Fuel or combustible substance composition comprising ammonia and at least one unsaturated alcohol

Abstract

The present invention relates to a fuel or combustible substance composition comprising ammonia and from 0.1 to 5% by weight, relative to the total weight of the composition, of one or more unsaturated alcohol(s) comprising from 3 to 12 carbon atoms. This composition can be used to fuel any device used to generate energy by combustion. The invention also relates to a method for generating energy, comprising supplying a device for generating energy by combustion (such as, in particular, an internal combustion engine or an industrial boiler) with such a composition, and also to the use of said unsaturated alcohol(s) to improve the combustion performance of a fuel or combustible substance composition comprising ammonia.

Description

[0001]DESCRIPTIONTITLE: Fuel or combustible composition comprising ammonia and at least one unsaturated alcohol The present invention relates to a fuel or combustible composition based on ammonia (NH3) comprising one or more unsaturated alcohol(s). The invention also relates to the use of such a composition as a fuel or combustible for supplying a combustion energy production system such as a heat engine or a boiler. STATE OF THE PRIOR ART In order to reduce greenhouse gas emissions generated by the combustion of hydrocarbon-based fuels, the international community is studying the use of alternative fuels with low carbon dioxide emissions. In this perspective, ammonia is considered an interesting solution, particularly for the transport sectors (particularly maritime transport) and for the production of electricity in gas turbines.Ammonia has multiple advantages, including but not limited to:- It is a completely carbon-free fuel that can be produced using different technologies, including from renewable hydrogen;- Its combustion does not generate emissions of carbon dioxide (CO2), sulfur gases (SOx), unburned hydrocarbons, or particulates;- It can be used in existing engines and heating systems, with minor adaptations. However, a significant difficulty encountered so far is the poor combustion performance of ammonia when used in combustion systems. Indeed, tests carried out so far using mixtures of air and ammonia have shown low flame speeds and a high minimum ignition energy.This fuel is difficult to self-ignite, the ammonia flame is relatively slow and is easily extinguished near the walls of the combustion chambers. These phenomena have a negative impact on combustion systems using ammonia as fuel. They limit combustion efficiency and reduce the operability ranges of the systems they supply (for example in the case of an engine: limitation of engine speed, limitation of the power output). They cause an increase in the energy consumption necessary to initiate combustion, and generate undesirable emissions of ammonia and nitrogen oxide in the exhaust. A solution proposed in the prior art consists of adding gaseous hydrogen to the ammonia, either by direct addition (as described for example in the publication by Frigo S et al entitled "Further Insight into the Possibility to Fuel a SI Engine with Ammonia plus Hydrogen", SAE Technical Paper Series.SAE International 400 Commonwealth Drive, Warrendale, PA, United States, 2014 or the publication by Mørch CS et al entitled “Ammonia / hydrogen mixture in an SI-engine: Engine performance and analysis of a proposed fuel system”, Fuel 2011, 90(2):854–64), or by cracking part of the ammonia into hydrogen as described for example in patent application US2017 / 348659. The disadvantage of this solution is that it requires either the use of a large reserve of hydrogen in or near the ammonia-fueled system, or the costly installation of an in-line ammonia cracking system. Other studies have proposed the addition of methane or dimethyl ether (DME) to ammonia, or the addition of conventional fossil fuel carbon fractions such as diesel or gasoline. However, these additions generate CO2 emissions from the degradation of hydrocarbon fractions during combustion.Furthermore, it is desirable to be able to formulate fuel and combustible compositions free of fossil-based bases. Application WO 2021 / 030876 describes a fuel composition comprising a mixture of ammonia and an aqueous solution of sugar (in particular fructose, glucose or sucrose), which has better combustion properties. However, it is necessary to use sugars at significant levels, greater than 10% of the fuel composition, to obtain satisfactory results. The use of such compositions therefore represents a relatively high cost and increases CO2 emissions resulting from the degradation of sugars during combustion. The present invention aims to remedy the problems described above, and in particular the problem of poor combustion performance of ammonia-based fuels.The Applicant has now discovered that the addition to ammonia of a particular additive consisting of one or more unsaturated alcohols makes it possible to achieve these objectives. The present invention thus relates to a fuel or combustible