FR2507293A1 - HIGH YIELD BOILER WITHOUT BLOWER - Google Patents

Abstract

HIGH-EFFICIENCY BOILER WITH A BURNER 2, A HEAT EXCHANGER 3 AND A MEANS FOR THE SUPPLY OF AIR AND THE EXHAUST OF FUMES. THE SUPPLY AND EVACUATION MEANS FORM A CLOSED CIRCUIT AND INCLUDE A HOT GAS COLUMN 8 CONNECTED DIRECTLY TO BURNER 2 AND WHOSE THERMAL DRAFT GENERATED CAN AT LEAST OVERCOME THE RESISTANCE THROUGH THE HEAT EXCHANGER. BY THIS CONSTRUCTION, THE BOILER CAN OPERATE WITHOUT THE NEED FOR A BLOWER TO ASSIST IN THE EXHAUST OF THE FUMES. THE INVENTION CAN BE USED FOR BOILERS OF ALL HEATING CAPACITIES.

Description

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  The subject of the invention is a boiler with high efficiency,

without blower.

  The invention relates to a boiler with high efficiency,

  with a capacity of up to about 35 KW, and including a br

  their, a heat exchanger and a means of admission of air

and evacuation of fumes.

  In the case of gas boilers, the expression "large

  This means that at least the service yield is 88% of the gross calorific value, unlike normal boilers.

  o the yield is of the order of 70-75% A consequence of the re-

  high is that the temperature of the fumes

  requiring special measures to ensure that these fu-

  In a normal boiler, the draft generated in the flue can be used to overcome the resistance through the heat exchanger, due to the relatively high temperature of the flue gases exhausted. the draft of the chimney are often separated Seen from the other by a compulsory register which authorizes the admission

  of air coming from space It must be considered that in the

  high efficiency dies, with a heat exchange surface

  magnified, there is more heat that is provided by the fu-

  With this in mind, high efficiency boilers equipped with a two-part heat exchanger placed next to one another the other and connected by a curved flue section, are equipped with a blower in the circuit air / fumes It should be noted that the incorporation of a blower in the circuit generates significant drawbacks It is noted for this purpose , that the use of a wind tunnel means that an electric-electric

  should be provided with regulations and

  positive safety measures that increase the cost price while

  in addition, an increased risk of failure.

  An object of the present invention is to provide a high efficiency boiler where fumes can be evacuated.

  Reliably, without the need to use a blower.

  According to the present invention, the boiler with high efficiency

  This means comprises a hot gas column connected directly to the burner, the thermal output of which is generated.

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  overcomes the resistance generated by the heat exchanger, tan-

  say that a means is also provided to limit the formation of

  heat through the hot gas column.

  According to these characteristics, a closed thermal circuit, relatively

  importantly, in the form of a column of hot gases, is created

  in the high-efficiency boiler, for feeding and

  which are arranged close to each other.

  provision avoids the use of a register between the heat exchanger

  their and the flue, while creating additional conditions

  so that smoke evacuation is ensured without outside help

  One of the advantages of this arrangement, referred to as a balanced flue system, is that all pressure variations in the air / flue circuit are eliminated by avoiding the defective operation of the hot gas column.

  In fact, the efficiency of the thermal generator is optimum.

  positions eliminate the known means provided for in the

  boiler, above the burner, and intended to use heat efficiently to heat its own In a preferred embodiment of the invention, the high efficiency boiler is adapted to operate using the gas

  This boiler is characterized by a change in

  The temperature decreases slowly in the hot gas column, depending on a height depending on its capacity. For example, this height varies from about 20 cm or more, for a maximum capacity of one boiler, up to 8 KW. about 35 cm or more, in the case of a maximum capacity of a boiler, of 35 KW It is also possible to realize a high efficiency boiler with vertical dimensions that hardly differ from the known boilers In a variant, the meaning of flow of the supply and discharge of air and fumes, is essentially vertical to minimize the resistance of the circulation In another

  Alternatively, the design of the high efficiency boiler is

  significantly improved with a sheath construction of the hot gas column, calculated so that the emission of heat from radiation and convection, is minimal The heat transmission through the hot gas column can be further improved if the sheath of the hot gas column includes an insulator or is

  established with a bad conductor material It is conceivable that

  According to the invention, the dimensions of the high-efficiency boiler are minimized, with an optimal effect, if the column (hot gases which is limited at the bottom by the burner) is limited and

high through the heat exchanger.

  It is also possible, in the context of the invention, to produce the heat exchanger in the form of a vertical tube

  double-walled, arranged above the burner.

  To fix the object of the invention, without however the

miter, in the attached drawing.

  Figure 1 is a schematic view of a first realization of a boiler 10 according to the invention; FIG. 2 is a schematic view of an embodiment

  variant of a boiler according to the invention.

