Furnaces – Process – Incinerating refuse
Reexamination Certificate
2000-06-01
2001-08-14
Ferensic, Denise L. (Department: 3749)
Furnaces
Process
Incinerating refuse
C110S234000, C110S185000, C110S186000, C110S191000, C110S235000, C110S246000, C110S255000, C110S263000, C110S267000, C110S327000, C110S347000, C110S1010CD, C110S103000, C110S1010CD, C110S1010CF, C432S117000
Reexamination Certificate
active
06273009
ABSTRACT:
TECHNICAL FIELD
The invention relates to a method for automatized combustion of solid fuel in a combustion apparatus which comprises a burner with a device, which is rotatable about the centre axis of the burner for stirring the fuel in the burner which is connected to a boiler and has a feeding-in opening for fuel in the rear end of the burner outside of the boiler and an outlet opening for completely or partly combusted flue gases in the front end of the burner which opens in a combustion chamber inside the boiler which comprises a convection unit, from which a hot water conduit extends, said combustion apparatus also including a fan provided to be driven by a second motor, here called fan motor, for blowing combustion air into the burner, and a fuel charge feeder for fuel provided to be driven by a third motor, here called fuel charge feeding motor. The invention also relates to the said combustion apparatus.
BACKGROUND OF THE INVENTION
Solid fuels have a number of significant advantages before fuel oil; they are generally cheaper, they are available in large amounts, and they take part in a natural circulation and do not cause pollution load on the environment in spite of their emission of carbon dioxide, when they are based on wood or other renewable bio-products. Nevertheless, solid fuels are used to a comparatively small degree in the modern society. The main reason for this condition probably is that it is easy to automatize combustion of fuel oil but comparatively difficult to automatize combustion of solid fuel, and it is particularly difficult to automatize solid fuel combustion in order to provide an efficient combustion at all heating effect levels without emission of products with the fuel gases which are harmful to the environment.
BRIEF DISCLOSURE OF THE INVENTION
It is the purpose of the invention to solve the said problems. More particularly, the invention aims at providing a method and a combustion apparatus of the kind mentioned in the preamble, wherein the apparatus shall satisfy the following objectives:
The combustion device shall be able to operate essentially automatically, i.e. with only small manual operations. These operations normally shall be limited to the very ignition- and starting up operation, which according to official directions for solid fuel combustion plants has to be performed under manual supervision. Also the feeding out of ash shall preferably be able to be made automatically.
The starting up shall be easy to perform.
The combustion apparatus shall have a high efficiency, i.e. allow a high degree of utilization of the energy content of the fuel for transformation to heat energy which can be utilized in the convection unit of the boiler.
The combustion apparatus shall provide desired boiler water temperature with desired, preferably adjustable accuracy.
The combustion apparatus shall be able to be used for different effect needs and shall have a wide range of control with reference to generated effect.
The combustion apparatus shall be highly fireproof and have a high safety against breakdowns and other disturbances or accidents.
The combustion apparatus shall be able to be applied to a great number of different boilers.
The apparatus shall be easy to trim, which i.a. implies that the method of operation of the apparatus shall be such that it readily, through the setting of various parameters in a control program, can be adapted to those conditions which apply in every single case, such as the effect need, the character of the fuel, etc.
The flue gases which are emitted from the combustion apparatus shall at all effect levels only contain products which will lie well below permitted emission values.
The combustion apparatus shall be easy to trim in the complete intended effect range of the combustion apparatus, which also contributes to the low emission values.
The combustion apparatus shall have a high reliability of operation and have a long working life, it shall have comparatively small dimensions and be able to be made of non-complicated and non-expensive components.
These objectives and advantages of the invention can be achieved therein that the invention is characterized by what is stated in the appending patent claims. Further characteristics and aspects of the inventions will be apparent from the following description of a preferred embodiment.
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Ferensic Denise L.
Kirkpatrick & Stockton LLP
Marcou George T.
Rinehart K. B.
Swedish Bioburner System Aktiebolag
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