DE3225926A1

DE3225926A1 - Apparatus for utilisation of the waste heat from combustion gases, with auxiliary ventilator as a draught intensifier, and also reheating to avoid stack sooting

Info

Publication number: DE3225926A1
Application number: DE19823225926
Authority: DE
Inventors: Horst 5240 Betzdorf Marotzke
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-07-10
Filing date: 1982-07-10
Publication date: 1984-01-12

Abstract

The apparatus serves to improve utilisation of combustion/exhaust gases by heat withdrawal and simultaneous heat transfer to another medium. Thus, in the case of heating units, to the heating circulation water. The apparatus is mounted on the gas side between the heating boiler and the exhaust gas stack and on the water side between the heating return and the boiler return. The degree of cooling of the exhaust gases and/or the waste heat utilisation are characterised by the exhaust gas temperature and heating return temperature on the one hand, and also by the structure of the apparatus on the other hand. The purpose and object of the apparatus are to decrease the exhaust gas temperatures to the dew point of water when heating oil is burnt - to undershoot the dew point of water when gas is burnt - and then to reheat the exhaust gases by about 15 to 20 DEG C in the interior of the apparatus. By this means a hazard-free fuel utilisation with heating oil EL up to about 98% and with natural gas or liquid gas of >/= 100% is achieved without the risk of stack sooting occurring which is otherwise conventional in exhaust heat recovery apparatuses. A small auxiliary ventilator with an ejector is responsible for overcoming the apparatus resistance, so that fault-free operation - independent of the outside air temperature - is ensured. An exhaust gas/bypass flap mounted on the apparatus head thermally isolates the heating boiler and apparatus from the chimney when the burner is shut down and thus prevents the otherwise conventional internal boiler losses as a result of air passage - and simultaneously prevents, by releasing the bypass opening, a cooling of the stack unit, by continuously passing warm heating space air through the chimney. Widely spread trials have shown that the installation of such an apparatus achieves a fuel saving between 18 and 33%. The amortisation times are between 2 and 3 years.

Description

Horst Marotzke, Ingenieur (])Horst Marotzke, engineer ( ] )

Steftinerstraße 15; 524 BotzdorfSteftinerstrasse 15; 524 Botzdorf

^:!Gerät zur Nutzung von Abwärme aus Verbre.nnungsgasen mit Hilfsventilator als Zugverstärker und Nachwärmung zur Vermeidung von Kamin versottung* ^:! Device for the use of waste heat from combustion gases with auxiliary fan as a draft amplifier and reheating to prevent chimney sooting *

Die Erfindung betrifft ein Gerat zur Nutzung der Abwärme aus Abgasen von Heizungs - bzw. Verbrennungsanlagen mit Hilsventilator als Zugverstärker, mit Abgasabsperrklappe und Abgasnachwärmung.The invention relates to a device for using the waste heat from exhaust gases of heating or combustion systems with auxiliary fan as a draft booster, with exhaust gas shut-off valve and exhaust gas reheating.

Der Erfindung liegt folgender Gedanke zugrunde:The invention is based on the following idea:

1. Die Abgase mittels Heizungsrücklaufwasser oder und sonstigem Brauchwasser abzukühlen und somit die den Abgasen entzogene Wärme dem Heizungsrücklauf- bzw. Brauchwasser, zu zuführen.1. The exhaust gases by means of heating return water or other domestic water to cool down and thus to feed the heat extracted from the flue gases to the heating return or service water.

2. Den fehlenden bzw. unzureichenden Kaminzug - bedingt durch die relativ kalten Abgase , hier vor allem bei höheren Außenlufttemperaturen sowie bei Brennereinschaltung - durch einen Hilsventilator zu er setzen. 2. The missing or insufficient chimney draft - due to the relative cold exhaust gases, especially at higher outside air temperatures as well as when the burner is switched on - to be set by an auxiliary fan.

3. Bei Brennerstillstand mittels selbsttätig arbeitender oder aber einer motorisch betriebener Absperrklappe den Wärmeerzeuger vom Kamin thermisch abzukoppeln um somit Auskühlverluste der Kesselanlage zu verhindern, jedoch gleichzeitig eine Kamindurchlüftung mittels warmer Heizraumluft durch den Hilsventilator hindurch zu gewährleisten.3. When the burner is at a standstill by means of automatically operating or else a motorized shut-off valve to thermally decouple the heat generator from the chimney in order to avoid cooling losses in the boiler system to prevent, but at the same time a chimney ventilation by means of warm boiler room air through the auxiliary fan.

