EP0708299B1 - Procédé de mise en sécurité de chauffe-bains et chaudières atmosphériques à gaz lors du refoulement des produits de combustion - Google Patents
Procédé de mise en sécurité de chauffe-bains et chaudières atmosphériques à gaz lors du refoulement des produits de combustion Download PDFInfo
- Publication number
- EP0708299B1 EP0708299B1 EP95402311A EP95402311A EP0708299B1 EP 0708299 B1 EP0708299 B1 EP 0708299B1 EP 95402311 A EP95402311 A EP 95402311A EP 95402311 A EP95402311 A EP 95402311A EP 0708299 B1 EP0708299 B1 EP 0708299B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- sensor
- threshold
- burner
- return
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims 2
- 239000007789 gas Substances 0.000 title abstract description 6
- 239000000567 combustion gas Substances 0.000 title 1
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims description 15
- 239000000779 smoke Substances 0.000 claims description 7
- 238000012886 linear function Methods 0.000 claims description 2
- 239000003517 fume Substances 0.000 abstract description 5
- 230000006870 function Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000013475 authorization Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000005399 mechanical ventilation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
- F24H9/2042—Preventing or detecting the return of combustion gases
- F24H9/205—Closing the energy supply
-
- 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
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/235—Temperature of exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/36—Control of heat-generating means in heaters of burners
Definitions
- the invention relates to bath heaters and atmospheric gas boilers and more specifically a method for securing the device during discharge of combustion products, for example during blockage of the smoke exhaust duct.
- the fixed trigger value of the heat-sensitive element is a disadvantage, because the lower temperature of the products combustion, when the burner operates at low flow, will not quickly reach this value, and will delay the lockout of the device.
- this device with a sensor of temperature presents untimely disjunctions because the sensor reaches normal operation at large power, a temperature equivalent to that corresponding abnormal operation at low power.
- Another solution is to use two temperature sensors, one placed in the normal flow of the other placed in the discharge flow of these fumes, see for example DE-A-3 020 228.
- the thermal draft When the thermal draft is insufficient, the smoke is forced back into the living room by the appliance draft hood.
- the two sensors temperature are therefore in the same flow of fumes driven back and consequently, the temperature differential between both fall rapidly to a few degrees. This variation of the temperature differential is used to secure the device.
- the temperature of the sensor placed in the discharge flow will only decrease much more slowly since it continues to be subjected to the radiation of draft hood. Therefore the differential of temperature drops as quickly as if there are a repression.
- the device must is equipped with intelligent electronics that take into account account for the fact that it is in the regulatory phase and which inhibits security during this phase so as not to be tripped.
- a microprocessor system having in memory the set point indications of the sensors, could bring the device to safety according to the signals received from the sensors during a backflow but also based on signals from the burner reflecting the heating power at the instant considered.
- the subject of the invention is therefore a method of placing in safety of atmospheric bath heaters and boilers gas during the discharge of combustion products, putting using a single temperature sensor placed in the flow delivery of said combustion products, process which consists in interpreting both the measures of variation of sensor temperature versus time and measurement temperature of the combustion products upsets associated with information on the burner load so that safety is only applied if the measurement of the temperature is above a determined threshold corresponding to the power.
- FIG. 1 Partly shown in FIG. 1 is a boiler equipped with a burner 1, a heating body 2 to hot skirt surmounted by a draft hood 3 and a smoke evacuation duct 4.
- the draft hood in known manner has side air inlets 5 and deflectors 6 above these air inlets.
- a temperature sensor 7 in upper part of a deflector 6, that is to say in an area air inlet in normal operation, materialized by arrows 8. Combustion or smoke products escape from the heating body 2 to the duct 4, as shown by arrows 9.
- the temperature T will grow quickly and then stabilize at a maximum value.
- the method consists in associating with this measurement of the temperature T of the fumes by the sensor, information on the power under load of the burner.
- the device will be locked out only if the temperature sensor has detected a rapid change in temperature and if the measurement of this temperature is above a threshold T 1 corresponding to low power operation of the device, or at a threshold T 2 for high power operation, or an intermediate threshold for an intermediate power.
- the threshold between T 1 and T 2 is a linear function of the burner load and therefore of the power of the appliance. It adjusts automatically according to the instantaneous power of the device.
- the diagram in FIG. 4 shows that a safety instruction collected at the ET output is subject to the temperature variation dT / dt, which in the case of operation at low power could be greater than or equal to 0.5 ° per second, as well as the determination of the temperature T which must be greater than or equal to the temperature T 1 . In the case of high power operation the only difference is that the temperature T must be greater than or equal to the temperature T 2 .
