Fuel and related compositions – Liquid fuels – Aluminum or heavy metal – other than lead – containing
Patent
1982-09-29
1985-05-28
Dees, Carl F.
Fuel and related compositions
Liquid fuels
Aluminum or heavy metal, other than lead, containing
44 13, 100 38, 100155R, C10L 544, A01F 1504, B30B 1116
Patent
active
045198080
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of producing straw briquettes of a stable shape from whole, unchopped straws in a briquette pressing means.
The art comprises straw briquette presses for compressing straw to solid fuel in the form of briquettes. These straw presses are not transportable, but stationarily operating machines using known techniques with flywheels, cranks and plungers. The stationary operation has not made straw balers superfluous as the straw is transported to the briquette press in the form of bales. Further, a separate binder is generally added to provide a briquette having a stable shape.
The Danish Patent Specification 18 394 discloses a straw packer having two pistons where the straw when compressed is folded and stacked in layers in front of the pistons.
The U.S. Pat. No. 3,348,475 discloses a press for making briquettes from hay which is present in the form of whole straws and is subjected to simple compression while being fed forwardly in a cylinder.
The U.S. Pat. No. 3,780,646 discloses a fibre compression apparatus in which the fibre material is squeezed into the pressing conduit of a roller press by a feed means having two cooperating rotary oscillating pistons and is subjected to progressive compaction by the rollers of the press.
Straw briquettes having a density of approximately 0.7 g/cm.sup.3 can be made by means of the known devices. They are not resistant to moisture because of an incoherent surface.
The U.S. Pat. No. 3,323,444 discloses a press for making briquettes from hay in which the hay while being compressed is heated to cause it to plasticize and to permit additional compression and formation of a shape-stabilizing skin on the briquettes. The vapours developed during the heating process have no possibility of escaping during the compression, which accordingly cannot be complete here either.
The object of the invention is to provide a method of producing straw briquettes having a stable shape and a density of approximately 1 g/cm.sup.3 with a minimum energy consumption and without using any binders.
This is achieved according to the invention by a method in which the straws in the briquette pressing means are subjected to a compaction of a relatively high frequency at a high pressure by a set of means whose working motions are symmetrical, to form a sausage of straw, and that the formed sausage of straw is allowed to give off vapours during subsequent heating.
The invention also comprises an apparatus for carrying out the method, and this apparatus is characterized in that the briquette pressing means is shaped as two rotatable blocks which are provided with fingers and to which synchronized, oppositely directed rotary oscillations are imparted by means of a high-speed mechanism having a dead center in the most advanced end position of the fingers in engagement with the straws; and in that the subsequent heating means comprises a briquette feed pipe which is externally heated by means of hot air and has a set of radially extending evaporation apertures in the pipe wall. In the pressing means the straws are subjected to pressure impacts totalling 30 to 50 metric tons about 8 times per second, resulting in a compression in the longitudinal direction of approximately 0.5 cm per impact, i.e. approximately 4 cm/s=144 m/h. This gives with a cross sectional area of 8.5.times.5.0=42 cm.sup.2 a production capacity of 0.42.times.1440 dm.sup.3 =600 l/h.about.600 kg/h. Thus, with a total power consumption of 50 kW the output of the apparatus of the invention is about 12 kg/kWh. By comparison, the known stationary briquetting machines can produce about 1000 kg/h with a power consumption of about 150 kW, which corresponds to an output of about 7 kg/kWh.
The briquette feed pipe is cylindrical in shape, and the evaporation apertures are formed as longitudinal rows of holes in the pipe wall, or the pipe is made of polygonally disposed bars clamped against each other and having longitudinal slots serving as evaporation apertures.
Being fitted with a feed device, the straw briquette pre
REFERENCES:
patent: 3323444 (1967-06-01), Mark et al.
patent: 3348475 (1967-10-01), Fenster et al.
patent: 3780646 (1973-12-01), Ancellin
patent: 3946660 (1976-03-01), Kuhtreiber
LandOfFree
Straw fuel briquette press does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Straw fuel briquette press, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Straw fuel briquette press will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-866765