Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N5/00—Systems for controlling combustion
  • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
  • F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
• • 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
  • F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C7/00—Stoves or ranges heated by electric energy
  • F24C7/08—Arrangement or mounting of control or safety devices
  • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
• • 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
  • F23N2227/00—Ignition or checking
  • F23N2227/20—Calibrating devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2237/00—Controlling
  • F23N2237/10—High or low fire

Definitions

• the invention relates to an arrangement for monitoring a furnace according to the preamble of claim 1 and a method for monitoring a furnace and for operating this arrangement according to the preamble of claim 2.
• Generic combustion systems and heaters consist essentially of a burned with solid, liquid or gaseous fuels burner, an air and / or exhaust fan, a control device for controlling and monitoring the combustion.
• separate sensors are known for the combustion control, which serve on the one hand to detect the oxygen content in the exhaust gas and on the other hand to detect the exhaust gas mass flow.
• the oxygen content in the exhaust gas and the combustion air mass flow which corresponds to the exhaust gas mass flow, are important for the combustion control. In particular, this ensures the quality of combustion as well as low emissions.
• the performance of heating appliances is monitored and regulated.
• these conventional sensors are each provided with electric heaters to perform a measurement can.
• the function of the sensor for detecting the exhaust gas mass flow corresponds to that of a hot wire anemometer, as known from the prior art.
• a heating wire is exposed to the flow of a gaseous medium and then electronically monitors the resistance and / or voltage change on the heating wire.
• a proportionately larger heating power requires the proper operation of a sensor for the oxygen content in the exhaust gas.
• Both the mass flow sensor and the oxygen sensor have hitherto been operated separately and largely independently of one another.
• an oxygen sensor for engine exhaust from the DE 103 12 240 B4 which comprises a sensor heater with monitoring of the heating current.
• a control system for a heater for an oxygen sensor known. This includes a passive module for controlling a heater, which generates a signal to control a heater at a first duty cycle and measures a resistance of the heater for an oxygen sensor, an exhaust gas temperature assignment module that assigns the resistance to an exhaust gas temperature, and an active module for controlling a heater that provides a signal to control a heater generated at a second duty cycle based on the exhaust gas temperature.
• the invention has for its object to optimize the operation of a furnace, in particular a heater, in view of a good quality of combustion and low power consumption.
• the arrangement for monitoring a furnace is characterized in that a single unit is provided as a sensor for detecting the oxygen content in the exhaust gas and for detecting the exhaust gas mass flow, which has a single heater for both functions.
• the method for monitoring a furnace and for operating the arrangement described above is characterized in that the heater is switchable to a standby mode with a lower heating power, in which only the exhaust gas mass flow is detected. This may be sufficient, for example, in standby and also in certain operating phases of the heater.
• the heating device switches to the normal operating state, which also permits detection of the oxygen content in the exhaust gas, with a higher heating power.
• sufficient time remains until the required temperature is reached at the sensor.
• the pre-venting time of the fan can be used for the corresponding high heating of the sensor, because in this phase of operation, the detection of the oxygen content is not yet operationally necessary. Nevertheless, it is generally switched as quickly as possible to the detection of the oxygen content in the exhaust gas and recorded parallel to the air flow. This is very important because usually for an electronically controlled gas-air mixture first sufficient airflow is achieved must become. Before the gas valve may be opened, the detection of this air flow can take place with the combination sensor according to the invention.
• the heating device can be switched in a further embodiment in the normal, also detecting the oxygen content in the exhaust gas enabling operating state, if by one of the control device in the standby mode, the connection was determined by authoritative for burner operation components.
• the fan belongs to these components.
• the heating device is switched to a standby operating state as soon as these burner components are switched off, and / or as soon as they fall below predefinable threshold values.
• These thresholds include, for example, a predetermined fan speed.
• a calibration of the firing plant and / or the burner can be realized more reliably than hitherto.
• the exhaust gas mass flow and the purge time are evaluated with fresh air, in particular to promote residues of exhaust gas and possibly polluted air from the firing system out.
• a calibration is then carried out to the maximum oxygen content in the air.
• the safe and good quality combustion is ensured at each operating point, although on the other hand power for the heater in the standby mode is saved.
• the standby losses are reduced, but nevertheless the sensor or the function for detecting the oxygen content in the exhaust gas is available again relatively quickly.
• only a single sensor is needed. This also means only one installation position and only one fastener on or in the exhaust path.
• only one, preferably multi-core electrical connection line between control device and sensor is sufficient.
• a component with two functions, such as the sensor according to the invention continues to bring advantages already in production and assembly as well as in the spare parts stocking.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
• Regulation And Control Of Combustion (AREA)

Applications Claiming Priority (1)

Publications (2)

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ID=41212815

Family Applications (1)

Country Status (2)

Cited By (1)

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Citations (5)

Family Cites Families (3)

• 2008
  • 2008-09-13 DE DE102008047037A patent/DE102008047037B3/de not_active Expired - Fee Related
• 2009
  • 2009-08-27 EP EP09168825.9A patent/EP2163821A3/fr not_active Withdrawn

Patent Citations (5)

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