EP0222730A2 - Procédé de séchage du charbon brun riche en eau - Google Patents

Procédé de séchage du charbon brun riche en eau Download PDF

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Publication number
EP0222730A2
EP0222730A2 EP86890287A EP86890287A EP0222730A2 EP 0222730 A2 EP0222730 A2 EP 0222730A2 EP 86890287 A EP86890287 A EP 86890287A EP 86890287 A EP86890287 A EP 86890287A EP 0222730 A2 EP0222730 A2 EP 0222730A2
Authority
EP
European Patent Office
Prior art keywords
water
fine grain
coal
separated
fed
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.)
Withdrawn
Application number
EP86890287A
Other languages
German (de)
English (en)
Other versions
EP0222730A3 (fr
Inventor
Michael Dipl.-Ing. Schweizer
Jaroslav Dipl.-Ing. Dr. Fohl
Gero Tessmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine AG
Original Assignee
Voestalpine AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0222730A2 publication Critical patent/EP0222730A2/fr
Publication of EP0222730A3 publication Critical patent/EP0222730A3/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a method for drying water-rich lignite, in which the coal to be dried is sieved before a saturated steam treatment and fine grain is separated off and the sieve overflow with a grain size of less than 300 mm is treated with saturated steam and dried.
  • lignite is dried under a saturated steam atmosphere with pressures of 10 to 40 bar and temperatures of 180 to 250 ° C. 300 to 800 l of heavily polluted water are produced per ton of raw coal.
  • the amount of water generated depends on the water content of the raw coal and the desired degree of drying of the dry coal. It is already known to use such water obtained from the process to brew coal for the purpose of preheating.
  • the process water used for over-spraying itself has a solids content of about 5 to 40 g / l, this solids content essentially containing extremely fine grain.
  • the solids content contains only about 10% with grain sizes greater than 50 ⁇ , about 50% of the solids content has a grain size less than 10 ⁇ .
  • humic acids in amounts of 40 to 150 mg / l and phenols in amounts of 5 to 30 mg / l are present in this process water, so that the cleaning of process water of this type subsequently becomes relatively complex.
  • the present invention now aims to leave the process economy and, in particular, to reduce the effort for cleaning the wastewater arising in the process while improving the degree of drying.
  • the invention consists essentially in that the coal to be dried is overbrown with hot water and preheated before the separation of fine grain and that the separated fine grain fraction and the hot water are subjected to an adsorption stage, whereupon the solids are separated from the liquid phase. Because the fine grain and hot water separate the adhesive grain and other, especially hot water-soluble, wastewater-polluting substances prior to introduction into the drying reactor, the Flauerner drying can be carried out more effectively and more quickly.
  • this separated fine grain being subjected to an adsorption stage, in particular over a period of at least 1 minute, preferably 2 to 5 minutes, it is possible to use this coal grain discharged from the drying process to carry out particularly simple and extremely effective adsorption of pollutants in the waste water , which makes subsequent wastewater treatment much easier.
  • the process according to the invention is advantageously carried out in such a way that fine grain with a maximum grain size of 5 mm, preferably 1 mm, is separated off.
  • the adsorption stage can be carried out in a reactor, to which additional adsorbents may be added.
  • adsorption reactor With such an adsorption reactor, it is readily possible to remove phenols and other organic substances directly, as a result of which the dissolved portion of the dirt load in the waste water is reduced.
  • the Fine fraction of raw coal helps to reduce residual pollution due to its adsorption properties.
  • the adsorption effect can be improved by extending the reaction time, changing the flow conditions, and also by adding, for example, coal dust.
  • the slurry of a preferably multi-stage is then added to this adsorption stage Subjected to flocculation and after sludge separation a sludge dewatering.
  • the solids can be separated off in the process in a simple manner, if necessary after thickening by centrifuging, the solids separation being able to comprise conventional thickeners, lamella thickeners, electrolytic flotation cells or cyclones.
  • CaO, Ca (OH) 2, FeS04 or polyelectrolytes can be used as flocculants.
  • the addition of such flocculants significantly increases the settling speed, so that the thickening apparatus can be significantly reduced.
  • the solids concentration easily reaches values above 300 g / l and can be carried out in several stages.
  • disc filters, drum filters or belt presses can of course also be used to separate the solids.
  • the solids obtained can then be incinerated, in particular to produce saturated steam, the calorific value of the solid depending on the type of coal and ash content being approximately 1800 to 2500 Kcal / kg.
  • the wastewater remaining after the solids have been separated can be separated in further stages depending on the requirements cleaned, for which it is particularly advantageous to proceed in such a way that the liquid phase obtained in the solids separation is passed through a filter, in particular a sand filter, and the rinsing water is fed to the flocculation.
  • a filter in particular a sand filter
  • backwashing devices are usually used in order to remove residual suspended matter and to clean the filter.
  • cleaning with adsorber resins is recommended, followed by treatment with activated carbon, which is advantageously used as a final cleaning stage.
  • treatments with ion exchangers for the production of boiler feed water for the drying steam can be used with advantage.
  • the eluates of the adsorber resins and the used activated carbon can be fed together with the dewatered sludge to the combustion for steam generation.
  • the cleaned water can at least partially be returned to the sand filter as rinsing water or be sent to a biological cleaning system.
  • the process wastewater is cleaned in operation in a manner that is simple and easy to maintain, while at the same time improving the energy balance of coal drying.
  • a system according to the invention is shown diagrammatically in the drawing.
  • raw coal is fed in, hot waste water being drawn off from the coal drying reactor 2 via a line 3 for overflowing the raw coal for the purpose of preheating the same.
  • the over-brewed raw coal passes to a sieve 4, in which fine-grain fractions are underneath 5 mm, preferably less than 1 mm, are separated and only the grain fractions between 5 and 300 mm or 1 and 50 mm are fed to the coal drying 2.
  • the fine grain fraction subsequently passes into an adsorption reactor 5. Additional adsorbents such as activated carbon can be fed to the adsorption reactor 5.
  • the slurry brought out of the adsorption reactor is fed to a flocculation reactor 6, to which flocculants are metered in from a corresponding metering device 7.
  • a renewed addition of flocculant from a corresponding metering device 7 can subsequently be carried out again, whereupon the slurry is subjected to a solid separation 8.
  • the solids are then transferred to a sludge dewatering 9, whereas the liquid phase is fed to a sand filter 10.
  • a part of the filtrate flowing out of the sand filter can be used for backwashing the solids from the sand filter 10 and can be returned to the flocculation reactor 6 via a line 11.
  • a filtrate from the sludge dewatering can be returned to the flocculation reactor 6 via a line 12.
  • the dewatered sludge reaches a combustion stage 13, in which steam for the coal drying 2 can be produced.
  • the corresponding steam line is designated 14.
  • the filtrate leaving the sand filter is subjected to further purification by means of adsorber resins at 15, after which purification by means of activated carbon can be carried out at 16.
  • the eluates resulting from the regeneration of the adsorber resins and the used activated carbon can subsequently also be burned in the incinerator 13, the liquid medium leaving the activated carbon filter already being described as extremely pure.
  • the pure water can already be drained into a receiving water via line 18.
  • a partial flow of the purified water can be added to the purified water after the solids separation 8 via a ring line 19.
  • the dry coal discharge is indicated schematically at 20 and the ash discharge from the incinerator is indicated at 21.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Sorption (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
EP86890287A 1985-11-08 1986-10-23 Procédé de séchage du charbon brun riche en eau Withdrawn EP0222730A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3260/85 1985-11-08
AT0326085A AT388170B (de) 1985-11-08 1985-11-08 Verfahren zum trocknen von wasserreichen braunkohlen

