Furnaces – With fuel treatment means – Means for liberating gas from solid fuel
Patent
1982-05-20
1984-12-04
Favors, Edward G.
Furnaces
With fuel treatment means
Means for liberating gas from solid fuel
110210, 110226, 110233, 110246, 110342, 110346, 431 5, F23G 100
Patent
active
044857454
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the thermal portion of solid waste exploitation by burning and pyrolisis of the garbage as well as the suitable portion of the solid waste processing installation for implementing the method.
It is known with such methods to arrange and to operate completely separately the devices found in one and the same solid waste burning installation, namely the burning installation and the pyrolysis installation. The oil or natural gas-fired auxiliary burners of the combustion unit that can be switched over as an aggregate to control-unit control, serve as the start-up for the combustion unit and operate during the sustained operation of the installation only as long as is necessary to maintain as constant a combustion temperature relative to the instantaneous burning capacity of the waste as possible. On the other hand the pyrolysis unit is heated with the pure pyrolysis gas left after removing the recombustable macro-molecular components.
Furthermore, a method is known for thermal solid waste exploitation through pyrolysis and combustion in which the pyrolysis gases are taken untreated into a combustion reactor lined with pyrolysis coke, where it is cracked and burned as a mixture with the reactor gas as in a gas motor. The pyrolysis drum is heated with the exhaust gases from the gas motor. The apparatus is a modification of the wood generator for example, in order to use waste as a fuel and to convert the low temperature carbonization gases into a composition more suitable for powering motors.
The object of the invention is to make solid waste utilization more energy efficient, particularly so that no or very little oil or natural gas is needed for the back-up burners. This object is realized in the fact that the additional heating that assists the combustion of the waste at least partially comes from the burning of the gases generated in pyrolysis, and the heat needed for pyrolysis is provided by the flue gas from the combustion. The invention is based on the realization that the flue gas temperatures of a solid waste combustion chamber are high enough for the pyrolysis procedure, and the burning of pure pyrolysis gas for an auxiliary burner produces adequate temperatures.
The drawing illustrates, as an example, the thermal portion of a solid waste processing installation in a schematic view.
The solid waste processing installation according to the drawing consists of a pyrolysis unit 1 with a pyrolysis reactor 1a constructed as a rotatable drum, for example, and a unit 1b which is made up of condensor and gas scrubber units, whereby so-called "pure" pyrolysis gas leaves this apparatus. The pure gas outlet 3 is connected to an auxiliary burner 4 of a combustion unit 5. Between the flue gas outlet 6 of the combustion unit 5 and the auxiliary pre-heater 7 are the pyrolysis reactor 1a and a waste heat retrieval unit 10. In the auxiliary pre-heater 7 the combustion air 8 is heated by the flue gases that are drawn off through the smoke stack 9.
The solid arrows refer to the gaseous media; the dotted arrows represent the flow of liquids or solids in the pyrolysis unit 1 on the one hand and in the combustion unit 5 on the other.
The flue gases leaving the flame chamber of the combustion unit 5 at approximately 1200.degree. C. are conveyed through the duct 6 to the pyrolysis reactor 1a, with the drum configuration discussed above, first to an interior radiating heat surface and then to the outer drum casing. The temperature at which the pyrolysis material is processed is in the magnitude of 500.degree.-700.degree. C. The flue gases leaving the pyrolysis reactor are cooled to smoke stack temperature in the waste heat recovery unit 10 and the back-up pre-warmer 7.
The illustrated system schematic is the simplest in construction and is relevant in the ideal situation where there is a balanced energy budget in which the amount of pure pyrolysis gas generated equals exactly the supplementary heating requirements of the combustion unit 5. Depending on the type of waste available at any giv
REFERENCES:
patent: 3853498 (1974-12-01), Bailie
patent: 4179263 (1979-12-01), Jung et al.
patent: 4359006 (1982-11-01), Have
patent: 4361100 (1982-11-01), Hinger
Bracker Gerd-Peter
Riemann Hanns-Helmut
Favors Edward G.
Mannesmann Veba Umwelttechnik GmbH
Warner Steven E.
LandOfFree
Method for thermal processing of solid waste and the apparatus f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for thermal processing of solid waste and the apparatus f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for thermal processing of solid waste and the apparatus f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1577283