FR2655134A1 - HEATING BOILER BODY WITH FLUID HEAT PUMP. - Google Patents

Abstract

The invention relates to a heat-transfer fluid heating-boiler body, arranged horizontally and encased at least partially by a jacket (3) for circulation of said fluid, which jacket is provided with an outlet (9) for the heated fluid and an inlet (8) for the cooled return fluid, while one of the ends of the body is arranged so as to receive at least one burner (4) and the other end is provided with an exhaust (5) for the combustion gases. The boiler body according to the invention is characterised in that the fluid return inlet has the form of a perforated distribution tube (8) which is arranged in the top part of the fluid jacket (3) and which penetrates the latter via the side opposite the burner (4), extending towards the side of the latter, while the outlet (9) for the heated fluid is provided in the bottom part of the fluid jacket (3). Advantageously, the internal wall (1) of the jacket (3) of closed periphery arranged at a short distance from said wall (1), while between the latter and said envelope there is a volume for a fluid, so as to form a thin sheet of fluid projecting into the jacket (3).

Description

The invention relates to a boiler body for fluid heating

  coolant, arranged horizontally and wrapped at least

  partially by a circulation sleeve of said fluid, generally

water.

  In a heating boiler equipped with a burner, the combustion gases are more or less saturated with water vapor depending on the excess of air in the flame and also on the content of

  hydrogen fuels used.

  This vapor causes the well-known phenomenon of condensation, also known as the phenomenon of dew, as soon as the saturated gases encounter a wall whose temperature is less than one.

  certain temperature (about 550 C).

  To avoid this undesirable phenomenon of particular condensation,

  corrosive, simply hold the wall of the heat exchanger

  by the water jacket, that which is in contact with the combustion gases.

  at a sufficiently high temperature (eg 600 C) by acting on the boiler burner In this case however, the water temperature of the boiler is generally much higher than the temperature required for the radiator circuit of the boiler. Heating This results in heat losses and the requirement to provide a mixing system (mixing or thermostatic valve) at the outlet of the unit to lower the flow temperature to the

  radiators by mixing with some of the return water.

  It has also been imagined other means, particularly in

  the wall of the exchanger, turned towards the combustion gases, by arranging, for example, fins to increase the exchange surface on the side of said combustion gases to ensure a

rapid rise in temperature.

  A boiler thus equipped makes it possible to envisage the removal of the mixing valve, so that the control system of

  the boiler can act directly and only on the burner.

  However, it usually does not allow you to delete all

  areas where the temperature would be lower than the temperature

  cant condensation It is therefore necessary to imagine other

anti-condensation means.

  This is why the invention proposes a boiler body of the above-mentioned type, the fluid circulation jacket being provided with a flow for the heated fluid and an inlet for the cooled return fluid, while one of the ends of the body is arranged to receive at least one burner and the other end is provided with a discharge of the combustion gases, and which is remarkable in that the arrival of the return fluid is in the form of a tube of

  perforated distribution which is arranged in the upper part of the

  fluid and plunges into it from the opposite side of the burner

  towards the side of the latter, while the departure of the hot fluid

  is provided in the lower part of the fluid jacket and preferably

  the opposite side of the burner.

  In this way, the return water which is the coldest, is thus brought back into the hottest part (which is due to

  natural convection, in the upper part of the shirt).

  In addition, the way this return is made is original

  (specific tube) for a boiler of the horizontal type.

  Advantageously, the dispensing tube is rectilinear and arranged over substantially the entire length of the fluid jacket, while it is closed at least partially at its end and

  has a plurality of orifices distributed along its length.

  In addition and preferably, the orifices of the distribution tube are formed in the upper half of the latter, that is to say in the half facing the outer wall of the jacket of

fluid, for example in pairs.

  In this way, not only is a jet towards the inner wall avoided.

  of the shirt to avoid cooling the latter punctually, but at the same time the outer wall is cooled, which

  can only reduce thermal losses.

  According to one embodiment, the orifices of the dispensing tube

  are more close to the burner side to be in greater numbers Indeed, it is towards the burner that the heat load

is obviously the most important.

  To allow the evacuation of any sludge or other impurities contained in the return fluid, an orifice is provided for the end of the dispensing tube, and it is arranged so as to open into the lower half thereof, c 'ie in

  half facing the inner wall of the fluid jacket.

  Advantageously in this case, a deflector is provided between the impurity discharge orifice and the inner wall of the

fluid shirt.

