EP2638323A1 - Dispositif de réglage - Google Patents

Dispositif de réglage

Info

Publication number
EP2638323A1
EP2638323A1 EP11779445.3A EP11779445A EP2638323A1 EP 2638323 A1 EP2638323 A1 EP 2638323A1 EP 11779445 A EP11779445 A EP 11779445A EP 2638323 A1 EP2638323 A1 EP 2638323A1
Authority
EP
European Patent Office
Prior art keywords
fuel gas
combustion air
valve
control device
combustion
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.)
Withdrawn
Application number
EP11779445.3A
Other languages
German (de)
English (en)
Inventor
Sergio Varo Oliveira Loureiro Salustio
Thomas Prestle
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2638323A1 publication Critical patent/EP2638323A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/02—Regulating draught by direct pressure operation of single valves or dampers
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/185—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves

Definitions

  • the invention relates to a control device for a fuel gas and combustion air supply to a burner with modulated heat output of a heater for heating a heat transfer fluid and a method for their operation according to the preambles of claims 1 and 1 1st
  • Such heating devices on which the invention is based are used, for example, for producing hot water or heating water (space heating).
  • the heat transfer fluid can be heated in a large-volume storage tank according to the principle of the DHW cylinder or in a small-volume heat exchanger based on the principle of a continuous flow heater.
  • the heater further comprises a fan for conveying the combustion air, a fuel gas valve for metering the amount of fuel gas, a mixing chamber for forming a combustion gas combustion air mixture and a burner for igniting and combustion of the mixture with ignition and flame monitoring.
  • a fan for conveying the combustion air
  • a fuel gas valve for metering the amount of fuel gas
  • a mixing chamber for forming a combustion gas combustion air mixture
  • a burner for igniting and combustion of the mixture with ignition and flame monitoring.
  • the heater comprises a control device for controlled activation of the heater components such as the blower and the means for igniting the mixture and monitoring the flame or a heat carrier idle temperature.
  • the burner depending on the heat demand can deliver a variable, ie modulated heat output, have a combustion air blower with the possibility of speed variation.
  • a burner with low heat requirement eg small DHW tap and / or low domestic hot water temperature
  • the blower thus runs at a low speed.
  • the burner gives off a high level of heat mower from this, a large amount of combustion air must be promoted.
  • the blower runs at a high speed.
  • the fuel gas quantity is metered as a function of the quantity of combustion air delivered by the variable-speed blower, or in other words the fuel gas pressure is adjusted in accordance with the combustion air pressure provided by the variable-speed blower so that a mixture having the desired composition is established when the fuel gas and combustion air are mixed.
  • This type of fuel gas metering is called pneumatic gas-air-composite, for which pneumatically controlled gas valves are used.
  • a differential pressure which is proportional to the amount of combustion air at a throttle point in the combustion air path, is applied to a fuel gas valve, which then releases a certain amount of fuel gas in proportion to the differential pressure.
  • the fuel gas valve attempts to equalize the differential pressure and thereby doses a quantity of combustion gas assigned to the amount of combustion air.
  • both the orifice and the location of merging fuel gas and combustion air are upstream of the blower.
  • the assignment of fuel gas quantity and combustion air quantity results from an air requirement L of the fuel gas used, which in turn is calculated from the minimum air requirement L M IN increased by a specific factor A S OLL (nominal air ratio).
  • N is the amount of combustion air that at least requires the fuel gas for complete (stoichiometric) combustion.
  • a S OLL 1, 2 a certain excess air is set (target composition of the mixture).
  • the actual air ratio of a combustion can already be determined in the unburned mixture (eg gas analysis), but also in the flame (eg ionization flow) or in the exhaust gas (eg measurement of the proportions of carbon dioxide or residual oxygen).
  • a disadvantage of this prior art is the need for an expensive variable-speed blower with integrated control electronics, which is required to set a desired air volume or nominal fan speed corresponding to the heat demand. Furthermore, the location of the merging of fuel gas and combustion air often results in the need for a gas-tight and therefore more expensive blower because the fuel gas-air mixture is conveyed through the blower.
  • the fuel gas combustion air ratio is determined by the mode of action and adjustment of the pneumatically controlled gas valve and not adjustable or correctable during operation, but this would, for example, in a start phase of the burner for Improvement of the ignition conditions partly desirable (for example, enrichment of the mixture with fuel gas at burner start).
  • the gas valves at low fuel gas flow rates or Brenngasdrü- bridges often stabilization difficulties, they do not meter to constant fuel gas, but begin to pulsate and meter fluctuating fuel gas quantities, which has a negative effect on the combustion (for example, decreasing flame stability with contrasting from the burner surface or burning flames on them, overheating of the burner surface, increased pollutant emissions).
  • the invention has for its object to provide a control device for a fuel gas and combustion air supply to a burner of a heater and a method for their operation that overcome these disadvantages, in particular to cost and control technology easy to control components and still the ability to offer power modulating and air variable burner operation.
  • Single-stage blowers are simple and cost-effective blowers that can only be switched on and off.
  • the heat requirement can be given, for example, by the presence and size of a heat carrier fluid flow through the heater and / or by an undershooting of a desired heat carrier fluid temperature at a heat carrier fluid outlet (outlet).
  • the presence and size of the heat demand determine the amount of fuel gas.
  • the single-stage fan is switched on and / or off and / or the fuel gas valve is precontrolled, so that the metered amount of fuel gas is approximately sufficient to service the heat demand.
  • the flow sensor can be embodied, for example, as a turbine arranged in the heat carrier fluid path, the rotational speed of which is dependent on the flow rate being detected by means of a reed contact.
  • the fine control of the heat transfer fluid temperature to a predefinable target temperature is based on signals of a temperature sensor for determining a heat transfer fluid temperature, based on which the degree of opening of the fuel gas valve is controlled, which adjusts the metered amount of fuel gas and the released heat output of the burner.
  • the temperature sensor is arranged in the heat carrier fluid path downstream of the heat exchanger and measures the temperature of the heated heat transfer fluid.
  • the combustion air valve is a diaphragm-controlled valve, wherein a flexible membrane arranged in a membrane housing comprising two membrane chambers is under the influence of pressure in the chambers.
  • a first diaphragm chamber is connected to the fuel gas path, a second diaphragm chamber is connected to the combustion air path.
  • the membrane moves under pressure and causes an adjustment of the combustion air valve.
  • a suitable embodiment is characterized in that the first diaphragm chamber with a low pressure side of the fuel gas valve, ie with the downstream valve exhaust c
  • Another suitable embodiment is characterized in that the first membrane chamber with a low pressure side of the fuel gas valve, ie with the downstream valve outlet, and the second diaphragm chamber with a high pressure side of the fan, ie with the downstream fan outlet (pressure side) are connected.
  • the airway is an easy-to-flow airway in which the combustion air valve and the fan are arranged in series.
  • the airway comprises a main air path with a fan arranged therein and a sub-air path arranged parallel thereto with a combustion air valve arranged therein.
  • the secondary air path serves to return a combustion air partial quantity from a high-pressure side (pressure side) to a low-pressure side (suction side) of the blower.
  • control device is characterized in that the membrane is biased by means of at least one spring.
