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WO1993015360A1 - Appareil d'incineration - Google Patents

Appareil d'incineration Download PDF

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Publication number
WO1993015360A1
WO1993015360A1 PCT/GB1993/000115 GB9300115W WO9315360A1 WO 1993015360 A1 WO1993015360 A1 WO 1993015360A1 GB 9300115 W GB9300115 W GB 9300115W WO 9315360 A1 WO9315360 A1 WO 9315360A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluidised bed
fuel gas
gas
housing
air
Prior art date
Application number
PCT/GB1993/000115
Other languages
English (en)
Inventor
Peter Hodson
Original Assignee
Richards Engineering Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Richards Engineering Limited filed Critical Richards Engineering Limited
Publication of WO1993015360A1 publication Critical patent/WO1993015360A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • 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
    • F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed

Definitions

  • This invention relates to apparatus for the incineration of granular or particulate material, in particular to apparatus for the thermal reclamation of a material such as foundry sand.
  • Used foundry sand may be subjected to reclamation so that it can be re-used in foundry processes.
  • Such reclamation can take the form of mechanical attrition, whereby the sand is broken down into grain-size particles.
  • used foundry sand contains a high proportion of chemical bonding agents, eg phenolic resins, and after a while these agents reach such a level that the properties of the sand deteriorate, even with mechanical reclamation. Consequently, there is a need for a thermal reclamation technique whereby the chemical agents are incinerated, leaving relatively clean sand.
  • Such thermal reclamation is typically conducted in a furnace having a fluidised bed.
  • material to be treated is fed in and incinerated, the waste gases escaping through a flue stack at the top of the furnace.
  • the reclaimed material is removed either periodically or continuously.
  • a problem which is encountered in furnaces of this type is that addition of material to be treated causes a localised drop in temperature which must be compensated by an increased supply of fuel gas. This may have the consequence, however, that other parts of the fluidised bed may be overheated.
  • incineration apparatus for incinerating a particulate material, the apparatus comprising a furnace housing, means for introducing material to be incinerated into the housing, means for forming a fluidised bed in the material in the lower part of the housing, a plurality of independently-operable fuel gas supply means for supplying fuel gas to different regions of the fluidised bed, and means for measuring the temperature of at least some of the regions.
  • the apparatus according to the invention is advantageous primarily in that it enables close control of the processing temperature in an incineration furnace.
  • the different regions of the fluidised bed may be maintained at the same temperature or temperature gradients or other profiles may be established.
  • the supply of fuel to one region may be altered without changing the temperatures of the other regions, which may lead to economies in fuel consumption.
  • the apparatus is of relatively simple, and hence inexpensive, construction.
  • the apparatus according to the invention may be used for the incineration of a wide range of particulate materials, but is of particular utility in the thermal reclamation of a base material from a mixture of that material with a combustible substance.
  • a base material is foundry sand.
  • Another material which may be incinerated using the apparatus according to the invention is dewatered sewage.
  • the fuel gas supply means preferably comprises suitable arrangements of pipes fitted with, for example, nozzles or bubble caps.
  • the means for measuring the temperatures of the various regions of the fluidised bed may, for example, be thermocouples.
  • Control means may be provided to automatically adjust the supply of fuel gas to each region in response to the measured temperatures.
  • the apparatus may be of the type described in our co-pending UK Patent Application No 9200341.7 or may be of more conventional design.
  • the material to be incinerated may be fed directly into the lower part of the fluidised bed as described in our co-pending UK patent application no 2244939A, in which case the .material may be fed into the fluidised bed from below the latter. Alternatively, the material may be fed onto the bed from above by conventional means.
  • the means for introducing the material into the housing may, for example, be a mechanical or pneumatic conveyor.
  • a plurality of feeds is preferably provided which operate in sequence. For example, where two such feeds are provided, these can operate alternately.
  • Figure 1 shows a sectional side view of a thermal reclamation apparatus according to the invention
  • Figure 2 is a detailed view of part of the apparatus of Figure 1.
  • a thermal reclamation apparatus (generally designated 1) according to the invention is of the type described in our co-pending UK Patent Application No 9200341.7 and comprises a generally bell-shaped furnace housing 2 of mild steel.
  • the furnace housing 2 is lined with a layer 3 of closely packed ceramic fibre which is secured to the housing 2 by hooks and skewers (not shown) in a conventional manner.
  • an access door 4 for maintenance and a stack 5 through which flue gases can escape.
  • Air/gas introduced through the manifold arrangements 6a-c fluidises the bed 8, except in the regions shown by cross- hatching. These latter regions act as an insulating layer between the fluidised bed 8 and the housing 2.
  • the fluidised bed 8 comprises three zones A,B,C corresponding to the three manifold arrangements 6a-c.
  • the temperature of each zone A,B,C may be independently monitored by means of thermocouples 15,16,17.
  • An exit chute 10 is located towards the right as shown in Figure 1 with its opening a short distance below the level of the bed 8.
  • the manifold arrangement 6c actually comprises two manifolds - a pre-heated air manifold 21 and a gas/air manifold 22.
  • the arms of both manifolds 21,22 terminate in bubble caps 2la,22a.
  • the other manifold arrangements 6a and 6b are of similar form.
  • mixing of the gas and air takes place in the bubble caps 22a. This has the important advantage that it prevents excessive heating of the gas before mixing with the air in the bubble caps 22a, and hence prevents cracking of the fuel gas.
  • material to be reclaimed such as a comminuted mixture of foundry sand and phenolic resin bonding agent
  • material to be reclaimed is fed from, for example, a silo or hopper (not shown), and introduced into zone A of the bed 8 via the conveyor tube 7.
  • the material thus enters the fluidised bed 8 from below, through the interstices between the bubble caps of the manifold arrangement 6a.
  • each zone A,B,C is monitored by means of the thermocouples 15,16,17.
  • the supply of gas/air mixture to the manifold arrangements 6a-c is controlled independently. For example, as fresh material is introduced to zone A the temperature in that zone may start to fall and the supply of gas/air mixture will be increased to compensate.
  • the temperatures in the three zones A,B,C may be maintained at substantially the same level, or at differing levels. For instance, a temperature gradient, either increasing or decreasing, may be established. Similarly, the temperature in each individual zone may be maintained at a substantially constant level or may be varied.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)

