JP2013029111A - Power generation method, turbine power generator, method of controlling turbine power generator, control device, and ship including the turbine power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for controlling of a turbine power generator capable of suppressing generated electric power without wasting fuel of a diesel engine when demand electric power decreases and the generated electric power becomes excessive.SOLUTION: In this turbine power generator obtained by connecting in series a power turbine 7 driven by exhaust energy of exhaust gas exhausted from a diesel engine 3, as a power source, and a steam turbine 9, the diesel engine 3 comprises an exhaust turbo supercharger 5. A portion of the exhaust gas before being supplied to the exhaust turbo supercharger 5 is extracted and the exhaust gas is supplied to the power turbine 7 while adjusting a supply amount. The steam generated by an economizer 11 is supplied to the steam turbine 9 while adjusting a supply amount. When demand electric power decreases and the generated electric power becomes excessive, after the exhaust gas supply amount to the power turbine 7 is reduced to minimize the output of the power turbine 7, the steam supply amount to the steam turbine 9 is reduced.

Description

  The present invention relates to a power turbine (gas turbine) and a steam turbine that are driven by using exhaust energy of exhaust gas (combustion gas) discharged from an engine body constituting a marine diesel engine, a diesel engine for an onshore generator, or the like. The present invention relates to a turbine generator coupled in series, a turbine generator control method and control device, a power generation method, and a ship equipped with the turbine generator.

Patent Document 1 (Japanese Patent Application Laid-Open No. 63-186916) discloses a technique for recovering exhaust energy by directing it to a power turbine or the like without sending a part of the exhaust gas of a diesel engine to a supercharger. Yes.
Patent Document 1 discloses a technique for adjusting the amount of exhaust gas when the exhaust gas enters the power turbine to reduce the amount of change in the amount of exhaust gas sent from the diesel engine to the supercharger. . Further, the amount of exhaust gas entering the power turbine is adjusted by forming a gas turbine inlet with a plurality of passages and providing a bypass valve in each passage.

JP-A-63-186916

  In Patent Document 1, the amount of exhaust gas entering the power turbine is controlled by opening / closing control of a bypass valve. Also, exhaust gas is generated by extracting a part of exhaust gas from a diesel engine, guiding the extracted gas to a power turbine, and introducing steam generated using the exhaust heat of the exhaust gas to a steam turbine. In a recovery system, conventionally, an inlet valve that controls the amount of exhaust gas introduced into a power turbine is generally an ON / OFF on / off valve, and does not have a function of controlling an arbitrary gas amount.

  On the other hand, depending on the operational status of the ship, the total output by the power turbine and the steam turbine may be surplus with respect to the onboard power demand, but the generated output of the power turbine and the steam turbine depends on the output of the diesel engine. Therefore, appropriately taking measures against surplus power is extremely effective for improving the fuel consumption rate of diesel engines.

As a countermeasure against such surplus power, conventionally, a plurality of shaft generators and the like are provided in parallel to selectively control the working generator, to install and consume resistors, and to discard the surplus steam generated. Measures such as reducing the output of the steam turbine have been taken.
However, installing a plurality of shaft generators or the like increases the installation cost, and the release of energy accompanying the adjustment of other surplus power is a waste of diesel engine fuel.

  In view of such problems, the present invention provides a power generation method, a turbine generator, and a turbine that can suppress the generated power without wasting fuel consumption of the diesel engine when the demand power decreases and the generated power becomes surplus. It is an object of the present invention to provide a generator control method and apparatus, and a ship including the turbine generator.

  In order to achieve such an object, a first invention of the present invention is a series connection of a power turbine (gas turbine) and a steam turbine that are driven using exhaust energy of exhaust gas (combustion gas) discharged from a diesel engine as a power source. In the turbine generator control method, the diesel engine includes an exhaust turbocharger, and a part of the exhaust gas (combustion gas) before being supplied to the exhaust turbocharger is extracted, The adjusted exhaust gas is supplied to the power turbine, and the steam generated by the exhaust gas heat exchanger is supplied to the steam turbine by adjusting the supply amount. When the power surplus is reduced, the supply to the power turbine is reduced to minimize the power turbine output, and then the generated power exceeds the demand power. In, wherein the allowed to reduce the supply to the steam turbine.

  A second invention related to an apparatus for carrying out the method for controlling a turbine generator according to the first aspect of the present invention is the control apparatus for a turbine generator, wherein the diesel engine includes an exhaust turbocharger, and the exhaust turbocharger is provided. An extraction passage for extracting a part of the exhaust gas before being supplied to the feeder and supplying the extracted air to the power turbine; an exhaust gas amount adjusting valve provided in the extraction passage for adjusting the supply amount; and an exhaust gas A steam supply passage for supplying steam generated by exchanging heat with exhaust heat of the exhaust gas by the heat exchanger to the steam turbine; a steam amount adjusting valve provided in the steam supply passage for adjusting the supply amount; When the generated power becomes surplus, the exhaust gas amount adjustment valve is throttled to reduce the supply amount to the power turbine to minimize the power turbine output, and then the steam amount adjustment valve is throttled. A controller allowed to reduce the supply to the gas turbine, characterized by comprising a.

