WO1991017384A1 - Recycle conduit insulation assembly - Google Patents
Recycle conduit insulation assembly Download PDFInfo
- Publication number
- WO1991017384A1 WO1991017384A1 PCT/US1991/003057 US9103057W WO9117384A1 WO 1991017384 A1 WO1991017384 A1 WO 1991017384A1 US 9103057 W US9103057 W US 9103057W WO 9117384 A1 WO9117384 A1 WO 9117384A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conduit
- assembly
- chamber
- shell
- shell elements
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/20—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having rotating or oscillating drums
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/12—Arrangements for supporting insulation from the wall or body insulated, e.g. by means of spacers between pipe and heat-insulating material; Arrangements specially adapted for supporting insulated bodies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
- F16L59/21—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for expansion-compensation devices
Definitions
- the present invention relates to rotary reactors which use inorganic particulate material to convey heat energy to organic material to be burned and, more particularly, to assemblies for insulating the external recycle conduit of such a rotary reactor.
- a common device for incinerating hazardous materials and other toxic wastes is the rotary reactor.
- a rotary reactor includes a horizontally-oriented cylindrical drum or chamber which is rotated slowly about a horizontal axis concentric with the chamber by electric motors which engage ring gears mounted on the chamber. The ends of the chamber are open and are received within annular hoods. At an inlet hood, fuel is injected into the chamber and burned to provide the heat for combusting waste, and other nozzles and orifices are provided to inject the waste material to be burned.
- Lifters are mounted on the interior of the chamber and rotation of the chamber brings the lifters successively through a bed of inorganic particulate material, such as sand, located in the bottom of the chamber.
- a bed of inorganic particulate material such as sand
- the lifters, loaded with sand are rotated upwardly and above the sand bed, they gradually empty the sand downwardly back into the bed, thereby allowing the sand to be heated and intermingled with the waste materials to be burned. This action allows the sand to convey heat absorbed from the burning fuel to the waste material.
- rotary reactors include a recycle conduit or chute. Such an apparatus is shown in Reed et al.
- the recycle chute comprises a helical conduit coiling about the outer periphery of the cylindrical chamber.
- the helical conduit communicates with the chamber at its front and rear ends and coils oppositely to the direction of rotation of the chamber. Particulate material entering the recycle conduit at the "downstream” end of the chamber flows to the "upstream” end adjacent the fuel and waste inlets by the rotation of the chamber.
- Such recycle conduits typically are made of 253MA stainless steel which is appropriate for withstanding the high temperatures and corrosive environment within the chamber. However, this material rapidly radiates heat from the particulate material being conveyed to the upstream end of the chamber.
- the present invention is a recycle conduit insulation assembly for use with a rotary reactor which is capable of handling the high temperature levels (on the order of 870°C) as well as the stresses imposed by the expansion and contraction of the recycle conduit due
- SUBSTITUTESHEET to changes in temperature. Further, the present invention is not affected by the rotating movement of the conduit on which it is mounted.
- the invention is used with a rotary reactor having a rotating, horizontally-oriented cylindrical chamber for burning materials therein, a quantity of particulate, inorganic material within the chamber for conveying heat energy to material to be burned, and a helical substantially cylindrical conduit extending about said chamber and communicating with opposite ends thereof for conveying the particulate material from one end of the chamber to the other as the chamber rotates.
- the invention is characterized by shell means comprising a plurality of shell elements, spaced from and enclosing the conduit and forming an insulation space with the conduit; mounting means comprising a plurality of ring elements attached to the conduit and supporting the shell means; and insulating means occupying the insulation space.
- the shell elements are each welded at one end to a mounting ring and are unattached at an opposite end but overlap the next adjacent shell element. Consequently, the shell elements are capable of sliding longitudinally relative to each other to accommodate longitudinal dimensional changes of the conduit resulting from thermal stresses.
- the insulating space preferably is filled with a pumpable refractory having insulation capabilities.
- Each shell element includes couplings which permit liquid, pumpable refractory mixture to be injected into the insulation space.
- the mounting rings are segmented so that they can accommodate changes in a radial dimension resulting from thermal stresses.
- Fig. 1 is a somewhat schematic, side elevation of a rotary reactor having a recycle conduit fitted with the insulation assembly of a preferred embodiment of the invention
- Fig. 2 is a detail side elevation in section taken at line 2-2 of Fig. 1;
- Fig. 3 is a section taken at line 3-3 of Fig. 2;
- Fig. 4 is a detail perspective view of the insulation assembly of Fig. 1 showing a mounting ring.
