Heavy Fuel Oil Supply Unit
1. Application of Heavy Fuel Oil Supply Unit
The heavy fuel oil supply unit is used for fuel oil system including land power station and marine main engine, auxiliary engine burning high-viscosity heavy fuel oil.
The heavy fuel oil supply unit is pressure-style fuel oil supply system. It has high thermal efficiency, compact structure, beautiful appearance, and cutting down the shipbuilding period. The unit is provided with semiautomatic back-flushing of filter, automatic viscosity control, automatic pump alternative, automatic exhaust, PLC auto/hand control, automatic error alarm, and so on function. It is the economic perfect equipment for marine fuel oil supply system.
2. Heavy Fuel Oil Supply Unit Working principle
Diesel or heavy oil respectively from the service tank is entered into the oil supply unit, the 3-way switch valve, through the coarse filter before to supply pump, two as spare for oil pump. For oil pump exported equipped with a pressure regulating valve can be adjusted for the pump working pressure and outlet is equipped with pressure controller, pressure gauge to check the oil pump working condition. Fuel after fine filter to filter the flowmeter to mix oil drum, unit filter is installed in parallel of manual and automatic filter, import and export have their respective valve, normal use automatic filter, by-pass filter used for backup.
Mixing barrel with liquid level controller is used to detect mix oil drum level, low level alarm signal to the control box. System of diesel engine oil, hot oil into the mixing barrel, mixes with cold oil for oil pump input, produce oil and gas, by mixing barrel at the top of the automatic exhaust to crude oil service tank, and is equipped with emergency hand exhaust to the bottom of the oil supply unit.
After the fuel mixture degassing in the mixing barrel into the booster pump, two as spare booster pump; Outlet is equipped with pressure controller, pressure gauge to check the oil pump working condition.
After booster pump to the fuel oil heater heating (steam or heat conduction oil heat exchange), heating fuel after a viscometer to measure viscosity, viscosity and viscosity controller feedback signal detection. By electric valve control of heat flow of feed, best viscosity control fuel into the diesel engine fuel injection pump, extra fuel system at the time of the return pipe and oil return back pressure regulating valve back to unit mix oil drum, mixed with oil in the cold mixing barrel and fuel supply pump cycles. System equipped with pressure gauge and relief valve at the exit, display fuel outlet pressure and adjust the fuel pressure into the machine. But above all fuel oil supply unit set oil supply, purification, cyclic heating and complex viscosity/temperature control function.
3. Heating and viscosity control system fault and processing of Heavy Fuel Oil Supply Unit
When the viscosity control failure, firstly according to the "Viscometer daily work instructions" to adjust the standard setting of the value on the control instrument to normal. If the viscosity control cannot use, select temperature control mode.
If viscosity control and temperature control were unable to automatically control the oil temperature, check the electric regulator is whether can work normally, if not work D03 valve is open, use manual control to adjust the heat to stabilize oil temperature, make oil temperature to the normal range.
Note: if three sets of plans are not working, you should check whether the heat input is normal.
4. Troubleshooting of Heavy Fuel Oil Supply Unit
|
Number |
Alarm phenomenon |
Possible reasons |
Elimination method |
|
1 |
Standby power to start the alarm |
Main power loss |
Check the main power power switch |
|
2 |
Oil supply pump electric lose alarm |
Motor protector failure |
Reset or replace protector |
|
3 |
Booster pump electric lose alarm |
Motor protector failure |
Reset or replace protector |
|
4 |
Standby oil supply pump start alarm |
(1)Motor protector failure (2)Oil supply pressure controller failure |
(1)Reset or replace protector/contactor (2)Change pressure controller |
|
5 |
Standby booster pump start alarm
|
(1)Main booster pump lost electricity (2)Booster pump pressure controller failure |
(1)Reset or replace protector/contactor (2)Change of pressure controller
|
|
6 |
Ultra high temperature alarm
|
(1)Actual temperature is higher than the set temperature above 10 ℃ in temperature panel (2)Pressure type temperature controller failure (3)Temperature instrument failure |
(1)Check the pressure type temperature control or replacement (2)Check the temperature gauge or replacement
|
|
7 |
Filter blocking alarm
|
(1)Differential pressure between before and after the filter too high caused by filter blocking, filter impurities can't automatic discharge (2)Filter differential pressure controller failure |
(1)Manual removal filter cleaning (2)Change the filter pressure controller
|
|
8 |
low level warning
|
(1)Exhaust berry oil level below the float (2)Liquid level floating ball stuck or damage |
(1)Check whether liquid level float impurities stuck or replacement (2)Exhaust berry oil level higher
|
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