  According to the first and second aspects of the present invention, when the generated power is in a surplus state, the exhaust gas turbocharger is used to reduce the output of the power turbine first, that is, by reducing the amount of extracted gas. The amount of exhaust gas to the turbine portion of the machine is increased and pressurized by the compressor portion, the amount of air supplied to the combustion chamber of the diesel engine is increased, the combustion efficiency of the engine is improved, and the fuel consumption rate is improved.

When the output is reduced first from the direction of the steam turbine, the output of the steam turbine must be reduced by discarding (dumping) the steam generated by the exhaust gas heat exchanger.
In this case, the steam generated by the exhaust gas heat exchanger is wasted, which is not preferable for improving the fuel consumption rate of the diesel engine. However, in the present invention, the effect of increasing the supply air pressure is affected. An improvement in combustion efficiency can be obtained effectively.
In addition, since both the power turbine and the steam turbine can perform fast output control, frequency and voltage fluctuations at the time of sudden load fluctuations of the generator can be minimized.

In the first aspect of the invention, preferably, the power that can be supplied by the power turbine and the power that can be supplied by the steam turbine are set in advance, and the power that can be supplied by the steam turbine is minimized after the power that can be supplied by the power turbine is minimized. It is good to decrease. In addition, after the output of the power turbine is reduced and minimized, the supply amount of steam to the steam turbine may be reduced when the generated power exceeds the demand power.
In the second invention, it is preferable that the controller includes a load sharing control unit in which power that can be supplied by a power turbine and power that can be supplied by the steam turbine are set in advance, and a ratio of power that can be supplied is set. Good. In addition, after the output of the power turbine is reduced and minimized, the supply amount of steam to the steam turbine may be reduced when the generated power exceeds the demand power.

According to each configuration, by setting in advance the power that can be supplied by the power turbine and the power that can be supplied by the steam turbine, the output control range by the power turbine can be set in advance, and reliability is improved while improving fuel consumption. A certain amount of surplus power can be suppressed. In addition, since the power generation capacity can be set in advance, it has a degree of freedom in design according to the intended use of the generator.
Further, after the output of the power turbine is reduced and minimized, when the generated power exceeds the demand power, the amount of steam supplied to the steam turbine is reduced, so that the fuel consumption rate is improved.

  In the second aspect of the invention, preferably, the turbine generator is driven by exhaust energy of a diesel engine for ship propulsion, and another diesel engine generator is provided separately from the turbine generator, The load sharing control unit is set with electric power that can be supplied by the power turbine of the turbine generator, electric power that can be supplied by the steam turbine, and electric power that can be supplied by the other diesel engine generators. When the generated power is reduced and surplus, the output of the other diesel engine generator is minimized, then the output of the power turbine is minimized, and finally the output of the steam turbine is minimized. .

  According to such a configuration, when the supplied power is in a surplus state, first, the output of the other diesel engine generator is minimized, and if it is still in a surplus state, the power turbine output of the turbine generator is minimized. Furthermore, in the case of surplus conditions, by minimizing the output of the steam turbine, that is, by reducing the output of the steam turbine as the final step, a diesel engine for ship propulsion when there is excess supply power, and other The fuel consumption rate consumed by the diesel engine generator can be improved.

Next, the third invention relates to a power generation method, a step of driving a diesel engine to discharge exhaust gas, a step of driving a power turbine by exhaust gas discharged from the diesel engine, and the diesel engine In a power generation method comprising a step of introducing steam into the exhaust gas heat exchanger to generate steam and a step of driving a steam turbine with the steam generated by the exhaust gas heat exchanger, the power demand is reduced. Reducing the supply amount of exhaust gas to the power turbine when the generated power becomes surplus, and reducing the output of the power turbine to minimize it, and then supplying the steam to the steam turbine And a step of reducing.
In the third aspect of the invention, preferably, the power that can be supplied by the power turbine and the power that can be supplied by the steam turbine are set in advance, and the power is reduced when the demand power is reduced and the generated power is in a surplus state. A step of reducing the power supplied by the steam turbine after reducing the power supplied by the turbine to a minimum may be provided.
In the third aspect of the invention, preferably, the method further comprises a step of driving another diesel engine generator, and can be supplied by the power turbine, can be supplied by the steam turbine, and can be supplied by the other diesel engine generator. Is set in advance, and when the demand power decreases and the generated power becomes surplus, the power supplied by the other diesel engine generator is reduced and minimized, and then the power supplied by the power turbine is reduced. Reducing and minimizing, and then reducing the power supplied by the steam turbine. Further, after the output of the power turbine is reduced and minimized, the supply amount to the steam turbine may be reduced when the generated power exceeds the demand power.

