.
- the mouths between the burner mouth and the end of the rotary kiln are distributed raw.
- the lines for carrying cooling water are housed within the refractory shroud.
- a water pipe is created at the burner lance without refractory sheathing.
- the refractory sheathing which is usually made of a refractory refractory material, around the burner lance with a corresponding formwork cast.
- This very simple and inexpensive method of production is already suitable for use with the burner lance according to the invention.
- the at least one line for guiding cooling water is either part of the flow-guiding parts of the burner lance itself or is connected to it in a thermally conductive manner.
- the refractory material has as its essential function a very poor heat conduction.
- the cooling effect of the cooling water would therefore have little cooling effect on the burner lance when encapsulated in the castable refractory material (Refractory).
- Refractory castable refractory material
- the burner lance is movably mounted outside a Drehrohro- fenkopfgeperuses, whereby the depth at which the burner lance extends into the rotary kiln, variable is. Due to this adjustability, the plant can produce cement clinker for gray Portland cement or cement clinker for white cement in various configurations. If the burner lance is inserted deep into the rotary kiln, the burner lance in the part of the rotary kiln behind the burner mouth can cool the cement clinker and at the same time create a barrier to the reductive atmosphere.
- the cooling of the burner lance can be switched off.
- the cement clinker is not quenched in the rotary kiln, but dumped into a cooler following the rotary kiln on the material flow side, where the cement clinker is cooled with atmospheric air.
- This cooling air can then be passed as secondary air into the rotary kiln for recuperation of the radiator waste heat or, as tertiary air, past the rotary kiln into a material flow side of the rotary kiln. switched preheating and calcining be passed.
- the retraction of the burner lance thus lengthens the available rotary kiln length so that the cement clinker can be sintered to produce gray cement having a lower temperature but a somewhat longer residence time in the rotary kiln.
- the rotary kiln opens into a clinker cooler, below a Abschöff- opening of the rotary kiln, a flap is present, which releases or covers a clinker breaker, wherein the flap in the open state, the discarded from the rotary kiln Guides cement clinker on the clinker breaker, and in the closed state, the cement clinker discarded from the rotary kiln passes into the clinker cooler.
- the cement clinker will not pass through the clinker cooler.
- the cement clinker for the production of white cement clinker is ready for cooling when it is dropped from the rotary kiln, the temperature is about 250 ° C, that no further cooling before crushing is necessary.
- Cement clinker with a temperature of 250 ° C can easily be broken with a crusher.
- the final cooling can be done with atmospheric air, whereby the internal transport via conveyor belts cools the cement clinker to acceptable temperatures for storage in a clinker silo. A transport through a clinker cooler is therefore not absolutely necessary in the production of cement clinker for the further production of white cement.
- the still hot cement clinker for the production of gray cement is passed over the closed flap into the clinker cooler, where the clinker is cooled with atmospheric air.
- the cooler exhaust air can be used for recuperation.
- a hot gas generator heats cooling air from the radiator end or from the free atmosphere and conducts it into the radiator inlet housing, where the heated cooling air flows as secondary air into the rotary kiln and passes as tertiary air into other parts of the system. With the flap open, the cement clinker falls directly onto the crusher. However, any exhaust air on the rotary kiln may flow through the radiator housing, atmospheric air being drawn into the hot gas generator by the radiator.
- the amount of water introduced into the rotary kiln is very critical. If too little water is introduced, the barrier between the atmospheric air and the reductive environment in the rotary kiln collapses. The cement clinker is not cooled enough so that the cement clinker for the production of white cement has only a low quality. If, however, too much water is sprayed onto the cement clinker, the cement clinker on the surface can undergo a hydraulic reaction as the beginning of setting, which reduces the quality of the clinker. In addition, the temperature in the rotary kiln is unnecessarily reduced by excessive cooling, which drives the energy costs in the air and reduces the clinker yield.
- a control device controls the amount of cooling water, which flows through the line per unit time, which is provided for cooling the Zementklin- kers.
