WO1993006920A1 - Elements de chauffage radiants ameliores et structure - Google Patents

Elements de chauffage radiants ameliores et structure Download PDF

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Publication number
WO1993006920A1
WO1993006920A1 PCT/CA1992/000446 CA9200446W WO9306920A1 WO 1993006920 A1 WO1993006920 A1 WO 1993006920A1 CA 9200446 W CA9200446 W CA 9200446W WO 9306920 A1 WO9306920 A1 WO 9306920A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
lamp
lamps
washers
high intensity
Prior art date
Application number
PCT/CA1992/000446
Other languages
English (en)
Inventor
James E. Heath
Scott L. Angell
Original Assignee
Samuel Manu-Tech Inc.
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 Samuel Manu-Tech Inc. filed Critical Samuel Manu-Tech Inc.
Publication of WO1993006920A1 publication Critical patent/WO1993006920A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1836—Heating and cooling the reactor

Definitions

  • the present invention relates to heat treating structures and methods which utilize high intensity radiation for heating of the same.
  • the present invention relates to an improved fluidized bed and an arrangement for satisfactorily sealing a tube type member mounted across the bed.
  • the invention also relates to an infrared high intensity radiation lamp having particular application for fluidized beds and other high temperature heating structures where the lamp extends across the bed and is exposed either side of the bed.
  • the infrared high intensity radiation lamp comprises an infrared radiation emitting element contained within a quartz tube of a length substantially longer than the radiation emitting element. End seals are found at either end of the quartz tube, having associated therewith electrical connectors for connection to an external power supply and a non-radiation emitting electrical wire joining within the quartz tube the electrical connectors at said end seal and the infrared radiation emitting element whereby the spacing between each end seal and the radiation emitting element is at least five inches.
  • Such an arrangement in a high temperature structure accommodates the thickness of insulation in the nonradiation-emitting portion.
  • a seal for sealing between a tube passing through a wall of a heating zone comprises a series of at least two ceramic washers which are compressible and have a central port forming a seal with the tube.
  • a washer housing engages the washers and compresses the same by exerting a compressive force on the washers, which force is opposed by the resistance of the wall of the heating zone through which the tube extends.
  • the washer housing has a central port through which the tube extends in a non-binding manner. In this way, the ceramic washers are pressed against the wall of the heat zone adjacent the tube and against the quartz tube thereby providing an effective seal.
  • the present invention is also related to improvements in a fluid bed having opposed flat walls through which heating elements extend for heating of the bed.
  • the flat walls each have a common large port through which the lamps extend with the lamps being supported either side of the retort by a plate mount which closes one of the large ports.
  • the lamps extend through the plate mounts and are releasably mounted thereto in a manner to accommodate relative movement of the lamps and mounting plates that can occur during heating of the fluid bed. In this way, distortion of the retort is not directly transmitted to the lamps whereby the possibility of damaging the lamps is reduced.
  • Figure 1 is a cross section of the fluid bed
  • Figure 2 is a cross section of the unit at 90° to the cross section of Figure 1;
  • Figure 3 is a partial perspective view showing cooling of the lamp end seals;
  • Figure 4 is a vertical section showing infrared radiation lamps supported either side of the fluid bed;
  • Figure 5 is a cross sectional view showing the sealing of a quartz tube extending across a heating zone and having an infrared radiation lamp centrally disposed therein;
  • Figure 6 is a sectional view showing the sealing of a quartz lamp passing through a heat zone
  • Figure 7 is a partial perspective view showing details of the sealing arrangement
  • Figure 8 is an end view of the sealing arrangement for an infrared radiation emitting lamp
  • Figure 9 is a cross sectional view of the sealing arrangement for an infrared radiation lamp.
  • the fluid bed 2 shown in Figure 1 has a stainless steel retort 4 with fluidized particles 6 maintained within the retort 4.
  • Stainless steel is the preferred material, but any other material that can operate satisfactorily at the operating temperatures can be used.
  • a buried heating source 8 r in this case a series of high intensity infrared radiation lamps 10, extend across the retort with the ends of the lamps exterior to the retort.
  • Below the buried heating source 8 are fluidizing tubes 12 and sparge tubes 14.
  • the purpose of the sparge tubes is to introduce a fluidizing gas below the fluidizing tubes which serves to break up any jetting effect that may occur at the fluidizing tubes. Approximately 90% of the fluidizing gas is introduced through the fluidizing tubes 12 with only 10% through the sparge tubes.
  • the sparge tubes introduce limited turbulence which reduces jetting at the fluidizing tubes.
  • a power supply 16 is connected to the power distribution arrangement 18 which in turn is connected to the electrical connectors of the infrared radiation lamps at the ends thereof.
  • the portion of the lamp at the junction with the electrical connector is referred to as the end seal.
  • the end seals have a restricted temperature operating range and typically are maintained below about 600°F.
  • a thermocouple 20 is positioned above the buried heating source and monitors the average temperature of the fluid bed.
  • the stainless steel retort is closed on the upper surface by insulated members 26 which are hinged at the side of the structure to allow wide access to the stainless steel retort 4. Insulation is also provided about the retort to minimize heat loss from the structure. The thermal efficiency of the bed is directly effected by heat loss and therefore insulation is provided where practical.
  • the stationary insulation material is generally shown as 28 in Figure 2.
  • a slump zone 22 which is connected to a drain chute 24. These slump zones can be used for removing particles from the fluid bed retained within the stainless steel retort.
  • a blower 40 is shown to one side of the retort and is used to cool the ends of the high intensity infrared radiation lamps on that side of the bed with a similar arrangement on the opposite side of the bed.
  • the power supply 16 distributes power to the banks of infrared radiation lamps and is monitored and adjusted to maintain the desired temperature of the fluidized bed. This adjusting of the power levels would be carried out by a separate controller which is not shown and would have the thermocouple connected thereto as an input to provide the necessary temperature monitoring feature.
  • FIG. 3 illustrates how the infrared radiation lamps 10 are mounted across the stainless steel retort.
  • a channel type area is provided from one end of the retort to the other whereby air can pass over the end seals of the lamps, particularly at the point of connection of the power connectors to the lamps.
  • one limiting feature is the temperature to which the end seal can be exposed. This is normally much lower than the capability of the infrared radiation lamp and, therefore, some applications have been limited by the operating limit of the end seals.