Publications (2)

Publication Number Publication Date
EP0222730A2 true EP0222730A2 (fr) 1987-05-20
EP0222730A3 EP0222730A3 (fr) 1988-03-02

Family

ID=3547831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86890287A Withdrawn EP0222730A3 (fr) 1985-11-08 1986-10-23 Procédé de séchage du charbon brun riche en eau

Country Status (6)

Country Link
US (1) US4741837A (fr)
EP (1) EP0222730A3 (fr)
AT (1) AT388170B (fr)
AU (1) AU6493786A (fr)
DD (1) DD250365A5 (fr)
YU (1) YU186286A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5071447A (en) * 1989-10-31 1991-12-10 K-Fuel Partnership Apparatus and process for steam treating carbonaceous material
US5547548A (en) * 1994-07-18 1996-08-20 Tek-Kol Pyrolysis process water utilization
US5681284A (en) * 1994-10-31 1997-10-28 Glenn Herskowitz Infusion pump with tube spike holder
US5711769A (en) * 1995-09-08 1998-01-27 Tek-Kol Partnership Process for passivation of reactive coal char
CN102358649A (zh) * 2011-09-19 2012-02-22 李柏荣 一种褐煤提质污水的处理工艺
CN103395941B (zh) * 2013-08-09 2014-12-10 中国矿业大学(北京) 一种褐煤提质冷凝水回收利用系统

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395334A (en) * 1967-06-15 1968-07-30 Alnor Instr Co Condition responsive power control circuit including a passive element charging circuit
US3763040A (en) * 1971-08-13 1973-10-02 Environmental Protection Agenc Processes for reducing the organic-carbon content of water contaminated with organic compounds by continuous countercurrent multistage treatment with activated carbon
DE2947765C2 (de) * 1978-11-28 1985-09-19 Koei Chemical Co., Ltd., Osaka Verfahren zur Gewinnung von Phenolen aus wäßrigen Lösungen
FR2499544A1 (fr) * 1981-02-06 1982-08-13 Rhone Poulenc Sa Procede de recyclage d'eaux usees
JPS57162691A (en) * 1981-03-31 1982-10-06 Electric Power Dev Co Ltd Treatment for waste water of brown coal dehydration
US4507208A (en) * 1983-06-30 1985-03-26 Drilling Waste, Incorporated Process for handling waste from oil well operations
EP0155927B1 (fr) * 1984-03-21 1988-07-27 VOEST-ALPINE Aktiengesellschaft Installation de séchage de lignite à haute teneur en eau

Also Published As

Publication number Publication date
ATA326085A (de) 1988-10-15
AT388170B (de) 1989-05-10
US4741837A (en) 1988-05-03
YU186286A (en) 1988-06-30
AU6493786A (en) 1987-05-14
DD250365A5 (de) 1987-10-08
EP0222730A3 (fr) 1988-03-02

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Inventor name: TESSMER, GERO