composition comprising ammonia and from 0.1 to 5% by mass, relative to the total mass of the composition, of one or more unsaturated alcohol(s) comprising from 3 to 12 carbon atoms. This composition has improved combustion performance, compared to fuel or combustible compositions based on ammonia. In particular, the presence of the unsaturated alcohol(s) in the composition makes it possible to significantly reduce the auto-ignition time, which is a good indicator of the chemical reactivity of the fuel / combustible mixture and air during the combustion process. The minimum ignition energy level is also substantially reduced.The flame speed is increased, which allows for good quality, controlled combustion without detonations. The combustion efficiency is also increased, which allows for a reduction in the consumption of fuel or ammonia-based combustible, which leads to energy savings and a reduction in the environmental impact linked to the production and transport of the fuel / combustible. The present invention does not require the use of significant quantities of unsaturated alcohol, contents of the order of one percent by mass being already very effective. The present invention also relates to the use of such a composition as a fuel or as a combustible in a device for producing energy by combustion, such as in particular an internal combustion engine or a boiler.The present invention also relates to the use of one or more unsaturated alcohol(s) comprising from 3 to 12 carbon atoms to improve the combustion performance of a fuel or combustible composition comprising ammonia, in particular to reduce the auto-ignition time, reduce the minimum ignition energy level, increase the flame speed and / or increase the combustion efficiency. The present invention finally relates to a method for producing energy comprising supplying a combustion energy production device (such as in particular an internal combustion engine or a boiler) with a composition according to the invention. Other objects, characteristics, aspects and advantages of the invention will appear even more clearly on reading the description and the examples which follow.In what follows, and unless otherwise indicated, the limits of a range of values ​​are included in this range, in particular in the expressions "between" and "ranging from ... to ...". Furthermore, the expressions "at least one" and "at least" used in the present description are respectively equivalent to the expressions "one or more" and "greater than or equal to". Finally, in a manner known per se, the term "compound or group in C" denotes. Na compound or group containing N carbon atoms in its chemical structure.DETAILED DESCRIPTIONThe fuel or combustible compositionThe composition according to the invention is based on ammonia, which is its main constituent.Ammonia denotes, in a manner known per se, the compound with the chemical formula NH3. It is therefore anhydrous ammonia and not aqueous ammonia, which in a manner also known per se denotes an aqueous solution of ammonia whose formula is generally noted NH3.H2O, NH4OH, or NH3aqueous. By "anhydrous ammonia" is meant that the ammonia does not include a substantial amount of water. However, the presence of water in a low content (in particular less than or equal to 5% by mass) in the ammonia is not excluded from the scope of the invention. For example, water may be present in small quantities to reduce the risk of corrosion of parts (particularly steel) in contact with the composition.Preferably, the water content of the composition according to the invention is less than or equal to 5% by mass, more preferably less than or equal to 3% by mass, better still less than or equal to 2% by mass and even better still less than or equal to 1% by mass, or even less than or equal to 0.5% by mass relative to the total mass of the composition. The composition according to the invention may comprise ammonia in the liquid state, in the gaseous state, or in these two states (in particular in the form of a liquid and gas equilibrium), depending on the temperature and pressure conditions at which it is found. In particular, at a pressure greater than 10 bar at room temperature or at a temperature lower than -33°C at room pressure, the ammonia is in the liquid state. This form is preferred. Preferably, the ammonia is at least partly in the liquid state, and preferably completely in the liquid state.The ammonia content of the composition is advantageously greater than or equal to 60% by mass, preferably greater than or equal to 70% by mass, more preferably greater than or equal to 80% by mass, even more preferably greater than or equal to 90% by mass and better still greater than or equal to 95% by mass, relative to the total mass of the composition. Unsaturated alcohols The composition comprises at least one unsaturated C3 to C alcohol. 