EP0591563B1 - Boiler - Google Patents

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Publication number
EP0591563B1
EP0591563B1 EP19920116951 EP92116951A EP0591563B1 EP 0591563 B1 EP0591563 B1 EP 0591563B1 EP 19920116951 EP19920116951 EP 19920116951 EP 92116951 A EP92116951 A EP 92116951A EP 0591563 B1 EP0591563 B1 EP 0591563B1
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EP
European Patent Office
Prior art keywords
heating
partition wall
boiler according
hollow body
flue
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EP19920116951
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German (de)
French (fr)
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EP0591563A1 (en
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.)
Capito & Co Verwaltungsgesellschaft GmbH
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Capito & Co Verwaltungsgesellschaft GmbH
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Priority to DE4111232A priority Critical patent/DE4111232A1/en
Priority claimed from DE4111232A external-priority patent/DE4111232A1/en
Priority to DE4203849A priority patent/DE4203849A1/en
Priority claimed from DE4203849A external-priority patent/DE4203849A1/en
Application filed by Capito & Co Verwaltungsgesellschaft GmbH filed Critical Capito & Co Verwaltungsgesellschaft GmbH
Priority to AT92116951T priority patent/ATE155225T1/en
Priority to DE59208694T priority patent/DE59208694D1/en
Priority to EP19920116951 priority patent/EP0591563B1/en
Publication of EP0591563A1 publication Critical patent/EP0591563A1/en
Publication of EP0591563B1 publication Critical patent/EP0591563B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/263Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body with a dry-wall combustion chamber

Definitions

  • the application relates to a boiler according to the preamble of claim 1. Similar boilers of this type are known.
  • the second and even the third gas passages are repeatedly heated up until they exit the boiler from the hotter ones immediately adjacent, and the heat transfer to the liquid to be heated is thus deteriorated.
  • 1.2.2. The formation of condensation water in the second and in particular in the third passages on the surfaces around which the liquid A to be heated is washed occurs on the entire periphery of the partition between the flue gas and the liquid. It is very difficult to control, if at all, with an acceptable heating output required, if at all. This is particularly true if the size of the outer shell of the boiler (not shown in the drawings) exceeds the length of the entire combustion chamber including the flue gas collection box, so that the latter is completely washed by the cool liquid to be heated. 1.2.3.
  • the published patent application DE 33 44 858 relates to a three-pass boiler with the feature that the third train - separately from the combustion chamber - is guided as a tube or as a tube bundle through the heating medium. It has the following critical points: 2.1. The third train is practically its own combustion chamber and is completely in the cooling medium. The precautions against condensation are therefore difficult to implement. 2.2. The location of the third gas train is fixed. There is no possibility of varying the position to achieve optimal heat transfer in different conditions of the heating medium room of the boiler. 2.3. The constructive precautions for maintenance (large access door, additional cleaning openings) and the maintenance itself are complex. 2.4. The entire boiler is much larger than a normal boiler with the same heating output. 2.5.
  • the utility model DE-U-9015 265 relates to a boiler that is similar to the boiler of the application. However, it only apparently describes a three-pass boiler combustion chamber (see 3.1.3. And 3.2.1. Of this opinion).
  • the burner pot (7) (claim 1, description on page 7 paragraph 3-4, page 9 paragraph 3) 3.1.1.1 extends at its chimney end preferably up to a gap remaining around the width "s" to a somehow separately separately attached burner chamber cover (10) or 3.1.1.2 extends up to this burner chamber cover as long as the ribs and then instead of the gap has corresponding flue gas through openings .
  • the third train is formed by "U-shaped flue gas connecting lines" (25) (claims 1-8, description page 5 paragraph 1-5, page 8 paragraph 3, page 9 paragraph 4).
  • 3.1.3.1 The flue gas-like connection between the flue gas storage chamber (24) and the flue gas outlet chamber (23) is formed by "lines", "U-shaped channels”.
  • 3.1.3.2 The number of connections ranges from “at least one” to “several” to "preferably four”.
  • the positioning of the lines is distributed as evenly as possible in the combustion chamber frame between the ribs attached there, in “at least essentially the same angular division". They should “penetrate the heating surface formed by the ribs ".
  • the invention has for its object to use a simple, corrosion-proof and easy to maintain third heating gas train to run the heating gases from the burner side to the exhaust pipe, to design the second and third heating gas train as optimal heat transfer surfaces and particularly to achieve environmentally friendly exhaust gas values (including a particularly low NO x content), a compact design, particularly suitable for heating systems with a large amount of heating water, and particularly economical manufacture.
  • a boiler is shown schematically, through which the heating gases generated in the burner flow according to arrows I, II and III in three passes.
  • the three trains are cylindrical in shape, namely the first heating gas train (5) is formed by a hollow body (3) surrounding the burner flame at a distance. From this, the heating gases enter the second heating gas train (2) on a baffle wall (4), which immediately surrounds the hollow body (3) in an annular gap on all sides.
  • this second heating gas train is provided with slotted heat transfer ribs (12), the teeth of which are inclined and / or interlocked with the heating gas flow (PA 9).
  • the heating gases are then (preferably) directed downwards into the third heating gas train (10), which is designed as follows: 5.2.1. A smaller part of the space of the second heating gas train (2), which is sufficient for the flow of the heating gases, is divided by a partition (9). This partition is designed and installed in such a way that it forms a third train (10) for the heating gases in a single compact channel (PAe 1-4). 5.2.1.1. This channel leads into the exhaust gas room (7) (PA 5). 5.2.1.2. It has only a fraction of the cross section of the second train (2) (usually 20% - 30%), and only a correspondingly small part of the heating gas of the second train (2) touches the common partition (9). 5.2.1.3.
  • the third heating gas train (10) is positioned (PA 4) at the point of the overall combustion chamber periphery (1) which is most advantageous for the overall circumstances.
  • the cross section of the third heating gas train can be varied in a simple manner.
  • the attachment of slotted heat transfer fins (12) in the third heating gas train (10) on the surface carrying the heating medium with the teeth inclined in reverse in accordance with the reversal of the gas train there and / or their entanglement bring about very effective heat extraction shortly before the transition into the exhaust gas - Pipe (8) (PAe 9 and 10).
  • PAe 9 and 10 the exhaust gas - Pipe
  • the partition (9) 5.2.2.1. is shaped outwards parallel to the heat transfer surface (1) (13) (PA 3). This means that the size of the "hot combustion chamber” (3) is fully retained and the optimal combustion is not impaired. 5.2.2.2. If necessary, the partition (9) is simply additionally provided with an insulating layer. 5.2.2.3.
  • the side of the dividing wall facing the "hot combustion chamber” (3) or another location of the overall combustion chamber or the hollow body (3) has approximately 4 to 6 spacers (13) (PA 6), which are a distance between the "hot combustion chamber” and the partition (9) from about 5 to 20 mm. The resulting space is used for heating gas circulation from the second heating gas train.
  • the attached spacing devices (13) thus serve to further improve the use of the heating gas heat.
  • Guide ribs (13) can also serve as spacers and at the same time guide the exhaust gas in the desired manner. They are applied at an angle of, for example, approx. 30 ° to the second heating gas train (PA 7).
  • the partition wall can also be designed to carry the heating medium for cooling, but this would remove the advantages of being removable and of maintaining the full size of the "hot combustion chamber", aside from the high production costs. 5.2.2.5.
  • the partition (9) is provided on its side facing the baffle (4) with a baffle plate (16), which represents the center of the baffle (4) and forms the entire baffle (4) with other impact stones (PA 14).
  • the "hot combustion chamber” (3) 5.3.1. receives an extension (15) on the side facing the partition (9) up to the baffle (4) (PA 12). This extension also covers that part of the partition wall which is not yet covered by the "hot combustion chamber”. The entire partition (9) is thus protected against radiant heat, and a cooling gas flow is formed between the cover and the partition (with the aid of the above-mentioned spacing devices (13)). 5.3.2. To further improve the heating gas flow, an additional baffle plate can be attached to the extension (15) at its end, which is attached at a right or larger angle to the extension and the surface of which is aerodynamically produced. 5.3.3.
  • the safety bolts (11) + (14) for locking the partition (9) have the effect that the "hot combustion chamber” (3) can only be inserted when the partition is correctly inserted, and that the partition does not malfunction after the combustion chamber has been inserted is fixed (PA 8).
  • the construction according to the invention has only three to no weld gas in contact with the heating gas / heating medium.
  • the exhaust gas space (7) is very small, only touches a small section of the periphery of the overall combustion chamber (1) and is equipped with heat transfer fins (PA 10).
  • the present invention has the following effects: 6.1.
  • the third heating gas train - in addition to the second heating gas train - represents a full-fledged heat transfer surface. This heat transfer surface is brought to optimum effect by applying slotted heat transfer ribs (12).
  • the entire combustion chamber up to the end of the exhaust pipe is a compact unit. 6.4. Due to the smaller cross section of the third exhaust gas train, the flow rate of the cooled gas is greatly increased and thus the risk of deposits is prevented. 6.5.
  • the train of the boiler and the flue gas temperature can be easily influenced according to the requirements by the type of construction and by the variability, especially of the third train of heating gas. 6.6. Due to the design, the formation of condensate is easy to control and the risk of corrosion is minimal. 6.7. The risk of a leak due to production errors is minimal. 6.8.
  • the above characteristics of the boiler also make it particularly suitable for constructions with a larger heating water tank, in which the entire combustion chamber, including the flue gas chamber (7), is surrounded by the heating medium. 6.9. For maintenance or possible repairs, this boiler is freely accessible anywhere through the large door on the burner side (6) after removing two parts ("hot combustion chamber" (3) and partition (9) with baffle plate (16)). 6.10. The manufacturing costs are low. 6.11. Due to the early heat dissipation on the flame, the construction according to the invention offers a minimization of pollutant formation.

