EP2129966B1 - Brûleur poreux à hydrogène sans prémélange - Google Patents

Brûleur poreux à hydrogène sans prémélange Download PDF

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Publication number
EP2129966B1
EP2129966B1 EP08775565.8A EP08775565A EP2129966B1 EP 2129966 B1 EP2129966 B1 EP 2129966B1 EP 08775565 A EP08775565 A EP 08775565A EP 2129966 B1 EP2129966 B1 EP 2129966B1
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EP
European Patent Office
Prior art keywords
premixing
porous element
burner according
less hydrogen
hydrogen 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.)
Active
Application number
EP08775565.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2129966A2 (fr
Inventor
Jérôme Colin
André NICOLLE
Willi Nastoll
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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Publication of EP2129966A2 publication Critical patent/EP2129966A2/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C13/00—Apparatus in which combustion takes place in the presence of catalytic material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C99/00—Subject-matter not provided for in other groups of this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C99/00—Subject-matter not provided for in other groups of this subclass
    • F23C99/006—Flameless combustion stabilised within a bed of porous heat-resistant material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/18—Radiant burners using catalysis for flameless combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/9901—Combustion process using hydrogen, hydrogen peroxide water or brown gas as fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/101—Flame diffusing means characterised by surface shape
    • F23D2203/1012—Flame diffusing means characterised by surface shape tubular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/105—Porous plates