  • the membrane can also be biased by two springs from both sides.
  • the size of the bias voltage can be adjusted by, for example, a support surface of the spring is adjusted.
  • a particularly suitable embodiment is characterized in that an actuator is provided for adjusting the prestressing of the membrane.
  • This actuator can be adjusted in dependence on signals which represent a combustion and / or a composition of a combustion gas combustion air mixture and / or a composition of a combustion exhaust gas.
  • an actuator for example, electrically, electromagnetically, hydraulically or pneumatically adjustable actuators can be used.
  • the inventive method for operating a control device for a fuel gas and combustion air supply to a burner with modulated heat output of a heater for heating a heat transfer fluid comprises the steps
  • An embodiment of the method is characterized in that when exceeding a heat carrier fluid quantity representing a signal of a flow sensor for determining a heat transfer fluid flow, the fan is turned on and a burner operation are released.
  • This switch-on quantity (for example a drinking water minimum flow rate) ensures that the burner only goes into operation if the resulting heat is safely dissipated, ie the heat transfer fluid or the heater does not overheat even if the minimum possible heat output is provided.
  • the blower is switched off and the burner switches off.
  • the opening degree of the fuel gas valve is piloted on the basis of a signal of the flow sensor, on the basis of a signal representing the amount of the flow.
  • the fine adjustment of the temperature of the heat transfer fluid to a predefinable setpoint temperature is based on signals from a temperature sensor for determining the heat carrier fluid temperature, with the aid of which the degree of opening of the fuel gas valve is regulated.
  • the outlet temperature of the heat transfer fluid from the heat exchanger is used for this purpose, and for storage water heaters a storage water temperature.
  • An embodiment of the method is characterized in that a decreasing combustion air pressure prevailing on the low-pressure side (downstream) of the fuel gas valve, the increasing combustion gas pressure and a decreasing combustion air pressure prevailing on the low-pressure side (upstream, suction side) of the fan and downstream of the combustion air valve act on the membrane-controlled combustion air valve in the sense of an increasing valve opening.
  • Another embodiment is characterized in that a decreasing combustion air pressure prevailing on the low-pressure side (downstream) of the fuel gas valve, the increasing combustion gas pressure and a decreasing combustion air pressure prevailing on the high-pressure side (downstream, pressure side) of the fan act on the membrane-controlled combustion air valve in the sense of an increasing valve opening.
  • a particularly suitable embodiment of the method comprises the further steps Generating signals representing a combustion and / or a composition of a fuel gas combustion air mixture and / or a composition of a combustion exhaust gas, and
  • control device With the control device according to the invention, a system is provided which allows a simple fuel gas combustion air mixture formation with a simple and accurate control of the mixture components. For this purpose, compared to the prior art comparatively simple and inexpensive components are required, which favor influencing the mixture composition.
  • Fig. 1 is a schematically illustrated control device for a fuel gas
  • Fig. 2 compact embodiment of a diaphragm-controlled combustion air valve of a control device for a fuel gas and combustion air supply to a burner.
  • FIG. 1 shows a control device according to the invention, shown schematically, of a heating device with an inlet 1 and an outlet 2 for a heat transfer fluid, which is heated in a heat exchanger 3, a fuel gas inlet 4 and a combustion air inlet 5, a mixing chamber 6 to form a fuel gas Combustion air mixture and a burner 7 for ignition and combustion of the mixture (heat generation, flames 71).
  • a flow sensor 8 detects the presence and size of a heat transfer fluid flow
  • a temperature sensor 9 detects the temperature of the exiting warm heat transfer fluid.
  • a heat request is detected by a controller 10 based on the signals of the two sensors 8 and 9.
  • a switch-on threshold eg switch-on amount of heat transfer fluid
  • the control unit 10 sends signals to a blower motor 1 1 for switching on (driving) a single-stage combustion air blower 12 and to an actuator 13 (here stepping motor) for opening a fuel gas valve 14.
  • a switch-on threshold eg switch-on amount of heat transfer fluid
  • the control unit 10 sends signals to a blower motor 1 1 for switching on (driving) a single-stage combustion air blower 12 and to an actuator 13 (here stepping motor) for opening a fuel gas valve 14.
  • Fuel gas flows into the mixing chamber 6 and increases the pressure in the fuel gas path downstream of the fuel gas valve 14.
  • This Fuel gas pressure passes through a pressure line 15 to a first diaphragm chamber 16 of a diaphragm-controlled combustion air valve 17. Under the influence of this fuel gas pressure deforms a diaphragm 18 and causes an opening movement (opening force) of the combustion air valve 17, so that the combustion air blower 12 promote
  • the in the airway downstream of the combustion air blower 17 forming air pressure goes via a pressure line 19 to a second diaphragm chamber 20 of the combustion air valve 17 and supports a closing movement (closing force) of the diaphragm 18 and air valve 17.
  • the membrane and caused by springs 21, 22 membrane bias results in the adjustment of the diaphragm position and thus the degree of opening of the combustion air valve 17.
  • the design of the components involved results in a proportionate dosage of air and fuel gas quantity.
  • the combustion air flows into the mixing chamber 6 and mixes there with the fuel gas.
  • the forming fuel gas-combustion air mixture continues to flow to the burner 7, is ignited and burns with evolution of heat.
  • the exhaust gas leaves the heater via the flue outlet 23.
  • a quantitative ratio of fuel gas to combustion air must be roughly determined by the correct design of pressures, cross sections (eg of the membrane), spring constants, etc. constructive. Fine adjustment, adaptation (eg to changing types of gas or operating points) and / or correction (eg in case of aging or increased pressure drops in the fuel gas or air due to contamination) is possible by changing the bias of the diaphragm 18 by diaphragm spring 21 by the Bias of the spring 21 is varied over its more or less severe compression. This compression can be done manually or, as shown in Figure 1, by means of a motor driven by the controller 10 actuator 24.
  • Fig. 2 shows a compact embodiment of the diaphragm-controlled combustion air valve 17 of a control device according to the invention, which is flanged with its connection cross section 26 directly to the combustion air blower (not shown here).
  • the fuel gas pressure released by the fuel gas valve (not shown) acts on the diaphragm 18 in the first diaphragm chamber 16 via the pressure line 15.
  • the diaphragm 18 deforms under the influence of this fuel gas pressure and causes an opening movement (opening force) of the valve disk 171 of FIG Combustion air valve 17, so that the combustion air blower air (combustion air inlet 5).
  • the air pressure downstream of the valve disc 171 which is open to a certain extent (higher than when the combustion air valve is closed) passes via the pressure line 19 to the second diaphragm chamber 20 of the combustion air valve and supports a closing movement (closing force) of the diaphragm 18 and valve disc 171.
  • Spring 21 is primarily used to adjust an offset of the fuel gas combustion air ratio ( Parallel shift of the ratio describing characteristic).
  • the spring 21 is manually adjustable in the illustrated embodiment, but would also be adjustable by motor as described above (actuator 24) and could then serve a fuel gas combustion air ratio control or air ratio control.
  • Spring 22 must be harder than spring 21 in order to withstand the pressure difference between the first and second diaphragm chamber, ie between higher fuel gas pressure (overpressure to the atmosphere, for example 2 to 8 mbar) and lower air pressure (for example 0 to -3 mbar).
  • a further membrane 27 serves to seal the two air pressure chambers before and after the throttle cross section provided by the valve plate 171.
  • a spring 28 serves to Sichanlegen the assembly valve plate 171 / membrane 27 in the axial direction of the membrane 18, which can not be firmly connected together for assembly reasons.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

