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New Products
1. Yasec Thermolator
It embodies a new technology to manage the temperature and injection viscosity of fuel oil fed to the diesel engine.
1) It performs programmed feeding of fuel oil to the engine according to its power output, switched from M.D.O. to blended oil (0 to 100% H.F.O.) and further to H.F.O.
2) You have only to set on the controller the viscosity of the H.F.O. that is used. The system will compute, from the blend ratio of the fuel oil currently supplied to the engine (0 to 100% H.F.O.), the heating temperature for the fuel oil matching the proper viscosity for injection into the engine, and automatically control the heating temperature and accordingly the viscosity of the fuel oil.
3) Controls described in 1) and 2) make it possible to switch the fuel oil and regulate its viscosity, both automatically, without needing any manipulation by the engineer. Thus, full automation of fuel oil feed is achieved.
4) The thermolator of course has excellent functions and resolution as an inline blender. A unit of it is operating with no trouble whatsoever aboard the sail ship Kaio Maru of the Institute for Sea Training. Even though the future of available fuel oil involves uncertain factors, a ship equipped with a thermolator having inline functions will be free from worry.
It can also help address the SOx problem because oil blending can be used for adjusting the sulfur content.
Blend ratio indicator
2. Operating Principles
1) Operating Principle as Inline Blender
Usually, M.D.O. is kept at normal temperature, and H.F.O. is heated to 80℃ or above. Here is a temperature difference, accordingly.
By mixing 100 cc of 90℃ hot water and 100 cc of 10℃ cold water, you will get 200 cc of 50℃ of warm water. This simple arithmetic is applied to oil blending.
If you need blended oil in which H.F.O. of 80℃ and M.D.O. of 40℃ are mixed in a 50:50 ratio, you can mix them to get the in-between temperature of 60℃, and this will be the 50:50 blended oil you need.
Each of the H.F.O. inlet and the M.D.O. inlet has a temperature sensor, which measures the temperature on a real time basis. The temperature at which the blended oil can achieve the set blend ratio is computed from the readings of these sensors, and the two kinds of oil are blended to that temperature and fed from the automatic mixing valve unit of the thermolator. The supplied oil will be the desired blend, which is fed to the engine as it is.
If the temperature at the blended oil outlet of the automatic mixing valve unit of the thermolator is the same as that at the M.D.O. inlet, 100% M.D.O. will be supplied or, if it is the same as the temperature at the H.F.O. inlet, 100% H.F.O. will be supplied.
* The principle according to which usual H.F.O. enters the fuel oil circulation line is exactly the principle of the line into which the necessary quantity of H.F.O. enters by its own weight according to the difference between the liquid surface level in the air separator and that in the H.F.O. service tank. The required piping is very simple, no more complex than any usual piping. The system can obviously be adapted to a pressurized fuel feed line.
| Pumps, strainers, valves and so forth are not illustrated in this drawing. |
2) Programmed Control
If supplied with current signals of 4 to 20 mA (including rack signals and air suction pressure signals), the system can perform the following programming.
At a load of X or below, 100% M.D.O. is fed to the engine. At a load of Y or above, fuel oil of a blend ratio (0 to 100%) set in the controller is supplied. Between the load levels of X and Y, blended oil is fed. The blend ratio varies proportionally.
3) Automatic Viscosity Control Device
The thermolater can know the current blend ratio from the fuel oil temperatures at the outlet and inlet of the mixing valve unit. These temperatures are converted into electrical signals, which are inputted to an automatic viscosity control device.
For the automatic viscosity control device, the viscosity of the H.F.O. in use is set by dialing on the controller face. The viscosity of M.D.O. is internally set (because it does not vary).
Then, the fuel injection viscosities of 60-70-80 seconds are set to the levels specified by the engine builder.
From the viscosities of H.F.O. and of M.D.O. and from the oil blend ratio signal supplied from the thermolater, it is computed what temperature should be reached by heating to achieve the appropriate injection viscosity for the engine, and the engine fuel oil heater is so controlled as to obtain that temperature.
Example of Fuel Oil Heating Program Based on Blend Ratio:
Where Appropriate Fuel Injection Viscosity is 60 Secs
The Yacec thermolator performs control by linking all the principles explained in 1) through 3) above.
The fuel oil feed is automatically switched without needing manipulation by the engineer to the type of oil matching the engine output level, and the fuel viscosity is automatically regulated consistently. Whereas an increasing number of “M0” vessels come into service, thermolator-equipped vessels can be operated without having to awaken the engineer when they enter into a narrow channel or strait or have to slow down in a dense fog.
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