Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B7/00—Hydraulic cements
  • C04B7/36—Manufacture of hydraulic cements in general
  • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
  • C04B7/44—Burning; Melting
  • C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
  • C04B7/4446—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes the fuel being treated in a separate gasifying or decomposing chamber, e.g. a separate combustion chamber

Definitions

• the present invention relates to a process for the pretreatment of charges contaminated with carbon carriers for use in clinker furnaces.
• From DE-C 35 33 775 is a plant for the production of cement clinker from raw meal using heat-containing
• EP 1 334 954 A1 shows and describes a further development of this plant in which the utilization of heat-value-containing waste materials in a separate rotary kiln is now used to preheat cement raw meal in this separate reactor. Again, it was recognized that in the pollination or combustion of waste and in particular also lumpy waste in a rotary kiln can not be guaranteed that uniform conditions for the thermal treatment are created and in particular the occurrence of temperature peaks is prevented, leading to unwanted solid caking in the Rotary kiln leads.
• the invention now aims to provide a method of the type mentioned, in which using known devices with only simple modifications of this device, the processing of, for example, petroleum-contaminated soils, soils, rocks, minerals or batches with low calorific value suitable for use in clinker furnaces. Specifically, the contaminated soils degraded near oilfields present a problem that could not be adequately solved by the known methods.
• the inventive method is essentially characterized in that the batches are placed in a reactor and heated or dried with gases that the heated gases are withdrawn at temperatures below 1250 0 C preferably 700-900 0 C and the heated or dried batch at temperatures between 500 0 C and 1000 0 C is applied separately, wherein the temperatures by a regulation of the fresh air supply, a water or water vapor feed, adjusted and maintained by controlling the feed rate of the charge and / or process gases, such as tertiary air and, if necessary, by combustion of fuels to stabilize the temperature distribution in the reactor and that the gases withdrawn from the reactor at least partially in a circle to the reactor recycled and / or a Vorkalzinierprocess and / or a preheating the clinker furnace are supplied.
• gases by a regulation of the fresh air supply, a water or water vapor feed, adjusted and maintained by controlling the feed rate of the charge and / or process gases, such as tertiary air and, if necessary, by combustion of fuels to stabilize the temperature distribution in the reactor and that
• the essential advantage of the method according to the invention is that the temperatures are now influenced by a much more extensive control to meet the most diverse starting materials and in particular the contaminated with carbon carriers batches.
• the regulation of the temperatures takes place not only by regulating the fresh air supply or by regulating the feed rate of the charge and / or process gases, such as tertiary air, but also, above all, additionally a possibility for the introduction of water or water vapor is provided in the reactor.
• Contaminated waters can also be disposed of with such a device, wherein at the same time a reforming of gases can be carried out in the interior of the reactor in order to obtain high quality fuel gases directly.
• the process according to the invention is carried out in such a way that the regulation of the temperatures with water is carried out using contaminated water, in particular contaminated with oil and / or hydrocarbons.
• the procedure according to the invention can be such that the charge is mechanically agitated in the reactor and, in particular, circulated by rotation of the reactor, earths, soils, rocks or minerals with a low calorific calorific value preferably being used as charge with carbon carriers.
• the temperature level in the additional reactor in which the carbonaceous contaminated batches are pretreated can be kept relatively low, since it does not depend on the combustion.
• the calorific value of the contaminated batches is usually too low. Rather, it is important in the invention to keep the temperature low enough to avoid caking and temperature peaks caused by local burns with certainty.
• the process according to the invention is carried out in this case so that the batch is discharged at temperatures of about 800 ° C.
• 1 denotes a rotary kiln for clinker production, which raw meal is fed via a line 2.
• the raw meal is mixed in a suspended gas scher warmed with cyclones 3 or calcined, the hot gases of the clinker furnace are fed via line 4 this Schwebegas139 (2004).
• the clinker leaving the rotary kiln 1 passes into a clinker cooler 5.
• the tertiary air withdrawn from the clinker cooler 5 returns via a first line 6 to the preheating or precalcining stage and thus to the suspended gas heat exchanger (cyclones 3), a subset via the line 7 a another rotary drum reactor 8 is supplied.
• This further rotary drum reactor 8 now has a large number of feed devices, wherein via the line 9 fresh air, via the line 10 water or water vapor, via the line 11 with Kohlenstoffträgem contaminated charge and the line 12 optionally further fuel to stabilize the temperature distribution can be supplied in the reactor 8.
• the hot process gases can be circulated through the ring line 13 v, in which case only a subset is recycled and surplus hot gases are withdrawn via line 14 and can be fed to the floating gas heat exchangers. Finally, via the line 15, the pretreated batches are discharged.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Processing Of Solid Wastes (AREA)
• Muffle Furnaces And Rotary Kilns (AREA)
• Gasification And Melting Of Waste (AREA)

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• 2006
  • 2006-09-14 AT AT0153306A patent/AT504193B1/de not_active IP Right Cessation
• 2007
  • 2007-09-07 NZ NZ576104A patent/NZ576104A/en not_active IP Right Cessation
  • 2007-09-07 WO PCT/IB2007/002574 patent/WO2008032160A2/de active Application Filing
  • 2007-09-07 US US12/310,895 patent/US20100095873A1/en not_active Abandoned
  • 2007-09-07 EP EP07825071A patent/EP2061730A2/de not_active Withdrawn
  • 2007-09-07 CN CNA2007800339589A patent/CN101535205A/zh active Pending
  • 2007-09-07 RU RU2009113826/03A patent/RU2009113826A/ru unknown
  • 2007-09-07 MX MX2009002767A patent/MX2009002767A/es active IP Right Grant
  • 2007-09-07 BR BRPI0716806-3A2A patent/BRPI0716806A2/pt not_active Application Discontinuation
  • 2007-09-07 CA CA2663617A patent/CA2663617C/en active Active
  • 2007-09-07 AU AU2007297289A patent/AU2007297289B2/en not_active Ceased
• 2009
  • 2009-04-14 CO CO09037576A patent/CO6170354A2/es active IP Right Grant

Non-Patent Citations (1)

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