Definitions

  • the invention relates to a new porous hydrogen burner intended to equip different types of furnaces requiring precise control of the heat flow, in particular steam reforming furnaces of natural gas or naphtha intended in particular for the production of hydrogen.
  • hydrogen burner must be understood in a broad sense and means that the fuel of the present burner may be pure hydrogen, but more generally any gas containing hydrogen.
  • the oxidant may be any gas containing oxygen, in particular air, but also enriched or depleted oxygen air.
  • the oxidant can even in a particular case be pure oxygen.
  • This new burner is in the category of porous burners without premix, because it has a porous element separating the fuel side of the oxidant side, the combustion taking place either inside the porous, or in the vicinity of its outer surface.
  • the burner object of the present invention is a porous burner in the sense that the fuel and the oxidant are introduced on either side of a porous element (also called “porous” later), the internal surface of the porous element being in contact with the fuel, and the outer surface of the porous element being in contact with the oxidant.
  • a porous element also called “porous” later
  • the burner according to the invention is therefore a porous burner, without premix, further having a fuel dispenser member which makes it possible to control the heat flow according to the main dimension of said burner, which will conventionally be called the length of the burner.
  • the thermal flow is controlled by a set of orifices pierced on the surface of the distributor and grouped into sections. Each section groups the orifices of the same diameter.
  • the burner according to the present invention will have a fuel distributor having at least two sections, each section being characterized by a given orifice diameter and occupying a certain fraction of the length L of the burner.
  • the fuel and the oxidant arriving from the two opposite sides of the porous element does not play the role of a pre-mixing member, but instead of a separation zone of the fuel and the oxidizer.
  • the hydrodynamic conditions, and in particular the fuel velocity in the annular space separating the distributor from the porous element plays an important role since the stability of the flame is ensured in a restricted range of flow rates. If the flow rate is too low, the flame may extinguish, while if the flow is excessive, the flame may be blown.
  • the patent US 5,810,577 discloses a porous catalytic burner having two combustion chambers, the first combustion chamber being fed with the fuel and the second chamber being fed with the combustion effluent from the first chamber, the two chambers being separated by a porous catalytic barrier, a porosity greater than 50%, and having a pore size of between 1 nm and 1 mm, the thickness of said barrier being between 0.05 and 10 mm.
  • the patent US 6,699,032 discloses a device for storing a fuel gas which comprises a combustion system of gases escaping through a safety valve, said combustion system consisting of a burner having a porous body surrounding a fuel distributor. The distribution of the fuel is uniform and the porous body acts as a zone of diffusion or mixing between the fuel and the oxidant.
  • the patent WO 2006/071350 A discloses a fuel cell utilizing a catalytic combustion system for combustion between hydrogen and oxygen.
  • the hydrogen burner according to the present invention is a burner without premix, of cylindrical geometry of length L and of diameter D, with an L / D ratio of between 10 and 500, and preferably between 30 and 300.
  • the burner according to the invention has a central hydrogen distributor with a non-uniform orifice distribution, and has a porous annular element surrounding the central distributor at least over its entire length L, the thickness of said porous element being between 0.1 and 2 cm, the inner surface of said porous being located at a distance from the central distributor of between 0.5 cm and 10 cm.
  • the distributor of the burner according to the present invention is divided into a number of sections, the length of each section ranging from 10 mm to 2 m, and preferably from 20 mm to 1.5 m.
  • the hydrogen burner according to the present invention has a central fuel distributor, said central distributor is divided into at least two sections, each section having orifices of the same diameter, and at least one section having orifices with a diameter different from that of the other sections.
  • the central distributor is divided into at least two sections, each section having orifices of increasing diameter with the axial distance along the distributor, in the direction of flow of the fuel.
  • the central distributor is divided into at least two sections, each section having orifices of increasing diameter according to an exponential type law, in the direction of the fuel flow.
  • the center to center distance of the orifices of the same section is generally between 0.5 cm and 50 cm, and preferably between 1 cm and 20 cm.
  • the length L of the burner is generally between 2 and 15 m, and preferably between 5 and 12 meters.
  • the porous element forming an integral part of the burner according to the invention preferably has a porosity of at least 50%, and more preferably of at least 80%.
  • the porous element may in certain cases have at least two zones of different porosity.
  • the fuel usually hydrogen, is preferably introduced into the central distributor at a pressure of between 0.1 and 10 MPa.
  • the oxidant is preferably introduced into a first annular space surrounding the porous element of the burner, and the combustion gases are collected in a second annular space surrounding the first annular space.
  • the oxidant preferably circulates in a direction substantially parallel to the longitudinal axis of the burner at a speed of between 1 m / s and 100 m / s, and preferably from 3 to 80 m / s.
  • the average radial velocity of the fuel relative to the inner surface of the porous material is generally between 2 mm / s and 100 cm / s, and preferably between 0.5 cm / s and 10 cm / s.
  • the burner according to the present invention can be applied to any type of furnace requiring a well controlled heating of the tubes over their entire length, in particular steam reforming furnaces of natural gas or naphtha.
  • the figure 3 gives a more precise view of the fuel distributor and is valid both in the basic configuration and in the advanced configuration.
  • the dispenser will generally be cylindrical in shape with an L / D ratio of between 10 and 500.
  • this dispenser is fed with the fuel which is available at a pressure preferably of between 0.1 and 10 MPa.
  • the fuel may be any combustible gas containing hydrogen in any proportion, and possibly be pure hydrogen.
  • the inner surface is defined as being the closest to the dispenser.
  • the porous element surrounds the dispenser in the sense that it has at least the same length as the dispenser, and in some cases, a longer length that allows to clear a space between the end of the dispenser and the inner wall of said porous allowing to improve the degree of combustion of the combustion gas.
  • the porosity of the porous element is at least 50% and preferably greater than 80%. Said porosity is defined as the ratio of the void volume to the geometric volume of any part of the porous element.
  • This porosity is generally homogeneous over the entire length of the porous element, but it is possible to differentiate it on certain elements of length. For example one can have a first fraction of the length of the porous with a porosity P1 and a second fraction of the length of the porous with a porosity P2 different from P1.
  • This porous element will typically consist of a metal foam made of an alloy of different metals including for example iron, chromium, aluminum, titanium or zirconium, and in some cases yttrium.
  • An example of such an alloy is the FeCrAIY material sold by the company PORVAIR.
  • the porous element may also consist of a ceramic foam, for example mullite or cordierite.
  • the pore size is generally between 0.2 and 0.6 mm.
  • the space separating the distributor (1) from the porous element (2) plays an important role in the operation of the burner according to the invention since the fuel from the distributor has a certain longitudinal profile of flux it must best retain at the entrance to the porous element. To do this, the linear velocity of the fuel within the annular space should preferably have a sufficiently high value, since it is known that too low speeds would promote the longitudinal diffusion of the fuel within the space. annular (3).
  • obtaining the combustion inside the porous element or in the vicinity of its external surface is generally more easily achieved when the fuel velocity inside the porous element preferably remains greater than the diffusion rate of the oxidant.
  • the fuel velocity must not exceed a limit value to allow the oxidant to diffuse inside the porous element.
  • a fuel velocity at the entrance of the porous element of between 2 mm / s and 1.0 m / s, and preferably between 0.5 cm / s and 10 cm / s.
  • This speed is precisely defined as the speed taken along an axis perpendicular to the longitudinal axis of the burner, which will conventionally be called radial velocity. This speed is therefore normal to the porous surface.
  • the volume outside the porous element (2) is divided by means of a wall (6) substantially parallel to the outer surface of the porous element (2) and of shape substantially cylindrical, in a first space (4) between the outer surface of the porous element (2) and said wall (6), and a second space (5) corresponding to the volume located outside the wall (6).
  • This volume outside the wall (6) can be limited by a second wall (7) substantially parallel to the wall (6) and delimiting between said wall (6) and said wall (7) the second space (5).
  • this second space (5) will be a space communicating with the first space (4) by its lower part, the substantially vertical wall (7) being then connected to a substantially horizontal wall (8), the walls (7). and (8) then constituting a chamber enclosing the burner according to the invention.
  • the oxidant is admitted into the space (4), joins the fuel inside the porous element (2) or in the vicinity of the outer surface of said porous element (2). ) producing a combustion which generates combustion gases which are found in the first space (4) and are evacuated by passing through the second space (5).
  • the linear velocity of the oxidant introduced into the space (4) is between 1 and 100 m / s and preferably between 3 m / s and 80 m / s, and the linear velocity of circulation of the combustion gases in the space (5) is preferably between 2 and 150 m / s.
  • the following example is intended to demonstrate the effects of the burner according to the invention from the point of view of fuel consumption and temperature in a direction joining the centers of the burner and the tube to be heated.
  • Tubes (T) containing the fluid to be heated and burners according to the invention (B) are staggered with a square pitch.
  • the distance separating the center of the burner from the center of the tube to be heated is 210 mm.
  • the length of the burners is 12 meters, the distributor of each of the burners having a length of 10 meters.
  • the L / D ratio of each burner is 120.
  • the distance between the distributor and the inner wall of the porous element is 15 mm.
  • the thickness of the porous element is 1 cm.
  • the distributor is divided into 10 sections of length 1m. Each section generates a total surface of the orifices arranged on the section considered.
  • a section is defined as a dispenser portion having orifices of the same diameter.
  • the figure 5 shows that in the first case, the radial velocity (Ur) of the fuel at the outer surface of the porous element has a large variation along the longitudinal axis (d) of the burner.
  • the curve corresponding to the first case is dotted on the figure 5 .
  • the radial velocity (Ur) of the fuel is much more homogeneous along the longitudinal axis (d) of the burner. This better homogeneity of the radial velocity (Ur) ensures a substantially constant heat flow throughout the tube.
  • the curve corresponding to this second case is in full line on the figure 5 . This point is particularly important with tubes whose length is 12 meters.
  • the figure 6 represents the evolution of the hydrogen consumption Y (H2), according to the direction joining the center of the burner to that of the tube to be heated, said direction center to center.
  • the origin of the distances (r) in this direction is conventionally chosen on the external surface of the porous element of the burner considered.
  • the values Y (H2) are read on the y-axis on the left of the figure 6 .
  • the figure 6 shows that the amount of hydrogen Y (H2) decreases rapidly in the center-to-center direction. Almost 90% of the hydrogen introduced is consumed over a distance of 10 mm, which means that the combustion zone is close to the porous zone. We are in the case of a well localized combustion.
  • This temperature has a maximum of 1800 K in the vicinity of the outer surface of the porous element, or in the case of the example, 10 mm from said outer surface.
  • the temperature T then decreases to a value of less than or equal to 1200 K. This value is compatible with non-refractory materials, which is particularly interesting in the choice of tube metallurgy and in the economics of the process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Combustion Of Fluid Fuel (AREA)
EP08775565.8A 2007-02-26 2008-02-14 Brûleur poreux à hydrogène sans prémélange Active EP2129966B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0610999A FR2913097B1 (fr) 2007-02-26 2007-02-26 Bruleur poreux a hydrogene sans premelange
PCT/FR2008/000207 WO2008122707A2 (fr) 2007-02-26 2008-02-14 Bruleur poreux a hydrogene sans premelange