Description

Die Anmeldung betrifft einen Heizkessel nach dem Oberbegriff des Patentanspruchs 1. Derartige ähnliche Heizkessel sind bekannt.The application relates to a boiler according to the preamble of claim 1. Similar boilers of this type are known.

1. Die Offenlegungsschrift DE-A- 17 78 880 betrifft sowohl zweizügige als auch dreizügige Heizkessel. Dreizug-Heizkessel sind in den Patentansprüchen 9 bis 11 (Fig. 4 mit 27-31; und 5 mit 32-33) enthalten; die Konstruktionen der Dreizug-Heizkessel haben gewisse Ähnlichkeit mit dieser Erfindung. 1. The published patent application DE-A-17 78 880 relates to both two-pass and three-pass boilers. Three-pass boilers are contained in claims 9 to 11 (Fig. 4 with 27-31; and 5 with 32-33); the three-pass boiler designs are somewhat similar to this invention.

1.1. Folgende Merkmale der o.a. Offenlegungsschrift sind in diesem Zusammenhang von Bedeutung:
1.1.1. Diese Konstruktion führt den dritten Zug durch verschieden gestaltete Rauchgas-Kanäle auf die Rückseite des Kessels.
1.1.2. Diese Kanäle des dritten Zuges sind in einer Vielzahl um die ganze Peripherie der Feuerkammer (18) verteilt und unmittelbar neben und abwechselnd zwischen den Kanälen des zweiten Zuges angeordnet, indem die Kanäle sowohl des zweiten wie des dritten Zuges entweder dieselbe Wand haben oder (besonders anschaulich dargestellt in Fig.32,33) unmittelbar aneinander liegen. 1.1.3. Teilweise kommt hinzu, daß die Kanäle des dritten Zuges sogar von der Feuerkammer (erster Zug) nur durch eine metallische Wand getrennt sind.
1.1. The following features of the above-mentioned publication are important in this context:
1.1.1. This construction leads the third train through differently designed flue gas channels to the rear of the boiler.
1.1.2. These channels of the third train are distributed in a large number around the entire periphery of the fire chamber (18) and are arranged immediately next to and alternately between the channels of the second train, in that the channels of both the second and third trains either have the same wall or (particularly vividly) shown in Fig. 32,33) lie directly next to each other. 1.1.3. In addition, the channels of the third train are even separated from the fire chamber (first train) only by a metallic wall.

