WO2015014477A1 - Procédé permettant de faire fonctionner un système à multiples brûleurs au moyen d'une mesure de pression d'air de combustion et d'une régulation - Google Patents

Procédé permettant de faire fonctionner un système à multiples brûleurs au moyen d'une mesure de pression d'air de combustion et d'une régulation Download PDF

Info

Publication number
WO2015014477A1
WO2015014477A1 PCT/EP2014/002062 EP2014002062W WO2015014477A1 WO 2015014477 A1 WO2015014477 A1 WO 2015014477A1 EP 2014002062 W EP2014002062 W EP 2014002062W WO 2015014477 A1 WO2015014477 A1 WO 2015014477A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
burner
pressure
values
duct
Prior art date
Application number
PCT/EP2014/002062
Other languages
German (de)
English (en)
Inventor
Markus WEBEL
Original Assignee
Ee Emission Engineering Gmbh
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
Application filed by Ee Emission Engineering Gmbh filed Critical Ee Emission Engineering Gmbh
Priority to US14/907,286 priority Critical patent/US20160161117A1/en
Publication of WO2015014477A1 publication Critical patent/WO2015014477A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L3/00—Arrangements of valves or dampers before the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/002—Regulating air supply or draught using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/005—Regulating air supply or draught using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/007—Regulating air supply or draught using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/02—Controlling two or more burners

