JP3699656B2 - Power generation engines on ships - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power generation engine in a ship, and particularly relates to a power generation engine that can be activated by C heavy oil when power is lost.
[0002]
[Prior art]
Ships use C heavy oil as fuel for the power generation engine, and some use C heavy oil when starting up. In this case, C heavy oil is also supplied to the standby machine. However, when the power generation engine is stopped for a long time, the C heavy oil that hardens at room temperature is replaced with A heavy oil that is fluid at normal temperature.
FIG. 2 shows an outline of the power generation engine. 1 is a C heavy oil tank, 2 is an A heavy oil tank, and 3 is a power generation engine.
[0003]
C heavy oil is primarily pressurized from the C heavy oil tank 1 by the fuel oil supply pump 4 and stored in the fuel oil buffer tank 5, and secondarily pressurized from the fuel oil buffer tank 5 by the fuel oil circulation pump 6, It is supplied to the power generation engine 3 through the heater 7.
Reference numeral 8 denotes a fuel injection pump with an engine. When the power generation engine 3 is started, the fuel injection pump 8 is driven in conjunction to inject and supply fuel.
[0004]
In the figure, 9 is an on-off valve provided in the supply pipe, 10 is a pressure regulating valve, 11 is a check valve for supplying C heavy oil, 12 is a check valve for supplying A heavy oil, This is a switching valve provided in the return side pipe.
A degas valve 15 is provided in the fuel oil buffer tank 5, and a degas valve 16 communicates the fuel oil buffer tank 5 and the C heavy oil tank 1 through the degas valve 15. The liquid level of 5 is adjusted to a predetermined level.
[0005]
Since C heavy oil has a high viscosity, it is supplied to the power generation engine 3 after being pressurized and heated to lower the viscosity as described above.
In general, one or two power generation engines 3 are operated, and one is a standby machine. Like the operation machine, the standby engine is also connected by a fuel oil circulation pump 6 to a fuel oil heater 7. Heated C heavy oil is supplied.
[0006]
In this system, when the operating power generation engine 3 is stopped in an emergency and the inboard power supply is lost, the standby power generation engine 3 is started to restore the inboard power supply.
However, since the fuel oil circulation pump 6 stops due to the loss of the inboard power supply, the C heavy oil cannot be supplied.
[0007]
Therefore, for this purpose, the A heavy oil is supplied from the A heavy oil tank 2 installed at a position higher than the power generation engine 3 by its gravity and is started.
However, since the standby machine is also heated by the circulation of C heavy oil at this time, if A heavy oil at normal temperature and normal pressure is supplied to the standby machine, a vapor lock state is caused and the intake of the fuel injection pump 8 in the power generation engine 3 is sucked. The capacity may be reduced and the power generation engine 3 may not be started.
[0008]
[Problems to be solved by the invention]
The present invention has been made to solve such disadvantages of the conventional type, and even when the operating power generation engine is in an emergency stop and power is lost, C heavy oil is supplied to start the standby machine. The purpose is to obtain a power generation engine that can be used.
[0009]
[Means for Solving the Problems]
C fuel oil is supplied from the C fuel oil tank to the fuel oil buffer tank by the fuel supply pump, and C fuel oil stored in the fuel oil buffer tank is supplied to the power generation engine through the fuel oil heater by the fuel oil circulation pump. In the power generation engine, the fuel supply pipe after the fuel oil buffer tank is provided with a bypass pipe that bypasses the fuel oil circulation pump, a check valve is provided in the bypass pipe, and the liquid level of the fuel oil buffer tank is prepared. Therefore, an electromagnetic valve that is closed with no voltage is provided in a gas vent pipe that connects the fuel oil buffer tank and the C heavy oil tank.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the part equivalent to the conventional type shown in FIG. 2, and detailed description is abbreviate | omitted.
A bypass pipe 21 is connected to a fuel supply pipe after the fuel oil buffer tank 5 so as to bypass the fuel oil circulation pump 6.
[0012]
Reference numeral 22 denotes a check valve provided in the bypass pipe 21. When the fuel oil circulation pump 6 stops, C heavy oil in the fuel oil buffer tank 5 is supplied through the check valve 22. . That is, the bypass pipe 21 can bypass the fuel oil circulation pump 6 and supply it to the power generation engine 3.
[0013]
Although the illustrated bypass pipe 21 is connected so as to bypass only the fuel oil circulation pump 6, the fuel oil heater 7 also loses the heating capability at the time of a power failure, so that the pressure loss in the fuel oil heater 7 is lost. In order to prevent this, it is also effective to connect the fuel oil circulation pump 6 and the fuel oil heater 7 so as to bypass them.
[0014]
Reference numeral 23 denotes an electromagnetic valve provided in the gas vent pipe 16, which is normally open (when energized) and is closed when no voltage is applied.
Therefore, when the power supply is lost, the electromagnetic valve 23 is automatically closed and the internal pressure of the fuel oil buffer tank 5 is maintained.
Reference numeral 24 is a check valve provided on the inlet side of the fuel oil buffer tank 5. When the fuel supply pump 4 stops, the internal C heavy oil is changed to C heavy oil by the internal pressure held by the fuel oil buffer tank 5. It does not flow back to the tank 1.
[0015]
The above-described bypass pipe 21, check valve 22, electromagnetic valve 23, and check valve 24 are different from the conventional type, and other configurations are the same as the conventional type.