L'invention concerne un dispositif de réglage conçu pour une alimentation en gaz de combustion et en air de combustion pour un brûleur d'un appareil de chauffe présentant une puissance calorifique modulable pour chauffer un fluide caloporteur, ainsi qu'un procédé de fonctionnement correspondant. L'objectif de cette invention est de créer un dispositif de réglage qui est constitué en particulier de composants peu onéreux et faciles à contrôler en termes de technique de régulation et qui offre néanmoins la possibilité de faire fonctionner le brûleur en modulant la puissance et en réglant le coefficient d'air. A cet effet, le dispositif de réglage selon l'invention est caractérisé en ce qu'une quantité de gaz de combustion est commandée ou réglée au moyen d'un robinet de gaz de combustion disposé sur la trajectoire du gaz de combustion, en fonction d'une demande de chaleur, et en ce qu'une quantité d'air de combustion déplacée par une soufflante à un étage est réglée au moyen d'un robinet d'air de combustion disposé sur la trajectoire d'air de combustion, en fonction de la quantité de gaz de combustion amenée, un signal d'un capteur destiné à déterminer cette quantité de gaz de combustion influant sur un degré d'ouverture du robinet d'air de combustion.
EP11779445.3A 2010-11-11 2011-11-09 Dispositif de réglage Withdrawn EP2638323A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010051122A DE102010051122A1 (de) 2010-11-11 2010-11-11 Regeleinrichtung
PCT/EP2011/069708 WO2012062787A1 (fr) 2010-11-11 2011-11-09 Dispositif de réglage

