CN110747017B - Method for regulating and controlling low-pressure combustible limit of liquid hydrocarbon fuel based on combustion reaction path - Google Patents
Method for regulating and controlling low-pressure combustible limit of liquid hydrocarbon fuel based on combustion reaction path Download PDFInfo
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- CN110747017B CN110747017B CN201911103535.0A CN201911103535A CN110747017B CN 110747017 B CN110747017 B CN 110747017B CN 201911103535 A CN201911103535 A CN 201911103535A CN 110747017 B CN110747017 B CN 110747017B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/04—Liquid carbonaceous fuels essentially based on blends of hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/30—Organic compounds compounds not mentioned before (complexes)
- C10L1/301—Organic compounds compounds not mentioned before (complexes) derived from metals
- C10L1/303—Organic compounds compounds not mentioned before (complexes) derived from metals boron compounds
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- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Liquid Carbonaceous Fuels (AREA)
Abstract
A method for regulating and controlling the low-pressure combustible limit of liquid hydrocarbon fuel based on a combustion reaction path optimizes mixed fuel by configuring the mixed fuel comprising the liquid hydrocarbon fuel and boron-containing metal organic compound in a volume ratio of (85-95) to (5-15), and the regulation and control of the reaction path in the combustion process of the liquid hydrocarbon fuel can reduce the sensitivity of the liquid hydrocarbon fuel to pressure, so that the liquid hydrocarbon fuel can be reliably ignited and stably combusted under low pressure. The invention can promote the ignition and combustion of liquid hydrocarbon fuel in high-altitude low-pressure environment, and realize the widening of the flammability limit in low-pressure environment, thereby widening the flight envelope of the aircraft.
Description
Technical Field
The invention relates to a technology in the field of aviation fuels, in particular to a method for regulating and controlling low-pressure combustible limit of liquid hydrocarbon fuel based on a combustion reaction path, which can widen the combustible pressure to 0.3 bar.
Background
Due to the aircraft's flying height, the fuel in the engine is difficult to ignite or to stabilize combustion, resulting in insufficient engine thrust. The widening of the flight envelope of the aircraft is of great significance, and the existing flight envelope is generally widened through structural design, including the structural design of an aircraft engine, the aerodynamic appearance design of the aircraft and the like. These techniques can to some extent widen the flight envelope, but have limited performance and complex designs, with the need for specialized fuels for the subsequent engines. The essential reason that liquid hydrocarbon fuels cannot be combusted at low pressures is due to the high sensitivity of the liquid hydrocarbon fuel combustion reaction path itself to pressure variations. It would be of great importance if the combustion reaction path of liquid hydrocarbon fuels could be adjusted by adding additives, thereby widening the flammability limit of liquid hydrocarbon fuels at low pressure.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for regulating and controlling the low-pressure combustible limit of liquid hydrocarbon fuel based on a combustion reaction path, which reduces the sensitivity of the liquid hydrocarbon fuel to pressure by regulating and controlling the reaction path in the combustion process of the liquid hydrocarbon fuel, and realizes the reliable ignition and stable combustion of the liquid hydrocarbon fuel under low pressure. The invention can promote the ignition and combustion of liquid hydrocarbon fuel in high-altitude low-pressure environment, and realize the widening of the flammability limit in low-pressure environment, thereby widening the flight envelope of the aircraft.
The invention is realized by the following technical scheme:
the invention relates to a mixed fuel with wide combustible pressure, which comprises liquid hydrocarbon fuel and boron-containing metal organic compound, wherein the volume ratio of the liquid hydrocarbon fuel to the boron-containing metal organic compound is (85-95) to (5-15).
The liquid hydrocarbon fuel is n-hexadecane, n-dodecane, n-decane and aviation kerosene RP-3.
The boron-containing metal organic compound additive is triethylboron, tributylboron and diethyl methoxyborane.
The invention relates to a preparation method of the optimized mixed fuel, which takes liquid hydrocarbon fuel as substrate fuel and boron-containing metal organic compound as additive, and obtains the optimized mixed hydrocarbon fuel with widened low-pressure combustion limit after uniform mixing.
The proportion of the uniform mixing is that the volume ratio of the matrix fuel is 85-95 percent and the volume ratio of the boron-containing additive is 5-15 percent.
The uniform mixing is preferably performed by diffusion in an inert gas environment at normal pressure.
Technical effects
Compared with the prior art, the combustion reaction path regulating and controlling method based on the liquid hydrocarbon fuel can obviously reduce the lowest combustible pressure of the liquid hydrocarbon fuel, reduce the sensitivity of the combustible limit to the pressure, realize the broadening of the low-pressure combustible limit of the liquid hydrocarbon fuel, obviously reduce the ignition temperature of the liquid hydrocarbon fuel and improve the combustion stability. The method has the advantages of simple operation, wide performance regulation range, easy engineering application and the like.
Drawings
FIG. 1 is a low-pressure auto-ignition temperature test apparatus for fuel used in the example;
in the figure: 1 is an air inlet and outlet pipeline, 2 is a vacuum meter, 3 is a temperature controller, 4 is a hot plate, 5 is an injection hole, 6 is a sealing box, 7 is an LED lamp and 8 is an injector;
FIG. 2 is a graph of the low pressure flammability limits of the composite fuel of the example hexadecane (C16H34) and 10% diethylmethoxyborane (MDEB).