- the controlled system consists in this case of the measurement of the clinker temperature, which is thrown off the rotary kiln on the amount of water flowing per unit time in the rotary kiln. Temperatures in the range between 200 ° C and 300 ° C with a target temperature of about 250 ° C are suitable as the control temperature.
- the amount of water needed to cool the clinker can be calculated from the specific enthalpy of evaporation of water. An amount of 1 kg cement clinker with a heat capacity of about 1 kJ / kg / K (actually slightly less) requires approx.
- thermolysis of the cooling water occurs, the water requirement for cooling the cement clinker is reduced considerably because the thermolysis of the water is strongly endothermic. A thermolysis is therefore even desirable because the thermolysis of the cooling water on the one hand extracts heat from the cement clinker and recuperates heat in the area of the flame of the burner lance by reverse reaction.
- a further embodiment of the invention can be provided to remove air from a rotary kiln following clinker cooler, in particular from the rear part, in which the cooler exhaust air is around 100 ° C to 150 ° C.
- These cooler exhaust air which only carries small amounts of heat, is heated to approximately 300 ° C. to 350 ° C. by means of a hot gas generator and fed to the housing of the burner lance as additional primary air.
- This arrangement allows the vapors produced in the water cooling, can be withdrawn from the rotary kiln, without this the rotary kiln lacks the necessary supply air, which is needed for the operation of the heat exchanger and the rotary kiln following calciner as carrier air.
- the vapors produced by cooling the clinker with water can be removed from the kiln head and thus do not burden the kiln process. Nevertheless, enough combustion air can be supplied via the main burner.
- the preheated air can be used on the main burner with less or even without any supporting fuel such as natural gas or crude oil.
- additional fuel is also burned in the hot gas generator, through the optimization of the combustion chambers and the spatial separation but with an improved overall efficiency. With suitable process control, an ash-rich, but ignitable fuel such as lignite dust could be burned in the hot gas generator, the ash would then be separated via a cyclone before the hot gases are fed into the process.
- the burner cooling tube thermally less burdened, so that it is quite possible to work with relatively hot air.
- the cooling pipe can be efficiently cooled by means of a small amount of ambient air, which is sucked into the pipe through suitably dimensioned openings.
- FIG. 1 shows an illustration of a rotary kiln furnace head housing with a rotary kiln connected to the left, part of a cooler and burner lance according to the invention in a first configuration for the production of cement clinker for the further production of white cement,
- FIG. 2 shows an illustration of a rotary kiln furnace head housing with a rotary kiln connected to the left, part of a cooler and burner lance according to the invention in a second configuration for the production of cement clinker for the production of gray cement
- Fig. 3 shows an embodiment of the Drehrohrofenkopfgefits with H possessgaserzeu- ger, which is supplied to the burner housing as the primary air.
- FIG. 1 shows an illustration of a rotary tubular furnace head housing 10 with a rotary kiln 15 on the left, part of a clinker cooler 20 and burner lance 25 according to the invention in a first configuration for producing cement clinker for the further production of white cement.
- the movably mounted burner lance 25 is pulled out of the rotary kiln 15 as much as possible.
- the burner lance 25 is passed through the rotary kiln housing 10 and protrudes into the rotary kiln 15.
- the flame 30 emerging from the burner lance generates a temperature of about 1450 ° C.
- the still hot cement clinker dropped by the rotary straw 15 slips through the flap 50 acting as an inlet chute onto a cooling grate 60 on the right in the clinker cooler 20, where the cement clinker 45 is cooled by atmospheric air 65 flowing through the cooling grate 60 from below ,
- the heated radiator exhaust air 70 flows against the material flow direction indicated by arrow 75 in the direction of the rotary kiln 40 where the hot radiator exhaust 70 flows on the one hand into the rotary kiln 15 as secondary air 80 or as tertiary air 85 into a calciner, not shown here, through the tertiary air duct 90 flows.
- An existing here in Drehrohrofenkopfgepuruse 10 supply air line 95 is in this configuration shown here without function.
- FIG. 2 shows the identical plant for producing cement clinker in a second configuration shown here.
