EP0040226A1 - Systeme de gaz d'echappement dans un appareil de combustion a impulsions - Google Patents

Systeme de gaz d'echappement dans un appareil de combustion a impulsions

Info

Publication number
EP0040226A1
EP0040226A1 EP80902245A EP80902245A EP0040226A1 EP 0040226 A1 EP0040226 A1 EP 0040226A1 EP 80902245 A EP80902245 A EP 80902245A EP 80902245 A EP80902245 A EP 80902245A EP 0040226 A1 EP0040226 A1 EP 0040226A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
chamber
cyclone chamber
silencer
combustion
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.)
Withdrawn
Application number
EP80902245A
Other languages
German (de)
English (en)
Inventor
Karl Börje OLSSON
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.)
Mareck BV
Original Assignee
Mareck BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mareck BV filed Critical Mareck BV
Publication of EP0040226A1 publication Critical patent/EP0040226A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C15/00—Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass
    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24—Water 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
    • F24H1/26—Water 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
    • 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
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel

Definitions

  • the present invention relates to an exhaust gas syte in a combustion apparatus operating with pulsating combus ⁇ tion and is of the kind disclosed in the preamble to the accompanying main claim.
  • the invention primarily relates to so-called pulsating burners of the kind described and shown in the U.S. patent specifications 3 267 986 and 3 853 453.
  • the exhaust gas system In order to be used practically, e.g. as a heat source in a dwelling, the exhaust gas system must have an effective silencer.
  • the exhaust gas system and parts incorporated therein such as silencers must therefore be of such a nature that they do not provide any substantial disturbing action on the flow sequence in the exhuast gas system, which would result in disturbances in the pulsating combustion sequence in the combustion chamber.
  • the pulsating burners in question are namely sensitive to variations in flow conditions.
  • the exhaust gas system should be formed such that combustion residues such as soot, sulphur dioxide and above all condensed water vapor as far as possible will not be able to collect and remain in the exhaust gas system.
  • this can be formed as illustrated in the U.S. patent 3 608 666. If such a silencer is connected into the exhaust gas conduit from a pulsating burner of the kind in question, the conduit between the pulsating burner and the silencer or the conduit after the silencer must have a length within predetermined limits for the pulsating burner to operate with stability, i.e. with a substantially constant frequency.
  • the length of the conduit between the pulsating burner and the silencer can be selected with a correct value relatively easily, whereas the length of the exhaust gas conduit between the silencer and the free atmosphere will in practice be depend ⁇ ent on the place where the pulsating burner is to be mounted, e.g. in the basement of a dwelling.
  • the length of the exhaust gas conduit from the silencer to the free atmosphere will thus vary from case to case, and if the length is not the right one for the pulsating burner in question, variations of the pulsating frequency will be obtained within a greater or less range, which in turn re ⁇ sults in deteriorated silencing and deteriorated- efficiency.
  • the object of the present invention is first of all to provide an exhaust gas system which to a substantial degree, or practically entirely, eliminates dependence on the length of the exhaust gas conduit from the silencer to the free atmosphere, but the invention also has the object of providing an exhaust gas system having advantageous proper ⁇ ties with regard to the requirements mentioned by way of introduction.
  • This is achieved with an exhaust gas system which in accordance with the invention has the distinguishing fea ⁇ tures disclosed in the following patent claims.
  • a specially formed cyclone chamber is connected between the combustion chamber and the silencer, which can be of known construction, e.g. according to the U.S. patent 3 608 666, i.e. a silencer giving good silencing and relatively free through-flow with small risk of deposits in the silencer.
  • the silencer By combining, in accordance with the invention, the silencer with the special cyclone chamber, it has been found that the length of the exhaust gas conduit from the silencer to the free atmosphere can be selected optionally according to requirements without this affecting the pulsating frequency, i.e. the frequency will keep to a substantially constant value.
  • the cyclone chamber is constructed such that it functions as a kind of one-way pressure barrier, which allows the pressure waves to go through the cyclone chamber and the silencer relatively freely, while it dampens their tendency to back up in the conduit between the cyclone chamber and the combustion chamber.
  • the cyclone-like whirling flow in the cyclone chamber is initiated by the gas flowing in tangentially in the vertical cyclone chamber and sweeping in a spiral path alon __ the walls of the chamber, entraining possible soot particles, sulphur dioxide and condensed water vapor which can have collected in the cyclone chamber during the starting period.
  • the soot particles and sulphur dioxide normally occur 5 in such small amounts that they do not affect operating conditions.
  • the amount of condensed water vapor can vary considerably depending on the temperature in the cyclone chamber. In turn this is dependent, inter alia, on the temperature of the medium surrounding the cyclone 0 chamber, which can be air or another gas, or a liquid medium which is usually water.
  • the temperature in the latter can be i relatively low on starting under certain conditions.
  • OMPI can lead to breakdown.
  • the cyclone chamber being substantially vertical and by the exhaust gas pipe from the combustion chamber to the cyclone chamber being taken into the cyclone chamber to form a heat spiral therein.
  • the condensate will namely remain on the wall of the cyclone chamber also in the area where the gas velocity is relatively low. At most, the condensate can run back again along the chamber wall, but the condensate will then meet inflowing hot gas which arrests the movement of the water downwards on the wall.
  • the heat spiral results in that the temperature in the cyclone chamber rises relatively rapidly during starting to a temperature resulting in that the condensate on the wall is vaporized correspondingly rapidly, so that the water vapor formed can depart through the outlet pipe without causing operational disturbances.
  • Fig. 1 is a schematic axial section through a hot-water boiler with a pulsating burner provided with an exhaust gas system in accordance with the invention
  • Fig. 2 is a section along the line 2-2 in Fig. 1.
  • the hot-water boiler 10 has an inlet 11 and and outlet 12.
  • the incoming water can have a relatively low temperature, e.g. about 20°C or lower.
  • the cyclone chamber 17 consists of a cylinder 21 with its central axis substantially vertical.
  • the cyclone rba ⁇ ihPT- O can also have some other form known per se, with the central axis arranged vertically.
  • the chamber is closed by dished end walls 21a, 21b.
  • the pipe 16 is taken in through the upper end wall 21a and is thereafter formed into a heat spiral 22 with a plural ⁇ ity of turns situated in the vicinity of the chamber wall. In the lower half of the chamber, the spiral terminates in an outlet end 23. This is situated in the vicinity of the chamber wall and is directed tangentially, as is apparent from Fig. 2.
  • the gas flowing into the cyclone chamber is' therefore guided into the chamber such that at least a portion of the gas flow after the first turn in the chamber will come back again to the outlet end 23 and flow past it from behind.
  • a kind of one-way pressure barrier is provided hereby, which counteracts the tendency of the pressure waves to migrate back again from the silencer and cyclone chamber up in the pipe 16 and to the combustion chamber 14.
  • the length of the outlet conduit 20 will therefore not noticeably affect the operational conditions in the combus ⁇ tion chamber, and this length can therefore be selected optionally to the length required for coming out into the free atmosphere from the place where the hot-water boiler is situated, e.g. in a dwelling.
  • An inlet opening in the form of the end 34 of the pipe 18 is arranged at approximately the same height above the lower end wall 21b or bottom of the chamber as the outlet end 23, i.e. in the lower half of the chamber.
  • This inlet end 34 is situated in the central area of the chamber, where the gas velocity has decreased and the flow is relatively quiet.
  • the pipe end 34 By the pipe end 34 being situated in the central area, it is free from condensate which collects on the chamber walls under certain conditions.
  • the condensate is circulated round under the influence of the gas flow which executes a spiral-shaped rotational movement in the chamber. Centri ⁇ fugal force thereby keeps the condensate against the ver ⁇ tical wall of the chamber.
  • the water When there are greater quantities of condensate, the water will run down along the chamber walls in a direction towards the bottom of the chamber, al ⁇ though without reaching the inlet end 34.
  • the exhaust gas system in accordance with the invention thus signifies a considerable improvement, since the cyclone chamber with its one-way pressure barrier allows an optional required length of the conduit 20 to the free atmosphere without affecting the functions of the pulsating burner, simultaneously as the cyclone chamber is disposed such that it guides possible condensate so that it does not cause operational disturbances, and so that the chamber enables rapid vaporization of the condensate and removal of the water vapor formed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