Next, a fourth invention relates to a turbine generator, and a power turbine (gas turbine) and a steam turbine that are driven by using exhaust energy of exhaust gas (combustion gas) discharged from a diesel engine as a power source in series. In the combined turbine generator, the diesel engine includes an exhaust turbocharger, and extracts a part of the exhaust gas before being supplied to the exhaust turbocharger and supplies the extracted air to the power turbine. A bleed air passage, an exhaust gas amount adjusting valve that is provided in the bleed air passage to adjust a supply amount, and a steam that supplies steam generated by exchanging heat with exhaust heat of the exhaust gas by an exhaust gas heat exchanger to a steam turbine A supply passage, a steam amount adjusting valve provided in the steam supply passage for adjusting the supply amount, and when the generated power becomes surplus due to a decrease in demand power, the exhaust gas A controller that throttles the amount adjustment valve to reduce the amount of exhaust gas supplied to the power turbine to minimize the output of the power turbine, and then restricts the steam amount adjustment valve to reduce the amount of steam supplied to the steam turbine; , Provided.
Preferably, in the fourth aspect of the invention, the controller includes a load sharing control unit in which the power that can be supplied by the power turbine and the power that can be supplied by the steam turbine are set in advance, and a power ratio that can be supplied is set. Good.
Preferably, in the fourth invention, the turbine generator is driven by exhaust energy of exhaust gas from a diesel engine for ship propulsion, and another diesel engine generator is provided separately from the turbine generator, The load sharing control unit of the controller is set with the power that can be supplied by the power turbine of the turbine generator, the power that can be supplied by the steam turbine, and the power that can be supplied by the other diesel engine generator. When the demand power decreases and the generated power becomes surplus, the power supplied by the other diesel engine generator is reduced and minimized, and then the power supplied by the power turbine is reduced and minimized. Next, the power supplied by the steam turbine may be reduced. Further, after the output of the power turbine is reduced and minimized, the supply amount to the steam turbine may be reduced when the generated power exceeds the demand power.

Next, the fifth aspect of the invention relates to a turbine generator as in the fourth aspect of the invention. The fifth aspect of the invention relates to a diesel engine, a power turbine that uses exhaust gas discharged from the diesel engine as a power source, and exhaust from the diesel engine. An exhaust gas heat exchanger that generates steam by exchanging heat with the exhaust gas that is generated, and a turbine generator that is driven by using steam generated by the exhaust gas heat exchanger as a power source, the diesel engine exhausts A turbocharger, an extraction passage for extracting a part of the exhaust gas before being supplied to the exhaust turbocharger and supplying it to the power turbine, and an exhaust gas that is provided in the extraction passage and adjusts the supply amount A steam supply for supplying steam generated by exchanging heat with exhaust gas by the gas amount adjusting valve and the exhaust gas heat exchanger to the steam turbine A steam amount adjusting valve that is provided in the steam supply passage and adjusts the supply amount, and when the generated power becomes surplus due to a decrease in demand power, the exhaust gas amount adjusting valve is throttled to reduce the power turbine A controller for reducing the amount of steam supplied to the steam turbine by reducing the amount of steam supplied to the steam turbine after reducing the amount of exhaust gas supplied to the power turbine to minimize the output of the power turbine. Features.
In the fifth aspect of the invention, preferably, the controller includes a load sharing control unit in which the power that can be supplied by the power turbine and the power that can be supplied by the steam turbine are set in advance, and a power ratio that can be supplied is set. It is good to be done.
Preferably, in the fifth invention, the turbine generator is driven by exhaust energy of exhaust gas from a diesel engine for ship propulsion, and another diesel engine generator is provided separately from the turbine generator, The load sharing control unit of the controller is set with the power that can be supplied by the power turbine of the turbine generator, the power that can be supplied by the steam turbine, and the power that can be supplied by the other diesel engine generator. When the power is reduced and the generated power becomes surplus, the power supplied by the other diesel engine generator is reduced and minimized, and then the power supplied by the power turbine is reduced and minimized. In addition, the power supplied by the steam turbine may be reduced. Further, after the output of the power turbine is reduced and minimized, the supply amount to the steam turbine may be reduced when the generated power exceeds the demand power.
According to the third, fourth, and fifth inventions described above, the same functions and effects as those of the first and second inventions described above can be obtained.

Next, the sixth invention relates to a control device for a turbine generator as in the second invention. Moreover, 7th invention is related with a ship, It is provided with the turbine generator of 4th invention mentioned above, and 5th invention.
According to this 7th invention, the ship which has the effect by the turbine generator of the 4th invention and the 5th invention can be obtained.

