EP2096355B1 - Installation d'alimentation d'un bruleur de carburant liquide, et chaudière correspondante - Google Patents

Installation d'alimentation d'un bruleur de carburant liquide, et chaudière correspondante Download PDF

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Publication number
EP2096355B1
EP2096355B1 EP08300115A EP08300115A EP2096355B1 EP 2096355 B1 EP2096355 B1 EP 2096355B1 EP 08300115 A EP08300115 A EP 08300115A EP 08300115 A EP08300115 A EP 08300115A EP 2096355 B1 EP2096355 B1 EP 2096355B1
Authority
EP
European Patent Office
Prior art keywords
circuit
pumping
pump
liquid fuel
burner
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP08300115A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2096355A1 (fr
Inventor
Aline Andre
Alexis Gelenne
Jean-Louis Loussert
Marcel Petit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baxi SA
Original Assignee
Baxi SA
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
Priority to DK08300115.6T priority Critical patent/DK2096355T3/da
Application filed by Baxi SA filed Critical Baxi SA
Priority to PT08300115T priority patent/PT2096355E/pt
Priority to ES08300115T priority patent/ES2355691T3/es
Priority to AT08300115T priority patent/ATE491117T1/de
Priority to DE602008003892T priority patent/DE602008003892D1/de
Priority to PL08300115T priority patent/PL2096355T3/pl
Priority to EP08300115A priority patent/EP2096355B1/fr
Priority to PCT/EP2009/052288 priority patent/WO2009106570A2/fr
Publication of EP2096355A1 publication Critical patent/EP2096355A1/fr
Application granted granted Critical
Publication of EP2096355B1 publication Critical patent/EP2096355B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/04—Feeding or distributing systems using pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/08—Preparation of fuel