Definitions

  • the invention relates to a method and an arrangement for operating a multi-burner system for a furnace.
  • a combustion chamber of a furnace of a furnace installation may be associated with a plurality of burners through which air is supplied to the combustion chamber, which is burned in the combustion chamber with a fuel.
  • each burner can be divided into several air channels due to its geometry and / or construction, whereby air is provided via each air duct.
  • a quantity of the supplied air must be metered.
  • the invention relates to a method for operating a multi-burner system comprising a plurality of burner groups each having at least one burner.
  • Each burner group is assigned at least one air supply channel through which the burner group air is supplied.
  • Each burner group has at least one k-th air duct with which the air supplied via the air supply channel is divided into a k-th air or a k-th proportion of the supplied air.
  • a value of an air pressure for the kth air or the kth proportion of the air is measured for every kth air duct of all burner groups.
  • All measured values for the air pressure of the k-th air of each burner group are compared with each other, whereby it is checked whether values of the air pressure for the k-th air of the burner groups differ from each other. Divergent values of the air pressure of the k-th air within the k-th air duct of all burner groups are changed and, if necessary, compensated and / or adjusted.
  • all measured values for the air pressure of the k th air are combined at a typically central location and compared with each other.
  • the multi-burner system for which the process is performed has multiple burner groups, each burner group comprising at least one burner. Each burner group is assigned at least one air supply duct to the at least one burner, via the least a burner of the burner assembly, air is supplied to the ⁇ min.
  • each burner has a k-th air duct, with which the supplied air is divided into the k-th air, wherein for each k-th air duct of all burners, the value of the air pressure for the k-th air is measured, all measured Values for the air pressure of the k-th air of the burners are compared with each other, checking whether values of the air pressure for the k-th air of the burners deviate from each other, and different values of the air pressure of the k-th air are within the k-th Air ducts are changed and compensated.
  • the at least one air supply channel is assigned to at least one of the burner groups and / or one of the burners.
  • Each burner group and / or burner has at least one air duct, namely the kth air duct.
  • a k th air is split off from the air which is supplied through the air supply channel via the at least one air duct, namely the k th air duct and thus the air supplied in at least a kth share, usually several shares, divided.
  • each burner group and / or each burner comprises an air duct connection, via which the k-th air duct is connected to the air supply duct. Due to the geometry of the burner group and / or the burner or the air duct within a housing of the burner group and / or the burner, the supplied air through the respective k-th Air channel divided into a k-th air or its k-th share.
  • all portions of the air supplied to all the burners are controlled and thus controlled and / or regulated, which also includes the measure of comparing the values of the air pressure for the kth air.
  • the air pressure for each k-th air or the k-th proportion of the supplied air d. H. the primary, secondary or tertiary air, compared with each other and adapted as needed.
  • the values for each part of the air and thus for the k-th air are balanced. After such an adjustment or compensation, values of different proportions of the air may nevertheless differ from one another.
  • the proposed pressure measuring device can detect and read the kth air of each burner or burner group and modify it with the aid of air supply modules, with a favorable fuel / air ratio at all burners or each Burner group is adjustable. Due to a burner group and / or burner design, it is possible to divide the air into fractions without requiring multiple air supply channels. With the method, only those portions of the k th air k th air ducts are considered in the rule, which have a common or separate air supply channel.
  • a value or actual value of the air pressure in the k-th air duct for an mth burner, which deviates from a desired value, is changed by changing a cross-sectional area of the kth air duct.
  • This value of the air pressure for the k-th air to be changed within the k-th air duct for one or the m th burner is adjusted by adjusting at least one air supply module within the k th air duct, which may be designed as an air damper, for example. changed and / or balanced.
  • the air pressure of the k-th air in the k-th air duct has an actual value p_act and the cross-sectional area of the k-th air duct has an actual value A_act.
  • a target value A_soll is set, whereby a target value p_soll is set for the air pressure of the k th air in the k th air passage.
  • a relation of a ratio of the intended values of the pressure, ie the setpoint value p_setpoint and the actual value p_act, and a square of a ratio of the intended values of the cross-sectional area, ie the setpoint value A_setpoint and the actual value A_act, is taken into account.
  • p_soll / p_ist is proportional to (A_ist / A_soll) 2 .
  • a ratio of the target value of the pressure to the actual value of the pressure is inversely proportional to a square of the ratio of the actual value to the target value of Cross sectional area.
  • the ratio p_soll / p_act is proportional to (V_soll / V_act) 2 .
  • V is a volumetric flow rate of the air through the air duct.
  • V_setpoint is a setpoint value
  • V_actual is a volumetric flowrate actual value.
  • a burner on the air side is classified as a sort of orifice plate, even if the burner can not have a round cross-section like a measuring orifice, but a cross-section with possibly complex geometry.
  • this cross-sectional constriction is arranged between the air supply module and the interior of the furnace, where the burner block is situated.
  • a background is to achieve a maximum exit velocity for the air at this point in order to mix the air as efficiently as possible with the fuel which is also supplied at this point to an oven or the furnace.
  • the pressure difference between the pressure of the air in the kth air channel and the ambient pressure of the air is measured.
  • the pressure in the k th air duct can be measured with respect to the pressure in the interior of the furnace with a probe or measuring probe arranged therein. Since burners are each relatively adjusted with respect to their air pressure and / or their amount of air, both options are applicable.
  • the air pressure of complete burner groups can be measured.
  • the narrowest cross-section in the region of the burner block is to be selected in an analogous manner, with a cross-section of the metering orifice of several burners being able to be combined to form the burner group.
  • an actual value p_act p_0 prevails for the pressure of the kth component of the air.
  • the arrangement according to the invention has at least one pressure measuring device for measuring the values of the air pressure for the kth air and possibly a control device for comparing and for changing and compensating possibly deviating values of the air pressure within the kth Air ducts on.
  • the adjustment of the air supply modules to compensate for the air pressure can also be done manually.
  • the at least one pressure measuring device is arranged centrally and designed to measure all values of the air pressure for the k-th air of all burner groups and / or burners usually at the same time.
  • the arrangement also comprises a plurality of probes or measuring probes arranged at measuring points and designed to detect the air pressure, along the k-th air duct Burner group and / or a burner at least one such probe is arranged, which is connected to the at least one pressure measuring device, for example. Via an air hose.