  According to the present invention, when the generated power is in a surplus state, the power turbine connected in series with the generator is first reduced, and then the steam turbine output is reduced. As the engine output decreases, the amount of exhaust gas to the turbine part of the exhaust turbocharger of the diesel engine increases, and the combustion efficiency of the diesel engine improves due to the increase in pressurized charge by the exhaust turbocharger. Power generation method, turbine generator, turbine generator control method and apparatus capable of suppressing generation of surplus power without wasting fuel consumption of diesel engine by improving consumption rate, and further provided with turbine generator Ships can be provided.

1 is an overall configuration diagram of a turbine generator according to the present invention. It is a block diagram which shows the whole control apparatus structure of 1st Embodiment. It is a flowchart of a 1st embodiment. It is explanatory drawing which shows the surplus suppression state of the power supply of 1st Embodiment. It is a block diagram which shows the whole control apparatus structure of 2nd Embodiment. It is a flowchart of a 2nd embodiment.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

(First embodiment)
FIG. 1 is an overall configuration diagram of a turbine generator according to the present invention. An example of application to a marine diesel engine will be described.
The turbine generator 1 includes a marine propulsion diesel engine 3, an exhaust turbocharger 5, a power turbine (gas turbine) 7, a steam turbine 9, and an exhaust gas economizer 11 as an exhaust gas heat exchanger. Configured.
The output from the diesel engine 3 is directly or indirectly connected to the screw propeller via the propeller shaft. Further, the exhaust port of the cylinder portion 13 of each cylinder of the diesel engine 3 is connected to an exhaust manifold 15 as an exhaust gas collecting pipe, and the exhaust manifold 15 is a turbine of the exhaust turbocharger 5 via the first exhaust pipe L1. The exhaust manifold 15 is connected to the inlet side of the power turbine 7 via the second exhaust pipe L2 (extraction passage), and a part of the exhaust gas is connected to the exhaust turbocharger. Before being supplied to 5, the air is extracted and supplied to the power turbine 7.

On the other hand, the air supply port of each cylinder part 13 is connected to an air supply manifold 17, and the air supply manifold 17 is connected to the compressor part 5b of the exhaust turbo supercharger 5 via an air supply pipe K1. An air cooler (intercooler) 19 is installed in the supply pipe K1.
The exhaust turbocharger 5 includes a turbine unit 5a, a compressor unit 5b, and a rotating shaft 5c that connects the turbine unit 5a and the compressor unit 5b.

The power turbine 7 is rotationally driven by the exhaust gas extracted from the exhaust manifold 15 via the second exhaust pipe L2, and the steam turbine 9 is supplied with steam generated by the exhaust gas economizer 11. And is driven to rotate.
The exhaust gas economizer 11 includes exhaust gas discharged from the outlet side of the turbine section 5a of the exhaust turbocharger 5 through the third exhaust pipe L3, and from the outlet side of the power turbine 7 through the fourth exhaust pipe L4. The exhaust gas discharged is introduced and the heat exchange unit 21 evaporates the water supplied by the water supply pipe 23 by the heat of the exhaust gas to generate steam. The steam generated by the exhaust gas economizer 11 is introduced into the steam turbine 9 via the first steam pipe J1, and the steam that has finished work in the steam turbine 9 is discharged by the second steam pipe J2 and is not shown. It is led to a condenser (condenser).

  The power turbine 7 and the steam turbine 9 are coupled in series to drive the generator 25. The rotating shaft 29 of the steam turbine 9 is connected to the generator 25 via a speed reducer and a coupling (not shown), and the rotating shaft 27 of the power turbine 7 rotates the steam turbine 9 via a speed reducer and a clutch 31 (not shown). The shaft 29 is connected.

  The second exhaust pipe L2 includes an exhaust gas amount adjusting valve 33 that controls the amount of gas introduced into the power turbine 7, and an emergency stop emergency cutoff valve 35 that shuts off the supply of exhaust gas to the power turbine 7 in an emergency. Is provided. Further, when the emergency stop emergency shut-off valve 35 is shut off, a bypass valve is used to prevent supercharging (supercharging exceeding the optimum operating pressure of the engine) to the turbine section 5a of the exhaust turbocharger 5. 34 is provided between the fourth exhaust pipe L4.

Further, the first steam pipe J1 includes a steam amount adjusting valve 37 that controls the amount of steam introduced into the steam turbine 9, and an emergency stop emergency shut-off valve 39 that shuts off the supply of steam to the steam turbine 9 in an emergency. is set up. The opening amounts of the exhaust gas amount adjusting valve 33 and the steam amount adjusting valve 37 are controlled by a controller 41 described later.
As described above, the generator 25 is driven by the exhaust energy of the exhaust gas (combustion gas) of the diesel engine 3 for ship propulsion, and constitutes an exhaust energy recovery device.