12. In a manner known per se, an alcohol is an organic compound comprising at least one free hydroxyl function -OH. The alcohols used in the present invention are preferably mono-alcohols, i.e. compounds carrying a free hydroxyl function. Said alcohols may be mono-unsaturated (i.e. they comprise a double bond in the hydrocarbon chain) or poly-unsaturated (i.e. they comprise several double bonds and / or at least one triple bond in the hydrocarbon chain). Preferably, said alcohols are chosen from mono-unsaturated mono-alcohols and poly-unsaturated mono-alcohols. The unsaturated alcohols which can be used in the composition according to the invention are advantageously chosen from the compounds of formula (I) below: in which:- R1 denotes a linear or branched hydrocarbon group containing from 2 to 11 carbon atoms and comprising one or two double bonds;- R2 denotes a hydrogen atom or a linear or branched alkyl group containing from 1 to 8 carbon atoms; and- R3 denotes a hydrogen atom or a linear or branched alkyl group containing from 1 to 8 carbon atoms. Preferably, R1 denotes a linear or branched hydrocarbon group containing from 2 to 9 carbon atoms, more preferably from 2 to 7 carbon atoms, and comprising one or two double bonds. By hydrocarbon group, here is meant a group formed solely of carbon and hydrogen atoms. In other words, R1 denotes a group of formula C n H 2 n-1 or a group of formula C n H 2 n-3with n an integer ranging from 2 to 11, preferably from 2 to 9 and more preferably from 2 to 7.Preferably, R2 denotes a hydrogen atom or a linear or branched alkyl group containing 1 to 4 carbon atoms; preferably a hydrogen atom, a methyl group or an ethyl group; and more preferably a hydrogen atom or a methyl group.Preferably, R3 denotes a hydrogen atom or a linear or branched alkyl group containing 1 to 4 carbon atoms; preferably a hydrogen atom, a methyl group or an ethyl group; and more preferably a hydrogen atom or a methyl group.According to a preferred embodiment, the unsaturated alcohols are chosen from the compounds of formula (I) above, in which: - R1 denotes a linear or branched hydrocarbon group containing from 2 to 7 carbon atoms and comprising a double bond; - R2 denotes a hydrogen atom or a methyl group; and- R3 denotes a hydrogen atom or a methyl group.According to a preferred embodiment, the unsaturated alcohols are chosen from the following compounds: 3-methyl-2-buten-1-ol (or prenol), 3-methyl-3-buten-1-ol, 3-methyl-2-buten-1-ol, 2-methyl-3-buten-2-ol, 2-propen-1-ol, 3-buten-1-ol, 4-penten-1-ol, 3-buten-2-ol, 7-octen-1-ol, oct-1-en-3-ol (or octenol), and their. mélanges. 3-Methyl-2-buten-1-ol (or prenol) is particularly préféré.The total content of the unsaturated alcohol(s) is in the range from 0.1 to 5% by mass, relative to the total mass of the composition. Preferably, this content is in the range from 0.2 to 5% by mass, and better still from 0.5 to 5% by mass, relative to the total mass of the composition. According to one embodiment, the composition comprises one or more compounds of formula (I) as described above, including the preferred embodiments, in a total content in the range from 0.1 to 5% by mass, preferably from 0.2 to 5% by mass, better still from 0.5 to 5% by mass, and better still from 1 to 5% by mass, relative to the total mass of the composition.According to a more preferred embodiment, the composition comprises one or more compounds chosen from 3-methyl-2-buten-1-ol (or prenol), 3-methyl-3-buten-1-ol, 3-methyl-2-buten-1-ol, 2-methyl-3-buten-2-ol, 2-propen-1-ol, 3-buten-1-ol, 4-penten-1-ol, 3-buten-2-ol, 7-octen-1-ol, oct-1-en-3-ol (or octenol), and mixtures thereof, in a total content in the range from 0.1 to 5% by mass, from 0.2 to 5% by mass, better still from 0.5 to 5% by mass, and better still from 1 to 5% by mass, relative to the total mass of the composition. According to an equally preferred embodiment, the composition comprises 3-methyl-2-buten-1-ol (prenol) in a content ranging from 0.1 to 5% by mass, preferably from 0.2 to 5% by mass, better still from 0.5 to 5% by mass, and better still from 1 to 5% by mass, relative to the total mass of the composition.Other compounds The composition according to the invention may comprise one or more additional compounds, other than ammonia and C3 to C unsaturated alcohols. 12described above. It may thus comprise other bases, hydrocarbon or not, other than ammonia and unsaturated alcohols, as well as additives. It may, for example, contain one or more additives consisting of organonitrate(s), and in particular one or more alkyl nitrates. The alkyl nitrates which can be used in the composition according to the invention are advantageously chosen from the compounds of the following formula (I): R1-NO3 (I) with R1 denoting an alkyl or cycloalkyl radical comprising from 1 to 12 carbon atoms.Examples of alkyl nitrates include methyl nitrate, ethyl nitrate, propyl nitrate, iso-propyl nitrate, butyl nitrates (including n-butyl nitrate, 1-methyl-propyl nitrate, 2-methyl-propyl nitrate, tert-butyl nitrate, cyclobutyl nitrate), pentyl nitrates (e.g. amyl nitrate, iso-amyl nitrate, 2-amyl nitrate, 3-amyl nitrate), hexyl nitrate, heptyl nitrate, 2-heptyl nitrate, octyl nitrate, iso-octyl nitrate, 2-ethyl-hexyl nitrate, nonyl nitrate, decyl nitrate, undecyl nitrate, dodecyl