Dans un systeme de gaz d'echappement pour un bruleur a impulsions, une chambre de cyclone (17) est connectee entre la chambre de combusion (14) du bruleur a impulsions et un silencieux (19). La chambre a cyclone est construite pour former une barriere de pression a sens unique pour les vagues de pression dans le systeme de gaz d'echappement, de sorte que la conduite de sortie apres le silencieux puisse avoir une longueur variable, desiree a l'atmosphere. En meme temps la chambre a cyclone est adaptee pour empecher que le condensat a l'interieur ne provoque des variations de resistance d'ecoulement des gaz avec les ennuis de fonctionnement que cela entrainerait.
EP80902245A 1979-11-15 1980-11-14 Systeme de gaz d'echappement dans un appareil de combustion a impulsions Withdrawn EP0040226A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7909433A SE7909433L (sv) 1979-11-15 1979-11-15 Avgassystem vid en forbrenningsapparat for en pulserande forbrenning
SE7909433 1979-11-15

Publications (1)

Publication Number Publication Date
EP0040226A1 true EP0040226A1 (fr) 1981-11-25

Family

ID=20339321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80902245A Withdrawn EP0040226A1 (fr) 1979-11-15 1980-11-14 Systeme de gaz d'echappement dans un appareil de combustion a impulsions

Country Status (3)

Country Link
EP (1) EP0040226A1 (fr)
SE (1) SE7909433L (fr)
WO (1) WO1981001456A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158405A (ja) * 1982-03-15 1983-09-20 Toshiba Corp パルスバ−ナ用消音器

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8101456A1 *

Also Published As

Publication number Publication date
WO1981001456A1 (fr) 1981-05-28
SE7909433L (sv) 1981-05-16

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR GB NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19820106

RIN1 Information on inventor provided before grant (corrected)

Inventor name: OLSSON, KARL, BOERJE