- the open flap 50 which is set in such a way that cement clinker 45 falling out of the rotary kiln 15, acts directly on a crusher 115 which blocks the cement clinker, which has already been quenched and cooled down to approximately 250 ° C. 45 minced.
- Below the crusher 115 a not essential for the invention conveyor belt is arranged, which removes the broken cement clinker 45.
- the burner lance 25 is guided into the rotary kiln 15 as far as possible via its movable mounting.
- the lines 110 for guiding cooling water are supplied with water in relation to the system configuration in FIG.
- This water fulfills several functions.
- a first function is cooling the burner lance, which is here far in the rotary kiln 15, and is therefore exposed to a high thermal load.
- a second function is the spraying of the cooling water onto the calcined crude meal 35, which is still about 1,400 ° C. to 1,450 ° C., and which is in the sintering process to cement clinker 45.
- cement clinker for the further production of white cement, it is important to use raw materials that are particularly low in iron (Fe), manganese (Mn), chromium (Cr) and titanium (Ti). Due to the aforementioned poverty, the melting point of the raw meal is significantly higher, namely by about 100 K, higher.
- the raw meal crystallizes to the C, A and S phases known in the field of cement science.
- This crystallization requires very rapid cooling so that in the very complex phase diagram of the raw raw meal 35 there are no other phases at higher temperature, which otherwise, at slower cooling, will not yield the desired C, A by thermodynamic control - and S-phases lead.
- the rapid cooling of the raw meal 35 prevents crystallization of the thermodynamically forming phases at other temperatures in the desired cement clinker 45, which on the one hand does not show the hydraulic properties of the cement clinker 45 and could also discolor the cement clinker 45.
- thermolysis Due to the presence of the catalytically highly effective raw meal 35 and / or cement clinker 45 granules, it can also happen that the cooling water undergoes a thermolysis with splitting of the water into molecular hydrogen and oxygen, which in addition to the pure water evaporation with a very high heat capacity, the raw meal 35 / the cement clinker 45 further draws considerable heat. Although it is known that water undergoes a noticeable thermolysis only from temperatures above 2,000 ° C. In the presence of catalytically active materials, however, the thermolysis can also take place at 900 ° C. by lowering the activation energy for the purpose of thermolysis. The thermolysis produces oxyhydrogen, ie a hydrogen (H 2 ) - oxygen (0 2 ) mixture.
- This blast gas is passed through the preheated hot air 120 which enters the rotary kiln housing 10 through a conduit 125 is strongly diluted and blown into the area of the flame 30 of the burner lance 25.
- the oxyhydrogen gas can also react again to water, as in a oxyhydrogen flame, or it can use the fuel to undergo a complex series of redox reactions as a combustion reaction. Since the gas in the rotary kiln 25 is very hot due to the flame 30 of the burner lance 25, the heat absorbed by the evaporation of the cooling water is not returned to the process by recuperation.
- the water vapor present in the area of the rotary kiln 15 between the rotary kiln furnace head 40 and the flame 30 displaces the atmospheric and cold air present from the outside of the cooler.
- the water vapor here forms a barrier between the reductive flame exhaust gases set by the combustion guide in the flame 30, which are deeper in the rotary kiln, and the atmospheric air in the clinker cooler 20.
- the hot air 120 supplied through the line 125 is already by the preheating with a corresponding flame oxygen poor and flows through the thermals in the rotary kiln 15, especially at the top of the rotary kiln 15 in the rotary kiln 15 inside. A portion of the heated hot air 120 flows as tertiary air 85 into the tertiary air duct 90.
- FIG. 3 shows an embodiment of the plant for the production of cement clinker for the further production of white cement is shown, in which in addition to the features shown in Figure 2 a line for radiator exhaust air 1 1 1 is provided seen, which comes from the rear of a clinker cooler ,
- This air has a temperature between about 100 ° C and 150 ° C and is brought by a hot gas generator 1 12 to a temperature of about 300 ° C to 350 ° C and fed as heated radiator exhaust air 1 13 of the primary air 105 ,
- the supply of the heated radiator exhaust air 1 13 of the primary air can be supplied directly or else be flowed into the burner lance housing, where it mixes with the flame at the end of the housing.