4. Nachwärmung der abgekühlten Abgase zur Vermeidung von Kondensat bildung (Kaminversottung) im Kamin mittels innenliegendem Abgas wärmetauscherrohr. 4. Reheating of the cooled exhaust gases to avoid the formation of condensate (Chimney sooting) in the chimney by means of an internal exhaust gas heat exchanger pipe.

Horst Marotzke, Ing. (2)Horst Marotzke, engineer (2)

Stettinerstraße 15
5240 BetzdorfStettinerstraße 15
5240 Betzdorf

Funktions - υ. GerätebeschreibungFunction - υ. Device description

Die heißen bzw» warmen Abgase von Heizungs - und/oder Verbrennungsanlagen werden in der Zone 1 mittels Wärmetauscher 2 , welcher von Heizungs- oder Brauchwasser durchflossen wird, ent sprechend der Wassertemperaturen abgekühlt und die dabei anfallende Abwärme dem Heizkreislauf bzw. Wärmeabnehmer wieder zugeführt. The hot or »warm exhaust gases from heating and / or combustion systems are in zone 1 by means of heat exchanger 2, which is flowed through by heating or service water, accordingly The water temperature is cooled down and the resulting waste heat is fed back into the heating circuit or heat consumer.

Die nachfolgende Zone 3 ist als Beruhigungszone, Abgaswende kammer, Kondensat - u. Auffangbehälter für evtl. anfallende Schmutzpartikel ausgebildet.The following zone 3 is a calming zone, exhaust gas turning chamber, Condensate and collecting container designed for any dirt particles that may arise.

Die Zone 4, ein innenliegendes Abgassteigrohr dient zugleich der Abgasnachwärmung zur Vermeidung einer Nachkondensation der Abgase im Kamin.Zone 4, an internal exhaust gas riser pipe, also serves to reheat the exhaust gas to avoid post-condensation Exhaust gases in the chimney.

Aus der Zone 4 gelangen die Abgase über eine Absperrklappe 5 in die Zone 6/ einen dreh- und demontierbar ausgeführten Ge rätekopf. The exhaust gases come from zone 4 via a shut-off valve 5 into zone 6 / a rotatable and detachable device head.

Am Gerätekopf befindet sich ein Hilfsventilatoi'7 , welcher über eine Ejektordüse 8 die Zone 6 in einen dem Feuerraum angepaßten Unterdruck versetzt, sodaß die Abgase störungsfrei abgeführt werden. Dies ist besonders bei kleineren Kesselanlagen - und hier vor allem bei Brenneranlauf- für einen störungsfreien Betrieb erforderlich oder aber sinnvolleThere is an auxiliary ventilator at the head of the device, which over an ejector nozzle 8, the zone 6 in a matched to the furnace Negative pressure offset so that the exhaust gases can be discharged without interference. This is especially true for smaller boiler systems - and especially here when starting the burner - necessary or useful for trouble-free operation

Bei Brennerstillstand schließt die Absperrklappe und verhindert somit eine innere Kessel- und Geräteauskühlung bei jedoch gleichzeitiger Kamindurchlüftung mittel warmer Heizraumluft hindurch den Hilfsventilator.When the burner comes to a standstill, the shut-off valve closes and thus prevents the internal boiler and device from cooling down at the same time Chimney ventilation with warm boiler room air through the auxiliary fan.

Leersei teBlank page

Claims

* Device for the use of waste heat from combustion gases with auxiliary (3) fan as a draft booster, as well as reheating to avoid chimney sooting * Patent claims

1. The device has the object contained in the hot exhaust gases Heat by means of a heat exchanger through which heating or domestic water flows to transfer from the exhaust gases to water, the cooled exhaust gases to avoid post-condensation in the chimney in the subsequent Heat the middle pipe through the middle pipe accordingly and use an ejector as a traction amplifier and starting aid - fed by an auxiliary fan - to supply the exhaust gases with the necessary kinetic energy, When the burner is at a standstill, thermally decouple the boiler and device from the chimney while maintaining constant chimney flushing by means of warm boiler room air.

2. Apparatus according to claim 1, characterized in that the central tube 4 works as a reheater according to its dimensions and arrangement.

3. Apparatus according to claim 1, characterized in that one automatically working or motorized butterfly valve 5 is arranged on or in the central tube 4 as a thermal decoupling.

4. Apparatus according to claim 1, characterized in that that device for Cleaning and easy chimney adjustment has a rotatable and removable head 6.

5. Apparatus according to claim 1, characterized in that an ejector 8 fed by an auxiliary fan 7 acts as a tension booster and thus the auxiliary fan remains outside the exhaust gas paths _o