Method of motor lifetime increase and fuel consumption decrease on motor ships with gas-turbine boost motors

FIELD: motors and pumps.

SUBSTANCE: invention relates to motor engineering industry, and particularly to gas-turbine boost motors. The method of motor lifetime increase and fuel consumption decrease on motor ships with gas-turbine boost motors is specific by the motor operation set at minor revolutions as compared to the operating revolutions. Simultaneously rotation frequency and exhaust gas temperature are decreased, and travel and disc ratio of propeller screw is increased.

EFFECT: increase of motor lifetime and fuel consumption decrease.

2 cl, 4 tbl

 

Scope

The method can be used to increase engine life and reduce fuel consumption on ships, and other objects with high-speed motors with pressurization operated at high speed or nominee.

The level of technology

Design and manufacture of propellers is based on the fact that all modes of engine operation, which is above the restrictive characteristics, refer to the loading on thermal and mechanical tension [1]. In two-stroke engines and four-stroke with pressurization at a constant average effective pressure (torque) reduction in speed leads to an increase in thermal stress of engine parts (a consequence of the reduction of the air excess factor). [1] For this reason, in engines with pressurization limit average effective pressure (or torque) is not enough to maintain thermal and mechanical tension at partial speed modes on the same level as in the nominal mode. The decrease in the engine speed by reducing the amount of fuel flow causes a decrease in the average effective pressure (or torque) at partial speed modes, which allows you to save heat and mechanism is static tension [1].

Diesels with pressurization, with a high rotational speed at a constant average effective pressure (torque) when the engine load corresponding to the nominal reduction in speed leads to a reduction of thermal stress of the engine parts (a consequence of the increase of the coefficient of excess air) and reducing mechanical loads. For this reason, in engines with pressurization limit average effective pressure (or torque) is enough to reduce thermal and mechanical tension at partial speed modes, when loading the corresponding nominal. Reducing the frequency of rotation of the gas turbine engine supercharged by a certain load leads to an increase in the amount of fuel supply (caused by regulator fuel pump) with respect to the steady-state rotational speed, causing the average effective pressure (or torque) at partial speed modes. Reducing the number of cyclic feed of fuel and the best mixing, due to the increase of the coefficient of excess air, in which the combustion is more complete, you can reduce thermal and mechanical tension.

The prior art known to the ship "Zarya", having engines with pressurization and technical is the cue characteristics, as reflected in Table 1. Also the prior art, the ships brand "Linda", having engines with pressurization and specifications shown in Table 2. These ships were the mass distribution in Russia, but the functional operation of these ships has drawbacks associated with the small engine and large fuel consumption, which arise due to complex reasons, combining high engine speed, high mechanical and thermal loads.

For example, when the turbocharger speed is achieved by the exhaust gases at a temperature of +350°for t/x "dawn" and +450°for t/x "Linda", and charge the air entering the cylinders, loses density due to the relative heat. The resource engine, standing on the vessels m/V "dawn" and "Linda"is 9000 hours, 75% of the engines of the m/V "dawn" and 50% of the engines of the m/V "Linda" produce your resource after two overhauls, when operating with standard screws. Engine load on attachments in these ships is up to 10-15%.

The objective of this invention is to improve the performance of the functioning of ships with high-speed motors with pressurization operated at a higher rotational speed of the sludge is nominal, by reducing speed, mechanical and thermal loads due to the use of the propeller with the modified step and disk.

Technical result achieved when using the method, is to increase engine life and fuel economy.

The invention

The claimed technical result is achieved due to the fact that the way to increase engine life and reduce fuel consumption on the engine with supercharged gas turbine operated at high speed or nominal operation of the engine set at lower revs compared to operating with preservation of other operating parameters, while reducing the rotation speed and temperature of exhaust gases, and the increasing spacing of the propeller disk and relationships.

Diesels with pressurization, with a high rotational speed at a constant average effective pressure (torque) when the engine load corresponding to the nominal reduction in speed leads to a reduction of thermal stress of the engine parts (a consequence of the increase of the coefficient of excess air) and reducing mechanical loads. For this reason, in engines with pressurization limitations in the average effective pressure (or torque) DOS is enough, to reduce thermal and mechanical tension at partial speed modes, when loading, the corresponding nominal. Reducing the frequency of rotation of the gas turbine engine supercharged by a certain load, leads to an increase in the amount of fuel supply (caused by regulator fuel pump) with respect to the steady-state rotational speed, causing the average effective pressure (or torque) at partial speed modes. Reducing the number of cyclic feed of fuel and the best mixing, due to the increase of the coefficient of excess air, in which the combustion is more complete, you can reduce thermal and mechanical tension.

Under the reduction of mechanical load means the engine wear. Reduction in the rate of rotation decreases it.

The method is based on identifying dependencies from lower engine speeds while maintaining operational parameters, with simultaneous reduction of the mechanical load and temperature of exhaust gases, and increase the pitch of the propeller and step relationships.