  • the control unit is designed to change a cross-sectional area of a k th air duct by controlling an air supply module arranged inside this k th air duct, usually by controlling a position of the air supply module.
  • the inventive method and the arrangement according to the invention allow the adjustment of a uniform distribution of air to be burned by measuring the static pressure of the air at least one point of the multi-burner system and by merging measured values of the static Pressing through the printing machine at a reading point.
  • a static pressure measurement may be performed as a pressure difference measurement between a k-th airway probe and the ambient pressure, or alternatively between the k-th airway probe and the probe in an interior of the furnace.
  • the invention is provided by locally centrally merge the values of the pressure of the k-th air at least one reading point, the static pressure for each k-th proportion of the supplied air for all burner groups and / or burners directly and simultaneously capture or determine and thus read the air volumes indirectly and / or compared to all connected burner groups and / or burners of the multi-burner system. Furthermore, based on this, by adjusting air dampers, wherein each burner group and / or each burner is assigned at least one k-th air duct with one air damper, the same air flows for all burner groups and / or burners, if the fire heat output (FWL) is the same, furthermore, to compare, determine and / or read out effects when adjusting the various louvers centrally.
  • the values to be set for the air pressure of these burners or burner groups must be adjusted accordingly via the quadratic relationship between pressure loss and cross-sectional area or flow in the respective air duct to ensure the correct supply of air to ensure.
  • At least one of the burners of the multi-burner system can be designed as a so-called diffusion burner.
  • a diffusion burner is mixed with the fuel to be burned air (combustion air) only at a then forming flame root and ignited.
  • at least one of the burners may be formed as a premixed or at least partially premixed burner ⁇ , wherein said to be combusted air or at least a part of the to be combusted air is already mixed with the fuel before it reaches the flame root.
  • the air to be burned for the burners usually with the help of one or more blowers, in exceptional cases by means of compressors, for example.
  • a pressure greater than 100 mbar from the environment sucked and led to the individual burners by means of a distribution system comprising pipes and / or ducts as air supply ducts.
  • an air supply channel is usually connected via an air duct connection with the at least one or k-th air duct of a burner.
  • the pressure of the air in the distribution system is usually low, for example. Less than 20 mbar.
  • a fuel gas or liquid fuel which is burned as fuel with the air is usually under a sufficiently high pressure, for.
  • a sufficiently high pressure for.
  • > 1 bar (for gases) and> 4 bar (for liquids) so that the same amount of fuel is available to all burners and thus the fuel is distributed equally to all burners.
  • the burners are designed for the same air-side pressure loss at a given flow of the air and the same position of the air supply modules, d. H. if the flow through all burners was the same, the same static pressure would have to be measured in all burners.
  • the values for the rated thermal input (FWL) of individual burners or burner groups differ.
  • the air side pressure loss should be the same for all burners, ie at maximum burner output, regardless of their size, the same pressure loss should prevail.
  • a first burner of the multi-burner system with a maximum heat input of 1 MW has a pressure drop ⁇ of 10 mbar on the air side
  • a second burner of the multi-burner system with a maximum combustion heat output of 2.5 MW should also have a pressure drop ⁇ of 10 mbar. If this is the case, based on a measurement of the static pressure of the k-th air for each of the burners Flow of air to be burned derived at each burner and thus determined.
  • values for the pressure must be corrected taking into account a quadratic dependence of a value for a flow of air and a value for the pressure loss.
  • the flow can be dependent on a cross-sectional area of the k-th air channel. The same procedure is to be used if identical burners with different FWL are used.
  • a burner comprises at least one air duct in which one or more air supply modules are arranged for adjusting and / or redistributing the air within the burner.
  • the at least one air channel is connected to the air supply channel and / or flows into it.
  • Such an air supply module is installed in the k-th air duct of the burner and adapted to change a cross-sectional area of the air duct through which air can flow into the burner, thereby usually at least partially open, wherein the air duct with the air supply module u , a. either completely or partially opened or completely closed.
  • Such air supply module is usually used as a damper or, depending on the design of the burner, for. B. as a self-rotatable adjusting register formed.
  • a burner with an air channel or primary air channel in the air channel has an air supply module, for example a first air supply module designed as a primary air flap.
  • a burner with two air channels and thus, with a primary and secondary air supply has two air supply modules, namely a primary and a secondary air damper. If a burner has three air ducts, ie a primary, secondary and tertiary air duct, this comprises three air supply modules designed as air dampers, which can be referred to as primary, secondary and tertiary air dampers.
  • Single measurements of the pressure are carried out simultaneously when the method is carried out on all burners in order to know the air distribution conditions at a specific time, since the operating conditions of a furnace installation can change rapidly and frequently.
  • the proposed method offers plant personnel the opportunity to work directly on site, eg. B. in the immediate vicinity of the furnace to measure and display the air distribution to the burners or burner groups. Either then be detected by the control unit, a DC or unequal distribution of air and initiated appropriate changes to the air supply modules, or the plant staff reads the air distribution visually and makes even manually changes the air supply modules.
  • the quasi-instantaneous effect of such changes allows the control unit or the plant personnel to set a uniform distribution of air very quickly without much effort.
  • Figure 1 shows a schematic representation of an embodiment of a burner with primary air supply (Figure lb) and an embodiment of a burner with primary air and secondary air supply ( Figure la).
  • Figure 2 shows a schematic representation of a first embodiment of a multi-burner system in different operating situations when carrying out a first embodiment of the method according to the invention.
  • FIG. 3 shows a schematic representation of a second embodiment of a multi-burner system in different operating situations when carrying out a second embodiment of the method according to the invention.
  • Figure 4 shows a schematic representation of a third embodiment of a multi-burner system when carrying out a third embodiment of the method according to the invention.
  • FIG. 5 shows a schematic representation of a fourth embodiment of a multi-burner system, which has at least two multi-burner systems presented with reference to FIG. 4, when carrying out a fourth embodiment of the method according to the invention.
  • the figures are described in a coherent and comprehensive manner, like reference numerals designate like components.
  • Figure la shows a schematic representation of a first embodiment of a burner 2 with an air supply channel 8 and two air channels 4, 6, the inlet openings are both connected to an opening of the common air supply channel 8.
