WO2004085924A1 - Vorrichtung zur temperaturregelung/-begrenzung für eine wärmeerzeugungsanlage - Google Patents
Vorrichtung zur temperaturregelung/-begrenzung für eine wärmeerzeugungsanlage Download PDFInfo
- Publication number
- WO2004085924A1 WO2004085924A1 PCT/EP2004/002834 EP2004002834W WO2004085924A1 WO 2004085924 A1 WO2004085924 A1 WO 2004085924A1 EP 2004002834 W EP2004002834 W EP 2004002834W WO 2004085924 A1 WO2004085924 A1 WO 2004085924A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- burner control
- sensor
- burner
- controller
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/02—Multiplex transmission
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/04—Memory
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/08—Microprocessor; Microcomputer
Definitions
- the invention relates to a device for temperature control / limitation for a heat generation system and a method for checking the function, in particular the temperature control / limitation function for a heat generation system.
- a safety temperature monitor STW
- STB safety temperature limiter
- the STB or STW mentioned at the outset are preferably used to monitor the boiler temperature of a boiler.
- the boiler temperature is recorded by at least one temperature sensor, which can be arranged, for example, on the boiler control panel of the boiler together with the temperature controller.
- the temperature controller compares the detected temperature of the boiler with a specified setpoint and influences the actual value of the temperature in the sense of an adjustment to its setpoint. If, for example, the temperature limit monitored by the temperature limiter or monitor is reached or an error occurs, e.g. sensor breakage, sensor short circuit, component failure or power failure, the system should be switched off.
- the shutdown of the system triggered by the response of the STB or STW generally causes an interruption in the energy supply.
- the control circuit or load circuit of an automatic burner control is usually interrupted, which then shuts off the fuel supply.
- the burner control unit controls the start-up sequence of the burner with preliminary ventilation, ignition and flame monitoring.
- the burner control locks, ie it cuts off the fuel supply.
- the burner control must meet special safety regulations. Representative of this, reference is made, for example, to the DIN EN 298 standard.
- the use of the standardized interface also has the disadvantage that if, for example, a 230 volt signal transmitted from the burner control to the boiler control panel, which is to be further processed by the controller, has to be additionally converted into a corresponding protective extra-low voltage signal, since the controller in is generally operated with protective extra-low voltage.
- the safety temperature limiter, temperature controller and automatic burner control are designed separately.
- Components such as relays or microprocessors are used for the burner control and the safety temperature limiter, which perform the same or similar tasks.
- the invention is therefore based on the object of proposing a device, in particular for use in a heating system, which, while avoiding the disadvantages of the prior art mentioned, enables reliable and accurate temperature control / limitation with little outlay on equipment, without neglecting safety-related aspects.
- the object of the invention is to propose a method which enables a reliable and precise check of the function, in particular of a temperature control / limitation function, in particular for a heating system.
- the device according to the invention or the method according to the invention can be used for all functions relevant to safety in connection with the monitoring of thermal processes, which ensure that the system is put into an operationally safe state when a malfunction or a fault occurs.
- the device according to the invention is characterized in that the safety temperature limiter or temperature monitor (STB, STW) is distributed with respect to the functionality to the automatic burner control unit and controller.
- the components of the STB or STW, which are subject to the requirements of enhanced security, are preferably provided in the automatic firing unit.
- the components that are not subject to the special requirements of enhanced safety are preferably provided in the controller. For example, the temperature comparison of the perceived actual temperature of the boiler with the maximum permissible safety temperature TSTB at which the STB or STW trips is assigned to the burner control.
- the sensor for recording the actual boiler temperature is preferably assigned to the controller.
- the recorded actual temperature is transmitted from the controller to the automatic firing unit via a communication interface.
- the communication interface can be implemented, for example, as a data bus (electrical / optical optical waveguide) or as a radio link.
- the burner control monitors the boiler temperature and switches off the fuel valves of the burner, for example, when the set safety temperature T S TB is exceeded, as a result of which the fuel supply is interrupted.
- the inventive distribution of the functionality of the STB or STW to the controller and automatic burner control means that the previously conventional mechanical STB / STW as an independent device which detects, evaluates and monitors the boiler temperature and, if necessary, cuts off the fuel supply, can be dispensed with.
- the components required for the safety shutdown and preferably also the components required for the locking need only be provided once.
- the outlay on equipment can be significantly reduced.