By experiments (see Tables 1, 3), it was found that in the system of ship operating on the basis of the propeller 4 blades, when performing the design of the propeller of the ship, the diameter of which is 0.696 m, so about what atom, his disk ratio is 1.1, step - 0.640 m, stepper ratio is 0.92, and while maintaining the operating speed of the ship at the level of 32 km/h and operational rotation frequency at the level of 1100 rpm and delivers increased engine life and reducing fuel consumption.

By experiments (see Tables 2, 4), it was found that in the system of ship operating on the basis of the propeller 6 blades, when performing the design of the propeller of the ship, the diameter of which is 0.7 m, so that its disk ratio is 1.35, step - 0.950 m, stepper ratio - 1.35, and while maintaining the operating speed of the ship at the level of 42 km/h and an operational rotation frequency about 1300 rpm, also achieved an increase in engine life and reducing fuel consumption.

Change disc ratio (see Table 1) 1.1 compared to 0.95 for the four - blade propellers, gives an increase of the suction jet pump water, which is due tucked up nozzle creates an increased emphasis (jet pump is an axial pump) (see Table 3).

Step propeller choose 0.640 compared to 0.602 (see Table 1), which allows to increase his focus and ability to maintain operating speed at 1100 rpm, compared to 1350 rpm in the prototype (see Table 3).

Speed 1100 rpm under arrivalsa all-mode regulator fuel pump (fuel pump).

Change disc ratio (see Table 2) at 1.35 compared to 1.45 for the six - bladed propellers, gives the efficiency of the propeller due to the fact that reducing the total area of the blades decreases the water resistance to rotation of the propeller and the engine receives a discharge increase efficiency of the propeller (see Table 4).

Step propeller choose 0.950 compared to 0.890 (see Table 2) for t/x "Linda", which helps increase its focus and ability to maintain operating speed at 1300 rpm, compared to 1500 rpm in the prototype (see Table 4). Speed 1300 rpm is supported by a fully integrated regulator of the injection pump.

Installation of a six-bladed propellers made on ships with high rotational speed of the engine to reduce vibration generated by rotation of the cap screw (for example, four-lobed) with fewer blades above. Therefore, the choice of screw depends on specific tasks related to the operation of the ship. Tests of the method were carried out on the ship "Linda-4". The test results are reflected in the Application. The results showed that the achieved reduction mentioned above rotation frequency and economic impact in the form of lower fuel consumption and engine wear.

Operating speed (see Tables 1 and 2) movement of ships is standard and selected by the company, to operate the tank, to ensure the longest life of the engine.

Comparison of percentage changes in the parameters of Tables 1 and 2 allows us to conclude about the existence of dependence, according to which there is a simultaneous reduction of the mechanical load and temperature of exhaust gases at 10-25%, and the step of the propeller and the stepping ratio increase by 5-8%.

In particular, from a comparison of the changes of the parameters in Tables 1 and 2 shows that the step was increased to 6.31% and 6.74%, respectively, of the stepping ratio was increased by 6.98% and 6.30%, respectively, the temperature drop was 14.29-20% and 18.6%, respectively, reduce the frequency of rotation was 18.52% and 13.33%, respectively. Thus, for these examples the ships "dawn" and "Linda" engine set at lower revs compared to operating with preservation of other operating parameters, while reducing speed on 8.33-23.52% and temperature of exhaust gases at 9.29-25%, and the increase of the step of the propeller at 4.79-8.24% and step relations at 4.8-8.48%.

The dynamics of addiction, reported in Tables 1-4, shows that when you set the engine at lower revs compared to operating parameters with preservation of other operating parameters, while reducing the rotation speed and temperature of exhaust gases and the increase of the step of the propeller disk and relations, achieved an increase in engine life and fuel economy regardless of the engine type with pressurization.

The method eliminates the load of the engine is increased and the nominal rotational speed, when the engine itself loads itself, due to the pressurization, i.e. turbocharger, which in turn forces air into the intake manifold under pressure a bit big. But the air is heated through the temperature of the engine, and loses its density, and therefore in the cylinders is incomplete combustion and high temperature exhaust gases, which leads to thermal load of the engine.

Therefore, to achieve the result according to the way to increase engine life and reduce fuel consumption, ensure that the load of the engine at a lower speed provided by the pump regulator, depending on the application object.

Sources of information

1. "MARINE ENGINES INTERNAL COMBUSTION engines", Yeatman, Aigion, Use, Aiyin, Vasylivna, Vimentine, Alashkar, Publishing house "Shipbuilding", 1989.

