AU612007B2

AU612007B2 - Reactor furnace

Info

Publication number: AU612007B2
Application number: AU31153/89A
Authority: AU
Inventors: Owen Edward Jones
Original assignee: BLACKWALL REACH NOMINEES Pty L
Current assignee: BLACKWALL REACH NOMINEES Pty Ltd
Priority date: 1988-03-10
Filing date: 1989-03-09
Publication date: 1991-06-27
Anticipated expiration: 2009-03-09
Also published as: AU3115389A

Description

I 612007 COMMONWEALTH OF AUSTRALIA Patents Act 1952 COMPLETE SPECIFICATION (Original) FOR OFFICE USE Application Number: PI7183 Class Lodged: 10/03/88 Complete Specification Lodged: Accepted: Published: Priority: Class Int.

Related Art: 0 6 TO BE COMPLETED BY APPLICANT Name of Applicant: BLACKWALL REACH NOMINEES PTY LTD, a Company incorporated according to the State of Western Australia, Commonwealth of Australia.

Address of Applicant: 10 Blackwall Reach Parade, Bicton, in the State of Western Australia, Commonwealth of Australia.

1" Actual Inventor: Owen Edward Jones Address for Service:- Wray Associates Primary Industry House 239 Adelaide Terrace Perth Western Australia 6000.

Complete Specification for the invention entitled: "REACTOR FURNACE" The following statement is a full description of this invention, including the best method of performing it known to us:- 1 2 THIS INVENTION relates to reactor furnaces and in particular reactor furnaces for the effecting of the oxidation of particulate materials.

In one form the invention resides in a reactor furnace comprising a primary burner a reaction chamber and a secondary burner, said primary and secondary burners each having an axial passageway which each open at one end into the reaction chamber, said primary and secondary burners being located to each side of the reaction chamber such that the central axes of the primary and secondary burner are substantially coaxial, the walls of the passageways of the primary and secondary burners having a plurality of outlets at spaced locations therein which are .o*0 directed substantially tangential to the central axis said outlets being connected to a source of air and/or fuel and/or an air fuel mixture, a delivery means for injecting particulate reactant material axially into the passageway of the primary burner at or in the region of the other end of the primary burner, whereby in operation a vortex o° entraining the particulate material is produced in the S passageways of the primary and secondary burners and in o the reaction chamber whereby said particulate material is carried from the other end of the passageway of the S primary burner to the other end of the passageway of the C secondary burner.

The invention will be more fully understood in the light of the following description of one specific embodiment.

i The description is made with reference to the accompanying drawing which is a schematic side elevation of a reactor furnace according to the embodiment.

The reactor furnace shown in the embodiment can be used for the oxidation of noxious solid particulate or fluidised waste products to render them substantially environmentally inert.

i' I-L3Y pa~a~-~ 2a The function of the reactor furnace of the embodiment is to provide for a means of reacting waste products which must be conducted at relatively high temperatures under conditions where the reactant particles and resultant product particles are prevented from making contact with any surface which may result in a build up of material and of scavenging of refractory surfaces by chemical action 00 e 0 0 so o 0 o 0 o o 0 0 0 0 00000 0 Q o o 0 e4 D 0 a> r9 3 both of which would be detrimental to the operation of the furnace.

One particular application of the invention relates to the treatment of the waste products of the processing of bauxite into alumina such as sodium oxalate and red mud.

The embodiment utilises a burner which operates in the same general principle as that which is the subject of Australian patent number 557099. The embodiment comprises a reaction chamber 11 which comprises a substantially to 1!O axial passageway 12. If desired the walls of the axial passageway 12 may diverge from one end to the other or as shown in the drawing may be parallel to each other or may converge. The one end of the axial passageway 12 has mounted thereto a primary burner 13 which comprises a substantially cylindrical annular refractory member 14 I ~having an outlet 15 opening into the one end of the 000, reaction chamber 11. The other end of the refractory member 14 comprises the inlet and is connected to a source *O .0 of air having waste material entrained therein through an inlet duct 16. The inlet duct 16 is associated with a venturi delivery means 17 whereby the particulate waste o material is introduced into the air stream mixture to be o entrained therewith and carried to the primary combustion chamber 13. The walls of the refractory 14 have embedded therein a tubular coil 18 which has an inlet 19 connected to a supply of an air fuel mixture. The fuel injected into the primary burner with the air may comprise gaseous fuel, vaporised or atomised liquid fuel or alternatively a solid particulate fuel. The coil is provided with a plurality of outlet ports which extend from the coil through the walls of the refractory member 14 to inject the air fuel mixture substantially tangentially into the primary combustion chamber 13. If desired a pair of coils 18 may be embedded in the walls of the primary chamber rylaiiruu-nu~ ~UI1~ u~ 4whereby the second coil may be used to inject additional air into the combustion chamber or if desired the coils can separately inject air and fuel into the combustion chamber. The injection of the air fuel mixture tangentially into the primary chamber serves to circulate the resultant gases and any solids entrained therein around the combustion chamber to create a vortex to increase the transit time of any solid particles therein.