  As shown in FIG. 2, the controller 43 receives a signal from the power sensor 45 that detects the output power of the generator 25, and detects the rotation speed of the rotating shaft 29 of the steam turbine 9 as the rotation speed of the generator 25. A signal from the rotation sensor 49 is input. Further, a signal from the inboard power consumption sensor 51 for detecting the inboard power consumption is input.

The controller 43 includes a load sharing control unit 53, a power turbine governor unit 55, and a steam turbine governor unit 57. The load sharing control unit 53 has power that can be supplied by the power turbine 7 in advance (output sharing ratio). ) Is set to, for example, A (KW), and the power that can be supplied by the steam turbine 9 (output sharing ratio) is set to, for example, B (KW) (see FIG. 4).
Then, a power generation capacity instruction signal corresponding to the sharing ratio set by the load sharing control unit 53 is output to the power turbine governor unit 55 and the steam turbine governor unit 57, respectively.

  The power turbine governor unit 55 is set based on a control function based on a set rotational speed droop control (proportional control) in accordance with a preset output sharing ratio of the power turbine 7 from the load sharing control unit 53. A control signal is calculated based on the deviation from the actual rotational speed detected by the rotation sensor 49 so that the rotational speed fluctuation of the generator 25 is stabilized at the target rotational speed. Then, the control signal is output to the exhaust gas amount adjusting valve 33, the opening degree of the exhaust gas amount adjusting valve 33 is controlled, and the exhaust gas flow rate supplied to the power turbine 7 is controlled. The rotational speed droop control function is a function that calculates a control amount by applying a proportional gain to the deviation between the rotational speed target value and the current rotational speed that is actually controlled.

  Further, in the steam turbine governor unit 57 as well as the power turbine governor unit 55, the rotation set in accordance with the preset output burden ratio of the steam turbine 9 from the load sharing control unit 53. Based on the control function by several droop control (proportional control), control is performed based on the deviation from the actual rotational speed detected by the rotation sensor 49 so that the rotational speed fluctuation of the generator 25 is stabilized at the target rotational speed. A signal is calculated. Then, the control signal is output to the steam amount adjusting valve 37, the opening amount of the steam amount adjusting valve 37 is controlled, and the steam amount supplied to the steam turbine 9 is controlled.

  Next, an output suppression method when the demand power is reduced and the power generated by the generator 25 is in a surplus state will be described based on the flowchart of FIG. 3 and the supplied power explanatory diagram of FIG.

  First, when control is started in step S1, based on the signal from the inboard power consumption sensor 51 and the signal from the power sensor 45 of the generator 25 in step S2, the generated power from the generator 25 reduces the inboard power consumption. It is determined whether or not it is in a surplus state. If so, in step S3, the output of the power turbine 7 is decreased to a minimum.

  Decreasing the output of the power turbine 7 to the minimum includes reducing it to a preset minimum output and also reducing the output of the power turbine 7 to zero. In step S4, it is determined again whether or not the generated power from the generator 25 exceeds the power consumption in the ship and is in a surplus state.

When the output of the power turbine 7 is decreased and minimized, the power turbine 7 may be decreased to the minimum stepwise or continuously, and the determination in step S4 is performed before the minimum value is reached. Of course, it may be minimized while determining whether or not there is.
In order to minimize the output of the power turbine 7, specifically, the opening degree of the exhaust gas amount adjusting valve 33 is adjusted by a signal from the power turbine governor unit 55 provided in the controller 43. Since the rotational speed of the generator 25 and the generated power are in a substantially proportional relationship, in the case of surplus power, the power turbine 7 is set so that the target rotational speed of the generator 25 corresponds to the target generated power based on the power consumption in the ship. Output decreases.

In step S4, when the generated power from the generator 25 exceeds the power consumption in the ship and is in a surplus state, the power turbine 7 has already been reduced to the minimum, so the process proceeds to the next step S5 and the steam turbine 9 The output is decreased and the process ends in step S6.
After the end in step S6, the process returns to step S1 again, and the processing from step S2 is repeated. The repetition is performed at regular time intervals.

  In FIG. 4 showing the suppression state of the supplied power, the output A (KW) of the power turbine (PT) 7 initialized by the load sharing control unit 53 and the output B (KW) of the steam turbine (ST) 9 are Only in the power turbine 7, the output is suppressed and the power is reduced to A−ΔA set as the minimum value.

  According to the first embodiment described above, when the generated power becomes surplus, the controller 43 first reduces the output of the power turbine 7, that is, the amount of exhaust gas extracted from the exhaust manifold 15 is reduced. The amount of exhaust gas to the turbine unit 5a of the exhaust turbocharger 5 increases and is pressurized by the compressor unit 5b to increase the amount of air supplied to the combustion chamber of the diesel engine 3, and the combustion efficiency of the engine And the fuel consumption rate is improved.