- 10 is a derivation and 11 a hysteresis comparator.
- the reference 12 illustrates the comparison of a temperature with the threshold cutoff T.
- reference 13 represents ignition authorization followed by locking 14 towards authorization to request ignition 15.
- the temperature has generally not yet reached the cutoff threshold T.
- the dT / dt variation or slope is no more than about 0.1 ° per second. So you have to memorize the fact that at one point there was a rapid change in the temperature.
- This solution has the enormous advantage of being easily and instantly verifiable from the point of view electronic, each time the burner is ignited.
- the new process appears tolerant for chimneys with poor cold draft. Indeed a rapid variation of the temperature dT / dt is required for prevent the appliance from working.
- the dT / dt threshold is adjusted so as to allow time for thermal draft of settle down.
Description
Claims (3)
- Procédé de mise en sécurité de chauffe-bains et chaudières atmosphériques à gaz lors du refoulement des produits de combustion, mettant en oeuvre un seul capteur de température placé dans le flux de refoulement desdits produits de combustion caractérisé en ce que qu'il consiste à interpréter à la fois les mesures de variation dT / dt de température du capteur par rapport au temps, et la mesure instantanée de la température (T) des produits de combustion refoulés associée à la mesure de la charge du brûleur pour que la mise en sécurité n'intervienne que si la mesure de la température est supérieure à un seuil déterminé correspondant à la puissance.
- Procédé de mise en sécurité selon la revendication 1, caractérisé en ce que le seuil est compris entre des valeurs (T1) et (T2) correspondant respectivement à un fonctionnement à petite puissance et à grande puissance de l'appareil et en ce que le seuil est une fonction linéaire de la charge du brûleur.
- Procédé de mise en sécurité selon la revendication 1, caractérisé en ce qu'il consiste à mémoriser la variation rapide de température à l'aide d'un comparateur à hystérésis à deux seuils qui permet de conserver l'information de variation rapide de température caractéristique d'une obstruction du conduit d'évacuation des fumées.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9412523A FR2726071B1 (fr) | 1994-10-20 | 1994-10-20 | Procede de mise en securite de chauffe-bains et chaudieres atmospheriques a gaz lors du refoulement des produits de combustion |
FR9412523 | 1994-10-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0708299A1 EP0708299A1 (fr) | 1996-04-24 |
EP0708299B1 true EP0708299B1 (fr) | 1998-12-30 |
Family
ID=9468034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95402311A Expired - Lifetime EP0708299B1 (fr) | 1994-10-20 | 1995-10-17 | Procédé de mise en sécurité de chauffe-bains et chaudières atmosphériques à gaz lors du refoulement des produits de combustion |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0708299B1 (fr) |
AT (1) | ATE175266T1 (fr) |
DE (1) | DE69506991T2 (fr) |
ES (1) | ES2126851T3 (fr) |
FR (1) | FR2726071B1 (fr) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3020228C2 (de) * | 1980-05-24 | 1984-08-09 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | Sicherheitseinrichtung für brennstoffbeheizte Geräte |
DE3527706A1 (de) * | 1984-08-15 | 1986-02-27 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | Verfahren zum ermitteln eines abschaltkriteriums eines gasbeheizten geraetes und schaltung zur durchfuehrung des verfahrens |
FR2596501B1 (fr) * | 1986-03-28 | 1990-04-27 | Sdecc | Dispositif de securite pour chaudiere a gaz du type a ventilation mecanique controlee |
-
1994
- 1994-10-20 FR FR9412523A patent/FR2726071B1/fr not_active Expired - Fee Related
-
1995
- 1995-10-17 DE DE69506991T patent/DE69506991T2/de not_active Expired - Fee Related
- 1995-10-17 EP EP95402311A patent/EP0708299B1/fr not_active Expired - Lifetime
- 1995-10-17 ES ES95402311T patent/ES2126851T3/es not_active Expired - Lifetime
- 1995-10-17 AT AT95402311T patent/ATE175266T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE69506991T2 (de) | 1999-08-12 |
EP0708299A1 (fr) | 1996-04-24 |
ES2126851T3 (es) | 1999-04-01 |
FR2726071B1 (fr) | 1996-12-27 |
FR2726071A1 (fr) | 1996-04-26 |
DE69506991D1 (de) | 1999-02-11 |
ATE175266T1 (de) | 1999-01-15 |
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