NO134569B

NO134569B -

Info

Publication number: NO134569B
Application number: NO2401/73A
Authority: NO
Inventors: H A G Carlsson
Original assignee: Monark Crescent Ab
Priority date: 1972-06-14
Filing date: 1973-06-07
Publication date: 1976-07-26
Also published as: GB1394779A; DD105300A5; CA971473A; US3852024A; JPS4949772A; SE410219B; DE2330122A1; NO134569C; PL86193B1; CS172977B2

Abstract

Tennanordning ved forgassningsbrennere.Ignition device for gasification burners.

Description

Foreliggende oppfinnelse 'vedrører en tennanordning ved forgassningsbrennere av den i patentkravets innledning angitte slag, The present invention relates to an ignition device for gasification burners of the type specified in the introduction of the patent claim,

Hvis det med glødestift skal oppnås tilfredstillende tennsikkerhet I forgassningsbrennere, må en liten -brenseldråpe (ben-sin, parafin eller dieselolje) treffe den glødend-e tråden. Spesielt viktig er dette -ved lave temperaturer og for motorkjøretøyvarmere med batteri spenning. Det t-e er imidlertid forbundet med stor ulempe å la brenselet dryppe ned på glødestiften under den etterfølgende normale forbrenning, da en i så fall kan få koksavleiringer, som kortslutter to eller flere trå-dslynger på glødestiftBn med overbelastning rg som følge av dette en ekstremt kort levelengde. For å løse dette problem har en tidligere f.eks. ordnet luftstrømningen slik at kun de første dråpene treffer glødestiften for tenningen og at de- siden under drift føres direkte ut på fbrgassningsflaten av luft-strømmen. Denne fremgangsmåte gjør- dog varmeren stillingsavhengig og medfører samtidig en sikkerhetsrisiko ettersom forbrenn-ings-luftviften må stå stille under glødestiftens oppvarmingstid. I andre tilfeller har en kapslet inn glød-etråden i en stålhylse på hvilken en- fordamper brenselet, samt lår tenningen tilveiebringes av en gnist, hvilket imidlertid'krever vekselstrøm eller pulserende likestrøm som transformeres opp i en tennspole. Dette system- gjør dog varmeren stillinguavhéngig- iifra tenningssynspunkt If satisfactory ignition reliability is to be achieved with a glow plug in gasification burners, a small drop of fuel (gasoline, kerosene or diesel oil) must hit the glowing wire. This is particularly important -at low temperatures and for motor vehicle heaters with battery voltage. However, it is associated with a major disadvantage to allow the fuel to drip onto the glow plug during the subsequent normal combustion, as in that case you can get coke deposits, which short-circuit two or more coils of wire on the glow plug Bn with overload rg as a result of this an extremely short life expectancy. To solve this problem, a previous e.g. arrange the air flow so that only the first drops hit the glow plug for the ignition and that then during operation they are carried directly out onto the fbrgassing surface by the air flow. This method, however, makes the heater dependent on position and at the same time entails a safety risk as the combustion air fan must stand still during the glow plug's heating time. In other cases, the filament is encapsulated in a steel sleeve on which the fuel evaporates, and the ignition is provided by a spark, which, however, requires alternating current or pulsating direct current which is transformed into an ignition coil. This system, however, makes the heater position-independent from an ignition point of view

Den foreliggende oppfinnelse løser på enkleste og billigste måte det overnevnte problem. The present invention solves the above-mentioned problem in the simplest and cheapest way.

Det karakteristiske for oppfinnelsen er definert i det etterfølgende patentkrav. The characteristic of the invention is defined in the subsequent patent claim.

Oppfinnelsen skal i det følgende beskrives med henvis-ning til tegningen som i lengdesnitt viser en forgassnlngsbrenner-med anordningen ifølge oppfinnelsen. The invention will be described in the following with reference to the drawing which shows a longitudinal section of a gasification burner with the device according to the invention.

På tegningen er 1. ett brenseltilførselsrør av kopper, hvilketr er-lagt inrr i erv lufttilførselskanal 2-. 3 er en turbulatar for forbrermingsluften. The drawing shows 1. a fuel supply pipe made of copper, which is inserted into the air supply duct 2-. 3 is a turbulator for the pre-braking air.