  • An outlet opening of the first air channel 4 is coaxially enclosed here by an outlet opening of the second air channel 6.
  • the outlet opening of the second air channel 6 is bounded and / or enclosed by a burner block or a burner block holder 10.
  • Both air channels 4, 6 open into a combustion chamber 12 of a furnace.
  • a first, formed as a louver air supply module 14 is arranged behind the input opening.
  • a second, likewise designed as a damper air supply module 16 is arranged behind the input opening.
  • This first embodiment of the burner 2 has a primary and a secondary air supply.
  • air or combustion air to be combusted is conveyed via the connected air supply channel 8 to the two air ducts 4, 6, which are symbolized here by checkered arrows as well as in the following figures.
  • first air which is referred to as primary air and is symbolized here and in the following figures by a first, dense hatching from bottom left to top right.
  • second air channel 6 is and / or flows second air, which is referred to as secondary air and is symbolized here and in the following figures by a second hatching from top left to bottom right.
  • Second air duct 6. The outer walls of both air ducts 4, 6 border here on a housing of the burner 2 and are identical to the housing of the burner 2.
  • a schematically illustrated in Figure lb second embodiment of a burner 36 has only a simple air supply with a first air passage 38, in which behind an input opening, a first, designed as an air damper air supply module 40 is arranged.
  • a probe 42 for measuring the static pressure of the air in this air channel 38 is also arranged on the outer wall.
  • the air supply channels 3, 8 may be due to differential pressure losses, airfoils, fittings, etc. within an air distribution system 84 and air ducts 4, 6, 38, 80, 82, it can be seen that individual burner groups 72, 72a, 72b and / or burners 2, 22, 24, 26, 28, 30, 36, 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b partly very different amounts of air be encouraged.
  • the static pressure is via probes 18, 20, 42, 79, here on the housing of the respective burner 2, 22, 24, 26, 28, 30, 36, 74, 74 a, 74 b, 76, 76 a, 76 b, 78, 78 a , 78b are arranged, measured.
  • the air pressure across the probes 79 is measured, albeit the pressure of the distribution box of the respective burner group 72, 72a, 72b.
  • the static pressure can be detected and / or measured within an air channel 4, 6, 38, 80, 82, but also at other locations.
  • such a measuring probe or probe 18, 20, 42, 79 can also be arranged at any other point in the air duct 4, 6, 38, 80, 82, provided that the corresponding static pressure in the air duct 4, 6, 38, 80, 82 each representative amount of air flowing is measurable.
  • static pressure is in an embodiment of the method for each burner 2, 22, 24, 26, 28, 30, 36, 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b, a Value for the flow of indirectly through the burner 2, 22, 24, 26, 28, 30, 36, 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b each flowing and to be burned air determined.
  • values of the pressure of the second air (secondary air) are determined by second air ducts 6, 82 of all burners 2, 22, 24, 26, 28, 30, 36, 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b of the multi-burner system 32, 34, 44, 46 compared.
  • a multi-burner system 32, 34, 44, 46 includes a number of multiple burners 2, 22, 24, 26, 28, 30,. 36, 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b, each burner 2, 22, 24, 26, 28, 30, 36, 74, 74a, 74b, 76, 76a, 76b, 78 , 78a, 78b in turn has a plurality of air ducts 4, 6, 38, 80, 82 which, for example, are connected to the air supply duct 3, 8, 84, 98 via a distributor box in a burner group 72, 72a, 72b.
  • values for the static pressure in the k-th air ducts 4, 6, 38, 80, 82 can be compared with each other well and distributions of the individual values, ie equal distributions and / or non-uniform distributions, can be easily detected and from this values for the Flow rate of the air through all k-th air channels 4, 6, 38, 80, 82 divert.
  • values of the static pressure and thus the flow rate differ from one another, these values are established by adjusting the air supply modules 14, 15, 16, 17, 40 in the k-th air ducts 4, 6, 38, 80, 82 to each other and / or or adjusted to the respective rated thermal input.
  • FIG 2 shows a schematic representation of a first burner 22, a second burner 24 and an x-th burner 26 of a total of n burners 22, 24, 26 of a first embodiment of a multi-burner system 32, similar to the burner 2 of Figure la, each one the first air duct 4 having a first air supply module 14 arranged therein as an air flap and a second air duct 6 having a second air supply module 16 arranged therein and designed as an air flap.
  • this multi-burner system 32 includes a common, primary air supply channel 3 for all burners 22, 24, 26.
  • This common air supply channel 3 is in more secondary air supply channels 8 branches, each of these secondary air supply channels 8 with the two air channels 4, 6 of each burner 22, 24, 26 is connected. Air conveyed via the primary air supply passage 3 and / or the secondary air supply passages 8 is supplied from each first air passage 4 and from each second air passage 6 a burner 22, 24, 26 divided into a second air (secondary air).
  • values for a first, static air pressure or primary air pressure in the respective first air duct 4 are measured here via first probes 18, which are respectively arranged on walls of the first air ducts 4 of all burners 22, 24, 26.
  • values for a second, static air pressure or secondary air pressure in the respective second air duct 6 are measured via second probes 20, which are respectively arranged on walls of the second air ducts 6 of all the burners 22, 24, 26.
  • the values for the static air pressure prevailing therein should also be measured, in the case of third air ducts of the burners 22, 24, 26 would be values for a third one To measure static air pressure or tertiary air pressure within the third air channels of all the burners 22, 24, 26.
  • Results of the measurements carried out simultaneously for values of the air pressure in the two different air ducts 4, 6 of all burners 22, 24, 26 are measured centrally at the same time by a pressure measuring device 49 for all air ducts 4, 6 of all burners 22, 24, 26 simultaneously / or recorded as well as in the diagram 50 "pressure measurement / manometer primary (white) and secondary air (black)" automatically displayed.
  • 50 values for the static pressure are plotted or read along an ordinate of the diagram.
  • the display of the measured values at the pressure measuring device 49 can be carried out as described, but it is also conceivable to display the pure measured values without plotting along an ordinate.
  • This central pressure measuring device 49 is also equipped with a Control unit 51 for controlling, ie for controlling and / or regulating functions of individual components of the multi-burner system 32 connected. If the air supply modules 14, 16 are not automated, no controller is used and the respective air supply modules 14, 16 manually or manually adjusted.
  • FIG. 2 a shows a first operating situation of the multi-burner system 32, in which it is provided that cross-sectional areas of all the air ducts 4, 6 of all the burners 22, 24, 26 are maximized, ie. H. are 100% open.
  • all rotatable, designed as louvers air supply modules 4, 6 are placed within the air ducts 4, 6 parallel to a flow direction and thus oriented, so that they set the air flowing opposite a lowest possible flow resistance.
  • the value of the first air pressure in the first air channel 4 of the first burner 22 is 40 pressure units, usually mm water column, (bar 52).
  • the value of the first air pressure in the first air duct 4 of the second burner 24 is 42 pressure units (bar 54).
  • the value of the first air pressure in the first air duct 4 is 51 pressure units (bar 56).