When the output is reduced first from the steam turbine 9, the output of the steam turbine 9 must be reduced by discarding (dumping) the steam generated by the exhaust gas economizer 11. In this case, the steam generated by the exhaust gas economizer 11 is wasted, which is not preferable for improving the fuel consumption rate of the diesel engine 3. In the present invention, the combustion efficiency of the engine is effectively improved because it affects the supply pressure to the combustion chamber to be increased.
Further, since both the power turbine 7 and the steam turbine 9 can perform fast output control, frequency and voltage fluctuations during a sudden load fluctuation of the generator 25 can be minimized.

  In addition, by setting in advance the power that can be supplied by the power turbine 7 and the power that can be supplied by the steam turbine 9, the output control range by the power turbine 7 can be set in advance, and reliable surplus power can be improved while improving fuel consumption. Suppression becomes possible. In addition, since the power generation capacity can be set in advance, it has a degree of freedom in design according to the intended use of the generator.

  Furthermore, according to the first embodiment, the output control of the power turbine 7 and the output control of the steam turbine 9 are controlled using the independent power turbine governor portion 55 and the steam turbine governor portion 57, respectively. The output control of the turbine 7 and the output control of the steam turbine 9 can be independently controlled independently of each other, and the output of only the power turbine 7 can be reduced first.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. In the second embodiment, as shown in FIG. 5, the electric power generated by the generator 25 is supplied into the ship, and a plurality of diesel engine generators (other diesel engine generators) 60 installed separately in the ship. Combined with the power from, it is used as an onboard power source.
That is, the generator 25 described in the first embodiment collects and uses the exhaust gas from the marine propulsion diesel engine 3 that is directly or indirectly connected to the screw propeller via the propeller shaft. In the second embodiment, in addition to the generator 25, a diesel engine generator 60 dedicated to power generation is additionally provided.

The load sharing control unit 64 of the controller 62 includes, in advance, power that can be supplied by the power turbine 7 (output sharing ratio), power that can be supplied by the steam turbine 9 (output sharing ratio), and a plurality of diesel engines that are separately installed in the ship. The power that can be supplied by the engine generator 60 (output sharing ratio) is set.
Then, from the load sharing control unit 64, the supplyable power calculated from the set ratio or the set supplyable power is supplied to the power turbine governor unit 55, the steam turbine governor unit 57, and the diesel engine generator 60. Instructs the governor (not shown).

Next, an output suppression method when the power generation output by the generator 25 and the diesel engine generator 60 exceeds the power consumption in the ship and the power generation output is in a surplus state will be described with reference to the flowchart of FIG.
Steps S12 and S13 are added to the flowchart of FIG. 3 of the first embodiment, and steps S14 to S18 are the same as those of the first embodiment.

  First, when control is started in step S11, based on the signal from the inboard power consumption sensor 51, the power signal from the power sensor 45 of the generator 25, and the power signal from the diesel engine generator 60 in step S12, It is determined whether or not the generated power from the generator 25 and the total generated power of the diesel engine generator 60 exceed the power consumption in the ship and are in a surplus state. When exceeding, in step S13, the output of the diesel engine generator (other diesel engine generator) 60 is minimized. Then, in step S14, it is determined again whether or not the total generated power of the generated power from the generator 25 and the generated power from the diesel engine generator 60 exceeds the inboard power consumption and is in a surplus state. If so, the output of the power turbine 7 is minimized in step S15. Step S14 and subsequent steps are the same as in the first embodiment.

  According to the second embodiment, when the supplied power is in the surplus state, first, the output of the diesel engine generator 60 is minimized, and when it is still in the surplus state, the output of the power turbine 7 is minimized, In the surplus state, by minimizing the output of the steam turbine 9, that is, by reducing the output of the steam turbine 9 as a final step, the diesel engine 3 for turbine power generation when the supply power is excessive, The fuel consumption rate consumed by the diesel engine generator 60 can be efficiently improved. About others, it has the same structure and effect as what was demonstrated in the said 1st Embodiment.

  According to the present invention, a power turbine (gas turbine) and steam driven using exhaust energy of exhaust gas (combustion gas) discharged from an engine main body constituting a marine diesel engine, a diesel engine for an onshore generator, or the like. In a turbine generator formed by connecting turbines in series, when the demand power is reduced and the generated power becomes surplus, the generated power can be suppressed without wasting fuel consumption of the diesel engine. It is suitable for use in a control method and apparatus.