  In order to increase the temperature of the exchange wall, in the zones where the thermal loads are the lowest, the invention further proposes that the inner wall of the fluid jacket be provided on the opposite side to the burner. a closed peripheral envelope arranged at a short distance from said wall, while between said wall and said envelope is provided a volume for a fluid,

  to form a thin sheet of fluid projecting into the jacket.

  Indeed, the temperature of the combustion gases varies significantly between the heat source of the burner side and the side

  exhaust gas, so that it is advantageous to warm up

iron the wall of this last side.

  Given the small amount of liquid contained in the sheet, it will rise very rapidly in temperature from the start of the burner and will ensure an exchange of thermal energy with the liquid of the jacket located outside, by conduction through the casing and not by convection, the liquids of the jacket and the web not mixing or little (see below) According to one embodiment, between the inner wall of the fluid jacket and the casing peripheral, longitudinal partitions are provided to reduce and / or suppress any convection movement of the fluid.

  which is between said wall and said envelope.

  Although the sheet thus formed could be sealed, it can also be interesting to fill it at the time of filling of the boiler itself, in which case said casing has at least one filling orifice and at least one degassing orifice. there are also longitudinal partitions, which present then

  apertures for filling the volume forming the web.

  In all cases, the inner wall of the fluid jacket may be provided with a heat-filled heat exchange surface on its face turned towards the inside of the body, that is to say towards

the combustion gases.

  The invention will be well understood on reading the description

  which follows and which refers to the accompanying drawings in which: Figure 1 is a longitudinal section of a boiler equipped with a body according to the invention, os Figures 2 and 3 are partial sections along the lines respectively II- II and III-III of FIG. 1, FIG. 4 is a cutaway perspective view of the boiler body according to FIG.

  FIG. 5 is a radial section along V-V of FIG. 4.

  The drawings show a boiler body 1 in the form of a cylinder of revolution arranged horizontally The cylinder forming the body 1 is surrounded by a second cylinder 2 coaxial with the first so as to form between them a closed volume which constitutes a jacket 3 in which circulates water (or other heat transfer fluid).

  The body 1 constitutes a combustion chamber and is intended

  born to receive at one of its ends, here the left end with respect to Figure 1, a burner 4 while at its other end,

  an evacuation of the combustion gases is provided.

  The body 1 forms the inner wall of the water jacket 3 and the cylinder 2 the outer wall while the inner face of the body 1 is provided with a filled fins exchange surface 6 as the

fit figures 2 to 5.

  This finned surface 6 makes it possible to ensure a rapid rise in temperature, the heat then being transmitted by conduction to

  the water circulating in the shirt 3.

  The body 1 is further provided with a pot 7 (FIG. 1) for better

  channel and roll the combustion gases between the fins.

  The water to be heated, that is to say the return water of the heaters (radiators or other), arrives in the water jacket 3 in

  the upper part of it as shown in the drawings, that is,

  to say in the zone which is by natural convection hottest,

  while the departure of the heated water is foreseen in the lower part

  pool. In addition, the arrival of the return water is carried out by means of a tube 8 which plunges into the jacket 3, on the opposite side to the burner 4, while the start is via a pipe 9 also connected

  the opposite side to the burner (Figures 1 and 4).

  The inlet tube 8 extends from the opposite side to the burner towards the latter over the entire length of the jacket 3, its free end

  being closed as shown in Figure 1.

  The tube 8 also has dispensing perforations 10

  of water, over substantially its entire length, the latter being closer to

  side of the burner so as to be in greater numbers on the

  hottest side (Figures 1 and 4).

  The perforations 10 are formed in pairs, as shown in Figures 2 to 5, in the upper half of the tube 8 (Figures 1 to) so as to form jets to the outer wall 2 of the

  shirt 3 for the reasons already mentioned above.

  Towards the end of the tube 8, there is further provided an orifice 11, in the lower half thereof for the evacuation of any impurities contained in the return water, while under said orifice 11, that is, on the side of the body 1, there is a baffle 12. On the side of the evacuation 5 of the gases, the body 1 constituting the

  inner wall of the liner 3 is provided with a peripheral envelope

  13 (Figures 1 and 3 to 5) closed, which is arranged at a small distance from said wall so as to form a volume for a fluid, such as water, thereby constituting a thin sheet projecting into the

  shirt 3 as shown in Figures 1 and 4.

  In the volume thus created between the envelope 13 of the body 1, are arranged according to one embodiment, longitudinal partitions.

  such as 14a and 14b (Figures 4 and 5), to reduce and / or eliminate

  any convective movement of water contained in the said volume.

