EP0081624A1 - Verfahren und Vorrichtung zum Verbrennen von feuchten bituminösen Schiefern mit geringer Heizkraft - Google Patents

Verfahren und Vorrichtung zum Verbrennen von feuchten bituminösen Schiefern mit geringer Heizkraft Download PDF

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Publication number
EP0081624A1
EP0081624A1 EP82104767A EP82104767A EP0081624A1 EP 0081624 A1 EP0081624 A1 EP 0081624A1 EP 82104767 A EP82104767 A EP 82104767A EP 82104767 A EP82104767 A EP 82104767A EP 0081624 A1 EP0081624 A1 EP 0081624A1
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EP
European Patent Office
Prior art keywords
grains
combustion chamber
combustion
grinding
shales
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.)
Granted
Application number
EP82104767A
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English (en)
French (fr)
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EP0081624B1 (de
Inventor
Guy Quesnel
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.)
Stein Industrie SA
Original Assignee
Stein Industrie SA
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Filing date
Publication date
Application filed by Stein Industrie SA filed Critical Stein Industrie SA
Publication of EP0081624A1 publication Critical patent/EP0081624A1/de
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Publication of EP0081624B1 publication Critical patent/EP0081624B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F23K1/04—Heating fuel prior to delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus

Definitions

  • the present invention relates to a process for the combustion of wet bituminous shales with low calorific value in a combustion chamber, in which the shales are ground in the presence of a hot drying gas, the relatively large ground grains are screened in order to separate and recycle them. the coarsest fraction, then introduced in suspension in primary air into the combustion chamber.
  • Oil shales of this kind have a calorific value and a composition of the order of:
  • the object of the present invention is to remedy these difficulties, and to provide a process which ensures the grinding of wet bituminous shales with relatively low energy consumption and wear of the mills, and easy separation and recovery of the finest grains from the grinding product, as well as satisfactory combustion in the combustion chamber.
  • the process according to the invention is characterized in that after grinding the hot gas and the ground grains are introduced into an expansion chamber from which the finest grains are entrained by the drying gas towards filtration means, then combined with the relatively larger grains downstream of their screening, and in that the drying gas consists of the mixture, in proportions dosed as a function of the humidity level of the shales, of hot gases sampled in the combustion chamber and cooled flue gases taken off the combustion chamber to the atmosphere.
  • the device for implementing the method of the invention comprising means for grinding the wet bituminous shales in the presence of a hot drying gas, means for screening the relatively larger crushed grains in order to separate the coarsest fraction thereof.
  • means for introducing the grains screened into a combustion chamber suspended in primary air is characterized in that it further comprises an expansion chamber downstream of the grinding means, means for driving the finest grains separated in the expansion chamber towards filtration means, means for joining the finest grains stopped by the filtration means with the relatively larger grains downstream of the screening of the latter, and means for mixing in proportions proportioned according to the humidity level of the shales to be burned, hot gases taken from the combustion chamber and cooled fumes taken from the discharge from the combustion chamber to the atmosphere, to form said hot drying gas.
  • the wet bituminous shales to be treated in blocks of average size 0 to 300 mm, have a higher calorific value of 1000 Cal / Kg, and water contents of approximately 15% by weight, in organic matter of approximately 20% by weight ( about 80% of which is volatile), and about 65% by weight of ash.
  • the latter is supplied with hot drying gas, consisting of a mixture of combustion gases taken off at around 900 ° C. in the firebox. the combustion chamber and recycled through line 4, and smoke at about 160 ° C taken from the bottom of the boiler chimney, arriving through line 5, in proportions adjusted so as to obtain a drying gas at 650 ° C. about.
  • the blocks to be treated are introduced with the drying gas into a highly shielded autogenous crusher 6, formed by a relatively flat cylinder carried by two bearings rotating at a speed of around 12 to 20 revolutions / minute and driven by the motor 7.
  • the blocks crush themselves by mutual shocks inside the mill, while drying.
  • the roughly ground product leaves the evacuation pin 7A and enters the expansion chamber 8. If the shales to be treated had a relatively high hardness, or if it was desired to obtain a product in fairly fine grains, it could be added to the grinder 6 of the balls. It would then have to be supplied in blocks of smaller dimensions (0 to 25 mm for example).
  • the finest particles, formed by grains of average size less than 100 microns, and constituting approximately. 15% of the treated product is entrained by the drying gas in the vertical pipe 9, which brings them to a set of bag filters 10. These particles are stopped by the filters, while the drying gas sucked in by the fan 11 is discharged to the atmosphere through the piping 12.
  • the separated particles are returned by conduits such as 13 to the feed hoppers of the burners of the combustion chamber, where they are joined to the larger sifted grains, as will be described more far.
  • the largest grains gathered in the bottom of the expansion chamber 8 are brought by the bucket elevator 14 to a main distributor 15, then to the secondary distributors 16A and 16B, from where they fall into screens such as 17A, 17B. These consist of vibrating sieves of 0.8 mm mesh.
  • the larger grains form a refusal which is returned by the inclined conduits 18A and 18B, then 19, to the feed box 3 of the mill, to be reprocessed there.
  • the screened grains of dimension less than 0.8 mm are brought by conveyors 20A, 20B, then a distributor belt 21, to a hopper 21A for supplying the combustion chamber.
  • the distribution belt is also supplied with fine particles separated in the bag filters, by conduits such as 13.
  • the grains are transported at a flow rate dosed by the conduits such as 22, then entrained by air in airfoils with a slight slope (10 ° to 15 °) such as 23, to the feed. burners. They are suspended, in a similar way to what is already done for other granular fuels, in primary air, but at a relatively high concentration, of the order of one kg of shale grains for 0.5 kg of air, in order to facilitate their ignition.
  • a supply station (not shown) similar to that which has been described above, also supplies a set of burners disposed on the other side of the combustion chamber, represented by the orifices such as 25B.
  • the flames follow U-shaped paths such as 27, 28 before rising in the upper part (arrow 29) towards the water circulation tubes to be heated and vaporized.
  • a fraction of the hot gases from the combustion chamber, at around 900 ° C., is withdrawn therefrom via line 4, and combined with fumes taken from the bottom of the exhaust chimney to the atmosphere, arriving via the conduit 5, as indicated above.
  • the bottom ash is collected at the bottom thereof on a grid, cooled and evacuated.
  • the soot entrained by the combustion gases is captured by natural or electrostatic filtration means and also evacuated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Processing Of Solid Wastes (AREA)
  • Disintegrating Or Milling (AREA)
EP82104767A 1981-12-11 1982-06-01 Verfahren und Vorrichtung zum Verbrennen von feuchten bituminösen Schiefern mit geringer Heizkraft Expired EP0081624B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8123182 1981-12-11
FR8123182A FR2518220A1 (fr) 1981-12-11 1981-12-11 Procede et dispositif de combustion de schistes bitumineux humides a faible pouvoir calorifique