  • the value of the second air pressure in the second air duct 6 of the first burner 22 is 36 pressure units (bar 58), the value of the second air pressure is second air duct 6 of the second burner 24 45 pressure units (bar 60) and the value of the second air pressure in the second air duct 6 of the x-th burner 26 47 pressure units (bar 62).
  • the diagram 50 from FIG. 2a shows that within the first air channel 4 of the xth burner 26, the highest actual value for the first air pressure is below all other detected actual values of the first air pressure in the first air ducts 4 of all the other burners 22, 24 of the multi-burner system 32 prevails. Furthermore, within the second air duct 6 of the xth burner 26, the highest actual value for the second air pressure prevails below all other detected values of the second air pressure in the second air ducts 4 of all the other burners 22, 24 of the multi-burner system 32. This means that the Through the air supply channels 3, 8 supplied total air and also the amount and / or the proportion of the first and second air in the burner 26 must be higher than in the second burner 24 and this in turn greater than the amount in the first burner 22.
  • differences or differences between the actual values of the k-th air pressure in a k-th air duct 4, 6 of the burner 22, 24, 26 and a provided target value of the k-th air pressure in the k-th air ducts 4, 6 determined and compared with the central pressure measuring device 49.
  • the air supply modules 4, 6 are controlled by the control unit 51 or by manual adjustment and thus the cross-sectional areas within the air ducts 4, 6 are changed. It is provided in the embodiment described here, all values for the pressure of the first portion of the air to z. B. 50 pressure units and all values for the pressure of the second portion of the air to z. B. 45 pressure units to regulate and / or adjust and thus compensate.
  • the cross-sectional area in the first air duct 4 of the x-th burner 26 is adjusted by adjusting the first air supply module 14 arranged therein via the control unit 51 or alternatively manually to 70% and thereby reduced by 30%.
  • the cross-sectional area is adjusted to 80% by adjusting the first air supply module 14 disposed therein, reducing the cross-sectional area by 20%. This also results in a change in the actual value of the pressure of the first air of 40 pressure units to the target value of 50 pressure units, since usually the total amount of air to all burners 22, 24, 26, for example. From a control device for the Oven and / or the burner 26, is kept constant.
  • the cross-sectional area by adjusting the therein arranged second air supply module 16, which is controlled by the controller 51 or manually, is set by reduction by 40% to 60%.
  • the cross-sectional area of the second air supply opening 6 in the second burner 24 is adjusted by controlled adjustment of the therein arranged second air supply module 16 with the controller 51 or manually with reduction of 10% to 90%. This also results in a change in the actual value of the pressure of the second portion of the air in the first burner from 36 pressure units to 45 pressure units.
  • the maximum value is not necessarily critical. In an embodiment, it can be provided that a burner is operated with a higher FWL and then also requires more air. In this case, you would be compared to the others Burners with low FWL higher air pressures necessary. It may also be necessary to favor the first air over the second air, then the air pressure in the first air may become higher than the second air. If all the burners 22, 24, 26 are identical in construction and all fire the same FWL, ie the amount of air should be the same at all burners 22, 24, 26, then, as shown in Table 64, the second burner 24 has to be used and especially the x-th burner 26 are adjusted. By throttling the louvers in the x th burner 26, air is transferred to the other burners 22, 24.
  • the total amount of air that is conveyed by a fan is usually kept constant during this adjustment process of the louvers by means of an automatic control loop from the process control system of the multi-burner system 32, whereby an unequal distribution of air to all burners 22, 24th , 26 is eliminated.
  • the second operating situation shown schematically with reference to FIG. 2b results for the burners 22, 24, 26 of the multi-burner system 32.
  • the table 64 displayed via the control unit 51 indicates, as described above, inter alia, by what percentage the cross-sectional areas in the air ducts 4, 6 of the individual Burner 22, 24, 26 are now open, alternatively, the degree of opening are read using a flap position in a manual adjustment.
  • the bars 152, 154, 156, 158, 160, 162 in the diagram 150 now indicate that in the first air channels 4 all the burners 22, 24, 26 now have the same first air pressure with a value of 50 pressure units.
  • the values of the second air pressure in the second air ducts 6 of the burners are now 45 pressure units each.
  • a pressure in the combustion chamber which is connected to the burners 22, 24, 26, and takes into account a pressure of the ambient air, wherein there is usually a negative pressure in the combustion chamber.
  • the values of the air pressure of the first and second air in the first and second burners 22, 24 are compensated, cf. Bar 252, 254, 256, 258, 260, 262 in the diagram 250.
  • the air pressure of the first air in the first air passage 4 of the first burner 22 corresponds to the air pressure of the first air in the first air passage 4 of the second burner 24 (bar 254) and the air pressure of the second air in the second air passage 6 of the first burner 22 (bar 258) the air pressure of the second air in the second air passage 6 of the second burner 24 (bar 260).
  • FIG. 3 shows a schematic representation of a second embodiment of a multi-burner system 34 with two burners 28, 30, each having two air channels 4, 6 and as well as the presented in the preceding figures la, 2a and 2b burner 12, 22, 24, 26 with an air supply channel 8 are connected.
  • FIG. 3 further shows a measuring arrangement 70 for controlling an operation of the multi-burner system 34 as well as at least one step of the presented embodiment of the method. Besides that is Here, too, arranged on each combustion chamber, a probe or measuring probe 13 for detecting the air pressure.
  • Figure 3a shows schematically, a first probe 18 on an outer wall of the first air passage 4 of the first burner 28 via a first z. B. formed as an air hose connection with a first leg of a trained as a U-tube pressure gauge first pressure measuring device 66.
  • a first probe 18 on an outer wall of the first air channel 4 of the second burner 30 is connected via a second z. B. formed as an air hose connection with a second leg of the trained as a U-tube pressure gauge first pressure measuring device 66.
  • a level of liquid in the U-tube manometer indicates that the first air pressure in the first air passage 4 of the first burner 28 is greater than the first air pressure in the first air passage 4 of the second burner 30.
  • a second probe 20 on an outer wall of the second air channel 6 of the first burner 28 is connected via a third z. B. formed as an air hose connection to a first leg of a trained as a U-tube manometer second pressure measuring device 68 is connected.
  • a second probe 20 on an outer wall of the first air channel 4 of the second burner 30 is connected via a fourth formed as an air hose connection to a second leg of the formed as a U-tube manometer second pressure measuring device 68.
  • a level of the liquid in the U-tube pressure gauge indicates here that the second air pressure in the second air duct 6 of the first burner 28 is greater than the second air pressure in the second air duct 6 of the second burner 30.
  • cross-sectional areas in the air channels 4, 6 of the first burner 28 by adjusting the arranged therein air supply modules 14, 16 and thus reduces values for each prevailing therein air pressure or reduced, up to the first air channels 4 of both burners 28, 30 the same first air pressure and in the second air ducts 6 of both burners 28, 30 of the same second air pressure What is indicated in FIG. 3b by the levels of the liquid in the two pressure measuring devices 66, 68 designed as a U-tube manometer.
