FR2499702A1 - Heat recuperator for gas fired boiler - has two heat exchangers with one heating return radiator water and one heating boiler inlet air - Google Patents
Heat recuperator for gas fired boiler - has two heat exchangers with one heating return radiator water and one heating boiler inlet air Download PDFInfo
- Publication number
- FR2499702A1 FR2499702A1 FR8102628A FR8102628A FR2499702A1 FR 2499702 A1 FR2499702 A1 FR 2499702A1 FR 8102628 A FR8102628 A FR 8102628A FR 8102628 A FR8102628 A FR 8102628A FR 2499702 A1 FR2499702 A1 FR 2499702A1
- Authority
- FR
- France
- Prior art keywords
- heat
- exchanger
- heating
- air
- fumes
- 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.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
- F28D21/0007—Water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
- F28D21/0008—Air heaters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
ECONOMISEUR A CONDENSATION
POUR CHAUDIERE A EAU CHAUDE FONCTIONNANT AU GAZ
La présente invention concerne les appareils thermiques dénom més " économiseurs " qui permettent de récupérer les calories qui subsistent dans les fumées à la sortie des chaudiAres et à les transférer dans le circuit de chauffe en améliorant le rendement de l'installation.CONDENSATION SAVER
FOR GAS-HOT HOT WATER BOILER
The present invention relates to thermal appliances called "economizers" which make it possible to recover the calories which remain in the flue gases at the outlet of the boilers and to transfer them into the heating circuit by improving the efficiency of the installation.
Dans les appareils connus de ce genre, les fumées traversent plusieurs fois un faisceau tubulaire muni d'ailettes qui recueillent les calories et les transfèrent en définitive à l'eau du circuit de chauffage qui circule dans les tubes. Dans ces conditions, on ne peut espérer refroidir les fumées à une température inférieure à celle de l'eau au point le plus froid de l'installation de chauffage, c'est-àdire sur le collecteur de retour des radiateurs. Or, il peut être très intéressant de refroidir les fumées à plus basse température. C'est notamment le cas pour les chaudières qui utilisent des combustibles gazeux hydrogénés. Les produits de la combustion contiennent alors une forte proportion de vapeur d'eau que l'on a tout intérêt à condenser, afin d'en récupérer la chaleur latente laquelle représente environ I09 du pouvoir calorifique.Mais, pour ce faire, il faut évidemment descendre au-dessous du point de rosée qui, pour les gaz naturels, se situe aux alentours de 550C. L'expérience montre d'ailleurs que pour avoir moins de 550 en surface, il faut que l'eau qui circule dans l'échangeur soit à moins de 500. Si ces conditions sont réalisées quelques fois t mi-saison sur des installations largement dimensionnées, il n'en va pas de même dans la majorité des cas. In known devices of this kind, the fumes pass several times through a tubular bundle provided with fins which collect the calories and ultimately transfer them to the water of the heating circuit which circulates in the tubes. Under these conditions, one cannot hope to cool the fumes to a temperature lower than that of water at the coldest point of the heating installation, that is to say on the return manifold of the radiators. However, it can be very interesting to cool the fumes to a lower temperature. This is particularly the case for boilers that use hydrogenated gaseous fuels. The products of combustion then contain a high proportion of water vapor which it is in every interest to condense, in order to recover the latent heat which represents approximately I09 of the calorific value. But to do this, it is obviously necessary descend below the dew point which, for natural gases, is around 550C. Experience has shown that to have less than 550 on the surface, the water circulating in the exchanger must be less than 500. If these conditions are met a few times mid-season on large-scale installations , this is not the case in the majority of cases.
Pour remédier à cet inconvénient, l'économiseur selon l'inven- tion, comporte deux échangeurs en série sur le circuit des fumées. Le premier échangeur, traversé par ces dernières, est refroidi par l'eau du circuit de chauffage comme dans les économiseurs connus. Il récupère ainsi la majeure partie de la chaleur sensible des fumées et, si l'eau qui y circule est à moins de 500, il recueille également une partie de la chaleur latente de condensation de la vapeur d'eau. Dans le cas contraire, c'est-à-dire si la température de l'eau de retour des radiateurs est à plus de 500C, les fumées conservent toutes leur chaleur latente. Elles traversent alors le second échangeur constitué, comme le premier, d'un faisceau tubulaire à ailettes régnant sur deux compartiments de l'économiseur. To overcome this drawback, the economizer according to the invention comprises two exchangers in series on the flue gas circuit. The first exchanger, crossed by the latter, is cooled by water from the heating circuit as in known economizers. It thus recovers the major part of the sensible heat of the fumes and, if the water circulating there is less than 500, it also collects part of the latent heat of condensation of the water vapor. Otherwise, that is to say if the temperature of the return water from the radiators is above 500C, the fumes all retain their latent heat. They then pass through the second exchanger constituted, like the first, of a tubular bundle with fins reigning over two compartments of the economizer.
