Furnaces – With exhaust gas treatment means – Afterburning means
Patent
1991-06-13
1992-10-20
Favors, Edward G.
Furnaces
With exhaust gas treatment means
Afterburning means
110204, 110205, 431 5, F23B 500
Patent
active
051560976
DESCRIPTION:
BRIEF SUMMARY
This invention relates to combustion apparatus, for example a furnace or incinerator, for burning waste material, particularly but not exclusively for the incineration of rubber tires and like waste material.
The disposal of scrap tires has long been a problem. Tipping and subsequent burial may cause underground fires. Incineration, with the prospect of energy recovery, is an attractive proposition but has proved difficult to achieve at acceptable pollution levels.
It is well known to provide combustion apparatus with a primary combustion chamber into which the combustible material is charged and secondary and possibly further combustion chambers to which exhaust gases from the preceding combustion chamber are directed for further combustion in supplementary air supplied to these zones or chambers. For example U.S. Pat. No. 4,674,417 to Hoskinson proposes an improved stack construction for an incinerator capable of overcoming the "candlestick" effect in which air introduced into the stack for secondary combustion purposes merely flows along the inner wall of the stack without adequately mixing with the waste gases flowing along the central core. In order to overcome this problem air is introduced into the stack through an elongated vertical tube mounted centrally of the stack and having formed along its length a plurality of ports that face outwardly at an angle so that air introduced into the tube will be directed downwardly and radially outward towards the inner wall of the stack. Depending upon the relative dimensions of the central tube and the stack there may nevertheless continue to be problems with waste gases flowing upwardly over the inner wall of the stack, i.e. the turbulence generated by the central tube may not penetrate to the inner wall of the stack.
The present invention is intended to obviate or mitigate the aforesaid disadvantage by providing an improved design of incinerator capable of essentially complete combustion of waste material.
According to the present invention there is provided combustion apparatus comprising a combustion chamber for effecting primary combustion of combustible material charged thereinto, an exhaust conduit for exhaust gases emitted by the primary combustion, primary air inlet means for directing primary air into said combustion chamber, and secondary air inlet means for directing secondary air into the exhaust conduit at least in a region adjacent the combustion chamber so as to promote further combustion of said exhaust gases, said secondary air inlet means including air distributor means arranged in the conduit, characterised in that secondary air inlets are additionally provided in the wall of the conduit over at least part of the extent of the air distributor means.
The invention will now be further described by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 is a diagrammatic part-sectional view of an existing furnace fitted with secondary air inlet means and exhaust gas recycling means;
FIG. 2 is a cross-section on line II--II of FIG. 1;
FIG. 3 is a section on line III--III of FIG. 2;
FIG. 4 is a diagrammatic vertical section of a second embodiment of combustion apparatus in accordance with the invention, with insets showing portions thereof to an enlarged scale, and
FIG. 5 is a section of the stack to an enlarged scale showing the arrangement of the air distributing pipes.
Referring now to FIGS. 1 to 3 of the drawings, an existing furnace before modification comprises a combustion chamber 101 and an exhaust conduit in the form of a stack 102. In order to reduce or eliminate noxious exhaust omissions, the furnace is fitted with secondary air inlet means 103 and exhaust gas recycling means 104. The secondary air inlet means 103 comprises a hollow cylindrical sleeve 105 made in two parts 106, 107 (FIG. 2) for ease of assembly and dimensioned to fit closely in the lower part of the stack 102. The sleeve 105 has inner and outer walls 108, 109 defining therebetween an annular plenum chamber connected by a pipe 110 to a source
REFERENCES:
patent: 3670667 (1972-06-01), Faurholdt
patent: 4635568 (1987-01-01), Angelo, II
patent: 4674417 (1987-06-01), Hoskinson
patent: 4883003 (1989-11-01), Hoskinson
Booth Gerry
Donnelly Stewart
Lindley Brian
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