NO763889L

NO763889L -

Info

Publication number: NO763889L
Application number: NO763889A
Authority: NO
Inventors: H Hellemaa; J Larjola
Original assignee: Waertsilae Oy Ab
Priority date: 1975-11-17
Filing date: 1976-11-15
Publication date: 1977-05-20
Also published as: FI753224A; NL7612777A; DE2651280A1; SE7612695L; DK508076A; CH626688A5; FR2331681A1; FR2331681B1

Description

FORBEDRET DIESELMOTORENHET.IMPROVED DIESEL ENGINE UNIT.

Oppfinnelsen vedrorer en fremgangsmåte av det slag som er angitt i hovedkravets innledning og en anordning for tilpasning av denne fremgangsmåte. The invention relates to a method of the kind stated in the introduction of the main claim and a device for adapting this method.

Det er i og for seg kjent å anvende efterforbrenning spesielt i forbindelse med flyturbiner, men også i forbindelse med gasstur-biner forovrig. I slike tilfeller slutter imidlertid efterfor-brenningen seg direkte til gassturbinprosessen forovrig og tjener nærmest til å tilveiebringe et ekstra effekttilskudd-I forbindelse med dieselmotorer har man imidlertid ikke tidligere anvendt efterforbrenning forst og fremst på grunn av at bare den av motoren produserte mekaniske effekt har vært av interesse, og denne effekt har ikke i nevneverdig grad kunnet påvirkes ved hjelp av efterforbrenning. It is in and of itself known to use afterburning especially in connection with aircraft turbines, but also in connection with gas turbines in general. In such cases, however, the afterburning joins the rest of the gas turbine process directly and almost serves to provide an additional power supplement - In connection with diesel engines, however, afterburning has not previously been used primarily because only the mechanical power produced by the engine has been of interest, and this effect has not been able to be influenced to any significant extent by means of afterburning.

Oppfinnelsens formål er å forbedre totalvirkningsgraden for et dieselaggregat som anvendes for produksjon av såvel mekanisk energi som varmeenergi. Oppfinnelsens'karakteristiske trekk vil fremgå av krav 1. Ved på den angitte måte å utnytte motor-ens avgasser i en forbrenningsprosess oppnås en effektivisert produksjon av varmeenergi, hvorved anleggets totalvirkningsgrad okes betydelig. I sammenligning med et konvensjonelt anlegg om-fattende f.eks. en brenner og en kjel eller en annen varmeveksler, medforer oppfinnelsen den fordel at det oksygen som for-brennes i efterforbrenningsprosessen allerede ferdig har hoy temperatur, hvorved man vinner den varmeenergi som i en normal forbrenningsprosess fordres for å varme opp reaksjonsluften. The purpose of the invention is to improve the total efficiency of a diesel generator used for the production of both mechanical energy and heat energy. The invention's characteristic features will be apparent from claim 1. By utilizing the engine's exhaust gases in a combustion process in the specified manner, an efficient production of heat energy is achieved, whereby the plant's total efficiency is increased significantly. In comparison with a conventional plant including e.g. a burner and a boiler or another heat exchanger, the invention has the advantage that the oxygen that is burned in the post-combustion process is already at a high temperature, thereby gaining the heat energy that is required in a normal combustion process to heat the reaction air.

Den frigjorte energimengde kan ved behov reguleres såvel ved å variere den til forbrenningsanlegget innmatede avgassmengde samt ved å variere brenseltilforsélen. I det sistnevnte tilfelle kan regulering skje f.eks. ved å variere brenselets matningstrykk og/eller antall brenselavgivende munnstykker. The released amount of energy can, if necessary, be regulated both by varying the amount of exhaust gas fed to the combustion plant and by varying the fuel supply. In the latter case, regulation can take place e.g. by varying the fuel supply pressure and/or the number of fuel dispensing nozzles.

Hvis dieselmotoren ikke produserer avgasser i tilstrekkelig mengde for forbrenningsanleggets behov, f.eks. på grunn av at motoren overhodet ikke er i gang, eller går på tomgang, eller av eventuelle andre grunner, kan forbrenningsanlegget tilfores luft utenifra, slik at det derved helt eller delvis vil virke som en selvstendig energiproduserende enhet. If the diesel engine does not produce exhaust gases in sufficient quantity for the combustion plant's needs, e.g. due to the fact that the engine is not running at all, or is idling, or for any other reason, the combustion plant can be supplied with air from the outside, so that it will thereby fully or partially act as an independent energy-producing unit.

Som brensel i forbrenningsanlegget kan anvendes tung brenselolje, naturgass eller tilsvarende. Heavy fuel oil, natural gas or similar can be used as fuel in the combustion plant.

For tilpasning av den foran beskrevne fremgangsmåte er det hen-siktsmessig å anvende en anordning som omfatter en dieselmotor, en til denne koblet, av dieselmotorens mekaniske energi drevet anordning, et utlopssystem for dieselmotorens avgasser, et til dette koblet forbrenningsanlegg, og en egnet varmeveksler, f.eks. en avgasskjel. Avgassenes utlopssystem kan forsynes med en anordning, med hvilken den gassmengde som tilfores forbrenningsanlegget kan reguleres. For dette kan det anvendes en treveisventil, som når avgassmengden er for stor, via en lyddemper forer overskuddsgassen ut til atmosfæren. To adapt the method described above, it is appropriate to use a device that comprises a diesel engine, a device connected to it, driven by the diesel engine's mechanical energy, an outlet system for the diesel engine's exhaust gases, a combustion plant connected to it, and a suitable heat exchanger, e.g. an exhaust boiler. The exhaust gas outlet system can be provided with a device, with which the amount of gas supplied to the combustion plant can be regulated. For this, a three-way valve can be used, which, when the amount of exhaust gas is too large, feeds the excess gas out to the atmosphere via a silencer.