  • a cooling air flow is passed across the ends of the lamps to maintain them within the specified operating range.
  • All of the lamps are mounted to a common mounting plate 30 which has thereon fastening pins 32, each having a retaining end 33.
  • a washer housing 34 cooperates with these fastening pins 32 and retaining ends 33 to mount the lamps 10 across the stainless steel retort.
  • the washer housing 34 includes an oversized hole 35 through which the lamp 10 extends and an oversized hole 36 is provided in the mounting plate 30 for accommodating the positioning of the lamp across the fluid bed. These oversized holes serve to isolate the infrared radiation lamp from the stainless steel retort which can, during heating thereof, undergo considerable distortion which can, if not accommodated, cause breakage of the infrared radiation lamps.
  • the washer housing 34 has camming surfaces 38 either side of a locking slot 39.
  • the camming surfaces 38 allow compression of washers interior to the washer housing, and locking slot 39 maintains the washer housing in a locked position once so rotated relative to the fastening pins 32. Details of this relation can be seen in Figure 7 wherein a series of ceramic washers 62 are shown in exploded relationship relative to the washer housing 34. The relative position of the washers in a compressed state when the washer housing 34 is in a locked position is shown in the cross section of Figure 9. It can be seen that the central ports of the washers 62 each provide a wiper and/or compression seal with the infrared radiation lamp 10 and the housing 34 compresses the series of washers 62 due to being retained by the fastening pins 32.
  • the wiper and/or compression seal of the washers and the fact that these washers are in a compressed state between the housing 34 and the mounting plate 30 ensures that an effective seal is provided about the oversized hole 36 in the mounting plate 30 and about each lamp.
  • the infrared radiation lamp 10 is primarily supported by the ceramic washers 62 and can accommodate limited relative movement of the infrared radiation lamp relative to the mounting plate and retort due to the oversized holes 36 in the mounting plate and the oversized holes 35 in the washer housing 34.
  • this sealing arrangement about a lamp is also applicable to sealing of any tube type member which projects through the wall of a retort or furnace structure.
  • Figure 5 wherein the infrared radiation lamp 10 is placed interior to a quartz tube 60 with the quartz tube 60 being sealed relative to the fluid bed.
  • the quartz tube 60 is open at either end and serves to protect the infrared radiation lamp from the fluid bed. It would also be possible to use this type of sealing arrangement in an oven type structure where it is desired to isolate the infrared radiation lamp 10 from the environment and/or atmosphere of the heating structure.
  • the seal can be made between the tube and the mounting plate which is secured to the oven.
  • the use of a separate mounting plate further isolates the lamps or tubes from the retort wall or oven wall, however, the seal could also be between the actual retort wall and a lamp or tube, if desired.
  • a low volume airflow 70 passes through the quartz tube between the quartz tube and the infrared radiation lamp 10.
  • This low volume airflow preferably is not sufficient for cooling of the lamp end seal, generally shown as 56.
  • a high volume airflow, generally shown as 72 is directed across the ends of the lamps to provide satisfactory cooling of the lamp end seals. It can be seen that the relationship of the quartz tube 60 to the length of the infrared radiation lamp 10 is such that the end seal of the lamp 10 projects, preferably about two inches beyond the end of the quartz tube 60.
  • the radiation emitting elements 52 are all located interior to the wall of the heating structure, generally shown as 74, whereby the sealing arrangement is spaced from the radiation emitting elements 52, as it is desired to expose the fluidized particles of the bed or the interior of the oven to this radiation, but it is not desirable to have such a high powered heat source directly radiating to the sealing arrangement or to the thickness of the port through the walls of the mounting plate, retort wall or furnace wall. Therefore, to avoid this problem, electrical connector 54 serves to ensure that the radiation emitting elements are within the heating structure, with the sealing arrangement being exterior to the heating structure.
  • This high intensity infrared radiation lamp having a long end portion at either end thereof which does not emit radiation allows effective sealing along this extended portion while also accommodating the need to satisfactorily cool the end seals 56 of the infrared radiation emitting lamps 10.
  • the infrared radiation lamps 10 of Figure 5 have a lamp extension portion 58, which is beneficial to allow effective sealing of the lamp or related tube structure to a heating zone while also allowing effective cooling of the end seals 56.
  • an entry port 5 is provided at either end of the retort whereby continuous material such as stripper wire can be passed through the fluidized bed and heat treated as it is passed therethrough.
  • Suitable rollers or retaining structures can be provided for maintaining the strap within the fluidized particles.
  • the material to be treated is of a particle type nature, such as the reclaiming of foundry sand, and it is desirable to introduce the foundry sand at a controlled level through a top port provided in members 26 or any other suitable port near the upper part of the fluidized bed. With the controlled introduction of particles into the fluid bed, some material will flow into the slump zones 22 and out the discharge chutes 24.
  • the heat zone is a zone which is defined by the infrared radiation lamps 10 which are staggered, one above the other, two high and extend generally the length of the fluid bed. This provides an intense region. where the particles are exposed to very high temperatures.
  • the average temperature of the bed may be in the range of approximately 1500°F; it is believed that particles near the heat zone 8 may experience momentary temperatures substantially higher than the average temperature of the bed, possibly up to approximately 3000°F, which temperature is approaching the temperature of the radiation emitting elements of the lamps.
  • This possible occurrence of a very hot zone about the bank of infrared radiation lamps may explain the extremely-favourable test results for treated foundry sand where treated sand in some cases was considered better than new foundry sand due to the extent to which binders and residue were removed and due to the shape of the treated sand which was better for forming castings.
  • the present heating structures can be used for conventional heat treating of materials on a batch or continuous basis as well as other nonconventional applications such as foundry sand recovery or treating of other hazardous or nonhazardous material at elevated temperatures.
  • the bed and method can achieve efficient combustion at high temperatures and many materials can be effectively treated in this manner. Other materials can benefit merely by being heated to these temperatures.
  • binding materials used to form castings can be burned off extremely rapidly and that the foundry sand previously used in a casting process can be effectively reclaimed at very low cost.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Resistance Heating (AREA)

