FR2624951A1 - DEVICE FOR COOLING A BURNER - Google Patents

Abstract

On a burner comprising an elongated combustion chamber 4 provided at its upper face with nozzles, there are provided between these nozzles cooling tubes 7 arranged perpendicular to the axis of the burner and inclined along vertical planes. It is particularly advantageous if it is a combustion chamber 4 of a water heater, bathed in the water to be heated, the two ends of the cooling tubes 7 piercing the wall 3 of the chamber 4 and the water from the water heater circulating in said tubes to cool the combustion zone 6 of the burner. The circulation of water in the cooling tubes 7 is ensured by thermodynamic means, the inclination of the tubes alternating in the direction of one tube to another to obtain a circulation against the current in neighboring tubes 7.

Description

41 2624951

  The present invention relates to a device for cooling a burner by means of at least one water-circulating tube extending over the combustion zone.

burner.

  The purpose of the invention is to ensure the efficient cooling of such a burner with a view to reducing the emission

  harmful gases (NOx) with the help of such simple equipment.

as much as possible.

  According to the invention, provision is made for this purpose

  a multitude of cooling tubes arranged

  to the longitudinal axis of the burner, for example

  with a ramp, between the beaks with which its superficial

  périeure. These tubes could be arranged horizontally

  curvatures, but to ensure the circulation of

  thermosyphon of water, they are preferably

  clinched along vertical planes. To improve the ef-

  cooling, it is advisable to arrange the

  besides, so that their inclination alternates from one to the other

be.

  The invention is advantageously used on burners

  their water heater whose combustion chamber is embedded in the water to be heated, for example in a storage water heater. In such a combustion chamber, the

  cooling tubes can pierce the wall of ladi-

  the chamber, the water surrounding it can thus circulate in these tubes. In this way, the cooling of the area

  the burner can be advantageously combined with

born with the heating of the water.

  To avoid any deterioration of the assembly of the cooling tubes with the wall of the chamber of

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  combustion as a result of deformation of these tubes under the

  As a result of the heat, the tubes may be provided at their ends with swellings capable of compensating for such deformations.

  An exemplary embodiment of the invention makes it

  throw drawing figures, which show

  Fig. 1, a longitudinal section of the burner of a heater

  water and its combustion chamber, Fig. 2, a cross section along II-II of FIG. 1, and

  Fig. 3, a detail III of FIG. 2, on an enlarged scale

die.

  The burner, a ramp 1 with spouts at its

  this upper, supplied with a mixture of air-fuel by a pipe 2, is inside a combustion chamber 4 surrounded by a wall 3, in the tank of a water heater filled with water . The flue gases come out

  of chamber 4 through a drain pipe 5. After

  mage, flames 6 are born at different beaks between

  which are the cooling tubes 7.

  The tubes 7 are placed between the flames 6 under a

  angle "of 10 to 30 from the horizontal and

  cent with their ends the wall 3. As it follows

  of fig. 3, they are welded to said wall.

  To compensate for deformations under the effect of

  heat, including deformations in length, the

  bes 7 comprise at least at one of their ends a swelling 8 capable of compensating for such deformations

or welding constraints.

  The flow of water in the tubes 7 communicating with the tank of the water heater is obtained by the thermodynamic effect resulting from their inclined position, the water heated by the flames 6 tending to move towards the upper end tube, which has the effect

  to cool the area o burn the flames 6.

  Thanks to the inclined alternating arrangement of a tube 7 to another, it is advantageously established a circulation

  countercurrent water in two tubes 7 neighbors.

4-624951

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Claims (4)

R e v e n d i c t i o n s   Device for cooling a burner by means of at least one water-circulating tube extending over the combustion zone of the burner, characterized in that a plurality of cooling tubes (7) is arranged perpendicularly the longitudinal axis of the burner (1), between the nozzles which is provided with its upper face, the   tubes being inclined in vertical planes.   2. Device according to claim 1, characterized   in that the cooling tubes (7) are   arranged so that their inclination alternates from one to the other.   3. Device according to claim 1 or 2 with   at least one burner disposed in a combustion chamber   a water heater, bathed in water to heat,   characterized by the fact that both ends of the tubes   cooling (7). circulating water penetrate the   king (3) of the combustion chamber (4), the water which   the tower can thus circulate in these tubes for cooling   dir the combustion zone (6) of the burner (1).   4. Device according to claim 3, characterized   in that the tubes (7) are provided with   of the wall (3) of the combustion chamber, that they   cent, of inflations (9) serving to compensate for contraindications   longitudinal effects resulting from the thermal effects of combustion.