Dans le premier compartiment, les fumées cèdant leur chaleur aux ailettes, puis aux tubes et enfin à de l'eau qui circule à l'inté- rieur par thermosiphon. Cette eau transfere à son tour les calories vers le second compartimant où elle réchauff@ le prolengement du faisceau tubulaire à ailettes de l'échangeur. Dans ce second compartiment, l'échangeur cède à son tour ses caleries à de l'air que l'on fait passer au travers des ailettes.Cet air peut être celui du local de la chaufferie, mais il est plus intéressant d'y faire circuler naturellement ou mécaniquement l'air d'une piéce annexe @ituée à proximité et qui se trouve ainsi chauffée par les chaleurs ré@upérées. On conçoit que dans ces conditions, il n'y a plas d'impossi@@ité pour que la sur face du second échangeur en contact avec les funées soit @ moins de 55 C. In the first compartment, the fumes give off their heat to the fins, then to the tubes and finally to the water which circulates inside by thermosyphon. This water in turn transfers the calories to the second compartment where it heats the extension of the finned tube bundle of the exchanger. In this second compartment, the exchanger in turn gives up its heat exchangers to air that is passed through the fins. This air can be that of the boiler room, but it is more interesting to do circulate naturally or mechanically the air from an annex room located nearby and which is thus heated by reheated heat. It is understood that under these conditions, there is no impossi @@ ity so that the surface of the second exchanger in contact with the funnels is @ less than 55 C.
Le dessin annexé est une vue en conpe de l'é@onomiseur selon Il invention. The appended drawing is a cone view of the steam generator according to the invention.
Tel qu'il est représenté, l'échangeur principal (1) est constitué d'un faisceau vertical de tubes 4 ailettes reliant les deux col- lecteurs horizontaux d'entrée et de sortie de l'eau de retour des radiateurs. Les fumées chaudes, en provenance de la chaudiere, pénètrent dans l'économiseur par la buse d'entrée (2). Elles cheminent de haut en bas, et par un jeu de chicanes (3) traversent plusieurs fois le faisceau tubulaire (1). L'échangeur secondaire (4) est constitué d'un faisceau de tubes à ailettes légèrement incliné sur l'horizontale de telle manière que le liquide caloporteur situé à l'interieur puisse se déplacer par thermosiphon.Le liquide chaud monte le long de la génératrice supèrieure tandis que le liquide refroidi redescend le long de la génératrice inferieure. De plus, les tubes de ces échangeur traversent la paroi (6) qui sépare le compartiment des fumées (7) du compartiment de isair (8). As shown, the main exchanger (1) consists of a vertical bundle of 4-fin tubes connecting the two horizontal collectors for the inlet and outlet of the return water from the radiators. The hot smoke, coming from the boiler, enters the economizer through the inlet nozzle (2). They travel from top to bottom, and by a set of baffles (3) cross the tubular bundle (1) several times. The secondary exchanger (4) consists of a bundle of finned tubes slightly inclined to the horizontal so that the heat transfer liquid located inside can be moved by thermosiphon. The hot liquid rises along the generator upper while the cooled liquid descends along the lower generator. In addition, the tubes of these exchangers pass through the wall (6) which separates the smoke compartment (7) from the isair compartment (8).
Après avoir quitté l'échangeur (1), les fumées passent deux fois au travers de l'échangeur (4) et sont évacuées vers la cheminée par la buse de sortie 5). L'air frais provenant du local ou d'une pièce annexe pénètre par la buse (9) du compartiment (8) et ressort réchauffé par l'orifice (IO). After leaving the exchanger (1), the fumes pass twice through the exchanger (4) and are evacuated to the chimney by the outlet nozzle 5). Fresh air from the room or an annex room enters through the nozzle (9) of the compartment (8) and comes out heated by the orifice (IO).