1.1.4. Der Gesamt-Querschnitt der zweiten und derjenige der dritten Züge sind sich jeweils praktisch gleich. 1.1.5. Die Konstruktionen weisen eine Vielzahl von Schweißnähten auf, die zum großen Teil von der zu erwärmenden Flüssigkeit und zugleich von einem Rauchgas-Zug berührt werden.
1.1.6. Die Produktionsvorgänge in dem Kessel und die Haltbarkeit des "Blindbodens" (Fig.5 und 33, Ziffer 22a) sind sehr problematisch.
1.1.7. Diese Konstruktionen benötigen einen großen Rauchgas-Sammelkasten, der den ganzen Umfang der Brennkammer umfaßt.
1.1.4. The total cross section of the second and one the third moves are practically the same. 1.1.5. The constructions have a large number of weld seams, most of which are touched by the liquid to be heated and at the same time by a flue gas train.
1.1.6. The production processes in the boiler and the durability of the "blind bottom" (Fig. 5 and 33, paragraph 22a) are very problematic.
1.1.7. These designs require a large flue gas collection box that spans the entire circumference of the combustion chamber.

1.2. Dies hat zur Folge:1.2. As a consequence:

1.2.1. Die zweiten und sogar die dritten Gaszüge werden bis zum Austritt aus dem Heizkessel immer wieder aus den unmittelbar benachbart angeordneten heißeren Zügen aufgeheizt, und damit wird der Wärme-Übergang an die zu erwärmende Flüssigkeit verschlechtert.
1.2.2. Die Schwitzwasser-Bildung in den zweiten und insbesondere in den dritten Zügen an deren von der zu erwärmenden Flüssigkeit A umspülten Flächen tritt an der gesamten Peripherie der Trennwand zwischen Rauchgas und Flüssigkeit auf. Sie ist - bei gleichzeitig erforderlicher annehmbarer Heizleistung -, wenn überhaupt, nur sehr schwer beherrschbar.
Dies gilt noch verstärkt, wenn die Größe des Heizkessel-Außenmantels (nicht in Zeichnungen enthalten) die Länge der Gesamtbrennkammer einschließlich Abgas-Sammelkasten überschreitet, so daß letzterer damit voll von der kühlen, zu erwärmenden Flüssigkeit umspült ist.
1.2.3. Die Möglichkeit besonderer Führung oder Ausstattung oder unterschiedlicher Querschnitte von unterschiedlich heißen Heizgas-Zügen zwecks optimaler Gestaltung des Wärmeübergangs an die zu erwärmende Flüssigkeit ist nicht gegeben.
1.2.4. Die Verschmutzung der Züge, besonders der dritten Züge, ist sehr kritisch wegen zu niedriger Rauchgas-Geschwindigkeit.
1.2.5. Die Reinigung und Wartung erfordern einen hohen Aufwand.
1.2.6. Die Konstruktionen weisen viele Schweißverbindungen auf, die z.T. zusätzlich flüssigkeitsdicht und drucksicher sein müssen; dadurch sind sie anfällig gegen Undichtigkeiten.
1.2.7. Die Konstruktionen sind in der Herstellung sehr teuer.
1.2.1. The second and even the third gas passages are repeatedly heated up until they exit the boiler from the hotter ones immediately adjacent, and the heat transfer to the liquid to be heated is thus deteriorated.
1.2.2. The formation of condensation water in the second and in particular in the third passages on the surfaces around which the liquid A to be heated is washed occurs on the entire periphery of the partition between the flue gas and the liquid. It is very difficult to control, if at all, with an acceptable heating output required, if at all.
This is particularly true if the size of the outer shell of the boiler (not shown in the drawings) exceeds the length of the entire combustion chamber including the flue gas collection box, so that the latter is completely washed by the cool liquid to be heated.
1.2.3. The possibility of special guidance or equipment or different cross-sections of differently hot heating gas trains for the optimal design of the heat transfer to the liquid to be heated is not given.
1.2.4. The pollution of the trains, especially the third puffs, is very critical due to low flue gas speed.
1.2.5. The cleaning and maintenance require a lot of effort.
1.2.6. The constructions have many welded connections, some of which must also be liquid-tight and pressure-proof; this makes them susceptible to leaks.
1.2.7. The constructions are very expensive to manufacture.

2. Die Offenlegungsschrift DE 33 44 858 betrifft einen dreizügigen Heizkessel mit dem Merkmal, daß der dritte Zug - separat von der Brennkammer - als Rohr oder als Rohrbündel durch das Heizmedium geführt wird.
Er hat folgende kritischen Punkte:
2.1. Der dritte Zug stellt praktisch eine eigene Brennkammer dar und liegt völlig im Kühlmedium. Die Vorkehrungen gegen Schwitzwasser-Bildung sind daher schwierig zu verwirklichen.
2.2. Die Lage des dritten Gas-Zuges ist festgelegt. Es fehlt die Variationsmöglichkeit der Position zur Erzielung eines optimalen Wärmeübergangs bei unterschiedlichen Bedingungen des Heizmedium-Raumes des Heizkessels.
2.3. Die konstruktiven Vorkehrungen für die Wartung (große Zugangstüre, zusätzliche Reinigungsöffnungen) und die Wartung selbst sind aufwendig.
2.4. Der gesamte Heizkessel ist wesentlich größer als ein normaler Heizkessel derselben Heizleistung.
2.5. Diese Konstruktion ist bei Heizkesseln mit größerem Heizmedium-Speicher, bei denen der Heizkessel-Außenmantel größer ist als die Länge der Brennkammer, besonders problematisch.
2.6. Die Herstell- und Reparaturschwierigkeiten und damit die entsprechenden Kosten sind relativ hoch.
2.7. Das Risiko der Undichtigkeit bei der Herstellung und durch Korrosion ist beachtlich.
2. The published patent application DE 33 44 858 relates to a three-pass boiler with the feature that the third train - separately from the combustion chamber - is guided as a tube or as a tube bundle through the heating medium.
It has the following critical points:
2.1. The third train is practically its own combustion chamber and is completely in the cooling medium. The precautions against condensation are therefore difficult to implement.
2.2. The location of the third gas train is fixed. There is no possibility of varying the position to achieve optimal heat transfer in different conditions of the heating medium room of the boiler.
2.3. The constructive precautions for maintenance (large access door, additional cleaning openings) and the maintenance itself are complex.
2.4. The entire boiler is much larger than a normal boiler with the same heating output.
2.5. This construction is particularly problematic for boilers with a larger heating medium store, in which the outer shell of the boiler is larger than the length of the combustion chamber.
2.6. The manufacturing and repair difficulties and thus the corresponding costs are relatively high.
2.7. The risk of leakage during manufacture and due to corrosion is considerable.

