FR2464434A1 - TUBE-ENVELOPE OF RADIANT HEATING - Google Patents

Abstract

RADIATION HEATING DEVICE INCLUDING AN ANNULAR COMBUSTION GAS EXHAUST INTERSTICE THAT SEPARATES BURNER 2 AND RADIANT TUBE 1, THIS RADIANT HEATING TUBE FITTING IN AN OPENING FOR EXAMPLE FROM THE WALL OF AN OVEN. THE RADIATION HEATING TUBE-ENCLOSURE INCLUDES A COATING 13 OF THERMAL AND SOUND INSULATION AT LEAST ON THE LEVEL OF THE OVEN WALL, AGAINST THE INSIDE SIDE 14, TURNS OUT, OF THE ANNULAR INTERSTICE 12. APPLICATION TO OVENS INDUSTRIAL.

Description

The invention relates to a tube-enveloDpe radiant heating

  of an industrial furnace, an annular gap for evacuation of the combustion gases being formed between the burner and this tube-envelope, the latter penetrating into the internal volume of the furnace by a

  opening in the wall of the latter.

  The heat energy is radiated in the

  chamber of industrial furnaces of this type by the tube-

  radiating envelope. the heating flame is

  in a hearth tube disposed coaxially in the tube-

  radiating envelope with interposition of an annular gap. Exhaust exhaust back through the gap

  annular and are evacuated by a tubing.

  Good insulation is needed to keep heat losses low. This remark relates in particular to the region in which the brightener penetrates inside the oven through a closed opening

in the wall of the latter.

  A radiation heating tube-jacket of known type comprises an insulation at the wall of the furnace, this insulation being disposed outside of this jacket-tube in the passage formed in the wall of the furnace. The insulation may thus be damaged by, for example, the forces imposed by the heating envelope tube which is not supported.

  about 2 meters long.

  The invention therefore relates to a mounting in which the insulation of the tubelefoam radiative heating is protected against mechanical damage at the crossing of the wall of the furnace, the insulation

  thermal assembly according to the invention being improved.

  According to an essential feature of the

  vention, the tube-radiative heating envelope

  at least at the level of the wall of the furnace

  thermal insulation and sound insulation on the coast - 2 - -2-

  interior, facing outwards, from the annular gap

lar.

  According to the particular embodiment,

  In accordance with the invention, annular insulating elements which are mounted in the annular gap which is widened at the level of the insulation are applied against the

  the inner side of this gap yes is turned towards the ex-

  TER AL. The advantages provided by the resident invention

  especially in the fact that the provision of the isola-

  inside the radiant heating tube

  protects the latter against damage from outside.

  Thermal insulation is improved by the fact that the gases

  evacuation along the insulation placed inside the

  In the furnace wall, therefore, these gases no longer come into direct thermal contact with the radiating tube at this level. This provision also makes it possible to reduce

  the amount of insulation material used and therefore of

  to make insulation material of better quality.

  Moreover, the vibration damping

  thus obtained also makes it possible to restrict

  mission of the noises produced by laziness to the outside.

  The invention will be described in more detail with reference to the accompanying drawings by way of non-limiting example and in which the single figure is a sectional view.

  longitudinal direction of a radially

is lying. -

  The jacket tube 1 of the radiant heater is made of heat-resistant steel and a gas jet 2 is co-equipped at one end of this tube which penetrates through its end projecting the flame into a furnace tube 3 also arranged coaxially in the radiating tube 1. The flame is in the furnace tube, while the exhaust gases exit at the end of this furnace tube to reflux an annular gap 4 formed between the radiating tube 1 and the furnace tube. 3 thus cue in an annular gap 5 formed between the

  burner 2 and the radiating tube 1, these gases being final-

  The radiant heating jacket-tube penetrates through an opening in the wall 7 of the oven for a length of about 2 meters inside this oven and is hermetically sealed.

  to the envelope 9 of the furnace by a flange connection 8. The

  10 inlet gas bulle and inlet pipe 11

  air are at the burner head end 2.

  The annular gap 5 formed between the burner

  their 2 and the radiating tube-envelope 1 is for example

  slightly widened at the crossing of this tube-

  envelope in the wall 7 of the oven and this interstice is

  mostly filled with an insulating coating 13

  pressed against the inner side 14, facing outwards, of the radiating tube, so that the reflux of the exhaust gas passes along the insulating coating 13

  in the rest of the annular gap 12 and therefore not

  be more in direct thermal contact with the tube radius-

  1. It is not absolutely essential to

  the annular gap 5 to set up the coating-

insulating 13.

  The insulation shown is formed of a coating

  13 made by deposit. However, it is also possible to produce this coating in the form of annular insulating elements that can be put in place in the corresponding gap. -4-

REVEEDICATIONS

  1. Radiant heating jacket-tube for an industrial furnace, an annular gap for evacuation of the combustion gases being formed between the burner and the radiating tube and the latter being mounted in a passage formed in the wall of the furnace, characterized in that the radiation-heating jacket-jacket comprises a heat and sound insulation coating (13) at least at the wall of the oven, on the inner side (14),

  turned outward, of the annular gap (12).

  2. Tube-radiative heating envelope

  according to claim 1, characterized in that the coating

  The thermal insulation and sound insulation consists of annular insulating elements placed in the corresponding gap so as to be applied against the side

  interior (14), facing outward, of this gap.