EP2542346B1 - Verfahren und anlage zur kohlenvermahlung im inertbetrieb oder im nicht inerten betrieb - Google Patents

Verfahren und anlage zur kohlenvermahlung im inertbetrieb oder im nicht inerten betrieb Download PDF

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Publication number
EP2542346B1
EP2542346B1 EP11761498.2A EP11761498A EP2542346B1 EP 2542346 B1 EP2542346 B1 EP 2542346B1 EP 11761498 A EP11761498 A EP 11761498A EP 2542346 B1 EP2542346 B1 EP 2542346B1
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EP
European Patent Office
Prior art keywords
classifier
coal
hot gas
coal dust
gas generator
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EP11761498.2A
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German (de)
English (en)
French (fr)
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EP2542346A1 (de
Inventor
Silke Schlegel
Gerhard Salewski
Jürgen WÖLK
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Loesche GmbH
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Loesche GmbH
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Priority to PL11761498T priority Critical patent/PL2542346T3/pl
Publication of EP2542346A1 publication Critical patent/EP2542346A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/34—Passing gas through crushing or disintegrating zone gas being recirculated to crushing or disintegrating zone

Definitions

  • the invention relates to a method for Kohlenvermahlung in inert or non-inert operation according to claim 1 and a coal grinding plant in the inert or non-inert operation according to claim 9.
  • the invention is fundamentally suitable for all coal grinding plants in which raw coal is ground in the inert mode or in the air mode to coal dust.
  • Coal grinding plants are used in a variety of industries, such as hot gas production plants, fluidized bed combustion plants and coal gasification plants.
  • Coal milling is also used in the cement industry in the production of cement and in the steel and metallurgical industry and in colorful metallurgical processes which have PCI (Pulverized Coal Injection) systems.
  • DE 36 39 206 C1 is a method for controlling a roller mill for producing pulverized coal for pulverized coal firing and in US 4597537 A a vertical mill, which can be used inter alia for coal grinding and is directed to the improvement of the visual process is described.
  • process and plant can be used for novel power plant technologies, such as the oxycoal process.
  • process and plant are also suitable for the operation of hot gas generators and briquette production.
  • coal briquettes For the production of coal briquettes are so-called "young coal”, ie soft lignite, hard lignite and subbituminous coal with a water content of about 10% to about 75% and a content of volatile components of about 35% to about 60 in the rule % (i.waf).
  • young coal ie soft lignite, hard lignite and subbituminous coal with a water content of about 10% to about 75% and a content of volatile components of about 35% to about 60 in the rule % (i.waf).
  • a binderless briquetting method in which already crushed, moist fine coal using a task conveyor belt together with already dried fine coal and preheated fines from a separator for a briquette press above a gas mixing chamber of a hot gas generator and then given an entrained flow drying pipe and in a reducing or inert atmosphere is heated to 25 ° to 200 ° C. After a cyclone, in which the fine coal is separated, this is abandoned via a feed compressor of the briquetting press. The inert gas is given in proportions as the return gas of the gas mixing chamber and the burner of the hot gas generator. The entire system is driven at overpressure and there is a heat exchange between the briquettes or crushed briquettes with the wet fines before drying in the entrained flow dry tube.
  • the aforementioned Binderless Coal Briquetting Process (BCB) is modified so that the fine coal dried in the hot air generator-fed entrained air dryer is separated in a cyclone battery into a coarser, briquettable grain belt and into a fine material.
  • the drying gas is discharged.
  • the fines are fed to the burner of the hot gas generator as fuel under overpressure, and the hot gases generated in the hot gas generator reach the entrained flow dryer.
  • Statements on the grain size of the fine material and a Feinstkornanteil are not made.
  • the proportion of very fine grain or the grain structure has an effect on the density, compressibility, etc. and can significantly reduce the quality of the briquettes made therefrom.
  • the invention has for its object to provide a method and plant for Kohlenvermahlung in inert or air operation, which energy efficient to ensure the provision of coal dust in a particular use of grain size and at the same time the production of hot gases for the grinding-drying.
  • a basic idea of the invention can be seen in that pulverized coal produced in a grinding drying and separated from the drying and carrier gases in a separating unit is at least partially fed to a sifter in order to separate fine dusts or a finest grain fraction from the pulverized coal as the ground product by sighting, and then to use this finest grain fraction for the provision of the necessary heat for the grinding drying process and thus to save other energy sources, in particular precious energy sources, such as natural gases, oils, synthesis gases.