- the integration of the safety-relevant functions of the STB or STW in the burner control also has the advantage that the existing safety structures of the burner control can be used synergistically in an optimal manner.
- a complete integration of STB or STW in the burner control is also possible. However, this would have the disadvantage that, in this case, the temperature sensors would have to be connected to the automatic firing equipment, as a result of which the standardized automatic firing equipment would be burdened with additional connections for the temperature sensors.
- the burner control unit preferably transmits a corresponding test request signal to a sensor / test value switchover module, as a result of which it is possible to switch over between the sensor resistor and a corresponding reference resistor.
- the sensor / test values are preferably transmitted at different times from one another.
- the requirements for interference immunity in communication must be observed.
- a data bus is preferably used, which enables a CRC check to determine data transmission errors. No special security measures are required through the use of the data telegrams according to the invention.
- a data bus that meets the safety-related aspects can be used for data transmission, as described, for example, in document EP 0751 350 A2.
- the safety function according to the invention for unlocking which, for example, max. 5 unlocks are allowed within a certain time, the locking can be released by an unlock command transmitted via the data bus.
- the unlock command can be generated by a device that is not safety-related, for example by means of a portable device by the operator.
- filtering for the received data can also be provided for the burner control. This can, for example, prevent the burner from being switched on / off unintentionally, for example. Since the controller according to the invention does not have to be designed in a safety-relevant manner in accordance with the standard mentioned at the outset, no special safety measures are necessary for the controller.
- the sensors, the controller and the communication interface are checked according to the invention by the burner control.
- a galvanic isolation is recommended, which corresponds to the requirements for protective extra-low voltage, since the controller is usually operated with protective extra-low voltage in contrast to the automatic firing system.
- Galvanic isolation in the form of optocouplers can be provided for the controller or the automatic firing device.
- the invention also has the advantage that further process signals between the automatic burner control and the controller, for example the type of fuel, etc. can be exchanged via the communication interface. Further advantages of the invention result from the following description.
- Figure 1 shows schematically the arrangement according to the invention with an electronic safety temperature limiter in connection with a controller and automatic burner control.
- FIG. 2 shows in a functional block diagram the preferred implementation of the invention, for example using the temperature control / limitation function.
- FIG. 1 shows the interaction of the automatic burner control unit (FA) and controller with a safety temperature limiter (STB) distributed over the controller and FA.
- a safety temperature monitor STW
- the sensor Tk is used, for example, to record the temperature of a boiler (not shown here) and is connected to the controller.
- the controller's analog / digital converter converts the analog measured value into a digital value, for example into a temperature value T. This is transferred from the controller to the burner control.
- the burner control includes a safety module.
- the safety module or STB module monitors, for example, the perceived boiler temperature T and switches off the burner (not shown here) when the reference value (safety temperature TSTB) stored in the STB module is exceeded.
- the safety temperature or tripping temperature TSTB can be set, for example, by an installer using an operating device (not shown) when the system is started up.
- the safety temperature T S TB is transmitted to the automatic firing system and stored, for example, in a safety-relevant manner in the STB module.
- the safety temperature TSTB is preferably transmitted to the automatic firing system in the same format as the actual boiler temperature T.
- the STB module carries out a corresponding test to check the correct functioning of the measured value acquisition, the controller and the communication interface.
- the sensor and the path from the sensor connection terminal including further processing in the controller, e.g. Analog / digital conversion and also the transmission of the converted measured value checked by the burner control.
- it is checked whether the measured value T lies within the permissible range defined by TSTB.
- Figure 2 shows a preferred embodiment of the implementation of the
- the controller 20 and the automatic burner control 40 are connected to one another via a communication interface (30) as shown here.
- a communication interface (30) as shown here.
- a data bus electrical / optical
- a wireless radio connection can be used as the communication interface between the controller and the burner control.
- a sensor value / test value switchover module 10 is preferably controlled by the automatic firing device by means of a test request signal.
- the temperature sensor resistors 11 and 12 are used, for example, to record the actual temperature of a boiler (not shown here).
- the reference resistors 13 and 14 are connected in parallel to them via the switches 15 and 16.
- the elements 11 to 16 assigned to the sensor value / test value switching module 10 can be present in the controller 20 in part or in full, depending on the functionality.
- the correct mounting of the temperature sensors or a short circuit or a sensor break can be recognized by comparing the temperature sensor resistances or the sensor values.