Definitions

  • the present invention relates to an installation for supplying a liquid fuel burner capable of containing volatile substances, comprising a tank containing the fuel, a degasser connected to the tank by a dip tube, the degasser allowing the fuel to degas its substances. volatile, and a pump connected on the one hand a circuit for pumping the liquid fuel from the degasser to the burner, the fuel pumping circuit comprising a valve downstream of the pump, and on the other hand a pumping circuit volatile substances from the degasser to the tank, the pumping circuit volatile substances having a check valve downstream of the pump.
  • the invention also relates to a boiler comprising a burner and a plant mentioned above.
  • the figure 1 is very schematically a known installation for feeding a burner 1 liquid fuel, the fuel being capable of containing volatile substances. Such an installation is disclosed in EP 1 701 035 A1 .
  • the liquid fuel is for example domestic fuel oil may contain a greater or lesser amount of volatile substances, namely for example liquid hydrocarbons likely to pass into the gas phase or air intimately mixed with the fuel oil.
  • the installation conventionally comprises a tank 2 containing the fuel 4.
  • the tank 2 is generally connected to the free air 3 in the upper part.
  • the installation also comprises a degasser 15 connected to the tank 2 by a dip tube 16.
  • the plunger tube 16 is permanently immersed in the fuel 4 of the tank 2 and on the other hand opens into the degasser 15.
  • the degasser 15 allows the fuel to degas its volatile substances.
  • the degasser 15 is in the form of a closed chamber which permanently contains a volume 20 of liquid fuel and a variable volume 21 of gas containing the volatile substances passed in the gas phase, for example under the effect of the depression generated by pumping a pump 5, for example a positive displacement pump.
  • the pump 5 of the plant is connected on the one hand to a circuit for pumping the liquid fuel from the degasser 15 to the burner 1, and is connected on the other hand to a pumping circuit of the volatile substances from the degasser 15 to the tank 2.
  • the fuel pumping circuit is referenced 13 and 26, and the pumping circuit of the volatile substances is referenced 14 and 28.
  • the pumping circuit of the liquid fuel thus comprises a pipe 13 connecting on the one hand a first inlet 7 of the pump 5 and on the other hand the degasser 15.
  • the pipe 13 comes to collect the fuel near the bottom degasser 15. It may be in the form of a dip tube with a lower end 23 near a bottom of the degasser 15.
  • the pumping circuit of the volatile substances comprises a pipe 14 connecting on the one hand a second inlet 8 of the pump 5 and on the other hand the degasser 15.
  • the pipe 14 is in the form of a tube with an end 24 at the top of the degasser, generally in the variable volume 21.
  • the internal space of the degasser 15 is depressed by the suction of the pump 5 at its inlets 7 and 8, which causes a pumping effect of the fuel 4, through the plunger tube 16, inside the the tank 2, and a suction of the degassed liquid fuel in the volume 20 occupying the lower part of the degasser 15 through the pipe 13 and the inlet 7 of the pump. It is understood that the inlet 7 is fed exclusively with liquid fuel.
  • the pump 5 draws through line 14 and inlet 8, and depending on the level of volume 20 with respect to end 24, either only volatile substances or liquid fuel, or a mixture of both.
  • the pumping circuit of the liquid fuel also comprises a pipe 26 connecting on the one hand a first outlet 11, associated with the first inlet 7, and on the other hand the burner 1.
  • the valve 27 also comprises a valve 27 located downstream of the pump 5 and upstream of the burner 1.
  • the valve 27 can close the pipe 26 or open.
  • the valve 27 may be constituted for example by a solenoid valve.
  • the circuit for pumping volatile substances from the degasser 15 to the tank 2 comprises a pipe 28 back to the tank 2 connecting on the one hand a second outlet 12 of the pump 5, associated with the second inlet 8, and on the other hand the tank 2.
  • non-return valve 32 located downstream of the pump 5 and upstream of an end 29 of the pipe 28.
  • a certain volume 30 liquid fuel surmounted by a certain volume of gas 31 remains permanently above the outlet 12 of the pump.
  • a certain volume 33 of liquid fuel preferably remains permanently above the nonreturn valve 32.
  • outlet 11 is fed only with liquid fuel, while the outlet 12, associated with the inlet 8, is supplied sometimes with volatile substances, sometimes with liquid fuel, sometimes with a mixture of the two, depending on the level of the fuel.
  • the installation comprises a fan 103 for supplying combustion air 4 'into the burner 1.
  • the fan 103 comprises for this purpose a paddle wheel 1031.
  • the pipe 26 ends in the burner 1 in the form of an end 277 forming a fuel intake duct.
  • the conduit 277 opens to a centrifugation head 80 located in a combustion bowl of the burner 1.
  • the centrifugation head 8 is rotatably mounted at the end of the conduit 277, and is fixed to the blades 140.
  • the assembly consisting of the centrifugation head 80 and the blades 140 can therefore rotate at the end of the conduit 277.
  • the liquid fuel pumped from the conduit 277 strikes the centrifugation head 80, and migrates to a radially outer periphery of the centrifugation head, then centrifugally escapes through this periphery.
  • the combustion air 4 'then inflects the trajectory of the fuel droplets, as shown by the arrows 171.
  • the mixture of the liquid fuel thus sprayed by centrifugation and combustion air driven by the fan 103, can ignite and produce the desired combustion in the combustion bowl of the burner 1.
  • a gap 22 permits the suction of combustion gases which cool the flame in the burner and lower the NOx (nitrogen oxides) level.
  • the pump used is generally a positive displacement pump, that is to say a pump in which the fluid flow is achieved through the volume variation of a cavity which alternately sucks and represses the fluid.
  • the operating mode of the positive displacement pump therefore causes jerks in the fuel distribution.
  • jolts are factors of detachment of the flame of the burner.
  • the burner can therefore go out unwanted.
  • the drive motor drives the fan and the pump synchronously.
  • the known installation does not allow a modulation of the power of the burner from 0 to 100%.
  • This proportionality advantageous under certain conditions, can cause problems in certain other conditions of use of the burner, which can cause instability, or even extinction of the flame. This is the case especially at high altitude - because the oxygen content in the combustion air is modified compared to the proportions of the standard conditions of use of the burner.
  • the invention proposes to overcome at least one of these disadvantages.
  • a feed installation of a liquid fuel burner may contain volatile substances, having a tank containing the fuel, a degasser connected to the tank by a dip tube, the degasser allowing the fuel to degas its volatile substances, a pump connected on the one hand a pumping circuit of the liquid fuel from the degasser to the burner, the fuel pumping circuit comprising a solenoid valve downstream of the pump; and on the other hand a circuit for pumping volatile substances from the degasser to the tank, the pumping circuit of the volatile substances comprising a non-return valve downstream of the pump, said installation characterized in that it comprises a return circuit connecting on the one hand the pumping circuit of the liquid fuel, upstream of the solenoid valve but downstream of the pump, and on the other hand the pumping circuit of the volatile substances .
  • the invention also relates to a boiler comprising a burner and an installation according to the invention.
  • the invention has many advantages.
  • the return circuit allows the installation to operate with an oversized pump compared to the flow required for the burner feed, in order to improve the suction characteristics of the fuel oil from the tank.
  • the adjustment of the fuel flow independently of the oxidant flow is also offered, in particular thanks to the return circuit, which returns a portion of the fuel from the pump to the tank. It is thus possible to independently adjust the flow rate of fuel with respect to the air flow. It is therefore possible to choose and modify the proportions of the fuel mixture. This provides a better operation of the burner under certain conditions, especially at high altitude.