nitrate, cyclopentyl nitrate, cyclohexyl nitrate, methyl cyclohexyl nitrate, and mixtures thereof. composés.Isopropyl nitrate and 2-ethylhexyl nitrate are preferred, and 2-ethylhexyl nitrate is particularly preferred. The alkyl nitrate(s) may be present in the composition according to the invention in a total content advantageously in the range from 0.005% (50 ppm) to 5% by mass, preferably from 0.01% (100 ppm) to 2% by mass, more preferably from 0.02% (200 ppm) to 1% by mass, relative to the total mass of the composition. The composition according to the invention may be prepared by simply mixing these ingredients. It is stable during storage.It may be prepared and stored in a tank for later use, or prepared extemporaneously (i.e. immediately before use), by mixing the ammonia and the unsaturated alcohol(s) in the fuel or combustible intake circuit in the combustion chamber, for example by injecting the unsaturated alcohol(s) into the ammonia intake pipe in the combustion chamber. L. es util isationsThe composition according to the invention is useful as a fuel or as a combustible for powering any device used to produce energy by combustion. According to a first embodiment, the composition according to the invention is used as a fuel for powering an internal combustion engine. In this embodiment, according to a first advantageous variant, the composition according to the invention is used as a fuel for powering a gas turbine. In a manner known per se, a gas turbine, also called a combustion turbine, is a thermodynamic rotating machine of the internal combustion engine family and which can be used for propulsion purposes, electricity production, or as a stationary engine (for example to drive pumps, compressors, etc.). According to a second, equally advantageous variant, the composition according to the invention is used as a fuel for powering a piston engine.In this variant, the composition is useful for powering any known piston engine, including on-board engines and stationary engines. The invention applies in particular to marine engines, heavy goods vehicles, construction machinery or agricultural machinery such as, for example, tractors, public transport vehicles (buses, trains, etc.) as well as to engines of light vehicles such as cars, engines used in aircraft or space propulsion (airplanes, rockets), as well as to engines used in stationary industrial applications. The piston engine may in particular be chosen from compression ignition engines or diesel engines, spark ignition engines (including gasoline engines, CNG or natural gas engines for vehicles and hydrogen engines), mixed fuel engines (in English "dual fuel").Preferably, the composition according to the invention is used to power a compression ignition engine or diesel engine. Particularly preferably, the compression ignition engine is a marine engine (i.e. an engine used for the propulsion of a ship). The composition according to the invention can be advantageously used to power a compression ignition engine with mixed carburetion (also commonly called a "dual fuel" engine). In this use, the fuel composition according to the invention powers the engine in combination with another fuel different from the latter, such as for example hydrogen and / or a hydrocarbon fuel, preferably a hydrocarbon fuel. By "hydrocarbon fuel" is meant in the present application a fuel comprising at least 50% by mass of hydrocarbons.The hydrocarbon fuel may be chosen from fuels of petroleum origin and in particular diesel and fuel oils of varying weight, renewable fuels (for example but not limited to those derived from biomass), and mixtures of these two types of fuels. According to a preferred embodiment, the hydrocarbon fuel is chosen from fuels based on diesel and / or heavy fuel oils of petroleum origin (such as marine fuels), bio-sourced fuels and mixtures thereof. The two fuels are injected in different proportions depending on the power required from the engine. The hydrocarbon fuel is advantageously injected into the engine in a small quantity, to initiate combustion by self-ignition mixed with air. This injection is called pilot injection. The fuel according to the invention is injected mixed with air to fuel the combustion.Mixed fuel engines are typically powered in the prior art by fuel combinations of diesel / gasoline, diesel / LPG, diesel / CNG, or diesel / ethanol. In the case of a marine engine, the mixed fuel engine is powered in particular by means of combinations of marine gas oil or MGO (from the English "Marine GasOil") / natural gas, MGO / methanol, MGO / ammonia. The use of a combination of hydrocarbon fuel and a fuel according to the invention having improved combustion performance makes it possible to significantly reduce the quantities of hydrocarbon fuel used for pilot injection, which makes it possible to reduce CO2 emissions, compared to the fuel combinations of the prior art.In the case, for example, of a mixed-fuel marine engine powered by a combination of the MGO / ammonia type, the improvement in the reactivity of the ammonia-based fuel makes it