- This redundant design of the temperature sensors is therefore a sensible safety measure. Age-related drifting of the sensor values can also be compared with the corresponding ones
- Reference resistances or reference values are determined. Instead of two separate single sensors, a double sensor or just one temperature sensor can of course also be provided. In this case, only a reference resistor needs to be provided. It must be ensured that a reliable and safe sensor placement and function of the sensor is guaranteed. Of course, this also applies to the reference sensor or reference resistor.
- the sensor / test values T1 'and T2' or T ⁇ est and T Test 2 ' are fed, for example, from a multiplexer 21 to an analog-to-digital converter 22.
- the test values can also be used to detect errors in multiplexing or in analog-to-digital conversion.
- the converted temperature values T1 'and T2' as well as the converted test values T ⁇ est i 'and T ⁇ es t2' are, for example, in hexadecimal form and are supplied to a shift register 23.
- the sensor and test values temporarily stored in register 23 are then preferably fed to a linearization module 24, which has software for linearizing the characteristic curve, for example.
- the probe / test values for example in hexadecimal form in register 23, can be converted into a form suitable for evaluation, for example, integer values.
- the sensor / test values T1, T2, T Te st ⁇ and ⁇ es t 2 obtained by the linearization are supplied to a shift register 25, for example.
- the shift registers preferably have a ring structure. Because the last value at the
- a test request signal e.g. transmit a test control sequence, for example every 10 seconds asynchronously from a test request unit (42) of the automatic firing unit to the sensor value / test value switchover module (10).
- the test request unit 42 can of course also be contained in the security module 41.
- the sensor resistors are then switched to the reference resistors.
- the firing automat then evaluates the response signal received within a defined time interval in order to check the function with regard to errors or faults that have occurred in the system.
- the asynchrony between sensor / test values can also be evaluated by the burner control.
- the answer to the test request can also be identified by a special attribute. This can make it easier for the burner control to evaluate the answer.
- a current time specification can be used as an attribute for identifying the response to the test request.
- a random value generated by the controller and checked by the burner control could also be used.
- the sensor / test values are preferably transmitted, for example, in accordance with a protocol, for example in the form of a data telegram.
- a protocol for example in the form of a data telegram.
- a corresponding send buffer 26 can be provided.
- one of the four data telegrams Pi to P 4 is provided for transmission to the automatic firing system.
- the telegrams Pi and P 2 are each preferably transmitted periodically, for example every 5 seconds, automatically to the automatic firing device by the controller.
- the telegram P1 includes, for example, the sensor values T1, T2 and the test value T Test ⁇ .
- the telegram P 2 includes, for example, the test value T Tes t2 and the sensor values T1 and the sensor value T2.
- the telegrams P3, P4 can each be transmitted, for example in response to the test request, preferably asynchronously to the telegrams Pi or P2.
- the telegram P3 comprises, for example, the two test values T ⁇ est ⁇ , T ⁇ est2 and the sensor value T1.
- the telegram P 4 includes, for example, the sensor value T2 and the two test values T ⁇ e st ⁇ , T ⁇ est2.
- the burner control (40) or the safety module (41) can then check the data telegrams Pi, P 2 , P 3 or P 4 received
- the burner control first tests the correct sequence of telegrams P 1 to P 4 . For example, a restart of the burner is prevented if the correct test sequence is not found.
- test functions shown in the function block diagram are described below. Of course, a different order than the one shown here can also be used for the test functions.
- the first test function includes checking the two temperature values T1 and T2, which are compared for this purpose with the tripping temperature of the safety temperature limiter TSTB.
- T S TB is reached or exceeded, a fault message is generated and the burner is switched off by the burner control. It is also locked if there is a switch-on command from the controller to the burner controls.
- the sensor values T1 and T2 are each compared with a maximum permissible temperature difference T d i ff . If this temperature difference is exceeded permanently, for example, the burner control locks the burner and generates a corresponding error message. If the temperature difference is exceeded briefly or once, only a safety shutdown can take place. However, if the permissible temperature difference is exceeded again or several times within a certain time, the burner control locks the burner.
- the third test function includes a comparison of, for example, the
- the burner control switches the burner off and an error message is generated. If there is no response to the test request, e.g. there is a failure of the reference resistor or the controller or a communication fault. In this case e.g. after a time delay the locking of the test request.
- the fourth function includes, for example, an overtemperature counter to determine whether the safety temperature T S TB is subsequently exceeded when the burner is switched off due to a reheating effect. If this is the case, a corresponding counter is incremented. If, for example, the counter reading ZA US has reached a predetermined value ZSTB, the device is locked.