  • the probes 18, 20 are connected for detecting the values for the air pressure to a leg of the U-tube manometer.
  • any other pressure measuring device 66, 68 may be used to detect and / or compare the values of the pressure.
  • a fourth embodiment of a multi-burner system 44 is shown schematically in FIG. 4 and here in FIG. 4 comprises a burner group 72 with a distributor box, which is also referred to as a plenum. If a multi-burner system has multiple distribution boxes, each burner group 72 is arranged in each case in a distribution box.
  • FIG. 5 shows a total of two such burner groups 72a, 72b with distribution boxes, which form a further embodiment of a multi-burner system 46.
  • burner groups 72a, 72b there may be any number of burner groups 72a, 72b.
  • a plurality of burners 74, 74 a, 74 b, 76, 76 a, 76 b, 78, 78 a, 78 b are arranged, of which in Figures 4 and 5, a first burner 74, 74 a ,. 74b, a second burner 76, 76a, 76b and a y-th burner 78, 78a, 78b is shown.
  • Each of these burners 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b here comprises a first burner-internal air supply channel 80 and a second burner-internal air supply channel 82.
  • a combustion chamber 12 of a furnace first air or supply primary air whereas the combustion chamber 12 is to be supplied with second air or secondary air via a second burner-internal air supply duct 82.
  • At least one air supply channel 3 is arranged on an outer wall of the distributor box of a burner group 72, 72a, 72b, via which air is to be provided to the distributor boxes of the burner group 72, 72a, 72b.
  • This at least one air supply channel 3 is connected to a cross-burner and / or distributor box internal air supply channel 84.
  • the burner-internal air channels 80, 82 are in turn connected to the parent cross-burner and / or distributor box internal air supply channel 84, which is usually identical to the distribution box.
  • the over the at least one air supply channel 3 and thus the parent cross burner and / or distributor box internal air supply channel 84 funded air is burner specific and thus for each burner 74, 74 a , 74b, 76, 76a, 76b, 78, 78a, 78b above the burners
  • Air channels 80, 82 divided into their proportions, ie the first air within the respective first air channel 80 and the second air within the respective second air channel 82.
  • the air supplied from the at least one air supply channel 3 to the burner-spanning and / or distribution box-internal air supply channel 84 is freely distributed.
  • the interior of the distributor box 72, 72a, 72b of the burner group 72, 72a, 72b formed by the burner-spanning and / or distribution box-internal air supply channel 84 and the burners 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b provides for the supply the air to all burners 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b.
  • At least one measuring probe 79 is arranged along the burner-spanning and / or distribution box-internal air supply channel 84 or at the distribution box of the burner group 72, 72a, 72b, via which the air pressure is measured. Since in this method only the values of the air pressure within a distributor box of the burner group 72, 72a, 72b are measured, only the air volumes of an entire distributor box of the burner group 72, 72a, 72b are comparable to another distributor box of another burner group 72, 72a, 72b , This approach may be helpful since with this arrangement or type of construction of the air supply modules 15, 17, the measurement of the air pressures in the burner-internal air ducts 80, 82 may be difficult.
  • each of these burner groups 72a, 72b here comprises a distributor box with a total of y burners 74a, 74b, 76a, 76b, 78a, 78b each having a first and a second burner-internal air supply channel 80, 82.
  • the air passes via the burner-spanning and / or distribution box-internal air supply channel 84 by a free distribution to the y burners 74a, 74b, 76a, 76b, 78a, 78b.
  • air to be combusted is supplied from a reservoir and / or via a blower 96 via a line system 98, along which valves and / or flaps or air supply modules 100 are disposed, to a plurality of air supply channels 3 of the burner groups 72a, 72b. This provided air is divided into the distribution boxes of the burner groups 72a, 7-2b.
  • At least one air supply channel 3 of the first burner group 72a at least one, here several measuring probes 79 are arranged at different measuring points, which are connected to a first node 102 for all measuring probes 79.
  • the air pressure for the distribution box 74a is detected.
  • a value of the air pressure is determined by a central pressure measuring device 104 and optionally represented directly by the pressure measuring device 104 as a diagram 106 with a first, here white bar.
  • a plurality of measuring probes 79 are arranged at measuring points along at least one air supply channel 3 of the x-th burner group 72b, which are connected to an x-th node 108 for all measuring probes 79 are connected.
  • the air pressure for the x-th burner group 72b and thus for the distribution box is detected.
  • a value of the air pressure for the burners 74b, 76b, 78b of the x-th burner group 72b is also determined and from the central pressure measurement device 104 illustrated by means' of a second, here black bar in the graph 106th
  • This central pressure measuring device 104 cooperates with a controller 110 to control the multi-burner system 46 and the method.
  • the multi-burner system 46 can be operated manually and thus without control unit 110.
  • cross-sectional areas of the air ducts are changed by adjusting the air supply modules 100, taking into account the proportionality p_set / p_act (A_act / A_setpoint) 2 or p_setpoint / p_act (V_set / Vactual) 2 .
  • the total air volumes are compared to each distribution box with each other. As a rule, no separate distribution boxes for the first and the second air are provided. A distribution box provides the first and second air alike.
  • Air volumes to individual burners 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b or K-th air ducts are then no longer distinguishable.
  • a position of the k-th air supply modules 15 is then the same for all burners 74, 74a, 74b, 76, 76a, 76b, 78, 78a, 78b of the same distribution box.
  • the value of the air pressure in the first burner group 72a is less than the value of the air pressure in the x-th burner group 72b. If all the burners 74a, 74b, 76a, 76b, 78a, 78b of all burner groups 72a, 72b are now operated with the same FWL, so that they again need equal amounts of air, to compensate for the x different values of the air pressure of the air by controlled adjustment at least an air supply module 100, which is arranged along the at least one air supply channel 3 to the first burner group 72 a, the air increased by opening the air supply module 100 until both distribution box specific values are equal. Alternatively, the air supply module 108 of the second burner group 72b can be closed further.
  • the air pressures are to be adapted according to the quadratic relationship between pressure or pressure loss and cross-sectional area of the air duct 80, 82, as already described for FIG.
  • the principle presented with reference to FIGS. 2 and 3 is basically also applicable to groups of burners 74, 74a, 76, 76a, 78, 78a within burner groups 72, 72a, 72b where individual measurements are taken at each of the burners 74, 74a, 76, 76a , 78, 78a are feasible.
  • the presented method for measuring the air distribution is also applicable to ovens with Naturzugbrennern without combustion air ducts.
  • values of the pressure in a combustion chamber 12 are compared with one another by parallel measurement at different measuring probes 13 of the combustion chamber 12 by direct simultaneous reading.

