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, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L5/00—Solid fuels
  • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
  • C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E50/00—Technologies for the production of fuel of non-fossil origin
  • Y02E50/10—Biofuels, e.g. bio-diesel
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E50/00—Technologies for the production of fuel of non-fossil origin
  • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

• the invention relates to a process for the treatment of lignite for combustion and / or gasification in order to generate electricity, wherein the lignite wet lignite is first pre-broken and then comminuted in a grinder and then the milled coal is fed to a drying.
• Such a method is known for example from 196 18 880 A1.
• a rupture of the lignite wet lignite takes place on a grain size of about 50-150 mm.
• a foreign body balance of wood residues, xylitol contents, admixtures of pyrite, metal and non-metallic foreign bodies, etc . The FremdMechauss is a multi-stage fine grain processing downstream. In this case, for example, a multi-stage fine grinding with appropriate sieve classification is provided.
• the processed fine grain is fed to a fluidized bed dryer, in which inevitably process-related an internal post-shredding of lignite takes place.
• a subsequent screening of the drying coal downstream of the dryer and a subsequent grinding of the oversize particles takes place. It has been found to be energetically particularly favorable for the power plant process, the comminuted raw lignite in the manner described above in a fluidized bed dryer to dry and in dried form the
• Fluid bed dryers equipped with relatively close-packed heat exchangers can lead to significant operational problems that significantly affect the performance and efficiency of the process. Attempts have therefore been made to make both the pre-crushing of brown coal more effective, and to improve the foreign matter balance immediately after the pre-crushing.
• the invention is therefore based on the object to improve a method of the type mentioned in terms of the retention of foreign substances and / or foreign bodies.
• the object is achieved according to the invention by a method for the treatment of lignite for combustion and / or gasification for the purpose of generating electricity, wherein the lignite brown coal is first pre-broken and then comminuted in a grinder and then the milled coal is fed to a drying, the process itself characterized in that the milling device means for FremdMechausidos from the material flow are immediately downstream.
• the invention is new ways in terms of foreign body inventory. Unlike in the prior art, the invention provides for downstream adjustment of the foreign matter content of the grinding. Although a certain proportion of foreign bodies and foreign matter would be withstood in a screening in the sense of a Siebklasstechnik, but the screening is usually done with regard to the desired separation section so that the
• rescreening does not mean sieve classification in the true sense in which a particular separation cut within the grain fraction is desired. Rather, in the rescreening according to the invention, 100% of the brown coal should be in the sieve pass, i.e., this sifting is a control sieving.
• the brown coal is suitably ground to an average grain size of 0-2 mm.
• the lignite is subjected to their grinding a drying in a fluidized bed dryer.
• the lignite is comminuted to a mean grain diameter (D50) of a maximum of 1 mm.
• the subsequent screening is carried out using a screening device with a mesh size of at least 4 ⁇ 6 mm, preferably from about 6 ⁇ 10 mm to about 10 ⁇ 15 mm.
• the comminution of the brown coal is carried out in two stages using two series-connected grinding devices, wherein the screening (control screening) takes place behind the second comminution stage.
• the screening can be done by means of at least one ventilated and / or heated vibrating screen, which is connected downstream of the mill discharge.
• the vibrating screen can be designed and arranged so that it is adapted to the geometry of the M ⁇ hlenaustrages. The invention will be explained below with reference to an embodiment shown in the drawings.
• Figure 2 shows a part of the discharge from a coal mill with downstream
• Vibrating screen and downstream trough chain conveyor Vibrating screen and downstream trough chain conveyor.
• FIG. 1 shows only part of the coal processing of lignite for combustion in a boiler for generating steam.
• the raw lignite with a water content of up to about 65% usually leaves the open pit with a maximum piece size of, for example, 300 mm.
• the delivered from the open pit raw coal is pre-crushed by a crusher, not shown, to a grain size of, for example, 0-50 mm and fed via conveyor belts 1 one or more Rohkohlebunkern 2. Both in front of the crusher and behind the crusher, foreign matter retention is provided for the separation of foreign bodies such as metal parts or pieces of wood. Also, in the raw coal often larger amounts of more or less fused xylitol can be found.
• the raw lignite coal is from the raw coal bunker 2 via a
• the coal mill 5 may be formed, for example, in a known manner as a hammer mill or impact mill.
• the first coal mill 5 is a comminution of lignite, for example, to a Grain size between 0 and 10 mm.
• the first coal mill 5 can be followed directly by a second coal mill 6.
• the milled brown coal emerges with an average grain size of, for example, 0-2 mm.
• a control screen 7 is connected immediately downstream.
• the sieve passage of the control sieve 7 is fed to a trough chain conveyor 8, which directly or indirectly feeds a fluidized bed drier, not shown.
• the screen overflow of the control sieve 7 is completely out of the process.
• the screen overflow of the control screen 7 can also be subjected to a sighting, for example, to be able to withstand wood and xylitol from the process.
• the wood and / or xylitol are crushed as fibrous materials, for example, crushed in a cutting mill, and the process in crushed form.
• the control screen 7 is designed as a vibrating screen with a relatively large mesh size of for example 6 x 10 mm, so that it is ensured that the discharge from the second coal mill 6, as far as this is lignite, goes through 100% of the screen passage.
• control screen 7 is arranged in the form of a vibrating screen.
• control screen 7 is arranged in a screen housing 11, which is approximately gas-tight connected to the discharge chute 9 of the coal mill 6.
• the screen housing 11 is in turn connected with its Austragsschurre 12 to a designated 13 trough chain conveyor.
• the screen housing 11 is heated by means of air.
• an air connection 14 is provided via which the screen housing 11 is flushed with gas through the discharge chute 12 in the conveyor chain conveyor 8.
• the heating and flushing of the Screen housing with air or flue gas serves to prevent caking of the fine coal within the screen housing 11 and / or on the sieve bottom 10.
• the screen housing can be operated with a vacuum of 5-10 mbar.
• an air outlet on the housing of the trough chain conveyor 13 is designated.
• the screen housing 11 is provided with an open Siebaustritt 17 over which the screen overflow is withdrawn.
• the screen overflow can be promoted for example to a designated band or in a container provided for this purpose.

Landscapes

• Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Combined Means For Separation Of Solids (AREA)
• Disintegrating Or Milling (AREA)
• Solid Fuels And Fuel-Associated Substances (AREA)
• Crushing And Grinding (AREA)
• Drying Of Solid Materials (AREA)

Priority Applications (8)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (8)

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Citations (5)

Family Cites Families (6)

• 2008
  • 2008-11-24 AU AU2008364237A patent/AU2008364237B2/en not_active Ceased
  • 2008-11-24 US US13/130,645 patent/US8662426B2/en not_active Expired - Fee Related
  • 2008-11-24 RU RU2011125922/06A patent/RU2484375C2/ru not_active IP Right Cessation
  • 2008-11-24 CA CA2742713A patent/CA2742713C/en not_active Expired - Fee Related
  • 2008-11-24 WO PCT/EP2008/009925 patent/WO2010057512A1/de active Application Filing
  • 2008-11-24 CN CN2008801320620A patent/CN102224224A/zh active Pending
  • 2008-11-24 EP EP08875033.6A patent/EP2350239B1/de not_active Not-in-force
  • 2008-11-24 UA UAA201107958A patent/UA100931C2/uk unknown

Patent Citations (5)

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