possible to reduce the quantity of pilot injection of MGO into the combustion chamber to initiate combustion and thus reduce the CO2 emissions linked to this pilot injection. Preferably, the composition according to the invention is used to power a mixed-fuel compression-ignition engine fitted to a ship (i.e. a marine diesel engine with carburetion). mixte).According to a second embodiment, the composition according to the invention is used as a fuel for powering an industrial boiler, such as, for example, those used to generate electrical or thermal energy. The first embodiment is preferred. Particularly preferably, the composition according to the invention is used as a fuel for powering a mixed-carburetion compression-ignition marine engine or a gas turbine (also called a combustion turbine). Furthermore, the present invention relates to the use of one or more unsaturated alcohol(s) comprising from 3 to 12 carbon atoms for improving the combustion performance of a fuel composition or combustible comprising ammonia.In particular, said alcohol(s) are used to reduce the auto-ignition time, reduce the minimum ignition energy level, increase the flame speed and / or increase the combustion efficiency of the composition. The unsaturated alcohol(s) are as described above. Preferably, they are present in a content in the range from 0.1 to 5% by mass, preferably from 0.2 to 5% by mass, better still from 0.5 to 5% by mass, and better still from 1 to 5% by mass, relative to the total mass of the composition. The fuel composition is as described above. In particular, its ammonia content is advantageously greater than or equal to 60% by mass, preferably greater than or equal to 70% by mass, more preferably greater than or equal to 80% by mass, even more preferably greater than or equal to 90% by mass and better still greater than or equal to 95% by mass, relative to the total mass of the composition.The method The method of producing energy according to the present invention comprises supplying a combustion energy production device with a fuel or combustible composition as described above. The energy production device may be chosen from any existing device, including but not limited to internal combustion engines and industrial boilers as described above. avant. Preferably, the energy production device is chosen from compression ignition engines and gas turbines (or combustion turbines). According to a first variant, the method according to the invention comprises supplying said energy production device with the composition according to the invention from a reservoir containing it. According to a second embodiment, the method according to the invention comprises: (1) a step of mixing ammonia and one or more unsaturated C3 to C alcohol(s) 12as described above in a content of 0.1 to 5% by mass relative to the total mass of the mixture; then (2) injecting the mixture from step (1) into the combustion chamber of said energy production device. The mixing step (1) can be carried out for example in the fuel intake circuit towards the combustion chamber, for example by injecting the unsaturated alcohol(s) into the ammonia flow supplying the engine, upstream of the combustion chamber. According to a preferred embodiment, the energy production device is a compression ignition engine with mixed carburetion (or “dual fuel” engine). In this embodiment, the method according to the invention comprises supplying the compression ignition engine with the fuel composition according to the invention and with another fuel different from the latter, preferably a hydrocarbon fuel as described above.The following examples are given for the purpose of illustrating the invention and should not be interpreted in such a way as to limit it. portée.EXAMPLES The reactivity of a fuel composition is characterized by its auto-ignition time, which can be measured using a shock tube. In the following examples, the thermodynamic conditions of the tube were adjusted to maintain a temperature of 1900 K and 2 bar (2.105 Pa) in the fuel mixture test zone. The auto-ignition time is determined by the time between the fuel mixture being pressurized in the test zone of the shock tube after the reflected shock wave has passed and the pressure of 2 bar is reached and the start of combustion detected using a pressure sensor located in the test zone, as well as the peak of OH* radical emissions measured by an optical detector at the wavelength located at 309 μm. A fuel composition C in accordance with the invention was prepared from anhydrous ammonia (NH3) and 3-methyl-2-buten-1-ol (prenol) and compared to a reference fuel R consisting of anhydrous ammonia.For each composition, the self-ignition time was determined. The table below describes the compositions tested and the self-ignition time obtained for each. Composition RC Prenol content. - 1 (mol%) NH3100 content 99 (mol%) Prenol content - 4,8 (% by mass) NH3 content 100 95.2 (% by mass) Self-ignition time (in ms) 0.92 0.49Composition C provides a significant reduction in self-ignition time compared to reference composition R.

