The method of preparation of hydrocarbon fuel for gas turbine engine

 

The method relates to the field of cooking and feeding hydrocarbon fuel entering the gas turbine engine. Cooking fuel are overload it with gaseous nitrogen to nitrogen content in it 20...32 about. %, with an excess pressure above the mirror fuel tank of 0.8 to 1.4 MPa, followed by gaseous nitrogen through the layer of fuel while evacuating the cavity of the tank above the mirror fuel. In this way, the residual content in the fuel of oxygen of 0.1-0.3% water 0,0007-0,0009% and nitrogen 2-3%, it can be used at low ambient temperatures, without allocation of ice crystals, as well as to increase the fuel storage and the reliability of the first start-up after long-term storage. 1 Il., table 1.

The invention relates to the field of cooking and feeding hydrocarbon fuel entering the gas turbine engine (GTE).

Known method of preparing a liquid fuel for aircraft gas turbine engines, which consists in the fact that the fuel containing dissolved gas, such as air, is introduced into the chamber through the nozzles at a pressure of fuel in the chamber, an underpressure is created by continuous from the camera (see application France 2312279 A1, IPC 7 01 D 19/00, publ. 28,01.1977).

However, this method does not provide the dehydration of liquid fuel that cannot afford to use it at low ambient temperatures, without allocation of ice crystals, which in turn reduces the reliability of the first engine start after long-term storage.

There is also known a method of cooking liquid aviation fuel, which consists in its deoxygenation (removal of oxygen) and carried out using an inert gas, for example nitrogen, while the distillation light ends of the fuel is carried out at reduced pressure (see application France 2310789 A1, IPC 7 01 D 19/00, publ. 14.01.1977 year). However, this method does not provide the dehydration of liquid fuel and does not allow for the same reason to use it at low temperature.

The objective of the invention is to improve the quality of fuel for long term storage of aircraft GTE and its use at low temperatures without producing ice crystals, reduce the reliability of the engine start.

This technical result is achieved due to the fact that in the method of preparation of hydrocarbon fuel for long-term storage of gas turbine engine include a fuel with gaseous nitrogen to produce content in the nitrogen 20...32% vol. excessive pressure on the mirror fuel 0,81.4 bar. with subsequent supply of nitrogen gas through the layer of fuel while evacuating the cavity of the tank above the mirror fuel with primary pressure 100...20 mm RT. senior abs. in the course of 0.9-1 hour. The drawing shows a device implementing this method.

The inventive method is implemented as follows.

Tank 1 capacity of 0.81 m3filled fuel RT GOST 10227-85 at 75-80%. In the cavity above the fuel is nitrogen (TU-6-21-27-77) line 2 with a residual oxygen content of 0.5% vol. and a pressure of 0.8 to 1.4 MPa and maintained at this for 5-6 h with periodic stirring of the fuel pump with a capacity of 3.5-4 m3/h circuit 3. During this period of time the fuel is saturated with nitrogen before the content of dissolved nitrogen 20-32%. The nitrogen content in the fuel determine the chromatographic method according to GOST 22566-77. The method of selection of fuel on the analysis of medical syringe with a volume of 100 ml.

In the tank 1 close line 2 nitrogen supply and open lines 4 nitrogen supply in reservoir performance 12-16 m /h and lines 5 and 6 of the vacuum cavity of the tank above the fuel with the help of ejector high pressure in the atmosphere. The flow of nitrogen into the reservoir 7 with a pressure of 0.8

Analysis of nitrogen and oxygen is produced according to the relevant procedure.

The results of the analyses of the two parties is given in the table.

Bubbles of gaseous nitrogen contribute to the desorption process gases (nitrogen, oxygen) and water vapor from the fuel due to a sharp drop in pressure above the mirror of the fuel, i.e. the process of "cold boiling".

Dissolved in the fuel gaseous substances (nitrogen, oxygen, water vapor) under the action of bubble formations of nitrogen manifold and a low pressure above the mirror fuel are allocated first to nucleate the formation of nitrogen, and then from the tank to the atmosphere. This process of dehydration, obezkislorazhivaniya and degassing the most effective (from experimental data) and allows you to bring the content in fuels to 0.1-0.3% of oxygen, 0,0007-0,009% of water and 2-3% nitrogen and, most significantly, this method allows you to drain the fuel from the dissolved water to a residual quantities of dissolved water, which can safely, i.e. without separating the ice crystals, to operate the fuel system of the CCD at extremely low temperatures (-50o(C) the environment.

The estimated value containing the value is 0,0007-0,0009%. The lower limit of the residual nitrogen content in the fuel at -50oWith approximately 5 vol.%.

Thus, the requirements for toplevelbase equipment GTD for long-term storage at the lowest temperatures (-50oC), this method is carried out completely, in contrast to the known solutions. To compare the effectiveness of this solution the given data by a known method. As indicated above, at -50oWith fuel prepared by a known method, allocated free water in (g) in the form of ice crystals, leading to failure of the fuel equipment GTE, for the most common volume systems in 0.5 l and 5 l, respectively 0.15-0.35 and 1.5-to 3.5.

As can be seen, the amount of released water (0,15-0,35; 1,5-3,5) g is inadmissible and therefore leads to failure.

The amount of released nitrogen in (l) at -50oWith is 0.5(10-5)%=0.025 g; 5(10-5)%=0,25 L.

This amount of excreted nitrogen (0,025-0,25) l in the fuel system is also unacceptable and can lead to failure.

Thus, the effectiveness of this method is that with the lowest cost of nitrogen gas and time for nitriding, t is the fuel dissolved water, oxygen and the simultaneous creation of a vacuum above the mirror fuel, with the purpose of allocation of fuel nitrogen, provides the fuel with the lowest indicators of dissolving in water fuel, oxygen, and nitrogen.

The most significant advantage is the almost complete dehydration of fuel that allows the use of fuel in the fuel system of the CCD at the lowest ambient temperatures without producing ice crystals.

All of the above allows you to completely cancel the operation by freezing fuel and to increase the retention time of the fuel due to the low content of dissolved water and oxygen, as well as to increase the reliability of the first start-up after long-term storage of the CCD due to the minimum amount of dissolved nitrogen.

The effectiveness of the proposed method compared to known is that the proposed method allows to prepare the fuel for all kinds of tests GTD, conservation GTD for long-term storage, and fuel is the lowest dissolved oxygen and nitrogen, and especially water, differs from known methods in the industry and obtained on an industrial scale is vodorodnogo fuel for long term storage gas turbine engine, including mixing it with nitrogen gas and the vacuum cavity above the mirror fuel tank, with a glut of fuel with gaseous nitrogen to produce the content of nitrogen in it 20. . . 32. %, with an excess pressure above the mirror fuel consumption of 0.8 to 1.4 MPa, followed by gaseous nitrogen through the layer of fuel while evacuating the cavity of the tank above the mirror fuel pressure 100. . . 20 mm RT. senior abs. in the course of 0.9. . . 1 h

 

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