  • this subsequent screening process is decoupled from the gas-conducting process, in particular in the mill and in the separation unit.
  • the decoupling of the visual process from the gas-conducting process is in particular an advantage in terms of safety.
  • the fine grain fraction separated from the ground product in a static or mechanical separator is used for combustion in a hot gas generator for solid fuels in order to provide the drying energy required for the grinding drying process.
  • the fuel for producing the hot drying and carrier gases required in the grinding drying process is withdrawn directly from the mill drying cycle.
  • a separate fuel supply from the outside, which requires additional transport and / or storage facilities is avoided. Since the fine coal from the process of coal grinding is used even in the hot gas generator, also eliminates the need for an external fuel supply pre-drying and processing of external coal, resulting in lower energy consumption.
  • the finest grain fraction of the pulverized coal separated according to the invention in the mechanical or static classifier can be separated with a particle size required for a solid fuel burner of a hot gas generator.
  • the particle size of the pulverized coal fine grain fed to the solid fuel burner of a hot gas generator is about 10% R90 ⁇ m.
  • the use of solid fuels in a hot gas generator is determined by the parameters of grain buildup, volatiles content, and ash content of the lignite or coal used.
  • High ash contents, for example up to 45%, can lead to complications in the combustion process due to the associated lower calorific value why measures must be taken to ensure appropriate flame training.
  • the fine grain fraction separated in the classifier has a fineness in the range of about 50% R90 ⁇ m to about 1% R90 ⁇ m.
  • d 50 value which should be 10 to 30 microns with a content of volatiles in the coal of about 25 to 30%. With a higher proportion of volatiles, the particle size distribution can become coarser.
  • Hot gas generator with a solid fuel burner which is fired with dust-like fuels and is also referred to as a dust burner, are known and, for example, in DE 197 06 077 A1 and DE 197 25 613 A1 described.
  • a hot gas generator in which pulverized coal, for example lignite dust, is burned.
  • the coal dust is mixed with combustion air in fluidized form to produce hot gases of 200 ° C to 900 ° C.
  • the pulverized coal fine grain can be fed to a pulverized coal burner of a hot gas generator with a burner muffle and a downstream perforated jacket.
  • the perforated jacket consists of several perforated plate cylinder sections.
  • the resulting in the separation unit gas is fed as a return gas at about 100 ° C the hot gas generator and passes through an annular channel of the hole shell and annular openings and holes in the hole shell (LOMA) in the flue gas stream of the LOMA combustion chamber ( DE 197 06 077 A1 ) and can be heated to a temperature in the range of 150 ° C to over 700 ° C.
  • LOMA combustion chamber with a solid fuel burner ensures compliance with the legally regulated limit values for CO and NO x in gases that are proportionately discharged to the environment.
  • a static or mechanical classifier in which a secondary circuit is avoided, can be preferably used under safety aspects.
  • the "gearless mechanical separator" used in the BULLETIN 774 R of the Williams Patent Crusher & Pulverizer Company, USA, and in US Pat US 2,913,109 A. is described.
  • fan blades rotate and produce an ascending airflow in which the fines separated by rotary screens support the top of a divider panel and fall down the exterior housing wall to a fines effluent while the coarse grain removed from the fines falls down comes to a coarse material discharge. This sifter only requires a small air purge fan.
  • the sighting can thus be adjusted according to the requirements of the desired grain size of the finest grain of the pulverized coal.
  • the device is the object by a plant for coal grinding in inert or non-inert operation with a mill to carry out a mill drying and production of coal dust and with a separation unit for separating the pulverized coal from the gas and with a hot gas generator with solid fuel burner for heating the return gas and production of hot gases for the mill drying achieved in that after the separation unit, a separator for separating Feinstkorn from the pulverized coal and a silo for receiving the separated Feinstkorns and a connecting line with a removal device and a metering device for the Feinstkorn for supply to the solid fuel burner of the hot gas generator are arranged.
  • an air flow mill is used, in which the grinding-drying can be performed.
  • roller mills, spherical roller mills, hammer mills and ball ring mills can be used.
  • a hammer mill can be used if a product with a larger grain size is desired, which is advantageous, for example, in briquette production.
  • vertical air flow roller mills are advantageous because they can grind the coals to ⁇ 30% R90 ⁇ m.