- an overtemperature counter to determine whether the safety temperature T S TB is subsequently exceeded when the burner is switched off due to a reheating effect. If this is the case, a corresponding counter is incremented. If, for example, the counter reading ZA US has reached a predetermined value ZSTB, the device is locked.
- the burner control or the STB module locks the burner after a lockout, this can be unlocked with an unlock command.
- the unlock command can also be generated by an operating device that is not designed for safety.
- the unlocking function is described below. If there is a fault in the automatic burner control with interlock, which was sent as a fault message from the automatic burner control to the data bus and is displayed on the control unit, the operator can select a menu on the control unit for unlocking, for example. The unlocking command is then given by the operator to the data bus via the operating device. The unlocking is then carried out. In order to avoid incorrect operation, the unlocking function is preferably carried out using the handshake method. For example, that Control unit that triggered the unlock command wait a certain time to determine whether the unlock was successful. If there is no information that the unlock was successful, a new attempt to unlock can only be allowed after a time delay, for example.
- unlocking e.g. three unlocking classes can be distinguished.
- the first class concerns e.g. internal faults of the automatic firing unit, which can only be reset after unlocking has been unlocked.
- the lock can be released by unlocking the boiler control panel using a separate data line.
- Locking and unlocking can be made known to the operator by means of a corresponding display.
- the second class concerns e.g. Fault in the heating system in which the STB function triggered. Locking can be carried out by the operator using an unlocking command sent via the data bus, e.g. reset only once.
- the third class relates to other application errors that can be reset, for example, using an operator panel. This is preferably a
- Security function used, e.g. A maximum of 5 releases are allowed within a defined time.
- the safety function is only effective when unlocked via the data bus.
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- 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)
- Control Of Temperature (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04721538A EP1606555A1 (de) | 2003-03-24 | 2004-03-18 | Vorrichtung zur temperaturregelung/-begrenzung für eine wärmeerzeugungsanlage |
US10/550,281 US20070175624A1 (en) | 2003-03-24 | 2004-03-18 | Device for temperature regulation/limitation in a heat generating installation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03006570A EP1462724B1 (de) | 2003-03-24 | 2003-03-24 | Vorrichtung zur Temperaturregelung/-begrenzung für eine Wärmeerzeugungsanlage |
EP03006570.0 | 2003-03-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004085924A1 true WO2004085924A1 (de) | 2004-10-07 |
Family
ID=32798881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/002834 WO2004085924A1 (de) | 2003-03-24 | 2004-03-18 | Vorrichtung zur temperaturregelung/-begrenzung für eine wärmeerzeugungsanlage |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070175624A1 (de) |
EP (2) | EP1462724B1 (de) |
AT (1) | ATE376150T1 (de) |
DE (1) | DE50308404D1 (de) |
WO (1) | WO2004085924A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10215405A1 (de) * | 2002-04-08 | 2003-10-16 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Funktionsprüfung eines Analog-Digital-Wandlers sowie Analog-Digital-Wandler |
DE102007037299B4 (de) * | 2007-08-07 | 2013-10-24 | Continental Automotive Gmbh | Verfahren zum Überprüfen einer Messvorrichtung und Messvorrichtung eines Sicherheitssystems in einem Fahrzeug |
ITPD20130186A1 (it) * | 2013-07-02 | 2015-01-03 | Sit La Precisa S P A Con Socio Uni Co | Metodo di controllo del funzionamento di un bruciatore |
US11549684B2 (en) * | 2018-08-27 | 2023-01-10 | Honeywell International Inc. | Burner system control |