  According to one embodiment the envelope 13 is completely closed to form a sealed circuit independent of that of the

shirt 3.

  However, it may be advantageous to fill the web at the moment of filling the water jacket itself, and in this case, the envelope 13 is then provided with at least one filling orifice such as 15 a, 15 b, 15 c (Figure 1) in the lower part and less water

  a degassing orifice such as 16a and 16b in the upper part (FIG.

  3 and 5) In this case, the longitudinal partitions 14a, 14b present

  of course, also openings to allow the circulation of

  water at the time of filling, such as 17a, 17b (Figures 4 and 5).

  The role of the perforations 10 and the function of the envelope 13 have already been well defined. In the same way, the reasons for the shapes and the locations chosen for the orifices 10 and said envelope have already been specified above, all in the main concern. to avoid at best

  the harmful effects of the condensation phenomenon.

Claims (11)

  1) Heating boiler body with heat transfer fluid,   horizontally and at least partially enveloped by a jacket (3) for circulating said fluid, which jacket is provided with a flow (9) for the heated fluid and an inlet (8) for the cooled return fluid, while one end of the body is arranged to receive at least one burner (4) and the other end   is provided with an evacuation (5) of the combustion gases, boiler body   characterized in that the arrival of the return fluid is in the form of a perforated distribution tube (8) which is arranged in the upper part of the fluid jacket (3) and which is immersed in it by   the side opposite the burner (4) extending towards the side of the latter   deny, while the start (9) of the heated fluid is provided in the   lower part of the fluid jacket (3).   2) Boiler body according to claim 1, characterized in that the flow (9) of the heated fluid is effected on the opposite side to the burner (4).   3) Boiler body according to one of claims 1 and 2,   characterized in that the dispensing tube (8) is rectilinear and   arranged over substantially the entire length of the fluid jacket (3)   of, while it is closed at least partially at its end and   has a plurality of orifices (10) distributed along its length.   4) boiler body according to claim 3, characterized in that the orifices (10) of the tube (8) distribution are provided in   the upper half of the latter, that is, in the half-turn   born to the outer wall (2) of the fluid jacket (3).   Boiler body according to claim 4, characterized in that the orifices (10) of the distribution tube (8) are arranged by pairs.   6) Boiler body according to one of claims 4 and 5,   characterized in that the orifices (10) of the tube (8) distribution are closer to the side of the burner to be in greater numbers.   7) Boiler body according to one of claims 2 to 6,   characterized in that an orifice (11) is provided towards the end of the dispensing tube (8), and is arranged so as to open into the lower half thereof, i.e. in the half facing the inner wall (1) of the jacket (3) fluid to allow the evacuation of any impurities contained in the return fluid.   8) boiler body according to claim 7, characterized in that a deflector (12) is provided between the orifice (11) of evacuation   impurities and the inner wall (1) of the fluid jacket (3).   9) Heat transfer boiler body, available   horizontally and at least partially enveloped by a jacket (3) for circulating said fluid, which jacket is provided with a flow (9) for the heated fluid and an inlet (8) for the cooled return fluid, while one end of the body is arranged to receive at least one burner (4) and the other end   is provided with an evacuation (5) of the combustion gases, boiler body   characterized in that the inner wall (1) of the fluid jacket (3) is provided on the opposite side of the burner (4) 'with a closed peripheral casing (13) arranged at a short distance from said wall (1), while between the latter and said casing is provided a volume for a fluid, so as to form a thin sheet of fluid protruding into the shirt (3).   Boiler body according to Claim 9, characterized in that partitions (14a, 14b) are provided between the inner wall (1) of the fluid jacket (3) and the peripheral casing (13).   to reduce and / or eliminate any convection movement.   fluid that is between said wall (1) and said casing pe (13).   11) Boiler body according to one of claims 9 and 10,   characterized in that the casing (13) has at least one orifice   Filling (15 a, 15 b, 15 c) and at least one degassing orifice (16 a, - 16 b).   12) Boiler body according to all claims 10   and 11, characterized in that the partitions (14a, 14b) have   openings (17a, 17b) for filling the volume forming the web.   13) Boiler body according to one of claims 1 to 12,   characterized in that the inner wall (1) of the jacket (3) of   fluid is provided with a heat-exchange surface with full blades   (6) on its face turned towards the very inside of the body, that is to say say towards the flue gases.