Claims

CLAIMS 1 . Composition de carburant ou de combustible comprenant de ammonia and from 0.1 to 5% by mass, relative to the total mass of the composition, of one or more unsaturated alcohol(s) comprising from 3 to 12 carbon atoms. 2 . Composition selon la revendication précédente, caractérisée en ce que sa teneur en ammoniac est supérieure ou égale à 60% en masse, preferably greater than or equal to 70% by mass, plus préférentiellement supérieure ou égale à 80% en masse, encore plus preferably greater than or equal to 90% by mass and better still greater than or equal to 95% by mass, relative to the total mass of the composition. . Composition selon l’une quelconque des revendications preceding, characterized in that the unsaturated alcohol(s) are choisis parmi les composés de formule (I) suivante : dans laquelle : - R1 denotes a linear or branched hydrocarbon group containing de 2 à 11 atomes de carbone et comportant une ou deux doubles liaisons ; - R2 denotes a hydrogen atom or a linear alkyl group or ramifié contenant 1 à 8 atomes de carbone ; et - R3 denotes a hydrogen atom or a linear alkyl group or ramifié contenant 1 à 8 atomes de carbone .

4. Composition selon la revendication précédente, caractérisée in that the unsaturated alcohol(s) are chosen from compounds of formule (I) dans laquelle : - R1 denotes a linear or branched hydrocarbon group containingde 2 à 7 atomes de carbone et comportant une double liaison ; - R2 désigne un atome d’hydrogène ou un groupe méthyle ; et - R3 denotes a hydrogen atom or a methyl group.

5. Composition selon l’une quelconque des revendications preceding, characterized in that the unsaturated alcohol(s) are chosen from the following compounds: 3-methyl-2-buten-1-ol (or prénol), le 3-méthyl-3-buten-1-ol, le 3-méthyl-2-buten-1-ol , le 2- méthyl-3-buten-2-ol , le 2-propen-1-ol, le 3-buten-1-ol, le 4-penten-1-ol, le 3-buten-2-ol, le 7-octen-1-ol, l’oct-1-èn-3-ol (ou octénol), et leurs mélanges, et de préférence la composit ion contient du 3-méthyl-2- buten-1-ol.

6. Composition selon l’une quelconque des revendications preceding, characterized in that the total content of the alcohol(s) insaturés est comprise dans la gamme allant de 0,2 à 5% en masse, et plus préférentiellement de 0,5 à 5% en masse, par rapport à la masse totale de la composit ion.

7. Utilisation d’une composition telle que définie dans l’une any of the preceding claims as fuel or as combustible dans un dispositif de production d’énergie par combustion, preferably chosen from an internal combustion engine and a chaudière telle qu’une chaudière industrielle.

8. Utilisat ion selon la revendication précédente, comme carburant pour alimenter une turbine à gaz.

9. Utilisation selon la revendication 7, comme carburant pour alimenter un moteur à pistons, de préférence choisi parmi les moteurs à compression ignition, spark ignition engines and moteurs à carburation mixte.

10. Utilisation selon la revendication précédente, characterized in that the piston engine is a compression ignition engine, preferably a compression ignition engine with carburation mixte et plus préférentiellement un moteur marin.

11. Utilisation selon l’une des revendications 9 et 10, caractérisée en ce que ladite composit ion de carburant al imente leengine in combination with a hydrocarbon fuel preferably chosen from fuels of petroleum origin, fuels renouvelables et les mélanges de ces deux types de carburants ; et plus préférentiellement choisi parmi les carburants à base de gazoles of petroleum origin, bio-sourced fuels and their blends.

12. Utilisation selon l’une des revendications 7 à 11, caractérisée en ce que ladite composition de carburant est préparée extemporaneously by mixing ammonia and alcohol(s) insaturé(s) dans le circuit d’admission du carburant ou du combustible in the combustion chamber, for example by injecting the unsaturated alcohol(s) into the ammonia inlet pipe into the combustion chamber. 1 3. Méthode de production d’énergie comprenant the supply of a combustion energy production device using a composition as defined in any one of the revendications 1 à 6.

14. Méthode selon la revendication précédente, caractérisée en ce que le dispositif de production d’énergie est choisi parmi les moteurs à allumage par compression et les turbines à gaz.

15. Méthode selon la revendication précédente, caractérisée en ce que le dispositif de production d’énergie est un moteur à allumage by mixed carburetion compression and in that it comprises supplying the engine with said fuel composition and with another fuel different from the latter, preferably a hydrocarbon fuel. 1 6. Utilisation d’un ou de plusieurs alcool(s) insaturé(s)comprising from 3 to 12 carbon atoms to improve the combustion performance of a fuel or combustible comprenant de l’ammoniac, de préférence pour réduire le auto-ignition delay, to reduce the minimum ignition energy level, to increase the flame speed and / or to increase the combustion efficiency of said composition.

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