CN113111507B (zh) * | 2021-04-08 | 2023-05-30 | 西安热工研究院有限公司 | 一种锅炉严重超温后蒸汽系统材质安全性评估的方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3248034A1 (de) * | 1982-12-24 | 1984-07-05 | Hewlett-Packard GmbH, 7030 Böblingen | Schaltungsanordnung zur temperaturmessung |
EP0326245A2 (de) * | 1988-01-21 | 1989-08-02 | Honeywell Inc. | Brennstoffbrenner Kontrollverfahren |
EP0614047A1 (de) * | 1993-03-05 | 1994-09-07 | Landis & Gyr Technology Innovation AG | Elektronische Steuer-und Regeleinrichtung für Gasbrenner von Heizungsanlagen |
DE19956426C1 (de) * | 1999-11-24 | 2001-05-03 | Honeywell Bv | Vorrichtung zur Überwachung der Wassertemperatur |
DE10114823A1 (de) * | 2001-03-26 | 2002-10-10 | Siemens Building Tech Ag | Verfahren und Vorrichtung zur Überwachung von Brennern |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US822323A (en) * | 1904-10-01 | 1906-06-05 | Gen Electric | Thermostatic control. |
US1735268A (en) * | 1923-02-08 | 1929-11-12 | M W Barber | Thermostat |
US1963771A (en) * | 1930-10-01 | 1934-06-19 | Arthur H Ballard Inc | Burner control |
US2550507A (en) * | 1946-05-31 | 1951-04-24 | Gen Electric | Condition responsive, timing, and sequencing circuit control |
US2966940A (en) * | 1958-01-10 | 1961-01-03 | Electronics Corp America | Fuel burner programming apparatus |
US3744954A (en) * | 1971-05-27 | 1973-07-10 | E Faulkner | Fuel-leak detector and safety system |
US3880353A (en) * | 1973-11-01 | 1975-04-29 | Robertshaw Controls Co | Heating system and safety valve |
US3948439A (en) * | 1974-12-04 | 1976-04-06 | A. O. Smith Corporation | Sediment buildup warning device for water heaters |
US4280184A (en) * | 1979-06-26 | 1981-07-21 | Electronic Corporation Of America | Burner flame detection |
US4467178A (en) * | 1982-03-26 | 1984-08-21 | Swindle Elro M | Control system for regulating water heater operation in accordance with anticipated demand |
US4535931A (en) * | 1983-09-14 | 1985-08-20 | Kenneth W. Scott | Energy conserving water heater control system |
US4599992A (en) * | 1985-08-30 | 1986-07-15 | Harding John W | Anticipatory thermostat with reset for domestic hydronic boiler control |
US5619430A (en) * | 1995-10-10 | 1997-04-08 | Microchip Technology Inc. | Microcontroller with on-chip linear temperature sensor |
CA2371848A1 (en) * | 2002-02-14 | 2003-08-14 | Claude Lesage | Explosion proof gas water heater |
GB0408102D0 (en) * | 2004-04-08 | 2004-05-12 | Autoflame Eng Ltd | Total dissolved solids |
US7647895B2 (en) * | 2005-02-07 | 2010-01-19 | Emerson Electric Co. | Systems and methods for controlling a water heater |
-
2003
- 2003-03-24 DE DE50308404T patent/DE50308404D1/de not_active Expired - Lifetime
- 2003-03-24 EP EP03006570A patent/EP1462724B1/de not_active Expired - Lifetime
- 2003-03-24 AT AT03006570T patent/ATE376150T1/de not_active IP Right Cessation
-
2004
- 2004-03-18 WO PCT/EP2004/002834 patent/WO2004085924A1/de active Application Filing
- 2004-03-18 EP EP04721538A patent/EP1606555A1/de not_active Withdrawn
- 2004-03-18 US US10/550,281 patent/US20070175624A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3248034A1 (de) * | 1982-12-24 | 1984-07-05 | Hewlett-Packard GmbH, 7030 Böblingen | Schaltungsanordnung zur temperaturmessung |
EP0326245A2 (de) * | 1988-01-21 | 1989-08-02 | Honeywell Inc. | Brennstoffbrenner Kontrollverfahren |
EP0614047A1 (de) * | 1993-03-05 | 1994-09-07 | Landis & Gyr Technology Innovation AG | Elektronische Steuer-und Regeleinrichtung für Gasbrenner von Heizungsanlagen |
DE19956426C1 (de) * | 1999-11-24 | 2001-05-03 | Honeywell Bv | Vorrichtung zur Überwachung der Wassertemperatur |
DE10114823A1 (de) * | 2001-03-26 | 2002-10-10 | Siemens Building Tech Ag | Verfahren und Vorrichtung zur Überwachung von Brennern |
Also Published As
Publication number | Publication date |
---|---|
EP1462724A1 (de) | 2004-09-29 |
ATE376150T1 (de) | 2007-11-15 |
EP1462724B1 (de) | 2007-10-17 |
EP1606555A1 (de) | 2005-12-21 |
DE50308404D1 (de) | 2007-11-29 |
US20070175624A1 (en) | 2007-08-02 |
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