  • a filter such as a bag filter, or a cyclone or a cyclone battery can be used.
  • a rotary valve and a corresponding transport device a defined proportion of the resulting in the separation unit pulverized coal are supplied to the separator for separating the Feinstkorns for the hot gas generator.
  • the pulverized coal not supplied to the separator passes via a conveyor to the intended place of use or for further processing, for example to a briquette press, a PCI system or coal gasification.
  • the inventive method and the system according to the invention can be used in coal gasification plants, PCI plants in the steel and metallurgical industry and in colorful metallurgical processes and in general heat engineering plants.
  • the synthesis gas produced in the coal gasification is used in the energy-producing industry and also increasingly in the petrochemical industry. So far, synthesis gas is split off as energy carrier for the grinding-drying, resulting in consumptions between 10 and 30 MW (about 3300 m 3 N / h to 11,000 m 3 N / h, calorific value: about 11,000 kJ / m 3 N ) represents considerable loss for the actual application.
  • the use according to the invention of a proportion of the pulverized coal produced for hot gas production is therefore advantageous in economic terms.
  • blast furnace gas is being used more and more frequently in power plants specially built for this purpose. Consequently, the use of the self-produced pulverized coal for the production of hot gas can also be advantageously used in this industry.
  • the coal grinding in the inert mode takes place in a mill 5, which is a hammer mill in this example.
  • moist, pre-broken coal passes through a conveyor 1 with magnetic separators, a Hosenschurre 2 and a bunker 3 with screw bottom 4, which also acts as a metering device.
  • the supplied moist raw coal may have a temperature in the range of about -20 ° C to about + 20 ° C and a humidity in the range of 10% to 75%.
  • hot gases 8 from a hot gas generator 12 having a temperature of about 450 ° C. are fed to the mill 5.
  • a separation unit 6 which is a bag filter in this embodiment, respectively.
  • the pulverized coal 14 separated from the drying and carrier gases reaches a conveying device 7, for example a discharge screw, and is fed to further processing in a briquetting press (not shown).
  • this classifier 10 is a mechanical or static classifier, which is suitable to separate from the partial stream 15 of the pulverized coal 14 a very fine grain fraction 20, which in the solid burner of the hot gas generator 12 can be burned.
  • the fineness can be approx. 50% R90 ⁇ m to approx. 1% R90 ⁇ m.
  • the finest grain fraction 20 passes after the separator 10 into a fine grain silo 9 and from here via a rotary valve 21 and a metering unit 22 in a supply line 23 to the hot gas generator 12 and to its solid fuel burner.
  • the coarse grain reaches a conveyor 19 and can be supplied together with the pulverized coal 14 from the separation unit 6 of the briquetting device (not shown).
  • the hot gas generator 12, the separated in the separation unit 6 process gases 11 are at least proportionally supplied as return gases 25.
  • the hot gas generator 12 is provided with a LOMA combustion chamber, and in this combustion chamber, the return gases 25 are heated from a temperature of about 100 ° C to about 700 ° C and then fed to the mill 5 as a drying and carrier gas.
  • the entire system is driven under vacuum.
  • the oxygen content of the inert or reducing drying and carrier gases 8 is at most 12%.
  • the safety-related CO and O 2 values of the process gas within the plant are complied with.
  • Part of the separated in the separation unit 6 gases 11 is discharged through a fireplace (not shown) in the environment.
  • Self-inert grinding plants which should not be operated as a separate coal refining plants as part of a composite plant and, for example, do not have nitrogen as in the steel and metallurgical industry from air separation plants available, must provide these gases by purchase. This requires storage capacities and separate equipment that weighs on the economics of the process.
  • the required volume flows of inert gas are considerable (several 100 m 3 / h depending on the size of the system).
  • For normal operation can be an inert gas production be integrated into the overall process.
  • There are, for example, gas or oil operated boiler plants whose heat can be used for heating purposes of buildings and for hot water treatment.
  • the resulting exhaust gas has an O 2 content of 1 to 2% and is therefore very well suited for the inerting of the system in the start-up process and for shutdown and emergency stop.
  • the required redundancy can be achieved via CO 2 in bottle batteries.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Crushing And Grinding (AREA)
EP11761498.2A 2010-09-02 2011-08-23 Verfahren und anlage zur kohlenvermahlung im inertbetrieb oder im nicht inerten betrieb Active EP2542346B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11761498T PL2542346T3 (pl) 2010-09-02 2011-08-23 Sposób i instalacja do mielenia węgla w inercyjnej atmosferze albo w nieinercyjnej atmosferze