The C heavy oil in the fuel oil buffer tank 5 is stored by combining the one that is temporarily pressurized by the fuel oil supply pump 4 and the one that circulates through the standby machine. Therefore, compared with the C heavy oil in the C heavy oil tank 1, it is in a heated and pressurized state.
[0016]
Now, the configuration of the power generation engine according to the present invention is as described above. Next, a starting method using heavy fuel oil C when power is lost will be described.
Normally, one or two of the power generation engines 3 are standby machines, but C heavy oil is also supplied to the standby machine from the fuel oil circulation pump 6 through the fuel oil heater 7 in the same manner as the operating machine. . The C heavy oil passes through the standby machine and is returned to the fuel oil buffer tank 5 from the return side pipe.
[0017]
Now, if the driver makes an emergency stop due to some abnormality, the ship's power supply will be lost. When the shipboard power supply is lost, the fuel oil supply pump 4 and the fuel oil circulation pump 6 are stopped. At the same time, the electromagnetic valve 16 is closed with no voltage, and the check valve 24 prevents backflow, so that the fuel oil buffer tank An internal pressure of 5 is maintained.
[0018]
At the same time, the standby machine starts to be activated. The standby machine is automatically activated when the ship's power supply is lost by supplying the air in the ship's piping to the air motor or directly into the cylinder of the standby machine. This activation method is equivalent to the conventional type.
[0019]
When the standby machine is started, the fuel injection pump 8 with the standby machine is operated, and the internal pressure of the supply pipe after the fuel oil circulation pump 6 is lowered. Therefore, the check valve 22 is set by the holding pressure of the fuel oil buffer tank 5. Opened, C heavy oil in the fuel oil buffer tank 5 is sucked through the check valve 22 and supplied to the standby machine.
[0020]
In this way, when the C heavy oil in the fuel oil buffer tank 5 is supplied to the standby machine, the supply of air supplied for starting the standby machine is stopped.
By supplying the C heavy oil in the fuel oil buffer tank 5, the standby machine is in an operating state, the rotation is increased to the rated speed, and the start-up is completed.
[0021]
When the start-up of the standby machine is completed and the onboard power supply is restored, the fuel supply pump 4 and the fuel circulation pump 6 are started, so that fuel supply from the normal C heavy oil tank 1 is performed thereafter.
At this time, the solenoid valve 23 is opened at the same time, and the discharge side piping of the fuel circulation pump 6 becomes high pressure, so that the C heavy oil does not flow through the check valve 22.
[0022]
In this configuration, the fuel oil buffer tank 5 needs to be able to maintain a pressure higher than the required minimum fuel pressure of the standby machine and the saturated vapor pressure of the fuel. The fuel supply pump 4 and the fuel circulation pump 6 are activated, and a capacity that can sufficiently cover the amount of fuel consumed until normal fuel supply can be performed is required.
[0023]
In the present invention, since A heavy oil is used for other predetermined purposes, the check valve 12 and the switching valve 14 in the A heavy oil pipe are normally closed. Therefore, even if the standby machine is activated when the inboard power supply is lost as described above, the heavy oil A does not flow in.
[0024]
【The invention's effect】
The present invention provides a solenoid valve that closes without voltage in the gas vent pipe, maintains the internal pressure of the fuel oil buffer tank when the ship's power supply is lost, and includes a check valve in the fuel supply piping after the fuel oil buffer tank, A bypass pipe that bypasses the fuel circulation pump is provided, and when the standby machine is started when the ship's power source is lost, the C heavy oil in the fuel oil buffer tank is automatically supplied. It became possible to start.
[0025]
In this way, since the standby machine is started with heavy fuel oil C when the inboard power supply is lost, the occurrence of vapor lock is suppressed by the internal pressure of the fuel oil buffer tank, and the standby machine can be started safely and reliably. Became.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an inboard power generation engine according to the present invention.
FIG. 2 is a diagram showing an outline of a conventional inboard power generation engine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 C heavy oil tank 2 A heavy oil tank 3 Power generation engine 4 Fuel oil supply pump 5 Fuel oil buffer tank 6 Fuel oil circulation pump 7 Fuel oil heater 8 Fuel injection pump 9 On-off valve 10 Pressure adjustment valve 11 Check valve 12 Check valve 13 switching valve 14 switching valve 15 degas valve 16 degassing pipe 21 bypass pipe 22 check valve 23 solenoid valve 24 check valve

Claims (1)

C fuel oil is supplied from the C fuel oil tank to the fuel oil buffer tank by the fuel supply pump, and C fuel oil stored in the fuel oil buffer tank is supplied to the power generation engine through the fuel oil heater by the fuel oil circulation pump. In the above-described power generation engine, a bypass pipe for bypassing the fuel oil circulation pump is provided in the fuel supply pipe after the fuel oil buffer tank, a check valve is provided in the bypass pipe, and the liquid level of the fuel oil buffer tank is adjusted. Therefore, a power generation engine in a ship, characterized in that a solenoid valve that is closed with no voltage is provided in a gas vent pipe that connects the fuel oil buffer tank and the C heavy oil tank.

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