3. Die Gebrauchsmusterschrift DE-U-9015 265 betrifft einen Heizkessel, der Ähnlichkeiten mit dem Heizkessel der Anmeldung aufweist. Sie beschreibt aber nur scheinbar eine dreizügige Heizkessel-Brennkammer (s. 3.1.3. und 3.2.1. dieser Stellungnahme). 3. The utility model DE-U-9015 265 relates to a boiler that is similar to the boiler of the application. However, it only apparently describes a three-pass boiler combustion chamber (see 3.1.3. And 3.2.1. Of this opinion).

3.1. Ihre folgenden Merkmale sind in diesem Zusammenhang von Bedeutung: 3.1. The following characteristics are important in this context:

3.1.1. Der Brennertopf (7) (Anspruch 1, Beschreibung Seite 7 Abs.3-4, Seite 9 Abs.3)
3.1.1.1 reicht an seinem schornsteinseitigen Ende vorzugsweise bis auf einen in der Breite "s" rundum verbleibenden Spalt an einen irgendwie separat fest angebrachten Brennerraum-Verschlußdeckel (10) heran oder
3.1.1.2 zieht sich bis zu diesem Brennerraum-Verschlußdeckel so lang hin wie die Rippen und weist dann anstelle des Spaltes rundum entsprechende Rauchgas-Durchgangsöffnungen auf.
3.1.1. The burner pot (7) (claim 1, description on page 7 paragraph 3-4, page 9 paragraph 3)
3.1.1.1 extends at its chimney end preferably up to a gap remaining around the width "s" to a somehow separately separately attached burner chamber cover (10) or
3.1.1.2 extends up to this burner chamber cover as long as the ribs and then instead of the gap has corresponding flue gas through openings .

3.1.2. Deren Feuerraum-Zarge (12) (Ansprüche 1+10-15, Beschr. Seite 4, Seite 6 Abs.6, Seite 7,Abs.1) im zweiten Zug
3.1.2.1 weist eine bestimmte Art von Rippen (13) auf.
3.1.2.2 ist mit einer separat fest angebrachten Feuerraumzargen-Stirnwand (20) geschlossen.
3.1.2. Their combustion chamber frame (12) (claims 1 + 10-15, description page 4, page 6 paragraph 6, page 7, paragraph 1) in the second move
3.1.2.1 has a certain type of ribs (13).
3.1.2.2 is closed with a separately fixed firewall frame end wall (20).

3.1.3. Deren dritter Zug wird durch "U-förmige Rauchgas-Verbindungsleitungen" gebildet (25) (Ansprüche 1-8, Beschr. Seite 5 Abs.1-5, Seite 8 Abs.3, Seite 9 Abs.4). 3.1.3.1 Die Rauchgas-mäßige Verbindung zwischen der Rauchgas-Staukammer (24) und der Rauchgas-Auslaßkammer (23) wird gebildet durch "Leitungen", "U-förmige Kanäle".
3.1.3.2 Die Anzahl der Verbindungen reicht von "wenigstens eine" über "mehrere" bis zu "bevorzugt vier".
3.1.3.3. Die Positionierung der Leitungen ist möglichst gleichmäßig in der Feuerraum-Zarge zwischen den dort angebrachten Rippen verteilt, in "zumindest im wesentlichen gleicher Winkelteilung". Sie sollen "die von den Rippen gebildete Heizfläche ... durchsetzen".
3.1.3. The third train is formed by "U-shaped flue gas connecting lines" (25) (claims 1-8, description page 5 paragraph 1-5, page 8 paragraph 3, page 9 paragraph 4). 3.1.3.1 The flue gas-like connection between the flue gas storage chamber (24) and the flue gas outlet chamber (23) is formed by "lines", "U-shaped channels".
3.1.3.2 The number of connections ranges from "at least one" to "several" to "preferably four".
3.1.3.3. The positioning of the lines is distributed as evenly as possible in the combustion chamber frame between the ribs attached there, in "at least essentially the same angular division". They should "penetrate the heating surface formed by the ribs ...".

3.2. Somit hat diese Konstruktion die folgenden negativen Merkmale/Auswirkungen: 3.2. Thus, this construction has the following negative features / effects:

3.2.1. Sie hat nur zwei und keine drei heizenden GasZüge. Der dritte "Zug" (einfach oder mehrfach) ist nur eine einfache Leitung (25) für den Rauchgas-Transport. 3.2.1.1. Die Rauchgas-Leitungen stehen stark in Gefahr, entweder - bei kleinem Querschnitt - durch Ablagerungen zu verstopfen oder - bei großem Querschnitt - wegen zu geringer Erwärmung der Wandungen zu versotten.
3.2.1.2. Die (drei) Wandungen der (U-)Leitungen, die den Rauchgas-Zügen eins und zwei benachbart sind, werden durch diese wieder erwärmt und damit zugleich das Rauchgas in den Leitungen; diejenige Leitungswandung, die zugleich die Wandung der Feuerraumzarge bildet, wird zu stark abgekühlt.
3.2.1.3 In den Rauchgas-Leitungen ist die Temperatur des Rauchgases oder der Leitungswandungen nicht mehr beeinflußbar mit den Folgen zu hoher Rauchgas-Temperatur und der Versottung.
3.2.1. It has only two and no three heating gas trains. The third "train" (single or multiple) is just a single line (25) for the flue gas transport. 3.2.1.1. The flue gas pipes are at great risk of either - with a small cross-section - clogging due to deposits or - with a large cross-section - jamming due to insufficient heating of the walls.
3.2.1.2. The (three) walls of the (U) lines, which are adjacent to the flue gas flues one and two, are heated up again by them, and with it the flue gas in the lines; that line wall, which also forms the wall of the combustion chamber frame, is cooled down too much.
3.2.1.3 In the flue gas pipes, the temperature of the flue gas or the pipe walls can no longer be influenced, with the consequences of excessive flue gas temperature and sooting.