  The high efficiency boiler illustrated in FIG. 1 and gas-fired, (1) comprises a burner (2), a heat exchanger

  heat (3) and a flue gas recovery space (4) in comm.

  with flue (5) Between the burner (2 J and the heat exchanger (3) is provided with a water inlet pipe (6) and a water outlet pipe (7), a space (8) having a height

  sufficient to form a thermal generator in the form of a

  the amount of hot gas proportional to the capacity of the boiler (l) For example, this height is about 20 cm or fold in the case of a small boiler with a maximum capacity of about 8 KW, and 35 cm or more, in the case of a big cl

  with a maximum capacity of approximately 35 KW.

  In this column of hot gases, the area located next to

  the burner (2), has the highest temperature.

  When the hot gas column is irregular and disturbed, the capacity of the thermal generator, determined by the temperature and the height of the hot gas column, must also take into account the temperature decrease in the column which must be reduced. This disadvantage is abolished by constructing the boiler sheath near the hot gas column, according to the burner used, so that the sum of heat transfer by radiation and

  convection, which is minimal, but does not exclude the use of

  In addition, it is also possible to equip the boiler sheath with insulation or material.

bad driver.

  The boiler (1) is furthermore equipped with a closed circuit for supplying air and exhausting flue gases. For this purpose, an air supply duct (9) is provided with an inlet

  located near the exit of the flue (5), resulting

  to the atmosphere, while the two pipes are

  placed in a boiler casing (1) As a result of this arrangement of the air supply duct (9), the boiler is completely sealed. Such a construction is known.

  under the name "balanced flue system", which, together with

  ration with the thermal generator, makes it possible to evaluate the

  flue gas in a high efficiency boiler, without

  have to resort to additional aid, such as

  Since the "balanced flue system" suppresses differential pressure variations between the feed and

  evacuation, the register can be deleted.

  of hot gases acting as a heat generator, is able to provide a sufficient draft for adequate supply and evacuation of air and fumes,

smooth operation of the system.

  FIG. 2 illustrates an alternative embodiment of the boiler according to the invention. According to this variant, the high-efficiency boiler (11) comprises a heat exchanger (13) formed by a double-walled tube constituting a space that shrinks ( 14) above the burner (12), and which continues with a

  pipe (15) of constant section, comparable to a flue.

  The water circulating in the double-walled tube forms a heat exchanger and is conveyed by a supply pipe (16)

  and an evacuation pipe (17) The space (14) and the channel

  (15) can be of any form, in order to optimize the

  heat transfer between fumes and water.

  Between the burner (12) and the narrowed space (14), is also

  formed a space (18) of constant cross section and of sufficient height according to the capacity of the boiler, to ensure the formation of a thermal generator in form

a column of hot gases.

  Due to the particular shape of the heat exchanger

  (13), the emission of the hot gas column is favorable

  the boiler can be constructed

  so that the sum of heat transfer by

  radiation and convection, which is minimal.

  An air duct (19) is further provided with an inlet outside the space where the boiler (11) is 4 -

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  installed, and close to the flue (15), so as to form a closed circuit of supply and discharge The pipeline

  (19) and the flue (15) arranged concentrically

  only extend outside an envelope (20).

  It is obvious that this exchanger can also be applied in the case of other fluids, such as a heat exchange air / air. The invention is in no way limited to that of these modes of application, nor to those of the embodiments of these various parts which have been especially indicated; she

  on the contrary, embraces all variants.

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Claims (7)

R E V E N D I C A T I O N $   -1 High efficiency boiler, with a capacity of up to about 35 KW, and comprising a burner (2), a heat exchanger (3) and a means for supplying air and exhausting fumes, characterized in that the supply and evacuation means form a closed circuit and comprise a column of hot gases (8) directly connected to the burner (2), and whose generated thermal output can overcome at least the resistance generated by the exchanger of heat, means being provided for   limit the formation of heat by the column of hot gases.   -2 high efficiency boiler according to claim 1, adapted to operate using the gas as a fuel, characterized by a temperature variation which decreases in the hot gas column (8) established at a height depending on its capacity and ranging from approximately 20 cm or more, in the case of a maximum boiler capacity, from 8 KW to 35 cm or more,   in the case of a maximum boiler capacity, 35 KW.   High-efficiency boiler according to claim 1   or 2, characterized in that the direction of flow in the food   tation and evacuation of air and fumes, is essentially vertical.   -4 High efficiency boiler according to any one of   claims 1, 2 or 3, characterized in that the column   of hot gas (8) has a construction sheath such as radiation and convection heat emission, is minimal.   -5 High efficiency boiler according to any one of   Claims 1, 2, 3 or 4, characterized in that the sheath   of the hot gas column is established with an insulator or a bad conductor material.   -6 High efficiency boiler according to any one of   claims 1, 2, 3, 4 or 5, wherein at least one of   part of the heat exchanger is placed essentially   tically above the burner (2) (12), which is characterized in that 7 2507293   the hot gas column (18) is limited at the bottom by the burner   (2) (12), and at the top, by the heat exchanger (3) (13).   -7 High efficiency boiler according to any one of   claims 1, 2, 3, 4, 5 or 6, characterized in that   the heat exchanger (3) (13) comprises a vertically disposed double-walled tube of appropriate cross section, the   burner (12) being at the bottom of this tube (13).