Abstract

L'invention concerne un procédé permettant de faire fonctionner un système à multiples brûleurs (32), lequel comprend plusieurs groupes de brûleurs, à chaque groupe de brûleurs étant associé au moins un canal d'amenée d'air (3, 8) par l'intermédiaire duquel l'air est amené au groupe de brûleurs. Chaque groupe de brûleurs comprend au moins un kième canal d'air (4, 6) permettant de diviser l'air amené en un kième air, une valeur d'une pression d'air pour le kième air étant mesurée pour chaque kième canal d'air (4, 6) de tous les groupes de brûleurs. Toutes les valeurs mesurées pour la pression d'air du kième air sont comparées les unes aux autres, et il est vérifié si des valeurs de la pression d'air pour le kième air des groupes de brûleurs sont différentes les unes des autres, des valeurs différentes les unes des autres de la pression d'air du kième air étant modifiées à l'intérieur du kième canal d'air (4, 6).
PCT/EP2014/002062 2013-08-01 2014-07-28 Procédé permettant de faire fonctionner un système à multiples brûleurs au moyen d'une mesure de pression d'air de combustion et d'une régulation WO2015014477A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/907,286 US20160161117A1 (en) 2013-08-01 2014-07-28 Method for operating a multi-burner system by means of combustion air pressure measurement and regulation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013012943.5 2013-08-01
DE102013012943.5A DE102013012943B4 (de) 2013-08-01 2013-08-01 Verfahren zum Betreiben eines Mehrbrennersystems