Abstract

Un appareil d'incinération (1) servant à incinérer un matériau particulaire comprend un corps (2) de fourneau, un élément (7) permettant d'introduire le matériau à incinérer dans le corps (2), ainsi qu'un moyen permettant de former un lit fluidisé dans le matériau dans la partie inférieure du corps (2). Une multiplicité d'éléments d'alimentation (6a-c) en gaz combustible, à actionnement indépendant, alimentent en gaz combustible différentes régions du lit fluidisé, et des éléments (15, 16, 17) sont prévus pour mesurer la température de certaines de ces régions au moins.
PCT/GB1993/000115 1992-01-31 1993-01-19 Appareil d'incineration WO1993015360A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9202049.4 1992-01-31
GB9202049A GB2264352A (en) 1992-01-31 1992-01-31 Incineration apparatus

Publications (1)

Publication Number Publication Date
WO1993015360A1 true WO1993015360A1 (fr) 1993-08-05

Family

ID=10709583

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000115 WO1993015360A1 (fr) 1992-01-31 1993-01-19 Appareil d'incineration

Country Status (3)

Country Link
AU (1) AU3817093A (fr)
GB (1) GB2264352A (fr)
WO (1) WO1993015360A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8846049B2 (en) 2005-06-27 2014-09-30 Glaxosmithkline Biologicals S.A. Process for manufacturing vaccines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5462214B2 (ja) * 2011-03-31 2014-04-02 株式会社神鋼環境ソリューション 流動層炉

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050518A2 (fr) * 1980-10-20 1982-04-28 The British Petroleum Company p.l.c. Dispositif de combustion à lit fluidisé
EP0056851A2 (fr) * 1981-01-27 1982-08-04 Ebara Corporation Réacteur thermique du type à lit fluidisé
WO1986003279A1 (fr) * 1984-11-30 1986-06-05 Foerster Guenther Reacteur a lit fluidise pour elimination thermique des ordures
EP0280016A2 (fr) * 1987-02-27 1988-08-31 L. & C. Steinmüller GmbH Dispositif d'injection d'un fluide gazeux pour un procédé à lit fluidisé

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1355054A (en) * 1970-09-22 1974-06-05 Gwb Boilers Ltd Industrial boilers
RO66095A2 (fr) * 1977-04-18 1983-02-01 Institutul National Pentru Creatie Stiintifica Si Tehnica,Ro Procede et installation pour l'incineration des dechets menajers
IT1155658B (it) * 1982-03-23 1987-01-28 Fata Ind Spa Sistema e metodo per il recupero delle sabbie contenute in forme ed anime di fonderia mediante calcinazione in un forno a letto fluidizzato
DD206421A1 (de) * 1982-10-01 1984-01-25 Mansfeld Kombinat W Pieck Veb Vorrichtung zur trocknung und entoelung von metallspaenen
GB9010611D0 (en) * 1990-05-11 1990-07-04 Richards Eng Ltd Thermal reclamation method and apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050518A2 (fr) * 1980-10-20 1982-04-28 The British Petroleum Company p.l.c. Dispositif de combustion à lit fluidisé
EP0056851A2 (fr) * 1981-01-27 1982-08-04 Ebara Corporation Réacteur thermique du type à lit fluidisé
WO1986003279A1 (fr) * 1984-11-30 1986-06-05 Foerster Guenther Reacteur a lit fluidise pour elimination thermique des ordures
EP0280016A2 (fr) * 1987-02-27 1988-08-31 L. & C. Steinmüller GmbH Dispositif d'injection d'un fluide gazeux pour un procédé à lit fluidisé

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 89 (M-132)(967) 27 May 1982 *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 29 (M-356)7 February 1985 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8846049B2 (en) 2005-06-27 2014-09-30 Glaxosmithkline Biologicals S.A. Process for manufacturing vaccines

Also Published As

Publication number Publication date
AU3817093A (en) 1993-09-01
GB2264352A (en) 1993-08-25
GB9202049D0 (en) 1992-03-18

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