- the recycle conduit insulation assembly generally designated 10
- the rotary reactor 14 includes a horizontally-oriented, cylindrical chamber 16 which is supported for rotation between stationary upstream and downstream hoods 18, 20, respectively.
- the recycle conduit 12 comprises segments of cylindrical pipe fabricated from 253MA stainless steel connected at mating flanges 22 and extending in a helical path about the chamber 16.
- the downstream end of the conduit 12 communicates with the interior of the chamber 16 at the downstream end at connection 24.
- the upstream end of the conduit 12 communicates with the interior of the chamber 16 at connection 26.
- SUBSTITUTESHEET chamber 16 rotates, particulate inorganic material within the chamber enters the conduit 12 through the connection 24 and progresses through the conduit to re-enter the chamber 16 at connection 26.
- the rotation of the reactor causes the particulate inorganic material to progress outwardly through the helical conduit 12.
- the insulation assembly 10 comprises a plurality of shell elements 28 supported by and spaced from the conduit 12 by ring members 30.
- Each shell element 28 consists of a substantially rectangular sheet of 16 gauge galvanized sheet metal bent to form a cylinder having mating flanges 32, 34 at its ends, joined by sheet metal screws 36.
- each mounting ring 30 comprises a pair of opposing ring segments 38, 40 attached to the conduit by a pair of weldments 42, 44.
- Each ring segment 38, 40 is substantially T-shaped in cross section (see Fig. 2) and is fabricated from 304 stainless steel.
- the T-shape includes a radially- extending web 46 and an axially-extending support flange 48.
- the webs 46 of the ring segments 38, 40 each include a radially-extending notch 50 midway between the ends 52, 54.
- the ends 52, 54 are bevelled to form triangular slots when they meet.
- the weldments 42, 44 are positioned midway between the notches 50 and the ends 52, 54.
- each shell element 28 extends between and is supported by two mounting rings 30, thereby defining an insulation space 58 between the shell element 28, conduit 12 and contiguous mounting rings 30.
- Each shell element 28 is attached to the
- the shell elements 28 are sized such that the free, unwelded ends overlap the welded end of the next adjacent shell element 28. Accordingly, the sequence of shell elements 28 is capable of expanding or contracting longitudinally in response to longitudinal dimensional changes of the conduit 12 on which they are mounted.
- Each shell element 28 includes a pair of half couplings 62, 64, positioned adjacent ends thereof which enable a pumpable refractory mixture to be injected into the insulation spaces 58.
- the pumpable refractory mixture 66 preferably has insulation capabilities, and an appropriate type is Fiber Frax GS, produced by Carborundum Corporation.
- the insulation assembly 10 is mounted on a conduit 12 in the following manner.
- the ring segments 38, 40 of the mounting rings 30 are first welded to the conduit at intervals corresponding to the lengths of the shell elements 28 which are to be used. It should be noted that the spacing of mounting rings 30 need not be uniform; spacing decreases with a decrease in the radius of curvature of the conduit. Accordingly, spacing of mounting rings around elbows and tight curves is shorter than for long gradual curving segments.
- Each mounting ring 30 is attached by four weldments spaced as shown in Fig. 3.
- the shell elements are then mounted on the support flanges 48 of the mounting rings 30 and are welded at their ends in overlapping relation as shown in Fig. 2.