- the additional feed of the heated radiator exhaust air 1 13 in the primary air of Brennrs has the technical advantage that the vapors can be withdrawn from the rotary kiln, without the withdrawn air volume reduces the necessary carrier air for a calciner following the rotary kiln.
- Rotary kiln furnace head 110 pipe (cooling water) Cement clinker 111 Cooler exhaust air
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018108802.7A DE102018108802B3 (en) | 2018-04-13 | 2018-04-13 | Plant for the selective production of cement clinker for gray or white cement |
PCT/EP2019/058168 WO2019197195A1 (en) | 2018-04-13 | 2019-04-01 | System and burner lance for additionally producing white cement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3775742A1 true EP3775742A1 (en) | 2021-02-17 |
EP3775742B1 EP3775742B1 (en) | 2023-07-12 |
Family
ID=66102682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19716842.0A Active EP3775742B1 (en) | 2018-04-13 | 2019-04-01 | System and burner lance for additionally producing white cement |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3775742B1 (en) |
DE (1) | DE102018108802B3 (en) |
DK (1) | DK3775742T3 (en) |
WO (1) | WO2019197195A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102021210662A1 (en) | 2021-09-24 | 2023-03-30 | Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies Gmbh | Device and method for drying material and asphalt mixing plant with such a device |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3074705A (en) | 1960-09-27 | 1963-01-22 | Smidth & Co As F L | Rotary kiln and method of burning material therein |
DE1178769B (en) | 1960-09-27 | 1964-09-24 | Smidth & Co As F L | Method and device for burning white cement in a rotary kiln |
US3506250A (en) | 1968-09-23 | 1970-04-14 | Smidth & Co As F L | Rotary kiln and method for manufacture of white cement |
GB1434339A (en) | 1974-10-03 | 1976-05-05 | Smidth & Co As F L | Coolers for cooling granular or pulverous material |
US4461465A (en) | 1980-02-11 | 1984-07-24 | Exxon Research And Engineering Co. | Facsimile sheet feeding apparatus |
DE3521587C1 (en) | 1985-06-15 | 1989-02-02 | O & K Orenstein & Koppel Ag, 1000 Berlin | Process and system for producing white cement |
DE19622591A1 (en) | 1996-06-05 | 1997-12-11 | Heidelberger Zement Ag | Process for the material and thermal use of water, minerals and flammable residues for the production of Portland cement clinker |
US6228143B1 (en) * | 2000-01-18 | 2001-05-08 | The International Metals Reclamation Company, Inc. | Rotary thermal oxidizer for battery recycling and process |
US20050284347A1 (en) * | 2004-06-29 | 2005-12-29 | Cemex Inc. | Method of reducing cement kiln NOx emissions by water injection |
EP1932929B1 (en) * | 2005-10-05 | 2012-08-29 | JFE Material Co., Ltd. | METHOD OF ROASTING V, Mo AND Ni-CONTAINING MATTER, AND ROTARY KILN FOR ROASTING OF V, Mo AND Ni-CONTAINING MATTER |
EP2626628B1 (en) * | 2012-02-09 | 2014-04-09 | Linde Aktiengesellschaft | Firing of an industrial furnace and associated burner |
-
2018
- 2018-04-13 DE DE102018108802.7A patent/DE102018108802B3/en active Active
-
2019
- 2019-04-01 WO PCT/EP2019/058168 patent/WO2019197195A1/en active Application Filing
- 2019-04-01 EP EP19716842.0A patent/EP3775742B1/en active Active
- 2019-04-01 DK DK19716842.0T patent/DK3775742T3/en active
Also Published As
Publication number | Publication date |
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WO2019197195A1 (en) | 2019-10-17 |
EP3775742B1 (en) | 2023-07-12 |
DE102018108802B3 (en) | 2019-09-12 |
DK3775742T3 (en) | 2023-10-16 |
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