3.2.2. Die vorstehenden Probleme sind bei den vorteilhaften Heizsystemen mit größerem Heizwasser-Speicher wegen deren thermischer Trägheit um so kritischer.
3.2.3. Der eingebaute Brennerraum-Verschlußdeckel (10) und die eingebaute Feuerraumzargen-Stirnwand (20) machen die Wartung oder eine Reparatur relativ aufwendig, weil man zusätzliche, bedienbare Reinigungsöffnungen einbauen und bedienen, bzw. fest eingebaute, im Wege stehende Konstruktionsteile zunächst entfernen muß.
3.2.4. Die Herstellkosten sind konstruktionsbedingt erkennbar viel höher.
3.2.2. The above problems are all the more critical in the case of the advantageous heating systems with a larger heating water store because of their thermal inertia.
3.2.3. The built-in burner chamber sealing cover (10) and the built-in firebox end wall (20) make maintenance or repair relatively expensive because you have to install and operate additional, operable cleaning openings, or you have to first remove any built-in construction parts in the way.
3.2.4. The manufacturing costs are noticeably higher due to the design.

4. Demgegenüber liegt der Erfindung die Aufgabe zugrunde, mittels eines einfachen, korrosionssicheren und einfach zu wartenden dritten Heizgas-Zuges die Heizgase von der Brennerseite zum Abgasrohr zu führen, den zweiten und den dritten Heizgas-Zug als optimale Wärmeübergabe-Flächen zu gestalten sowie besonders umweltschonende Abgaswerte (u.a. besonders niedriger NOx-Anteil), eine kompakte Bauart, besonders geeignet für Heizsysteme mit großem Heizwasser-Inhalt, und eine besonders kostengünstige Herstellung zu erreichen. 4. In contrast, the invention has for its object to use a simple, corrosion-proof and easy to maintain third heating gas train to run the heating gases from the burner side to the exhaust pipe, to design the second and third heating gas train as optimal heat transfer surfaces and particularly to achieve environmentally friendly exhaust gas values (including a particularly low NO x content), a compact design, particularly suitable for heating systems with a large amount of heating water, and particularly economical manufacture.

Diese Aufgabe wird mit den Merkmalen des Patentanspruchs 1 gelöst. Weitere vorteilhafte Ausgestaltung dieser Erfindung gehen aus den Unteransprüchen hervor.This object is achieved with the features of patent claim 1. Further advantageous embodiments of this invention emerge from the subclaims.

5. Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung erläutert: 5. An exemplary embodiment of the invention is explained below with reference to the drawing:

5.1. In der Zeichnung ist schematisch ein Heizkessel gezeigt, der von den im Brenner erzeugten Heizgasen entsprechend den Pfeilen I, II und III in drei Zügen durchströmt wird. Die drei Züge sind zylindrisch geformt, und zwar wird der erste Heizgas-Zug (5) von einem die Brennerflamme mit Abstand umgebenden Hohlkörper (3) gebildet. Aus diesem treten die Heizgase nach Umkehrung an einer Prallwand (4) in den zweiten Heizgas-Zug (2) ein, der den Hohlkörper (3) unmittelbar allseitig in einem Ringspalt umgibt. Dieser zweite Heizgas-Zug ist zur Verbesserung des Wärmeübergangs mit geschlitzten Wärmeübergabe-Rippen (12) versehen, deren Zähne gegen die Heizgas-Strömung geneigt und/oder verschränkt sind (PA 9). 5.1. In the drawing, a boiler is shown schematically, through which the heating gases generated in the burner flow according to arrows I, II and III in three passes. The three trains are cylindrical in shape, namely the first heating gas train (5) is formed by a hollow body (3) surrounding the burner flame at a distance. From this, the heating gases enter the second heating gas train (2) on a baffle wall (4), which immediately surrounds the hollow body (3) in an annular gap on all sides. To improve the heat transfer, this second heating gas train is provided with slotted heat transfer ribs (12), the teeth of which are inclined and / or interlocked with the heating gas flow (PA 9).

5.2. Daraufhin werden die Heizgase (vorzugsweise) nach unten in den dritten Heizgas-Zug (10) geleitet, der wie folgt ausgebildet ist:
5.2.1. Ein kleinerer, aber für die Strömung der Heizgase ausreichender Teil des Raumes des zweiten Heizgas-Zuges (2) wird durch eine Trennwand (9) abgeteilt.
Diese Trennwand ist auf solche Weise gestaltet und eingebaut, daß sie für die Heizgase in einem einzigen kompakten Kanal einen dritten Zug (10) bildet (PAe 1 - 4).
5.2.1.1. Dieser Kanal führt bis in den Abgas-Raum (7) hinein (PA 5).
5.2.1.2. Er hat nur einen Bruchteil des Querschnitts des zweiten Zuges (2) (i.d.R. 20 % - 30 %), und nur ein entsprechend kleiner Teil des Heizgases des zweiten Zuges (2) berührt die-gemeinsame Trennwand (9).
5.2.1.3. Der dritte Heizgas-Zug (10) wird an der für die Gesamtumstände vorteilhaftesten Stelle der Gesamtbrennkammer-Peripherie (1) positioniert (PA 4).
5.2.1.4. Der dritte Heizgas-Zug ist auf einfache Weise im Querschnitt variierbar.
5.2.1.5. Die Anbringung von geschlitzten Wärmeübergaberippen (12) im dritten Heizgas-Zug (10) auf der Heizmedium-führenden Fläche mit umgekehrter Neigung der Zähne entsprechend der Umkehrung des dortigen Gaszuges und/oder deren Verschränkung bewirken einen sehr wirkungsvollen Wärmeentzug kurz vor dem Übergang in das Abgas-Rohr (8) (PAe 9 und 10).
5.2.1.6. Der dritte Heizgas-Zug ist in der Wärmeübergabe-Fähigkeit einfach variierbar. Will man z.B. zweckmäßigerweise im dritten Heizgas-Zug die Abgas-Temperatur erhöhen, so läßt man einige Rippen entfallen und setzt hier Sperren ein (PA 11), die ein zu schnelles Durchziehen der Heizgase verhindern und den Druck in der Brennkammer erhöhen. Dadurch würde auch nach dem Reinigen die Entnahme der Verbrennungsrückstände nochmals erleichtert.
5.2. The heating gases are then (preferably) directed downwards into the third heating gas train (10), which is designed as follows:
5.2.1. A smaller part of the space of the second heating gas train (2), which is sufficient for the flow of the heating gases, is divided by a partition (9).
This partition is designed and installed in such a way that it forms a third train (10) for the heating gases in a single compact channel (PAe 1-4).
5.2.1.1. This channel leads into the exhaust gas room (7) (PA 5).
5.2.1.2. It has only a fraction of the cross section of the second train (2) (usually 20% - 30%), and only a correspondingly small part of the heating gas of the second train (2) touches the common partition (9).
5.2.1.3. The third heating gas train (10) is positioned (PA 4) at the point of the overall combustion chamber periphery (1) which is most advantageous for the overall circumstances.
5.2.1.4. The cross section of the third heating gas train can be varied in a simple manner.
5.2.1.5. The attachment of slotted heat transfer fins (12) in the third heating gas train (10) on the surface carrying the heating medium with the teeth inclined in reverse in accordance with the reversal of the gas train there and / or their entanglement bring about very effective heat extraction shortly before the transition into the exhaust gas - Pipe (8) (PAe 9 and 10).
5.2.1.6. The third heating gas train is easily variable in the heat transfer capability. For example, if you want to increase the flue gas temperature expediently in the third heating gas train, you can omit some fins and use locks (PA 11) to prevent the heating gases from being drawn through too quickly and to increase the pressure in the combustion chamber. This would make it even easier to remove combustion residues after cleaning.