- the refractory mixture 66 is pumped through either coupling 62 or 64 for each shell element 28 until the mixture emerges from the other coupling, thereby indicating that the insulation space 58 is substantially
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69103605T DE69103605T2 (en) | 1990-04-30 | 1991-04-30 | TURNING REACTOR. |
EP91909651A EP0480020B1 (en) | 1990-04-30 | 1991-04-30 | Rotary reactor |
KR1019910701977A KR920702767A (en) | 1990-04-30 | 1991-04-30 | Recirculation Conduit Insulation Assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/516,484 US5091157A (en) | 1990-04-30 | 1990-04-30 | Recycle conduit insulation assembly |
US516,484 | 1990-04-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991017384A1 true WO1991017384A1 (en) | 1991-11-14 |
Family
ID=24055799
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1991/003057 WO1991017384A1 (en) | 1990-04-30 | 1991-04-30 | Recycle conduit insulation assembly |
Country Status (8)
Country | Link |
---|---|
US (1) | US5091157A (en) |
EP (1) | EP0480020B1 (en) |
KR (1) | KR920702767A (en) |
AT (1) | ATE110457T1 (en) |
CA (1) | CA2062818A1 (en) |
DE (1) | DE69103605T2 (en) |
HU (1) | HUT60377A (en) |
WO (1) | WO1991017384A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104455917A (en) * | 2014-11-27 | 2015-03-25 | 南京理工大学 | Inflaming retarding and explosion suppressing device for combustible explosive compressed gas and fluid pipeline |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3559660A (en) * | 1968-08-28 | 1971-02-02 | Warren Petroleum Corp | Pipe insulation and method of making same |
NL8100417A (en) * | 1981-01-28 | 1982-03-01 | Wavin Bv | Concentric plastic tubes with plastic foam-filled annular space - are held apart by T=section plastic spacers |
US4563246A (en) * | 1983-05-17 | 1986-01-07 | Pedco, Inc. | Apparatus for retorting particulate solids having recoverable volatile constituents |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1959772A (en) * | 1931-09-23 | 1934-05-22 | Asea Ab | Rotary furnace for treating pulverized ore with gas |
US1980828A (en) * | 1932-01-15 | 1934-11-13 | Harry S Reed | Apparatus and process for distilling and treating coal and other carbonaceous materials |
US3607121A (en) * | 1969-12-19 | 1971-09-21 | Allied Chem | Rotary furnace having recycle provision |
US4301750A (en) * | 1978-03-15 | 1981-11-24 | Pan American Resources, Inc. | Method for pyrolyzing waste materials |
IT1102144B (en) * | 1978-03-30 | 1985-10-07 | Elettrocarbonium Spa | IMPROVEMENT IN CONTINUOUS RING OVENS |
US4293324A (en) * | 1980-02-21 | 1981-10-06 | Olin Corporation | Process for the production of layered glass batch pellets |
US4338868A (en) * | 1981-02-03 | 1982-07-13 | Lientz La Clede | Refuse burning process and apparatus |
US4724777A (en) * | 1983-07-28 | 1988-02-16 | Pedco, Inc. | Apparatus for combustion of diverse materials and heat utilization |
US4676740A (en) * | 1986-03-24 | 1987-06-30 | Debeus Anthony J | Heat exchange apparatus and process for rotary kilns |
US4938171A (en) * | 1989-12-12 | 1990-07-03 | The Babcock & Wilcox Company | Transport conduit for hot particulate material |
-
1990
- 1990-04-30 US US07/516,484 patent/US5091157A/en not_active Expired - Fee Related
-
1991
- 1991-04-30 CA CA002062818A patent/CA2062818A1/en not_active Abandoned
- 1991-04-30 HU HU914032A patent/HUT60377A/en unknown
- 1991-04-30 KR KR1019910701977A patent/KR920702767A/en not_active Application Discontinuation
- 1991-04-30 EP EP91909651A patent/EP0480020B1/en not_active Expired - Lifetime
- 1991-04-30 DE DE69103605T patent/DE69103605T2/en not_active Expired - Fee Related
- 1991-04-30 AT AT91909651T patent/ATE110457T1/en not_active IP Right Cessation
- 1991-04-30 WO PCT/US1991/003057 patent/WO1991017384A1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3559660A (en) * | 1968-08-28 | 1971-02-02 | Warren Petroleum Corp | Pipe insulation and method of making same |
NL8100417A (en) * | 1981-01-28 | 1982-03-01 | Wavin Bv | Concentric plastic tubes with plastic foam-filled annular space - are held apart by T=section plastic spacers |
US4563246A (en) * | 1983-05-17 | 1986-01-07 | Pedco, Inc. | Apparatus for retorting particulate solids having recoverable volatile constituents |
Also Published As
Publication number | Publication date |
---|---|
DE69103605T2 (en) | 1995-03-16 |
CA2062818A1 (en) | 1991-10-31 |
EP0480020A1 (en) | 1992-04-15 |
HUT60377A (en) | 1992-08-28 |
DE69103605D1 (en) | 1994-09-29 |
ATE110457T1 (en) | 1994-09-15 |
HU914032D0 (en) | 1992-06-29 |
KR920702767A (en) | 1992-10-06 |
US5091157A (en) | 1992-02-25 |
EP0480020B1 (en) | 1994-08-24 |
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