  • the installation thus makes it possible to no longer have a perfect constancy of the carbon dioxide rate over the entire range of its use, but makes it possible to have a higher rate, ie a lower proportion of air, especially at low power. This lower proportion of air favors the phenomenon of condensation of the combustion products, a phenomenon sought at low power.
  • the installation runs silently even during the startup phase.
  • the invention notably allows an increase in the stability of the flame. Indeed, a clipping of liquid fuel flow variations is possible thanks to the damper.
  • the increase in pressure at the damper due to the presence of the adjustment valves, promotes this clipping.
  • the control of the fan and pump drive motor allows control of the rotational speed of the motor.
  • This control is an additional element allowing to modulate in particular the fuel flow and the power of the burner. It is thus possible to adjust the range of fuel flow around which one oscillates during the pumping, and thus position themselves better according to the desired combustion conditions.
  • the modulation is at least between 40% and 100% of the total power of the burner.
  • a first possible embodiment of an installation is visible at the figure 2 .
  • the installation includes the main elements of the known installation of the figure 1 , and the common elements that are not necessary to the understanding of the operation of the first embodiment are not repeated in detail for the sake of clarity and brevity.
  • the return circuit allows the installation to operate with an oversized pump with respect to the flow rate required for fueling the burner. Oversizing the pump improves the suction characteristics of the fuel oil from the tank.
  • the return circuit also makes it possible to regulate the fuel flow rate independently of the oxidant flow, for example to modify the fuel mixture and / or the carbon dioxide content of the combustion. It is thus possible to obtain a better operation of the burner under certain conditions, in particular at high altitude or for a better condensation of the products of the low-power combustion.
  • the installation comprises a flow control valve 271 between the pump 5 and the valve 27, and a flow control valve 261 in the return circuit 260.
  • each valve allows the adjustment of the flow rate through the circuit on which it is located.
  • Valves 271 and 261 are set once for each installation.
  • a second possible embodiment of an installation is visible at the figure 3A .
  • the installation includes the main elements of the known installation of the figure 1 , and the elements in common that are not necessary for the understanding of the operation of the second embodiment are not repeated in detail, for the sake of clarity and brevity.
  • the installation comprises a damper 262 in the circuit 26 for pumping the liquid fuel, between the pump 5 and the solenoid valve 27.
  • the damper 262 is capable of clipping the pressure variations in the pumping circuit of the liquid fuel, which stabilizes the flame in the burner 1.
  • the figure 3B shows schematically a first possible example of a damper 262 used in the installation.
  • the damper 262 comprises a bypass 2621 with respect to the circuit 26 for pumping the liquid fuel and a flexible membrane 2622 able to move to damp the pressure variations due to the displacement pump 5.
  • the flexible membrane 2622 is mounted on a chamber 2623 climb on the bypass.
  • FIG 3C schematically shows a second possible example of a damper 262.
  • the circuit 26 passes through the volume of the damper 262, and therefore does not form a derivation, but a "series" geometry.
  • the circuit opens into a chamber 2623 of a flexible membrane 2622, the membrane being able to move to the other end of the chamber to damp the pressure variations due to the positive displacement pump.
  • the circuit 26 then resumes opening out of the damper from the middle of the chamber 2623.
  • a third possible embodiment of an installation is visible at the figure 4 .
  • the installation includes the main elements of the known installation of the figure 1 , and the elements in common which are not necessary for the understanding of the operation of the third embodiment are not repeated in detail, for the sake of clarity and brevity.
  • the installation also comprises a fan 103 for supplying an oxidizer 4 'to the burner 1.
  • the installation also comprises a synchronous drive motor 102 for the pump 5 and the fan 103.
  • the output shaft 6 of the motor 102 drives both the fan 103 and the pump 5.
  • the installation comprises a control 104 of the drive speed of the motor 102 so that the combustion power of the burner can be modulated.
  • control of the rotational speed of the engine makes it possible to modulate in particular the fuel flow rate and the power of the burner, at least between 40% and 100% of the total power of the burner.
  • the control 104 can be manual, mechanical, electromechanical, pneumatic or electronic.
  • a fourth possible embodiment of an installation is visible at the Figure 5A .
  • the installation includes the main elements of the known installation of the figure 1 , and the elements in common which are not necessary for the understanding of the operation of the fourth embodiment are not repeated in detail, for the sake of clarity and brevity.
  • the start-up circuit 263 authorizes the return of fuel from the liquid fuel pumping circuit 26 to the pumping circuit 28 for the volatile substances, in particular during the start-up phase of the burner (a phase also called "pre-scanning" by the man of career).
  • the motor 102 driving the pump 5 rotates, but the burner control has not yet authorized the opening of the solenoid valve 27.
  • the solenoid valve 27 is thus closed on the channel supplying the circuit 26. towards the centrifugation head, while the circuit 263 is conducting, either by opening the valve 2631 with non-return valve ( Fig. 5B ), or because the third channel of the valve is open ( Fig. 5C ).
  • the function of the circuit 263 is provided by the circuit 260.
  • a fifth possible embodiment is shown schematically in the figure 6 .
  • the damper 262 is also located upstream of the adjustment valves 261 and 271.
  • the fifth embodiment represents a preferred embodiment, but it is understood that any combination of the first embodiment, and / or the second embodiment, and / or the third embodiment described above is possible. .
  • FIG. figure 7 a preferred example of a sixth possible embodiment is schematically shown in FIG. figure 7 .
  • the burner comprises a centrifugation head 80 and blades 140 for rotating the head, as shown in all the figures, for example.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
EP08300115A 2008-02-26 2008-02-26 Installation d'alimentation d'un bruleur de carburant liquide, et chaudière correspondante Not-in-force EP2096355B1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
PT08300115T PT2096355E (pt) 2008-02-26 2008-02-26 Instalação para alimentação de um queimador de combustível liquido, e caldeira correspondente
ES08300115T ES2355691T3 (es) 2008-02-26 2008-02-26 Instalación de alimentación de un quemador de carburante líquido, y caldera correspondiente.
AT08300115T ATE491117T1 (de) 2008-02-26 2008-02-26 Vorrichtung zur versorgung eines brenners mit flüssigbrennstoff und entsprechender kessel
DE602008003892T DE602008003892D1 (de) 2008-02-26 2008-02-26 Vorrichtung zur Versorgung eines Brenners mit Flüssigbrennstoff und entsprechender Kessel
DK08300115.6T DK2096355T3 (da) 2008-02-26 2008-02-26 Anlæg til forsyning af en brænder med flydende brændstof og tilhørende kedel
EP08300115A EP2096355B1 (fr) 2008-02-26 2008-02-26 Installation d'alimentation d'un bruleur de carburant liquide, et chaudière correspondante
PL08300115T PL2096355T3 (pl) 2008-02-26 2008-02-26 Instalacja zasilania palnika paliwem płynnym i odpowiedni kocioł
PCT/EP2009/052288 WO2009106570A2 (fr) 2008-02-26 2009-02-26 Installation d'alimentation d'un bruleur de carburant liquide, et chaudiere correspondante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08300115A EP2096355B1 (fr) 2008-02-26 2008-02-26 Installation d'alimentation d'un bruleur de carburant liquide, et chaudière correspondante