5.2.2. Die Trennwand (9)
5.2.2.1.ist parallel zur Wärmeübergabefläche (1) nach außen geformt (13) (PA 3). Dadurch bleibt die Größe der "heißen Brennkammer" (3) voll erhalten, und die optimale Verbrennung wird somit nicht beeinträchtigt.
5.2.2.2. Falls erforderlich, wird die Trennwand (9) einfach zusätzlich mit einer Isolierschicht versehen.
5.2.2.3. Die der "heißen Brennkammer" (3) zugewandte Seite der Trennwand oder eine andere Stelle der GesamtBrennkammer oder der Hohlkörper (3) weisen etwa 4 bis 6 Abstandhalter (13) auf (PA 6), die einen Abstand zwischen der "heißen Brennkammer" und der Trennwand (9) von etwa 5 bis 20 mm herstellen. Der entstehende Zwischenraum dient der Heizgas-Zirkulation aus dem zweiten Heizgas-Zug. Dadurch wird einerseits die "heiße Brennkammer" an dieser Stelle vor starker Aufheizung geschützt, andrerseits die starke Aufheizung der nicht Heizmedium-führenden Trennwand und damit des dritten Heizgas-Zuges verhindert. Damit dienen die angebrachten Abstand-Vorrichtungen (13) der weiterhin verbesserten Nutzung der Heizgas-Wärme.
Als Abstandhalter können auch Leit-Rippen (13) dienen und zugleich das Abgas auf die gewünschte Weise leiten. Sie sind im Winkel von z.B. ca. 30° schräg zum zweiten Heizgas-Zug aufgebracht (PA 7). Sie bewirken einen Heizgas-Zug zwischen der Trennwand (9) und der "heißen Brennkammer" (3), der durch die Schräglage der Rippen ständig gekühltes Heizgas von der benachbarten Heizmedium-führenden Fläche aufnimmt, sich erwärmt und die Wärme an die Heizmedium-führende Fläche auf der anderen Seite des dritten Heizgas-Zuges (10) wieder abgibt. Dadurch werden drei Seiten des dritten Heizgas-Zuges gegenüber dem ersten Heizgas-Zug ständig gekühlt.
5.2.2.4. Die Vorrichtung, die Trennwand (9) herauszunehmen, eröffnet durch die große Heizkessel-Türe der Brennerseite (6) völlig freien Zugang auch zu den sonst schwer zugänglichen Stellen des Heizkessels zum problemlosen Reinigen und Service (PA 8). Die Trennwand kann man zur Kühlung auch Heizmedium-führend gestalten, doch würden damit die Vorteile aus der Herausnehmbarkeit und aus der Erhaltung der vollen Größe der "heißen Brennkammer" entfallen, abgesehen von den hohen Kosten der Herstellung.
5.2.2.5. Die Trennwand (9) ist an ihrer der Prallwand (4) zugewandten Seite mit einer Prallscheibe (16) versehen, die die Mitte der Prallwand (4) darstellt und mit weiteren Prallsteinen die gesamte Prallwand (4) bildet (PA 14).
5.2.2. The partition (9)
5.2.2.1. is shaped outwards parallel to the heat transfer surface (1) (13) (PA 3). This means that the size of the "hot combustion chamber" (3) is fully retained and the optimal combustion is not impaired.
5.2.2.2. If necessary, the partition (9) is simply additionally provided with an insulating layer.
5.2.2.3. The side of the dividing wall facing the "hot combustion chamber" (3) or another location of the overall combustion chamber or the hollow body (3) has approximately 4 to 6 spacers (13) (PA 6), which are a distance between the "hot combustion chamber" and the partition (9) from about 5 to 20 mm. The resulting space is used for heating gas circulation from the second heating gas train. On the one hand, this protects the "hot combustion chamber" from excessive heating at this point, and on the other hand prevents the heating of the partition wall that does not carry the heating medium and thus the third heating gas train. The attached spacing devices (13) thus serve to further improve the use of the heating gas heat.
Guide ribs (13) can also serve as spacers and at the same time guide the exhaust gas in the desired manner. They are applied at an angle of, for example, approx. 30 ° to the second heating gas train (PA 7). They cause a heating gas train between the partition wall (9) and the "hot combustion chamber" (3) which, due to the inclined position of the ribs, absorbs continuously cooled heating gas from the adjacent surface which carries the heating medium, heats up and transfers the heat to the heating medium Releases the area on the other side of the third heating gas train (10). As a result, three sides of the third heating gas train are constantly cooled compared to the first heating gas train.
5.2.2.4. The device to remove the partition (9) opens completely free access through the large boiler door on the burner side (6) to the otherwise difficult to access areas of the boiler for easy cleaning and service (PA 8). The partition wall can also be designed to carry the heating medium for cooling, but this would remove the advantages of being removable and of maintaining the full size of the "hot combustion chamber", aside from the high production costs.
5.2.2.5. The partition (9) is provided on its side facing the baffle (4) with a baffle plate (16), which represents the center of the baffle (4) and forms the entire baffle (4) with other impact stones (PA 14).