The tangential injection from the wall of the chamber i0 throughout its length of the air fuel mixture also serves Sto prevent contact between the walls of the refractory 14 and any of the mixture within the primary chamber burning fuel or waste material or products of combustion or oxidation of the waste material.

o If desired an additional primary burner 20 may be provided to one side of the axial passageway 12 to effect an 0:o injection of a combustion mixture of air and fuel 0" laterally into the axial passageway. This additional o primary chamber 20 may if desired also provide an oo

S°

0 z additional or alternative inlet for the waste materials to be reacted.

SThe other end of the axial passageway 12 of the combustion chamber 11 is connected to a secondary burner 21 comprising a cylindrical annular refractory member 22 having a tubular coil 23 embedded therein. The inlet 24 of the tubular coil is connected to a supply of an air fuel mixture. In addition the tubular coil is provided with a plurality of axially spaced ports which are directed tangentially into the axial passageway defined by the refractory 22 in the same general direction as the direction of injection of the primary burner. As a result, the air fuel mixture is injected into the material exiting from the axial passageway 12 to provide for the addition of more heat to that mixture to complete the treatment of any unreacted waste material.

-o If desired the venturi mixers provided for t..e waste material may comprise screw feeders or any other appropriate form of feeder rather than the venturi feeder described above. In addition the inlet 16 of the primary combustion chamber 13 and the corresponding inlet for the other primary combustion chamber 20 may be associated with an axially directed gas jet or liquid fuel atomiser having an outlet located at the inlet of the respective refractory element for the injection of additional fuel axially into the primary combustion chambers. The outlet of the secondary burner 21 is connected to a cyclonic separator for the collection of the treated waste product.

While the embodiment as described in relation to a pair of primary burners whereby material can be injected into the combustion chamber 11 axially and radially it should be appreciated that either one of the combustion chambers may be eliminated without detracting from the effectiveness of *the present invention.

o0 £f In relation to the primary and/or secondary burner it may be appropriate to provide for some additional injection radially into the circulating combustion mixture in the burners in order that the temperature of the mixture at the centre of the secondary burner is maintained or raised to the appropriate temperature.

t It should be appreciated that the scope of the present invention need not be limited to the particular scope of the embodiment described above.

1

Claims

1. A reactor furnace comprising a primary burner a reaction chamber and a secondary burner, said primary and secondary burners each having an axial passageway which each open at one end into the reaction chamber, said pr.mary and secondary burners being located to each side of the reaction chamber such that the central axes of the primary and secondary burner are substantially coaxial, the walls of the passageways of the primary and secondary burners having a plurality of outlets at spaced locations therein which are directed substantially tangential to the central axis said outlets being connected to a source of air and/or fuel and/or an air fuel mixture, a delivery means for injecting particulate reactant material axially into the passageway of the primary burner at or in the region of the other end of the primary burner, whereby in operation a vortex entraining the particulate material is produced in the passageways of the primary and secondary burners and in the reaction chamber whereby said particulate material is carried from the other end of the passageway of the primary burner to the other end of the passageway of the secondary burner.

2. A reactor furnace as claimed at claim 1 wherein the particulate reactor material is entrained in a airstream which is injected axially into the primary burner. 0 0 0 0000 o 0 I 4 4 t t I

3. A reactor furnace as claimed at claim 1 or 2 wherein a second primary burner having an axial passageway is mounted to open at one end into the reaction chamber the central axis of the second primary burner being transverse to the central axis of the first primary burner a plurality of outlets provided at spaced locations in the walls of the passageway said outlets being directed substantially tangential to the central axis of the passageway of the second primary burner. r

7- 4. A reactor furnace as claimed at claim 3 wherein the particulate reactant material is injected axially into the second primary burner from the other end thereof. A reactor furnace as claimed at claim 4 wherein the particulate reactant material is entrained in an air stream which is injected centrally into the second primary burner. o S 6. A reactor furnace as clAimed at any one of the o preceding claims wherein the air and fuel is injected into the primary and secondary burners from separate ports. 0 0 7. A reactor furnace as claimed at any one of claims 1 0 to 5 wherein the air and fuel is mixed prior to injection o 0 into the primary and secondary burners.

8. A reactor furnace as claimed a any one of the preceding claims wherein the walls of the primary and 0400 S secondary burners are formed of a heat resistant material Sand are associated with at least one tubular coil from 0 S which the air and fuel is injected through the outlets extending through the walls said outlets being spaced Salong the length of the coil.

9. A reactor furnace as claimed at any one of the preceding claims wherein the particulate reactant material comprises noxious waste material which can be oxidised at raised temperatures to a substantially non-noxious material. A -T I -8 A reactor furnace substantially as herein described. DATED this TWENTY EIGHTH day of FEBRUARY 1991. a 6 0 BLACKWALL REACH NOMINEES PTY LTD Applicant. Wray Associates Perth, Western Australia, Patent Attorneys for the Applicant. 000000 0 0 0000 00 00 0 4 *0 0 00 0 00 0 0 00 0 a 0 p4 41 4 IVT O0