Publications (1)

Publication Number Publication Date
WO2015014477A1 true WO2015014477A1 (fr) 2015-02-05

Family

ID=51535400

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/002062 WO2015014477A1 (fr) 2013-08-01 2014-07-28 Procédé permettant de faire fonctionner un système à multiples brûleurs au moyen d'une mesure de pression d'air de combustion et d'une régulation

Country Status (3)

Country Link
US (1) US20160161117A1 (fr)
DE (1) DE102013012943B4 (fr)
WO (1) WO2015014477A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10448313B2 (en) * 2017-04-11 2019-10-15 Google Llc Identifying users via mobile hotspots
ES2894624T3 (es) * 2018-12-21 2022-02-15 Air Liquide Conjunto y procedimiento para la inyección de un agente de combustión gaseoso

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5685707A (en) * 1996-01-16 1997-11-11 North American Manufacturing Company Integrated burner assembly
US20120291679A1 (en) * 2009-11-30 2012-11-22 Five Stein Method for correcting the combustion settings of a set of combustion chambers and apparatus implementing the method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH358537A (de) 1959-12-23 1961-11-30 Sulzer Ag Verfahren und Einrichtung zum Betrieb einer mit mindestens zwei verschiedenen Brennstoffarten befeuerbaren feuerungsanlage
GB9506365D0 (en) 1995-03-28 1995-05-17 British Steel Plc Process control,method and apparatus
GB0224625D0 (en) * 2002-10-23 2002-12-04 Honeywell Normalair Garrett Method of balancing the supply of bleed air from a plurality of engines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5685707A (en) * 1996-01-16 1997-11-11 North American Manufacturing Company Integrated burner assembly
US20120291679A1 (en) * 2009-11-30 2012-11-22 Five Stein Method for correcting the combustion settings of a set of combustion chambers and apparatus implementing the method

Also Published As

Publication number Publication date
DE102013012943A1 (de) 2015-02-26
US20160161117A1 (en) 2016-06-09
DE102013012943B4 (de) 2018-03-22

Similar Documents

Publication Publication Date Title
DE2832708C2 (fr)
EP1085267B1 (fr) Régulation des mesures primaires pour la réduction des oxydes d'azote dans des turbines à gaz
EP1621811A1 (fr) Procédé de fonctionnement pour un dispositif de combustion
DE2306537A1 (de) Verminderung der bildung von no tief x bei der verbrennung von brennstoffen
EP1840465A2 (fr) Système comportant des brûleurs à injection de carburant étagée
DE102008030650A1 (de) Einrichtung und Verfahren zur Steuerung des Brennstoff-Luft-Verhältnisses bei der Verbrennung gemahlener Kohle in einer Kohlekraftwerksfeuerungsanlage
EP0969192B1 (fr) Méthode pour égaliser la distribution de carburant dans une turbine à gaz avec plusieurs brûleurs
DE102014019766A1 (de) Infrarotstrahler
DE102014019765A1 (de) Dunkelstrahler
DE102013012943B4 (de) Verfahren zum Betreiben eines Mehrbrennersystems
EP2556303B1 (fr) Ensemble pneumatique avec équilibre de masse
EP1649218B1 (fr) Procede de reduction des emissions de nox d'un systeme de bruleurs comprenant plusieurs bruleurs et systeme de bruleurs permettant de mettre en oeuvre ce procede
DE102009029118A1 (de) Strahlheizvorrichtung
DD283862A5 (de) Verfahren und system der automatischen optimalisierung der verbrennungsprozesse in thermischen objekten
DE102019002848A1 (de) Steuerungsvorrichtung einer anlage, anlage, steuerungsverfahren einer anlage und steuerungsprogramm einer anlage
DE914728C (de) Verfahren zur Beheizung von Koksoefen mit Starkgasen schwankenden Heizwertes
DE102012019409A1 (de) Vorrichtung zum Erzeugen von Wärme aus zumindest einem Energieträgermedium unter Hinzufügen von Luft
DE4303700A1 (de) Vorrichtung zur Regelung des Gas-Luft-Verhältnisses bei einem Gasbrenner
EP1930657B1 (fr) Commande de l'air d'alimentation d'une combustion de biomasse
DE19816714A1 (de) Gebläsebrenner
DE3811293A1 (de) Brennkammer einer gasturbine
DE102020121597A1 (de) Verfahren und Anordnung zur pneumatischen Gemischbildung bei einem Vormischbrenner
DE102011117325A1 (de) Erhöhung des Heizwertbereichs von Brennstoffen sowie des Bereichs zwischen Minimal- und Maximallast in Wirbelschichtfeuerungen
CH653366A5 (de) Anordnung zur steuerung eines innerhalb eines raumes umgewaelzten mediumstroms.
WO2015036081A1 (fr) Dispositif de brûlage de substances gazeuses

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14761947

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 14907286

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14761947

Country of ref document: EP

Kind code of ref document: A1