Publications (1)

Publication Number Publication Date
EP2638323A1 true EP2638323A1 (fr) 2013-09-18

Family

ID=44910241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11779445.3A Withdrawn EP2638323A1 (fr) 2010-11-11 2011-11-09 Dispositif de réglage

Country Status (3)

Country Link
EP (1) EP2638323A1 (fr)
DE (1) DE102010051122A1 (fr)
WO (1) WO2012062787A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11155904B2 (en) 2019-07-11 2021-10-26 L.E. Jones Company Cobalt-rich wear resistant alloy and method of making and use thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2868970B1 (fr) * 2013-10-29 2020-04-22 Honeywell Technologies Sarl Dispositif de régulation
DE102015223943B4 (de) * 2015-12-01 2022-12-22 Festo Se & Co. Kg Druckregelvorrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827849A (en) * 1971-12-20 1974-08-06 Honeywell Inc Combustion control apparatus
FR2515314A1 (fr) * 1981-10-23 1983-04-29 Seccacier Procede et installation pour reguler le fonctionnement d'une chaudiere a gaz
EP0644377B1 (fr) * 1993-09-16 1996-10-23 Honeywell B.V. Dispositif de commande pour brûleur à gaz
ITRE20010030A1 (it) * 2001-03-29 2002-09-29 Sacmi Forni Spa Dispositivo di regolazione del rapporto di combustione della miscela combustibile di alimentazione dei bruciatori dei forni a gas preposti a
DE20114065U1 (de) * 2001-08-25 2003-01-16 Viessmann Werke GmbH & Co., 35108 Allendorf Modulierender Gasbrenner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012062787A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11155904B2 (en) 2019-07-11 2021-10-26 L.E. Jones Company Cobalt-rich wear resistant alloy and method of making and use thereof

Also Published As

Publication number Publication date
DE102010051122A1 (de) 2012-05-16
WO2012062787A1 (fr) 2012-05-18

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