1 Turbine generator 3 Diesel engine 5 Exhaust turbocharger 7 Power turbine (gas turbine)
9 Steam turbine 11 Exhaust gas economizer (exhaust gas heat exchanger)
13 Cylinder 15 Exhaust Manifold 17 Supply Manifold 25 Generator 33 Exhaust Gas Amount Adjustment Valve 37 Steam Amount Adjustment Valve 43 Controller 45 Power Sensor 49 Rotation Sensor 51 Inboard Power Consumption Sensor 53 Load Sharing Control Unit 55 Power Turbine Governor Unit 57 Steam Turbine Governor 60 Diesel Engine Generator (Other Diesel Engine Generator)
L1 1st exhaust pipe L2 2nd exhaust pipe (bleeding passage)
L3 Third exhaust pipe L4 Fourth exhaust pipe K1 Supply pipe J1 First steam pipe J2 Second steam pipe

Claims (21)

In a turbine generator control method in which a power turbine (gas turbine) driven by using exhaust energy of exhaust gas (combustion gas) discharged from a diesel engine as a power source and a steam turbine are connected in series,
The diesel engine includes an exhaust turbocharger, extracts a part of exhaust gas (combustion gas) before being supplied to the exhaust turbocharger, and supplies the extracted exhaust gas to the power turbine. The steam generated by the exhaust gas heat exchanger is supplied to the steam turbine by adjusting the supply amount, and when the demand power is reduced and the generated power is in a surplus state, the steam is supplied to the power turbine. A method for controlling a turbine generator, wherein the supply amount to the steam turbine is decreased after the output amount of the power turbine is reduced to minimize the output of the power turbine.   The power that can be supplied by the power turbine and the power that can be supplied by the steam turbine are set in advance, and the power that can be supplied by the power turbine is reduced after the power that can be supplied by the power turbine is minimized. The turbine generator control method described.   3. The supply amount to the steam turbine is reduced when the generated power exceeds the demand power after the output of the power turbine is minimized. 4. Method for controlling a turbine generator. In a control device for a turbine generator formed by connecting a power turbine (gas turbine) and a steam turbine that are driven by using exhaust energy of exhaust gas (combustion gas) discharged from a diesel engine as a power source, in series,
The diesel engine includes an exhaust turbocharger, and extracts a part of exhaust gas before being supplied to the exhaust turbocharger and supplies the extracted air to the power turbine; and An exhaust gas amount adjusting valve provided for adjusting the supply amount, a steam supply passage for supplying steam generated by exchanging heat with exhaust heat of the exhaust gas by an exhaust gas heat exchanger to the steam turbine, and the steam supply passage A steam amount adjusting valve that adjusts the supply amount, and when the demand power decreases and the generated power becomes surplus, the exhaust gas amount adjusting valve is throttled to reduce the supply amount to the power turbine. And a controller for reducing the supply amount to the steam turbine by restricting the steam amount adjusting valve after minimizing the output of the steam generator.   5. The controller is provided with a load sharing control unit in which electric power that can be supplied by a power turbine and electric power that can be supplied by the steam turbine is set in advance, and an electric power ratio that can be supplied is set. The control apparatus of the turbine generator as described.   The turbine generator is driven by exhaust energy of a marine propulsion diesel engine, and another diesel engine generator is provided separately from the turbine generator, and the load sharing control unit of the controller includes the turbine power generation The electric power that can be supplied by the power turbine of the machine, the electric power that can be supplied by the steam turbine, and the electric power that can be supplied by the other diesel engine generator are set. The turbine according to claim 4, wherein the output of the other diesel engine generator is minimized, then the output of the power turbine is minimized, and finally the output of the steam turbine is minimized. Generator control device.   7. The controller according to claim 4, wherein the controller reduces the supply amount to the steam turbine when the generated power exceeds the demand power after the output of the power turbine is minimized. The control apparatus of the turbine generator of Claim 1.   A process of driving a diesel engine to exhaust exhaust gas, a process of driving a power turbine by exhaust gas exhausted from the diesel engine, and generating steam by introducing exhaust gas of the diesel engine into an exhaust gas heat exchanger And a step of driving the steam turbine with steam generated by the exhaust gas heat exchanger, when the demand power is reduced and the generated power becomes a surplus state, the power turbine is supplied to the power turbine. And a step of reducing the amount of steam supplied to the steam turbine after reducing the output of the power turbine to a minimum and then reducing the amount of steam supplied to the steam turbine. .   The power that can be supplied by the power turbine and the power that can be supplied by the steam turbine are set in advance, and when the demand power decreases and the generated power becomes surplus, the power supplied by the power turbine is reduced to the minimum. The power generation method according to claim 8, further comprising a step of reducing the power supplied by the steam turbine after the operation.   The power generation method according to claim 8, further comprising a step of driving another diesel engine generator, the power that can be supplied by the power turbine, the power that can be supplied by the steam turbine, and the power that can be supplied by the other diesel engine generator. Is set in advance, and when the demand power decreases and the generated power becomes surplus, the power supplied by the other diesel engine generator is reduced and minimized, and then the power supplied by the power turbine is reduced. The power generation method according to claim 8, further comprising the step of: minimizing and then reducing the power supplied by the steam turbine.   