5.3. Die "heiße Brennkammer" (3)
5.3.1. erhält auf der der Trennwand (9) zugekehrten Seite eine Verlängerung (15) bis gegen die Prallwand (4) (PA 12). Diese Verlängerung überdeckt auch den Teil der Trennwand, der durch die "heiße Brennkammer" noch nicht überdeckt ist. Somit ist die gesamte Trennwand (9) gegen Strahlungswärme geschützt, und es bildet sich zwischen der Überdeckung und der Trennwand (mit Hilfe der oben erwähnten Abstand-Vorrichtungen (13)) eine kühlende Gasströmung.
5.3.2. Zur weiteren Verbesserung der Heizgas-Strömung kann man auf der Verlängerung (15) an ihrem Ende eine zusätzliche Prallscheibe anbringen, die im rechten oder größeren Winkel zu der Verlängerung angebracht ist und deren Oberfläche strömungsgünstig hergestellt ist.
5.3.3. Die Sicherungsbolzen (11)+(14) zur Arretierung der Trennwand (9) bewirken, daß die "heiße Brennkammer" (3) nur dann eingeschoben werden kann, wenn die Trennwand richtig eingebracht ist, und daß die Trennwand nach dem Einschieben der Brennkammer störungsfrei fixiert ist (PA 8).
5.3. The "hot combustion chamber" (3)
5.3.1. receives an extension (15) on the side facing the partition (9) up to the baffle (4) (PA 12). This extension also covers that part of the partition wall which is not yet covered by the "hot combustion chamber". The entire partition (9) is thus protected against radiant heat, and a cooling gas flow is formed between the cover and the partition (with the aid of the above-mentioned spacing devices (13)).
5.3.2. To further improve the heating gas flow, an additional baffle plate can be attached to the extension (15) at its end, which is attached at a right or larger angle to the extension and the surface of which is aerodynamically produced.
5.3.3. The safety bolts (11) + (14) for locking the partition (9) have the effect that the "hot combustion chamber" (3) can only be inserted when the partition is correctly inserted, and that the partition does not malfunction after the combustion chamber has been inserted is fixed (PA 8).

5.4. Die erfindungsgemäße Konstruktion weist - je nach Ausführung - nur drei bis keine Heizgas/Heizmediumberührte Schweißnaht auf. 5.4. Depending on the design, the construction according to the invention has only three to no weld gas in contact with the heating gas / heating medium.

5.5. Der Abgas-Raum (7) ist sehr klein, berührt nur einen kleinen Ausschnitt der Peripherie der Gesamtbrennkammer (1) und ist dort mit Wärmeübergabe-Rippen ausgestattet (PA 10). 5.5. The exhaust gas space (7) is very small, only touches a small section of the periphery of the overall combustion chamber (1) and is equipped with heat transfer fins (PA 10).

6. Aufgrund dieser Merkmale hat zusammenfassend die vorliegende Erfindung die folgenden Wirkungen:
6.1. Der dritte Heizgas-Zug stellt - neben dem zweiten Heizgas-Zug - eine vollwertige Wärmeübergabefläche dar. Durch aufgebrachte geschlitzte Wärmeübergabe-Rippen (12) wird diese Wärmeübergabe-Fläche zur optimalen Wirkung gebracht.
6.2. Er bringt die Heizgase auf die erwünschte dem Schornstein zugewandte Seite des Heizkessels zum Abgas-Rohr (8). Damit entfällt ein separater "Zug", der nur der Abgas-Ableitung dienen würde.
6.3. Die ganze Brennkammer bis zum Ende des Abgasrohres ist eine kompakte Einheit.
6.4. Durch den kleineren Querschnitt des dritten Abgas-Zuges wird die Strömungsgeschwindigkeit gerade des abgekühlten Gases stark erhöht und damit der Gefahr von Ablagerungen vorgebeugt.
6.5. Der Zug des Heizkessels und die Abgas-Temperatur sind den Erfordernissen entsprechend durch die Art der Konstruktion und durch die Variabilität besonders des dritten Heizgas-Zuges einfach beeinflußbar.
6.6. Die Kondensatbildung ist konstruktionsbedingt gut beherrschbar, und die Korrosionsgefahr ist minimal.
6.7. Die Gefahr einer Undichtigkeit durch Produktionsfehler ist minimal.
6.8. Die vorstehenden Eigenschaften des Heizkessels machen ihn auch besonders geeignet für Konstruktionen mit größerem Heizwasser-Speicher, bei denen die gesamte Brennkammer einschließlich des Abgas-Raumes (7) vom Heizmedium umgeben ist.
6.9. Für die Wartung oder eventuelle Reparatur ist dieser Heizkessel nach der Wegnahme von zwei Teilen ("heiße Brennkammer" (3) und Trennwand (9) mit Prallscheibe (16)) ohne Werkzeug durch die große Türe der Brennerseite (6) überall frei zugängig.
6.10. Die Herstellkosten sind niedrig.
6.11. Die erfindungsgemäße Konstruktion bietet durch die frühzeitige Wärmeableitung an der Flamme eine Minimierung der Schadstoff-Bildung.
6. In summary, based on these features, the present invention has the following effects:
6.1. The third heating gas train - in addition to the second heating gas train - represents a full-fledged heat transfer surface. This heat transfer surface is brought to optimum effect by applying slotted heat transfer ribs (12).
6.2. He brings the heating gases to the desired side of the boiler facing the chimney to the exhaust pipe (8). This eliminates the need for a separate "train" that would only serve to discharge the exhaust gas.
6.3. The entire combustion chamber up to the end of the exhaust pipe is a compact unit.
6.4. Due to the smaller cross section of the third exhaust gas train, the flow rate of the cooled gas is greatly increased and thus the risk of deposits is prevented.
6.5. The train of the boiler and the flue gas temperature can be easily influenced according to the requirements by the type of construction and by the variability, especially of the third train of heating gas.
6.6. Due to the design, the formation of condensate is easy to control and the risk of corrosion is minimal.
6.7. The risk of a leak due to production errors is minimal.
6.8. The above characteristics of the boiler also make it particularly suitable for constructions with a larger heating water tank, in which the entire combustion chamber, including the flue gas chamber (7), is surrounded by the heating medium.
6.9. For maintenance or possible repairs, this boiler is freely accessible anywhere through the large door on the burner side (6) after removing two parts ("hot combustion chamber" (3) and partition (9) with baffle plate (16)).
6.10. The manufacturing costs are low.
6.11. Due to the early heat dissipation on the flame, the construction according to the invention offers a minimization of pollutant formation.