Brenselets matningstrykk kan reguleres med en til forbrenningsanlegget koblet brenselreguleringsanordning. Ved å forsyne forbrenningsanlegget med flere brenselinnmatningsmunnstykker kan den innmatede brenselmengde reguleres f.eks. ved å variere antall munnstykker som er i bruk, eller ved å anvende regulerbare munnstykker. The fuel supply pressure can be regulated with a fuel regulation device connected to the combustion plant. By supplying the combustion plant with several fuel feed nozzles, the fed fuel quantity can be regulated, e.g. by varying the number of nozzles in use, or by using adjustable nozzles.

Ved å anvende seg av en tilleggsanordning som ved behov blåser luft inn i forbrenningsanlegget, kan man få varmeeffekt fra anlegget også i slike tilfeller hvor dieselmotoren ikke produserer tilstrekkelige mengder avgasser i forhold til den onskede varmeeffekt. By using an additional device that blows air into the combustion plant if necessary, you can get heat output from the plant even in cases where the diesel engine does not produce sufficient amounts of exhaust gases in relation to the desired heat output.

Oppfinnelsen skal beskrives nærmere i det efterfolgende under henvisning til tegningen, hvis eneste figur skjematisk viser en anordning beregnet for tilpasning av fremgangsmåten ifolge The invention shall be described in more detail below with reference to the drawing, the only figure of which schematically shows a device intended for adaptation of the method according to

På tegningen betegner 1 en dieselmotor og 2 en anordning som direkte drives av den av dieselmotoren utviklede mekaniske energi. Anordningen 2 kan f.eks. utgjores av en generator. Motor-ens 1 avgasser fores via en treveisventil 3 enten til et efter-forbrenningsanlegg 4 og derfra til et som varmeveksler virkende avgasskammer 5, eller via en lyddemper 6 til atmosfæren. Hen-visnings tallet 7 angir en anordning som ved behov tilforer forbrenningsanlegget atmosfærisk luft. In the drawing, 1 denotes a diesel engine and 2 a device which is directly driven by the mechanical energy developed by the diesel engine. The device 2 can e.g. is performed by a generator. The engine's 1 exhaust is fed via a three-way valve 3 either to an afterburner 4 and from there to an exhaust gas chamber 5 acting as a heat exchanger, or via a silencer 6 to the atmosphere. The reference number 7 indicates a device which supplies the combustion plant with atmospheric air when necessary.

Oppfinnelsen er ikke begrenset til den viste utforelsesform, idet flere varianter og modifikasjoner kan tenkes innenfor rammen av kravene. The invention is not limited to the embodiment shown, as several variants and modifications are conceivable within the framework of the requirements.

Claims

1. Procedure for utilizing a diesel engine plant both for the production of mechanical energy and for the efficient production of heat energy, characterized in that the oxygen heated to a high temperature in the diesel engine's exhaust gases is used in a combustion process in which fuel supplied to a special combustion plant reacts with the oxygen, and that the heat energy thus released is taken care of in a heat exchanger.

2. Device as specified in claim 1, characterized in that the amount of energy released in the heat exchanger is regulated by varying the amount of exhaust gas fed to the combustor.

3. Device as specified in claim 1 or 2, characterized in that the amount of energy released in the heat exchanger is regulated by varying the fuel supply pressure in the combustion plant and/or the number of fuel-dispensing nozzles.

4. Device as stated in any of the preceding claims, characterized in that when the amount of exhaust gas given off by the diesel engine is insufficient, the combustion plant is supplied with air from the outside, so that the combustion plant acts wholly or partly as an independent energy-producing unit.

5. Device as specified in any of the preceding claims, characterized in that heavy fuel oil, natural gas or similar is used as fuel in the combustion plant.

6. Device for adaptation of any of the preceding claims, characterized in that it comprises a diesel engine (1), a device (2) connected to this connected by the diesel engine's mechanical energy, an outlet system (3-6) for the diesel engine's exhaust, another this connected combustion plant (4) and a suitable heat exchanger, e.g. an exhaust boiler (5).

7. Device as specified in claim 6, characterized in that the exhaust gas outlet system is provided with a device, e.g. a three-way valve (3), with which the amount of gas supplied to the combustion device (4) is regulated, e.g. by passing excess gas through a silencer to the atmosphere.

8. Device as stated in claim 6 or 7, characterized in that the combustion plant (4) comprises a fuel, regulation device, with which the fuel supply pressure can be regulated.

9. Device as stated in any of claims 6-8, characterized in that the combustion system (4) comprises several fuel feed nozzles, so that the amount of fuel supplied can be regulated by varying the nozzles in use.

10. Device as specified in any of claims 6-9, characterized in that the combustion plant includes a device for blowing air into the plant in such cases where the diesel engine does not produce sufficient amounts of exhaust gases in relation to the desired heating effect.