Abstract

On décrit un agencement particulier destiné à fermer hermétiquement un tube ou une lampe (10) traversant la paroi (74) d'un lit fluidisé (2) ou une paroi d'un four. Ce dispositif comprend une série de rondelles compressibles (62) en céramique qui sont comprimées contre le tube ou la lampe (10) et également contre la surface située autour d'un orifice (36) à travers lequel s'étend la lampe (10) ou le tube. Une lampe particulière (10) à rayonnement également décrite comporte des parties terminales allongées (58) n'émettant pas de rayonnement qui s'adaptent plus aisément à l'obturation de l'une et l'autre extrémités de la lampe (10) et à la séparation des joints terminaux (56) de la partie radiante de la lampe (10).
PCT/CA1992/000446 1991-10-11 1992-10-09 Elements de chauffage radiants ameliores et structure WO1993006920A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,053,394 1991-10-11
CA 2053394 CA2053394A1 (fr) 1991-10-11 1991-10-11 Elements chauffants emettant des radiations et structure

Publications (1)

Publication Number Publication Date
WO1993006920A1 true WO1993006920A1 (fr) 1993-04-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1992/000446 WO1993006920A1 (fr) 1991-10-11 1992-10-09 Elements de chauffage radiants ameliores et structure

Country Status (3)

Country Link
AU (1) AU2699392A (fr)
CA (1) CA2053394A1 (fr)
WO (1) WO1993006920A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017058087A (ja) * 2015-09-17 2017-03-23 本田技研工業株式会社 乾燥装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990016137A1 (fr) * 1989-06-16 1990-12-27 Electricity Association Services Limited Source de radiations infrarouges
WO1991019148A1 (fr) * 1990-06-08 1991-12-12 Bgk Finishing Systems, Inc. Lit fluidise avec lampes infrarouges immergees

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990016137A1 (fr) * 1989-06-16 1990-12-27 Electricity Association Services Limited Source de radiations infrarouges
WO1991019148A1 (fr) * 1990-06-08 1991-12-12 Bgk Finishing Systems, Inc. Lit fluidise avec lampes infrarouges immergees

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MODERN CASTING vol. 81, no. 10, October 1991, DES PLAINES US pages 37 - 39 J.M.SVOBODA & M.T.GRANLUND 'evaluating an infrared reclaimer for clay-bonded sands' *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017058087A (ja) * 2015-09-17 2017-03-23 本田技研工業株式会社 乾燥装置

Also Published As

Publication number Publication date
CA2053394A1 (fr) 1993-04-12
AU2699392A (en) 1993-05-03

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