EP0081624B1 - 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 PDFInfo
- Publication number
- EP0081624B1 EP0081624B1 EP82104767A EP82104767A EP0081624B1 EP 0081624 B1 EP0081624 B1 EP 0081624B1 EP 82104767 A EP82104767 A EP 82104767A EP 82104767 A EP82104767 A EP 82104767A EP 0081624 B1 EP0081624 B1 EP 0081624B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grains
- combustion chamber
- combustion
- slates
- crushing
- 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.)
- Expired
Links
Images
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 grinders, and easy separation and recovery of the most of 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 relatively larger grains downstream of the screening of the latter, and means for mixing proportions proportioned as a function of the humidity level of the shales to be burned, of hot gases sampled in the combustion chamber and of cooled fumes sampled at the evacuation of the combustion chamber towards the mosphere, 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 (of which approximately 80% of volatile matter), and in ash of approximately 65% by weight.
- the latter is supplied with hot drying gas, consisting of a mixture of combustion gases taken off at around 900 ° C. in the 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 about 12 to 20 revolutions / minute and driven by the motor 7.
- the roughly ground product leaves through 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 be necessary to feed it 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, are 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 into the atmosphere by the piping 12.
- the separated particles are returned by conduits such as 13 to the feed hoppers to the combustion chamber burners, where they are joined to the larger screened grains, as will be described later.
- 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 supply of the burners. They are suspended, analogously 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, 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)
Claims (11)
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 EP0081624A1 (de) | 1983-06-22 |
EP0081624B1 true 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) | ES512716A0 (de) |
FR (1) | FR2518220A1 (de) |
MA (1) | MA19491A1 (de) |
RO (1) | RO85312A (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6225053B1 (en) * | 1997-12-12 | 2001-05-01 | Digene Corporation | Detection of hepatitis B virus |
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 |
US7384615B2 (en) * | 2004-12-02 | 2008-06-10 | Battelle Energy Alliance, Llc | Method oil shale pollutant sorption/NOx reburning multi-pollutant control |
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 |
Family Cites Families (6)
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 |
-
1981
- 1981-12-11 FR FR8123182A patent/FR2518220A1/fr active Granted
-
1982
- 1982-05-31 ES ES512716A patent/ES512716A0/es active Granted
- 1982-05-31 MA MA19698A patent/MA19491A1/fr unknown
- 1982-06-01 DE DE8282104767T patent/DE3263510D1/de not_active Expired
- 1982-06-01 EP EP82104767A patent/EP0081624B1/de not_active Expired
- 1982-06-07 RO RO82107814A patent/RO85312A/ro unknown
- 1982-06-17 US US06/389,350 patent/US4429646A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
RO85312B (ro) | 1984-10-30 |
EP0081624A1 (de) | 1983-06-22 |
US4429646A (en) | 1984-02-07 |
FR2518220B1 (de) | 1984-01-27 |
FR2518220A1 (fr) | 1983-06-17 |
DE3263510D1 (en) | 1985-06-20 |
RO85312A (ro) | 1985-12-20 |
ES8304651A1 (es) | 1983-03-01 |
ES512716A0 (es) | 1983-03-01 |
MA19491A1 (fr) | 1982-12-31 |
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