DK172984B1 - Power plants for ships with electricity generator supplying the ship's grid - Google Patents

Description

The invention relates to a ship propulsion system.

EP Publication No. 0 199 165, published in the 1 priority interval, discloses a system for propelling a ship by means of a piston diesel engine coupled to the ship screw with a utility power gas turbine, the gas supply of which is connected to the piston diesel engine exhaust system and via a reduction gear coupled to a generator, 10 which feeds a ship's net on board the ship. At this plant, the generator is powered by an auxiliary diesel engine and the utility power gas turbine is coupled to a free shaft end of the auxiliary diesel generator unit. in this system the generator speed is controlled by the auxiliary diesel engine.

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EP-A-0 045 843 discloses a method for utilizing the exhaust gas heat energy from an internal combustion engine, in which the heat energy contained in the cooling medium and the exhaust gases for the majority of 20 is changed to electrical energy by means of a steam turbine and a generator synchronous machine. The AC is adapted to the AC consumers using an inverter.

According to the invention, it is the object of a ship propulsion system of the kind mentioned in the preamble to use a speed controlled control device, in which the transfer of the total generator power over the inverter is avoided in order to simplify the system.

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This task is solved according to the invention with the features of the patent claim. Since in the system according to the invention only a very small power for the frequency converter is to be used, the in itself relatively poor efficiency of the frequency converter is not decisive. With the new system, the transmission of the power generator's power to the ship network therefore takes place with an improved efficiency. In addition, the system is simple and inexpensive in its construction. Furthermore, since only a small power is taken from the inverter, the build-up can be used as usual in the market sold, with regard to! 5 for their capacity relatively very small and therefore also very inexpensive structural parts for the frequency converter.

An example of an embodiment of the invention is explained in greater detail in the following description with reference to the drawing, which schematically shows the ship propulsion and ship network supply system.

The system has a drive motor 1 which operates according to the diesel two stroke method and contains several cylinders not shown. The crankshaft of the engine 1 crankshaft is connected at its left end over a clutch 2 to a shaft 3 which carries at its free end a ship screw 4. The drive 1 is provided with an exhaust gas collector 5 which is connected over a conduit 6 with the input of a utility power gas turbine 7. To the exhaust of this 20 turbine 7 is an exhaust pipe 8. The turbine 7 can be bypassed via a bypass line 9 connected between lines 6 and 8, where at the branching point of the bypass line 9 from line 6 there is a shut-off damper 10 for the exhaust gas. The utility power gas turbine 7 is coupled to a shaft 11 during the interconnection of a reduction gear 12 with an electric generator 13 which supplies the electrical power generated in the turbine 7 into a ship's net 14 in the ship. Thus, the unused exhaust energy can be fed into the ship's grid as electrical energy.

The generator 13 includes a speed control device with a static frequency converter 15 and an electric motor 16. The electric motor 16, which is designed as a rotary current motor, is also mechanically coupled to the generator 13 over a shaft 17. The frequency converter is composed in itself as known by 3 DK. 172984 B1 is a rectifier 30 connected to the vessel network 14, a rectifier intermediate circuit 31, and an inverter 32 connected to the rotary motor 16.

5 The frequency converter 15 is used in conjunction with the electric motor 16 for starting and for stepless speed control of the unit composed of the utility power turbine 7 and the generator 13.

The speed control device further includes a measurement sensor 18 and a controller 19 whose input is connected to the measuring sensor and whose output is connected to the DC intermediate circuit 31. The measuring sensor 18 senses the rotation speed of the shaft 17 and sends the measured value to the controller 19. Here it is measured. value compared to a 15 preselected ideal value. By a deviation between the measured value and the ideal value, the rotational speed of the generator 13 is corrected over the frequency converter 15 via its output frequency and thus over the torque motor 16. The measuring sensor 18 can be designed as a tachogen generator.

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Also, a diesel group generator 20 independent of the power supply unit 7, 13 is connected to the ship network 14 and supplies both electrical energy to the ship network 14 as well as the electrical energy needed to start and run the generator 25 13. Thus, the ship network 14 is continuously fed further and in parallel with the generator 13 from at least one diesel generator tractor group 20, which may also consist of another electric power generating unit. Various consumers 21 are connected to the ship network 14 such as pump 30 motors, heating and air conditioning systems, transformers and the like.

The drive motor 1 is in the usual way, not shown here, equipped with a charging unit whose turbine is also actuated with exhaust gas from the exhaust gas collector 5 and thus operates a compressor which compresses the combustion air which is to be supplied to the cylinder of the piston combustion engine 1. Due to an optimized adjustment of the supply to the turbine and compressor, the charger has such a high efficiency that the entire amount of charge air needed and the required air pressure is not used in the area of the upper load 5 of the drive motor 1. standing exhaust gas energy; the excess exhaust gas energy can thus - without increased fuel supply - be utilized for conversion 'to electrical energy.

10 In the lower load range of the drive engine 1 or when reaching the downwardly limited base output of the diesel generator group 20 and by failure in the utility power gas turbine 7, the exhaust gas shut-off valve 10 and the bypass conduit 9 are stopped from the gas supply from the exhaust gas collector 5 to the gas stream 7. exhaust pipe 8.

The system described works as follows: 20 During operation of the drive motor 1 in its upper load range, exhaust gas is supplied from the exhaust gas collector 5 over the conduit 6 to the utility power gas turbine 7, which drives the generator 13 over the reduction gear 12, thereby providing the exhaust gas 25 provided by the drive motor 1. always fully utilized and delivered to the ship network 14 as an electrical power proportion. By means of the diesel generator group 20, the frequency converter 15 and the electric motor 16, the power supply unit 7, 13 is started and driven up to synchronous rotation speed. Over the frequency converter 15, only the frequency of the generator 13 is regulated to a required constant value.

From the diesel generator group 20, both an electric basic power and the after calculation: the basic power of the diesel generator group 20 plus the power output of the generator 13 can be exceeded and required additional electrical power requirements are fed directly into the ship network 14.

Claims (1)

DK 172984 B1 System for propulsion of a ship by means of a piston diesel engine (1) interconnected with the ship screw (4) with a 5 utility power gas turbine (7), the gas supply of which is connected to the piston diesel engine exhaust system and which is connected via a reduction gear (12) a generator (13) supplying a ship network (14) in the ship, characterized in that a frequency controlled device (15, 16, 17, 18, 19) for controlling the frequency of the generator (13) has a frequency converter (15). ) and an electric motor (16) coupled to the generator (13) which is fed from the ship network (14) via the frequency converter (15).