Detailed Description
Example 1
The composite fuel is prepared according to the following proportion:
step one, adding n-hexadecane into an argon-sealed fuel tank, wherein the volume percentage of the n-hexadecane is 90%;
step two, adding diethyl methoxyborane into the fuel tank added with the n-hexadecane, wherein the volume percentage content is 10%.
And step three, uniformly mixing the liquid in the fuel tank by standing for 30 min.
In this example, the flammability limit diagram of pure n-hexadecane and a composite fuel containing 10% diethylmethoxyborane was measured using a low pressure seal box experimental apparatus to illustrate the broadening effect of boron-containing additives on the low pressure flammability limit of liquid hydrocarbon fuels.
In the low-pressure seal box experimental device adopted in the embodiment, the seal box is formed by welding stainless steel plates, the pressure of the seal box is measured by a vacuum meter with the precision of 0.02bar, and the pressure in the seal box is changed from 1bar to 0.1bar by a vacuum pump with the air suction rate of 4 Lpmin.
The volume of the sealing box is 360mm x 400mm (length x width x height), the temperature range of the heating flat plate arranged in the box is from room temperature to 873K, and the control precision is +/-2K.
The fuel droplets are generated by a droplet generator.
The minimum flammable pressure of the composite fuel in this embodiment is 0.4bar, corresponding to a minimum ignition temperature of 448K.
Example 2
The composite fuel is prepared according to the following proportion:
step one, adding n-hexadecane into an argon-sealed fuel tank, wherein the volume percentage of the n-hexadecane is 95%;
step two, adding triethylborane into the fuel tank added with the n-hexadecane, wherein the volume percentage content is 5%.
And step three, standing for 30min to uniformly mix the liquid in the fuel tank.
In this example, the flammability limit of the composite fuel containing 5% triethylborane was measured using a low pressure seal box experimental set-up, and the minimum flammability pressure of the composite fuel in this example was 0.3bar, corresponding to a minimum ignition temperature of 408K.
Example 3
The composite fuel is prepared according to the following proportion:
step one, adding n-hexadecane into an argon-sealed fuel tank, wherein the volume percentage of the n-hexadecane is 95%;
and step two, adding tributyl borane into the fuel tank with the n-hexadecane added, wherein the volume percentage content is 5%.
And step three, standing for 30min to uniformly mix the liquid in the fuel tank.
In this example, the combustible limit of the composite fuel containing 5% tributylborane was measured using a low pressure seal box experimental apparatus, and the lowest combustible pressure of the composite fuel in this example was 0.5bar, which corresponds to a minimum ignition temperature of 428K.
Example 4
The composite fuel is prepared according to the following proportion:
step one, adding n-hexadecane into an argon-sealed fuel tank, wherein the volume percentage of the n-hexadecane is 85%;
and step two, adding diethyl methoxyborane into the fuel tank added with the n-hexadecane, wherein the volume percentage content is 15%.
And step three, standing for 30min to uniformly mix the liquid in the fuel tank.
In this example, the flammability limit of the composite fuel containing 15% diethylmethoxyalkane was measured using a low pressure seal box experimental set-up, and the minimum flammability pressure of the composite fuel in this example was 0.35bar, corresponding to a minimum ignition temperature of 435K.
The above method for adjusting the combustion path of hydrocarbon fuel is original and never disclosed, and the working mode is different from any prior document: the sensitivity to pressure of the liquid hydrocarbon fuel is reduced by regulating the combustion path under low pressure.
The details of the method for regulating and controlling the combustion reaction path of the liquid hydrocarbon fuel by the boron-containing metal organic compound additive to widen the low-pressure flammability limit are as follows:
through a low-pressure combustion experiment, the method for regulating and controlling the combustion reaction path of the liquid hydrocarbon fuel can effectively widen the combustible limit of the liquid hydrocarbon fuel, namely: the minimum flammable pressure of the composite fuel (triethylboron/hexadecane) was broadened to 0.3bar, corresponding to a minimum ignition temperature of 408K. The method realizes reliable ignition and stable combustion of the liquid hydrocarbon fuel under low pressure based on the adjustment of the combustion path, and fills the blank of the field.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (1)
1. The mixed fuel with wide combustible pressure is characterized by comprising the following components in percentage by weight: n-hexadecane as a liquid hydrocarbon fuel and diethylmethoxyborane, triethylborane or tributylborane as a boron containing metalorganic compound, wherein: the n-hexadecane accounts for 85 percent, 90 percent or 95 percent by volume, the boron-containing metal organic compound accounts for 15 percent, 10 percent or 5 percent by volume, and the lowest combustible pressure of the mixed fuel is 0.3, 0.35, 0.4 or 0.5 bar.
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| CN201911103535.0A CN110747017B (en) | 2019-11-13 | 2019-11-13 | Method for regulating and controlling low-pressure combustible limit of liquid hydrocarbon fuel based on combustion reaction path |
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| CN110747017B true CN110747017B (en) | 2021-06-22 |
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