Publications (2)

Publication Number Publication Date
EP0081624A1 true EP0081624A1 (de) 1983-06-22
EP0081624B1 EP0081624B1 (de) 1985-05-15

Family

ID=9264919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104767A Expired EP0081624B1 (de) 1981-12-11 1982-06-01 Verfahren und Vorrichtung zum Verbrennen von feuchten bituminösen Schiefern mit geringer Heizkraft

Country Status (7)

Country Link
US (1) US4429646A (de)
EP (1) EP0081624B1 (de)
DE (1) DE3263510D1 (de)
ES (1) ES8304651A1 (de)
FR (1) FR2518220A1 (de)
MA (1) MA19491A1 (de)
RO (1) RO85312A (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6225053B1 (en) * 1997-12-12 2001-05-01 Digene Corporation Detection of hepatitis B virus
US7384615B2 (en) * 2004-12-02 2008-06-10 Battelle Energy Alliance, Llc Method oil shale pollutant sorption/NOx reburning multi-pollutant control
US7708964B2 (en) * 2004-12-02 2010-05-04 Battelle Energy Alliance, Llc Oil shale derived pollutant control materials and methods and apparatuses for producing and utilizing the same
US20080282889A1 (en) * 2007-05-17 2008-11-20 Battelle Energy Alliance, Llc Oil shale based method and apparatus for emission reduction in gas streams
CN113684046B (zh) * 2021-09-28 2022-07-22 宁夏回族自治区矿产地质调查院 一种油页岩有机废弃物催化干馏设备及干馏工艺

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE49002C (de) * CH. AKERS in, London E. C. Mark Lane Zerkleinerungs - Schleudermaschine
CH181760A (de) * 1934-10-11 1936-01-15 Hephaest A G Fuer Motorische K Verfahren zum Betrieb einer mit einer pneumatischen Kohlenmühle versehenen Feuerungsanlage.
CH352085A (de) * 1957-04-18 1961-02-15 Sulzer Ag Verfahren und Anlage zur Herstellung von Kohlenstaub
DE1108844B (de) * 1955-03-19 1961-06-15 Maschf Augsburg Nuernberg Ag Doppelschmelzkammer fuer Kohlenstaubfeuerung
DE1174935B (de) * 1957-03-06 1964-07-30 Babcock & Wilcox Dampfkessel Verfahren zum Betriebe einer Schmelzkammer-feuerung mit mehreren Brennstoffen
DE2853031A1 (de) * 1978-12-08 1980-06-26 Kloeckner Humboldt Deutz Ag Zum betrieb mit inertgas ausgebildete analge, insbesondere mahltrocknungsanlage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE49002C (de) * CH. AKERS in, London E. C. Mark Lane Zerkleinerungs - Schleudermaschine
CH181760A (de) * 1934-10-11 1936-01-15 Hephaest A G Fuer Motorische K Verfahren zum Betrieb einer mit einer pneumatischen Kohlenmühle versehenen Feuerungsanlage.
DE1108844B (de) * 1955-03-19 1961-06-15 Maschf Augsburg Nuernberg Ag Doppelschmelzkammer fuer Kohlenstaubfeuerung
DE1174935B (de) * 1957-03-06 1964-07-30 Babcock & Wilcox Dampfkessel Verfahren zum Betriebe einer Schmelzkammer-feuerung mit mehreren Brennstoffen
CH352085A (de) * 1957-04-18 1961-02-15 Sulzer Ag Verfahren und Anlage zur Herstellung von Kohlenstaub
DE2853031A1 (de) * 1978-12-08 1980-06-26 Kloeckner Humboldt Deutz Ag Zum betrieb mit inertgas ausgebildete analge, insbesondere mahltrocknungsanlage

Also Published As

Publication number Publication date
FR2518220B1 (de) 1984-01-27
ES512716A0 (es) 1983-03-01
FR2518220A1 (fr) 1983-06-17
MA19491A1 (fr) 1982-12-31
RO85312A (ro) 1985-12-20
DE3263510D1 (en) 1985-06-20
US4429646A (en) 1984-02-07
EP0081624B1 (de) 1985-05-15
ES8304651A1 (es) 1983-03-01
RO85312B (ro) 1984-10-30

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