SU1377437A1 - Method of preliminary preparation of fuel for internal combustion engine - Google Patents

Abstract

The invention makes it possible to increase the detonation resistance of fuels for spark ignited engines, to improve the dispersion and quality of the air-fuel mixture, and to reduce the consumption of the main component of the fuel. A hermetic fuel tank with a capacity of 25 liters is filled with 20 liters of liquid hydrocarbon fuel. A natural combustible gas, for example methane, is fed into the filled tank through a mixing device under an overpressure of 20.0 MPa. The gas-liquid mixture is withdrawn from the tank from its lowest point. In the pressure range from 0 to 2.0 MPa, the engine power and carbon monoxide content remain almost unchanged. Saturation of liquid fuels with natural gas at pressures above 20.0 MPa leads to a decrease in the effective power of the engine. As a liquid fuel, m. gasoline with a density of not more than 700 kg / m or liquefied propane-but-gas is used. 2 hp f-ly, 3 ill. &

Description

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The invention relates to the operation of internal combustion engines, in particular to methods of pretreatment of fuel, and can be used to power a vehicle engine with a liquid-gas fuel.

The purpose of the invention is to increase the detonation resistance of fuel for DVI

spark ignition heaters, improved dispersion and quality of the fuel-air mixture, as well as reduced consumption of the liquid component of the fuel.

Fig. I represents the dependence of the solubility of natural gas in liquid fuels on pressure (a is gasoline with a density of 670 b being gasoline

density of 700 kg / m; in - gasoline raft-20 1 units with an increase in content at

734 kg / m); Fig. 2 illustrates the effect of natural gas content G in the fuel on the detonation resistance of the gas-liquid mixture (g is A-76 gasoline; d is A-72 gasoline); Fig. 3 shows the dependences of the pressure and concentration of natural gas in the fuel on the dispersion of the mixture and the effective power of the engine operating on the gas-liquid mixture (k is the dispersion of the mixture; and C is the engine power).

Preliminary fuel preparation is carried out as follows.

Sealed fuel tank capacity

native gas to 5 wt.%. The dispersion of gas-liquid mixture dispersion and the quality (uniformity) of the fuel-air mixture are significantly improved.

25 at the saturation of liquid fuels with natural gas at pressures above 2.0 MPa. In the pressure range from 0 to 2.0 MPa, the engine power, the carbon monoxide content remain almost unchanged, as on regular gasoline, and the consumption of each fuel is reduced by the energy equivalent of natural gas. Saturation of liquid fuels with natural gas

25 liters fill 20 liters of liquid UHV 5 P pressure over 20.0 MPa results

to reduce the effective power of the engine. This is due to the fact that a further increase in the proportion of natural gas in the mixture leads to a significant

burnt fuel. The fuel tank filled with fuel is fed through a mixing device (bubbler) natural combustible gas, for example methane, under excess power and consumption characteristics, as well as the composition of exhaust gases is measured at the engine stand using a standard technique. The flow of gas-liquid mixture is fixed by the gravimetric method. The dispersion of the gas-liquid mixture is determined when the mixture flows out of the spray nozzle c. bore diameter of 2 mm. The dispersion of the sprayed drops is fixed photographically, followed by measuring the size of the droplets.

An increase in the content of natural gas in the liquid fuel leads to an increase in the detonation resistance of the mixture obtained. The octane number of the resulting mixture is increased by

native gas to 5 wt.%. The dispersion of gas-liquid mixture dispersion and the quality (uniformity) of the fuel-air mixture are significantly improved.

at saturation of liquid fuels with natural gas at a pressure above 2.0 MPa. In the pressure range from 0 to 2.0 MPa, the engine power, the carbon monoxide content remain almost unchanged, as on regular gasoline, and the consumption of each fuel is reduced by the energy equivalent to the addition of natural gas. Saturation of liquid fuels with natural gas

P pressure over 20.0 MPa leads

to reduce the effective power of the engine. This is due to the fact that a further increase in the proportion of natural gas in the mixture leads to a significant

pressure of 20.0 MPa. The saturation time of reducing the filling of the cylinders of the movement of fuel with natural gas to an equilibrium state of 10–18 min depends on the efficiency of the mixing device. The gas-liquid mixture is withdrawn from the tank from its lowest point. With this selection, the composition of the gas-liquid mixture does not change until the last portions of the mixture are taken and the pressure in the tank drops to 2.0 MPa.

According to the proposed method, liquid hydrocarbon fuels (gasoline A-72, A-76, AI-93) are saturated with natural gas (methane 90-98% by volume) at an overpressure of 2.0; 0.0 | 20.0 MPa. The content of dissolved natural gas is determined by volume. The octane number of gas-liquid mixtures is determined on the unit UIT-65 by the motor method.

gatel and therefore to a drop in engine power. The most optimal pressure range for saturation of fuel with natural gas is 2.0-20.0 MPa. Under these conditions, the economy of liquid fuels due to the use of natural gas as a fuel is from 5 to 25%. Thus, the proposed method ensures the retardation of the detonation resistance of the fuel, the improvement of the dispersion of dispersion and the quality of the fuel-air mixture, as well as the reduction of the consumption of the liquid component.

Claims (3)

1. A method of pretreating fuel for an internal combustion engine. It consists in saturating liquid fuel with gas under excessive pressure to an equilibrium state, characterized in that, in order to increase detonation resistance of the fuel, improve dispersion of the spray and the quality of the air-fuel mixture, as well as reducing the consumption of liquid fuel, the latter is considered natural Phie.} y 20 th 4 Xfffnifffmpaiffffi fffft / flffffMsff tffjff ,; Ф09.2 burnt gas (methane) under an overpressure of 2.0-20.0 MPa. 2. Method POP.1, which is different from the fact that gasoline with a density of not more than 700 kg / m is used as a liquid fuel. 3. Method pop. 1, which differs from the fact that liquefied propane-butane gas is used as a liquid fuel. 1Ci use, mpa   five- , Concentration nfJupodHOso gas Sfnofj / f / $ e .wc. / fce.d 15 2025 Pressure, mpa