Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • C10L9/00—Treating solid fuels to improve their combustion
  • C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
  • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
  • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10F—DRYING OR WORKING-UP OF PEAT
  • C10F5/00—Drying or de-watering peat
  • C10F5/06—Drying or de-watering peat combined with a carbonisation step for producing turfcoal

Definitions

• This invention is based on the method for the production of brown coal coke using the thermal reprocessing of brown coal by high-temperature carbonisation, in the absence of air in the single technological stage.
• Brown coal has been considered, and in the literature was previously referred to, as a non-caking material.
• low-tempefattire ⁇ carbonisation (low-temperature .baking)! l ⁇ f!. brown
• icoali .using final temperatures ranging between 580 to 600 0 G low-temperature coke is produced, which is characterised by its high reactivity and its tendency to spontaneous combustion (i.e. freshly produced material spontaneously oxidising in air).
• the produced combustible matter is fine-grained, soft and friable and has a high ash content. With increasing of grain size the ash content also increases from 15 to 35%; this is accompanied by a decline in its total heating value.
• the second method for the preparation of high-temperature coke, from brown coal is also indirect and it is carried out technologically in two steps.
• the pressed briquettes are carbonised at high temperature between 900 to 1200 0 C. This technological process permits the brown coal coke production in two technological steps.
• the Patent No. 236540 describes the method for improving of caking of weakly-coking coal used for the production of metallurgical coke, which is based on the fact that aluminium oxide, in the form of a powder with grain-size under 1 mm, in quantity from 0.05 to 0.5% by weight, is added as a catalyst to the raw coal prior to its coking. This method, however, is primarily focused on weakly-caking hard coal.
• Brown coal of a suitable quality is brought, by crushing and grinding, to a grain-size smaller than 0.25 mm.
• the resulting mixture is moistened, by the addition of process water, to a final content of total water ranging between 10 to 25% by weight, and homogenised by simultaneous stirring.
• the mixture of brown coal, with its modified grain size, moistened and homogenised is placed into the retort, in which it is gradually compacted.
• the retort is closed and placed into a pyrolysis furnace where the content is indirectly heated to a final internal temperature of the retort ranging between 950 to 1300°C.
• This temperature is then kept for 2 hours or more, depending on the geometry and other parameters of the coking retort.
• the chemical-physical conversion of the brown coal matter and also its coking take place in the absence of air.
• the product of this conversion is high-temperature brown coal coke, produced in a single technological step.
• the qualitative parameters of charging brown coal are shown in Table No. 1.
• the charge of brown coal with grain-size adjusted to below 0.25 mm, moistened to 12.6% of total water was charged and compacted into a cylindrical retort, which was subsequently placed into a pyrolysis furnace and heated with the temperature gradient of 9.95 0 C . min "1 until it reached an internal final temperature of the charge of 1050 0 C.
• the final temperature of the charge was kept for the following two hours.
• the coke was moved from the retort having the surface temperature of 400 0 C (the internal temperature of the coke core ranged between 500 and 700 0 C).
• the brown coal coke produced in this manner, at this surface temperature is not subject to spontaneous combustion.
• the qualitative parameters of the brown-coal coke are defined in Table No. 2
• the produced brown coal coke is grey-black, matte, lumpy and non-brittle. It has a small surface area, which amounts to 1.04 m 2 . g "1 and 15.2% of the developed adsorption pores ranging in interval size between 44 and 65 nm.

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• Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Combustion & Propulsion (AREA)
• Solid Fuels And Fuel-Associated Substances (AREA)
• Coke Industry (AREA)

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Citations (5)

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• 2008
  • 2008-11-14 CZ CZ20080728A patent/CZ302969B6/cs not_active IP Right Cessation
• 2009
  • 2009-11-10 WO PCT/CZ2009/000134 patent/WO2010054607A1/en active Application Filing

Patent Citations (5)

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