11. The supply amount to the steam turbine is reduced when the generated power exceeds the demand power after the output of the power turbine is reduced and minimized, and the supply amount to the steam turbine is reduced. The power generation method according to Item 1.   In a turbine generator in which a power turbine (gas turbine) and a steam turbine, which are driven using exhaust energy of exhaust gas (combustion gas) discharged from a diesel engine as a power source, are connected in series, the diesel engine has an exhaust turbocharger. A bleeder passage is provided for extracting a part of the exhaust gas before being supplied to the exhaust turbocharger and supplying the bleed air to the power turbine, and a supply amount is adjusted in the bleed passage. An exhaust gas amount adjusting valve, a steam supply passage for supplying steam generated by exchanging heat with exhaust heat of exhaust gas by an exhaust gas heat exchanger to the steam turbine, and a supply amount being adjusted in the steam supply passage The amount of exhaust gas to be supplied to the power turbine by restricting the exhaust gas amount adjusting valve when the demand power decreases and the generated power becomes surplus After minimizing the output of the power turbine allowed reduced, turbine generator characterized by comprising a controller which allowed to reduce the amount of steam supplied from squeezing the steam amount adjusting valve to the steam turbine.   The controller is provided with a load sharing control unit in which electric power that can be supplied by the power turbine and electric power that can be supplied by the steam turbine is set in advance, and an electric power ratio that can be supplied is set. 12. The turbine generator according to 12.   The turbine generator is driven by the exhaust energy of the exhaust gas of the diesel engine for marine propulsion, and another diesel engine generator is provided separately from the turbine generator, and the load sharing control unit of the controller includes: The power that can be supplied by the power turbine of the turbine generator, the power that can be supplied by the steam turbine, and the power that can be supplied by the other diesel engine generators are set. When surplus conditions occur, the power supplied by the other diesel engine generator is reduced and minimized, then the power supplied by the power turbine is reduced and minimized, and then the power supplied by the steam turbine is reduced. The turbine generator according to claim 12, wherein the turbine generator is reduced.   15. The controller according to claim 12, wherein, after the output of the power turbine is minimized, the controller further reduces the supply amount to the steam turbine when the generated power exceeds the demand power. The turbine generator according to claim 1.   A diesel engine, a power turbine that drives exhaust gas discharged from the diesel engine as a power source, an exhaust gas heat exchanger that generates heat by exchanging heat with the exhaust gas discharged from the diesel engine, and the exhaust In a turbine generator including a steam turbine driven by steam generated by a gas heat exchanger as a power source, the diesel engine includes an exhaust turbocharger and an exhaust gas before being supplied to the exhaust turbocharger. This is generated by exchanging heat with the exhaust gas by the extraction passage for extracting the portion and supplying the extracted power to the power turbine, the exhaust gas amount adjusting valve provided in the extraction passage for adjusting the supply amount, and the exhaust gas heat exchanger. A steam supply passage for supplying the steam to the steam turbine; a steam amount adjusting valve provided in the steam supply passage for adjusting a supply amount; When the required power is reduced and the generated power is in a surplus state, the exhaust gas amount adjusting valve is throttled to reduce the supply amount of exhaust gas to the power turbine to minimize the output of the power turbine. And a controller for reducing the amount of steam supplied to the steam turbine by restricting the steam amount adjusting valve.   The controller is provided with a load sharing control unit in which electric power that can be supplied by the power turbine and electric power that can be supplied by the steam turbine is set in advance, and an electric power ratio that can be supplied is set. The turbine generator according to 16.   The turbine generator is driven by the exhaust energy of the exhaust gas of the diesel engine for marine propulsion, and another diesel engine generator is provided separately from the turbine generator, and the load sharing control unit of the controller includes: The power that can be supplied by the power turbine of the turbine generator, the power that can be supplied by the steam turbine, and the power that can be supplied by the other diesel engine generators are set. When this happens, the power supplied by the other diesel engine generator is reduced and minimized, then the power supplied by the power turbine is reduced and minimized, and then the power supplied by the steam turbine is reduced. The turbine generator according to claim 16, wherein the turbine generator is damped.   19. The controller according to claim 16, wherein, after the output of the power turbine is minimized, the controller reduces the supply amount to the steam turbine when the generated power exceeds the demand power. The turbine generator according to claim 1. 20. A turbine generator control apparatus that controls the operation of the turbine generator by the controller provided in the turbine generator according to claim 16.   A marine vessel comprising the turbine generator according to any one of claims 12 to 19.

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