Brenselstilførselsrøret 1 munner ut i ett forga-ssning-slegeme 4 som utgjøres av ett platerør eller sintergods" eller even-tuelt ett platerør med innvendig kapillærvirkende klednings Inne i forgassningslegemet er det satt inn en glødestift 5* Rundt forgassningslegemet 4 er det anordnet ett brennkammerrør 6 i hvilket det er innsatt en flammeholder 7«;Brenselstilf ørselsrøret 1" munner ut r forgassningslegemet 4 relattvt nær gl-ødestiften 5* Derved, oppnås-følgende funksjon. Under glødestift ens' 5 oppva-rmingstid er brenselet av-stengt.. Forbrenning-sluftviften bør dog av sikkerhetshensyn arbeide. Brenselstilførselsrørets spiss'varmes-opp"av strålingen fra gløde-spiralen til en temperatur som klart overstiger brenselets kokepunkt. Når glødestiften 5 har nådd en passende temperatur,, kobles brenselstilførselen inn. The fuel supply pipe 1 opens into a gasification body 4 which is made up of a plate tube or sintered material or possibly a plate tube with an internal capillary coating. Inside the gasification body, a glow plug 5 is inserted. Around the gasification body 4, a combustion chamber tube 6 is arranged. in which a flame holder 7" is inserted; the fuel supply pipe 1" opens out of the carburizing body 4 relatively close to the glow plug 5* Thereby, the following function is achieved. During the glow plug's 5 heating time, the fuel is switched off. The combustion air fan should, however, work for safety reasons. The tip of the fuel supply pipe is heated by the radiation from the glow coil to a temperature that clearly exceeds the fuel's boiling point. When the glow plug 5 has reached a suitable temperature, the fuel supply is switched on.

I løpet av de første sekunder skjer en så kraftig, avkokning fra brenselrøret 1 at små finfordelte brenseldråper gjentagende ganger skytes mot glødespiralen og setter i gang forbrenningen. Etter en kort tid bevirker brens els trammen er: re<5 kjæ-ling, av brenselstilførselsrøret 1 hvoretter brenselet på grunn av overflatespenningen flyter ut på forgassningsflaten eller forgassningslegemet 4 uten å vete glødestiften 5 sorn gjøres strømløs så fort forbrenningen er startet. Under drift varmer flammen opp glødestiften 5 til en temperatur som vesentlig overstiger brenselets kokepunkt. Om brenselet-derved skulle tillates å dryppe på stiften dannes koksavleiringer som ved neste start kortslutter glød-espiralene med følgende overbelastning og ekstrem kort leve-tid på glødestiften.. Dette, unngåes således ved oppfinnelsen samtidig som-, brenneren blir praktisk talt stillingsuavhengig. During the first few seconds, such a strong boiling occurs from the fuel pipe 1 that small, finely divided fuel droplets are repeatedly shot at the glow coil and initiate combustion. After a short time, the fuel els tram is: re<5 causes cooling, of the fuel supply pipe 1, after which the fuel, due to the surface tension, flows out onto the gasification surface or the gasification body 4 without wetting the glow plug 5, which is de-energized as soon as combustion has started. During operation, the flame heats up the glow plug 5 to a temperature that significantly exceeds the fuel's boiling point. If the fuel should thereby be allowed to drip onto the pin, coke deposits are formed which, at the next start, short-circuit the glow spirals with the following overload and extremely short lifetime of the glow pin.. This is thus avoided by the invention at the same time as-, the burner becomes practically independent of position.

Fordampningen i tennøyeblikket blir også med. anordningen i følge oppfinnelsen lokalt begrenset og, en kan derfor an-vende en glødestift med vesentlig lavere effekt-forbruk enn nor-malt. The evaporation at the moment of ignition is also included. the device according to the invention is locally limited and, one can therefore use a glow stick with significantly lower power consumption than normal.

Claims

Device for a gasification burner with a fuel supply pipe leading to the burner, a gasification body for gasification of the fuel during the burner's continued operation and a. glow plug which, only during the ignition process before the above-mentioned operation, heats up, carburates and ignites the fuel supplied through the fuel supply pipe, characterized in that the fuel supply pipe (i) is led through the carburisation body (il) in connection with this and that its outlet which is unprotected, the glow plug heat cg consists of a heat-conducting material, is located between the aforementioned f orbindeises location cg the glow plug (5)s is directed towards this - and placed so close to the glow plug (5) that during the ignition process in connection with a thereby for the glow plug. (5 y chosen appropriately., temperature , manages to heat the outlet of the pipe (-1) and

thus, through heat conduction, the heating takes fuel fed to this nozzle to such an extent that the fuel in the nozzle is subjected to a strong boiling, which leads to small fractions of fuel. drops of fuel are repeatedly shot at the glow plug (5), and that the mouth of the fuel supply pipe (1) and the carburizing body (4) are rotated in this way in relation to the glow plug (5), the fuel after the ignition sequence has ceased with the glow plug (5) still inoperative and the mouth of the fuel supply pipe (1), cooled by the fed fuel, drips down onto and from the surface tension flows out onto the gasifier body (m) without hitting the glow plug (5).