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010036176A DE102010036176A1 (de) 2010-09-02 2010-09-02 Verfahren und Anlage zur Kohlenvermahlung im Inertbetrieb oder im nicht inerten Betrieb
PCT/EP2011/004233 WO2012028273A1 (de) 2010-09-02 2011-08-23 Verfahren und anlage zur kohlenvermahlung im inertbetrieb oder im nicht inerten betrieb

Publications (2)

Publication Number Publication Date
EP2542346A1 EP2542346A1 (de) 2013-01-09
EP2542346B1 true EP2542346B1 (de) 2013-12-04

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EP11761498.2A Active EP2542346B1 (de) 2010-09-02 2011-08-23 Verfahren und anlage zur kohlenvermahlung im inertbetrieb oder im nicht inerten betrieb

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Country Link
US (1) US20130146686A1 (da)
EP (1) EP2542346B1 (da)
KR (1) KR101622582B1 (da)
CN (1) CN103052447B (da)
AU (1) AU2011297994B2 (da)
CA (1) CA2792947A1 (da)
CO (1) CO6630101A2 (da)
DE (1) DE102010036176A1 (da)
DK (1) DK2542346T3 (da)
EA (1) EA020075B1 (da)
ES (1) ES2447849T3 (da)
NZ (1) NZ602310A (da)
PL (1) PL2542346T3 (da)
PT (1) PT2542346E (da)
TW (1) TWI441686B (da)
WO (1) WO2012028273A1 (da)
ZA (1) ZA201206728B (da)

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CN102690687B (zh) * 2012-06-18 2016-12-21 天津渤海化工有限责任公司天津碱厂 一种改进的煤粉输送方法
US9427744B1 (en) * 2013-01-17 2016-08-30 Calgon Carbon Corporation Methods for processing carbonaceous materials
CN103447137B (zh) * 2013-08-09 2015-10-07 陕西煤业化工技术研究院有限责任公司 一种安全高效的煤粉制备系统及方法
CN104689897B (zh) * 2014-04-01 2017-04-26 上海化学工业区升达废料处理有限公司 一种焦炭的自动研磨系统和研磨方法
CN103949322B (zh) * 2014-05-14 2017-03-29 中材（天津）粉体技术装备有限公司 一种镍渣粉磨系统及其生产工艺
WO2017008863A1 (de) * 2015-07-16 2017-01-19 Loesche Gmbh Verfahren und anlagenanordnung zum aufbereiten und aktivieren eines rohstoffes
LU92916B1 (en) * 2015-12-17 2017-07-13 Wurth Paul Sa Grinding and drying plant
CN107649275A (zh) * 2017-10-27 2018-02-02 四川省洪雅青衣江元明粉有限公司 一种采用电干燥元明粉的装置及方法
CN115746926A (zh) * 2022-12-29 2023-03-07 神华准能资源综合开发有限公司 纳米化煤粉、纳米碳氢燃料及其制备方法
CN115746932A (zh) * 2023-01-09 2023-03-07 羚羊环保科技有限公司 一种褐煤烘干提质及制粉生产工艺

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US20130146686A1 (en) 2013-06-13
EA201101157A1 (ru) 2012-03-30
ZA201206728B (en) 2013-06-26
KR20130128306A (ko) 2013-11-26
WO2012028273A1 (de) 2012-03-08
DE102010036176A1 (de) 2012-03-08
CA2792947A1 (en) 2012-03-08
CN103052447A (zh) 2013-04-17
EA020075B1 (ru) 2014-08-29
CO6630101A2 (es) 2013-03-01
NZ602310A (en) 2013-11-29
TWI441686B (zh) 2014-06-21
TW201213015A (en) 2012-04-01
EP2542346A1 (de) 2013-01-09
AU2011297994B2 (en) 2013-08-01
AU2011297994A1 (en) 2012-11-01
CN103052447B (zh) 2014-12-03
ES2447849T3 (es) 2014-03-13
PL2542346T3 (pl) 2014-05-30
DK2542346T3 (da) 2014-02-24
PT2542346E (pt) 2014-02-25
KR101622582B1 (ko) 2016-05-31

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