Method and apparatus for activating large particles
AssigneeAsea Stal AB
InventorsMats Olsson, Roland Sandstrom
Life of this patent
Estimating the term…
Abstract
The invention relates to method and apparatus for the combustion of large solid fuels. In order to improve the beneficial effect of sound on combustion are a bed of the fuel located on a grate, the bed of fuel is exposed to a high particle velocity of a sound positively produced by an external low frequency sound generator, the frequency of which is determined by the sound generator, to provide a reciprocating movement of combustion air and combustion gas through the fuel bed. The dimensions of the grate in a plane transverse to the reciprocating movement of combustion air and combustion gas are less than a quarter of the wave length of the sound generated by the sound generator.
Claims16
A method for the combustion of large particles of solid fuel in a fuel bed located on a grate having certain dimensions in a plane extending therethrough, said method comprising the steps of (1) feeding combustion air toward said fuel bed so as to enable the large particles of solid fuel therein to combust and produce combustion gas, (2) generating high particle velocity sound having a maximum frequency of 60 Hz and a wavelength which is greater than twice said certain dimensions of said grate, and (3) directing said generated sound into the vicinity of said grate to provide a reciprocating movement of said combustion air and combustion gas through said fuel bed thereon, the reciprocating movement occurring in a direction perpendicular to said plane extending through said grate.
An apparatus for the combustion of large particles of solid fuel contained in a fuel bed, said apparatus comprising a grate on which said fuel bed is positionable, said grate having certain dimensions in a plane extending therethrough;
- means for supplying combustion air to said fuel bed so as to enable said large particles of solid fuel thereon to combust and produce combustion gas;
- and a low frequency sound generator, said low frequency generator generating low frequency sound having a maximum frequency of 60 Hz and a wavelength of more than twice said certain dimensions of said grate, said low frequency sound providing a high velocity of reciprocating air which is directed towards the vicinity of said grate to thus create a reciprocating movement of combustion air and combustion gas through said fuel bed on said grate in a direction perpendicular to said plane extending through said grate.
Dependencies are inferred from the claim text.