Publications (2)

Publication Number Publication Date
EP2129966A2 EP2129966A2 (fr) 2009-12-09
EP2129966B1 true EP2129966B1 (fr) 2019-04-17

Family

ID=38529713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08775565.8A Active EP2129966B1 (fr) 2007-02-26 2008-02-14 Brûleur poreux à hydrogène sans prémélange

Country Status (8)

Country Link
US (1) US9739482B2 (ru)
EP (1) EP2129966B1 (ru)
JP (1) JP5331713B2 (ru)
KR (1) KR101435699B1 (ru)
CA (1) CA2675989C (ru)
FR (1) FR2913097B1 (ru)
RU (1) RU2451877C2 (ru)
WO (1) WO2008122707A2 (ru)

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FR2913097B1 (fr) 2007-02-26 2009-04-24 Inst Francais Du Petrole Bruleur poreux a hydrogene sans premelange
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RU2517721C2 (ru) * 2013-02-01 2014-05-27 Геннадий Леонидович Багич Фитильная горелка и способ изготовления фитиля
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DE102014209529A1 (de) * 2014-05-20 2015-11-26 Siemens Aktiengesellschaft Verbrennung von Lithium bei unterschiedlichen Temperaturen, Drücken und Gasüberschüssen mit porösen Rohren als Brenner
WO2016009385A1 (en) * 2014-07-17 2016-01-21 E.Hy. Energy Hydrogen S.R.L.S. Apparatus for producing electricity, and related process
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Also Published As

Publication number Publication date
JP2010519501A (ja) 2010-06-03
US20110027739A1 (en) 2011-02-03
FR2913097A1 (fr) 2008-08-29
WO2008122707A3 (fr) 2008-11-20
CA2675989C (fr) 2015-09-15
KR101435699B1 (ko) 2014-09-01
JP5331713B2 (ja) 2013-10-30
EP2129966A2 (fr) 2009-12-09
KR20090118036A (ko) 2009-11-17
WO2008122707A2 (fr) 2008-10-16
CA2675989A1 (fr) 2008-10-16
RU2009135815A (ru) 2011-04-10
RU2451877C2 (ru) 2012-05-27
FR2913097B1 (fr) 2009-04-24
US9739482B2 (en) 2017-08-22

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