L'eau de condensation en provenance des deux échangeurs et de la cheminée est collectée sur le fond incliné du compartiment (7) et évacuée à l'égout par le siphon (II) qui s'oppose à la sortie des fumées. The condensation water coming from the two exchangers and the chimney is collected on the inclined bottom of the compartment (7) and evacuated to the sewer by the siphon (II) which opposes the exit of the fumes.
L'économiseur, selon l'invention, permet de récupérer la majeure partie des chaleurs sensible et latente des produits de la combustion des chaudières à gaz. Les pertes à la cheminée peuvent ainsi être réduites à moins de 5% du pouvoir calorifique supèrieur d'un gaz hydrogéné tel que le gaz naturel. Ce résultat est obtenu quelle que soit la température de l'eau de retour de l'installation de chauffage, grâce à l'échangeur complémentaire refroidi par de l'air dont la température est toujours suffisamment basse pour que l'échangeur second daire soit à une température infèrieure à celle du point de rosée. The economizer according to the invention makes it possible to recover the major part of the sensible and latent heat of the products of the combustion of gas boilers. Chimney losses can thus be reduced to less than 5% of the higher calorific value of a hydrogenated gas such as natural gas. This result is obtained whatever the temperature of the water returning from the heating installation, thanks to the additional exchanger cooled by air, the temperature of which is always low enough for the secondary exchanger to be at a temperature below that of the dew point.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8102628A FR2499702A1 (en) | 1981-02-09 | 1981-02-09 | Heat recuperator for gas fired boiler - has two heat exchangers with one heating return radiator water and one heating boiler inlet air |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8102628A FR2499702A1 (en) | 1981-02-09 | 1981-02-09 | Heat recuperator for gas fired boiler - has two heat exchangers with one heating return radiator water and one heating boiler inlet air |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2499702A1 true FR2499702A1 (en) | 1982-08-13 |
FR2499702B3 FR2499702B3 (en) | 1983-12-30 |
Family
ID=9255054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8102628A Granted FR2499702A1 (en) | 1981-02-09 | 1981-02-09 | Heat recuperator for gas fired boiler - has two heat exchangers with one heating return radiator water and one heating boiler inlet air |
Country Status (1)
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FR (1) | FR2499702A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0078207A2 (en) * | 1981-10-22 | 1983-05-04 | Chaffoteaux & Maury | Apparatus for the recuperation of calories from flue gases of gas heaters |
FR2532041A2 (en) * | 1982-08-20 | 1984-02-24 | Chaffoteaux Et Maury | Improvements to devices for recovering heat from the fumes issuing from gas-fired boilers. |
FR2552866A1 (en) * | 1982-12-01 | 1985-04-05 | Baudelet Guy | Device for the recovery of energy from smoke or steam, adaptable for any type of hot air duct |
US4751913A (en) * | 1985-10-15 | 1988-06-21 | Richard Vetter | Apparatus for heating water |
-
1981
- 1981-02-09 FR FR8102628A patent/FR2499702A1/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0078207A2 (en) * | 1981-10-22 | 1983-05-04 | Chaffoteaux & Maury | Apparatus for the recuperation of calories from flue gases of gas heaters |
EP0078207A3 (en) * | 1981-10-22 | 1983-06-29 | Chaffoteaux & Maury | Apparatus for the recuperation of calories from flue gases of gas heaters |
FR2532041A2 (en) * | 1982-08-20 | 1984-02-24 | Chaffoteaux Et Maury | Improvements to devices for recovering heat from the fumes issuing from gas-fired boilers. |
FR2552866A1 (en) * | 1982-12-01 | 1985-04-05 | Baudelet Guy | Device for the recovery of energy from smoke or steam, adaptable for any type of hot air duct |
US4751913A (en) * | 1985-10-15 | 1988-06-21 | Richard Vetter | Apparatus for heating water |
Also Published As
Publication number | Publication date |
---|---|
FR2499702B3 (en) | 1983-12-30 |
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Legal Events
Date | Code | Title | Description |
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ER | Errata listed in the french official journal (bopi) |
Free format text: 32/82 |