Claims (14)

  1. heating boiler for liquid or gaseous combustibles with three cylindrical heating flues, the first of which (5) being formed by a hollow body (3) which distantly surrounds the flame; after having been reversed at the deflector (4); the heating gases flow from this hollow body into the second heating flue (2) which is closely surrounded by the hollow body (3); from there they flow into the third heating flue (10) after repeated reversing at the burner side (6) of the heating boiler. The third heating flue (10) is one single channel which is only separated from the second heating flue by a partition wall (9) and is designed and equipped with mounting parts for heat transmission to the heating medium. The partition wall (9) and the hollow body (3) are distant from each other.
  2. heating boiler according to claim 1, characterized by a combustion chamber (1) preferably having a circular or oval or rectangular cross section with correspondingly formed parts, such as hollow body (3) or partition wall (9) or deflector plate (16).
  3. heating boiler according to claims 1 and 2 characterized by a partition wall whose central part (9) is adjusted to the form of the hollow body (3).
  4. heating boiler according to claims 1 - 3 characterized by a partition wall (9) being arranged below or above or at the side of the first heating flue or at any position within the second heating flue (2).
  5. heating boiler according to claims 1 - 4 characterized by a partition wall (9) extending to the exhaust gas chamber (7), which comprises the whole periphery of the combustion chamber (1) in the extent of the third heating flue.
  6. heating boiler according to claims 1 - 5, characterized by distance pieces (13) preferably being installed on the partition wall (9) at the side of the second heating flue or at another point of the combustion chamber or characterized by a special form of the hollow body at this point ensuring a distance of approximately 5 - 20 mm between the partition wall and the hollow body.
  7. heating boiler according to claim 6 characterized by distance pieces (13) being designed as heat transmitting ribs which are in an angle of 30 ° to the direction to the second heating flue.
  8. heating boiler according to claims 1 - 7 characterized by a removable partition wall (9) whose end - being directed to the burner side (6) - is fixed by safety pins (11) and the adjoining hollow body (3) and whose other end is protected against excessive pushing through by means of a further safety pin (14).
  9. heating boiler according to claims 1 - 8 characterized by the second heating flue (2) and the third heating flue (10) both being equipped with slotted heat transmitting ribs (12) with teeth which are inclined towards the opposite direction of the gas flow and / or formed crosswise.
  10. heating boiler according to claim 9, characterized by the incline of the teeth of the heat transmitting ribs in the third heating flue being in opposite direction to the teeth of the heat transmitting ribs of the second heating flue and the ribs extending to the exhaust gas chamber (7).
  11. heating boiler according to claim 9 or 10 characterized by some (for example 4) eliminated heat transmitting ribs in the third heating flue (10) and this space being closed by interlocks.
  12. heating boiler according to claims 1 - 11 chararcterized by the hollow body (3) having an elongation (15) at the side, which faces the partition wall (9), covering the whole partition wall (9) together with the hollow body (3) in a certain distance.
  13. heating boiler according to claim 12 characterized by a deflector plate being installed on the end of the elongation (15) in front of the deflector (4) in a rectangular or bigger angle to the elongation having a surface which is flow-promoting.
  14. heating boiler according to claims 1 - 13 characterized by a deflector plate (16) being installed on the partition wall (9) and making up the whole deflector (4) together with further deflector stones.
EP19920116951 1991-04-04 1992-10-03 Boiler Expired - Lifetime EP0591563B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE4111232A DE4111232A1 (en) 1991-04-04 1991-04-08 Heating boiler using liquid or gaseous fuels - has dividing wall in second heating gas flue, to form third flue, extending to wasted gas flue
DE4203849A DE4203849A1 (en) 1991-04-08 1992-02-10 Gas or oil burning heating boiler - has three fuel gas channels and third channel is on opposite side of partition
AT92116951T ATE155225T1 (en) 1992-10-03 1992-10-03 BOILER
DE59208694T DE59208694D1 (en) 1992-10-03 1992-10-03 boiler
EP19920116951 EP0591563B1 (en) 1991-04-04 1992-10-03 Boiler

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4110920 1991-04-04
DE4111232A DE4111232A1 (en) 1991-04-04 1991-04-08 Heating boiler using liquid or gaseous fuels - has dividing wall in second heating gas flue, to form third flue, extending to wasted gas flue
DE4203849A DE4203849A1 (en) 1991-04-08 1992-02-10 Gas or oil burning heating boiler - has three fuel gas channels and third channel is on opposite side of partition
EP19920116951 EP0591563B1 (en) 1991-04-04 1992-10-03 Boiler

Publications (2)

Publication Number Publication Date
EP0591563A1 EP0591563A1 (en) 1994-04-13
EP0591563B1 true EP0591563B1 (en) 1997-07-09

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE441778B (en) * 1984-03-30 1985-11-04 Ctc Ab HEATER WITH A CYLINDRICAL WATER MAGAZINE
DE8803410U1 (en) * 1988-03-14 1988-07-28 Carl Capito Gmbh, 5908 Neunkirchen, De
DE9015265U1 (en) * 1990-11-03 1991-01-17 Sbs B. Schmidt Gmbh & Co., 4402 Greven, De
DE4111232A1 (en) * 1991-04-04 1992-10-15 Capito Gmbh & Co Verwaltungsge Heating boiler using liquid or gaseous fuels - has dividing wall in second heating gas flue, to form third flue, extending to wasted gas flue

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