Table 1
The elements of the staffing system and the proposed system design, the mapping t/x "DAWN" (operational data on mechanical and thermal load of the engine of the ship M)
Elements, thestaffdeveloped
The diameter D, m0.6960.696
Disk ratio0.951.1
Step N, m0.6020.640
Stepping relation0.860.92
The number of blades44
The number of screws11
Operating speed of the ship, km/h3232
Operational rotation frequency, Rev/min13501100
The temperature of the exhaust gases, °350280-300
Fuel consumption, kg/h125less than 80
Specific fuel consumption, g/kW226145*
* based on the conditions that the effective m is mnost 552 kW saved
Table 2
The elements of the staffing system and the proposed system t/x "LINDA" (operational data on mechanical and thermal load of the engine of the ship M)
Elements, thestaffdeveloped
The diameter D, m0.70.7
Disk ratio1.451.35
Step N, m0.8900.950
Stepping relation1.271.35
The number of blades66
The number of screws11
Operating speed of the ship, km/h4242
Operational rotation frequency, Rev/min15001300
The output time t/x in planing mode, min3 or more0.5-1
The temperature of the exhaust gases, °430350
Fuel consumption, kg/h168135
Specific fuel consumption, g/kW233187*
* based on the conditions that the effective capacity of 722 kW saved

Table 3
Comparative characteristics of the engines of the m/V "dawn" in the standard version of the prototype and the claimed method
The engine t/x "dawn" with a standard propeller screw step - 0.602 m, disc ratio is 0.95The engine t/x "dawn" by the present method with the rowing screw step - 0.640 m, disc attitude - 1.1
Operational engine speed 1350 rpm when the movement of the ship on schedule with a speed of 32 km/hOperating engine speed of 1100 rpm when the movement of the ship on schedule with a speed of 32 km/h
The operating parameters of the engine:The operating parameters of the engine:
water temperature 80°temperaturevida 75°
oil temperature 80°oil temperature 75°
the oil pressure of 7.5 kg/cmoil pressure 7.7 kg/cm
the temperature of the exhaust gases to 350°the temperature of the exhaust gases 300°
Operation of the turbocharger: engine speed is achieved by the exhaust gases with t 350°C, the charge air entering the cylinders, loses density due to the relative heatOperation of the turbocharger: engine speed is achieved by the exhaust gases with t 300°having a higher density effects on hot impeller TC, the charge air entering the cylinders, has a higher density due to the low temperature of exhaust gases, i.e. has a lower relative heat.
Fuel high-pressure pump: frequency cyclic feed of fuel at 1350 rpm corresponds 675, the regulator controls the fuel rail pump in accordance with the load on the propulsionFuel high-pressure pump: frequency cyclic feed of fuel at 1100 rpm corresponds 550, the controller controls the fuel rail pump in accordance with the load on the propeller, which is almost equal to the load with the standard CP propeller at 1350 rpm
Load dvigatelya attachments up to 10-15% Engine load for attachments is significantly reduced
Engine life 9000 hours. Produce 75% of the engines after two renovationsEngine life 9000 hours. The possible development of a resource without major repairs
Fuel savings of more than 10 tons

oil temperature 75°
Table 4
Comparative characteristics of the engines of the m/V "Linda" in the standard version of the prototype and the claimed method
The engine t/x "Linda" with a standard propeller screw step 0.890 m, disc ratio 1.45The engine t/x "Linda" by the present method with the rowing screw step 0.950 m, disc ratio 1.35
Operational engine speed 1500 rpm when the movement of the ship on schedule with a speed of 42 km/hOperational engine speed 1300 rpm when the movement of the ship on schedule with a speed of 42 km/h
The operating parameters of the engine:The operating parameters of the engine:
water temperature 80°the water temperature is 75°
oil temperature 80°
the oil pressure of 7.5 kg/cmoil pressure 7.7 kg/cm
the temperature of the exhaust gases to 450°the temperature of the exhaust gases to 350°
Operation of the turbocharger: engine speed is reached

the exhaust gases with t 450°C, the charge air entering the cylinders, loses density due to the relative heat
Operation of the turbocharger: engine speed is achieved by the exhaust gases with t 350°having a higher density effects on hot impeller TC, the charge air entering the cylinders, has a higher density due to the low temperature of exhaust gases, i.e. has a lower relative heat.
Fuel high-pressure pump: frequency cyclic feed fuel at 1500 rpm corresponds to 750, the regulator controls the fuel rail pump in accordance with the load on the propulsionFuel high-pressure pump: frequency cyclic feed fuel at 1300 rpm corresponds 675, the regulator controls the fuel rail pump in accordance with the load on the propeller, which is almost equal to the load with the standard CP propeller at 1500 rpm
Engine load for attachments up to 10-15% Engine load for attachments is significantly reduced
Engine life 9000 hours. Engines do not produce 50% of the resourceEngine life 9000 hours. The possible development of a resource with one major repairs
Fuel saving up to 10 tons

1. The way to increase engine life and reduce fuel consumption on ships with engines with pressurization, characterized in that the operation of the engine set at lower revs compared to the performance while reducing the rotation speed and temperature of exhaust gases of the engine and increasing step and disk relationship of the propeller.

2. The method according to claim 1, characterized in that the reduction in speed produces 8,33-23,52% and temperature of exhaust gases at 9,29,25% and increase step of the propeller 4.79-8,24% and stepper ratio 4.8-8,48%.



 

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