Publications (2)

Publication Number Publication Date
EP2096355A1 EP2096355A1 (fr) 2009-09-02
EP2096355B1 true EP2096355B1 (fr) 2010-12-08

Family

ID=39743794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08300115A Not-in-force EP2096355B1 (fr) 2008-02-26 2008-02-26 Installation d'alimentation d'un bruleur de carburant liquide, et chaudière correspondante

Country Status (8)

Country Link
EP (1) EP2096355B1 (pt)
AT (1) ATE491117T1 (pt)
DE (1) DE602008003892D1 (pt)
DK (1) DK2096355T3 (pt)
ES (1) ES2355691T3 (pt)
PL (1) PL2096355T3 (pt)
PT (1) PT2096355E (pt)
WO (1) WO2009106570A2 (pt)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249885A (en) * 1978-07-20 1981-02-10 Vapor Corporation Heavy fuel oil nozzle
FR2626353B1 (fr) * 1988-01-26 1990-06-29 Chauffe Cie Gle Dispositif de regulation de la viscosite du fuel lourd d'alimentation de bruleurs de chaudiere et procede de regulation de la viscosite du fuel lourd d'alimentation de chaudiere
FR2882795B1 (fr) * 2005-03-01 2007-05-11 Baxi S A Sa Pompe et installation d'alimentation d'un dispositif consommateur de liquide au moyen d'une telle pompe

Also Published As

Publication number Publication date
WO2009106570A2 (fr) 2009-09-03
DE602008003892D1 (de) 2011-01-20
PT2096355E (pt) 2011-03-02
PL2096355T3 (pl) 2011-05-31
WO2009106570A3 (fr) 2010-07-01
ATE491117T1 (de) 2010-12-15
DK2096355T3 (da) 2011-03-14
EP2096355A1 (fr) 2009-09-02
ES2355691T3 (es) 2011-03-30

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